108 results on '"Elshall A"'
Search Results
2. Cicer arietinum phytosome ameliorates hepatosteatosis via downregulation of fatty acid synthase and stearoyl-CoA desaturase 1 in rats
- Author
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Amany A. Sayed, Amel M. Soliman, Alaa S. Elshall, and Mohamed Marzouk
- Subjects
Hepatosteatosis ,Cicer arietinum-enriched PUFA ,Cicer arietinum-enriched PUFA phytosome ,Fatty acid synthase (FAS) ,Oxidative stress ,Stearoyl-CoA desaturase 1 (SCD-1) ,Zoology ,QL1-991 - Abstract
Abstract Background Hepatosteatosis is considered a universal problematic health due to bad lifestyle. Thereby, the current study evaluates the influence of the Cicer arietinum polyunsaturated fatty acids (CAP) and newly synthesized C. arietinum polyunsaturated fatty acids phytosome (CAPP) against non-alcoholic fatty liver disease (NAFLD) persuaded through a high-fat diet (HFD) in addition to tamoxifen (TAM) in male albino rats. Forty-eight rats were separated into eight groups (6 rats/group). Rats of the control group were administered distilled water for 45 consecutive days, while phosphatidyl choline (PC), CAP, and CAPP groups administered distilled water (15 days), afterward administered PC, CAP, and CAPP, respectively (500 mg/kg b.wt), orally for 30 days. All the previous groups fed normal diet for the 45 days, while NAFLD rats feed HFD for 45 days and receive TAM (200 mg/kg b.wt, i.p) daily for 15 days, followed by administration of vehicle, PC, CAP, and CAPP orally for another 30 days. Results Hepatosteatosis was appraised biochemically by significant increase in the concentrations of serum AST, ALT, γGT, LDH, ALP, total bilirubin, total lipid, triglycerides, fatty acid synthase (FAS), stearoyl-CoA desaturase 1 (SCD-1), and LDL-cholesterol, as well as hepatic total lipids and triglycerides. In addition, a significant decline in serum total protein, albumin, and HDL-cholesterol concentrations was observed in comparison with the control group. NAFLD induces oxidative stress by noteworthy increase in hepatic MDA, H2O2, and meaningful reduction in hepatic GSH, SOD, GST, GRD, and CAT levels as compared with the corresponding control group. Liver histological changes were noted in the NAFLD group as compared to the control. Interestingly, CAP and CAPP treatments modulate the abnormal effects of NAFLD in all the previous parameters. For the histological changes caused by NAFLD, the liver tissue appeared nearly normal after the treatment with CAP and CAPP. Conclusion CAP and CAPP administration may have a potential role in alleviating hepatosteatosis. This may relate to its downregulation against FAS, SCD-1, and oxidative stress.
- Published
- 2024
- Full Text
- View/download PDF
3. SPOTLIGHT : Co-Production of Knowledge at Sumida Farm Trains a New Generation of Community-Engaged Scientists
- Author
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Engels, Jennifer, Bruno, Barbara C., Suzuki, Emi, Suzuki, Kyle, Dulai, Henrietta, Manning, Mackenzie, Viviani, Donn, Keliipuleole, Keku‘iapōiula, Cruz, Brandon Dela, Ho, Kathy, Kila, Kyle, Malterre, Tehani, Thepsenavong, Ariel, Bremer, Leah, Wada, Christopher, Watson, Sheree, Elshall, Ahmed S., Arik, Aida D., and Burnett, Kimberly
- Published
- 2024
4. Integrated GIS-hydrologic-hydraulic modeling to assess combined flood drivers in coastal regions: a case study of Bonita Bay, Florida
- Author
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Seneshaw Tsegaye, Mebrahtom G. Kebedew, Kevin K. Albrecht, Thomas M. Missimer, Serge Thomas, and Ahmed S. Elshall
- Subjects
combined factor flooding assessment ,sea level rise ,groundwater table rise ,impervious surfaces ,StormWise and GIS modeling ,hydrology-hydraulic modeling ,Environmental technology. Sanitary engineering ,TD1-1066 - Abstract
Flooding poses a severe global threat, necessitating advanced methodologies to assess and manage its risks effectively. This study introduces a novel approach that integrates Geographic Information System (GIS) with hydrologic-hydraulic modeling to evaluate the combined drivers of current and future flood risks. The method is applied to the development Bonita Bay in southwest Florida. It occurs in a region highly susceptible to flooding due to its low elevation and proximity to tidal waters. The innovative integration of GIS with hydrologic-hydraulic models enables detailed assessment and visualization of flood inundation areas under multiple flood drivers including design storms, land use changes, groundwater rise, and sea-level rise. This allows for the seamless simulation of complex flood interactions with only minor adjustments to the model for the identified drivers. The results indicate significant increases in initial water storage caused by sea and groundwater level rise and amplified storm runoff from land use changes. A 2% increase in flooded areas is projected with stronger design storms, and a 5% increase by 2,100 compared to 2024. This approach provides a robust framework for developing tailored flood mitigation strategies and can be adapted to various coastal regions globally.
- Published
- 2024
- Full Text
- View/download PDF
5. Evaluation of a novel homemade sandwich ELISA and lateral flow assays conjugated with gold-nanoparticles for detection of human fascioliasis antigens
- Author
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Mahmoud Elshall, Ibrahim Shalash, and Alaa Samn
- Subjects
diagnosis of fasciola gigantica ,gold nanoparticles aunps ,sandwich elisa ,immunochromatography lateral flow strip lfa ,covalent conjugation of aunps ,Infectious and parasitic diseases ,RC109-216 - Abstract
Background and rationale: Fascioliasis is a neglected parasitic infection that affects both humans and animals. It is caused by the trematode parasites known as Fasciola hepatica and Fasciola gigantica, which primarily infect the bile duct. Fascioliasis has a significant negative social and economic impact, with estimated infected rate in livestock (18%) and 2.6 million persons worldwide. The highly prevalence was recorded in least developed countries. The actual challenge is to obtain a cheap and efficient diagnosis technique to diagnose the early mild stage of fascioliasis, parasitological examination techniques are usually effective in the final stage of infection when a large number of fascioliasis eggs are execrated in stool. Aim: The aim of this study was conducted to develop and compare a novel diagnostic lateral flow assay and sandwich ELISA for detection of active fascioliasis infection. The conjugation of fascioliasis tegumental antibodies to AuNPs through covalent conjugation using EDC/Sulfo-NHS, to application in the setup of immuno-chromatography lateral flow assay (LFA) and sandwich ELISA. The novel LFA succeeded to diagnose (37 out of 38 true positive infected fascioliasis group), (2 out of 81 true negative other parasites infected group) and (0 out of 27 negative control group), the sensitivity, specificity, NPV and PPV of were 97.4%, 98.2%, 99.1%, and 94.8%, respectively. while the sensitivity, specificity, NPV and PPV of sandwich ELISA were 94.7%, 96.3%, 98.1%, and 90%, respectively. Conclusion: The higher sensitivity and specificity were recorded in LFA. Lateral flow assays (LFA) technique could be used as Ideal diagnostic techniques in monitoring and control of fasciolosis infection.
