277 results on '"Kumar BV"'
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2. Weighted Extended B-Spline Finite Element Analysis of a coupled system of general Elliptic equations
- Author
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Chakraborty, Ayan and Kumar, BV. Rathish
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Mathematics - Numerical Analysis - Abstract
In this study we establish the existence and uniqueness of the solution of a coupled system of general elliptic equations with anisotropic diffusion , non-uniform advection and variably influencing reaction terms on Lipschitz continuous domain $\Omega \subset \mathbb{R}^m $ (m$\geq$1) with a Dirichlet boundary. Later we consider the finite element (FE) approximation of the coupled equations in a meshless framework based on weighted extended B-Spine functions (WEBS).The a priori error estimates corresponding to the finite element analysis are derived to establish the convergence of the corresponding FE scheme and the numerical methodology has been tested on few examples.
- Published
- 2018
3. DistilBERT: A Novel Approach to Detect Text Generated by Large Language Models (LLM)
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Kumar, BV Pranay, primary, Ahmed, MD Shaheer, additional, and Sadanandam, Manchala, additional
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- 2024
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4. Enhancing Tablet Dissolution Insights: A Comparative Study of Predictive ANN, PLS, and SVM Model With NIR Spectra
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Ringe, Shruti, primary, Kulkarni, Shounak, additional, Sutar, Abhijeet, additional, Kumar BV, Suresh, additional, and Shenoy, Anurag, additional
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- 2023
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5. A Fusion Architecture of BERT and RoBERTa for Enhanced Performance of Sentiment Analysis of Social Media Platforms
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Pranay Kumar, BV, primary and Sadanandam, Manchala, additional
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- 2023
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6. Expression of heat shock protein D1 is up-regulated in canine mammary tumors
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Kaur, Gurpreet, primary, Kumar, BV Sunil, additional, and Gupta, Kuldip, additional
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- 2022
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7. Associations of Fuchs heterochromic iridocyclitis in a South Indian patient population
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Babu, Kalpana, Adiga, Madhura, Govekar, Sunil R, Kumar, BV Ravi, and Murthy, Krishna R
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- 2013
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8. Female adnexal tumour of Wolffian origin (FATWO) arising from broad ligament: A rare case report with mutation analysis and review of literature
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MJ Avinash, Varini N Murthy, Belagavi Cs, and Satish Kumar Bv
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Pathology ,medicine.medical_specialty ,business.industry ,Rare case ,Mutation testing ,Medicine ,Adnexal tumour ,business ,Broad ligament - Published
- 2019
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9. Exposures to 2,4-Dichlorophenoxyacetic acid with or without endotoxin upregulate small cell lung cancer pathway
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Kaur, Geetika, primary, Kumar, BV Sunil, additional, Singh, Baljit, additional, and Sethi, RS, additional
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- 2021
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10. Thematic Study on Machine Farm Ponds with Farm Bund-Integrated Watershed Management Programme – Ananthapuramu
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Reddy, PVRM, primary, Janardha Reddy, B, additional, Ramana Kumar, BV, additional, Jhansi Rani, R, additional, and Vidyapogu, Pullanna, additional
- Published
- 2020
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11. Exposures to 2,4-Dichlorophenoxyacetic Acid With or Without Endotoxin Upregulate Small Cell Lung Cancer Pathway
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Kaur, Geetika, primary, Kumar, BV Sunil, additional, Singh, Baljit, additional, and Sethi, RS, additional
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- 2020
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12. Empowerment of SC/ST Communities Through Watershed Activities in Rayalaseema Region
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Reddy, PVRM, primary, Reddy, B Janardhan, additional, and Ramana Kumar, BV, additional
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- 2020
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13. Characterization of Suryashekhara Rasa Prepared Through Conventional Method and Electrical Muffle Furnace
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Rohit Gokarn, Kishore Kumar Bv, and M S Doddamani
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Materials science ,business.product_category ,Chemical engineering ,Hexagonal crystal system ,Bottle ,Particle size ,Fourier transform infrared spectroscopy ,business ,Characterization (materials science) - Abstract
Background: Advancements in instrumentations has eased many operative procedures and has reduced human efforts in terms of time and labor. But at the same time it is very important to preserve the principle of pharmaceutical preparation with standardized products that meet the expectation of industry in terms of production. The other important factors being to get cost effective drug with maximum safety and efcacy. Aims: Production of Bhasmas (ashes) has been replaced from conventional Puta/Bhatti to Electrical Mufe Furnace (EMF), however the pros and cons of the same has to be evaluated through proper study. Materials & Methods: Suryashekhara Rasa, a Kupipakwa Rasayana (preparation done in glass bottle) was prepared in conventional Bhatti and EMF by subjecting to 18 hrs of Kramagni (gradual intermittent rise of temperature). Further Kajjali and end products were analyzed for physico-chemical analysis, XRD, SEM-EDX, FTIR and Particle size. Results: Both the samples analyzed by XRD showed the presence of HgS Cinnabar in Hexagonal crystal structure. Particle size in conventional method was 0.64 μm and in EMF was 0.51 μm. Both the samples showed the presence of primary amines, alkanes, methyl, Aromatic, uroalkanes and Bromo-alkanes in FTIR analysis. Conclusion: Conventional method of Kupipakwa Rasayana in Bhatti can be effectively replaced by Electrical mufe Furnace. In both methods the analytical ndings did not show any notable variations. The particle size however were smaller in samples prepared through EMF.
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- 2017
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14. Curcumin binds in silico to anti-cancer drug target enzyme MMP-3 (human stromelysin-1) with affinity comparable to two known inhibitors of the enzyme
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Bidwai A, Kumar Bv, Yahya Hasan Hobani, and Ahmed Jerah
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chemistry.chemical_classification ,MMP-3 ,biology ,Chemistry ,drug design ,In silico ,Active site ,General Medicine ,Pharmacology ,AutoDock ,Hypothesis ,Stromelysin 1 ,chemistry.chemical_compound ,Enzyme ,Biochemistry ,Docking (molecular) ,docking ,biology.protein ,Curcumin ,curcumin ,Lead compound - Abstract
In silico interaction of curcumin with the enzyme MMP-3 (human stromelysin-1) was studied by molecular docking using AutoDock 4.2 as the docking software application. AutoDock 4.2 software serves as a valid and acceptable docking application to study the interactions of small compounds with proteins. Interactions of curcumin with MMP-3 were compared to those of two known inhibitors of the enzyme, PBSA and MPPT. The calculated free energy of binding (ΔG binding) shows that curcumin binds with affinity comparable to or better than the two known inhibitors. Binding interactions of curcumin with active site residues of the enzyme are also predicted. Curcumin appears to bind in an extendended conformation making extensive VDW contacts in the active site of the enzyme. Hydrogen bonding and pi-pi interactions with key active site residues is also observed. Thus, curcumin can be considered as a good lead compound in the development of new inhibitors of MMP-3 which is a potential target of anticancer drugs. The results of these studies can serve as a starting point for further computational and experimental studies.
