128 results on '"A. Paneer Selvam"'
Search Results
2. Recent advancements of hydroxyapatite and polyethylene glycol (PEG) composites for tissue engineering applications – A comprehensive review
- Author
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Paneer Selvam, Sureka, Ayyappan, Sowmitha, I Jamir, Sentisenla, Sellappan, Logesh Kumar, and Manoharan, Swathy
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- 2024
- Full Text
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3. Malperfusion in acute type A aortic dissection: how we handle the challenge?
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Moorthy, Paneer Selvam Krishna and Sakijan, Abdul Samad
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- 2022
- Full Text
- View/download PDF
4. Assessment of bioavailable nitrogen and phosphorus content in the sediments of Indian mangroves
- Author
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Reddy, Yudhistir, Ganguly, Dipnarayan, Singh, Gurmeet, Prasad, Mamidala Harikrishna, Arumughan, Paneer Selvam, Banerjee, Kakolee, Kathirvel, Arumugam, Ramachandran, Purvaja, and Ramachandran, Ramesh
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- 2021
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- View/download PDF
5. Soil Fertility Evaluation to Adopt Climate-Smart Agriculture in Mambattu Village, Maduranthakam Block of Kanchipuram District, Tamil Nadu, India
- Author
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Kalpana Palani, Selva Preetha Paneer Selvam, Sathya Velusamy and Ramasubramaniyan Ramanathan Melmangalam
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soil fertility, agriculture, lean farming, climate change, sustainable agriculture ,Environmental effects of industries and plants ,TD194-195 ,Science (General) ,Q1-390 - Abstract
Assessment of soil fertility is essential to help identify strategies for sustainable agricultural production systems that decrease the negative environmental impact. The objective of this research study is to carry out a preliminary assessment of soil fertility status to adopt climate-smart agriculture to address the climate change challenges that adversely affect crop productivity and livelihoods of the farming community. The research was carried out in Mambattu village, Maduranthakam block of Kanchipuram district, Tamil Nadu. A systematic set of twenty geo-referenced soil samples were collected from the study village using GPS (Global Positioning System) and analysed for pH, EC, available macro, secondary and micronutrients to develop a credible soil fertility index (SFI). The preliminary fertility data of Mambattu village revealed that the pH of soil samples varied from acidic to alkaline with about 40% as neutral while the electrical conductivity showed non-saline and medium status of Organic Carbon (OC). The soil samples were predominantly sufficient in N and some micro nutrients (Fe, Mn), while medium in S and B and deficient in P, K, Ca, Mg, Zn and Cu. Results from initial studies indicate that practices like site specific nutrient management, green manuring, use of organic inputs, use of integrated pest management, seed treatment etc., have a high potential for implementing climate-smart agricultural technologies. Soil fertility evaluation can be an efficient tool to improve soil health which can positively impact crop productivity and be one of the important climate-smart technologies practices adopted by the farmers.
- Published
- 2021
- Full Text
- View/download PDF
6. Synthesis and characterization of conductive flexible cellulose carbon nanohorn sheets for human tissue applications
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Karthik Paneer Selvam, Taichi Nagahata, Kosuke Kato, Mayuko Koreishi, Toshiyuki Nakamura, Yoshimasa Nakamura, Takeshi Nishikawa, Ayano Satoh, and Yasuhiko Hayashi
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Carbon Nanohorns ,Cellulose ,Skin sensitization ,Composites ,Bio-compatible ,Medical technology ,R855-855.5 - Abstract
Abstract Background Conductive sheets of cellulose and carbon nanomaterials and its human skin applications are an interesting research aspect as they have potential for applications for skin compatibility. Hence it is needed to explore the effects and shed light on these applications. Method To fabricate wearable, portable, flexible, lightweight, inexpensive, and biocompatible composite materials, carbon nanohorns (CNHs) and hydroxyethylcellulose (HEC) were used as precursors to prepare CNH-HEC (Cnh-cel) composite sheets. Cnh-cel sheets were prepared with different loading concentrations of CNHs (10, 20 50,100 mg) in 200 mg cellulose. To fabricate the bio-compatible sheets, a pristine composite of CNHs and HEC was prepared without any pretreatment of the materials. Results The obtained sheets possess a conductivity of 1.83 × 10− 10 S/m and bio-compatible with human skin. Analysis for skin-compatibility was performed for Cnh-cel sheets by h-CLAT in vitro skin sensitization tests to evaluate the activation of THP-1 cells. It was found that THP-1 cells were not activated by Cnh-cel; hence Cnh-cel is a safe biomaterial for human skin. It was also found that the composite allowed only a maximum loading of 100 mg to retain the consistent geometry of free-standing sheets of
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- 2020
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7. Legislation and policy options for conservation and management of seagrass ecosystems in India
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Ramesh, R., Banerjee, K., Paneer Selvam, A., Lakshmi, Ahana, Krishnan, P., and Purvaja, R.
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- 2018
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8. Valuing the carbon sequestration regulation service by seagrass ecosystems of Palk Bay and Chilika, India
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Ganguly, D., Singh, G., Purvaja, R., Bhatta, R., Paneer Selvam, A., Banerjee, K., and Ramesh, R.
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- 2018
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9. The Anatomy of a Nonfaradaic Electrochemical Biosensor
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Stevenson, Hunter, Radha Shanmugam, Nandhinee, Paneer Selvam, Anjan, and Prasad, Shalini
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- 2018
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10. Carbon nanostructures synthesized via self-assembly (LLIP) and its application in FET.
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Paneer Selvam Karthik, Yuma Shimo, Zaw Lin, R. Venkata Krishna Rao, Xiao Gong, Mitsunobu Yoshida, Masaki Hada, Takeshi Nishikawa, Yasuhiko Hayashi, and Singh SP
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- 2016
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11. Synthesis and characterization of conductive flexible cellulose carbon nanohorn sheets for human tissue applications
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Paneer Selvam, Karthik, Nagahata, Taichi, Kato, Kosuke, Koreishi, Mayuko, Nakamura, Toshiyuki, Nakamura, Yoshimasa, Nishikawa, Takeshi, Satoh, Ayano, and Hayashi, Yasuhiko
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- 2020
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12. Correction to: Assessment of bioavailable nitrogen and phosphorus content in the sediments of Indian mangroves
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Reddy, Yudhistir, Ganguly, Dipnarayan, Singh, Gurmeet, Prasad, Mamidala Harikrishna, Arumughan, Paneer Selvam, Banerjee, Kakolee, Kathirvel, Arumugam, Ramachandran, Purvaja, and Ramachandran, Ramesh
- Published
- 2021
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13. Central retinal vein occlusion in a patient with breast carcinoma
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Madanagopalan, V. G., Paneer Selvam, V., Sarath Sivan, N. V., and Govindaraju, N. V.
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breast carcinoma ,central retinal vein occlusion ,microcytic hypochromic anemia ,Ophthalmology ,RE1-994 - Abstract
Purpose: Systemic malignancies may have ocular manifestations in the form of metastatic tumors, carcinoma associated retinopathy or central retinal vein occlusion (CRVO). Although CRVO has been mentioned in association with renal, lung, prostatic and ovarian malignancies, the association of CRVO with breast carcinoma is unreported. We report a patient with one such rare association.Methods: We describe a patient with breast carcinoma who was diagnosed to have CRVO. The history, ocular examination, retinal optical coherence tomography scan, ocular ultrasound scan, hematological profile, mammogram details and aspiration cytology description of the malignant breast lesion are reported in this article. Results: The retina showed extensive hemorrhages and dilated retinal veins. Complete hematologic evaluation revealed the presence of microcytic hypochromic anemia and increased hematocrit. These changes are possibly related to the malignant disease and might contribute to the pathogenesis of CRVO. Coclusion: This case report demonstrates the rare association between breast malignancy and CRVO.