- Published
- 2024
- Full Text
- View/download PDF
6. Application of National Education Technology Standards as Perceived by Nursing Students and Its Relation to Their Problem Solving Skill during COVID-19 Disaster
- Author
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Ghazala, Ayat Fawzy and Elshall, Shimaa Ebrahim
- Abstract
With the emergence of COVID 19 disaster, dependence on technological and electronic learning is increasing. National Education technology standard has a great impact on improving students' skills. One of these skills is problem solving which is very crucial to nurse student to be prepared to be professional nurse. This study sought to assess application of national education technology standards as perceived by nursing students and its relation to their problem solving skill during COVID 19 disaster. The study adopted a descriptive correlational design using a convenience sample (N = 218) of all fourth nursing students who accept to participate in the study at Faculty of Nursing, Menoufia University. The instruments used to gather the data were developed questionnaire by researchers to assess application of national education technology standards, and problem solving skill questionnaire. The results show that the majority of nursing students have high level of perception regarding application of these standards. Moreover, the high percentage of nursing students had high level problem solving skill, and there was a positive moderate correlation between total score national education technology standards, and total score problem solving skill. Based on the findings, it is very important to ensure application of national education technology standards for teaching staff and administrative system. Moreover, Periodic updates and training on the new changes in education technology for both nursing students and teaching staff.
- Published
- 2021
7. Application-specific optimal model weighting of global climate models: A red tide example
- Author
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Elshall, Ahmed, Ye, Ming, Kranz, Sven A., Harrington, Julie, Yang, Xiaojuan, Wan, Yongshan, and Maltrud, Mathew
- Published
- 2022
- Full Text
- View/download PDF
8. Urinary C-peptide and urinary C-peptide creatinine ratio as markers for insulin resistance in obese children and adolescents
- Author
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Hassan, Ahmed Arafa, Elshall, Sara, Erfan, Adel, Hafez, Mona, Salah, Wesam, Elrifaey, Shaymaa, and El Amrousy, Doaa
- Published
- 2022
- Full Text
- View/download PDF
9. Ex vivo permeation parameters and skin deposition of melatonin-loaded microemulsion for treatment of alopecia
- Author
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Asmaa A. Elshall, Amira M. Ghoneim, Heidi M. Abdel-Mageed, Rihab Osman, and Dalia S. Shaker
- Subjects
Melatonin ,Microemulsion ,Transdermal ,Androgenic alopecia ,Topical ,Therapeutics. Pharmacology ,RM1-950 ,Pharmacy and materia medica ,RS1-441 - Abstract
Abstract Background Melatonin (MEL) is a powerful antioxidant molecule with anti-androgenic property. A microemulsion (ME) system loaded with MEL was designed for treatment of androgenic alopecia. Pseudo-ternary phase diagram was constructed, and ME formulae were developed using coconut oil, Tween 80 and PEG 400. In the present study, MEL ME was characterized and evaluated for droplet size, polydispersity index, zeta potential, morphology using TEM imaging. MEL ex vivo permeation study through rat skin followed by tape stripping for stratum corneum (SC) was performed for different ME formulae, to determine skin permeation parameters and detect SC-MEL deposition. Results Spherical and uniform particles of MEL-loaded microemulsion were formulated with high stability. In ex vivo permeation study, MEL ME exhibited low steady-state skin flux along with pronounced SC deposition which prevailed a controlled release manner. Conclusion The results suggested that MEL ME could be a promising candidate for further permeation and in vivo studies for androgenic alopecia treatment.
- Published
- 2022
- Full Text
- View/download PDF
10. Cicer arietinum phytosome ameliorates hepatosteatosis via downregulation of fatty acid synthase and stearoyl-CoA desaturase 1 in rats.
- Author
-
Sayed, Amany A., Soliman, Amel M., Elshall, Alaa S., and Marzouk, Mohamed
- Abstract
Background: Hepatosteatosis is considered a universal problematic health due to bad lifestyle. Thereby, the current study evaluates the influence of the Cicer arietinum polyunsaturated fatty acids (CAP) and newly synthesized C. arietinum polyunsaturated fatty acids phytosome (CAPP) against non-alcoholic fatty liver disease (NAFLD) persuaded through a high-fat diet (HFD) in addition to tamoxifen (TAM) in male albino rats. Forty-eight rats were separated into eight groups (6 rats/group). Rats of the control group were administered distilled water for 45 consecutive days, while phosphatidyl choline (PC), CAP, and CAPP groups administered distilled water (15 days), afterward administered PC, CAP, and CAPP, respectively (500 mg/kg b.wt), orally for 30 days. All the previous groups fed normal diet for the 45 days, while NAFLD rats feed HFD for 45 days and receive TAM (200 mg/kg b.wt, i.p) daily for 15 days, followed by administration of vehicle, PC, CAP, and CAPP orally for another 30 days. Results: Hepatosteatosis was appraised biochemically by significant increase in the concentrations of serum AST, ALT, γGT, LDH, ALP, total bilirubin, total lipid, triglycerides, fatty acid synthase (FAS), stearoyl-CoA desaturase 1 (SCD-1), and LDL-cholesterol, as well as hepatic total lipids and triglycerides. In addition, a significant decline in serum total protein, albumin, and HDL-cholesterol concentrations was observed in comparison with the control group. NAFLD induces oxidative stress by noteworthy increase in hepatic MDA, H
2 O2 , and meaningful reduction in hepatic GSH, SOD, GST, GRD, and CAT levels as compared with the corresponding control group. Liver histological changes were noted in the NAFLD group as compared to the control. Interestingly, CAP and CAPP treatments modulate the abnormal effects of NAFLD in all the previous parameters. For the histological changes caused by NAFLD, the liver tissue appeared nearly normal after the treatment with CAP and CAPP. Conclusion: CAP and CAPP administration may have a potential role in alleviating hepatosteatosis. This may relate to its downregulation against FAS, SCD-1, and oxidative stress. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
11. Integrated GIS-hydrologic-hydraulic modeling to assess combined flood drivers in coastal regions: a case study of Bonita Bay, Florida.
- Author
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Tsegaye, Seneshaw, Kebedew, Mebrahtom G., Albrecht, Kevin K., Missimer, Thomas M., Thomas, Serge, and Elshall, Ahmed S.
- Subjects
TIDE-waters ,GEOGRAPHIC information systems ,RUNOFF ,ABSOLUTE sea level change ,SEA level - Abstract
Flooding poses a severe global threat, necessitating advanced methodologies to assess and manage its risks effectively. This study introduces a novel approach that integrates Geographic Information System (GIS) with hydrologic-hydraulic modeling to evaluate the combined drivers of current and future flood risks. The method is applied to the development Bonita Bay in southwest Florida. It occurs in a region highly susceptible to flooding due to its low elevation and proximity to tidal waters. The innovative integration of GIS with hydrologic-hydraulic models enables detailed assessment and visualization of flood inundation areas under multiple flood drivers including design storms, land use changes, groundwater rise, and sea-level rise. This allows for the seamless simulation of complex flood interactions with only minor adjustments to the model for the identified drivers. The results indicate significant increases in initial water storage caused by sea and groundwater level rise and amplified storm runoff from land use changes. A 2% increase in flooded areas is projected with stronger design storms, and a 5% increase by 2,100 compared to 2024. This approach provides a robust framework for developing tailored flood mitigation strategies and can be adapted to various coastal regions globally. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