- Published
- 2015
15. Human immunology studies using organ donors: Impact of clinical variations on immune parameters in tissues and circulation
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Carpenter, DJ, Granot, T, Matsuoka, N, Senda, T, Kumar, BV, Thome, JJC, Gordon, CL, Miron, M, Weiner, J, Connors, T, Lerner, H, Friedman, A, Kato, T, Griesemer, AD, Farber, DL, Carpenter, DJ, Granot, T, Matsuoka, N, Senda, T, Kumar, BV, Thome, JJC, Gordon, CL, Miron, M, Weiner, J, Connors, T, Lerner, H, Friedman, A, Kato, T, Griesemer, AD, and Farber, DL
- Abstract
Organ donors are sources of physiologically healthy organs and tissues for life-saving transplantation, and have been recently used for human immunology studies which are typically confined to the sampling of peripheral blood. Donors comprise a diverse population with different causes of death and clinical outcomes during hospitalization, and the effects of such variations on immune parameters in blood and tissues are not known. We present here a coordinate analysis of innate and adaptive immune components in blood, lymphoid (bone marrow, spleen, lymph nodes), and mucosal (lungs, intestines) sites from a population of brain-dead organ donors (2 months-93 years; n = 291) across eight clinical parameters. Overall, the blood of donors exhibited similar monocyte and lymphocyte content and low serum levels of pro-inflammatory cytokines as healthy controls; however, donor blood had increased neutrophils and serum levels of IL-8, IL-6, and MCP-1 which varied with cause of death. In tissues, the frequency and composition of monocytes, neutrophils, B lymphocytes and T cell subsets in lymphoid or mucosal sites did not vary with clinical state, and was similar in donors independent of the extent of clinical complications. Our results reveal that organ donors maintain tissue homeostasis, and are a valuable resource for fundamental studies in human immunology.
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- 2018
16. Effective Ways Cloud Computing Can Contribute to Education Success
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Sumitha kommareddy, Uma Rani N, and Pranay kumar Bv
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Knowledge management ,Leverage (negotiation) ,business.industry ,Computer science ,media_common.quotation_subject ,Internet privacy ,Institution ,Face (sociological concept) ,Cloud computing ,General Medicine ,Philosophy of education ,business ,media_common - Abstract
Cloud computing and education sounds ambiguous on the face of it. Naturally, it’s because, very few individuals, publishers and users alike come from the education sector. In most cases, cloud computing is only associated with businesses and how they can leverage their efficiencies. Just to introduce how the cloud deserves a place in our current education institution, it’s important to reiterate the education philosophy. Its essence is knowledge. It’s this knowledge which brings advancement, achievement and success. However, there are several things which make these parameters unattainable. In blunt language, this is failure. Small classrooms, lack or resources, short-handed staff, lack of adequate teachers…the list is endless. One way or the other, cloud computing can be utilized to improve education standards and activities. The end result will be to curb the above problems and instead, boost performance.
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- 2013
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17. Incidental Identification of Possible Delta-Beta Thalassemia Trait in a Family: A Rare Cause of Elevated Hb F
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Samuel P, Kumar Bv, and Choccalingam C
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0301 basic medicine ,medicine.medical_specialty ,Pediatrics ,Genetic counseling ,Clinical Biochemistry ,lcsh:Medicine ,foetal haemoglobin ,03 medical and health sciences ,Internal medicine ,Medicine ,Cation exchange hplc ,Platelet ,Biochemistry Section ,Delta-beta thalassemia trait ,genetic counseling ,medicine.diagnostic_test ,business.industry ,lcsh:R ,Heterozygote advantage ,General Medicine ,Decreased haemoglobin ,haemoglobin variant analysis ,030104 developmental biology ,Endocrinology ,Male patient ,business ,Liver function tests - Abstract
Delta-Beta thalassaemia is an unusual variant of thalassaemia with elevated level of foetal haemoglobin (HbF). The clinical presentation of delta-beta thalassaemia is mild in both heterozygote and homozygote cases. We hereby describe a rare cause of elevated Hb F in a father and his two daughters. A 52-year-old diabetic male patient, on evaluation of chromatogram of cation exchange HPLC for HbA1c, we incidentally identified elevated Hb F of approximately 20%. Haematological investigation of the patient revealed decreased haemoglobin, normal RBC, leucocyte and platelet count, decreased MCV and MCH. Red cell morphology showed predominantly normocytic normochromic cells with mild anisopoikilocytosis, few microcytes and hypochromic cells seen. His liver function test was normal. Haemoglobin variant analysis revealed decreased Hb A (79.4%), normal Hb A2 (2%) and increased Hb F (19.75%). A possible diagnosis of heterozygous δ β-thalassaemia was considered. Since most laboratories perform HbA1c by cation exchange HPLC method, a careful evaluation of the chromatogram yields useful information. In our case, the elevated Hb F in a father and further careful evaluation of clinical and haematological parameters in the family members made us to possibly think of rare disorders like heterozygous Delta-Beta thalassaemia in the family and provide valuable genetic counseling.
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- 2016
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18. Characterization of Suryashekhara Rasa Prepared Through Conventional Method and Electrical Muffle Furnace
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Doddamani, M S, primary and Kumar BV, RohitGokarn,Kishore, additional
- Published
- 2017
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19. Optimization of Cultural Parameters for Cost Effective Production of Kojic Acid by Fungal Species Isolated from Soil
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Kumar Bv, Durgadevi Kb, Shilpa, and Vijayalakshmi P
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Aflatoxin ,Chromatography ,biology ,Size-exclusion chromatography ,Aspergillus flavus ,One-factor-at-a-time method ,biology.organism_classification ,High-performance liquid chromatography ,chemistry.chemical_compound ,Biochemistry ,chemistry ,Fermentation ,Agar diffusion test ,Kojic acid - Abstract
A novel isolate capable of producing opulent yields of kojic acid with surface fermentation was screened from ten different isolated soil fungi. The organism was confirmed as Aspergillus flavus FJ537130 strain using 18SrRNA based molecular analysis and it was identified as a negative producer of aflatoxin. Though twelve different carbon sources were used, significant yields of kojic acid crystals was noticed with Sago starch. The optimized conditions established were substrate concentration 1000 ml (100 g of starch powder in 1000 ml of H2O), pH 6.0, Time 28 d, Temperature 28°C, Peptone concentration 4 g/l, KH2PO4 concentration 1 g/l, MgSO4 concentration 0.5 g/l and the yield achieved was 28.5 g/l. The resulted fermentation broth was subjected to solvent extraction followed by gel filtration for the separation of kojic acid and crystallization. The structural characterization of purified kojic acid was confirmed by Proton NMR, FTIR and XRD. The molecular weight and purity of kojic acid was confirmed by LC/MS and HPLC. The isolated kojic acid crystals shows high antimicrobial activity against pathogenic bacteria Staphylococcus aureus and Escherichia coli and maximum zone of inhibition was 9 mm. The inhibitory effect of kojic acid was more on the cell line K562 (Leukemia) when compared to the MDAMB435S (Breast cancer) cell line.
