132 results on '"Krishnan SK"'
Search Results
2. RESURGENCE OF MT MALARIA AMONGST TROOPS SERVING IN THE NORTH EAST
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Nayar Kr, Kalra As, and Krishnan Sk
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education.field_of_study ,medicine.medical_specialty ,business.industry ,Original ,Incidence (epidemiology) ,Population ,Malaria morbidity ,General Medicine ,North east ,medicine.disease ,Environmental health ,Epidemiology ,Chemoprophylaxis ,parasitic diseases ,medicine ,Malaria control ,education ,business ,Malaria - Abstract
Cases of MT malaria amongst troops serving in the North East are on the increase. Study of the malaria morbidity and mortality data of the past five years covering a population of about 1.65 lakhs revealed that there is a definite resurgence of malaria from an incidence of 0.39 per thousand in 1989 to 0.54 per thousand in 1992. Death due to malaria is a cause for concern especially since most of the troops are on chemoprophylaxis. A more realistic epidemiological approach to malaria control would be required to contain malaria.
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- 2017
3. Outcomes of intention to quit of Indian IT professionals.
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Krishnan SK and Singh M
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Intention to quit has been getting attention in the context of employee attrition, with focus on its antecedents. A related aspect that needs attention is the outcome of intention to quit, where little research has occurred, especially in the Indian context. The present study explores performance orientation, organizational deviance, and organizational citizenship behavior as outcomes of intention to quit of Indian IT professionals. These factors become critical in the context of human resource management because employees who want to quit may become less productive or even dysfunctional for the organization. Interviews and a questionnaire-based survey were used in this research. The survey was conducted using software professionals with work experience of less than four years, with the results based on 533 responses. The initial results show that as hypothesized, intention to quit does lead to less performance orientation, higher organizational deviance, and less organizational citizenship behavior. Further, exploration using structural equation modeling shows that performance orientation mediates the relationships between intention to quit and organizational citizenship behavior as well as between intention to quit and organizational deviance. This study's findings imply that organizations need to understand that employees with a high intention to quit can prove costly from multiple dimensions. © 2010 Wiley Periodicals, Inc. [ABSTRACT FROM AUTHOR]
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- 2010
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4. AN EPIDEMIOLOGICAL STUDY OF BLOOD PRESSURE AMONG SCHOOL CHILDREN
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MUKHOPADHYA, J, primary, KRISHNAN, SK, additional, and CHOUDHURY, RK, additional
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- 1996
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5. RESURGENCE OF MT MALARIA IN THE NORTH EAST: Author's Reply
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KRISHNAN, SK, primary
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- 1996
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6. RESURGENCE OF MT MALARIA AMONGST TROOPS IN THE NORTH EAST: Author's Reply
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KRISHNAN, SK, primary
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- 1994
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7. RESURGENCE OF MT MALARIA AMONGST TROOPS SERVING IN THE NORTH EAST
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KRISHNAN, SK, primary, NAYAR, KR, additional, and KALRA, AS, additional
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- 1994
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8. Multicenter Randomised Controlled Trial of Single versus Double Venous Outflow Reconstruction in Right lobe Living Donor Liver Transplantation- Venous Outflow in Liver Transplantation (VOLT) Trial.
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Reddy MS, Koneti AJ, Chaudhary A, Rammohan A, Yelakanti RB, Mallick S, Patcha R, Singh VP, Krishnan SK, Kumar N, Gopal PV, Rela M, and Sudhindran S
- Abstract
Objective: To compare early patency and outcomes of single outflow (SOT) and double outflow (DOT) reconstruction in right lobe living donor liver transplantation (RtLDLT) in a multicenter open-labelled randomized controlled trial., Summary Background Data: Optimum graft venous outflow is a key factor in determining outcomes of RtLDLT. There is no data directly comparing SOT and DOT technique of graft outflow reconstruction., Methods: Adult patients undergoing RtLDLT needing anterior sector vein (ASV) reconstruction were enrolled. Prosthetic graft was used to create a neo-middle hepatic vein (neoMHV). Web-based permuted block randomization was used to allocate patients to SOT or DOT (1:1) prior to graft implantation. Primary endpoint was neoMHV patency upto 6 weeks. Secondary endpoints were post-operative morbidity and survival. Intention-to-treat and as-treated analyses are reported., Results: Five centers randomized 219 patients to SOT (n=110) or DOT (n=109). Both groups were similar in baseline characteristics. SOT had better neoMHV patency at 2 weeks (92.5% vs. 82.9%, P=0.032), 4 weeks (84% vs. 69%, P=0.011) but not at 6 weeks (69.5% vs. 59.2%,P=0.124). Cox- proportional hazards analysis revealed DOT (HR- 1.56 (95%ci=1.02,2.4); P=0.041) and use of Dacron graft (HR-2.83(95% ci=1.16,6.94), P=0.023) as independent risk factors for neoMHV thrombosis. SOT was associated with better in-hospital survival (97.3% vs. 90.8%; P=0.044) but similar one-year survival (89% vs. 85%, P=0.340). SOT was associated with improved survival in patients who developed early allograft dysfunction or needed re-operation., Conclusions: SOT has better early neoMHV patency than DOT and may be associated with better early survival., Competing Interests: Conflict of interest: None to report, (Copyright © 2024 Wolters Kluwer Health, Inc. All rights reserved.)
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- 2024
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9. Mechanically Flexible, Large-Area Fabrication of Three-Dimensional Dendritic Au Films for Reproducible Surface-Enhanced Raman Scattering Detection of Nanoplastics.
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Carreón RV, Rodríguez-Hernández AG, Serrano de la Rosa LE, Gervacio-Arciniega JJ, and Krishnan SK
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The escalating crisis of nanoplastic pollution in water and food products demands the development of novel methodologies for detection and recycling. Despite various techniques available, surface-enhanced Raman scattering (SERS) is emerging as a highly efficient technique for the trace detection of micro/nanoplastics. However, the development of highly reproducible and stable, flexible SERS substrates that can be used for sensitive detection in environmental medium remains a challenge. Here, we report a fabrication of large-area, three-dimensional (3D), and highly flexible SERS substrate based on porous dendritic Au films onto a flexible indium tin oxide (ITO) substrate via facile, thermal evaporation of Au over the vacuum-compatible deep eutectic solvent (DES)-coated glass substrate and subsequent direct transfer process. The as-fabricated 3D dendritic Au/ITO flexible substrates can be used for ultrasensitive SERS detection of crystal violet (CV) as probe analyte molecules with the limit of detection (LOD) as low as 6.4 × 10
-15 M, with good signal reproducibility (RSD of 11.3%). In addition, the substrate showed excellent sensitivity in detecting nanoplastics such as poly(ethylene terephthalate) (200 nm) and polystyrene (100 nm) with LODs reaching up to 0.051 and 8.2 μg/mL, respectively. This work provides a facile approach for the preparation of highly flexible plasmonic substrates, showing great potential for the SERS detection of a variety of environmental pollutants.- Published
- 2024
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10. Quantifying abnormal writing kinematics in writer's cramp using a novel software platform.
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Vysakha KV, Radhakrishnan V, James P, Kumar BS, Susvirkar AA, Sarma G, Cherian A, Divya KP, Nair SK, and Kishore A
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- Humans, Male, Female, Biomechanical Phenomena physiology, Middle Aged, Adult, Aged, Dystonic Disorders physiopathology, Dystonic Disorders diagnosis, Software, Handwriting
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Background: Writer's cramp is a task-specific focal hand dystonia, which is diagnosed clinically. Quantification of defect in WC is done using clinical scales, while digitized platforms are lacking., Objective: To design and test a platform that can differentiate and quantify the abnormal kinematics of writing using a software interface and to validate it in adult-onset isolated writer's cramp (WC)., Methods: A native platform was designed using Java and Wacom Intuos pro tablet and the data analyzed using a MATLAB-based platform called Large Data-Based Evaluation of Kinematics in Handwriting (LEKH). We standardized this new platform by comparing the handwriting between patients with WC and age, and gender and education-matched healthy controls, using standard tasks to assess the kinematics., Results: Comparison of the writing of right-handed WC patients (N = 21) and 39 healthy controls (N = 39) showed that patients differed from controls in the frequency of strokes (P < 0.001), number of inversions of velocity (P < 0.001), number of breaks (P = 0.02), air time and paper time (P < 0.001)., Conclusions: Using the LEKH platform, the kinematic profile of patients with WC could be differentiated from healthy controls. Studies in larger samples will be needed to derive statistical models that can differentiate the flexion and extension types of WC which can help in muscle selection and to quantify the effects of treatment., Competing Interests: Declarations. Conflict of interest: None of the authors has any conflict of interest to disclose. Ethical approval: Written informed consent was obtained per institute guidelines for videotaping each subject and publishing. We confirm that we have read the Journal’s position on issues involved in ethical publication and affirm that this work is consistent with those guidelines., (© 2024. The Author(s) under exclusive licence to Belgian Neurological Society.)