12. LVNC or hyper-trabeculated LV, are we missing something?
- Author
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Ahmed, E, primary, Mahfouz, A, additional, Hammouda, T, additional, Nasr, A, additional, Abdelfattah, M A H, additional, Wanees, M O S, additional, Elshall, A H M, additional, Shaaban, M A H, additional, and Kamel, O, additional
- Published
- 2024
- Full Text
- View/download PDF
13. Prescreening-Based Subset Selection for Improving Predictions of Earth System Models With Application to Regional Prediction of Red Tide
- Author
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Ahmed S. Elshall, Ming Ye, Sven A. Kranz, Julie Harrington, Xiaojuan Yang, Yongshan Wan, and Mathew Maltrud
- Subjects
regional environmental management ,harmful algae blooms of red tide ,climate models and Earth system models ,HighResMIP of CMIP6 ,multi-model ensemble methods ,sub-ensemble selection and subset selection ,Science - Abstract
We present the ensemble method of prescreening-based subset selection to improve ensemble predictions of Earth system models (ESMs). In the prescreening step, the independent ensemble members are categorized based on their ability to reproduce physically-interpretable features of interest that are regional and problem-specific. The ensemble size is then updated by selecting the subsets that improve the performance of the ensemble prediction using decision relevant metrics. We apply the method to improve the prediction of red tide along the West Florida Shelf in the Gulf of Mexico, which affects coastal water quality and has substantial environmental and socioeconomic impacts on the State of Florida. Red tide is a common name for harmful algal blooms that occur worldwide, which result from large concentrations of aquatic microorganisms, such as dinoflagellate Karenia brevis, a toxic single celled protist. We present ensemble method for improving red tide prediction using the high resolution ESMs of the Coupled Model Intercomparison Project Phase 6 (CMIP6) and reanalysis data. The study results highlight the importance of prescreening-based subset selection with decision relevant metrics in identifying non-representative models, understanding their impact on ensemble prediction, and improving the ensemble prediction. These findings are pertinent to other regional environmental management applications and climate services. Additionally, our analysis follows the FAIR Guiding Principles for scientific data management and stewardship such that data and analysis tools are findable, accessible, interoperable, and reusable. As such, the interactive Colab notebooks developed for data analysis are annotated in the paper. This allows for efficient and transparent testing of the results’ sensitivity to different modeling assumptions. Moreover, this research serves as a starting point to build upon for red tide management, using the publicly available CMIP, Coordinated Regional Downscaling Experiment (CORDEX), and reanalysis data.
- Published
- 2022
- Full Text
- View/download PDF
14. Comparative study between intrathecal dexmedetomidine and intrathecal magnesium sulfate for the prevention of post-spinal anaesthesia shivering in uroscopic surgery; (RCT)
- Author
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Heba Omar, Wessam Adel Aboella, Mohammed Mahmoud Hassan, Amany Hassan, Passaint Hassan, Ahmed Elshall, Dalia Khaled, Maha Mostafa, Pierre Zarif Tawadros, Mona Hossam Eldin, Mai Wedad, and Bassant Mohamed Abdelhamid
- Subjects
Dexmedetomidine ,Magnesium ,Spinal ,Shivering ,Anesthesiology ,RD78.3-87.3 - Abstract
Abstract Background Hypothermia and shivering are common complications after spinal anaesthesia, especially after uroscopic procedures in which large amounts of cold intraluminal irrigation fluids are used. Magnesium sulfate and dexmedetomidine are the most effective adjuvants with the least side effects. The aim of this study was to compare the effects of intrathecal dexmedetomidine versus intrathecal magnesium sulfate on the prevention of post-spinal anaesthesia shivering. Methods This prospective randomized, double-blinded controlled study included 105 patients who were scheduled for uroscopic surgery at the Kasr El-Aini Hospital. The patients were randomly allocated into three groups. Group C ( n = 35) received 2.5 ml of hyperbaric bupivacaine 0.5% (12.5 mg) + 0.5 ml of normal saline, Group M ( n = 35) received 2.5 ml of hyperbaric bupivacaine 0.5% (12.5 mg) + 25 mg of magnesium sulfate in 0.5 ml saline, and Group D ( n = 35) received 2.5 ml of hyperbaric bupivacaine 0.5% (12.5 mg) + 5 μg of dexmedetomidine in 0.5 ml saline. The primary outcomes were the incidence and intensity of shivering. The secondary outcomes were the incidence of hypothermia, sedation, the use of meperidine to control shivering and complications. Results Group C had significantly higher proportions of patients who developed shivering (21), developed grade IV shivering (20) and required meperidine (21) to treat shivering than group M (8,5,5) and group D (5,3,6), which were comparable to each other. The time between block administration and meperidine administration was similar among the three groups. Hypothermia did not occur in any of the patients. The three groups were comparable regarding the occurrence of nausea, vomiting, bradycardia and hypotension. All the patients in group C, 32 patients in group M and 33 patients in group D had a sedation score of 2. Three patients in group M and 2 patients in group D had a sedation score of 3. Conclusions Intrathecal injections of both dexmedetomidine and magnesium sulfate were effective in reducing the incidence of post-spinal anaesthesia shivering. Therefore, we encourage the use of magnesium sulfate, as it is more physiologically available, more readily available in most operating theatres and much less expensive than dexmedetomidine. Trial registration Clinical trial registration ID: Pan African Clinical Trial Registry (PACTR) Trial Number PACTR201801003001727; January 2018, “retrospectively registered”.
- Published
- 2019
- Full Text
- View/download PDF
15. Bayesian inference and predictive performance of soil respiration models in the presence of model discrepancy
- Author
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A. S. Elshall, M. Ye, G.-Y. Niu, and G. A. Barron-Gafford
- Subjects
Geology ,QE1-996.5 - Abstract
Bayesian inference of microbial soil respiration models is often based on the assumptions that the residuals are independent (i.e., no temporal or spatial correlation), identically distributed (i.e., Gaussian noise), and have constant variance (i.e., homoscedastic). In the presence of model discrepancy, as no model is perfect, this study shows that these assumptions are generally invalid in soil respiration modeling such that residuals have high temporal correlation, an increasing variance with increasing magnitude of CO2 efflux, and non-Gaussian distribution. Relaxing these three assumptions stepwise results in eight data models. Data models are the basis of formulating likelihood functions of Bayesian inference. This study presents a systematic and comprehensive investigation of the impacts of data model selection on Bayesian inference and predictive performance. We use three mechanistic soil respiration models with different levels of model fidelity (i.e., model discrepancy) with respect to the number of carbon pools and the explicit representations of soil moisture controls on carbon degradation; therefore, we have different levels of model complexity with respect to the number of model parameters. The study shows that data models have substantial impacts on Bayesian inference and predictive performance of the soil respiration models such that the following points are true: (i) the level of complexity of the best model is generally justified by the cross-validation results for different data models; (ii) not accounting for heteroscedasticity and autocorrelation might not necessarily result in biased parameter estimates or predictions, but will definitely underestimate uncertainty; (iii) using a non-Gaussian data model improves the parameter estimates and the predictive performance; and (iv) accounting for autocorrelation only or joint inversion of correlation and heteroscedasticity can be problematic and requires special treatment. Although the conclusions of this study are empirical, the analysis may provide insights for selecting appropriate data models for soil respiration modeling.
- Published
- 2019
- Full Text
- View/download PDF
16. Impacts of prior parameter distributions on Bayesian evaluation of groundwater model complexity
- Author
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Samani, Saeideh, Ye, Ming, Zhang, Fan, Pei, Yong-zhen, Tang, Guo-ping, Elshall, Ahmed, and Moghaddam, Asghar A.