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- 2015
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20. Gitelman's syndrome with panhypopituitarism: Reno-endocrine interplay
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Upreti, Dhull P, Kumar Bv, Prakash Ms, and Sharda C
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medicine.medical_specialty ,endocrine system ,Alkalosis ,Endocrinology, Diabetes and Metabolism ,Gitelman's syndrome ,Case Report ,Hypopituitarism ,lcsh:Diseases of the endocrine glands. Clinical endocrinology ,Hypocalciuria ,Hypomagnesemia ,hypomagnesemia ,Endocrinology ,Tubulopathy ,Internal medicine ,medicine ,hypokalemia ,Endocrine system ,lcsh:RC799-869 ,lcsh:RC648-665 ,inherited tubulopathy ,business.industry ,medicine.disease ,Hypokalemia ,Gitelman′s syndrome ,lcsh:Diseases of the digestive system. Gastroenterology ,multiple pituitary hormone deficiencies ,medicine.symptom ,business ,Hormone - Abstract
Gitelman's syndrome is an inherited tubulopathy affecting thiazide-sensitive sodium chloride cotransporter, which manifests with hypokalemic alkalosis, hypomagnesemia, and hypocalciuria. Recently few cases have been described having an association of Gitelman's syndrome with pituitary abnormalities on imaging, though with normal hormonal status. We describe the first case of an adult patient having Gitelman's syndrome and hypopituitarism with abnormal pituitary imaging. She presented to us with hypotension, hypokalemia, hypomagnesemia with alkalosis, hypothyroidism, hypocortisolism, and hypogonadism. She was treated with replacement of electrolytes and hormones, to which she showed an excellent response.
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- 2012
21. Extensive Mongolian Spots with Autosomal Dominant Inheritance
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Beeregowda, YC, Naveen, Kumar BV, and Manjunatha, YC
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Inborn Error of Metabolism ,Mongolian Spots ,Dermal Melanocytosis ,Birth Marks ,Case Report - Abstract
Background Mongolian spots are benign skin markings at birth which fade and disappear as the child grows. Often persistent extensive Mongolian spots are associated with inborn error of metabolism. We report thirteen people of the single family manifested with extensive Mongolian spots showing autosomal dominant inheritance. Case Presentation A one day old female child, product of second degree consanguineous marriage, born by normal vaginal delivery with history of meconium stained amniotic fluid and birth asphyxia. On examination the child showed extensive bluish discoloration of the body involving trunk and extremities in both anterior and posterior aspects associated with bluish discoloration of the tongue. A detailed family history revealed most of the family members manifested with extensive bluish discoloration of the body soon after birth which faded in the first few years of life and completely disappeared by puberty. Thus it was diagnosed to be extensive Mongolian spots with an autosomal dominant inheritance. Conclusion Knowledge about the natural history of extensive Mongolian spots, their inheritance and association with certain metabolic diseases mainly IEM and Mucopolysaccharidosis aids in the diagnosis and in order to improve the patient's prognosis.
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- 2012
22. Vitreous hemorrhage following inadvertent intra-ocular injection of botulinum toxin
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Sanjiv Kumar Gupta, Siddharth Agrawal, Singh, and Kumar Bv
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Ophthalmology ,medicine.medical_specialty ,lcsh:Ophthalmology ,business.industry ,lcsh:RE1-994 ,Vitreous hemorrhage ,medicine ,medicine.disease ,business ,Letters to the Editor ,Botulinum toxin ,medicine.drug - Published
- 2015
23. Gloriosa superba ingestion: Hair loss and acute renal failure
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Ram, R, primary, Sridhar, MS, additional, Kumar, VS, additional, Khanam, PS, additional, Sangeetha, B, additional, Kumar, BV, additional, Kiran, U, additional, and Priyadarshini, PI, additional
- Published
- 2015
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24. Structure of the human pancreatic cholesterol esterase gene
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Louis G. Lange, Jose A. Aleman-Gomez, Matthew S. Bosner, Kumar Bv, Niall S. Colwell, C. A. Spilburg, Mark E. Lowe, and Lopez-Candales A
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Sequence analysis ,RNA Splicing ,Molecular Sequence Data ,Restriction Mapping ,PLCD4 ,Protein Sorting Signals ,Biology ,Biochemistry ,Exon ,Start codon ,Complementary DNA ,Humans ,Cloning, Molecular ,Promoter Regions, Genetic ,Pancreas ,Gene ,Genetics ,Base Sequence ,Nucleic acid sequence ,Nucleic Acid Hybridization ,DNA ,Exons ,Sterol Esterase ,Molecular biology ,Introns ,Protein Biosynthesis ,AKT1S1 ,DNA Probes - Abstract
The gene for human pancreatic cholesterol esterase consists of 11 exons and 10 introns and is 9.2 kb in length. The last and longest exon (841 nucleotides) is unique to the human gene. Functional amino acids are encoded on separate exons. The leader sequence is encoded by a single exon which carries two additional N-terminal amino acids of the mature functional protein. A positive TATA element is identified 43 nucleotides from the start codon. Pulse-field gel electrophoresis and hybridization with various cDNA probes and direct sequence data revealed the existence of a CEase-like gene. Partial sequence analysis of this gene from a human cosmid library and human genomic DNA showed a premature stop signal in exon 10, shortly after the codon for the active-site histidine. Both the functional gene and the CEase-like gene have a polyadenylation signal in the 3'-untranslated region. Thus, the complex gene structure for this intestinally active enzyme may provide in part a potential molecular explanation for the well-known heterogeneity of the intestinal absorption of cholesterol.
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- 1992
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25. Gloriosa superba ingestion: Hair loss and acute renal failure
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Priyadarshini Pi, Rapur Ram, Sridhar Ms, Kiran U, B Sangeetha, V. Kumar, Kumar Bv, and Khanam Ps
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Cardiotoxicity ,Pathology ,medicine.medical_specialty ,biology ,business.industry ,fungi ,hair loss ,food and beverages ,Physiology ,Acute intoxication ,Case Report ,macromolecular substances ,lcsh:Diseases of the genitourinary system. Urology ,lcsh:RC870-923 ,medicine.disease ,biology.organism_classification ,Acute renal failure ,Hair loss ,Nephrology ,Toxicity ,medicine ,Ingestion ,Gloriosa superba ,business - Abstract
Gloriosa superba is a plant that grows wild in several parts of South India. Tubers of this plant contain several alkaloids. Acute intoxication following the ingestion of G. superba results in gastrointestinal and haematological abnormalities, hepatic and renal insufficiency, cardiotoxicity and hair loss. We present a case with typical features of G superba toxicity.