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- 2024
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11. Exploring Metabolomics to Innovate Management Approaches for Fall Armyworm ( Spodoptera frugiperda [J.E. Smith]) Infestation in Maize ( Zea mays L.).
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Desika J, Yogendra K, Hepziba SJ, Patne N, Vivek BS, Ravikesavan R, Nair SK, Jaba J, Razak TA, Srinivasan S, and Shettigar N
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The Fall armyworm (FAW), Spodoptera frugiperda (J. E. Smith), is a highly destructive lepidopteran pest known for its extensive feeding on maize ( Zea mays L.) and other crops, resulting in a substantial reduction in crop yields. Understanding the metabolic response of maize to FAW infestation is essential for effective pest management and crop protection. Metabolomics, a powerful analytical tool, provides insights into the dynamic changes in maize's metabolic profile in response to FAW infestation. This review synthesizes recent advancements in metabolomics research focused on elucidating maize's metabolic responses to FAW and other lepidopteran pests. It discusses the methodologies used in metabolomics studies and highlights significant findings related to the identification of specific metabolites involved in FAW defense mechanisms. Additionally, it explores the roles of various metabolites, including phytohormones, secondary metabolites, and signaling molecules, in mediating plant-FAW interactions. The review also examines potential applications of metabolomics data in developing innovative strategies for integrated pest management and breeding maize cultivars resistant to FAW by identifying key metabolites and associated metabolic pathways involved in plant-FAW interactions. To ensure global food security and maximize the potential of using metabolomics in enhancing maize resistance to FAW infestation, further research integrating metabolomics with other omics techniques and field studies is necessary.
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- 2024
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12. A Scalable Synthesis of Ag Nanoporous Film As an Efficient SERS-Substrates for Sensitive Detection of Nanoplastics.
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Carreón RV, Rodríguez-Hernández AG, Serrano de la Rosa LE, Calixto ME, Gervacio-Arciniega JJ, and Krishnan SK
- Abstract
Nanoplastics pollution has led to a severe environmental crisis because of a large accumulation of these smaller nanoplastic particles in the aquatic environment and atmospheric conditions. Detection of these nanoplastics is crucial for food safety monitoring and human health. In this work, we report a simple and eco-friendly method to prepare a SERS-substrate-based nanoporous Ag nanoparticle (NP) film through vacuum thermal evaporation onto a vacuum-compatible deep eutectic solvent (DES) coated growth substrate for quantitative detection of nanoplastics in environmental samples. The nanoporous Ag NP films with controlled pores were achieved by the soft-templating role of DESs over the growth substrate, which enabled the self-assembly of deposited Ag NPs over the surface of DES. The optimized nanoporous Ag substrate provides high sensitivity in the detection of analyte molecules, crystal violet (CV), and rhodamine 6G (R6G) with a limit of detection (LOD) up to 1.5 × 10
-13 M, excellent signal reproducibility, and storage stability. Moreover, we analyzed quantitative SERS detection of polyethene terephthalate (PET, size of 200 nm) and polystyrene (PS, size of 100 nm) nanoplastics with an LOD of 0.38 and 0.98 μg/mL, respectively. In addition, the SERS substrate efficiently detects PET and PS nanoplastics in real environmental samples, such as tap water, lake water, and diluted milk. The enhanced SERS sensing ability of the proposed nanoporous Ag NP film substrate holds immense potential for the sensitive detection of various nanoplastic contaminants present in environmental water.- Published
- 2024
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13. Insights into maydis leaf blight resistance in maize: a comprehensive genome-wide association study in sub-tropics of India.
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Nisa WU, Sandhu S, Nair SK, Kaur H, Kumar A, Rashid Z, Saykhedkar G, and Vikal Y
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- India, Haplotypes, Plant Leaves genetics, Plant Leaves microbiology, Quantitative Trait Loci, Phenotype, Zea mays genetics, Zea mays microbiology, Disease Resistance genetics, Genome-Wide Association Study, Plant Diseases microbiology, Plant Diseases genetics, Polymorphism, Single Nucleotide
- Abstract
Background: In the face of contemporary climatic vulnerabilities and escalating global temperatures, the prevalence of maydis leaf blight (MLB) poses a potential threat to maize production. This study endeavours to discern marker-trait associations and elucidate the candidate genes that underlie resistance to MLB in maize by employing a diverse panel comprising 336 lines. The panel was screening for MLB across four environments, employing standard artificial inoculation techniques. Genome-wide association studies (GWAS) and haplotype analysis were conducted utilizing a total of 128,490 SNPs obtained from genotyping-by-sequencing (GBS)., Results: GWAS identified 26 highly significant SNPs associated with MLB resistance, among the markers examined. Seven of these SNPs, reported in novel chromosomal bins (9.06, 5.01, 9.01, 7.04, 4.06, 1.04, and 6.05) were associated with genes: bzip23, NAGS1, CDPK7, aspartic proteinase NEP-2, VQ4, and Wun1, which were characterized for their roles in diminishing fungal activity, fortifying defence mechanisms against necrotrophic pathogens, modulating phyto-hormone signalling, and orchestrating oxidative burst responses. Gene mining approach identified 22 potential candidate genes associated with SNPs due to their functional relevance to resistance against necrotrophic pathogens. Notably, bin 8.06, which hosts five SNPs, showed a connection to defense-regulating genes against MLB, indicating the potential formation of a functional gene cluster that triggers a cascade of reactions against MLB. In silico studies revealed gene expression levels exceeding ten fragments per kilobase million (FPKM) for most genes and demonstrated coexpression among all candidate genes in the coexpression network. Haplotype regression analysis revealed the association of 13 common significant haplotypes at Bonferroni ≤ 0.05. The phenotypic variance explained by these significant haplotypes ranged from low to moderate, suggesting a breeding strategy that combines multiple resistance alleles to enhance resistance to MLB. Additionally, one particular haplotype block (Hap_8.3) was found to consist of two SNPs (S8_152715134, S8_152460815) identified in GWAS with 9.45% variation explained (PVE)., Conclusion: The identified SNPs/ haplotypes associated with the trait of interest contribute to the enrichment of allelic diversity and hold direct applicability in Genomics Assisted Breeding for enhancing MLB resistance in maize., (© 2024. The Author(s).)
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- 2024
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14. Oxygen-enriched carbon quantum dots from coffee waste: Extremely active organic photocatalyst for sustainable solar-to-H 2 O 2 conversion.