- Published
- 2018
- Full Text
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17. Novel expression of Cathepsin B Fasciola gigantica sequence for detection of human fascioliasis in Egypt
- Author
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I.R. Aly, R.S. Hamad, M. Elshall, and M. Ahmed
- Subjects
Infectious and parasitic diseases ,RC109-216 - Published
- 2020
- Full Text
- View/download PDF
18. Incorporating Historical Spring Discharge Protection Into Sustainable Groundwater Management: A Case Study From Pearl Harbor Aquifer, Hawai‘i
- Author
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Kimberly M. Burnett, Ahmed S. Elshall, Christopher A. Wada, Aida Arik, Aly El-Kadi, Clifford I. Voss, Jade M. S. Delevaux, and Leah L. Bremer
- Subjects
groundwater dependent ecosystems ,sustainable yield ,sustainable groundwater management ,spring discharge ,Hawai‘i state water code ,water policy ,Environmental technology. Sanitary engineering ,TD1-1066 - Abstract
Groundwater management policy around the world increasingly seeks to protect groundwater-dependent ecosystems and associated human uses and values. This includes uses of ecosystems and agricultural systems linked to natural spring discharge. Yet, there are few examples of practical tools to balance human groundwater use with ecological water demand related to spring discharge. Using a simulation optimization framework, we directly incorporate a spring discharge constraint into the analysis of sustainable yield for operationalizing groundwater policy in the state of Hawai‘i. Our application on the island of O‘ahu is a spring discharge-dependent watercress farm with historical, cultural, and ecological significance. This research provides decision-makers in Hawai‘i with information regarding the trade-off between groundwater pumping and spring discharge, which is connected to multiple benefits, including historical and cultural values in line with codified state beneficial use protections. Because this trade-off provides an important step in operationalizing sustainable yield policy in Hawai‘i, we conclude by discussing further conceptual and technical developments necessary to move groundwater policy in Hawai‘i closer to full incorporation of the public trust principles of the state water code.
- Published
- 2020
- Full Text
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19. Combined intra-cavitary course of left anterior descending artery and myocardial bridge of right coronary artery in right ventricle hypertrophy: a case report
- Author
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Hussein, Hossameldin, primary, Elshall, Ahmed, additional, Youssef, Ahmed, additional, Hekal, Soha, additional, and Shaaban, Mahmoud, additional
- Published
- 2023
- Full Text
- View/download PDF
20. Evaluation of a novel homemade sandwich ELISA and lateral flow assays conjugated with gold-nanoparticles for detection of human fascioliasis antigens.
- Author
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Elshall, Mahmoud Nady, Shalash, Ibrahim Ali, and Samn, Alaa Abdelaziz
- Subjects
FASCIOLIASIS ,GOLD nanoparticles ,ENZYME-linked immunosorbent assay ,PARASITE antigens ,DISEASE prevalence - Abstract
Background and rationale: Fascioliasis is a neglected parasitic infection that affects both humans and animals. It is caused by the trematode parasites known as Fasciola hepatica and Fasciola gigantica, which primarily infect the bile duct. Fascioliasis has a significant negative social and economic impact, with estimated infected rate in livestock (18%) and 2.6 million persons worldwide. The highly prevalence was recorded in least developed countries. The actual challenge is to obtain a cheap and efficient diagnosis technique to diagnose the early mild stage of fascioliasis, parasitological examination techniques are usually effective in the final stage of infection when a large number of fascioliasis eggs are execrated in stool. Aim: The aim of this study was conducted to develop and compare a novel diagnostic lateral flow assay and sandwich ELISA for detection of active fascioliasis infection. The conjugation of fascioliasis tegumental antibodies to AuNPs through covalent conjugation using EDC/Sulfo-NHS, to application in the setup of immuno-chromatography lateral flow assay (LFA) and sandwich ELISA. The novel LFA succeeded to diagnose (37 out of 38 true positive infected fascioliasis group), (2 out of 81 true negative other parasites infected group) and (0 out of 27 negative control group), the sensitivity, specificity, NPV and PPV of were 97.4%, 98.2%, 99.1%, and 94.8%, respectively. while the sensitivity, specificity, NPV and PPV of sandwich ELISA were 94.7%, 96.3%, 98.1%, and 90%, respectively. Conclusion: The higher sensitivity and specificity were recorded in LFA. Lateral flow assays (LFA) technique could be used as Ideal diagnostic techniques in monitoring and control of fasciolosis infection. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
21. The Effectiveness of Educational Interventions about Sustainability Development among Nursing Students
- Author
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Shimaa Ebrahim Elshall, Safia Samir Darwish, and Wafaa Mohamed Shokry
- Published
- 2022
- Full Text
- View/download PDF
22. Augmentation of Atrophic Posterior Mandible using Inlay Xenograft versus Autograft Bone Blocks
- Author
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mona sheta, mohamed shoushan, mohammed elshall, ibrahim nowair, and eman megahed
- Published
- 2022
- Full Text
- View/download PDF
23. Nurses' Proactive Behavior, Relational Coordination, and Professional identity as Predictors of Head Nurses' Relational Leadership.
- Author
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Shokry, Wafaa Mohamed, Elshall, Shimaa Ebrahim, and Darwish, Safia Samir
- Subjects
NURSING ,PROFESSIONAL identity ,LEADERSHIP ,INTENSIVE care units ,NURSE administrators - Abstract
Relational leadership skills have been acknowledged as essential of improving the performance of the health system. To keep up with the changes in healthcare, proactive behavior, relationship coordination, and professional identity are deemed to be excellent qualities that all nurses should possess. An important strategy for enhancing nurses' qualities is relational leadership. Purpose: This study aimed to assess nurses' proactive behavior, relational coordination, and professional identity as predictors of head nurses' relational leadership. Methods: A descriptive correlational design was utilized. The study was conducted at all critical care units at Emergency Menoufia University hospital. A simple random sample of one hundred nurses comprised the study 's sample. Four tools were used: the nurses' proactive behavior scale, relational coordination scale, professional identity, and head nurse's relational leadership from nurses' perspectives. Results: There was a high statistical association between relational leadership and both of proactive behavior, and the relational coordination (p<0.0001). Concerning the association of relational leadership with professional identity, it was not applicable to do statistical analysis as all nurses showed only one level of professional identity (high level). Conclusion: Based on the study findings, the predictors of head nurses' relational leadership are proactive behavior, and relational coordination. On the other hand, professional identity was excluded as a predictor. Recommendations: Enrich and update the awareness of head nurses about relational leadership via workshops and programs. Activating evidence-based research regarding nurses' proactive behavior and relational coordination in practice. Increase awareness among nurse administrators and hospital directors about relational leadership. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
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24. Groundwater sustainability: a review of the interactions between science and policy
- Author
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Ahmed S Elshall, Aida D Arik, Aly I El-Kadi, Suzanne Pierce, Ming Ye, Kimberly M Burnett, Christopher A Wada, Leah L Bremer, and Gregory Chun
- Subjects
groundwater sustainability ,science policy interface ,integrated modeling ,ecosystem services ,uncertainty analysis ,participation ,Environmental technology. Sanitary engineering ,TD1-1066 ,Environmental sciences ,GE1-350 ,Science ,Physics ,QC1-999 - Abstract
Concerns over groundwater depletion and ecosystem degradation have led to the incorporation of the concept of groundwater sustainability as a groundwater policy instrument in several water codes and management directives worldwide. Because sustainable groundwater management is embedded within integrated, co-evolving hydrological, ecological, and socioeconomic systems, implementing such policies remains a challenge for water managers and the scientific community. The problem is further exacerbated when participatory processes are lacking, resulting in a communication gap among water authorities, scientists, and the broader community. This paper provides a systematic review of the concept of groundwater sustainability, and situates this concept within the calls from the hydrologic literature for more participatory and integrated approaches to water security. We discuss the definition of groundwater sustainability from both a policy and scientific perspective, tracing the evolution of this concept from safe yield, to sustainable groundwater management. We focus on the diversity of societal values related to groundwater sustainability, and the typology of the aquifer performance and governance factors. In addition, we systematically review the main components of an effective scientific evaluation of groundwater sustainability policy, which are multi-process modeling, uncertainty analysis, and participation. We conclude that effective groundwater sustainability policy implementation requires an iterative scientific evaluation that (i) engages stakeholders in a participatory process through collaborative modeling and social learning; (ii) provides improved understanding of the coevolving scenarios between surface water-groundwater systems, ecosystems, and human activities; and (iii) acknowledges and addresses uncertainty in our scientific knowledge and the diversity of societal preferences using multi-model uncertainty analysis and adaptive management. Although the development of such a transdisciplinary research approach, which connects policy, science, and practice for groundwater sustainability evaluation, is still in its infancy worldwide, we find that research towards groundwater sustainability is growing at a much faster rate than groundwater research as a whole.
