114 results on '"Khan NZ"'
Search Results
2. Analysis of the lubrication approximation theory in the calendering/sheeting process of upper convected Jeffery's material.
- Author
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Zahid, M, Khan, NZ, Siddiqui, AM, Iqbal, S, Muhammad, A, and Tlili, Iskander
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- *
APPROXIMATION theory , *LUBRICATION & lubricants , *GRAPH theory , *PARAMETER estimation , *VELOCITY measurements - Abstract
This paper analyses an isothermal calendering for an upper convected Jeffery's Material. Lubrication Approximation Theory (LAT) is applied to simplify the flow equations. Analytical solutions of velocity, flow rate, and pressure gradient are carried out. Outcomes of sheet thickness, detachment point, roll separating force, power input to the roll, and pressure distribution are obtained. The effects of some involved parameters are displayed through graphs and tables. It is noted that the material parameter is a controlling device for sheet thickness, flow rate, detachment point, roll separating force, power input, and the pressure distribution. We observed that as the material parameter increases, the detachment point increases which results in increased sheet thickness. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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3. Effect of a time dependent stenosis on flow of a second order fluid through constricted tube with velocity slip at wall using integral method
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Rana, MA, primary, Siddiqui, AM, additional, and Khan, NZ, additional
- Published
- 2018
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4. Responses of circulating fish phagocytes to paper mill effluent exposure
- Author
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Mohammad Athar, Khan Nz, M. Fatima, Iqbal Ahmad, and Sheikh Raisuddin
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Male ,Paper ,Phagocyte ,Health, Toxicology and Mutagenesis ,India ,Toxicology ,Industrial waste water ,Heteropneustes fossilis ,medicine ,Animals ,Industry ,Effluent ,Catfishes ,Phagocytes ,biology ,Chemistry ,business.industry ,Paper mill ,General Medicine ,Pulp and paper industry ,biology.organism_classification ,Pollution ,medicine.anatomical_structure ,%22">Fish ,Female ,business ,Water Pollutants, Chemical - Published
- 1998
5. GLOBAL HEALTLH PRIORITIES AND THE PREVENTION OF NEURODEVELOPMENTAL DISABILITIES
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Durkin, MS, primary and Khan, NZ, additional
- Published
- 2006
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6. Best resource use for disabled children.
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Khan NZ
- Published
- 1998
7. Validation of rapid neurodevelopmental assessment instrument for under-two-year-old children in Bangladesh.
- Author
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Khan NZ, Muslima H, Begum D, Shilpi AB, Akhter S, Bilkis K, Begum N, Parveen M, Ferdous S, Morshed R, Batra M, and Darmstadt GL
- Abstract
OBJECTIVE: The objective of this study was to determine the reliability and validity of a comprehensive assessment procedure for ascertaining neurodevelopmental status of children aged 0 to 24 months for use by multidisciplinary professionals in a developing country. METHODS: We developed the Rapid Neurodevelopmental Assessment (RNDA) to determine functional status in the following domains: primitive reflexes, gross motor, fine motor, vision, hearing, speech, cognition, behavior, and seizures. Reliability was determined for 50 children who were aged <3 months and 30 children who were aged >/=3 to 24 months and were administered the RNDA by 8 different professionals (3 physicians, 4 therapists, and 1 special teacher). Validity was determined on 34 children aged <3 months in hospital and 81 children aged >/=3 to 24 months in urban (n = 47) and rural (n = 34) community-based populations by any 1 of the 8 professionals, with simultaneous administration of the adapted Bayley Scales of Infant Development II by a psychologist as the gold standard. RESULTS: Mean kappa coefficients of agreement among professionals in overall and individual domains in the 2 age groups ranged from good to excellent. For both younger and older children, there was good concurrent validity (ie, significantly lower mean Mental Development Index and Psychomotor Development Index scores) for children with >/=1 neurodevelopmental impairment and for children with impairments in most functional domains, compared with children with no impairments. Significantly more impairments were found in children from disadvantaged compared with socioeconomically more advantaged communities, indicating good discriminant validity. CONCLUSIONS: The RNDA can be used by professionals from a range of backgrounds with high reliability and validity for determining functional status of children who are younger than 2 years. The study findings have important practical implications for early identification and intervention to mitigate neurodevelopmental impairments in large populations that live in developing countries where professional expertise is sparse. [ABSTRACT FROM AUTHOR]
- Published
- 2010
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8. Effectiveness of Table Salt (NaCl) in the Treatment of Umbilical Granuloma at Household Level.
- Author
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Mahmud AA, Uddin MB, Khan NZ, Islam S, Bari MS, Ali MS, Nag UK, Islam MA, Hasan A, and Khan MA
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- Humans, Female, Male, Prospective Studies, Sodium Chloride therapeutic use, Bangladesh, Infant, Treatment Outcome, Child, Preschool, Umbilicus, Granuloma drug therapy
- Abstract
Umbilical granuloma may be defined as a small mass of granulation tissue which develops at the base of the umbilicus after separation of the cord. It consists of true granulation tissue with fibroblast and abundant capillaries. Treatment options are chemical cauterization, electro cauterization and sometimes need surgical excision. Aims of this study were to develop a simple and feasible method for the treatment of umbilical granuloma with table salt (NaCl). This was a multi-center prospective type of observational study and conducted from January 2023 to March 2024 in the department of Pediatrics Surgery, Mymensingh Medical College Hospital, Mymensingh and other Private Hospitals of Mymensingh, Bangladesh. Total 66 patients were included among them 59(89.09%) cured and 7(10.6%) patients need other options. No complications and recurrence was seen in 3 months follow up. Treatment of umbilical granuloma with table salt (NaCl) is a simple, effective, low cost and feasible method.
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- 2024
9. Spinal cord injury disrupts plasma extracellular vesicles cargoes leading to neuroinflammation in the brain and neurological dysfunction in aged male mice.
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Lei Z, Krishnamachary B, Khan NZ, Ji Y, Li Y, Li H, Brunner K, Faden AI, Jones JW, and Wu J
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- Animals, Male, Mice, Mice, Inbred C57BL, MicroRNAs metabolism, Cytokines metabolism, Cytokines blood, Neurons metabolism, Inflammation metabolism, Extracellular Vesicles metabolism, Neuroinflammatory Diseases metabolism, Spinal Cord Injuries metabolism, Brain metabolism, Aging metabolism
- Abstract
Aged individuals with spinal cord injury (SCI) are prevalent with increased mortality and worse outcomes. SCI can cause secondary brain neuroinflammation and neurodegeneration. However, the mechanisms contributing to SCI-induced brain dysfunction are poorly understood. Cell-to-cell signaling through extracellular vesicles (EVs) has emerged as a critical mediator of neuroinflammation, including at a distance through circulation. We have previously shown that SCI in young adult (YA) male mice leads to robust changes in plasma EV count and microRNAs (miRs) content. Here, our goal was to investigate the impact of old age on EVs and brain after SCI. At 24 h post-injury, there was no difference in particle count or size distribution between YA and aged mice. However, aged animals increased expression of EV marker CD63 with SCI. Using the Fireplex® miRs assay, Proteomics, and mass spectrometry-based Lipidomics, circulating EVs analysis identified distinct profiles of miRs, proteins, and lipid components in old and injury animals. In vitro, plasma EVs from aged SCI mice, at a lower concentration comparable to those of YA SCI mice, induced the secretion of pro-inflammatory cytokines and neuronal apoptosis. Systemic administration of plasma EVs from SCI animals was sufficient to impair general physical function and neurological function in intact animals, which is associated with pro-inflammatory changes in the brain. Furthermore, plasma EVs from young animals had rejuvenating effects on naïve aged mice. Collectively, these studies identify the critical changes in circulating EVs cargoes after SCI and in aged animals and support a potential EV-mediated mechanism for SCI-induced brain changes., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 The Authors. Published by Elsevier Inc. All rights reserved.)
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- 2024
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10. Interaction of high-fat diet and brain trauma alters adipose tissue macrophages and brain microglia associated with exacerbated cognitive dysfunction.
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Henry RJ, Barrett JP, Vaida M, Khan NZ, Makarevich O, Ritzel RM, Faden AI, and Stoica BA
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- Animals, Male, Mice, Adipose Tissue metabolism, Adipose Tissue pathology, Recognition, Psychology physiology, Obesity pathology, Obesity complications, Maze Learning physiology, Diet, High-Fat adverse effects, Microglia metabolism, Microglia pathology, Cognitive Dysfunction etiology, Cognitive Dysfunction pathology, Cognitive Dysfunction metabolism, Mice, Inbred C57BL, Macrophages metabolism, Macrophages pathology, Brain Injuries, Traumatic pathology, Brain Injuries, Traumatic metabolism, Brain pathology, Brain metabolism
- Abstract
Obesity increases the morbidity and mortality of traumatic brain injury (TBI). Detailed analyses of transcriptomic changes in the brain and adipose tissue were performed to elucidate the interactive effects between high-fat diet-induced obesity (DIO) and TBI. Adult male mice were fed a high-fat diet (HFD) for 12 weeks prior to experimental TBI and continuing after injury. High-throughput transcriptomic analysis using Nanostring panels of the total visceral adipose tissue (VAT) and cellular components in the brain, followed by unsupervised clustering, principal component analysis, and IPA pathway analysis were used to determine shifts in gene expression patterns and molecular pathway activity. Cellular populations in the cortex and hippocampus, as well as in VAT, during the chronic phase after combined TBI-HFD showed amplification of central and peripheral microglia/macrophage responses, including superadditive changes in selected gene expression signatures and pathways. Furthermore, combined TBI and HFD caused additive dysfunction in Y-Maze, Novel Object Recognition (NOR), and Morris water maze (MWM) cognitive function tests. These novel data suggest that HFD-induced obesity and TBI can independently prime and support the development of altered states in brain microglia and VAT, including the disease-associated microglia/macrophage (DAM) phenotype observed in neurodegenerative disorders. The interaction between HFD and TBI promotes a shift toward chronic reactive microglia/macrophage transcriptomic signatures and associated pro-inflammatory disease-altered states that may, in part, underlie the exacerbation of cognitive deficits. Thus, targeting of HFD-induced reactive cellular phenotypes, including in peripheral adipose tissue immune cell populations, may serve to reduce microglial maladaptive states after TBI, attenuating post-traumatic neurodegeneration and neurological dysfunction., (© 2024. The Author(s).)
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- 2024
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11. Efficacy of Early Intervention for Infants With Cerebral Palsy in an LMIC: An RCT.