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Lee DY, Haider Z, Krishnan SK, Kanagaraj T, Son SH, Jae J, Kim JR, Murphin Kumar PS, and Kim HI
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- Catalysis, Oxidation-Reduction, Photochemical Processes, Quantum Dots chemistry, Oxygen chemistry, Hydrogen Peroxide chemistry, Carbon chemistry, Sunlight, Coffee chemistry
- Abstract
Solar-driven artificial photosynthesis offers a promising avenue for hydrogen peroxide (H
2 O2 ) generation, an efficient and economical replacement for current methods. The efficiency and selectivity hurdles of the two-electron oxygen reduction reaction (ORR) in solar-to- H2 O2 conversion are substantial barriers to large scale production. In this manuscript, a simple biomass-assisted synthesis was performed to produce oxygen-enriched carbon quantum dots (OE-CQDs) from spent coffee waste, acting as an efficient photocatalyst for solar-powered H2 O2 production. OE-CQDs can stabilize and store light-generated electrons effectively, boosting charge separation and enhancing photocatalytic performance with longevity. The maximal photocatalytic H2 O2 production was achieved viz the utilization of OE-CQDs with generation rate of 356.86 μmol g-1 h-1 by retaining 80% activity without any external sacrificial donors. The outstanding performance of synthesized OE-CQDs under light exposure at wavelength (λ) of 280 nm has been ensured by the quantum yield value of 9.4% upon H2 O2 generation. The combinatorial benefits of OE-CQDs with their authentic crystalline structure and oxygen enrichment, is expected to be enhancing the ORR activity through accelerating charge transfer, and optimizing oxygen diffusion. Consequently, our eco-friendly method holds considerable promise for creating highly efficient, metal-free photocatalysts for artificial H2 O2 production., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Ltd. All rights reserved.)- Published
- 2024
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15. Auxiliary Partial Orthotopic Liver Transplantation Is a Safe and Effective Option for Yellow Phosphorus Toxin-induced Acute Liver Failure.
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Krishnan SK, Ramakrishna SH, Malleeswaran S, Kasala MB, Patcha R, Gopal P, Varghese J, Mouleeswaran KS, Appusamy E, and Reddy MS
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Background: Ingestion of yellow phosphorus-containing rodenticides (YPR) or firecrackers is an important cause of acute liver failure (ALF) in young adults and children, particularly in South and South-East Asia and South America. Emergency liver transplantation is indicated in cases refractory to intensive supportive therapy, including low-volume plasma exchange. There are no published reports on the feasibility of auxiliary partial orthotopic liver transplantation (APOLT) for YPR-induced ALF., Methods: Clinical details of patients undergoing APOLT for YPR-induced ALF in 1 unit are reported. Details of postoperative follow-up, native remnant regeneration, and immunosuppression withdrawal are also reported., Results: Between January 2021 and December 2023, 3 patients (4 y, 1.5 y, and 26 y) underwent emergency living donor liver transplantation for YPR-induced ALF. All patients were refractory to supportive therapies, including therapeutic plasma exchange, and demonstrated progression of liver injury in the form of severe encephalopathy needing intubation, ventilation, and organ support. APOLT was considered because of their young age and minimal intraoperative inotropic requirement. All explants showed confluent parenchymal necrosis with microvesicular and macrovesicular steatosis. Patients were initially maintained on standard immunosuppression. Good remnant regeneration was noted on follow-up imaging in all cases, enabling gradual withdrawal of immunosuppression. Currently, 1 child has been off immunosuppression for 15 mo and 2 others are on reduced doses of immunosuppression. All patients demonstrated good liver function., Conclusions: APOLT procedure can be an appropriate transplant option in YPR-related ALF for children and young adults without severe hemodynamic instability., Competing Interests: The authors declare no funding or conflicts of interest., (Copyright © 2024 Wolters Kluwer Health, Inc. All rights reserved.)
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- 2024
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16. Investigating the efficiency of electrocoagulation using similar/dissimilar electrodes for the detoxification of Coralene Rubine dye: a cost effective approach.
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David JJ, Stephen AMM, Kavitha S, Krishnan SK, Mariappan S, Sebastian SL, Palanichamy J, Kalivel P, and Sathishkumar P
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- Electrodes, Coloring Agents chemistry, Coloring Agents economics, Coloring Agents toxicity, Hydrogen-Ion Concentration, Spectrophotometry, Chromatography, High Pressure Liquid, Animals, Zebrafish, Titanium chemistry, Copper chemistry, Electrolysis methods
- Abstract
Efficient treatment of textile dyeing wastewater can be achieved through electrocoagulation (EC) with minimal sludge production; however, the selection of the appropriate electrode is essential in lowering overall costs. Also, the reuse of the treated aqueous azo dye solution from this process has not been explored in detail. With these objectives, this study aims to treat synthetic azo dye solutions and achieve high colour removal efficiency (CRE%) using similar (Ti-Ti) and dissimilar (Ti-Cu) metal electrodes through EC with an attempt to reduce the cost. The aqueous Coralene Rubine GFL azo dye was used to examine the efficiency and cost of the EC process. X-Ray Photoelectron Spectroscopy was used to study the EC mechanism, while High Performance Liquid Chromatography was used to analyse the degradation of the dye and the formation of intermediate compounds. The concentration of metal ions in the treated dye solution was quantified using Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES), with Ti-Ti treated solution having 14.20 mg/L concentration of Ti and Ti-Cu treated solution having 0.078 mg/L of Ti and 0.001 mg/L of Cu, respectively. Colour removal efficiency of 99.49% was obtained for both electrode sets, with a lower operating time and voltage for dissimilar metal combination. Ecotoxicity studies showed negligible toxicity of Ti-Cu treated dye samples compared to untreated solutions. Survival rate, protein estimation, and catalase activity was used to validate the treatment method's efficacy. The study found that the dissimilar electrode material exhibited reduced toxicity due to the presence of heavy metals below the permissible limit., (© 2024. The Author(s), under exclusive licence to Springer Nature B.V.)
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- 2024
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17. Outcomes of the Electrothermal Bipolar Vessel Sealing Device and Electrocautery in Modified Radical Mastectomy Patients.
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Chirukandath R, Fernandez SR, Krishnan SK, Sulaiman SV, Suting D, P SG, and Nair SR
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Introduction With the rising trends in breast cancer throughout the world, the traditional modus of intraoperative tissue dissection using a scalpel, scissors, or electrocautery needs to be re-evaluated in the wake of newer modalities, such as electrothermal bipolar vessel sealing (EBVS) devices, which may theoretically reduce the postoperative complications and morbidity in these patients. Aim and objective The objective of this study is to compare an EBVS device to electrocautery (diathermy) in modified radical mastectomy (MRM), based on selected intraoperative and postoperative outcomes. Study procedure This was a comparative cross-sectional section study that included 60 patients with operable breast cancer (stages I and II, TNM classification, and post-neoadjuvant stage III disease). Patients were divided into two groups for surgery: one group underwent an MRM using the EBVS device (Group A), while the other group had the procedure performed using conventional electrocautery (Group B), as per the surgeon's choice depending on theatre slot and equipment availability. Intraoperatively, the total operative time, time for raising the flaps, time taken for breast tissue dissection, time for axillary dissection, and blood loss were recorded. Postoperative parameters included total drainage volume, number of days of drainage, seroma formation, and other complications. Patients were followed up for one month after surgery, with early postoperative complications such as wound infection, upper limb lymphedema, seroma, flap necrosis, and nerve injuries being documented. Results The groups were found to be comparable in terms of the age distribution, TNM staging, stage grouping, and nodal status of the patients. The EBVS device group demonstrated statistically significant advantages in total operative time, axillary dissection time, flap raising time, breast tissue dissection time, intraoperative blood loss, total drainage volume, and days of drainage. However, no statistically significant difference was found between the two devices in terms of seroma formation, early postoperative complications, and duration of postoperative stay at the hospital. Conclusion While the use of EBVS in MRM provides a considerable decrement in the total operative duration, duration of the various steps of surgery, intraoperative blood loss, and postoperative volume and duration of drainage, these devices do not offer an evident advantage in terms of the postoperative complications or morbidity., Competing Interests: Human subjects: Consent was obtained or waived by all participants in this study. Institutional Ethical Committee, Government Medical College, Thrissur, Thrissur, India issued approval IEC/GMCTCR/2020/042. Animal subjects: All authors have confirmed that this study did not involve animal subjects or tissue. Conflicts of interest: In compliance with the ICMJE uniform disclosure form, all authors declare the following: Payment/services info: All authors have declared that no financial support was received from any organization for the submitted work. Financial relationships: All authors have declared that they have no financial relationships at present or within the previous three years with any organizations that might have an interest in the submitted work. Other relationships: All authors have declared that there are no other relationships or activities that could appear to have influenced the submitted work., (Copyright © 2024, Chirukandath et al.)