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- 2015
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26. Measurement of Vibration-Induced Stress Relief in the Heavy Fabrication Industry
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Ohol, RD, primary, Nagendra Kumar, BV, additional, and Noras, RA, additional
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27. PO-0197 Bacterial Culture Versus Pcr For Etiologic Diagnosis Of Community Acquired Pneumonia- Results From Capes (community Acquired Pneumonia Etiology Study)
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Mathew, JL, primary, Singhi, S, additional, Ray, P, additional, Ravi Kumar, BV, additional, Bansal, A, additional, and Nilsson, A, additional
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- 2014
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28. Robust approach for palm (Roi) extraction in palmprint recognition system
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Shekhar, Subhashrahul, primary, Kumar, BV Sravan, additional, and Ramesh, S, additional
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- 2012
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29. BIOLOGY OF NEUROCYSTICERCOSIS – PARASITE RELATED FACTORS MODULATING HOST RESPONSE
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SHANKAR, SK, primary, SURYANARAYANA, V, additional, VASANTHA, S, additional, RAVI, V, additional, and KUMAR, BV RAVI, additional
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- 1994
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30. Protective Effects of Amphotericin B Against Spontaneous and Transplantable Murine Tumors 2
- Author
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Richard G. Lynch, Kumar Bv, Gerald Medoff, and F Valeriote
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Cancer Research ,Pathology ,medicine.medical_specialty ,Tumor incidence ,biology ,business.industry ,Low dose ,Pharmacology ,medicine.disease ,biology.organism_classification ,BALB/c ,Lymphoma ,Oncology ,Amphotericin B ,Medicine ,Neoplasm ,Tumor growth ,business ,medicine.drug ,Rate of growth - Abstract
Two tumor systems were used to test prophylactic effects of amphotericin B (AmB). When 0.5 mg AmB was given ip every 2 weeks to AKR mice beginning at 8 weeks of age, the 50% tumor incidence for spontaneous lymphoma development was delayed 2-3 months. In the second tumor system, BALB/c mice received injections of either 20 or 50 mug AmB before receiving MOPC-315-C cells sc. The mice given the low dose of AmB demonstrated a decreased tumor incidence and a reduced tumor growth rate, when compared with controls. Opposite effects were found for the group administered the high dose; tumor incidence and rate of growth were increased.
- Published
- 1976
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31. Comparison of the ribonucleic acid polymerases from both phases of Histoplasma capsulatum
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George S. Kobayashi, Gutwein M, Kumar Bv, McMillian Ra, and Gerald Medoff
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chemistry.chemical_classification ,Amanitins ,biology ,Protein subunit ,Histoplasma ,Osmolar Concentration ,Temperature ,RNA ,DNA-Directed RNA Polymerases ,Ribonucleoside ,Biochemistry ,Yeast ,Kinetics ,Enzyme ,chemistry ,biology.protein ,Magnesium ,Dimorphic fungus ,Polymerase ,Mycelium - Abstract
The three ribonucleic acid (RNA) polymerases (ribonucleoside triphosphate RNA nucleotidyltransferases, EC 2.7.7.6) of the two phases (yeast and mycelial) of the dimorphic fungus Histoplasma capsulatum have been purified and characterized. The corresponding enzymes from the two phases differ in sensitivity to alpha-amanitin, ion and salt requirements, temperature sensitivity, and subunit structure. This is the first case in which such qualitative differences in RNA polymerases have been demonstrated in two growth states of the same organism.
- Published
- 1980
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32. Sulfhydryl induced respiratory 'shunt' pathways and their role in morphogenesis in the fungus, Histoplasma capsulatum
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SACCO, Margherita, MEDOFF G, LAMBOWITS AM, KUMAR BV, KOBAYASHI GS, PAINTER A., Sacco, Margherita, Medoff, G, Lambowits, Am, Kumar, Bv, Kobayashi, G, and Painter, A.
- Abstract
When the mycelial to yeast transition of the dimorphic fungus Histoplasma capsulatum is induced by a temperature shift from 25 to 37 degrees C, the activities of the cytochrome system and the alternate oxidase decrease in parallel over the first 24 to 40 h (stage 1 of the transition). The decrease in activity of the cytochrome system is correlated with extensive decreases in the amounts of cytochromes b, c, and aa3, assayed spectrophotometrically. After 40 h, the cells enter a dormant phase (stage 2 of the transition) and cysteine or other sulfhydryl-containing compounds are required to reactivate mitochondrial respiration. This reactivation is due to the establishment of shunt pathways which bypass blocked segments of the electron transport system. The "shunt" pathways operate normally in mycelia grown at 25 degrees C, but are shut down during the transition, possibly because of depletion of intracellular cysteine. The longstanding observation that cysteine is required to progress beyond the initial stages of the morphological transition may be due, at least in part, to the reactivation of these "shunt" pathways.
- Published
- 1983
33. Thermodynamic properties of Cr Mo solid alloys
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Jacob, KT and Kumar, BV
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Materials Engineering (formerly Metallurgy) - Abstract
The activity of Cr in solid Cr-Mo alloys has been measured at 1873 K using a metal-oxide-gas equilibrium technique. Thin foils of Mo were equilibrated with solid Cr203 under flowing gas mixtures of argon, hydrogen and watervapourof known composition. The equilibrium concentration of Cr in Mo was determined by chemical analysis. These measurements indicate positive deviations from Raoult's law. The activity data obtained in the study at 1873 K are combined with free energy of mixing at 1471 K, calorimetric enthalpy of mixing at 1673 K, and experimental evidence of phase separation at lower temperatures, reported in the literature, to obtain an optimised set of thermodynamic parameters for the Cr-Mosystem in the solid state.
- Published
- 1986
34. Alloy/Oxide Equilibria in Iron--Vanadium--Oxygen and Iron--Niobium--Oxygen Systems
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Jacob, KT and Kumar, BV
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Materials Engineering (formerly Metallurgy) - Abstract
An experimental characterization of three-phase equilibria in Fe--V--O and Fe--Nb--O systems at 1823, 1873 and 1923K has been carried out using a solid state cell and by analysis of quenched samples. The oxygen potentials corresponding to these three-phase equilibria were monitored by a solid state cell incorporating Y sub 2 O sub 3 doped ThO sub 2 with Cr + Cr sub 2 O sub 3 as reference electrode. Similar measurements were carried out for Fe--Nb--O alloys in equilibrium with a mixture of FeNb sub 2 O sub 6 and NbO sub 2 . These measurements permit evaluation of interaction parameters (e exp V sub O = --6590/T + 2.892 and e exp Nb sub O = --4066/T + 1.502) and activity coefficients of vanadiun and niobium in dilute solution (ln gamma exp O sub V = --35 320/T + 12.68 and ln gamma sub Nb exp O = --12 386/T + 4.34) in liquid iron. The results obtained in this study resolve a number of discrepancies in thermodynamic data reported in the literature, especially regarding the activity coefficients of V and Nb and the stability ranges for V sub 2 O sub 3 and VO sub 1+x . 18 ref.--AA
- Published
- 1987
35. Longterm maintenance of human naive T cells through in situ homeostasis in lymphoid tissue sites
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Thome, JJC, primary, Grinshpun, B, additional, Kumar, BV, additional, Kubota, M, additional, Ohmura, Y, additional, Lerner, H, additional, Sempowski, GD, additional, Shen, Y, additional, and Farber, DL, additional
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36. Purification and characterization of a cysteine dioxygenase from the yeast phase of Histoplasma capsulatum
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Gerald Medoff, Vijaya Kumar, Robert Goewert, George S. Kobayashi, Margherita Sacco, Bruno Maresca, Kumar, Bv, Maresca, B, Sacco, Margherita, Goewert, R, Kobayashi, G, and Medoff, M.