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Benfer KA, Whittingham K, Ware RS, Ghosh AK, Chowdhury S, Moula G, Samanta S, Khan NZ, Bell KL, Oftedal S, Bandaranayake S, Salt AT, Bhattacharya A, Maiti P, Tripathi SK, Morgan C, Novak I, and Boyd RN
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- Child, Humans, Infant, Male, Caregivers, Developing Countries, Movement, Single-Blind Method, Cerebral Palsy therapy
- Abstract
Objective: To test efficacy of a parent-delivered multidomain early intervention (Learning through Everyday Activities with Parents [LEAP-CP]) for infants with cerebral palsy (CP) compared with equal-dose of health advice (HA), on (1) infant development; and (2) caregiver mental health. It was hypothesized that infants receiving LEAP-CP would have better motor function, and caregivers better mental health., Methods: This was a multisite single-blind randomized control trial of infants aged 12 to 40 weeks corrected age (CA) at risk for CP (General Movements or Hammersmith Infant Neurologic Examination). Both LEAP-CP and HA groups received 15 fortnightly home-visits by a peer trainer. LEAP-CP is a multidomain active goal-directed intervention. HA is based on Key Family Practices, World Health Organization. Primary outcomes: (1) infants at 18 months CA: Pediatric Evaluation of Disability Inventory-Computer Adaptive Test (PEDI-CAT mobility); and (2) caregiver: Depression Anxiety and Stress Scale., Results: Of eligible infants, 153 of 165 (92.7%) were recruited (86 males, mean age 7.1±2.7 months CA, Gross Motor Function Classification System at 18 m CA: I = 12, II = 25, III = 9, IV = 18, V = 32). Final data were available for 118 (77.1%). Primary (PEDI-CAT mobility mean difference = 0.8 (95% CI -1.9 to 3.6) P = .54) and secondary outcomes were similar between-groups. Modified-Intention-To-Treat analysis on n = 96 infants with confirmed CP showed Gross Motor Function Classification System I and IIs allocated to LEAP-CP had significantly better scores on PEDI-CAT mobility domain (mean difference 4.0 (95% CI = 1.4 to 6.5), P = .003) compared with HA., Conclusions: Although there was no overall effect of LEAP-CP compared with dose-matched HA, LEAP-CP lead to superior improvements in motor skills in ambulant children with CP, consistent with what is known about targeted goal-directed training., (Copyright © 2024 by the American Academy of Pediatrics.)
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- 2024
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12. Risk Factors for Unexpected Admission Following Lumbar Spine Laminectomy: A National Database Study.
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Tarazi JM, Koutsogiannis P, Humphrey EK, Khan NZ, Katsigiorgis M, Katsigiorgis G, and Cohn RM
- Abstract
Introduction Laminectomy is one of the most common orthopedic spine surgeries performed in the United States. Compared to other spine operations such as fusions, laminectomies in isolation are of lower morbidity. However, complications may arise that result in readmission to an inpatient healthcare facility. The purpose of this study is to identify the demographics and risk factors associated with unplanned 30-day readmission following a laminectomy. Methods The American College of Surgeons National Surgical Quality Improvement Program (ACS-NSQIP) database was queried for patients who underwent a laminectomy procedure from 2015 to 2019 using CPT code 63030. This query yielded 61,708 cases. Demographic, lifestyle, comorbidity, and peri-operative factors were recorded. Independent samples Student's t -tests, chi-squared, and, where appropriate, Fisher's exact tests were used in univariate analyses to identify demographic, lifestyle, and peri-operative variables related to 30-day readmission following a laminectomy procedure. Multivariate logistic regression modeling was subsequently performed. Odds ratios (ORs) with 95% confidence intervals (CIs) were calculated and reported. Results Of the 61,708 patients included in our sample, 2,359 were readmitted within 30 days of surgery, corresponding to a readmission rate of 3.82%. Results of the univariate analysis revealed statistically significant relationships between readmission status and the following patient variables: patient age, sex, BMI, ASA classification, race, bleeding disorder, chronic obstructive pulmonary disease (COPD), diabetes, hypertension, congestive heart failure (CHF), chronic steroid use, total operative time, and tobacco use (p < 0.05). Multivariate logistic regression modeling confirmed that the following patient variables were associated with statistically significantly increased odds of readmission: age greater than 65 (p < 0.05), female sex (p = 0.013), bleeding disorder (p = 0.011), diabetes (p = 0.006), current smoker (p = 0.010), COPD (p < 0.001), steroid use (p = 0.006), ASA Class II or above (p < 0.05), and total operative time (p < 0.001). Conclusion Unplanned 30-day readmission after laminectomy is infrequent. However, increasing age, female sex, steroid use, current smokers, bleeding disorders, diabetes, COPD, CHF, a higher ASA classification, and longer operative times are independent risk factors for readmission following laminectomy., Competing Interests: The authors have declared that no competing interests exist., (Copyright © 2024, Tarazi et al.)
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- 2024
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13. The Binding of the SARS-CoV-2 Spike Protein to Platelet Factor 4: A Proposed Mechanism for the Generation of Pathogenic Antibodies.
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Nguyen TH, Chen LY, Khan NZ, Lindenbauer A, Bui VC, Zipfel PF, and Heinrich D
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- Humans, Antibodies, Monoclonal, Humanized, Immunologic Factors, Platelet Factor 4 chemistry, Platelet Factor 4 metabolism, SARS-CoV-2 metabolism, Spike Glycoprotein, Coronavirus, COVID-19, Thrombocytopenia
- Abstract
Pathogenic platelet factor 4 (PF4) antibodies contributed to the abnormal coagulation profiles in COVID-19 and vaccinated patients. However, the mechanism of what triggers the body to produce these antibodies has not yet been clarified. Similar patterns and many comparable features between the COVID-19 virus and heparin-induced thrombocytopenia (HIT) have been reported. Previously, we identified a new mechanism of autoimmunity in HIT in which PF4-antibodies self-clustered PF4 and exposed binding epitopes for other pathogenic PF4/eparin antibodies. Here, we first proved that the SARS-CoV-2 spike protein (SP) also binds to PF4. The binding was evidenced by the increase in mass and optical intensity as observed through quartz crystal microbalance and immunosorbent assay, while the switching of the surface zeta potential caused by protein interactions and binding affinity of PF4-SP were evaluated by dynamic light scattering and isothermal spectral shift analysis. Based on our results, we proposed a mechanism for the generation of PF4 antibodies in COVID-19 patients. We further validated the changes in zeta potential and interaction affinity between PF4 and SP and found that their binding mechanism differs from ACE2-SP binding. Importantly, the PF4/SP complexes facilitate the binding of anti-PF4/Heparin antibodies. Our findings offer a fresh perspective on PF4 engagement with the SARS-CoV-2 SP, illuminating the role of PF4/SP complexes in severe thrombotic events.
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- 2024
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14. Health and socioeconomic resource provision for older people in South Asian countries: Bangladesh, India, Nepal, Pakistan and Sri Lanka evidence from NEESAMA.
- Author
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Matthews NR, Porter GJ, Varghese M, Sapkota N, Khan MM, Lukose A, Paddick SM, Dissanayake M, Khan NZ, and Walker R
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- Humans, Aged, Pakistan, Bangladesh, Sri Lanka, Nepal, India, Socioeconomic Factors, South Asian People
- Abstract
Background: The global population is ageing rapidly, with low- and middle-income countries (LMICs) undergoing a fast demographic transition. As the number of older adults in LMICs increases, services able to effectively address their physical and mental health needs will be increasingly important., Objective: We review the health and socioeconomic resources currently available for older people in South Asian countries, Bangladesh, India, Nepal, Pakistan and Sri Lanka, to identify gaps in available resources and assess areas for improvement., Methods: We conducted a search of grey and published literature via Google Search, Compendex, EBSCO, JSTOR, Medline, Ovid, ProQuest databases, Scopus and Web of Science. Data on population demographics, human resources, health funding and social protection for older people were extracted. Local informants were consulted to supplement and verify the data., Results: In the study countries, the number of health professionals with expertise in elderly care was largely unknown, with minimal postgraduate training programmes available in elderly medicine or psychiatry. Older adults are therefore cared for by general physicians, nurses and community health workers, all of whom are present in insufficient numbers per capita. Total average healthcare expenditure was 2.5-5.5% of GDP, with 48.1-72.0% of healthcare costs covered by out-of-pocket payments. Pakistan did not have a social pension; only India and Nepal offered financial assistance to people with dementia; and all countries had disproportionately low numbers of care elderly homes., Conclusions: Inadequate healthcare funding, a shortage of healthcare professionals and insufficient government pension and social security schemes are significant barriers to achieving universal health coverage in LMICs. Governing bodies must expand training programmes for healthcare providers for older adults, alongside increasing social protection to improve access to those in need and to prevent catastrophic health expenditure.
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- 2023
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15. The developments of cyan emitting phosphors to fulfill the cyan emission gap of white-LEDs.
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Khan NZ, Khan SA, Chen W, Padhiar MA, Abbas MT, Ullah Z, Runowski M, Xu X, and Zheng RK
- Abstract
Future generations of solid-state lighting (SSL) will prioritize the development of innovative luminescent materials with superior characteristics. The phosphors converted into white light-emitting diodes (white LEDs) often have a blue-green cavity. Cyan-emitting phosphor fills the spectral gap and produces "full-visible-spectrum lighting." Full-visible spectrum lighting is beneficial for several purposes, such as light therapy, plant growth, and promoting an active and healthy lifestyle. The design of cyan garnet-type phosphors, like Ca
2 LuHf2 Al3 O12 (CLHAO), has recently been the subject of interest. This review study reports a useful cyan-emitting phosphor based on CLHAO composition with a garnet structure to have a cyan-to-green emitting color with good energy transfer. It could be employed as cyan filler in warm-white LED manufacturing. Due to its stability, ability to dope with various ions suitable for their desired qualities, and ease of synthesis, this garnet-like compound is a great host material for rare-earth ions. The development of CLHAO cyan-emitting phosphors has exceptionally high luminescence, resulting in high CRI and warm-white LEDs, making them a viable desire for LED manufacturing. The development of CLHAO cyan-emitting phosphors with diverse synthesis techniques, along with their properties and applications in white LEDs, are extensively covered in this review paper., Competing Interests: The authors declare that this study received funding from China National Petroleum Corporation. The funder had the following involvement in the study: Conceptualization, Data curation, Funding acquisition, Investigation, Methodology, Project administration, Writing – review & editing. The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2023 Khan, Khan, Chen, Padhiar, Abbas, Ullah, Runowski, Xu and Zheng.)- Published
- 2023
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16. Heterologous expression of bacterial dehydrin gene in Arabidopsis thaliana promotes abiotic stress tolerance.