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- 2019
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14. Distribution and dynamics of particulate organic matter in Indian mangroves during dry period
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Harikrishna Prasad Mamidala, Dipnarayan Ganguly, Purvaja Ramachandran, Yudhistir Reddy, Arumughan Paneer Selvam, Gurmeet Singh, Kakolee Banerjee, Radhakrishnan Subhadra Robin, and Ramesh Ramachandran
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Chlorophyll ,Oxygen ,Nitrogen ,Health, Toxicology and Mutagenesis ,Environmental Chemistry ,Particulate Matter ,General Medicine ,Pollution ,Carbon ,Ecosystem ,Environmental Monitoring - Abstract
The distribution and possible sources of particulate organic carbon (POC) and particulate nitrogen (PN) in seven mangroves ecosystems along the east and west coast of India were examined, to understand their contribution to coastal biogeochemistry. Suspended particulate matter (SPM) concentration in mangrove waters were about ~ 1.6-fold higher in west coast (Gulf of Kachchh (GOK), Mandovi-Zuari (MA-ZU) and Karwar-Kumta (KR-KU)], whereas the mean POC content in SPM along east coast [Sundarbans (SUN), Bhitarkanika (BHK), Coringa (COR) and Pichavaram-Muthupet (PI-MU)] was nearly two times higher than the west coast (1.97 ± 0.91% and 1.06 ± 0.29%), respectively. The results indicated that the influence of the land-based contaminants on the water quality parameters (dissolved oxygen, pH, salinity, nutrients and chlorophyll-a, etc.), which primarily regulated the distribution and transformation of organic carbon in these mangrove waters. Among the studied systems, an extremely high DOC/POC ratio (5.72 ± 1.64) with low pH and DO in COR waters clearly indicated the labile nature of the organic matter influenced by anthropogenic stress. Strong correlation between POC and PN indicated a similar origin in particulate organic matter. The ratios of POC/PN and POC/Chl-a showed significant spatial variation ranging from 5.5 to 18.7 and 126 to 1057, respectively. The results indicated that significant fraction of in-situ primary production contributed to particulate organic matter (POM) pool in all Indian mangrove waters except the GOK and the SUN waters, where sediment resuspension and mangrove derived organic matter were the dominant POM sources.
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- 2022
15. Larvicidal activity of titanium dioxide nanoparticles synthesized using Morinda citrifolia root extract against Anopheles stephensi, Aedes aegypti and Culex quinquefasciatus and its other effect on non-target fish
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Suman, Thodhal Yoganandham, Ravindranath, Radhika Rajasree Santha, Elumalai, Devan, Kaleena, Patheri Kuny, Ramkumar, Rajendiran, Perumal, Pachiappan, Aranganathan, Lakshminarayanan, and Chitrarasu, Paneer Selvam
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- 2015
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16. Malperfusion in acute type A aortic dissection: how we handle the challenge?
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Paneer Selvam Krishna Moorthy and Abdul Samad Sakijan
- Subjects
Pulmonary and Respiratory Medicine ,Surgery ,Review Article ,Cardiology and Cardiovascular Medicine - Abstract
Malperfusion syndrome (MPS) complicating acute type A aortic dissection (ATAAD) poses a continuing challenge and management dilemma for cardiovascular surgeons. MPS may involve any of the major arterial side branches resulting in myocardial, cerebral, spinal cord, visceral, and/or limb ischemia with varying frequency and severity. Despite the continuous improvement in diagnosis and management strategies for MPS with ATAAD, clinical outcomes remain poor and the optimal therapy is still debatable. The present review aimed to assess current evidence on ATAAD patients with MPS and how best to handle the challenge.
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- 2022
17. Synthesis of solvent-free conductive and flexible cellulose–carbon nanohorn sheets and their application as a water vapor sensor
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Karthik Paneer Selvam, Tomohiro Nakagawa, Tatsuki Marui, Hirotaka Inoue, Takeshi Nishikawa, and Yasuhiko Hayashi
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carbon nanohorns ,cellulose ,conductive sheets ,vapor sensor ,Materials of engineering and construction. Mechanics of materials ,TA401-492 ,Chemical technology ,TP1-1185 - Abstract
Carbon nanohorns (CNHs) are mixed with cellulose to make freestanding thin-film conductive sheets. CNHs, at different ratios (5, 10, 25, 50 wt%), form composites with cellulose (hydroxyethylcellulose). Freestanding cellulose–carbon nanohorn (CCN) sheets were fabricated using a 100 μ m-thick metal bar coater. Surfactants or any other chemical treatments to tailor the surface properties of CNHs were avoided to obtain composite sheets from pristine CNHs and cellulose. Utilizing the hygroscopic property of hydroxyethylcellulose and the electrical conductivity of CNHs paved a path to perform this experiment. The synthesis technique is simple, and the fabrication and drying of the sheets were effortless. As the loading concentration of CNH increased, the resistance, flexibility, and strength of the CCN composite sheets decreased. The maximum loading concentration possible to obtain a freestanding CCN sheet is 50 wt%. The resistance of the maximum loading concentration of CNH was 53 kΩ. The response of the CCN sheets to water vapor was 4 s and recover time was 13 s, and it is feasible to obtain a response for different concentrations of water vapor. High-resolution transmission electron microscopy, scanning electron microscopy, Fourier transform infrared spectroscopy, Raman spectroscopy, resistance measurement, tensile strength measurement, and thermogravimetric analysis were used to investigate the mechanical, morphological, electrical, and chemical properties of the CCN sheets.
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- 2020
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18. A‐Site Doped Aurivillius Layered Perovskite Thin Film (Bi 4‐x Dy x Ti 3 O 12 ) Electrode for Mercury Ions Sensor
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Gopalakrishnan Gopu, Ganesan Sivakumar, Ramaswamy Paneer Selvam, N. Anandhan, Rajendran Karkuzhali, Issac Joseph PanneerDoss, K. P. Ganesan, and Arockiam Amali Roselin
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Materials science ,biology ,Doping ,Inorganic chemistry ,chemistry.chemical_element ,General Chemistry ,biology.organism_classification ,Mercury (element) ,Ion ,Aurivillius ,chemistry ,Electrode ,Thin film ,Cyclic voltammetry ,Perovskite (structure) - Published
- 2021
19. Soil Fertility Evaluation to Adopt Climate-Smart Agriculture in Mambattu Village, Maduranthakam Block of Kanchipuram District, Tamil Nadu, India
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Ramasubramaniyan Ramanathan Melmangalam, Kalpana Palani, Sathya Velusamy, and Selva Preetha Paneer Selvam
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Science (General) ,Environmental effects of industries and plants ,Renewable Energy, Sustainability and the Environment ,business.industry ,Agroforestry ,TD194-195 ,language.human_language ,Q1-390 ,Geography ,Agriculture ,Block (telecommunications) ,Tamil ,language ,Soil fertility ,business ,soil fertility, agriculture, lean farming, climate change, sustainable agriculture ,General Environmental Science - Abstract
Assessment of soil fertility is essential to help identify strategies for sustainable agricultural production systems that decrease the negative environmental impact. The objective of this research study is to carry out a preliminary assessment of soil fertility status to adopt climate-smart agriculture to address the climate change challenges that adversely affect crop productivity and livelihoods of the farming community. The research was carried out in Mambattu village, Maduranthakam block of Kanchipuram district, Tamil Nadu. A systematic set of twenty geo-referenced soil samples were collected from the study village using GPS (Global Positioning System) and analysed for pH, EC, available macro, secondary and micronutrients to develop a credible soil fertility index (SFI). The preliminary fertility data of Mambattu village revealed that the pH of soil samples varied from acidic to alkaline with about 40% as neutral while the electrical conductivity showed non-saline and medium status of Organic Carbon (OC). The soil samples were predominantly sufficient in N and some micro nutrients (Fe, Mn), while medium in S and B and deficient in P, K, Ca, Mg, Zn and Cu. Results from initial studies indicate that practices like site specific nutrient management, green manuring, use of organic inputs, use of integrated pest management, seed treatment etc., have a high potential for implementing climate-smart agricultural technologies. Soil fertility evaluation can be an efficient tool to improve soil health which can positively impact crop productivity and be one of the important climate-smart technologies practices adopted by the farmers.