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- 2024
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18. Effects of seasons and successive upwelling phases on phytoplankton size classes in the Southeast Arabian Sea.
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K J A, R J, K T A, S SK, C K S, and G V M G
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- Indian Ocean, Seawater chemistry, Biomass, India, Chlorophyll A analysis, Phytoplankton physiology, Seasons, Environmental Monitoring
- Abstract
The responses of Phytoplankton Size Classes (PSCs) to seasons and the distinct phases of coastal upwelling in the northern Indian Ocean is an understudied aspect. This study introduces observations from a monthly time series conducted at three cross-shore transects in the south, central, and north regions between 6 and 13°N along the southwest coast of India in the Southeastern Arabian Sea (SEAS). The data represent pre-upwelling (late April to early May), early upwelling (early to mid-June), peak upwelling (early to mid-August), late upwelling (mid to late September), and post-upwelling (late October to early November) phases. The pre-upwelling had a stratified and nitrate-depleted upper euphotic column due to the intrusion of low saline Bay of Bengal water and solar heating which resulted in a low phytoplankton biomass (chlorophyll-a) contributed by pico-PSC (av. 56.21 ± 21.23 %) followed by nano-PSC (25.25 ± 5.98 %). During the early upwelling, a dominant micro-PSC was prevalent in the coastal stations in the south transect due to the initiation of upwelling there. The peak upwelling was characterised by significant nutrient enrichment causing the dominance of larger micro- and meso-PSCs in the entire coastal region (av. 79.13 ± 39.68 %). Since the late upwelling had less nutrient enrichment, the contribution of nano- and pico-PSCs increased along the south and central transects. By the post-upwelling phase, the dominance of nano-PSC (av. 57.85 ± 11.02 %) and pico-PSC (av. 21.19 ± 11.72 %) was reestablished in the study area due to the end of the nutrient enrichment of upwelling. The subsurface chlorophyll maxima, which was found below 50 m during the pre-upwelling phase, had altered into a thick layer (30 m) and shifted to the upper water column during the upwelling phases when nutrients were higher and solar radiation was lower in the surface waters. A sequential transition of PSCs from pre-upwelling to post-upwelling was evident and it appears that the very high supply of nutrients NO
3 and SiO4 (>5 μM) during different phases of upwelling favoured the dominance of larger PSCs., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Ltd. All rights reserved.)- Published
- 2024
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19. Ionic Liquid-Assisted Thermal Evaporation of Bimetallic Ag-Au Nanoparticle Films as a Highly Reproducible SERS Substrate for Sensitive Nanoplastic Detection in Complex Environments.
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Carreón RV, Cortázar-Martínez O, Rodríguez-Hernández AG, Serrano de la Rosa LE, Gervacio-Arciniega JJ, and Krishnan SK
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Nanoplastic particles are emerging as an important class of environmental pollutants in the atmosphere that have adverse effects on our ecosystems and human health. While many methods have been developed to quantitatively detect nanoplastics; however, sensitive detection at low concentrations in a complex environment remains elusive. Herein, we demonstrate a greener method to fabricate a surface-enhanced Raman spectroscopy (SERS) substrate consisting of self-assembled plasmonic Ag-Au bimetallic nanoparticle (NP) films for quantitative SERS detection of nanoplastics in complex media. The self-assembly of Ag-Au bimetallic NPs was achieved through thermal evaporation onto a vapor-phase compatible ionic liquid based on deep eutectic solvent over the growth substrate. The finite-difference time-domain simulation revealed that the localized field enhancement is strong in the gaps, which generate uniform SERS "hotspots" in the obtained substrate. Benefiting from highly accessible SERS "hotspots" at the gaps, the SERS substrate exhibits excellent sensitivity for detecting crystal violet with a limit of detection (LOD) as low as 10
-14 M and excellent reproducibility (RSD of 5.8%). The SERS substrate is capable of detecting PET nanoplastics with LOD as low as 1 μg/mL and about 100 μg/mL in real samples such as tap water, lake water, diluted milk, and wine. Moreover, we also validated the feasibility of the designed SERS substrate for the practical detection of PET nanoplastics collected from commercial drinking water bottles, and it showed great potential applications for sensitive detection in actual environments.- Published
- 2024
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20. Unraveling the Enigma: A Five-Year Comprehensive Analysis of Hurthle Cell Tumors in South India's Tertiary Care Center.
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Sulaiman S, Chirukandath R, Krishnan SK, Rajesh N, Antony M, Mohan K, and S S
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Background: Hurthle cell tumors of the thyroid gland constitute a rare and enigmatic group of neoplasms, characterized by the presence of Hurthle cells exhibiting abundant eosinophilic cytoplasm and numerous mitochondria. Despite their low incidence, they pose diagnostic challenges and display diverse clinical outcomes. This study aims to provide a comprehensive analysis of the clinicopathological profile of Hurthle cell tumors within a tertiary care center in South India., Methods: Through a retrospective approach, we analyzed cases of Hurthle cell tumors diagnosed and treated at a tertiary care center over a five-year period. Clinical, radiological, and histopathological data were meticulously collected and scrutinized. The study focused on examining demographic details, presenting symptoms, imaging features, cytological findings, surgical management, and postoperative outcomes of the patients., Results: A total of 32 cases of Hurthle cell tumors were identified during the study period. The majority of patients were female (84%), with a mean age of 49.6 years for Hurthle cell carcinoma. Thyroid enlargement and neck mass were the most common presenting complaints. Fine-needle aspiration cytology showed characteristic features suggestive of Hurthle cell tumors in 33% of cases. Total thyroidectomy remains the mainstay surgical approach. Histopathological evaluation confirmed 62.5% of cases as benign adenomas and 37.5% as malignant carcinomas. Among malignant cases, 67% showed capsular invasion and 33% demonstrated vascular invasion. Of the patients, 33.3% received adjuvant radiotherapy. The overall survival rate was 100%. In our study, we found that thyroid nodules larger than 3 cm demonstrated a higher propensity for Hurthle cell carcinoma., Conclusion: Our findings support the multidisciplinary approach in managing Hurthle cell tumors, with a focus on tailored treatment plans for each patient based on individual characteristics. By recognizing the female predominance, assessing nodule size, and employing a combination of thyroidectomy and ablative therapy, clinicians can optimize patient care and contribute to better long-term prognosis and quality of life for those affected by Hurthle cell tumors. Continued research and collaborative efforts are necessary to advance our understanding and refine treatment strategies, paving the way for improved outcomes and enhanced patient management in the future., Competing Interests: The authors have declared that no competing interests exist., (Copyright © 2024, Sulaiman et al.)
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- 2024
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21. Synergistic Interaction between Ruthenium Catalysts and Grafted Niobium on SBA-15 for 2,5-Furandicarboxylic Acid Production Using 5-Hydroxymethylfurfural.
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Perumal SK, Lee S, Yu H, Heo J, Kang MJ, Kim Y, Park M, Lee H, and Kim HS
- Abstract
This study entailed the synthesis of Ru nanocatalyst decorated on Nb-grafted SBA-15. A Nb-grafted SBA-15 support with varying Nb contents was utilized as a support for the Ru nanoparticles. The effect of Nb grafting on the immobilized Ru nanoparticle catalyst was systematically investigated, and its catalytic performance in the synthesis of furandicarboxylic acid using 5-hydroxymethylfurfural under base-free reaction conditions was evaluated. The results indicate the increased productivity of the Ru@Nb-grafted SBA-15 catalyst with a yield exceeding 95%, representing a significant advancement in catalysis. This study also affords insights into the complex relationship between the catalytic activity and selectivity and its unique surface attributes. Moreover, acidic sites were created, and the electron density within the active sites was modulated by monomeric Nb oxide species on the SBA-15. Additionally, the role of high-electron-density Ru atoms in facilitating the efficient adsorption and activation of the reactant, resulting in enhanced catalytic efficacy, was highlighted.
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- 2024
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22. Photovoltaic-wind-battery and diesel generator-based hybrid energy system for residential buildings in smart city Coimbatore.