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Khan NZ, Ali A, Ali W, Aasim M, Khan T, Khan Z, and Munir I
- Abstract
Salinity, low temperature, and drought are major environmental factors in agriculture leading to reduced crop yield. Dehydrins (DHNs) are induced transcriptionally during cellular dehydration and accumulate in different tissues during abiotic stresses. Here we isolated and characterized a bacterial gene BG757 in Arabidopsis, encoding a putative dehydrin type protein. ABA induces the expression of various dehydrins in plants, therefore, to elucidate the potential role, ABA sensitivity was examined in Arabidopsis transgenic lines expressing BG757 . Interestingly, BG757 -expressing plants showed hypersensitivity towards NaCl and ABA during seed germination. In addition to germination, BG757 -expressing plants also showed root growth retardation in the presence of ABA and NaCl when compared with wild type (WT), suggesting that BG757 positively regulate salt stress and ABA response. Furthermore, BG757 -expressing plants showed significant drought tolerance compared with WT. Consistent with drought tolerance, expression levels of stress inducible genes ( DREB2A , RD22 , RD26 , LEA7 and SOS1 ) were strongly upregulated in transgenic plants compared with WT. All together these results suggest that heterologous expression of bacterial gene, BG757 in plants promotes resistance to environmental stresses., Supplementary Information: The online version contains supplementary material available at 10.1007/s12298-023-01358-w., Competing Interests: Conflict of interestNo interest to declare., (© Prof. H.S. Srivastava Foundation for Science and Society 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.)
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- 2023
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17. Interaction of high-fat diet and brain trauma alters adipose tissue macrophages and brain microglia associated with exacerbated cognitive dysfunction.
- Author
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Henry RJ, Barrett JP, Vaida M, Khan NZ, Makarevich O, Ritzel RM, Faden AI, and Stoica BA
- Abstract
Obesity increases the morbidity and mortality of traumatic brain injury (TBI). We performed a detailed analysis of transcriptomic changes in the brain and adipose tissue to examine the interactive effects between high-fat diet-induced obesity (DIO) and TBI in relation to central and peripheral inflammatory pathways, as well as neurological function. Adult male mice were fed a high-fat diet (HFD) for 12 weeks prior to experimental TBI and continuing after injury. Combined TBI and HFD resulted in additive dysfunction in the Y-Maze, novel object recognition (NOR), and Morris water maze (MWM) cognitive function tests. We also performed high-throughput transcriptomic analysis using Nanostring panels of cellular compartments in the brain and total visceral adipose tissue (VAT), followed by unsupervised clustering, principal component analysis, and IPA pathway analysis to determine shifts in gene expression programs and molecular pathway activity. Analysis of cellular populations in the cortex and hippocampus as well as in visceral adipose tissue during the chronic phase after combined TBI-HFD showed amplification of central and peripheral microglia/macrophage responses, including superadditive changes in select gene expression signatures and pathways. These data suggest that HFD-induced obesity and TBI can independently prime and support the development of altered states in brain microglia and visceral adipose tissue macrophages, including the disease-associated microglia/macrophage (DAM) phenotype observed in neurodegenerative disorders. The interaction between HFD and TBI promotes a shift toward chronic reactive microglia/macrophage transcriptomic signatures and associated pro-inflammatory disease-altered states that may, in part, underlie the exacerbation of cognitive deficits. Targeting of HFD-induced reactive cellular phenotypes, including in peripheral adipose tissue macrophages, may serve to reduce microglial maladaptive states after TBI, attenuating post-traumatic neurodegeneration and neurological dysfunction., Competing Interests: Declaration of Competing Interest The authors declare no competing financial interest
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- 2023
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18. Sr 2+ doped CsPbBrI 2 perovskite nanocrystals coated with ZrO 2 for applications as white LEDs.
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Padhiar MA, Ji Y, Wang M, Pan S, Ali Khan S, Khan NZ, Zhao L, Qin F, Zhao Z, and Zhang S
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Perovskite nanocrystals (NCs) feature adjustable bandgap, wide absorption range, and great color purity for robust perovskite optoelectronic applications. Nevertheless, the absence of lasting stability under continues energization, is still a major hurdle to the widespread use of NCs in commercial applications. In particular, the reactivity of red-emitting perovskites to environmental surroundings is more sensitive than that of their green counterparts. Here, we present a simple synthesis of ultrathin ZrO
2 coated, Sr2+ doped CsPbBrI2 NCs. Introducing divalent Sr2+ may significantly eliminate Pb° surface traps, whereas ZrO2 encapsulation greatly improves environmental stability. The photoluminescence quantum yield of the Sr2+ -doped CsPbBrI2 /ZrO2 NCs was increased from 50.2% to 87.2% as a direct consequence of the efficient elimination of Pb° surface defects. Moreover, the thickness of the ZrO2 thin coating gives remarkable heat resistance and improved water stability. Combining CsPbSr0.3 BrI2 /ZrO2 NCs in a white light emitting diode (LED) with an excellent optical efficiency (100.08 lm W-1 ), high and a broad gamut 141% (NTSC) standard. This work offers a potential method to suppress Pb° traps by doping with Sr2+ and improves the performance of perovskite NCs by ultrathin coating structured ZrO2 , consequently enabling their applicability in commercial optical displays., (© 2023 IOP Publishing Ltd.)- Published
- 2023
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19. Age-related changes in plasma extracellular vesicles influence neuroinflammation in the brain and neurological outcome after traumatic spinal cord injury.
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Lei Z, Krishnamachary B, Ritzel RM, Khan NZ, Li Y, Li H, Brunner K, Faden AI, and Wu J
- Abstract
Approximately 20% of all spinal cord injuries (SCI) occur in persons aged 65 years or older. Longitudinal, population-based studies showed that SCI is a risk factor for dementia. However, little research has addressed the potential mechanisms of SCI-mediated neurological impairment in the elderly. We compared young adult and aged C57BL/6 male mice subjected to contusion SCI, using a battery of neurobehavioral tests. Locomotor function showed greater impairment in aged mice, which was correlated with reduced, spared spinal cord white matter and increased lesion volume. At 2 months post-injury, aged mice displayed worse performance in cognitive and depressive-like behavioral tests. Transcriptomic analysis identified activated microglia and dysregulated autophagy as the most significantly altered pathways by both age and injury. Flow cytometry demonstrated increased myeloid and lymphocyte infiltration at both the injury site and brain of aged mice. SCI in aged mice was associated with altered microglial function and dysregulated autophagy involving both microglia and brain neurons. Altered plasma extracellular vesicles (EVs) responses were found in aged mice after acute SCI. EV-microRNA cargos were also significantly altered by aging and injury, which were associated with neuroinflammation and autophagy dysfunction. In cultured microglia, astrocytes, and neurons, plasma EVs from aged SCI mice, at a lower concentration comparable to those of young adult SCI mice, induced the secretion of pro-inflammatory cytokines CXCL2 and IL-6, and increased caspase3 expression. Together, these findings suggest that age alters the EVs pro-inflammatory response to SCI, potentially contributing to worse neuropathological and functional outcomes., Competing Interests: Competing interests Authors declare that they have no competing interests
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- 2023
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20. Delpinium uncinatum mediated green synthesis of AgNPs and its antioxidant, enzyme inhibitory, cytotoxic and antimicrobial potentials.
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Rehman H, Ali W, Ali M, Khan NZ, Aasim M, Khan AA, Khan T, Ali M, Ali A, Ayaz M, Shah M, and Hashmi SS
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- Humans, Antioxidants pharmacology, Acetylcholinesterase, Butyrylcholinesterase, Plant Extracts pharmacology, Silver pharmacology, Anti-Bacterial Agents pharmacology, Metal Nanoparticles, Anti-Infective Agents pharmacology, Antineoplastic Agents pharmacology
- Abstract
Green synthesis of nanoparticles is becoming a method of choice for biological research due to its environmentally benign outcomes, stability and ease of synthesis. In this study, silver nanoparticles (AgNPs) were synthesized using stem (S-AgNPs), root (R-AgNPs) and mixture of stem and root (RS-AgNPs) of Delphinium uncinatum. The synthesized nanoparticles were characterized by standardized techniques and evaluated for their antioxidant, enzyme inhibition, cytotoxic and antimicrobial potentials. The AgNPs exhibited efficient antioxidant activities and considerable enzyme inhibition potential against alpha amylase, acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) enzymes. S-AgNPs showed strong cytotoxicity against human hepato-cellular carcinoma cells (HepG2) and high enzyme inhibitory effect (IC50 values 27.5μg/ml for AChE and 22.60 μg/ml for BChE) compared to R-AgNPs and RS-AgNPs. RS-AgNPs showed significant inhibition of Klebsiella pneumoniae and Aspergillus flavus and exhibited higher biocompatibility (<2% hemolysis) in human red blood cells hemolytic assays. The present study showed that biologically synthesized AgNPs using the extract of various parts of D. uncinatum have strong antioxidant and cytotoxic potentials., Competing Interests: The authors have declared that no competing interests exist., (Copyright: © 2023 Rehman et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.)
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- 2023
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21. High-frequency Contactless Sensor for the Detection of Heparin-Induced Thrombocytopenia Antibodies via Platelet Aggregation.
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Khan NZ, Martin D, Pliquett U, Zaikou Y, Thomas N, Heinrich D, Köhler JM, and Nguyen TH
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- Humans, Platelet Factor 4, Heparin adverse effects, Platelet Function Tests, Antibodies, Platelet Aggregation, Thrombocytopenia chemically induced, Thrombocytopenia diagnosis
- Abstract
Heparin-induced thrombocytopenia (HIT), a severe autoimmune disorder, occurs in patients undergoing heparin therapy. The presence of platelet-activating antibodies against platelet factor 4/Heparin in the blood confirms patients suffering from HIT. The most widely used methods for HIT diagnosis are immunoassays but the results only suit to rule out HIT as the assays provide only around 50% specificity. To confirm HIT, samples with positive results in immunoassays are retested in functional assays (>98% specificity) that track platelet-activating antibodies via platelet aggregation. However, the protocols in functional assays are either time-consuming (due to the requirement of the detection of serotonin release) or require highly trained staff for the visualization of platelets. Here, we applied a cheap and easy-to-use contactless sensor, which employs high-frequency microwaves to detect the changes in the resonant frequency caused by platelet aggregation/activation. Analysis of change in conductivity and permittivity allowed us to distinguish between HIT-like (KKO) and non-HIT-like (RTO) antibodies. KKO caused a stronger reduction of conductivity of platelet samples than RTO. Our results imply that the high-frequency contactless sensor can be a promising approach for the development of a better and easier method for the detection of HIT.
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- 2022
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22. Genome-wide in silico identification and characterization of the stress associated protein (SAP) gene family encoding A20/AN1 zinc-finger proteins in potato (Solanum tuberosum L.).