- Published
- 2021
20. Nitrogen Assessment in Indian Coastal Systems
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Ramesh, R., primary, Paneer Selvam, A., additional, Robin, R.S., additional, Ganguly, D., additional, Singh, G., additional, and Purvaja, R., additional
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- 2017
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21. Risk Factors for Sternal Wound Infection after Coronary Artery Bypass Grafting in Patients with and without Diabetes
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Masato Furui, Pau Kiew Kong, Paneer Selvam Krishna Moorthy, Chong Kee Soon, Kunwar Muhammad Aqeel Akhtar, Ahmad Mahir Shamsuddin, and Jeswant Dillon
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Treatment Outcome ,Risk Factors ,Diabetes Mellitus ,Humans ,Surgical Wound Infection ,Female ,General Medicine ,Renal Insufficiency ,Coronary Artery Bypass ,Cardiology and Cardiovascular Medicine ,Retrospective Studies - Abstract
Diabetes mellitus (DM) is a well-known risk factor for sternal wound infections (SWIs). However, SWIs are also known to occur in patients without DM. This study aimed to examine the difference in risk factors for SWIs after coronary artery bypass grafting (CABG) between non-diabetic and diabetic patients.We conducted a retrospective observational study including 6,697 patients who underwent CABG at our hospital from 2015-2018. The patients were assigned to the non-diabetic (group N, n = 2,930) or diabetic (group D, n = 3,767) group. A total of 24 potential risk factors were evaluated using univariate and multivariate analyses. Differences between superficial and deep SWIs were also examined.A total of 209 (3.1%) CABG patients, comprising 47 (22.5%) and 162 (77.5%) in groups N and D, respectively, required surgical treatment for SWIs. Univariate analyses indicated that a body mass index (BMI)25 kg/m
- Published
- 2022
22. Assessment of bioavailable nitrogen and phosphorus content in the sediments of Indian mangroves
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Paneer Selvam Arumughan, Kakolee Banerjee, Yudhistir Reddy, Arumugam Kathirvel, Purvaja Ramachandran, Gurmeet Singh, Ramesh Ramachandran, Dipnarayan Ganguly, and M.H.K. Prasad
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Nutrient cycle ,Health, Toxicology and Mutagenesis ,Phosphorus ,Regulating factors ,Sediment ,chemistry.chemical_element ,General Medicine ,010501 environmental sciences ,01 natural sciences ,Pollution ,Anoxic waters ,Nutrient ,chemistry ,Environmental chemistry ,Environmental Chemistry ,Environmental science ,Mangrove ,0105 earth and related environmental sciences ,Redfield ratio - Abstract
Efficient nutrient cycling and adequate sediment bioavailable nutrient supply are considered to be the two most important factors regulating the high productivity and subsequent carbon sequestration by mangrove ecosystems. We assessed spatial variability and the possible regulating factors of sediment bioavailable nutrients (nitrogen (N) and phosphorus (P)) and surface water-dissolved nutrients (N, P and silicate (Si)) in the five ecologically important mangrove ecosystems along the east and west coast of India during dry season. Higher bioavailable nitrogen concentrations in the sediments were recorded in Coringa mangroves (36.27 ± 14.7 μg g-1) and Bhitarkanika (18.54 ± 5.9 μg g-1) mangroves in the east coast followed by Karnataka (15.51 ± 8.26 μg g-1), Goa, (10.18 ± 9.96 μg g-1) and Kerala (6.36 ± 5.05 μg g-1) mangroves in the west coast. The dissolved inorganic nutrients in the mangrove waters ranged between 5.1 and 220.9 μmol l-1 for N and 0.07 and 3.9 μmol l-1 for P. These results indicated that terrestrial inputs, in situ remineralization and prevalent anoxic conditions regulated sediment nutrient content in these ecosystems, whereas the higher ammonium in the sediments was attributed to the greater nutrient adsorption by finer particles. The stoichiometry of the bioavailable nutrients (N, P) in the mangrove sediments deviated drastically from the Redfield ratio, and strong P limitation was recorded in most of the ecosystems. The results highlighted the potential role of sediment particle size and physiochemical (salinity and pH) properties in regulating bioavailable nutrient dynamics in mangrove sediments.
- Published
- 2021
23. Risk Factors for Sternal Wound Infection after Coronary Artery Bypass Grafting in Patients with and without Diabetes
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Furui, Masato, primary, Kong, Pau Kiew, additional, Moorthy, Paneer Selvam Krishna, additional, Soon, Chong Kee, additional, Akhtar, Kunwar Muhammad Aqeel, additional, Shamsuddin, Ahmad Mahir, additional, and Dillon, Jeswant, additional
- Published
- 2022
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24. Traditional method of fish treatment, microbial count and palatability studies on spoiled fish
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Abd Aziz, N. A., Mokhtar, S. I., Paneer Selvam, A., and Mokhtar, S. B.
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Spoiled fish ,Traditional treatment ,Rice vinegar ,Microbiology ,QR1-502 - Abstract
Aims: To evaluate the microbial count and palatability acceptance of spoiled fish after treatment with traditionally used naturalsolution.Methodology and results: To compare microbial count of spoiled fish before and after treatment with natural solution practicedby local people in Malaysia, 10 g of spoiled fish was respectively rinsed with 100 mL of 0.1% of natural solution such as Averrhoabilimbi extract, rice rinsed water, rice vinegar, Citrus aurantifolia extract, salt, flour, and Tamarindus indica extract. Flesh of fishrinsed with rice vinegar was found to be able to reduce microbial count (CFU/mL = 0.37 X 107) more than 4.5 times whencompared to spoiled fish (CFU/mL=1.67x 107). Spoiled fish that was treated with rice vinegar was prepared into a cutlet and fried.The cutlet was subjected to palatability acceptance study by a group of residents in Palm Court Condominium, Brickfields, KualaLumpur. The palatability study from the Cronbach alpha shown that the taste have the reliability of 0.802, the aroma has thereliability of 0.888, colour with the reliability of 0.772, texture or mouth feel have reliability of 0.840 and physical structure of thecutlet is 0.829.Conclusion, significance and impact of study: Treatment of spoiled fish using rice vinegar as practice by local peopletraditionally shown a significant reduction in microbial count and the vinegar-treated fish could be developed into a product that issafe and acceptable by the consumer.