- Published
- 2020
- Full Text
- View/download PDF
25. Disaster Management Educational Intervention: A Key to Reduce Internship Nursing Students' COVID 19 Fear
- Author
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Wafaa Mohamed Shokry and Shimaa Ebrahim Elshall
- Subjects
Emergency management ,Coronavirus disease 2019 (COVID-19) ,business.industry ,education ,Significant difference ,University hospital ,Nursing ,Scale (social sciences) ,Internship ,Intervention (counseling) ,Health care ,ComputingMilieux_COMPUTERSANDEDUCATION ,business ,Psychology - Abstract
Background: COVID-19 as a disaster is attacking the world as we are in a war that produced a larger number of deaths and patients. Health care providers including internship nursing students are considered our soldiers in that war, so they shouldn't be afraid when facing any disaster. Purpose: This study aimed to evaluate the effectiveness of disaster management educational intervention on internship nursing students’ COVID - 19 Fear. Methods: Quasi-Experimental pre-test and post-test designs were conducted using one group. A convenience sample (N = 110) of internship nursing students who trained at Menoufia University hospitals and Shebin Elkom teaching hospital. Three instruments were applied, which were a Self-administered questionnaire to assess nursing intern students’ knowledge, Self-reported questionnaire to assess intern students’ practices regarding disaster management, and COVID-19 Fear scale to assess internship nursing students’ fear. Results: This study revealed that internship nursing students’ COVID-19 fear at the post- and follow up intervention was reduced. Also, there was a highly significant difference in the internship nursing students' COVID-19 fear level between pre- and post-intervention and between pre intervention and follow-up intervention at p≤ 0.001. Conclusions: The effectiveness of disaster management educational intervention had been achieved in reducing internship nursing students’ COVID-19 fear. So, intern students should be trained and equipped to deal with disaster management. Recommendation: The undergraduate and postgraduate nursing curriculum should include the discipline of disaster management and continuous, and recurrent disaster management training programs are conducted during undergraduate or graduate education to reduce COVID-19 fear.
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- 2021
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26. Effects of land-cover and watershed protection futures on sustainable groundwater management in a heavily utilized aquifer in Hawai‘i (USA)
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Ahmed S. Elshall, Kimberly Burnett, Laura Brewington, Jade M. S. Delevaux, Aly I. El-Kadi, Christopher A. Wada, Clifford I. Voss, and Leah L. Bremer
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geography ,geography.geographical_feature_category ,Watershed ,010504 meteorology & atmospheric sciences ,0208 environmental biotechnology ,Aquifer ,02 engineering and technology ,Groundwater recharge ,01 natural sciences ,020801 environmental engineering ,Ecosystem services ,Watershed management ,Earth and Planetary Sciences (miscellaneous) ,Forest protection ,Water resource management ,Sustainable yield ,Groundwater ,0105 earth and related environmental sciences ,Water Science and Technology - Abstract
Groundwater sustainability initiatives, including sustainable yield and watershed policy protection policies, are growing globally in response to increasing demand for groundwater, coupled with concerns about the effects of climate and land-cover change on groundwater supply. Improved understanding of the impacts of watershed management on groundwater yields and management costs—particularly in the broader context of climate and land-cover change—is critical to inform these initiatives and facilitate integrated land and water management. This study develops a novel, spatially explicit groundwater hydrologic ecosystem services framework, which combines stakeholder-defined land-cover scenarios, sustainable yield estimation using a groundwater simulation optimization approach, and economic valuation, and applies it in the most heavily utilized aquifer Hawai‘i (USA). Sustainable yield estimates and resulting differences in replacement costs are estimated for six land-cover scenarios (with varying levels of urban development and watershed management) crossed with two water demand scenarios in a context of a dry future climate (Representative Concentration Pathway [RCP] 8.5 mid-century). Land-cover change is found to be an important, though less significant drive of changes in groundwater recharge than climate change. The degree of watershed protection, through preventing the spread of high-water-use, invasive plant species, is projected to be a much stronger land-cover signal than urban development. Specifically, full forest protection increases sustainable yield by 7–11% (30–45 million liters per day) and substantially decreases treatment costs compared with no forest protection. Collectively, this study demonstrates the hydrologic and economic value of watershed protection in a context of a dry future climate, providing insights for integrated land and water policy and management in Hawai‘i and other regions, particularly where species invasions threaten source watersheds.
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- 2021
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27. Response of Canola Plant (brassica napus l.) To Reducing Nitrogen Fertilizer Rates by Adding Humic Substance
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Saad A. Elshall, Khamis A. Mourad, and Elsayed A. A. Abdelraouf
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food.ingredient ,biology ,Brassica ,food and beverages ,chemistry.chemical_element ,General Medicine ,biology.organism_classification ,Nitrogen ,Animal science ,food ,Nitrogen fertilizer ,chemistry ,Yield (chemistry) ,Oil content ,Canola - Abstract
Two field experiments were carried out at Itay El-Baroud Agricultural Research Station Farm – El Behira Governorate- Egypt during two successive winter seasons of 2016 /2017 and 2017/2018 to investigate the possibility of reducing nitrogen fertilizer rates by adding humic substance (Actosol®) and their effects on growth, yield, yield components and some chemical properties of Serow 4 canola variety plants. The studied treatments consisted of seven different doses of recommended nitrogen (30 kg N / fed) with or without Actosol (6 liters / fed) as follows: 50 % nitrogen without Actosol (50 % N-Act.), 75 % nitrogen without Actosol (75 % N-Act.), 100 % nitrogen without Actosol (100 % N-Act.), zero nitrogen with Actosol (0 % N+Act.), 50 % nitrogen with Actosol (50 % N+Act.), 75 % nitrogen with Actosol (75 % N+Act.), and 100 % nitrogen with Actosol (100 % N+Act.). The experimental design was randomized complete block with three replicates. Results showed that decreasing nitrogen rates with or without humic substance (Actosol) linearly decreased plant height, number of branches and fruits/plant, 1000-seed weight, seed yield/plant, seed yield/fed and seed oil yield/fed, while it had increased, but non-significantly, seed oil content. However, application of Actosol increased all characters, except seed oil content where it had no significant effect on that trait at all studied nitrogen rates. Treatment of (75 % N+Act.) was better than (100 % N-Act.) for most studied characters. Therefore, nitrogen fertilization rate can be reduced by about 25% of the recommended by adding the recommended dose of Actosol (6 liters / fed).