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chemistry.chemical_classification ,biology ,Chemistry ,Histoplasma ,Cysteine Dioxygenase ,Cysteine dioxygenase ,Fungus ,biology.organism_classification ,Biochemistry ,Peptide Fragments ,In vitro ,Dioxygenases ,Substrate Specificity ,Enzyme ,Dioxygenase ,Flavin-Adenine Dinucleotide ,Oxygenases ,biology.protein ,Dimorphic fungus ,Mycelium ,Cysteine - Abstract
A cysteine dioxygenase, cysteine oxidase (EC 1.13.11.20), has been purified from the cytosolic fraction of yeast phase cells of the dimorphic fungus Histoplasma capsulatum. The cysteine oxidase is an iron-containing dioxygenase with a molecular weight of 10500 (±1500) and is present only in the yeast phase of the fungus. The enzyme is highly specific for l-cysteine, with a Km of 2 × 10−5 M in vitro. The product of cysteine oxidation is cysteinesulfinic acid, as analyzed by thin-layer chromatography and mass spectroscopy. To our knowledge, this is the first cysteine oxidase isolated from a fungus, and it probably plays an important role in the mycelial to yeast phase transition of H. capsulatum during which redox potential and cysteine levels are crucial factors. © 1983, American Chemical Society. All rights reserved.
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- 1983
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37. Studies on phase transitions in the dimorphic pathogen Histoplasma capsulatum
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Bruno Maresca, George S. Kobayashi, Gerald Medoff, Margherita Sacco, B. V. Kumar, Kobayashi, G, Medoff, G, Maresca, B, Sacco, Margherita, and Kumar, Bv
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Sexual dimorphism ,Hypha ,medicine ,Zoology ,Subtropics ,Fungus ,Pathogenic fungus ,Biology ,medicine.disease ,biology.organism_classification ,Pathogen ,Mediterranean Basin ,Histoplasmosis - Abstract
Histoplasma capsulatum, the etiological agent of histoplasmosis, is a dimorphic pathogenic fungus. The disease histoplasmosis occurs in many different parts of the world, but has a particularly high prevalence in temperate and subtropical zones such as the Ohio and Mississippi river valleys of the United States, South and Central America, parts of the Mediterranean basin, and West Africa (P. Q. Edwards and Billings, 1971). The epidemiology of H. capsulatum and problems related to human infection have been extensively studied (Sweany, 1960; Ajello et al., 1971; Schwarz, 1981). The nature of dimorphism in H. capsulatum has also received a great deal of interest ever since the fungus was observed in tissue and cultured in vitro and discovered to have a saprophytic hyphal phase and a parasitic yeast phase (DeMonbreun, 1934).
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- 1985
38. Temperature- and cyclic nucleotide-induced phase transitions of Histoplasma capsulatum
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Gerald Medoff, Bruno Maresca, B. V. Kumar, Margherita Sacco, G. S. Kobayashi, Sacco, Margherita, Maresca, B, Kumar, Bv, Kobayashi, G, and Medoff, G.
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Oxygenase ,Histoplasma ,Cystine ,Biology ,Microbiology ,Dioxygenases ,chemistry.chemical_compound ,Cyclic nucleotide ,Oxygen Consumption ,Theophylline ,Cyclic AMP ,Morphogenesis ,NADH, NADPH Oxidoreductases ,Nerve Growth Factors ,Cystine reductase ,Molecular Biology ,chemistry.chemical_classification ,Aspirin ,Prostaglandins E ,Cysteine Dioxygenase ,Temperature ,biology.organism_classification ,Yeast ,Enzyme ,chemistry ,Biochemistry ,Oxygenases ,sense organs ,Intracellular ,Research Article - Abstract
The transition from yeast to mycelia of Histoplasma capsulatum could be accomplished by shifting the temperature of incubation from 37 to 25 degrees C. It was accompanied by many changes in cellular metabolism, including changes in respiration, intracellular cyclic adenosine 3',5'-monophosphate (cAMP) levels, and activities of two enzymes specific for the yeast phase, cystine reductase (EC 1.6.4.1) and cysteine oxidase (EC 1.13.11.20). Even at 37 degrees C, the yeast to mycelial transition could be induced by cAMP and agents which raise the intracellular levels of cAMP (theophylline, acetylsalicylic acid, prostaglandin E1, and nerve growth factor). During this morphogenesis the same pattern of changes occurred as in the temperature-induced transition. Therefore, these changes were not simply dependent on a shift in temperature, but rather were part of the process of the phase transition.
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- 1981
39. RED: Retinoscopy using endoscopy device.
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Chandrakanth P, Kasturi N, Kumar BV, Kosalram A, and Venkataramanan P
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- 2024
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40. Establishment of Age Specific Reference Interval for Aminoacids and Acylcarnitine in Dried Blood Spot by Tandem Mass Spectrometry.
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Kumar BV, Kadiyala P, Ponmalar P, Pauline L, and Srinivasan S
- Abstract
The Extended Screening for Inborn Errors of Metabolism is done for aminoacidopathies, fatty acid oxidation disorders and organic acid disorders. In a single dried blood spot, the tandem mass spectrometry is capable of measuring multiple analytes like amino acids, acylcarnitines, nucleosides, succinylacetone and lysophosphatidylcholines. This study was proposed to establish age specific reference internal for aminoacids and acylcartinitine in dried blood spot by tandem mass spectrometry. A total of 480 apparently healthy children were enrolled for the study and sub classified into four groups as follows: Group A: 0-1 month, Group B: 1 month-1 year, Group C: 1-5 year and Group D: 5-12 years each having 120 participants. Sample size were calculated as per CLSI approved guidelines. Tables 1 and 2 presents the age-specific percentile distribution of aminoacids and acylcarnitines established from healthy subjects as per rank-based method recommended by the IFCC and CLSI. Tables 3, 4 and 5 presents the cut-off values of primary and secondary marker/ratios for screening of aminoacidopathies, fatty acid oxidation disorders and organic acid disorders respectively. As a general principle, the interpretation of extended newborn screening results should be based on age specific cut-off established by the laboratory for primary analyte concentration and secondary analyte concentration/ ratios. This study was useful in establishing age specific cut-off values for various amino acids and acylcarnitines in South Indian population. [Table: see text] [Table: see text] [Table: see text] [Table: see text] [Table: see text]., Competing Interests: Conflict of interestNo potential conflict of interest relevant to this article was reported., (© The Author(s), under exclusive licence to Association of Clinical Biochemists of India 2023, corrected publication 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.)