- Author
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Thirumalai SK, Karthick A, Dhal PK, and Pundir S
- Subjects
- India, Computer Simulation, Electric Power Supplies, Wind, Sunlight
- Abstract
The building consumes almost 40% of the energy generated in the building. Investigating the photovoltaic system, wind, battery, and diesel generators for residential buildings can reduce energy utilization. In this work, various energy sources are combined to form hybrid energy sources, which are designed based on the load of the residential building. The Hybrid Optimization of Multiple Energy Resources tool optimizes various energy sources such as photovoltaic (PV), wind, diesel generator (DG), and battery. An investigation on the residential load in the smart city of Coimbatore, Tamil Nadu, India, is being carried out. This article examined the technological and economic feasibility of solar photovoltaic, wind, diesel generators, and batteries combined to form a hybrid energy source (HES). With 2 kW of photovoltaic, 1 kW wind, 1 kW of DG, 1 kW of the power converter, and five batteries, system case 1 (photovoltaic/wind/diesel generator/battery model) had the best results in the simulation and was recommended for use in the proposed residential building. As a result, it has a minimum net present value of $14,568 and an energy cost of $0.312/kWh, which is about 39% cheaper than system base cases. The sensitivity and environmental analysis are carried out to analyze the system's feasibility., (© 2024. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
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- 2024
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23. A sustainable and eco-friendly approach for environmental and energy management using biopolymers chitosan, lignin and cellulose - A review.
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Christina K, Subbiah K, Arulraj P, Krishnan SK, and Sathishkumar P
- Subjects
- Lignin chemistry, Biopolymers chemistry, Polymers chemistry, Cellulose chemistry, Chitosan chemistry
- Abstract
Biopolymers are a naturally occurring alternative to synthetic polymers that are linked by covalent bonds, which includes cellular components such as proteins, nucleotides, lipids, and polysaccharides. Based on the extensive literature review it was found that chitosan, lignin, and cellulose were predominantly used in the energy and environmental sectors. Due to their vast array of qualities, including the adsorption, flocculation, anticoagulation, and furthermore, have made them useful for treating wastewater and pollutant removal. Chitosan and lignin have been used as a proton exchange membrane in the energy storage device of fuel cells. As these biopolymers develop strong coordination connections with metal surfaces, they act as an anticorrosive agent, which inhibiting the corrosion. Besides, there are a lot of recent developments in the application of biopolymers for energy and environmental fields. The present review provides a concise summary of recent developments in membrane-based biopolymers role in energy and environmental field. In addition, this review is drawn to a conclusion with a discussion of future trends in the real application of biopolymers in a variety of different industries, as well as the financial significance of these future trends., 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
- 2024
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24. Hidden Intruder: A Rare Encounter of Dirofilaria Masquerading as a Breast Lump.
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Sulaiman SV, Chirukandath R, Krishnan SK, Subramanian RM, and Salim Aysha S
- Abstract
Dirofilaria , commonly known as heartworm, is a parasitic nematode that primarily infects canines. However, human infections have been reported and can present as subcutaneous nodules in different parts of the body. We present a case of a 43-year-old female who presented with a breast lump that was ultimately diagnosed as a Dirofilaria infection, a rare occurrence in humans. This case report shows that considering parasites in unusual presentations is of utmost importance, especially in regions known to have a high prevalence of such infections., Competing Interests: The authors have declared that no competing interests exist., (Copyright © 2023, Sulaiman et al.)
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- 2023
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25. Oblique direction reach test: evaluating psychometric properties in stroke population.
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Mascarenhas R, Nayak A, Joshua AM, Krishnan SK, Iyer VLR, Tedla JS, and Reddy RS
- Subjects
- Humans, Adolescent, Young Adult, Adult, Middle Aged, Aged, Aged, 80 and over, Psychometrics, Reproducibility of Results, Physical Therapy Modalities, Postural Balance, Stroke diagnosis
- Abstract
Background: Post-stroke individuals are observed to have reduced limits of stability (LOS) in all directions. Functional activities are rarely performed in pure cardinal planes; instead, they are most likely to be performed in an oblique direction. Existing tools are either expensive or sophisticated to assess the LOS in an oblique direction. Therefore, this study's primary objective is to evaluate the intra-rater, inter-rater reliability, and validity of the oblique direction reach test (ODRT) among stroke subjects., Materials & Methods: A total of 96 first-time stroke patients with age, gender, height, and weight-matched healthy controls aged 18-80 years were recruited for the study. Oblique, forward, and lateral reach distances were assessed using the standard procedure of ODRT, Functional Reach Test (FRT), and Lateral Reach Test (LRT), respectively. Validity was tested by correlating the ODRT distance with the Berg Balance Scale (BBS) Score using Spearman's rank correlation coefficient. Intraclass correlation coefficients (ICCs) and Bland Altman analysis were used to establish inter-rater reliability. ICCs were used to find intra-rater reliability. The Mann-Whitney U test was used to establish the mean difference of the FRT, LRT, and ODRT. Spearman's rank correlation coefficient and linear regression were used to correlate the distance of FRT and LRT with ODRT., Results: A high concurrent validity was found between BBS and ODRT with an r -value of 0.905 ( p < 0.001). Inter-rater reliability was high with an ICC of 0.997 (95% CI [0.996-0.998]), and intra-rater reliability was highly significant with an ICC of 0.996 (95% CI [0.994-0.998]). The stroke subjects reached a significantly shorter distance than healthy individuals in FRT, ODRT, and LRT. ODRT was highly correlated with FRT ( r = 0.985) and LRT ( r = 0.978) ( p < 0.001) and had an R
2 = 0.987., Conclusion: ODRT is a highly valid and reliable tool that can be used to evaluate balance in stroke patients. Individuals who reached less in the forward and lateral directions showed reduced reach distance in the oblique direction., Competing Interests: The authors declare that they have no competing interests., (© 2023 Mascarenhas et al.)- Published
- 2023
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26. Bilirubin in wound healing: A double-edged sword.
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Singla K, M P SK, Bhattacharjya A, Saxena R, Choudhary N, and Goyal B
- Subjects
- Reactive Oxygen Species metabolism, Bilirubin, Wound Healing
- Abstract
The impact of bilirubin levels on wound healing remains a topic of controversy. The present study is a literature review that examines the impact of increased levels of bilirubin in the bloodstream on the process of wound healing. The physiological pathways and their interrelationships, as well as the relevant research publications, were comprehensively addressed in our discussion. The present study undertook a comprehensive review of the extant literature pertaining to the impact of bilirubin concentration on the process of wound healing, with particular emphasis on its association with reactive oxygen species. This scholarly article provides an overview of several studies that elucidate the mechanisms and correlation between bilirubin and the process of wound healing. The impact of bilirubin on wound healing has been observed, and it appears to function as a modulator. This review demonstrates that there exists a spectrum of bilirubin concentrations that can function as precise regulators, although this range falls under pathological hyperbilirubinemia. Further research is required to determine the precise boundary of this range. Within a certain range, bilirubin serves as a positive regulator in the process of wound healing. Beyond this range, it has the potential to function as a negative regulator., (© 2023 John Wiley & Sons Ltd.)
- Published
- 2023
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27. The Administration of Levodopa in a Patient With Parkinson's Disease Using a Novel Maxillofacial Route: A First-in-Human Report.
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Thirunavukarasu S, Ramanan BBV, Suresh SK, Antonisamy VJ, Varadharaj D, Shanmugam P, Verma K, Elumalai C, Selvakumar G, Elumalai A, Prabahar L, Janardhanan HA, and Ur A
- Abstract
Parkinson's disease is characterized by the loss of nigrostriatal dopaminergic neurons in the brain. Dopamine cannot be administered systemically because it does not cross the blood-brain barrier. Oral levodopa remains the gold standard to date. Currently, for patients who show a poor response to oral levodopa and for those who cannot take it orally, the alternate routes available are inhalation and continuous administration via intestinal and subcutaneous routes. In this report, a novel maxillofacial route was used for the first time in the world to administer levodopa to a Parkinson's patient. Furthermore, the efficacy of maxillofacial administration was compared with the oral route of administration., Competing Interests: The authors Anoop UR and Kavita Verma are identified as the inventors of the drug delivery system and the method of drug delivery. They are listed as applicants in the granted patents AU2016300184; US11,207,461B2; IN413914; and IN360982, as well as in the patent application PCT/IB2016/053899 with National Phase Entry into India, the European Patent Office, and Canada., (Copyright © 2023, Thirunavukarasu et al.)