- Published
- 2013
25. Mid-Term Results Comparing the Use of Artificial Chords Versus Native Chords for Mitral Valve Repair in Children
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Mohd Azhari Yakub, Jeswant Dillon, Sivakumar Sivalingam, Maruti Haranal, Pau Kiew Kong, Intan Fariza, and Paneer Selvam Krishna Moorthy
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Male ,Reoperation ,medicine.medical_specialty ,Time Factors ,Adolescent ,medicine.medical_treatment ,Mid term results ,030204 cardiovascular system & hematology ,03 medical and health sciences ,0302 clinical medicine ,Risk Factors ,medicine ,Humans ,Cardiac Surgical Procedures ,Child ,Retrospective Studies ,Mitral valve repair ,business.industry ,Infant ,Mitral Valve Insufficiency ,General Medicine ,Surgery ,Treatment Outcome ,030228 respiratory system ,Echocardiography ,Child, Preschool ,Pediatrics, Perinatology and Child Health ,Chordae Tendineae ,Mitral Valve ,Female ,Cardiology and Cardiovascular Medicine ,business ,Follow-Up Studies - Abstract
Background: Our study is aimed at evaluating the mid-term surgical outcomes of mitral valve repair in children using various chordal reconstructive procedures (autologous in situ chords or artificial chords). Methods: A retrospective analysis of 154 patients who underwent mitral valve repair using various chordal reconstructive procedures from 1992 to 2012. Patients were divided into group A and group B based on use of artificial chords and autologous in situ chords, respectively, for the repair. There were 102 (66.2%) patients in group A and 52 (33.8%) patients in group B. The mean age at repair was 11.1 ± 4.5 years. Associated cardiac anomalies were found in 94 (61%) patients. Results: The median follow-up period was 4.2 years (Interquartile range: 2.0-9.9). There were two (1.3%) early deaths and five (3.2%) late deaths. There was no significant difference in survival at 15 years between the two groups (group A: 91.8% vs group B: 95.1%; P = .66). There was no significant difference in the freedom from reoperation at 15 years between group A (79.4%) and group B (97.2%; P = .06). However, there was significant difference in freedom from valve failure between group A (56.5%) and group B (74.1%; P = .03). Carpentier functional class III and postoperative residual mitral regurgitation (2+ MR, ie, mild–moderate MR) were the risk factors for valve failure. Conclusions: Severity of the disease and its progression has profound effect on the valve repair than the technique itself. Both chordal reconstructive procedures can be used to produce satisfactory results in children.
- Published
- 2020
26. Reverse Engineering of Thin Films to Nanoparticles by Thermal Deposition for Large-Scale Production of Nanometals
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Marui Tatsuki, Zaw Lin, Yasuhiko Hayashi, Inoue Hirotaka, Karthik Paneer Selvam, and Takeshi Nishikawa
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Materials science ,Nanoparticle ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Physical synthesis ,Thin film ,Metallic thin films ,0210 nano-technology ,Metal nanoparticles ,Thermal deposition - Abstract
A simple method to synthesize metal nanoparticles (Nps) has been proposed using high vacuum thermal deposition (HVTD) by reverse engineering of thin films to Nps. Metal Nps synthesized by this technique corresponds to the top-down approach of nanomaterial synthesis from bulk metals of silver and copper wires to metal Nps. A high-vacuum thermal deposition is a commonly used technique for thin-film deposition in many applications. Synthesis of metal Nps by HVTD is simple, efficient, and can provide particle of about few tens of nanometers is effortless. A precoated thin layer of polyethylene glycol (PEG) on a glass substrate (Petri dish), is allowed deposit with a metallic thin film by thermionically evaporating bulk metal wires in high vacuum. The deposited metal thin film is removed along with the PEG coating into a liquid medium and subjected to sonication, stirring, and deoxidation. Obtaining the particle size in tens of nanometer range in one step is one projecting factor by HVTD technique. Also, providing the feasibility of reusing large particles as precursors after synthesis is a unique vantage point. The Nps were analyzed by various characterizations tools to evaluate the underlying properties.
- Published
- 2020
27. Synthesis of gold and silver nanoparticles using purified URAK
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Deepak, Venkataraman, Umamaheshwaran, Paneer Selvam, Guhan, Kandasamy, Nanthini, Raja Amrisa, Krithiga, Bhaskar, Jaithoon, Nagoor Meeran Hasika, and Gurunathan, Sangiliyandi
- Published
- 2011
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28. Access to Clean Drinking Water for All in India – A Matter of Sustainability of Technological and Other Interventions
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Padma Venkatasubramanian, Keerthi Paneer Selvam, and Abhishek Jain
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Public Private Partnership ,Corporate Social Responsibility ,drinking water management ,microbial contamination ,drinking water disinfection techniques ,Safe drinking water ,under five-year-old children diarrhea - Abstract
Close to 0.3 million children under the age of five (U5) die every year in India just due to infectious diarrhea. These children are mostly from socio-economically vulnerable communities. Drinking water that is contaminated with fecal pathogens and living in poor sanitation and hygiene (WASH) conditions are the main causes of diarrhea. Primordial preventive measures including sustained access to microbially safe drinking water, proper use of toilets and handwashing with soap can prevent these meaningless deaths. Technological and other interventions by the public and private sectors to tackle the WASH challenge have achieved commendable success in improving the WASH situation in India over the last decade. Yet, half of India’s population still does not have access to safely managed drinking water, and around the same number continues to defecate in the open. Improvement in the health outcomes including reduction in diarrheal deaths among U5 children has not been dramatic either. This article presents a snapshot of the status of drinking water quality and the prevalence of diarrhea among U5 children in India. The appropriateness of some of the commonly used drinking water disinfection technologies for the vulnerable population has been assessed. While providing clean water through concerted public and private interventions, the critical role of communities has been emphasized. Fresh design thinking is seen as necessary to ensure sustainability of efforts. Providing access to safe drinking water and WASH environment to the masses in India are no doubt complex, with multi-sectoral challenges. But, without securing these there can be no sustainable development. Public Health systems that are not built on the foundations of primordial prevention will continue to remain fragile.
- Published
- 2021
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29. Simple Technique of Exfoliation and Dispersion of Multilayer Graphene from Natural Graphite by Ozone-Assisted Sonication
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Zaw Lin, Paneer Selvam Karthik, Masaki Hada, Takeshi Nishikawa, and Yasuhiko Hayashi
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multilayer graphene ,ozone-assisted sonication ,exfoliation ,dispersion ,Chemistry ,QD1-999 - Abstract
Owing to its unique properties, graphene has attracted tremendous attention in many research fields. There is a great space to develop graphene synthesis techniques by an efficient and environmentally friendly approach. In this paper, we report a facile method to synthesize well-dispersed multilayer graphene (MLG) without using any chemical reagents or organic solvents. This was achieved by the ozone-assisted sonication of the natural graphite in a water medium. The frequency or number of ozone treatments plays an important role for the dispersion in the process. The possible mechanism of graphene exfoliation and the introduction of functional groups have been postulated. The experimental setup is unique for ozone treatment and enables the elimination of ozone off-gas. The heat generated by the dissipation of ultrasonic waves was used as it is, and no additional heat was supplied. The graphene dispersion was stable, and no evidence of aggregation was observed---even after several months. The characterization results show that well-dispersed MLG was successfully synthesized without any significant damage to the overall structure. The graphene obtained by this method has potential applications in composite materials, conductive coatings, energy storage, and electronic devices.
- Published
- 2017
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30. Spray cooling heat transfer: Technology overview and assessment of future challenges for micro-gravity application
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Silk, Eric A., Golliher, Eric L., and Paneer Selvam, R.