- Author
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Billah SA, Khan NZ, Ali W, Aasim M, Usman M, Alezzawi MA, and Ullah H
- Subjects
- Gene Expression Regulation, Plant, Phylogeny, Plant Proteins genetics, Plant Proteins metabolism, Stress, Physiological genetics, Zinc metabolism, Arabidopsis metabolism, Solanum tuberosum genetics, Solanum tuberosum metabolism
- Abstract
Stress associated proteins (SAPs) in plants have a key role in providing tolerance to multiple abiotic stresses. SAP gene family in Solanum tuberosum has not been fully studied before. This study identified 17 StSAP genes in S. tuberosum which code for A20/AN1 zinc-finger proteins. All the genes were distributed on ten different chromosomes and six segmental duplication events were identified. The SAPs in S. tuberosum and its orthologs in Arabidopsis thaliana were classified into six groups through the phylogenetic analysis. Introns across StSAP genes were identified in four genes. The promotor study of the StSAP genes showed different hormone and stress-related cis-elements that could potentially have a role in environmental stress response. The expression of StSAP genes in response to heat, mannitol, and salt were analyzed through in silico transcriptomic analysis. This study could potentially help in further understanding the functions of SAP genes in S. tuberosum., Competing Interests: The authors have declared that no competing interests exist.
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- 2022
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23. Use of Artificial Intelligence-Based Strategies for Assessing Suicidal Behavior and Mental Illness: A Literature Review.
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Khan NZ and Javed MA
- Abstract
Mental illness leading to suicide attempts is prevalent in a large portion of the population especially in low and middle-income nations. There remains a significant social stigma associated with mental illness that can lead to stigmatization of patients. Hence, patients are reluctant to communicate their problems to health care providers. Physicians have difficulty in timely identification of patients at risk for suicide. Novel and rigorously designed strategies are needed to determine the population at risk for suicide. This would be the first step in overcoming the multitude of barriers in the management of mental illness. Clinical tools and the use of electronic medical records (EMR) are time intensive. Recently, several artificial intelligence (AI)-based predictive technologies have gained momentum. The aim of this review is to summarize the recent advances in this landscape., Competing Interests: The authors have declared that no competing interests exist., (Copyright © 2022, Khan et al.)
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- 2022
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24. Autism spectrum disorder in a rural community in Bangladesh: A mid-childhood assessment.
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Ali H, Rahman H, Lee LC, Khan NZ, Wu LS, Mehra S, Mitra M, Labrique AB, West KP Jr, and Christian P
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- Bangladesh epidemiology, Child, Communication, Female, Humans, Male, Rural Population, Autism Spectrum Disorder diagnosis, Autism Spectrum Disorder epidemiology, Autistic Disorder
- Abstract
Population-based studies employing standardized diagnostics are needed to determine the burden of autism spectrum disorder (ASD) in low-resource settings. A community-based study was conducted among 8-11 year old children in rural, northwestern Bangladesh to establish the prevalence of ASD. A standardized screening and diagnosis protocol was adapted and deployed comprising the social communication questionnaire (SCQ), and the autism diagnostic observation schedule 2, (ADOS-2), and the autism diagnostic interview, revised (ADI-R), respectively. A year-long research training was conducted for a clinical psychologist to be certified to administer ADOS-2 and ADI-R. Over 8000 children were visited at home and administered the SCQ leading to some, based on their score, being further evaluated using the ADOS-2 and ADI-R by the clinical psychologist. Based on ADOS-2 applying the diagnoses of autism or autism spectrum, the prevalence was 40 (95% CI: 27, 54) per 10,000. Autistic disorder using ADI-R was found at 12 (95% CI: 5, 20) per 10,000. Boys were at a higher risk than girls with the rates among boys being 46 (95% CI: 25, 67) using ADOS-2 and 19 (95% CI:6, 33) using ADI-R. Among girls the rates were 34 (95% CI:16, 52) and 5 (95% CI:0, 12) per 10,000, respectively. Challenges to undertaking ASD research in a rural South Asian context are discussed. There was a low-to-moderate prevalence of ASD in a rural, child population in Bangladesh. Future research is needed to estimate rates of ASD and its causes and socioeconomic consequences in rural and urban settings of South Asia. LAY SUMMARY: In a study of over 8000, 8-11 year old children in a rural area of Bangladesh, two to four out of 1000 had ASD. Boys more than girls had ASD. Conducting ASD assessment in this setting was difficult, but more such research is needed to understand what causes ASD and its consequences for the individual, families and the society in rural and urban areas of low-income countries., (© 2021 International Society for Autism Research and Wiley Periodicals LLC.)
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- 2022
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25. Artificial Intelligence against COVID-19 Pandemic: A Comprehensive Insight.
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Equbal A, Masood S, Equbal I, Ahmad S, Khan NZ, and Khan ZA
- Subjects
- Humans, Pandemics prevention & control, Artificial Intelligence, SARS-CoV-2, COVID-19, Pneumonia, Viral epidemiology, Pneumonia, Viral prevention & control
- Abstract
COVID-19 is a pandemic initially identified in Wuhan, China, which is caused by a novel coronavirus, also recognized as the Severe Acute Respiratory Syndrome (SARS-nCoV-2). Unlike other coronaviruses, this novel pathogen may cause unusual contagious pain, which results in viral pneumonia, serious heart problems, and even death. Researchers worldwide are continuously striving to develop a cure for this highly infectious disease, yet there are no well-defined absolute treatments available at present. Several vaccination drives using emergency use authorisation vaccines have been held across many countries; however, their long-term efficacy and side-effects studies are yet to be studied. Various analytical and statistical models have been developed, however, their outcome rate is prolonged. Thus, modern science stresses the application of state-of-the-art methods to combat COVID-19. This paper aims to provide a deep insight into the comprehensive literature about AI and AI-driven tools in the battle against the COVID-19 pandemic. The high efficacy of these AI systems can be observed in terms of highly accurate results, i.e., > 95%, as reported in various studies. The extensive literature reviewed in this paper is divided into five sections, each describing the application of AI against COVID-19 viz. COVID-19 prevention, diagnostic, infection spread trend prediction, therapeutic and drug repurposing. The application of Artificial Intelligence (AI) and AI-driven tools are proving to be useful in managing and fighting against the COVID-19 pandemic, especially by analysing the X-Ray and CT-Scan imaging data of infected subjects, infection trend predictions, etc., (Copyright© Bentham Science Publishers; For any queries, please email at epub@benthamscience.net.)
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- 2022
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26. A Higher Altitude Is Associated with Increased Incidence of Infections following Primary Total Hip Arthroplasty.
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Khan NZ, Hamaway SN, Weisberg MD, Horn AR, Vakharia RM, and Razi AE
- Abstract
Purpose: The purpose of this study was to evaluate whether patients undergoing primary total hip arthroplasty (THA) at a higher elevation have higher rates of: 1) in-hospital length of stay (LOS); 2) surgical site infections (SSIs); 3) periprosthetic joint infections (PJIs); and 4) costs., Materials and Methods: The Medicare claims database was used to identify patients who underwent primary THA at an altitude higher than 4,000 feet (ft). High-altitude patients were matched to patients who underwent primary THA at an altitude less than 100 ft, yielding 24,958 and 124,765 patients respectively. Outcomes that were assessed included in-hospital LOS, SSIs, PJIs, and costs of care. A P -value less than 0.001 was considered statistically significant., Results: Patients in the study group had significantly longer in-hospital LOS (4 days vs 3 days, P <0.0001). In addition, patients in the study group had a significantly higher incidence and odds of developing SSIs (1.16% vs 0.86%; odds ratio [OR], 1.34; P <0.0001) and PJIs (0.91% vs 0.58%; OR, 1.56; P <0.0001) within 90-days following the index procedure, compared to matched controls. Higher altitude patients incurred higher day of surgery ($16,139.76 vs $15,279.42; P <0.0001) and 90-day costs ($18,647.51 vs $16,401.62; P <0.0001)., Conclusion: This study demonstrated that primary THA procedures performed at an elevation higher than 4,000 ft are associated with longer in-hospital LOS, higher rates of SSIs, PJIs, and costs of care. Orthopedists and other healthcare professionals can use this information to provide adequate education for these patients regarding the potential complications that may occur following their procedure., Competing Interests: CONFLICT OF INTEREST: The authors declare that there is no potential conflict of interest relevant to this article., (Copyright © 2021 by Korean Hip Society.)
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- 2021
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27. Evaluation of analgesic, antiamnesic and antidiarrheal potentials of Medicago denticulata extract using animal model.
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Ahmad S, Khan S, Zeb A, Shah SWA, Ahmad B, Khan AA, Ali W, Khan NZ, and Zamani GY
- Abstract
The analgesic, antidiarrheal, and neuro-pharmacological potentials of Medicago denticulata leaves extract were screened in animal models. Potential analgesic response was noted (*P < 0.05,
** P < 0.01,*** P < 0.001) in formalin, acetic acid and heat-induced pain models in a dose-dependent manner. Maximum activity by means of writhing inhibition was documented for Medicago denticulata at 300 mg/kg that was found to be 71.79% (17.43 ± 1.31). In first phase, the Medicago denticulata at a dose of 150 and 300 mg/kg showed analgesic activity and reduced the pain by 54.18% (18.39 ± 1.67) and 62.90% (14.89 ± 1.56), respectively. In second phase, the Medicago denticulata at a dose of 150 and 300 mg/kg showed analgesic activity and reduced the pain by 69.48% (19.78 ± 1.44) and 70.89% (18.86 ± 1.58), respectively. In hot plate method, the Medicago denticulata at a dose of 150 and 300 mg/kg showed the maximum response of 61.16% (8.47 ± 1.23) and 67.39% (10.09 ± 1.04), respectively at 60 min. Scopolamine significantly reduces spontaneous alteration in Y-maze model for antiamnesic activity. Medicago denticulata significantly increased the discrimination index in a dose-dependent manner using novel object recognition test (NORT) model. Exploration time in sec for the novel object was increased significantly (P < 0.001) by donepezil decreased for familiar one with a discrimination index (DI) of 62.18%. Medicago denticulata significantly increased the discrimination index by 60.86% and 57.24% at 300 and 150 mg/kg b.w, respectively. The lowest DI of 53.80% at 75 mg/kg was observed in comparison to the amnesic group. The Medicago denticulata significant decreased the elevated levels of acetylcholinesterase (AChE) and malondialdehyde (MDA and enhancing level of acetylcholine (ACh), superoxide dismutase (SOD) and catalase (CAT) acting as an antioxidant agent. Medicago denticulata reduced the total number of diarrheal feces to lesser extent at dose-dependent manner. From the study results, it is suggested that the Medicago denticulata extract possess good analgesic and antiamnesic activity however the antidiarrheal effects of plant were negligible. In the current study, the traditional use of the plant as a source of medicine has been validated., Competing Interests: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (© 2021 The Author(s).)- Published
- 2021
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28. Adverse childhood experiences predict reaction to multiple sclerosis diagnosis.