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- 2024
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41. Discovery of Novel TLR7 Agonists as Systemic Agent for Combination With aPD1 for Use in Immuno-oncology.
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Poudel YB, He L, Cox M, Zhang Q, Johnson WL, Cong Q, Cheng H, Chowdari NS, Tarby C, Donnell AF, Broekema M, O'Malley DP, Zhang Y, A M Subbaiah M, Kumar BV, Subramani L, Wang B, Li YX, Sivaprakasam P, Critton D, Mulligan D, Sandhu B, Xie C, Ramakrishnan R, Nagar J, Dudhgaonkar S, Oderinde MS, Murtaza A, Schieven GL, Mathur A, Gavai AV, Vite G, and Gangwar S
- Abstract
We have designed and developed novel and selective TLR7 agonists that exhibited potent receptor activity in a cell-based reporter assay. In vitro , these agonists significantly induced secretion of cytokines IL-6, IL-1β, IL-10, TNFa, IFNa, and IP-10 in human and mouse whole blood. Pharmacokinetic and pharmacodynamic studies in mice showed a significant secretion of IFNα and TNFα cytokines. When combined with aPD1 in a CT-26 tumor model, the lead compound showed strong synergistic antitumor activity with complete tumor regression in 8/10 mice dosed using the intravenous route. Structure-activity relationship studies enabled by structure-based designs of TLR7 agonists are disclosed., Competing Interests: The authors declare no competing financial interest., (© 2024 American Chemical Society.)
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- 2024
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42. Safety and Efficacy of OPN Balloon in Patients With Calcified Coronary Artery Disease.
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Senguttuvan NB, Singh H, Kumar BV, Kongara RC, Abdulkader RS, Anandaram A, Krishnamurthy P, Balasubramaniyan JV, Sadhanandham S, Ramesh S, Manokar P, Muralidharan TR, Murthy JSN, and Thanikachalam S
- Subjects
- Humans, Prospective Studies, Coronary Angiography, Treatment Outcome, Stents, Coronary Artery Disease diagnostic imaging, Coronary Artery Disease therapy, Angioplasty, Balloon, Coronary, Atherectomy, Coronary methods, Vascular Calcification diagnostic imaging, Vascular Calcification therapy
- Abstract
Background: Patients with symptomatic calcified coronary lesions have poor outcomes. Such lesions require additional atherectomy devices for bed preparation., Aim: To assess the safety and efficacy of OPN balloon in patients with calcified coronary lesions., Methods: This is an investigator-initiated, prospective, observational study. The primary outcome of the study was a procedural success., Results: We studied 71 patients (133 lesions). Maximum lesions were located in LAD [46.6 %]. The OPN balloon was used for pre-dilatation alone in 28.6 % (Pre-stent OPN group), post-dilatation alone in 63.2 % of lesions (Post-stent OPN group), and in both situations in 8.3 % of lesions with procedural success in 98.5 % of patients. Further dilatation with different NC balloons was required in both groups (30 %). The median (IQR) OPN balloon diameter in the pre- and post-stent OPN group were 2.5 (2.5, 3.0) and 3.0 (3.0,3.0) mm (p = 0.001), respectively. The difference between the diameter of the stent and OPN balloon used in pre-stent OPN group was 0.5 (0.2, 0.5) mm while it was 0.0 (0.0,0.2) mm in the post-stent OPN group (p < 0.001). Eight complications and two deaths occured. Distal shaft rupture was also noticed., Conclusion: OPN balloon is safe, and effective in treating calcified coronary lesions. We propose to undersize the balloon by 0.5 mm for pre-dilatation followed by 0.25 mm larger NC balloon if needed. In the post-dilatation group, use a 1:1 size balloon in a non-tortuous straight segment. Use imaging especially when (1) the pressure taken more than the rated burst pressure, (2) an OPN balloon size is ≥3 mm (3) using 1:1 size OPN balloon in a tortuous segment., (Copyright © 2023 Elsevier Inc. All rights reserved.)
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- 2023
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43. Optimization of sodium alginate-galactoxyloglucan blended hydrogel beads through ionotropic gelation method.
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Muthumari B, Kumar BV, Kavitha M, Kumar JKJP, Arumugam N, and Basu MJ
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- Spectroscopy, Fourier Transform Infrared, Biopolymers, Hydrogen-Ion Concentration, Hydrogels chemistry, Alginates chemistry
- Abstract
Hydrogels are 3D crosslinking networks of hydrophilic biopolymers which can able to absorb and retain large amount of water. In this present study, the Sodium alginate (SA)- Galactoxyloglucan (GXG) blended hydrogel beads were prepared and optimized through two level optimization steps. Alginate and xyloglucan are the cell wall polysaccharides biopolymers obtained from the plant sources, Sargassum sp. and Tamarindus indica L. respectively. The extracted biopolymers were confirmed and characterized by UV-Spectroscopy, FT-IR, NMR and TGA analysis. Based on the hydrophilicity, non-toxicity and biocompatibility, SA-GXG hydrogel were prepared and optimized through two-level optimization steps. The optimized hydrogel bead formulation was characterized through FT-IR, TGA and SEM analysis. From the obtained result, it is found that the polymeric formulation GXG (2 % w/v)-SA (1.5 % w/v), cross-linker (CaCl
2 ) concentration at 0.1 M and the cross-linking time at 15 Min showed significant swelling index. The optimized hydrogel beads are porous and show good swelling capacity and thermal stability. The optimized protocol of hydrogel beads may be useful in designing hydrogel beads for specific applications in agricultural, Biomedical and remediation sectors., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023 Elsevier B.V. All rights reserved.)- Published
- 2023
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44. Ulam-Hyers stability of tuberculosis and COVID-19 co-infection model under Atangana-Baleanu fractal-fractional operator.
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Selvam A, Sabarinathan S, Senthil Kumar BV, Byeon H, Guedri K, Eldin SM, Khan MI, and Govindan V
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- Humans, Fractals, Intention, Coinfection, COVID-19
- Abstract
The intention of this work is to study a mathematical model for fractal-fractional tuberculosis and COVID-19 co-infection under the Atangana-Baleanu fractal-fractional operator. Firstly, we formulate the tuberculosis and COVID-19 co-infection model by considering the tuberculosis recovery individuals, the COVID-19 recovery individuals, and both disease recovery compartment in the proposed model. The fixed point approach is utilized to explore the existence and uniqueness of the solution in the suggested model. The stability analysis related to solve the Ulam-Hyers stability is also investigated. This paper is based on Lagrange's interpolation polynomial in the numerical scheme, which is validated through a specific case with a comparative numerical analysis for different values of the fractional and fractal orders., (© 2023. The Author(s).)