- Published
- 2008
- Full Text
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31. Synthesis and characterization of conductive flexible cellulose carbon nanohorn sheets for human tissue applications
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Toshiyuki Nakamura, Taichi Nagahata, Takeshi Nishikawa, Ayano Satoh, Karthik Paneer Selvam, Mayuko Koreishi, Yoshimasa Nakamura, Kosuke Kato, and Yasuhiko Hayashi
- Subjects
lcsh:Medical technology ,Materials science ,Scanning electron microscope ,Composite number ,Biomedical Engineering ,Medicine (miscellaneous) ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Carbon Nanohorns ,Biomaterials ,chemistry.chemical_compound ,symbols.namesake ,Ultimate tensile strength ,Cellulose ,Fourier transform infrared spectroscopy ,Bio-compatible ,Composites ,Biomaterial ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,lcsh:R855-855.5 ,chemistry ,Chemical engineering ,Transmission electron microscopy ,Ceramics and Composites ,symbols ,0210 nano-technology ,Raman spectroscopy ,Skin sensitization ,Research Article - Abstract
Background Conductive sheets of cellulose and carbon nanomaterials and its human skin applications are an interesting research aspect as they have potential for applications for skin compatibility. Hence it is needed to explore the effects and shed light on these applications. Method To fabricate wearable, portable, flexible, lightweight, inexpensive, and biocompatible composite materials, carbon nanohorns (CNHs) and hydroxyethylcellulose (HEC) were used as precursors to prepare CNH-HEC (Cnh-cel) composite sheets. Cnh-cel sheets were prepared with different loading concentrations of CNHs (10, 20 50,100 mg) in 200 mg cellulose. To fabricate the bio-compatible sheets, a pristine composite of CNHs and HEC was prepared without any pretreatment of the materials. Results The obtained sheets possess a conductivity of 1.83 × 10− 10 S/m and bio-compatible with human skin. Analysis for skin-compatibility was performed for Cnh-cel sheets by h-CLAT in vitro skin sensitization tests to evaluate the activation of THP-1 cells. It was found that THP-1 cells were not activated by Cnh-cel; hence Cnh-cel is a safe biomaterial for human skin. It was also found that the composite allowed only a maximum loading of 100 mg to retain the consistent geometry of free-standing sheets of Conclusion It can be concluded that cellulose and CNHs sheets are conductive and compatible to human skin applications.
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- 2020
32. Synthesis and Characterization of Human Skin-Compatible Conductive Flexible Cellulose Carbon Nanohorn Sheets
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Toshiyuki Nakamura, Yasuhiko Hayashi, Yoshimasa Nakamura, Karthik Paneer Selvam, Ayano Satoh, Mayuko Koreishi, Kosuke Kato, Taichi Nagahata, and Takeshi Nishikawa
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Carbon Nanohorn ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,Human skin ,Cellulose ,Electrical conductor ,Characterization (materials science) - Abstract
Background: Conductive sheets of cellulose and carbon nanomaterials and its human skin applications are an interesting research aspect as they have potential for applications for skin compatibility. Hence it is needed to explore the effects and shed light on these applications.Method: To fabricate wearable, portable, flexible, lightweight, inexpensive, and biocompatible composite materials, carbon nanohorns (CNHs) and hydroxyethylcellulose (HEC) were used as precursors to prepare CNH-HEC (Cnh-cel) composite sheets. Cnh-cel sheets were prepared with different loading concentrations of CNHs (10, 20 50,100 mg) in 200 mg cellulose. To fabricate the bio-compatible sheets, a pristine composite of CNHs and HEC was prepared without any pretreatment of the materials. Results: The obtained sheets are conductive (1.83×10-5 S) and bio-compatible with human skin. Analysis for skin-compatibility was performed for Cnh-cel sheets by h-CLAT in vitro skin sensitization tests to evaluate the activation of THP-1 cells. It was found that THP-1 cells were not activated by Cnh-cel; hence Cnh-cel is a safe biomaterial for human skin. It was also found that the composite allowed only a maximum loading of 100 mg to retain the consistent geometry of free-standing sheets of < 100 µm thickness. Since CNHs have a unique arrangement of aggregates (dahlia structure), the composite is homogeneous, as verified by transmission electron microscopy (TEM) and, scanning electron microscopy (SEM), and other functional properties investigated by Raman spectroscopy, Fourier transform infrared spectroscopy (FT-IR), conductance measurement, tensile strength measurement, and skin sensitization.Conclusion: It can be concluded that cellulose and CNHs sheets are conductive and compatible to human skin applications.
- Published
- 2020
33. Acclimating the magnetic behavior of highly (117) oriented Bi4Ti 3-xMnxO12 thin films prepared sol-gel spin coating method
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R. Paneer Selvam, Gopalakrishnan Gopu, A. Amali Roselin, K. P. Ganesan, I. Joseph Paneer Doss, and N. Anandhan
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Spin coating ,Materials science ,Morphology (linguistics) ,Ferromagnetic material properties ,Dopant ,Chemical engineering ,Doping ,Particle size ,Thin film ,Sol-gel - Abstract
Single-phase highly oriented (117) Bi4Ti3-xMnxO12 thin films were synthesized by using sol-gel spin coating method. The effect of dopant on the prepared films was subjected to understand the structural, optical, morphology and magnetic behavior of the films with the aid of XRD, Uv-Vis, SEM, and VSM. XRD study confirmed that no structural changes occur with doping of Mn into BTO thin film. Optical studies of the films exhibit the quality of the film with an increase of Mn dopant. The surface morphological image showed a rough surface with irregular particle size. Magnetic studies showed that Mn doping can significantly enhance the ferromagnetic properties with high retention and high corrective field which may be more extensively applicable for electromagnetic devices.