- Published
- 2023
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28. Detection of Sensor Faults with or without Disturbance Using Analytical Redundancy Methods: An Application to Orifice Flowmeter.
- Author
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Sravani V and Venkata SK
- Abstract
Sensors and transducers play a vital role in the productivity of any industry. A sensor that is frequently used in industries to monitor flow is an orifice flowmeter. In certain instances, faults can occur in the flowmeter, hindering the operation of other dependent systems. Hence, the present study determines the occurrence of faults in the flowmeter with a model-based approach. To do this, the model of the system is developed from the transient data obtained from computational fluid dynamics. This second-order transfer function is further used for the development of linear-parameter-varying observers, which generates the residue for fault detection. With or without disturbance, the suggested method is capable of effectively isolating drift, open-circuit, and short-circuit defects in the orifice flowmeter. The outcomes of the LPV observer are compared with those of a neural network. The open- and short-circuit faults are traced within 1 s, whereas the minimum time duration for the detection of a drift fault is 5.2 s and the maximum time is 20 s for different combinations of threshold and slope.
- Published
- 2023
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29. The safety, health, and well-being of healthcare workers during COVID-19: A scoping review.
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Nashwan AJ, Mathew RG, Anil R, Allobaney NF, Nair SK, Mohamed AS, Abujaber AA, Balouchi A, and Fradelos EC
- Abstract
The outbreak of the COVID-19 pandemic has affected the safety and well-being of healthcare workers. A scoping review was conducted to highlight the impact of COVID-19 on the safety, health, and well-being of healthcare workers and to shed light on the concerns about their perceived safety and support systems. A literature search was conducted in three different databases from December 1, 2019, through July 20, 2022, to find publications that meet the aim of this review. Using search engines, 3087 articles were identified, and after a rigorous assessment by two reviewers, 30 articles were chosen for further analysis. Two themes emerged during the analysis: safety and health and well-being. The primary safety concern of the staff was mostly about contracting COVID-19, infecting family members, and caring for patients with COVID-19. During the pandemic, the health care workers appeared to have anxiety, stress, uncertainty, burnout, and a lack of sleep. Additionally, the review focused on the suggestions of health care providers to improve the safety and well-being of workers through fair organizational policies and practices and timely, individualized mental health care., Competing Interests: Conflict of interest: Evangelos C. Fradelos is an editorial board member for AIMS Public Health and was not involved in the editorial review or the decision to publish this article All authors declare that there are no competing interests., (© 2023 the Author(s), licensee AIMS Press.)
- Published
- 2023
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30. Novel radiological technique to recognize acute liver failure caused by yellow phosphorous containing rodenticides.
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Gopal P, Krishnan SK, Malleswaran S, Srinivas S, Mouleeswaran S, Patcha R, Varghese J, and Reddy MS
- Subjects
- Humans, Female, ROC Curve, Rodenticides, Liver Failure, Acute chemically induced, Liver Failure, Acute diagnostic imaging, Liver Transplantation adverse effects
- Abstract
Yellow phosphorous rodenticide (YPR) poisoning is the commonest cause for acute liver failure (ALF) in southern and western India. Due to medicolegal issues, history of YPR ingestion may not be available. As early recognition of YPR poisoning is important and there are no specific biochemical assays, other early predictors to identify this entity is necessary. We evaluated the diagnostic role of plain computed tomography (CT) in identifying YPR-induced ALF. All patients admitted to the liver unit with a diagnosis of ALF underwent a plain CT scan abdomen. Demographic details, clinical history, laboratory parameters, liver attenuation index (LAI) calculated on CT scan, treatment details, need for liver transplantation and clinical outcome were analyzed. Parameters for YPR-induced ALF (ALF-YPR) and other causes (ALF-OTH) were compared. Ability of LAI to distinguish ALF-YPR and ALF-OTH was analyzed using receiver operating characteristic (ROC) curve analysis. Twenty-four patients (15 female [62.5%]) were included in the study. Thirteen patients (54%) had YPR poisoning, while the rest formed the ALF-OTH group (11,46%). ALF-YPR patients had higher transaminase levels, lower peak serum bilirubin levels. ALF-YPR livers had significantly lower LAI as compared to ALF-OTH (- 30 vs. - 8, p = 0.001). On ROC curve analysis, an LAI greater than - 18 ruled out YPR as the cause for ALF with 91% sensitivity and 85% specificity. On regression analysis, LAI was the only independent factor predicting ALF-YPR (odds ratio - 0.86, [0.76, 0.96] p = 0.008). Our data shows that LAI on plain abdominal CT scan can be used to quickly recognize ALF-YPR in unclear cases so that necessary treatment protocol can be activated, or patient transfer arranged. Our analysis shows that an LAI greater than - 18 can reliably rule out YPR ingestion as the cause for ALF., (© 2023. Indian Society of Gastroenterology.)
- Published
- 2023
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31. Squamous Cell Carcinoma Scalp With Intracranial Extension: Challenging Case of Multidisciplinary Care.
- Author
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Chirukandath R, Krishnan SK, Sulaiman SV, Kollannur LK, and Nishthar Cmt M
- Abstract
Squamous cell carcinoma (SCC) of the scalp is the second most common non-melanoma cancer of the skin. The incidence of squamous cell carcinoma on the scalp is on the rise, but the intracranial extension is rare. Cranial invasion is rare in SCC of the scalp, but when present, it is associated with a poor prognosis. A 62-year-old female presented with complaints of swelling over the back of her scalp for three months, which rapidly increased in size. She also had a throbbing headache, alopecia in that area, and multiple episodes of pustules in that area. On examination, she had an ulceroproliferative lesion measuring 5*5*3 cm with an irregular surface and varying consistency over the occipital area in the midline surrounded by ulcerations and crusted discharge and fixed to the bone. Contrast-enhanced magnetic resonance imaging (MRI) showed an irregular lesion with the destruction of the right parietal and occipital bones involving both inner and outer tables with intracranial and extracranial components, and the lesion was abutting the superior sagittal sinus. The treatment is surgical resection of the tumor with margin clearance. The treatment plan was designed using a multidisciplinary approach with the collaboration of oncosurgery, neurosurgery, and plastic surgery. The patient underwent wide local excision of the tumor with adequate skin and cranial bone clearance. The tumor was found to have infiltrated the dura mater overlying the superior sagittal sinus. The defect was then closed using a vault prosthetic cover and a scalp transposition flap from the left parietal area. This case report intends to highlight the need for a multidisciplinary approach to the proper management of advanced squamous cell carcinoma to decrease the morbidity and mortality in patients., Competing Interests: The authors have declared that no competing interests exist., (Copyright © 2023, Chirukandath et al.)
- Published
- 2023
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32. Graphene-Based Field-Effect Transistors in Biosensing and Neural Interfacing Applications: Recent Advances and Prospects.
- Author
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Krishnan SK, Nataraj N, Meyyappan M, and Pal U
- Subjects
- Software, Transistors, Electronic, Graphite, Biosensing Techniques
- Published
- 2023
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33. Plasmon Effect of Ag Nanoparticles on TiO 2 /rGO Nanostructures for Enhanced Energy Harvesting and Environmental Remediation.