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- 2021
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28. Nurses' Perception toward Talent Management and its Relationship to their Work Engagement and Retention
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Sanaa Moustafa Safan, Samia S. Elhaddad, and Shimaa Ebrahim Elshall
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Research design ,Value (ethics) ,Medical education ,business.industry ,Work engagement ,media_common.quotation_subject ,Convenience sample ,University hospital ,Perception ,Talent management ,Pharmacology (medical) ,business ,Psychology ,media_common - Abstract
Background: Talented employees create differential value and make contributions to organizations. Talent management has been advocated as an important strategy to engage and retain their employees. Purpose: The purpose of this study was to assess nurses' perception toward talent management and its relationship to their work engagement and retention. Design: A descriptive correlational research design was conducted at Menoufia University Hospital at Shebin-ELkom. Sampling: A convenience sample of 400 nurses was included in this study. Results: It was revealed that nurses had low level of perception towards talent management, more than half of the studied nurses had low work engagement levels, and also the majority of studied nurses had a low level of retention. Conclusion: There was a positive highly statistical significant correlation between nurses' perception toward talent management, their work engagement, and retention. Recommendation: Strategies and policies are required to develop the necessary vision to engage and retain talented nurses.
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- 2020
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29. The Relationship among Emotional Intelligence, Stress and Coping Strategies for Nursing Students
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Se. Elshall, Sm. El-Kholy, Ls. Dorgham, and Mea. El dahshan
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Emotional intelligence ,Stress (linguistics) ,Psychology ,Clinical psychology - Published
- 2020
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30. Reliability of Different Mandibular Radio morphometric Indices in Prediction of Osteoporosis and Osteopenia
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Osama A. Elshall and Fatma S. Youssif
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musculoskeletal diseases ,Osteopenia ,Orthodontics ,Postmenopausal women ,Panoramic radiograph ,Dual energy ,business.industry ,Osteoporosis ,medicine ,General Materials Science ,musculoskeletal system ,medicine.disease ,business - Abstract
Purpose: This study aimed to evaluate the value of quantitative and qualitative mandibular radio morphometric indices, as recorded from panoramic imaging, in prediction and diagnosis of osteoporosis and osteopenia. Materials and methods: Forty postmenopausal women their age between 45 and 65 years previously diagnosed as having osteoporosis as confirmed by DEXA scans were selected. DEXA and Orthopantomogram (OPG) were applied on all the patients. Panoramic mandibular index (PMI), Mental index (MI), gonial index (GI), and mandibular cortical index (MCI) were dignified and matched with the scores obtained from DEXA scan. Results: There was significant correlation between DEXA results with panoramic indices in the normal, osteopenia and osteoporotic groups. Conclusion: By increasing the age and the postmenopausal duration, MCW and PMI decrease, therefore, dentists and dent maxillofacial radiologists could act in a particular manner in early diagnosis of low BMD and help to refer high-danger patients for precise evaluation.
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- 2020
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31. Securing Big Data: A Survey on Security Solutions
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Hany Elshall
- Abstract
This survey paper aims to summarize and emphasize the security threats within Big Data framework, in addition, it is worth mentioning research work related to Big Data Analytics (BDA).
- Published
- 2022
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32. Earth system models for regional environmental management of red tide: Prospects and limitations of current generation models and next generation development
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Ahmed S. Elshall, Ming Ye, Sven A. Kranz, Julie Harrington, Xiaojuan Yang, Yongshan Wan, and Mathew Maltrud
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Global and Planetary Change ,Soil Science ,Environmental Chemistry ,Geology ,Pollution ,Article ,Earth-Surface Processes ,Water Science and Technology - Abstract
Earth system models (ESMs) serve as a unique research infrastructure for quality climate services, yet their application for environmental management at regional scale has not yet been fully explored. The unprecedented resolution and model fidelity of the Coupled Model Intercomparison Project Phase 6 (CMIP6) simulations, especially of the High-Resolution Model Intercomparison Project (HighResMIP) focusing on regional phenomena, offer opportunities for such applications. This article presents the first venture into using the HighResMIP simulations to tackle a regional environmental issue, the Florida Red Tide. This is a harmful algae bloom caused by the dinoflagellate Karenia brevis, a toxic single-celled microscopic protist. We use CMIP6 historical simulations to establish a causal agreement between the position of Loop Current, a warm ocean current that moves into the Gulf of Mexico, and the occurrence of K. brevis blooms on the Western Florida shelf. Results show that the high-resolution ESMs are capable of simulating the phenomena of interest (i.e., Loop Current) at the regional spatial scale with generally adequate data-model agreement in the context of the relation between Loop Current and red tide. We use this case study to elaborate on the prospects and limitations of using publicly available CMIP data for regional environmental management. We highlight the current gaps and the developmental needs for the next generation ESMs, and discuss the role of stakeholder participation in future ESMs development to facilitate the translation of scientific understanding to better inform decision-making of regional environmental management.
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- 2022
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33. Ex vivo permeation parameters and skin deposition of melatonin-loaded microemulsion for treatment of alopecia
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Elshall, Asmaa A., primary, Ghoneim, Amira M., additional, Abdel-Mageed, Heidi M., additional, Osman, Rihab, additional, and Shaker, Dalia S., additional
- Published
- 2022
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34. The Effectiveness of Educational Interventions about Sustainability Development among Nursing Students
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Ebrahim Elshall, Shimaa, primary, Samir Darwish, Safia, additional, and Mohamed Shokry, Wafaa, additional
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- 2022
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35. Prescreening-Based Subset Selection for Improving Predictions of Earth System Models With Application to Regional Prediction of Red Tide
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Elshall, Ahmed S., primary, Ye, Ming, additional, Kranz, Sven A., additional, Harrington, Julie, additional, Yang, Xiaojuan, additional, Wan, Yongshan, additional, and Maltrud, Mathew, additional
- Published
- 2022
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36. Machine learning for red tide prediction in the Gulf of Mexico along the West Florida Shelf
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Ahmed Elshall, Ming Ye, Sven Kranz, Julie Harrington, Xiaojuan Yang, Yongshan Wan, and Mathew Maltrud
- Published
- 2021
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37. Evaluation of Rhombic Three Dimensional Plate in Fixation of Displaced Low Subcondylar Mandibular Fractures
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Mohammad Shoushan, Mohammad A. Elshall, Ibrahim M. Nowair, and Mahmoud Abu Eldahab
- Subjects
Orthodontics ,Fixation (surgical) ,business.industry ,Medicine ,business - Published
- 2019
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38. Urinary C-peptide and urinary C-peptide creatinine ratio as markers for insulin resistance in obese children and adolescents
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Doaa El Amrousy, Sara Elshall, Wesam Salah, Ahmed Arafa Hassan, Shaymaa Elrifaey, Mona Hafez, and Adel Ali Erfan
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Blood Glucose ,medicine.medical_specialty ,Pediatric Obesity ,Waist ,Adolescent ,medicine.medical_treatment ,Gastroenterology ,Body Mass Index ,chemistry.chemical_compound ,Insulin resistance ,Internal medicine ,medicine ,Humans ,Insulin ,Prospective Studies ,Child ,Acanthosis nigricans ,Glycated Hemoglobin ,Creatinine ,C-Peptide ,C-peptide ,business.industry ,medicine.disease ,Obesity ,Cross-Sectional Studies ,chemistry ,Pediatrics, Perinatology and Child Health ,Glycated hemoglobin ,Insulin Resistance ,business ,Biomarkers - Abstract
BACKGROUND Obesity is associated with insulin resistance (IR). Identifying high-risk obese children affected with IR is crucial to apply preventive management. We aimed to assess the diagnostic value of urinary C-peptide (UCP) and urinary C-peptide creatinine ratio (UCPCR) to diagnose IR in obese children. METHODS This prospective cross-sectional study was performed on 60 children with obesity as the study group. Sixty healthy children of matched age and sex with normal body mass index (BMI) served as the control group. Hemostasis model for the assessment of IR (HOMA-IR), glycated hemoglobin (HbA1c), fasting blood glucose and insulin, UCP, and UCPCR were assessed in all included children. RESULTS UCP and UCPCR were significantly higher in children with obesity (2.075 ± 0.783) ng/ml, (0.200 ± 0.021) nmol/mmol compared to the control group (1.012 ± 0.465) ng/ml, (0.148 ± 0.016) nmol/mmol, respectively. Both UCP and UCPCR were positively correlated with each other and with HOMA-IR, HbA1c, acanthosis nigricans, waist circumference, and BMI. At cutoff ≥2.45, the sensitivity of UCP to diagnose IR in obese children was 71.4%. At cutoff ≥0.20, the sensitivity of UCPCR to diagnose IR in obese children was 87.6%. CONCLUSIONS UCP and UCPCR are promising surrogate markers of IR in children and adolescents with obesity. However, UCPCR is a better marker than UCP. IMPACT Obesity is associated with IR. Identifying high-risk obese children affected with IR is crucial to apply preventive management. We aimed to assess the diagnostic value of UCP and UCPCR to detect IR in obese children. To the best of our knowledge, we are the first to use UCP and UCPCR to assess IR in obese children. We found that UCP and UCPCR are practical, easy, dependable noninvasive markers to assess IR in children with obesity and could potentially be useful in epidemiological studies and clinical practice.