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Eilam-Stock T, Links J, Khan NZ, Bacon TE, Zuniga G, Laing L, Sammarco C, Sherman K, and Charvet L
- Abstract
Objective: At the time of multiple sclerosis (MS) diagnosis, identifying those at risk for poorer health-related quality of life and emotional well-being can be a critical consideration for treatment planning. This study aimed to test whether adverse childhood experiences predict MS patients' health-related quality of life and emotional functioning at time of diagnosis and initial course of disease., Methods: We recruited patients at the time of new MS diagnosis to complete self-report surveys at baseline and a one-year follow-up. Questionnaires included the Adverse Childhood Experiences (ACEs), as well as the MS Knowledge Questionnaire (MSKQ), the 36-Item Short Form Health Survey (SF-36), and Self-Management Screening (SeMaS)., Results: A total of n = 31 participants recently diagnosed with relapsing remitting MS (median EDSS = 1.0, age M = 33.84 ± 8.4 years) completed the study measures. The ACEs significantly predicted health-related quality of life (SF-36) at baseline (Adjusted R
2 = 0.18, p = 0.011) and follow-up (Adjusted R2 = 0.12, p = 0.03), baseline scores on the SeMaS Depression scale (Adjusted R2 = 0.19, p = 0.008), as well as follow-up scores on the SeMaS Anxiety (Adjusted R2 = 0.19, p = 0.014) and SeMaS Depression (Adjusted R2 = 0.14, p = 0.036) scales. Importantly, increased ACEs scores were predictive of increased anxiety at the one-year follow-up assessment, compared to baseline., Conclusions: Childhood adversity predicts health-related quality of life and emotional well-being at time of MS diagnosis and over the initial course of the disease. Measured using a brief screening inventory (ACEs), routine administration may be useful for identifying patients in need of increased supportive services., Competing Interests: Declaration of conflicting interests: The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article., (© The Author(s) 2021.)- Published
- 2021
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29. Label-Free Detection and Characterization of Heparin-Induced Thrombocytopenia (HIT)-like Antibodies.
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Khan NZ, Chen LY, Lindenbauer A, Pliquett U, Rothe H, and Nguyen TH
- Abstract
Heparin-induced thrombocytopenia (HIT) antibodies (Abs) can mediate and activate blood cells, forming blood clots. To detect HIT Abs, immunological assays with high sensitivity (≥95%) and fast response are widely used, but only about 50% of these tests are accurate as non-HIT Abs also bind to the same antigens. We aim to develop biosensor-based electrical detection to better differentiate HIT-like from non-HIT-like Abs. As a proof of principle, we tested with two types of commercially available monoclonal Abs including KKO (inducing HIT) and RTO (noninducing HIT). Platelet factor 4/Heparin antigens were immobilized on gold electrodes, and binding of antibodies on the chips was detected based on the change in the charge transfer resistance ( R
ct ). Binding of KKO on sensors yielded a significantly lower charge transfer resistance than that of RTO. Bound antibodies and their binding characteristics on the sensors were confirmed and characterized by complementary techniques. Analysis of thermal kinetics showed that RTO bonds are more stable than those of KKO, whereas KKO exhibited a higher negative ζ potential than RTO. These different characteristics made it possible to electrically differentiate these two types of antibodies. Our study opens a new avenue for the development of sensors for better detection of pathogenic Abs in HIT patients., Competing Interests: The authors declare no competing financial interest., (© 2021 The Authors. Published by American Chemical Society.)- Published
- 2021
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30. Response to Letter to the Editor on "Crohn's Disease Is Associated With Longer In-Hospital Lengths of Stay and Higher Rates of Complications and Costs Following Primary Total Hip Arthroplasty".
- Author
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Voyvodic LC, Khan NZ, Lam AW, Horn AR, Mont MA, and Razi AE
- Subjects
- Hospital Costs, Hospitals, Humans, Length of Stay, Arthroplasty, Replacement, Hip adverse effects, Crohn Disease
- Published
- 2021
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31. Prioritization of lower back pain risk factors among industrial workers using the best-worst method.
- Author
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Khan NZ, Shihab SK, Attri R, Siddiquee AN, and Khan ZA
- Subjects
- Humans, Risk Factors, Low Back Pain epidemiology, Musculoskeletal Diseases, Occupational Diseases epidemiology
- Abstract
Although lower back pain (LBP) is reported to be the most prevalent musculoskeletal disorder related to work amongst workers, little systematic effort has been made to identify the factors and to determine their priority for the onset of LBP. In this article, an attempt has been made to determine the priority of LBP risk factors using a relatively new, simple and effective multicriteria decision-making method, i.e., the best-worst method. The best-worst method has been used in this research as it makes use of relatively fewer data for comparisons and it provides comparisons with better consistency leading to more reliable results. Results of the study revealed that the occupational factor is the most prominent main risk factor for LBP, followed by psychosocial and personal factors. Further, physical load and genetics are the most and least dominating LBP risk factors, respectively.
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- 2021
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32. Crohn's Disease is Associated with Longer In-Hospital Lengths of Stay and Higher Rates of Complications and Costs after Primary Total Hip Arthroplasty.
- Author
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Voyvodic LC, Khan NZ, Lam AW, Horn AR, Mont MA, and Razi AE
- Subjects
- Aged, Hospitals, Humans, Length of Stay, Medicare, North America, Postoperative Complications, Retrospective Studies, Risk Factors, United States, Arthroplasty, Replacement, Hip, Crohn Disease
- Abstract
Background: As the incidence and prevalence of Crohn's disease continues to change worldwide, rates within North America have been increasing. The objective of this study was to evaluate whether patients who have Crohn's disease undergoing primary total hip arthroplasties have worse outcomes compared with matched cohorts. Specifically, we evaluated 1) medical complications, 2) in-hospital lengths of stay (LOS), and 3) costs of care., Methods: Two cohorts of patients who underwent primary total hip arthroplasties from January 1, 2005 to March 31, 2014 were identified from the Medicare claims of the PearlDiver platform. Cohorts were matched by age, sex, and following comorbidities-anemia, diabetes, hyperlipidemia, hypertension, malnutrition, pulmonary disease, and renal failure, yielding 55,361 patients within the study (n = 9229) and matching cohorts (n = 46,132). Outcomes assessed included 90-day medical complications, in-hospital LOS, and costs of care. A P-value less than .005 was considered statistically significant., Results: Patients with Crohn's disease were found to have significantly higher incidences and odds ratios of 90-day medical complications (30.2 vs 13.8; odds ratios: 2.2, P < .0001). They were also found to have significantly longer LOS (3.8- vs 3.6-days, P < .0001) and higher day of surgery ($12,662.00 vs 12,271.15, P < .0001) and 90-day episode costs ($16,933.18 vs $15,670.32, P < .0001)., Conclusion: Crohn's disease is associated with higher rates of medical complications, longer in-hospital LOS, and increased costs of care. This study may aid physicians to perform appropriate risk adjustment for adverse outcomes and to educate these patients about potential postoperative complications in these patients., (Copyright © 2021 Elsevier Inc. All rights reserved.)
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- 2021
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33. Impact of emollient therapy for preterm infants in the neonatal period on child neurodevelopment in Bangladesh: an observational cohort study.
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Darmstadt GL, Khan NZ, Rosenstock S, Muslima H, Parveen M, Mahmood W, Ahmed ASMNU, Chowdhury MAKA, Zeger S, and Saha SK
- Subjects
- Bangladesh, Child, Child Development, Child, Preschool, Follow-Up Studies, Humans, Infant, Infant, Newborn, Infant, Very Low Birth Weight, Emollients therapeutic use, Infant, Premature
- Abstract
Background: Topical treatment with sunflower seed oil (SSO) or Aquaphor® reduced sepsis and neonatal mortality in hospitalized preterm infants <33 weeks' gestational age in Bangladesh. We sought to determine whether the emollient treatments improved neurodevelopmental outcomes during early childhood., Methods: 497 infants were randomized to receive SSO, Aquaphor®, or neither through the neonatal period or hospital discharge. 159 infant survivors were enrolled in the longitudinal follow-up study using a validated Rapid Neurodevelopmental Assessment tool and the Bayley Scales of Infant Development II (BSID II) administered at three-monthly intervals for the first year and thereafter at six-monthly intervals. Lowess smoothing was used to display neurodevelopmental status across multiple domains by age and treatment group, and Generalized Estimating Equations (GEE) were used to compare treatment groups across age points., Results: 123 children completed at least one follow-up visit. Lowess graphs suggest that lower proportions of children who received massage with either SSO or Aquaphor® had neurodevelopmental delays than control infants in a composite outcome of disabilities. In GEE analysis, infants receiving SSO showed a significant protective effect on the development of fine motor skills [odds ratio (OR) 0.92, 95% confidence interval (CI) 0.86-0.98, p=0.006]. The Psychomotor Development Index (PDI) in the BSID II showed significantly lower disability rates in the Aquaphor group (23.6%) compared to the control (55.2%) (OR 0.21, 95% CI 0.06-0.72, p=0.004)., Conclusions: Emollient massage of very preterm, hospitalized newborn infants improved some child neurodevelopmental outcomes over the first 2 years of follow-up. Findings warrant further confirmatory research., Trial Registration: ClinicalTrials.gov (98-04-21-03-2) under weblink https://clinicaltrials.gov/ct2/show/NCT00162747.
- Published
- 2021
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34. Therapeutic role of Typha elephantina leaves aqueous extract in paracetamol intoxicated rabbits.
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Ahmad B, Yousafzai AM, Zeb A, Ali W, Khan NZ, Aasim M, Ahmad S, Ullah S, Khan AA, Naz F, and Raziq S
- Subjects
- Acetaminophen toxicity, Animals, Dose-Response Relationship, Drug, Free Radical Scavengers metabolism, Glutathione metabolism, Liver drug effects, Liver metabolism, Male, Rabbits, Acetaminophen antagonists & inhibitors, Analgesics, Non-Narcotic toxicity, Plant Extracts therapeutic use, Plant Leaves chemistry, Typhaceae chemistry
- Abstract
Present study is aimed to investigate the hepatoprotective and hematopoietic effect of Typha elephantina leaves aqueous (T.E.AQ), extract in paracetamol (PCM) intoxicated rabbits. Experimental animals were divided into various groups. The blood was taken on day 7th (W1=Week 1), day 14th (W2 = week 2) and day 21st (W3 = week 3) of treatments and was analyzed for all hematological and serum biochemical markers. PCM administration caused marked increase in the levels of serum biochemical and hematological parameters. The leaves of T.E.AQ extract at dose rate 300mg/kg body weight significantly (P<0.05) reduced the elevated levels of serum biochemical and hematological indices towards normal values on third week (day 21st) of treatment while treatment in the first two weeks revealed non-significant effects even at all doses of extract. The levels of glutathione (GSH) and radical scavenging activity (RSA) were reduced and thiobarbituric acid reactive substances (TBARS) levels was high in the PCM feed animals. Administration of (T.E.AQ) extract at high dose (300mg/kg) significantly regulated and normalized these antioxidant values. The antioxidant capacity of (TE.AQ) extract, showed increase inhibition against various extract concentrations on the basis of percent scavenging of (DPPH) free radical. The histological sections of liver further supported the hepatoprotective activity of extract.