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- 2020
34. Benzothiadiazole-Based Diarylamines as a Fluoride Sensor: Prevention of Fluoride Induced Decomposition of Receptor Molecule by Complex Formation with Cu2+
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Chinnusamy Saravanan, Kumaravel Elavarasan, Shanmugam Easwaramoorthi, and Nagarajan Paneer Selvam
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chemistry.chemical_compound ,chemistry ,Receptor molecule ,Complex formation ,General Chemistry ,Photochemistry ,Fluoride ,Decomposition - Published
- 2018
35. Is it worth repairing rheumatic mitral valve disease in children? Long-term outcomes of an aggressive approach to rheumatic mitral valve repair compared to replacement in young patients†
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Pau Kiew Kong, Sivakumar Sivalingam, Jeswant Dillon, Paneer Selvam Krishna Moorthy, and Mohd Azhari Yakub
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Male ,Pulmonary and Respiratory Medicine ,medicine.medical_specialty ,Mitral Valve Annuloplasty ,Adolescent ,Heart disease ,medicine.medical_treatment ,Disease ,030204 cardiovascular system & hematology ,03 medical and health sciences ,0302 clinical medicine ,Mitral valve ,medicine ,Long term outcomes ,Humans ,In patient ,Postoperative Period ,Child ,Heart Valve Prosthesis Implantation ,Mitral regurgitation ,Mitral valve repair ,business.industry ,Rheumatic Heart Disease ,Mitral Valve Insufficiency ,Mean age ,medicine.disease ,Surgery ,Treatment Outcome ,medicine.anatomical_structure ,030228 respiratory system ,Mitral Valve ,Female ,Cardiology and Cardiovascular Medicine ,business ,Follow-Up Studies ,Forecasting - Abstract
OBJECTIVES Contemporary experience in mitral valve (MV) repair for children with rheumatic heart disease (RHD) is limited, despite the potential advantages of repair over replacement. We reviewed our long-term outcomes of rheumatic MV repair and compared them with the outcomes of MV replacement in children with RHD. METHODS This study is a review of 419 children (≤18 years) with RHD who underwent primary isolated MV surgery between 1992 and 2015, which comprised MV repair (336 patients; 80.2%) and MV replacement (83 patients; 19.8%). The replacement group included mechanical MV replacements (MMVRs) (n = 69 patients; 16.5%) and bioprosthetic MV replacements (n = 14 patients; 3.3%). The mean age with standard deviation at the time of operation was 12.5 ± 3.5 (2-18) years. Mitral regurgitation (MR) was predominant in 390 (93.1%) patients, and 341 (81.4%) patients showed ≥3+ MR. The modified Carpentier reconstructive techniques were used for MV repair. RESULTS Overall early mortality was 1.7% (7 patients). The mean follow-up was 5.6 years (range 0-22.3 years; 94.7% complete). Survival of patients who underwent repair was 93.9% both at 10 and 20 years, which was superior than that of replacement (P
- Published
- 2018
36. Legislation and policy options for conservation and management of seagrass ecosystems in India
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A. Paneer Selvam, R. Purvaja, Pandian Krishnan, Kakolee Banerjee, Ramachandran Ramesh, and Ahana Lakshmi
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0106 biological sciences ,010504 meteorology & atmospheric sciences ,biology ,Fishing ,Wildlife ,Biodiversity ,Climate change ,Legislation ,Management, Monitoring, Policy and Law ,Aquatic Science ,Oceanography ,biology.organism_classification ,01 natural sciences ,010601 ecology ,Seagrass ,Geography ,Environmental protection ,Ecosystem ,0105 earth and related environmental sciences ,Trophic level - Abstract
Seagrass meadows are recognized as one of the most productive ecosystems in the coastal zone supporting a wide variety of keystone and ecologically important marine species from diverse trophic levels. This paper examines existing policies and legislations that can help in the protection, conservation and threats to seagrass ecosystems. The paper i) reviews the key legislations with provisions to conserve seagrass ecosystems in India such as the Coastal Regulation Zone (CRZ) Notification (2011) issued under the Environment (Protection), Act 1986, the Wildlife (Protection) Act, (1972), Biodiversity Act, 2002 and the Marine Fishing Regulation Acts of different coastal states in India; ii) identifies threats to the seagrass meadows and iii) suggests measures for enhancing conservation of seagrass.
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- 2018
37. Valuing the carbon sequestration regulation service by seagrass ecosystems of Palk Bay and Chilika, India
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Dipnarayan Ganguly, A. Paneer Selvam, R. Purvaja, R. Bhatta, Kakolee Banerjee, Gurmeet Singh, and Ramachandran Ramesh
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0106 biological sciences ,Biomass (ecology) ,010504 meteorology & atmospheric sciences ,biology ,Ecology ,010604 marine biology & hydrobiology ,Context (language use) ,Management, Monitoring, Policy and Law ,Aquatic Science ,Carbon sequestration ,Oceanography ,biology.organism_classification ,01 natural sciences ,Ecosystem services ,Seagrass ,Productivity (ecology) ,Environmental protection ,Environmental science ,Ecosystem ,Bay ,0105 earth and related environmental sciences - Abstract
The regulatory ecosystem services in terms of carbon sequestration and storage by Indian seagrass ecosystems were coupled with their monetary values in the context of climate change mitigation in the seagrass meadows of Palk Bay and Chilika Lagoon, two major seagrass ecosystems of India. The results showed that the meadows acted as a net sink of atmospheric CO2; however, they may also act as a minor source of CO2 to the atmosphere depending on the degree of anthropogenic influence. The mean ecosystem productivity ranged between 6.31 and 11.9 kg C ha−1d−1, which is equivalent to the capture of 8.44 and 15.9 Mg CO2 ha−1 year−1. This captured carbon was apportioned primarily in sediments (129 Mg Corg ha−1 in top 1 m soil), which was much higher than the carbon stored as above and below ground biomass (0.20–0.96 Mg Corg ha−1 and 0.30–2.90 Mg Corg ha−1, respectively). The economic valuation of regulatory ecosystem services in the form of C sequestration by an estimated 51,700 ha of total seagrass cover in India was largely dependent on the sequestration rates and the average social cost of carbon. The estimated values ranged between $ 1.02 million and $ 3.65 million per year. In addition, monetary values of the stored carbon in live biomass of Indian seagrass systems ranged between $ 0.45 million and $ 3.89 million, whereas, in the top 1 m soil it ranged between $ 109 million and $ 146 million. Detailed evaluations of various ecosystem functions considering the importance of the local variables may provide a better monetary estimate of these regulatory services.
- Published
- 2018
38. The Anatomy of a Nonfaradaic Electrochemical Biosensor
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Shalini Prasad, Anjan Paneer Selvam, Nandhinee Radha Shanmugam, and Hunter Stevenson
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Diagnostic Tests, Routine ,business.industry ,Point-of-Care Systems ,010401 analytical chemistry ,Proteins ,Nanotechnology ,Biosensing Techniques ,Electrochemical Techniques ,02 engineering and technology ,Models, Theoretical ,021001 nanoscience & nanotechnology ,01 natural sciences ,humanities ,0104 chemical sciences ,Computer Science Applications ,Medical Laboratory Technology ,Humans ,Medicine ,Electrochemical biosensor ,0210 nano-technology ,business ,Biomarkers - Abstract
Point-of-care (POC) testing has revolutionized diagnostic healthcare, bringing medical results directly and immediately to the patient. With faster diagnostics, more immediate clinical management decisions can be made. POC tests most often use a dipstick or swab format to detect the presence of a pathogen, disease, or other relevant biomarker. In these formats, the POC tests eliminate the need for complex lab equipment and trained personnel to collect, process, and analyze sample data for simple diagnostics. However, these tests cannot satisfy all clinical needs, because accurate quantitative results are needed. The present study serves as a template for designing a nonfaradaic electrochemical biosensor toward quantitative POC diagnostics. We focus on investigating the most important parameters when constructing a nonfaradaic biosensor through both mathematical modeling and electrochemical measurements. Furthermore, we demonstrate quantitative affinity biosensing of a model protein toward developing a POC device.
- Published
- 2018
39. Mid-Term Results Comparing the Use of Artificial Chords Versus Native Chords for Mitral Valve Repair in Children
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Sivalingam, Sivakumar, primary, Haranal, Maruti, additional, Moorthy, Paneer Selvam Krishna, additional, Dillon, Jeswant, additional, Kong, Pau Kiew, additional, Fariza, Intan, additional, and Yakub, Mohd. Azhari, additional
- Published
- 2020
- Full Text
- View/download PDF
40. Synthesis of solvent-free conductive and flexible cellulose–carbon nanohorn sheets and their application as a water vapor sensor
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Paneer Selvam, Karthik, primary, Nakagawa, Tomohiro, additional, Marui, Tatsuki, additional, Inoue, Hirotaka, additional, Nishikawa, Takeshi, additional, and Hayashi, Yasuhiko, additional
- Published
- 2020
- Full Text
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41. Ultrasonic-assisted synthesis of ZnO nano particles decked with few layered graphene nanocomposite as photoanode in dye-sensitized solar cell
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Karthik Paneer Selvam, Yasuhiko Hayashi, Satish Bykkam, Bikshalu Kalagadda, and Venkateshwara Rao Kalagadda
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Nanocomposite ,Materials science ,Graphene ,Nanoparticle ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Tin oxide ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,0104 chemical sciences ,Electronic, Optical and Magnetic Materials ,law.invention ,Dye-sensitized solar cell ,Chemical engineering ,law ,Solar cell ,Electrical and Electronic Engineering ,Thin film ,Fourier transform infrared spectroscopy ,0210 nano-technology - Abstract
ZnO decked few layered graphene (FLG; 1.0, 2.0 and 3.0 wt%) nanocomposites were synthesized by simple and cost effective way using ultrasonic-assisted synthesis method. The morphological, optical and structural properties of as-synthesized nanocomposites were analyzed by field emission scanning electron microscopy and high-resolution transmission electron microscopy, UV–Visible spectroscopy with diffuse reflectance, fourier transform infrared spectroscopy, X-ray diffractometry and ramam spectroscopy. The synthesized FLG (1.0, 2.0 and 3.0 wt%)/ZnO nanocomposite were used as photoanode materials and deposited as thin films on fluorine-doped tin oxide substrate by doctor blade method for dye-sensitized solar cell (DSSC) fabrication. By varying the FLG weight percentage (1.0, 2.0 and 3.0 wt%) in ZnO nanocomposites the power conversion efficiency (PCE) in DSSC was optimized. Using N719 dye the current density–voltage (J–V) was measured under AM 1.5G, 100 m W/m2 of the solar simulator. Results obtained after optimization showed PCE of 4.61% at the suitable FLG (1.0 wt%)/ZnO, compared to ZnO and other photoanodes.