- Author
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Athithya S, Manikandan VS, Harish SK, Silambarasan K, Gopalakrishnan S, Ikeda H, Navaneethan M, and Archana J
- Abstract
We report Ag nanoparticles infused with mesosphere TiO
2 /reduced graphene oxide (rGO) nanosheet (TiO2 /rGO/Ag) hybrid nanostructures have been successfully fabricated using a series of solution process synthesis routes and an in-situ growth method. The prepared hybrid nanostructure is utilized for the fabrication of photovoltaic cells and the photocatalytic degradation of pollutants. The photovoltaic characteristics of a dye-sensitized solar cell (DSSC) device with plasmonic hybrid nanostructure (TiO2 /rGO/Ag) photoanode achieved a highest short-circuit current density ( JSC ) of 16.05 mA/cm2 , an open circuit voltage ( VOC ) of 0.74 V and a fill factor ( FF ) of 62.5%. The fabricated plasmonic DSSC device exhibited a maximum power conversion efficiency (PCE) of 7.27%, which is almost 1.7 times higher than the TiO2 -based DSSC (4.10%). For the photocatalytic degradation of pollutants, the prepared TiO2 /rGO/Ag photocatalyst exhibited superior photodegradation of methylene blue (MB) dye molecules at around 93% and the mineralization of total organic compounds (TOC) by 80% in aqueous solution after 160 min under continuous irradiation with natural sunlight. Moreover, the enhanced performance of the DSSC device and the MB dye degradation exhibited by the hybrid nanostructures are more associated with their high surface area. Therefore, the proposed plasmonic hybrid nanostructure system is a further development for photovoltaics and environmental remediation applications.- Published
- 2022
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34. Identification and validation of a key genomic region on chromosome 6 for resistance to Fusarium stalk rot in tropical maize.
- Author
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Rashid Z, Babu V, Sharma SS, Singh PK, and Nair SK
- Subjects
- Humans, Zea mays genetics, Disease Resistance genetics, Genome-Wide Association Study, Chromosomes, Human, Pair 6, Plant Diseases genetics, Plant Breeding, Polymorphism, Single Nucleotide, Fusarium
- Abstract
Key Message: A key genomic region was identified for resistance to FSR at 168 Mb on chromosome 6 in GWAS and haplotype regression analysis, which was validated by QTL mapping in two populations. Fusarium stalk rot (FSR) of maize is an economically important post-flowering stalk rot (PFSR) disease caused by Fusarium verticillioides. The pathogen invades the plant individually, or in combination with other stalk rot pathogens or secondary colonizers, thereby making it difficult to make accurate selection for resistance. For identification and validation of genomic regions associated with FSR resistance, a genome-wide association study (GWAS) was conducted with 342 maize lines. The panel was screened for FSR in three environments using standard artificial inoculation methodology. GWAS using the mixed linear model corrected for population structure and kinship was done, in which 290,626 SNPs from genotyping-by-sequencing were used. A total of 7 SNPs, five on chromosome 6 showing strong LD at 168 Mb, were identified to be associated with FSR. Haplotype regression analysis identified 32 haplotypes with a significant effect on the trait. In a QTL mapping experiment in two populations for validating the identified variants, QTLs were identified with confidence intervals having overlapped physical coordinates in both the populations on chromosome 6, which was closely located to the GWAS-identified variants on chromosome 6. It makes this genomic region a crucial one to further investigate the possibility of developing trait markers for deployment in breeding pipelines. It was noted that previously reported QTLs for other stalk rots in maize mapped within the same physical intervals of several haplotypes identified for FSR resistance in this study. The possibility of QTLs controlling broad-spectrum resistance for PFSR in general requires further investigation., (© 2022. The Author(s).)
- Published
- 2022
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35. An Unusual Stomach Tumour: Plexiform Angiomyxoid Fibroma Stomach-A Case Report.
- Author
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Krishnan SK, Chirukandath R, Zachariah T, and Thomas RS
- Abstract
Plexiform angiomyxoid myofibroblast tumour (PAMT) is a rare mesenchymal tumour of the stomach. To date, about 45 cases of PAMT have been reported in the literature. This is an extremely rare mesenchymal gastric tumour with definite histological pattern and is a tumour typified by spindle cells with myofibroblast characteristics. A 70-year-old woman was admitted with vague upper abdominal pain and dyspepsia and on OGD was found to have a polypoidal lesion with ulceration on the posterior wall of the body of the stomach towards the greater curvature. The endoscopy biopsy suggested the above diagnosis. The patient was investigated with CT scan and CT showed a large nodular growth 10 × 8 cm with pancreatic tail involvement and splenic involvement. The patient was treated with multi-visceral resection and favourable outcome was achieved. This entity of PAMT was a histological rarity and a technically challenging case and hence was analysed and presented. PAMT is a rare mesenchymal tumour of the stomach and is characterised by spindle cells with myofibroblast characteristics with a potential to differentiate towards smooth muscle cells. These tumours have a benign course and rarely can have an infiltrative behaviour. PAMT of the stomach is a very rare mesenchymal tumour with a unique histological appearance, and it needs to be distinguished from GIST and other gastrointestinal mesenchymal tumours, although extra gastric extension and vascular invasion are sometimes observed. Here, we are reporting this case as a case of PAMT arising from the body of the stomach which required multi-visceral resection., Competing Interests: Conflict of InterestThe authors declare no competing interests., (© The Author(s), under exclusive licence to Indian Association of Surgical Oncology 2022, Springer Nature or its licensor 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.)
- Published
- 2022
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36. Supramolecular bioamphiphile facilitated bioemulsification and concomitant treatment of recalcitrant hydrocarbons in petroleum refining industry oily waste.
- Author
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Venkatesan SK, Uddin M, Rajasekaran M, Ramani Kandasamy, and Ganesan S
- Subjects
- Amino Acids, Biodegradation, Environmental, Hydrocarbons metabolism, Industrial Waste, Sewage, Spectroscopy, Fourier Transform Infrared, Petroleum analysis
- Abstract
Bioremediation of real-time petroleum refining industry oily waste (PRIOW) is a major challenge due to the poor emulsification potential and oil sludge disintegration efficiency of conventional bioamphiphile molecules. The present study was focused on the design of a covalently engineered supramolecular bioamphiphile complex (SUBC) rich in hydrophobic amino acids for proficient emulsification of hydrocarbons followed by the concomitant degradation of total petroleum hydrocarbons (TPH) in PRIOW using the hydrocarbonoclastic microbial bio-formulation system. The synthesis of SUBC was carried out by pH regulated microbial biosynthesis process and the yield was obtained to be 450.8 mg/g of petroleum oil sludge. The FT-IR and XPS analyses of SUBC revealed the anchoring of hydrophilic moieties of monomeric bioamphiphilic molecules, resulting in the formation of SUBC via covalent interaction. The SUBC was found to be lipoprotein in nature. The maximum loading capacity of SUBC onto surface modified rice hull (SMRH) was achieved to be 45.25 mg/g SMRH at the optimized conditions using RSM-CCD design. The SUBC anchored SMRH was confirmed using SEM, FT-IR, XRD and TGA analyses. The adsorption isotherm models of SUBC onto SMRH were performed. The integrated approach of SUBC-SMRH and hydrocarbonoclastic microbial bio-formulation system, emulsified oil from PRIOW by 92.86 ± 2.26% within 24 h and degraded TPH by 89.25 ± 1.75% within 4 days at the optimum dosage ratio of SUBC-SMRH (0.25 g): PRIOW (1 g): mass of microbial-assisted biocarrier material (0.05 g). The TPH degradation was confirmed by SARA fractional analysis, FT-IR,
1 H NMR and GC-MS analyses. The study suggested that the application of covalently engineered SUBC has resulted in the accelerated degradation of real-time PRIOW in a very short duration without any secondary sludge generation. Thus, the SUBC integrated approach can be considered to effectively manage the hydrocarbon contaminants from petroleum refining industries under optimal conditions., 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 © 2022 Elsevier Ltd. All rights reserved.)- Published
- 2022
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37. Right Lobe Living Donor Hepatectomy in the Setting of Agenesis of Gall Bladder - A Case Report.
- Author
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Gopal P, Patcha R, Nikkhil J, Krishnan SK, Malleswaran S, Varghese J, and Reddy MS
- Abstract
Agenesis of Gall Bladder (AGB) is a rare congenital anomaly with only around 500 cases reported so far. The condition may be associated with other biliary anomalies and present diagnostic and technical challenges during hemi hepatectomy which can be surmounted with careful planning. Live donor hepatectomy in the setting of AGB has not been reported before. We report a case of AGB in a potential living donor and highlight the technical modifications used to perform a safe right hepatectomy in this donor., (© 2022 Indian National Association for Study of the Liver. Published by Elsevier B.V. All rights reserved.)