- Published
- 2021
35. Spinal cord injury alters microRNA and CD81+ exosome levels in plasma extracellular nanoparticles with neuroinflammatory potential.
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Khan NZ, Cao T, He J, Ritzel RM, Li Y, Henry RJ, Colson C, Stoica BA, Faden AI, and Wu J
- Subjects
- Animals, Mice, Exosomes, Extracellular Vesicles, MicroRNAs, Nanoparticles, Spinal Cord Injuries
- Abstract
Extracellular vesicles (EVs) have been implicated mechanistically in the pathobiology of neurodegenerative disorders, including central nervous system injury. However, the role of EVs in spinal cord injury (SCI) has received limited attention to date. Moreover, technical limitations related to EV isolation and characterization methods can lead to misleading or contradictory findings. Here, we examined changes in plasma EVs after mouse SCI at multiple timepoints (1d, 3d, 7d, 14d) using complementary measurement techniques. Plasma EVs isolated by ultracentrifugation (UC) were decreased at 1d post-injury, as shown by nanoparticle tracking analysis (NTA), and paralleled an overall reduction in total plasma extracellular nanoparticles. Western blot (WB) analysis of UC-derived plasma EVs revealed increased expression of the tetraspanin exosome marker, CD81, between 1d and 7d post-injury. To substantiate these findings, we performed interferometric and fluorescence imaging of single, tetraspanin EVs captured directly from plasma with ExoView®. Consistent with WB, we observed significantly increased plasma CD81+ EV count and cargo at 1d post-injury. The majority of these tetraspanin EVs were smaller than 50 nm based on interferometry and were insufficiently resolved by flow cytometry-based detection. At the injury site, there was enhanced expression of EV biogenesis proteins that were also detected in EVs directly isolated from spinal cord tissue by WB. Surface expression of tetraspanins CD9 and CD63 increased in multiple cell types at the injury site; however, astrocyte CD81 expression uniquely decreased, as demonstrated by flow cytometry. UC-isolated plasma EV microRNA cargo was also significantly altered at 1d post-injury with changes similar to that reported in EVs released by astrocytes after inflammatory stimulation. When injected into the lateral ventricle, plasma EVs from SCI mice increased both pro- and anti-inflammatory gene as well as reactive astrocyte gene expression in the brain cortex. These studies provide the first detailed characterization of plasma EV dynamics after SCI and suggest that plasma EVs may be involved in posttraumatic brain inflammation., (Copyright © 2020 The Author(s). Published by Elsevier Inc. All rights reserved.)
- Published
- 2021
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36. Iron-doped zinc oxide nanoparticles-triggered elicitation of important phenolic compounds in cell cultures of Fagonia indica .
- Author
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Khan AU, Khan T, Khan MA, Nadhman A, Aasim M, Khan NZ, Ali W, Nazir N, and Zahoor M
- Abstract
The callus cultures of Fagonia indica could prove as factories for the production of important phytochemicals when triggered through different types of stress. In this study, we initiated callus cultures from healthy stem explants in the presence of iron-doped zinc oxide nanoparticles (Fe-ZnO-NPs). We performed experiments with the callus cultures of F. indica to determine the impact of Fe-ZnO-NPs in concentrations (15.62-250 µg/mL) on biomass accumulation, production of important phenolic and flavonoids, and antioxidative potential. Our results showed that maximum callus biomass [Fresh weight (FW) = 13.6 g and Dry weight (DW) = 0.58 ± 0.01] was produced on day 40 when the media was supplemented with 250 μg/mL Fe-ZnO-NPs. Similarly, maximum total phenolic content (268.36 μg GAE/g of DW) was observed in 40 days old callus added with 125 μg/mL Fe-ZnO-NPs. Maximum total flavonoid content (78.56 μg QE/g of DW) was recorded in 20 days old callus grown in 62.5 μg/mL Fe-ZnO-NPs containing media. Maximum total antioxidant capacity (390.74 µg AAE/g of DW) was recorded in 40 days old callus with 125 μg/mL Fe-ZnO-NPs treated cultures, respectively. Similarly, the highest free radical scavenging activity (93.02%) was observed in callus derived from media having 15.62 µg/mL Fe-ZnO-NPs. The antioxidant potential was observed to have positive correlation with TPC (r = 0.44). HPLC analysis showed that Fe-ZnO-NPs produced compounds (e.g., Epigallocatechin gallate) that were either absent or in lesser quantities in the control group. These results showed that Fe-ZnO-NPs elicitors could increase the biomass and activate secondary metabolism in F. indica cells., Supplementary Information: The online version contains supplementary material available at 10.1007/s11240-021-02123-1., Competing Interests: Conflict of interestThe authors declare that they have no conflict of interest., (© The Author(s), under exclusive licence to Springer Nature B.V. 2021.)
- Published
- 2021
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37. Analyzing barriers for implementation of public health and social measures to prevent the transmission of COVID-19 disease using DEMATEL method.
- Author
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Maqbool A and Khan NZ
- Subjects
- COVID-19, Coronavirus Infections virology, Humans, Pneumonia, Viral virology, SARS-CoV-2, Betacoronavirus isolation & purification, Coronavirus Infections prevention & control, Coronavirus Infections transmission, Decision Support Techniques, Health Plan Implementation, Models, Theoretical, Pandemics prevention & control, Pneumonia, Viral prevention & control, Pneumonia, Viral transmission, Public Health
- Abstract
Background and Aims: COVID-19 is a contagious disease caused by a new coronavirus known as severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Till now there are no vaccines and explicit medicines available for the treatment of COVID-19 disease, therefore the initiatives like public health and social measures are helpful in limiting the quantity of contaminations and saving lives. Keeping this in view, an attempt has been made in the present work to identify the barriers which hinder the implementation of these public health and social measures METHODS: The barriers to implement public health and social measures for preventing transmission of COVID-19 are identified using systematic literature review and these barriers are then categorized using Decision-making trial and evaluation laboratory (DEMATEL) method., Results: Results reveal that among ten identified barriers, Lack of resources for implementing public health and social measures is found to be the most influential barrier to implement public health and social measures for preventing transmission of COVID-19., Conclusions: The successful implementation of public health and social measures depends on the adequate availability of resources which include medical equipment, personnel and financial dealings. The outcome of this research work will benefit and motivate the higher authorities to consider and overcome various challenges to prevent the transmission of COVID-19., Competing Interests: Declaration of competing interest None declared, (Copyright © 2020 Diabetes India. Published by Elsevier Ltd. All rights reserved.)
- Published
- 2020
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38. Comparative analysis of the effects of chemically and biologically synthesized silver nanoparticles on biomass accumulation and secondary metabolism in callus cultures of Fagonia indica .
- Author
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Begum S, Zahid A, Khan T, Khan NZ, and Ali W
- Abstract
Biotechnological strategies are needed to produce larger quantities of biomass and phytochemicals. In this study, callus cultures of Fagonia indica were elicited with different concentrations of chemically and biologically synthesized silver nanoparticles (chem- and bioAgNPs) to compare their effects on biomass, total phenolic content (TPC), total flavonoid content (TFC) and antioxidant activity of the extracts from callus. The results revealed that bioAgNPs being more biocompatible produced the highest biomass initially on day 10 (FW = 4.2152 ± 0.13 g; DW = 0.18527 ± 0.01 g) and day 20 (FW = 7.6558 ± 0.10 g; DW = 0.3489 ± 0.01 g) when supplemented in media as 62.5 µg/mL and 250 µg/mL, respectively. Initially, the highest TPC (319.32 ± 8.28 µg GAE/g of DW) was recorded on day 20 in chemAgNPs (31.25 µg/mL) induced callus as compared to TPC = 302.85 ± 3.002 µg GAE/g of DW in bioAgNPs-induced callus. Compared to the highest values of TFC (108.15 ± 2.10 µg QE/g of DW) produced in 15.6 µg/mL chemAgNPs-induced callus on day 20, TFC produced in bioAgNPs (62.5 µg/mL) was 168.61 ± 3.17 µg GAE/g of DW on day 10. Similarly, chemAgNPs-induced callus (62.5 µg/mL) showed the highest free radical scavenging activity (FRSA) i.e. 87.18% on day 20 while bioAgNPs (125 µg/mL) showed 81.69% FRSA on day 20 compared to highest among control callus (63.98% on day 40). The highest total antioxidant capacity of chemAgNPs-(125 µg/mL) induced callus was 330.42 ± 13.65 µg AAE/g of DW on day 20 compared to bioAgNPs-(62.5 µg/mL) induced callus (312.96 ± 1.73 µg AAE/g of DW) on day 10. Conclusively, bioAgNPs are potent elicitors of callus cultures of F. indica ., Competing Interests: Conflict of interestThe authors declare that they have no conflict of interest., (© Prof. H.S. Srivastava Foundation for Science and Society 2020.)
- Published
- 2020
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39. Comparative analysis of the methods used for finding surface energy to investigate protein interaction behavior on chromatographic supports.
- Author
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Aasim M, Khan MH, Rahman IU, Bibi NS, Ali W, Khan NZ, and Khan AA
- Subjects
- Adsorption, Chromatography, Colloids chemistry, Hydrophobic and Hydrophilic Interactions, Proteins isolation & purification, Surface Properties, Proteins chemistry, Thermodynamics
- Abstract
Hydrophobic interaction chromatography, an important and effective purification strategy, is generally used for the purification of variety of biomolecules. A basic understanding of the protein interaction behavior is required to effectively separate these biomolecules. A colloidal type extended Derjaguin, Landau, Verwey, and Overbeek calculations were utilized to study the interactions behavior of model proteins to commercially available hydrophobic chromatographic materials that is, Toyopearl Phenyl 650C and Toyopearl Butyl 650C. Physicochemical properties of selected model proteins were achieved by contact angle and zeta potential measurements. The contact angle of chromatographic materials used was achieved through sessile drop method on disrupted beads and capillary penetration method (CPM) on intact beads. The surface properties were further used to calculate the interactions of the proteins to chromatographic supports. The calculated secondary energy minimum of the proteins with the chromatographic materials (from the contact angle values determined through both methods can be correlated with the retention volumes from the real chromatography. The secondary energy minimum values are higher for each protein to the chromatographic materials calculated from the inputs derived through sessile drop method compared to CPM. For instance, immunoglobulin G has secondary energy minimum value of 0.17 kT compared to 0.11 kT, obtained through sessile drop method and CPM, respectively. Average relative values of the energy minimum calculated for all proteins are as 1.51 kT and 1.29 kT for Toyopearl Butyl 650C and Toyopearl Phenyl 650C, respectively, as a conversion factor for estimation of secondary energy minimum for both methods., (© 2019 American Institute of Chemical Engineers.)