- Published
- 2021
39. Urinary C-peptide and urinary C-peptide creatinine ratio as markers for insulin resistance in obese children and adolescents
- Author
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Hassan, Ahmed Arafa, primary, Elshall, Sara, additional, Erfan, Adel, additional, Hafez, Mona, additional, Salah, Wesam, additional, Elrifaey, Shaymaa, additional, and El Amrousy, Doaa, additional
- Published
- 2021
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40. Disaster Management Educational Intervention: A Key to Reduce Internship Nursing Students' COVID 19 Fear
- Author
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Ebrahim Elshall, Shimaa, primary and Mohamed Shokry, Wafaa, additional
- Published
- 2021
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41. Novel expression of Cathepsin B Fasciola gigantica sequence for detection of human fascioliasis in Egypt
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Rabab S. Hamad, Ibrahim Aly, M. Elshall, and M. Ahmed
- Subjects
Microbiology (medical) ,Infectious Diseases ,biology ,Human fascioliasis ,Fasciola gigantica ,lcsh:RC109-216 ,General Medicine ,biology.organism_classification ,Molecular biology ,Cathepsin B ,Sequence (medicine) ,lcsh:Infectious and parasitic diseases - Published
- 2020
42. Bullying Protective Program and Its Effect on Self-efficacy and Self-esteem among Nursing Students
- Author
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Mervat E.A. El Dahshan, Merfat M. Atia, Nady, Sabah E., and Shimaa Ebrahim Elshall
- Subjects
education ,Bullying, Nursing students, Self-efficacy, Self-esteem - Abstract
Bullying among nurses and nursing students is a serious issue and generates a negative culture that threatens the ethics of nursing professionals and causes burnout or turnover among nurses. Hence, we must seriously consider measures to prevent it. Moreover, self-efficacy and self-esteem is crucial for the ability and performance of nursing students in the work environment. The aim of this study was to investigate the effect of applying bullying protective program on self-efficacy and self-esteem among nursing students. A quasi-experimental research design one group pre-test, post-test and follow-up test was used. All family and community health nursing students (221) who enrolled in the fourth year-second semester of the academic year (2018-2019) at the faculty of nursing who agreed to be part in this study were included. Two tools were utilized which are General Self-Efficacy Scale (GSE) and Rosenberg's Global Self-esteem Scale, in addition to program implementation. There were statistically significant differences in both self-efficacy and self-esteem levels before and after the bullying protective program. There were a highly statistical significant improvement in the different levels of both self-esteem and self-efficacy immediately after bullying protective program and after 3 months (follow-up test) among nursing students compared to before the program where (p = 0.000). Implementation of a bullying protective program has a positive effect on improving self-efficacy and self-esteem of nursing students. Nursing curricula should integrate the concept of bullying and how to confront it in a professional manner. Also, the nursing college should set policies to eradicate the occurrence of bullying in the workplace, which creates a positive influence on the learning environment and the nursing profession as a whole.
- Published
- 2020
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43. Management of fractures of anterior mandible with different fixation methods : A single institutional experience
- Author
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Mahmoud E. Khalifa, Emad F. Essa, and Mohammad A. Elshall
- Subjects
Orthodontics ,Symphysis ,Mandible Fracture ,business.industry ,medicine.medical_treatment ,Mandible ,Mandibular angle ,Fixation method ,Condyle ,medicine.anatomical_structure ,Oral and maxillofacial surgery ,medicine ,Internal fixation ,business - Abstract
Aim: To evaluate the effectiveness of various internal fixation hardware used for treatment of symphyseal and parasymphyseal mandibular fractures based on a single institution`s experience.Materials and Methods: In this retrospective clinical study, one hundred patients with fractures of the anterior region of the mandible involving both the symphysis and parasymphysis areas were included. All cases were selected from the patients` records who were treated in the oral and maxillofacial surgery department in a 4 years period extended from May 2013 to May 2017. Surgical admission notes, x-ray reports, operation records, outpatient notes, and complications were recorded. The patients were followed up periodically until a minimum of 6 weeks.Results: The distribution of fracture pattern was as follows; 53 patients with anterior mandible associated with subcondylar/condylar fractures, 31 with anterior mandible in association with mandibular angle fractures, and only 16 patients with isolated anterior mandible fracture. The majority of the fractures (40%) were treated by 2 miniplates, followed by the 3-D miniplates (17%), equal use (12% each) of (2 lag screws, 1 lag plus 1 miniplate and 1 reconstruction plate), then 1 lag screw (4%), and the least was the use of only 1 miniplate (3%).Conclusion: Proper selection of the fixation method for anterior mandibular fractures is essential to guarantee a successful treament and early restoration of function. Each method has its own advantages and disadvantages, and each case should be treated individually based on proper diagnosis and planning.