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- 2023
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45. Precise Sn-Doping Modulation for Optimizing CdWO 4 Nanorod Photoluminescence.
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Manjunatha K, Ho MK, Hsu TE, Chiu HH, Li TY, Kumar BV, Reddy PM, Chan TS, Wu YH, Lin BH, Karmenyan A, Cheng CL, Gandhi AC, and Wu SY
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- Luminescence, X-Ray Diffraction, Cadmium, Nanotubes
- Abstract
The cadmium tungstate rods have been given much attention due to their potential for usage in numerous luminescent applications. We have prepared single crystalline Sn-doped Cd
1-x Snx WO4 (where x = 0, 1, 3, and 5%) nanorods (NRDs) and characterized them using refined X-ray diffraction and TEM analysis, revealing a monoclinic phase and a crystallite size that decreased from 62 to 38 nm as Sn concentration increased. Precise Sn doping modulation in CdWO4 NRDs causes surface recombination of electrons and holes, which causes the PL intensity to decrease as the Sn content rises. The chromaticity diagram shows that an increase in the Sn content caused a change in the emission color from sky blue to light green, which was attributed to the increased defect density. The photoluminescence time decay curve of all samples fit well with double-order exponential decay, and the average decay lifetime was found to be 1.11, 0.93, and 1.16 ns for Cd1-x Snx WO4 , x = 0, 1, and 5%, respectively. This work provides an understanding of the behavior of Sn-doped CdWO4 NRDs during electron transitions and the physical nature of emission that could be used in bio-imaging, light sources, displays, and other applications.- Published
- 2022
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46. Tunable luminescence from Bi 3+ sensitized La 2 Zr 2 O 7 :Eu 3+ red nanophosphors for display applications.
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Naveen Kumar BV, Venkata Rao K, Basha Shaik E, Nirmal Rajeev Y, Ramachandra Rao K, and Cole S
- Abstract
Bismuth ion (Bi
3+ ) sensitized, europium ion (Eu3+ ) activated La2 Zr2 O7 nanophosphors are prepared successfully by simple wet chemical method. Strong blue emission of singly doped La2 Zr2 O7 with Bi3+ was observed at 310 nm excitation, its wide emission spectrum has a peak maximum at 465 nm ascribed to electronic transition3 P1 →1 S0 of Bi3+ . The recorded photoluminescence spectra of y at% Eu3+ codoped La2 Zr2 O7 , when excited at 285 nm, the emission spectrum exhibits maximum peaks at wavelength values 615 nm, 646 nm and 665 nm which are ascribed to5 D0 →7 F2 ,5 D0 →7 F3 and5 D0 →7 F4 transitions of Eu3+ respectively. The chromaticity coordinates for the optimized sample were found to be (0.519, 0.329). Sensitizing with Bi3+ can affect the luminescence properties of La2 Zr2 O7 :Eu3+ phosphors. With reference to the change in Eu3+ concentration from Y = 1, 2, 3, 4 and 5%, color tunable luminescence from blue to orange, red of La2 Zr2 O7 :Bi3+ ,Eu3+ phosphors are observed. The lifetime decay values, energy level description and CIE chromatic color coordinates for Bi3+ , Eu3+ in La2 Zr2 O7 :Bi3+ ,Eu3+ codoped sample was discussed. The spectral overlap between sensitizer, activator ions confirms the efficient energy transfer from Bi3+ to Eu3+ in La2 Zr2 O7 :Bi3+ ,Eu3+ codoped sample and is via a dipole-quadruple mechanism., (© 2022 John Wiley & Sons Ltd.)- Published
- 2022
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47. Atypical MYC rearrangement pattern of 3' deletion and 5' amplification along with independent IGH rearrangement: A case study.
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Kandoor S, Kate U, Deb P, Mehta SS, Kanda Kumar BV, and Pais AP
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- Humans, In Situ Hybridization, Fluorescence, Cyclophosphamide, Doxorubicin, Lymphoma, Large B-Cell, Diffuse, Lymphoma, Non-Hodgkin
- Abstract
A spectrum of Cellular homolog of the v-myc oncogene (cMYC) alterations such as translocation, overexpression, mutation, and amplification plays an important role in lymphomagenesis, particularly in high-grade lymphomas, and are associated with prognostic significance. Accurate identification of cMYC gene alteration is important for diagnostic, prognostic, and therapeutic implications. With the application of different FISH (fluorescence in situ hybridization) probes that helped overcome the analytical diagnostic challenges as a result of variant patterns, we report rare, concomitant, and independent gene alterations in cMYC and Immunoglobulin heavy-chain gene (IGH) with detailed characterization of its variant rearrangement. Short-term follow-up post R-CHOP (rituximab plus cyclophosphamide, doxorubicin, vincristine, and prednisone) therapy seemed to be favorable. Accumulation of many more literature studies on such cases with their therapeutic implications would lead to the categorization of these cases as a separate subclass in large B-cell lymphomas followed by molecular targeted therapy.
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- 2022
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48. Comparison of Oral Mucosal Biopsies Done Using Scalpel and Diode Lasers: A Vivo Study.
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Gundlapalle P, Nagappan N, Ramesh P, Ziauddhin S, Karthick BP, Paleti VSM, and Kumar BV
- Abstract
Background: As dental lasers are becoming more popular in the branch of oral medicine for its various advantages and applications, this study was carried out to evaluate better mode of obtaining oral biopsies which is a common and inevitable procedure for providing final diagnosis in majority of conditions., Methodology: In this study, a total of 60 patients who required biopsy for final diagnosis of oral mucosal lesions as part of diagnosis in department of Oral Medicine were selected, out of which 30 were subjected to scalpel biopsies and 30 patients were subjected to diode laser biopsies. A 980 nm Zolar plus diode laser was used for the study. Out of 30 patients who were subjected to laser biopsies, 3W continuous mode settings were used for 15 patients and 3W pulsed mode was used for 15 patients. The specimens were sent to Department of Oral Pathology for histopathological evaluation to provide the final diagnosis. The time taken for each patient, volume of local anesthesia, during operative, postoperative pain scale, and co-relation of provisional and final diagnosis was noted for comparison purpose and the pathologist comments, peripheral tissue damage and artifact's for each slide were noted., Results: The study results showed the postoperative pain was comparatively less in diodlaser than scalpel, the lasers were patient friendly as the heammorage was negligible when compared to scalpel and suturing was not required. The pulsed mode in diode laser was advantageous over continuous mode when amount of thermal damage and postoperative pain score was compared., Conclusion: The results showed that oral biopsies can be made better using diode lasers, by having thorough knowledge on the device., Competing Interests: There are no conflicts of interest., (Copyright: © 2022 Journal of Pharmacy and Bioallied Sciences.)