- Published
- 2019
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40. Effect of focused birth preparedness and complication readiness counseling on pregnancy outcome among females attending tertiary care hospital in Barabanki district, Uttar Pradesh, India.
- Author
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Shukla M, Khan NZ, Agarwal A, Dwivedi AD, Singh JV, and Alam S
- Abstract
Context: Measures related to birth preparedness and complication readiness (BPCR) during pregnancy play an important role in producing better pregnancy outcome. If the pregnant females are properly counseled during antenatal visits, it could help in bringing out desirable behavior changes., Aims: This study aims to study BPCR-related awareness and practices among the pregnant females and the effect of focused and structured birth preparedness counseling on complication readiness among pregnant females., Subject and Methods: A facility-based follow-up study was conducted from July to December 2016, and a total of 130 pregnant females were enrolled. All study participants were initially assessed for various domains of BPCR index consisting of seven key indicators. The index reassessment was done again, after 1 month, during follow-up visit. Information regarding any pregnancy-related complication in due course and behavior was also recorded during successive follow-up., Statistical Analysis Used: The difference in pre- and postcounseling mean BPCR index was assessed using paired t -test, and McNemar's test was used for paired categorical data analysis. P < 0.05 was considered to be statistically significant., Results: The postcounseling BPCR index (70.65 ± 19.18) was found to be significantly much higher as compared to pre-counseling baseline BPCR index (41.12 ± 11.34). Knowledge about danger signs of pregnancy, transportation services provided by government, financial assistance provided in Government schemes, identification of skilled birth attendant, mode of transportation, and arrangement of emergency blood donor was found to increase significantly after counseling. Abortion was found to occur significantly higher (about thrice) among those who had postcounseling BPCR index below average, i.e., <50% ( P < 0.05)., Conclusions: The results of the present study revealed that focused birth preparedness counseling on complication readiness could play an important role in increasing the baseline knowledge of pregnant females regarding pregnancy-related complications and bring out desirable ideal health-seeking behavior changes during pregnancy., Competing Interests: There are no conflicts of interest.
- Published
- 2019
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41. Investigation on Effect of Strain Rate and Heat Generation on Traverse Force in FSW of Dissimilar Aerospace Grade Aluminium Alloys.
- Author
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Khan NZ, Bajaj D, Siddiquee AN, Khan ZA, Abidi MH, Umer U, and Alkhalefah H
- Abstract
The emergence of the aerospace sector requires efficient joining of aerospace grade aluminium alloys. For large-scale industrial practices, achievement of optimum friction stir welding (FSW) parameters is chiefly aimed at obtaining maximum strain rate in deforming material with least application of traverse force on the tool pin. Exact computation of strain rate is not possible due to complex and unexposed material flow kinematics. Estimation using micro-structural evolution serves as one of the very few methods applicable to analyze the yet unmapped interdependence of strain rate and traverse force. Therefore, the present work assessed strain rate in the stir zone using Zener Holloman parameter. The maximum and minimum strain rates of 6.95 and 0.31 s
-1 were obtained for highest and least traverse force, respectively.- Published
- 2019
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42. Gaps in Current Autism Research: The Thoughts of the Autism Research Editorial Board and Associate Editors.
- Author
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Amaral DG, Anderson GM, Bailey A, Bernier R, Bishop S, Blatt G, Canal-Bedia R, Charman T, Dawson G, de Vries PJ, Dicicco-Bloom E, Dissanayake C, Kamio Y, Kana R, Khan NZ, Knoll A, Kooy F, Lainhart J, Levitt P, Loveland K, Minshew N, Mueller RA, Murphy D, Mundy P, Palencia S, Pinto-Martin J, Rattazzi A, Rogers S, Stone WL, Webb SJ, and Whitehouse A
- Published
- 2019
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- View/download PDF
43. Detecting Developmental Delay and Autism Through Machine Learning Models Using Home Videos of Bangladeshi Children: Development and Validation Study.
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Tariq Q, Fleming SL, Schwartz JN, Dunlap K, Corbin C, Washington P, Kalantarian H, Khan NZ, Darmstadt GL, and Wall DP
- Subjects
- Bangladesh, Child, Child, Preschool, Female, Humans, Male, Validation Studies as Topic, Autism Spectrum Disorder diagnosis, Developmental Disabilities diagnosis, Machine Learning standards, Video Recording methods
- Abstract
Background: Autism spectrum disorder (ASD) is currently diagnosed using qualitative methods that measure between 20-100 behaviors, can span multiple appointments with trained clinicians, and take several hours to complete. In our previous work, we demonstrated the efficacy of machine learning classifiers to accelerate the process by collecting home videos of US-based children, identifying a reduced subset of behavioral features that are scored by untrained raters using a machine learning classifier to determine children's "risk scores" for autism. We achieved an accuracy of 92% (95% CI 88%-97%) on US videos using a classifier built on five features., Objective: Using videos of Bangladeshi children collected from Dhaka Shishu Children's Hospital, we aim to scale our pipeline to another culture and other developmental delays, including speech and language conditions., Methods: Although our previously published and validated pipeline and set of classifiers perform reasonably well on Bangladeshi videos (75% accuracy, 95% CI 71%-78%), this work improves on that accuracy through the development and application of a powerful new technique for adaptive aggregation of crowdsourced labels. We enhance both the utility and performance of our model by building two classification layers: The first layer distinguishes between typical and atypical behavior, and the second layer distinguishes between ASD and non-ASD. In each of the layers, we use a unique rater weighting scheme to aggregate classification scores from different raters based on their expertise. We also determine Shapley values for the most important features in the classifier to understand how the classifiers' process aligns with clinical intuition., Results: Using these techniques, we achieved an accuracy (area under the curve [AUC]) of 76% (SD 3%) and sensitivity of 76% (SD 4%) for identifying atypical children from among developmentally delayed children, and an accuracy (AUC) of 85% (SD 5%) and sensitivity of 76% (SD 6%) for identifying children with ASD from those predicted to have other developmental delays., Conclusions: These results show promise for using a mobile video-based and machine learning-directed approach for early and remote detection of autism in Bangladeshi children. This strategy could provide important resources for developmental health in developing countries with few clinical resources for diagnosis, helping children get access to care at an early age. Future research aimed at extending the application of this approach to identify a range of other conditions and determine the population-level burden of developmental disabilities and impairments will be of high value., (©Qandeel Tariq, Scott Lanyon Fleming, Jessey Nicole Schwartz, Kaitlyn Dunlap, Conor Corbin, Peter Washington, Haik Kalantarian, Naila Z Khan, Gary L Darmstadt, Dennis Paul Wall. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 24.04.2019.)
- Published
- 2019
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44. Estimation of Serum Creatinine and Uric Acid in Bangladeshi Gestational Diabetic Mother Attending in Tertiary Care Hospital.
- Author
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Mishu FA, Baral N, Ferdous N, Nahar S, Khan NZ, Sultana GS, and Yesmin MS
- Subjects
- Adult, Bangladesh epidemiology, Blood Glucose metabolism, Cross-Sectional Studies, Diabetes, Gestational blood, Diabetes, Gestational diagnosis, Female, Glucose Tolerance Test, Humans, Mothers, Pregnancy, Pregnancy Trimester, Second, Pregnancy Trimester, Third, Tertiary Care Centers, Asian People statistics & numerical data, Creatinine blood, Diabetes, Gestational ethnology, Uric Acid blood
- Abstract
The hyperuricaemia in Gestational diabetes mellitus has been explained to be a component of the metabolic syndrome which reflects insulin resistance and it has been shown to have a positive correlation with the creatinine levels. Gestational hyperuricaemia was found to be significantly associated with a high rate of maternal and foetal complications along with proteinuria and hypertension. Aimed of this study was to evaluate the serum creatinine and uric acid levels in Bangladeshi women with GDM in their second and third trimester of pregnancy. This descriptive cross sectional study was conducted at Mymensingh Medical College Hospital (MMCH), Mymensingh, Bangladesh from July 2013 to June 2014. Pregnant women, in their second and third trimester, attending the outpatient department of Obstetrics and Gynecology and the Department of Endocrinology, MMCH, Mymensingh, Bangladesh were enrolled by purposive sampling technique. GDM was diagnosed on the basis of oral glucose tolerance test (OGTT) as outlined in UN agency WHO criteria 2013. Out of 172 participants, 86 had GDM (Case) and 86 were normoglycemic (control). The mean age of GDM and control groups was 28.6±3.2 and 27.3±3.1 years respectively. The BMI was 26.4±1.5 kg/m² and 26.3±1.3 kg/m². In this study we found serum creatinine levels in GDM cases were significantly (p<0.001) increased in both trimesters (1.09±0.16mg/dl and 1.07±0.11mg/dl) compared to those without GDM (0.69±0.16mg/dl and 0.64±0.15mg/dl). Serum uric acid levels in GDM and without GDM in 2nd trimester were (4.47±0.42mg/dl and 4.43±0.63mg/dl respectively) had (p>0.05) no significant difference. Serum uric acid levels in GDM cases were significantly (p<0.001) higher in third trimesters (4.48±0.41mg/dl) compared to those without GDM (3.52±0.74mg/dl). There was distinct alteration of serum creatinine and uric acid levels in GDM compared to normal pregnancy.
- Published
- 2019
45. Response to "Managing autism spectrum disorder in developing countries by utilizing existing resources: A perspective from Bangladesh".