- Published
- 2017
42. Electrochemical sensor for the detection of lead ions of B-site-doped bismuth titanate perovskite thin film
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K. P. Ganesan, N. Anandhan, Ganesan Sivakumar, A. Amali Roselin, T. Marimuthu, Gopalakrishnan Gopu, I. Joseph Panneer Doss, and R. Paneer Selvam
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010302 applied physics ,Spin coating ,Materials science ,Scanning electron microscope ,Bismuth titanate ,Analytical chemistry ,02 engineering and technology ,General Chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Electrochemical gas sensor ,chemistry.chemical_compound ,chemistry ,0103 physical sciences ,General Materials Science ,Crystallite ,Thin film ,Cyclic voltammetry ,0210 nano-technology ,Perovskite (structure) - Abstract
The perovskite thin film was fabricated using cobalt (Co)-doped B-site on bismuth titanate (Bi4Ti3−xCoxO12) on FTO substrate by spin coating technique. The fabricated substrate was annealed at 700 °C and employed as an electrochemical sensor for the detection of lead ions. The obtained device was investigated for their structural, optical and morphological features using X-ray diffraction (XRD), UV–V is spectroscopy (UV), photoluminescence and scanning electron microscopy (SEM). XRD patterns reveal that the grains were orientated along c axis with (117) plane providing decreased crystallite size upon increasing dopant concentrations in BTO. UV–Vis diffusion reflectance spectrum showed that bismuth titanate thin films exhibited good optical transmittance in the visible region. BTO thin films displayed particles are in spherical in shape which was confirmed using SEM. The acquired thin film was employed as an electrochemical sensor for the detection of lead ions. The detection technique was carried out using cyclic voltammetry which delivered high sensitivity. On examining the physical and chemical properties of the obtained product, it can also be further employed as real-time applications.
- Published
- 2019
43. Correction to: Assessment of bioavailable nitrogen and phosphorus content in the sediments of Indian mangroves
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Yudhistir Reddy, Paneer Selvam Arumughan, Gurmeet Singh, Dipnarayan Ganguly, Purvaja Ramachandran, M.H.K. Prasad, Ramesh Ramachandran, Arumugam Kathirvel, and Kakolee Banerjee
- Subjects
chemistry ,Health, Toxicology and Mutagenesis ,Phosphorus ,Environmental chemistry ,Environmental Chemistry ,chemistry.chemical_element ,Environmental science ,Ecotoxicology ,General Medicine ,Mangrove ,Pollution ,Nitrogen ,Bioavailability - Published
- 2021
44. Central retinal vein occlusion in a patient with breast carcinoma
- Author
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Madanagopalan, VG, Paneer Selvam, V, Sarath Sivan, NV, Govindaraju, NV, Madanagopalan, VG, Paneer Selvam, V, Sarath Sivan, NV, and Govindaraju, NV
- Abstract
Purpose: Systemic malignancies may have ocular manifestations in the form of metastatic tumors, carcinoma associated retinopathy or central retinal vein occlusion (CRVO). Although CRVO has been mentioned in association with renal, lung, prostatic and ovarian malignancies, the association of CRVO with breast carcinoma is unreported. We report a patient with one such rare association.Methods: We describe a patient with breast carcinoma who was diagnosed to have CRVO. The history, ocular examination, retinal optical coherence tomography scan, ocular ultrasound scan, hematological profile, mammogram details and aspiration cytology description of the malignant breast lesion are reported in this article. Results: The retina showed extensive hemorrhages and dilated retinal veins. Complete hematologic evaluation revealed the presence of microcytic hypochromic anemia and increased hematocrit. These changes are possibly related to the malignant disease and might contribute to the pathogenesis of CRVO. Coclusion: This case report demonstrates the rare association between breast malignancy and CRVO.
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- 2019
45. Electromagnetic Nondestructive Material Characterization of Dielectrics Using EBG Based Planar Transmission Line Sensor
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Esther Florence Sundarsingh, Sangeetha Subbaraj, Yogeshwari Paneer Selvam, Vimal Samsingh Ramalingam, Malathi Kanagasabai, and Saffrine Kingsley
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Permittivity ,Materials science ,business.industry ,010401 analytical chemistry ,Physics::Optics ,020206 networking & telecommunications ,02 engineering and technology ,Dielectric ,01 natural sciences ,Square (algebra) ,0104 chemical sciences ,Characterization (materials science) ,Condensed Matter::Materials Science ,Optics ,Planar ,Transmission line ,0202 electrical engineering, electronic engineering, information engineering ,Curve fitting ,Dissipation factor ,Electrical and Electronic Engineering ,business ,Instrumentation - Abstract
In this paper, a novel noninvasive electromagnetic method of characterization of the electrical properties of dielectrics is presented. A planar microstrip transmission line method has been employed to measure the complex permittivity of the dielectric materials. The transmission line carrying microwave signals is bridged on both sides by electromagnetic bandgap structures which notches only 2.4 GHz. The electrical properties are measured at this frequency. The dielectric is loaded on this transmission line. The notched frequency information and the magnitude of the transmission response are observed using the computer simulation technology for various materials whose real part of permittivity and loss tangent values are known. Relation for finding the permittivity of the dielectric based on the observed response has been derived using curve fitting. The imaginary part of the permittivity of the dielectric is calculated from the loss tangent. The accuracy of the numerical model is developed and the efficiency of the testing method is tested through the measurement of various materials and the goodness of fit of the derived equation is verified. The proposed model exhibits an ${R}$ -square measure of goodness of fit of 99.83% for the real part of permittivity and 96.67% for the imaginary part of permittivity.
- Published
- 2016
46. Dispersion of Relatively Long Multi-walled Carbon Nanotubes in Water using Ozone Generated by Dielectric Barrier Discharge
- Author
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Zaw Lin, Mitsunobu Yoshida, Karthik Paneer Selvam, Yasuhiko Hayashi, Takeshi Nishikawa, and Yuki Uesugi
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010302 applied physics ,Materials science ,Ozone ,02 engineering and technology ,Dielectric barrier discharge ,Carbon nanotube ,021001 nanoscience & nanotechnology ,01 natural sciences ,law.invention ,chemistry.chemical_compound ,chemistry ,law ,0103 physical sciences ,Dispersion (optics) ,Electrical and Electronic Engineering ,Composite material ,0210 nano-technology - Published
- 2016
47. Gender Stratified Physical and Psychological Health Status and Its’ Correlation among Community-Dwelling Older Adults.