- Published
- 2018
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44. Response of Canola Plant (brassica napus l.) To Reducing Nitrogen Fertilizer Rates by Adding Humic Substance
- Author
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Mourad, Khamis A., primary, Abdelraouf, Elsayed A. A., additional, and Elshall, Saad A., additional
- Published
- 2021
- Full Text
- View/download PDF
45. Novel expression of Cathepsin B Fasciola gigantica sequence for detection of human fascioliasis in Egypt
- Author
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Aly, I.R., primary, Hamad, R.S., additional, Elshall, M., additional, and Ahmed, M., additional
- Published
- 2020
- Full Text
- View/download PDF
46. Groundwater sustainability: a review of the interactions between science and policy
- Author
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Elshall, Ahmed S, primary, Arik, Aida D, additional, El-Kadi, Aly I, additional, Pierce, Suzanne, additional, Ye, Ming, additional, Burnett, Kimberly M, additional, Wada, Christopher A, additional, Bremer, Leah L, additional, and Chun, Gregory, additional
- Published
- 2020
- Full Text
- View/download PDF
47. Incorporating Historical Spring Discharge Protection Into Sustainable Groundwater Management: A Case Study From Pearl Harbor Aquifer, Hawai‘i
- Author
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Burnett, Kimberly M., primary, Elshall, Ahmed S., additional, Wada, Christopher A., additional, Arik, Aida, additional, El-Kadi, Aly, additional, Voss, Clifford I., additional, Delevaux, Jade M. S., additional, and Bremer, Leah L., additional
- Published
- 2020
- Full Text
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48. Virtual Surgical Planning Using Stereolithographic Models for Segmental Mandibular Resection with Limited Extraoral Skin Incision versus Traditional Surgical Protocols
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A.A. Sadakah, Mohammad A. Elshall, and Ibrahim M. Nowair
- Subjects
Orthodontics ,Skin incision ,business.industry ,Mandible ,Tmj dysfunction ,030206 dentistry ,Bending of plates ,Surgical planning ,Mandibular resection ,Condyle ,03 medical and health sciences ,0302 clinical medicine ,stomatognathic system ,030220 oncology & carcinogenesis ,Medicine ,business ,Facial symmetry - Abstract
Purpose: To evaluate, both clinically and radiographically the usage of stereolithographic model with limited extraoral skin incision versus the traditional method using dry mandibles in preoperative adaptation of locking reconstruction plate for lateral mandibular continuity defects in delayed type mandibular reconstruction. Materials and methods: Sixteen patients were randomly classified into two equal groups; in which group I was the control (traditional method) and group II was the study group (new method). Group (I): 8 patients with mandibular lesions indicated for segmental mandibular resections via intraoral approach and a wide extraoral incision assisted with preoperative adaptation of the reconstruction plate on dry mandible and refined intraoperatively with the use of a plastic template. Group (II): 8 patients with mandibular lesions indicated for segmental mandibular resections via intraoral approach and with very limited extraoral incision assisted with preoperative adaptation of the reconstruction plate on the patient`s stereolithographic model. Results: The operation time, plate bending and adaptation time, the intraoperative blood loss, scar visibility, TMJ dysfunction, facial asymmetry, accurate plate adaptation, proper plate angulation, and plate over-extension especially in the proximal segment beyond the sigmoid notch, all were with statistically significant differences between both groups with better results always found in group II patients. However, no cases of tumor recurrence, plate exposure, or abnormal condylar position were recorded at the last follow up visit (6 months) in both groups. Conclusion: The use of the patient`s 3-D steriolithographic model for virtual surgical planning for segmental mandibular resection with limited skin incision has several advantages over the traditionally used method. It improves reconstruction of form and function, decreases operating room time and complications and enhances the capability to perform more accurate surgical procedures.
- Published
- 2018
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49. Incidence of inferior alveolar nerve affection with and without nerve exposure during bilateral sagittal split osteotomy
- Author
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Mohammad A. Elshall and A.A. Sadakah
- Subjects
medicine.medical_specialty ,business.industry ,Incidence (epidemiology) ,Soft tissue ,Sagittal split osteotomy ,Inferior alveolar nerve ,Discrimination testing ,Chin ,Surgery ,Dissection ,medicine.anatomical_structure ,Sensation ,Medicine ,business - Abstract
Objective: The aim of this study was to determine the presence and severity of inferior alveolar nerve (IAN) affection during bilateral sagittal split osteotomy (BSSO) in two groups of patients with and without direct exposure and visualization of the nerve during surgical procedure.Patients and Methods: In this prospective randomized clinical study, 14 patients (28 sides) indicated for BSSO were included. The sides were randomly divided into two groups with equal number of sides (14 sides). Group I with wide soft tissue dissection of the medial side of the ramus and exposure of IAN above the ligula and group II with minimal soft tissue dissection of the medial side of the ramus without exposure of IAN. For evaluation of neurosensory function of IAN, two methods were used including subjective evaluation and two-point discrimination test.Results: According to the subjective evaluation, there was a statistically significant difference between both groups in favor of group II in all follow-up recalls except in the final one at 12 months postoperatively. Considering the results of two-point discrimination test, the improvement obviously continued during the successive follow-up periods in both groups, with a statistically significant difference in favor of group II until the ninth month, and then in the last follow-up at the 12th month, the records were almost equal.Conclusion: To markedly reduce the postoperative neurosensory disturbances of IAV and to accelerate the full recovery of sensation of the lower lip and chin regions following BSSO, limited exposure and dissection of the medial soft tissues of the ramus should be practiced with avoidance of direct exposure and manipulation of IAN.
- Published
- 2018
- Full Text
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50. Making Steppingstones out of Stumbling Blocks: A Bayesian Model Evidence Estimator with Application to Groundwater Transport Model Selection
- Author
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Ahmed S. Elshall and Ming Ye
- Subjects
model selection ,lcsh:Hydraulic engineering ,010504 meteorology & atmospheric sciences ,Harmonic mean ,Geography, Planning and Development ,Monte Carlo method ,Bayesian probability ,Bayesian model averaging ,0207 environmental engineering ,02 engineering and technology ,Aquatic Science ,Bayesian inference ,01 natural sciences ,Biochemistry ,Bayesian ,lcsh:Water supply for domestic and industrial purposes ,lcsh:TC1-978 ,Statistics ,020701 environmental engineering ,groundwater transport ,0105 earth and related environmental sciences ,Water Science and Technology ,Mathematics ,lcsh:TD201-500 ,Model selection ,Bayesian model evidence ,Sampling (statistics) ,Estimator ,modeling ,marginal likelihood ,Quantitative Biology::Genomics ,Marginal likelihood ,model complexity - Abstract
Bayesian model evidence (BME) is a measure of the average fit of a model to observation data given all the parameter values that the model can assume. By accounting for the trade-off between goodness-of-fit and model complexity, BME is used for model selection and model averaging purposes. For strict Bayesian computation, the theoretically unbiased Monte Carlo based numerical estimators are preferred over semi-analytical solutions. This study examines five BME numerical estimators and asks how accurate estimation of the BME is important for penalizing model complexity. The limiting cases for numerical BME estimators are the prior sampling arithmetic mean estimator (AM) and the posterior sampling harmonic mean (HM) estimator, which are straightforward to implement, yet they result in underestimation and overestimation, respectively. We also consider the path sampling methods of thermodynamic integration (TI) and steppingstone sampling (SS) that sample multiple intermediate distributions that link the prior and the posterior. Although TI and SS are theoretically unbiased estimators, they could have a bias in practice arising from numerical implementation. For example, sampling errors of some intermediate distributions can introduce bias. We propose a variant of SS, namely the multiple one-steppingstone sampling (MOSS) that is less sensitive to sampling errors. We evaluate these five estimators using a groundwater transport model selection problem. SS and MOSS give the least biased BME estimation at an efficient computational cost. If the estimated BME has a bias that covariates with the true BME, this would not be a problem because we are interested in BME ratios and not their absolute values. On the contrary, the results show that BME estimation bias can be a function of model complexity. Thus, biased BME estimation results in inaccurate penalization of more complex models, which changes the model ranking. This was less observed with SS and MOSS as with the three other methods.
- Published
- 2019
- Full Text
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