- Author
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Khan NZ and McConachie H
- Subjects
- Bangladesh, Developing Countries, Humans, Autism Spectrum Disorder
- Published
- 2019
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- View/download PDF
46. Technical challenges in generalizing calibration techniques for breast density measurements.
- Author
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Fowler EEE, Smallwood AM, Khan NZ, Kilpatrick K, Sellers TA, and Heine J
- Subjects
- Calibration, Humans, Image Processing, Computer-Assisted, Mammography instrumentation, Breast Density, Mammography methods
- Abstract
Purpose: We are developing a calibration methodology for full-field digital mammography (FFDM). Calibration compensates for image acquisition technique influences on the pixel representation, ideally producing improved inter-image breast density estimates. This approach relies on establishing references with rigid breast tissue-equivalent phantoms (BTEs) and requires an accurate estimate of the compressed breast thickness because the system readout is nominal. There is also an attenuation mismatch between adipose breast tissue and the adipose BTE that was noted in our previous work. It is referred to as the "attenuation anomaly" and addressed in this report. The objectives are to evaluate methods to correct for the compressed breast thickness and compensate for the attenuation anomaly., Methods: Thickness correction surfaces were established with a deformable phantom (DP) using both image and physical measurements for three direct x-ray conversion FFDM units. The Cumulative Sum serial quality control procedure was established to ensure the thickness correction measurements were stable over time by imaging and calibrating DPs biweekly in lieu of physical measurements. The attenuation anomaly was addressed by evaluating adipose image regions coupled with an optimization technique to adjust the adipose calibration data. We compared calibration consistency across matched left and right cranial caudal (CC) mammographic views (n = 199) with and without corrections using Bland-Altman plots. These plots were complemented by comparing the right and left breast calibrated average (μ
a ) and population distribution mean (ma ) with 95% confidence intervals and difference distribution variances with the F-test for uncorrected and corrected data., Results: Thickness correction surfaces were well approximated as tilted planes and were dependent upon compression force. A correction was developed for the attenuation anomaly. All paddles (large and small paddles for all units) exhibited similar tilt as a function of force. Without correction, ma = 0.92 (-1.77, 3.62) was not significantly different from zero with many negative μa samples. The thickness correction produced a significant shift in the μa distribution in the positive direction with ma = 13.99 (11.17, 16.80) and reduced the difference distribution variance significantly (P < 0.0001). Applying both corrections in tandem gave ma = 22.83 (20.32, 25.34), representing another significant positive shift in comparison with the thickness correction in isolation. Thickness corrections were stable over approximately a 2-year timeframe for all units., Conclusion: These correction techniques are valid approaches for addressing technical problems with calibration that relies on reference phantoms. The efficacy of the calibration methodology will require validation with clinical endpoints in future studies., (© 2018 The Authors. Medical Physics published by Wiley Periodicals, Inc. on behalf of American Association of Physicists in Medicine.)- Published
- 2019
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47. Estimation of Serum Zinc, Copper and Magnesium Levels in Bangladeshi women with Gestational Diabetes Mellitus Attending in a Tertiary Care Hospital.
- Author
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Mishu FA, Boral N, Ferdous N, Nahar S, Sultana GS, Yesmin MS, and Khan NZ
- Subjects
- Adult, Bangladesh epidemiology, Case-Control Studies, Cross-Sectional Studies, Diabetes, Gestational blood, Diabetes, Gestational diagnosis, Female, Humans, Pregnancy, Pregnancy Trimester, Second, Pregnancy Trimester, Third, Tertiary Care Centers, Asian People statistics & numerical data, Copper blood, Diabetes, Gestational ethnology, Magnesium blood, Zinc blood
- Abstract
Zinc (Zn), Copper (Cu) and Magnesium (Mg) are essential trace elements for normal embryogenesis and fetal growth. Alteration of Zn, Cu and Mg concentrations in blood has been observed in normal pregnancy as well as in gestational diabetes mellitus (GDM). Aim of this study was to evaluate the serum Zn, Cu and Mg levels in Bangladeshi women with GDM in their second and third trimester of pregnancy. This descriptive cross sectional study was conducted at Mymensingh Medical College Hospital (MMCH), Mymensingh, Bangladesh from July 2013 to June 2014. Pregnant women, in their second and third trimester, attending the outpatient department of Obstetrics and Gynecology and the Department of Endocrinology of MMCH were enrolled by purposive sampling technique. GDM was diagnosed on the basis of oral glucose tolerance test (OGTT) as defined in WHO criteria 2013. Out of 172 participants, 86 had GDM (Case) and 86 were normoglycemic (control). The mean age of GDM and control groups was 28.6±3.2 years and 27.3±3.1 years respectively. The BMI was 26.4±1.5kg/m² and 26.3±1.3kg/m². In this study we found serum Zn levels in GDM cases were significantly (p<0.001) low in both trimesters (43.93±5.48μg/dl and 46.86±3.12μg/dl) compared to those without GDM (67.30±7.81μg/dl and 67.58±9.12μg/dl). On the contrary, serum Cu levels in GDM cases were significantly (p<0.001) higher in both trimesters (224±3.8μg/dl and 243.91±6.9μg/dl) compared to those without GDM (220.1±7.6μg/dl and 234.9±4.6μg/dl). There was significant (p<0.001) increase of serum Cu levels in 3rd trimester compared to 2nd trimester in both GDM and non GDM cases. Serum Mg level was significantly low (p<0.001) in 2nd and 3rd trimesters in GDM cases (1.39±0.26mg/dl and 0.93±0.15mg/dl) compared to control group (1.67±0.30mg/dl and 1.67±0.31mg/dl). There was distinct alteration of serum Zn, Cu and Mg levels in GDM compared to normal pregnancy.
- Published
- 2019
48. Displaced Rohingya children at high risk for mental health problems: Findings from refugee camps within Bangladesh.
- Author
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Khan NZ, Shilpi AB, Sultana R, Sarker S, Razia S, Roy B, Arif A, Ahmed MU, Saha SC, and McConachie H
- Subjects
- Adolescent, Bangladesh epidemiology, Child, Child Development, Child, Preschool, Female, Health Services Research, Health Surveys, Humans, Infant, Infant, Newborn, Male, Mental Disorders diagnosis, Mental Disorders therapy, Myanmar ethnology, Needs Assessment, Psychological Trauma diagnosis, Psychological Trauma therapy, Social Environment, Stress Disorders, Post-Traumatic diagnosis, Stress Disorders, Post-Traumatic therapy, Health Services Accessibility statistics & numerical data, Mental Disorders epidemiology, Psychological Trauma epidemiology, Refugee Camps, Refugees psychology, Refugees statistics & numerical data, Stress Disorders, Post-Traumatic epidemiology, Vulnerable Populations psychology
- Abstract
Background: The 2017 political violence against the Rohingya people in the state of Rakhine resulted in a large influx of displaced populations into Bangladesh. Given harsh conditions and experiences in Myanmar, and the harrowing journey to the border, raised levels of child neurodevelopmental disorders (NDDs) and mental health problems were expected., Methods: A team of child development professionals, physicians, psychologists, and developmental therapists screened 622 children in clinics within the refugee camps using the Developmental Screening Questionnaire (DSQ; 0-<2 years), and the Ten Questions Plus (TQP) for NDDs, and Strengths and Difficulties Questionnaire (SDQ; 2-16 years) for mental health problems. Any child positive on the DSQ or the TQP was assessed for NDDs., Results: Only 4.8% children aged 0-<2 years and 7.3% children aged >2-16 years screened positive for NDDs, comparable with a local Bangladesh population. However, 52% of children were in the abnormal range for emotional symptoms on the SDQ, and 25% abnormal for peer problems. Significant risk factors were being parentless and having lost one or more family members in the recent crisis., Conclusions: This screening study provides objective evidence of the urgent need for psychosocial support of Rohingya children within camps, with special attention to those without parents, including monitoring of their well-being and counselling of families and other care providers., (© 2018 John Wiley & Sons Ltd.)
- Published
- 2019
- Full Text
- View/download PDF
49. Community-based parent-delivered early detection and intervention programme for infants at high risk of cerebral palsy in a low-resource country (Learning through Everyday Activities with Parents (LEAP-CP): protocol for a randomised controlled trial.
- Author
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Benfer KA, Novak I, Morgan C, Whittingham K, Khan NZ, Ware RS, Bell KL, Bandaranayake S, Salt A, Ghosh AK, Bhattacharya A, Samanta S, Moula G, Bose D, Tripathi S, and Boyd RN
- Subjects
- Developing Countries, Double-Blind Method, Environment, Health Resources, Humans, India, Infant, Outcome Assessment, Health Care, Parents education, Pragmatic Clinical Trials as Topic, Cerebral Palsy therapy, Community Health Services organization & administration, Early Medical Intervention methods, Goals
- Abstract
Introduction: Cerebral palsy (CP) is the most common childhood physical disability, with 80% estimated to be in low-middle-income countries. This study aims to (1) determine the accuracy of General Movements (GMs)/Hammersmith Infant Neurological Examination (HINE) for detecting CP at 18 months corrected age (CA); (2) determine the effectiveness of a community-based parent-delivered early intervention for infants at high risk of CP in West Bengal, India (Learning through Everyday Activities with Parents for infants with CP; LEAP-CP)., Methods: This study comprises two substudies: (1) a study of the predictive validity of the GMs and HINE for detecting CP; (2) randomised, double-blinded controlled trial of a novel intervention delivered through peer trainers (Community Disability Workers, CDW) compared with health advice (15 fortnightly visits). 142 infants at high risk of CP ('absent fidgety' GMs; 'high risk score' on HINE) aged 12-40 weeks CA will be recruited to the intervention substudy, with infants randomised based on a computer-generated sequence. Researchers will be masked to group allocation, and caregivers and CDWs naïve to intervention status. Visits will include therapeutic modules (goal-directed active motor/cognitive strategies and LEAP-CP games) and parent education. Health advice is based on the Integrated Management of Childhood Illness, WHO. Infants will be evaluated at baseline, post intervention and 18 months CA. The primary hypothesis is that infants receiving LEAP-CP will have greater scaled scores on the Pediatric Evaluation of Disability Inventory-Computer Adaptive Test (mobility domain) at 18 months compared with health advice. Secondary outcomes include infant functional motor, cognitive, visual and communication development; infant growth; maternal mental health., Ethics and Dissemination: This study is approved through appropriate Australian and Indian ethics committees (see in text) with families providing written informed consent. Findings from this trial will be disseminated through peer-reviewed journal publications and conference presentations., Trial Registration Number: 12616000653460p; Pre-results., Competing Interests: Competing interests: ST is the Data Safety Monitoring Representative and also a member of the Apollo Gleneagles Hospital Ethics Committee., (© Article author(s) (or their employer(s) unless otherwise stated in the text of the article) 2018. All rights reserved. No commercial use is permitted unless otherwise expressly granted.)
- Published
- 2018
- Full Text
- View/download PDF
50. Dynamin-Like Proteins Are Potentially Involved in Membrane Dynamics within Chloroplasts and Cyanobacteria.
- Author
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Jilly R, Khan NZ, Aronsson H, and Schneider D
- Abstract
Dynamin-like proteins (DLPs) are a family of membrane-active proteins with low sequence identity. The proteins operate in different organelles in eukaryotic cells, where they trigger vesicle formation, membrane fusion, or organelle division. As discussed here, representatives of this protein family have also been identified in chloroplasts and DLPs are very common in cyanobacteria. Since cyanobacteria and chloroplasts, an organelle of bacterial origin, have similar internal membrane systems, we suggest that DLPs are involved in membrane dynamics in cyanobacteria and chloroplasts. Here, we discuss the features and activities of DLPs with a focus on their potential presence and activity in chloroplasts and cyanobacteria.
- Published
- 2018
- Full Text
- View/download PDF
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