- Author
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Hardev Singh, Rajwinder Kaur, Ajit Singh, Devinder Kaur, Ideris, Norhamizah, Subramaniam, Ponnusamy, and Paneer Selvam, Sheela Bai
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OLDER people ,GENDER ,PRIMARY care ,PHYSICAL mobility ,ADULTS - Abstract
Background: Maintenance of physical and psychological health is crucial to prevent general health problems in older persons. There is inadequate information on gender based physical and psychological health status in older adults attending primary care clinics in Malaysia. Study Design: Cross-sectional study Methods: 106 participants were required to perform physical performance tests consisting of 30secs chair stand (30sCS), chair sit and reach (CSR), back scratch (BS), timed up and go (TUG), single leg stance (SLS) and 2minutes walk (2MWT) tests. Psychological health measures consisted of Satisfaction with Life Scale (SWLS) and General Health Questionnaire-28 (GHQ-28). Results: Only CSR was found to be significantly higher in men (M= 1.27, SD= 3.1) compared to women (M= -0.88, SD= 3.67). A significant correlation (p<0.05) was found only in men between GHQ-28 and 30 seconds sit to stand test (r= -0.424), TUG (r= 0.361) and 2 Minute walk test (r= -0.436). Conclusion: Older males and females had similar physical and psychological measures except for lower limb flexibility which was greater in females. Lower physical performance (lower body strength, mobility and endurance) correlated with higher psychological issues in older males. There may be a need to consider distinct physical and psychological needs between genders in order to provide optimum health prevention and management stategies among older adults. [ABSTRACT FROM AUTHOR]
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- 2021
- Full Text
- View/download PDF
48. Soil Fertility Evaluation to Adopt Climate-Smart Agriculture in Mambattu Village, Maduranthakam Block of Kanchipuram District, Tamil Nadu, India.
- Author
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Palani, Kalpana, Paneer Selvam, Selva Preetha, Velusamy, Sathya, and Melmangalam, Ramasubramaniyan Ramanathan
- Subjects
SOIL fertility ,GLOBAL Positioning System ,INTEGRATED pest control ,AGRICULTURAL technology ,GREEN manuring ,AGRICULTURE ,INCEPTISOLS - Abstract
Assessment of soil fertility is essential to help identify strategies for sustainable agricultural production systems that decrease the negative environmental impact. The objective of this research study is to carry out a preliminary assessment of soil fertility status to adopt climate-smart agriculture to address the climate change challenges that adversely affect crop productivity and livelihoods of the farming community. The research was carried out in Mambattu village, Maduranthakam block of Kanchipuram district, Tamil Nadu. A systematic set of twenty geo-referenced soil samples were collected from the study village using GPS (Global Positioning System) and analysed for pH, EC, available macro, secondary and micronutrients to develop a credible soil fertility index (SFI). The preliminary fertility data of Mambattu village revealed that the pH of soil samples varied from acidic to alkaline with about 40% as neutral while the electrical conductivity showed non-saline and medium status of Organic Carbon (OC). The soil samples were predominantly sufficient in N and some micro nutrients (Fe, Mn), while medium in S and B and deficient in P, K, Ca, Mg, Zn and Cu. Results from initial studies indicate that practices like site specific nutrient management, green manuring, use of organic inputs, use of integrated pest management, seed treatment etc., have a high potential for implementing climate-smart agricultural technologies. Soil fertility evaluation can be an efficient tool to improve soil health which can positively impact crop productivity and be one of the important climate-smart technologies practices adopted by the farmers. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
49. Assessment of medication adherence using medication adherence rating scale-5 in patients with major non-communicable diseases at tertiary care hospital
- Author
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Mahendravarman Paneer Selvam, Marina Andavar, and Mahalakshmi Natarajan
- Subjects
medicine.medical_specialty ,Rating scale ,business.industry ,Family medicine ,medicine ,Medication adherence ,In patient ,Tertiary care hospital ,business - Abstract
Background: To assess the medication adherence using medication adherence rating scale (MARS-5) for achieving good clinical outcomes in patients with major non-communicable chronic diseases who are undergoing long-term therapy and to compare the adherence between adult and geriatric patients based on patient counselling.Methods: A Prospective observational study was conducted in the Department of Medicine, Raja Muthiah Medical College Hospital (RMMCH), Chidambaram, India over a period of 6 months. Patient details were collected using self-designed patient proforma. Patients’ medication adherence was assessed using MARS-5 and patients were counselled regarding drug use with the help of pictograms and daily monitoring sheet.Results: A total of 150 patients were enrolled in the study out of which 77 were adults and 73 were from the geriatric population. 65.33% were affected with comorbid conditions. Non-compliance was mainly due to forgetfulness, lack of assistance in the elderly population, polypharmacy and also due to failing to refill prescriptions. Nearly half of the population about 40% showed poor adherence before patient counselling and was reduced to 13.33% after proper patient counselling. And the medication adherence was found to be more among the adults 90.90% when compared to the geriatric population 82.19%.Conclusions: A new approach through pharmaceutical care was implemented; it mainly aims in delivering information regarding the importance of therapy in non-communicable chronic illness and also on the non-therapeutic considerations. It also focuses in conveying the importance of their lives to their families and to the society, thereby improving the adherence to medicine.
- Published
- 2020
50. Synthesis of solvent-free conductive and flexible cellulose-carbon nanohorn sheets and their application as a water vapor sensor
- Author
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Yasuhiko Hayashi, Hirotaka Inoue, Tomohiro Nakagawa, Takeshi Nishikawa, Tatsuki Marui, and Karthik Paneer Selvam
- Subjects
Thermogravimetric analysis ,Materials science ,Polymers and Plastics ,Scanning electron microscope ,Composite number ,Metals and Alloys ,chemistry.chemical_element ,vapor sensor ,cellulose ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Biomaterials ,chemistry.chemical_compound ,symbols.namesake ,chemistry ,Chemical engineering ,carbon nanohorns ,Ultimate tensile strength ,symbols ,conductive sheets ,Cellulose ,Fourier transform infrared spectroscopy ,Raman spectroscopy ,Carbon - Abstract
Carbon nanohorns (CNHs) are mixed with cellulose to make freestanding thin-film conductive sheets. CNHs, at different ratios (5, 10, 25, 50 wt%), form composites with cellulose (hydroxyethylcellulose). Freestanding cellulose–carbon nanohorn (CCN) sheets were fabricated using a 100 μm-thick metal bar coater. Surfactants or any other chemical treatments to tailor the surface properties of CNHs were avoided to obtain composite sheets from pristine CNHs and cellulose. Utilizing the hygroscopic property of hydroxyethylcellulose and the electrical conductivity of CNHs paved a path to perform this experiment. The synthesis technique is simple, and the fabrication and drying of the sheets were effortless. As the loading concentration of CNH increased, the resistance, flexibility, and strength of the CCN composite sheets decreased. The maximum loading concentration possible to obtain a freestanding CCN sheet is 50 wt%. The resistance of the maximum loading concentration of CNH was 53 kΩ. The response of the CCN sheets to water vapor was 4 s and recover time was 13 s, and it is feasible to obtain a response for different concentrations of water vapor. High-resolution transmission electron microscopy, scanning electron microscopy, Fourier transform infrared spectroscopy, Raman spectroscopy, resistance measurement, tensile strength measurement, and thermogravimetric analysis were used to investigate the mechanical, morphological, electrical, and chemical properties of the CCN sheets.
- Published
- 2020
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