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- 2022
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49. A machine learning-based approach to determine infection status in recipients of BBV152 (Covaxin) whole-virion inactivated SARS-CoV-2 vaccine for serological surveys.
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Singh P, Ujjainiya R, Prakash S, Naushin S, Sardana V, Bhatheja N, Singh AP, Barman J, Kumar K, Gayali S, Khan R, Rawat BS, Tallapaka KB, Anumalla M, Lahiri A, Kar S, Bhosale V, Srivastava M, Mugale MN, Pandey CP, Khan S, Katiyar S, Raj D, Ishteyaque S, Khanka S, Rani A, Promila, Sharma J, Seth A, Dutta M, Saurabh N, Veerapandian M, Venkatachalam G, Bansal D, Gupta D, Halami PM, Peddha MS, Veeranna RP, Pal A, Singh RK, Anandasadagopan SK, Karuppanan P, Rahman SN, Selvakumar G, Venkatesan S, Karmakar MK, Sardana HK, Kothari A, Parihar DS, Thakur A, Saifi A, Gupta N, Singh Y, Reddu R, Gautam R, Mishra A, Mishra A, Gogeri I, Rayasam G, Padwad Y, Patial V, Hallan V, Singh D, Tirpude N, Chakrabarti P, Maity SK, Ganguly D, Sistla R, Balthu NK, A KK, Ranjith S, Kumar BV, Jamwal PS, Wali A, Ahmed S, Chouhan R, Gandhi SG, Sharma N, Rai G, Irshad F, Jamwal VL, Paddar MA, Khan SU, Malik F, Ghosh D, Thakkar G, Barik SK, Tripathi P, Satija YK, Mohanty S, Khan MT, Subudhi U, Sen P, Kumar R, Bhardwaj A, Gupta P, Sharma D, Tuli A, Ray Chaudhuri S, Krishnamurthi S, Prakash L, Rao CV, Singh BN, Chaurasiya A, Chaurasiyar M, Bhadange M, Likhitkar B, Mohite S, Patil Y, Kulkarni M, Joshi R, Pandya V, Mahajan S, Patil A, Samson R, Vare T, Dharne M, Giri A, Mahajan S, Paranjape S, Sastry GN, Kalita J, Phukan T, Manna P, Romi W, Bharali P, Ozah D, Sahu RK, Dutta P, Singh MG, Gogoi G, Tapadar YB, Babu EV, Sukumaran RK, Nair AR, Puthiyamadam A, Valappil PK, Pillai Prasannakumari AV, Chodankar K, Damare S, Agrawal VV, Chaudhary K, Agrawal A, Sengupta S, and Dash D
- Subjects
- COVID-19 Vaccines therapeutic use, Humans, Machine Learning, Pandemics, SARS-CoV-2, Vaccines, Inactivated, Virion, COVID-19 epidemiology, COVID-19 prevention & control, Viral Vaccines
- Abstract
Data science has been an invaluable part of the COVID-19 pandemic response with multiple applications, ranging from tracking viral evolution to understanding the vaccine effectiveness. Asymptomatic breakthrough infections have been a major problem in assessing vaccine effectiveness in populations globally. Serological discrimination of vaccine response from infection has so far been limited to Spike protein vaccines since whole virion vaccines generate antibodies against all the viral proteins. Here, we show how a statistical and machine learning (ML) based approach can be used to discriminate between SARS-CoV-2 infection and immune response to an inactivated whole virion vaccine (BBV152, Covaxin). For this, we assessed serial data on antibodies against Spike and Nucleocapsid antigens, along with age, sex, number of doses taken, and days since last dose, for 1823 Covaxin recipients. An ensemble ML model, incorporating a consensus clustering approach alongside the support vector machine model, was built on 1063 samples where reliable qualifying data existed, and then applied to the entire dataset. Of 1448 self-reported negative subjects, our ensemble ML model classified 724 to be infected. For method validation, we determined the relative ability of a random subset of samples to neutralize Delta versus wild-type strain using a surrogate neutralization assay. We worked on the premise that antibodies generated by a whole virion vaccine would neutralize wild type more efficiently than delta strain. In 100 of 156 samples, where ML prediction differed from self-reported uninfected status, neutralization against Delta strain was more effective, indicating infection. We found 71.8% subjects predicted to be infected during the surge, which is concordant with the percentage of sequences classified as Delta (75.6%-80.2%) over the same period. Our approach will help in real-world vaccine effectiveness assessments where whole virion vaccines are commonly used., (Copyright © 2022 The Author(s). Published by Elsevier Ltd.. All rights reserved.)
- Published
- 2022
- Full Text
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50. Long-term outcomes of pars plana Ahmed valve implant and vitrectomy in eyes with refractory glaucoma.
- Author
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Dubay SK, Dwarika D, Bhola R, and Kumar BV
- Abstract
Background: Pars plana vitrectomy with implantation of an Ahmed glaucoma valve in the vitreous cavity has been reported with a success rate in the management of refractory and neovascular glaucoma. This study aimed to present the outcomes of pars plana Ahmed glaucoma valve (PPAV) surgical implantation in cases with refractory glaucoma., Methods: In this single-center, retrospective, comparative study, 87 consecutive patients diagnosed with refractory glaucoma who underwent PPAV surgical implantation between October 2015 and October 2019 were evaluated. A successful postoperative outcome was defined as intraocular pressure (IOP) ≤ 21 mmHg upon examination and a reduction in the number of anti-glaucoma agents used at the latest follow-up., Results: Finally, 81 eyes of 78 patients with refractory glaucoma were included; 54 (66.66%) of the eyes had neovascular glaucoma. The mean follow-up was 20.65 ± 12.17 months (range: 2-52 months). The mean preoperative IOP was 40.01 ± 1.19 mmHg and reduced significantly to 16.73 ± 0.82 mmHg at the latest follow-up ( P < 0.001); a successful IOP outcome was achieved in 88.89% of eyes. The mean number of anti-glaucoma agents decreased significantly from 2.86 ± 0.09 preoperatively to 1.46 ± 0.11 at the latest follow-up (P < 0.001); while 61 (75.31%) of eyes had a reduction in the number of IOP lowering eye drops, and 14 (17.28%) had no need for IOP lowering eye drops., Conclusions: PPAV surgery is a successful procedure for IOP reduction in patients with refractory glaucoma. Our study demonstrated either reduction or elimination of IOP lowering eye drops postoperatively. Large scale studies with a comparison group, a longer follow-up, and having various subtypes of glaucoma are required as future research to confirm these outcomes., Competing Interests: None., (© Author(s).)
- Published
- 2022
- Full Text
- View/download PDF
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