- Published
- 2022
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38. Selective Translocation of Cyclic Sugars through Dynamic Bacterial Transporter.
- Author
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Vikraman D, Satheesan R, Rajendran M, Kumar NA, Johnson JB, R SK, and Mahendran KR
- Subjects
- Biological Transport, Kinetics, Nanopores, Sugars
- Abstract
The selective translocation of molecules through membrane pores is an integral process in cells. We present a bacterial sugar transporter, CymA of unusual structural conformation due to a dynamic N terminus segment in the pore, reducing its diameter. We quantified the translocation kinetics of various cyclic sugars of different charge, size, and symmetry across native and truncated CymA devoid of the N terminus using single-channel recordings. The chemically divergent cyclic hexasaccharides bind to the native and truncated pore with high affinity and translocate effectively. Specifically, these sugars bind and translocate rapidly through truncated CymA compared to native CymA. In contrast, larger cyclic heptasaccharides and octasaccharides do not translocate but bind to native and truncated CymA with distinct binding kinetics highlighting the importance of molecular charge, size and symmetry in translocation consistent with liposome assays. Based on the sugar-binding kinetics, we suggest that the N terminus most likely resides inside the native CymA barrel, regulating the transport rate of cyclic sugars. Finally, we present native CymA as a large nanopore sensor for the simultaneous single-molecule detection of various sugars at high resolution, establishing its functional versatility. This natural pore is expected to have several applications in nanobiotechnology and will help further our understanding of the fundamental mechanism of molecular transport.
- Published
- 2022
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39. Immunoinformatics Aided Design and In-Vivo Validation of a Cross-Reactive Peptide Based Multi-Epitope Vaccine Targeting Multiple Serotypes of Dengue Virus.
- Author
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Kaushik V, G SK, Gupta LR, Kalra U, Shaikh AR, Cavallo L, and Chawla M
- Subjects
- Animals, Epitopes, Humans, Molecular Docking Simulation, Peptides, Rabbits, Serogroup, Dengue Virus, Vaccines
- Abstract
Dengue virus (DENV) is an arboviral disease affecting more than 400 million people annually. Only a single vaccine formulation is available commercially and many others are still under clinical trials. Despite all the efforts in vaccine designing, the improvement in vaccine formulation against DENV is very much needed. In this study, we used a roboust immunoinformatics approach, targeting all the four serotypes of DENV to design a multi-epitope vaccine. A total of 13501 MHC II binding CD4+ epitope peptides were predicted from polyprotein sequences of four dengue virus serotypes. Among them, ten conserved epitope peptides that were interferon-inducing were selected and found to be conserved among all the four dengue serotypes. The vaccine was formulated using antigenic, non-toxic and conserved multi epitopes discovered in the in-silico study. Further, the molecular docking and molecular dynamics predicted stable interactions between predicted vaccine and immune receptor, TLR-5. Finally, one of the mapped epitope peptides was synthesized for the validation of antigenicity and antibody production ability where the in-vivo tests on rabbit model was conducted. Our in-vivo analysis clearly indicate that the imunogen designed in this study could stimulate the production of antibodies which further suggest that the vaccine designed possesses good immunogenicity., Competing Interests: Authors UK, and ARS were employed by the company STEMskills Research and Education Lab Private Limited, Faridabad, Haryana, India. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2022 Kaushik, G, Gupta, Kalra, Shaikh, Cavallo and Chawla.)
- Published
- 2022
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40. First Report of a Paediatric Collision Tumour in the Liver Recognised After Liver Transplantation: Blissful Ignorance Has Benefits!
- Author
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Krishnan SK, Mouleeswaran KS, Gopal P, Patcha R, Ramakrishna SH, Karnan P, Malleeswaran S, Varghese J, and Reddy MS
- Abstract
Liver tumours are uncommon in the paediatric population, constituting 1-2 % of all paediatric tumours and 4% of all paediatric liver tumours. Hepatoblastoma followed by hepatocellular carcinoma is the most common tumours in this age group. Simultaneous development of two discrete liver tumours of distinct histologies (collision tumour) has been occasionally reported in adults but never in children. We hereby present the first reported case of hepatic collision tumours (hepatocellular carcinoma and cholangiocarcinoma) in the explant liver of a child who underwent living donor liver transplantation for end-stage liver disease and severe hepatopulmonary syndrome. The manuscript describes the clinical, radiological and histopathological findings of this case and also highlights the dilemma associated with management of this case had the diagnosis been made in the preoperative setting and also about the proposed management plan for this case in the postoperative period., (© 2021 Indian National Association for Study of the Liver. Published by Elsevier B.V. All rights reserved.)
- Published
- 2022
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41. Identifying opportunities to advance health equity in interventional cardiology: Structural heart disease.
- Author
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Allana SS, Alkhouli M, Alli O, Coylewright M, Horne A, Ijioma N, Kadavath S, Pineda AM, Sanchez C, Schreiber TL, Shah AP, Smith C, Suradi H, Sylvia KE, Young M, and Krishnan SK
- Subjects
- Healthcare Disparities, Humans, Treatment Outcome, Cardiology, Health Equity, Heart Diseases diagnostic imaging, Heart Diseases therapy
- Abstract
Health care practices are influenced by variety of factors. These factors that include social determinants, race and ethnicity, and gender not only affect access to health care but can also affect quality of care and patient outcomes. These are a source of health care disparities. This article acknowledges that these disparities exist in getting optimal care in structural heart disease, reviews the literature and proposes steps that can help reduce these disparities on personal and committee levels., (© 2021 Wiley Periodicals LLC.)
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- 2022
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42. Descriptive Epidemiology of Gastrointestinal Cancers: Results from National Cancer Registry Programme, India.
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S ST, Krishnan SK, Das P, Sudarshan KL, Kotian CM, Santhappan S, Vishwakarma MB, N S, and Mathur P
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- Adult, Aged, Humans, Incidence, India epidemiology, Male, Middle Aged, Registries, Regression Analysis, Gastrointestinal Neoplasms epidemiology
- Abstract
Purpose: This study aims to determine the incidence, histology, clinical extent of disease, and trends of gastrointestinal (GI) cancers in India., Methods: GI cancer cases diagnosed between 2012-2016 from 28 Population-Based Cancer Registries and 58 Hospital Based Cancer Registries under the National Cancer Registry Programme were included. Crude incidence rate and age-standardized incidence rates (AARs) were calculated. Joinpoint regression program, 4.0.1 was used for trend analysis for data from 1982 to 2016, and a P-value of <<0.05 was considered statistically significant., Results: GI cancers' occurrence was more common among men (60.5%) than in women (39.5%). The incidence of GI cancer was highest in India's northeast region, Aizawl district (AAR 126.9) among males, and in Papumpare district (AAR 75.9) among females. The commonest cancer among men was cancer of the esophagus (28.2%), followed by stomach cancer (21%) and rectum cancer (14.3%). Among women, cancer of the esophagus (25.7%), gallbladder (23.8%), stomach (14.8%), and rectum (14.6%) were common. Adenocarcinoma (57.83%) was the commonest type of GI tumors, followed by Squamous Cell neoplasms (25.99%). Majority of the GI cancers presented at the locoregional stage, but cancer of the gall bladder and pancreas presented at advanced stages. A rising trend for cancers of the colon, rectum, liver, gall bladder, pancreas was seen, while a declining trend was observed for stomach and oesophageal cancer., Conclusion: Our study highlights an increasing magnitude of GI cancers across different regions of India. Cancer registries form an essential tool for surveillance of GI cancers thus guiding prevention, early detection, and control programs.
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- 2022
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43. Acceptability, Utility, and Cost of a Mobile Health Cancer Screening Education Application for Training Primary Care Physicians in India.
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Subramanian S, Jose R, Lal A, Augustine P, Jones M, Gopal BK, Swayamvaran SK, Saroji V, Samadarsi R, and Sankaranarayanan R
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- Early Detection of Cancer, Female, Humans, India, Mobile Applications, Physicians, Primary Care, Telemedicine, Uterine Cervical Neoplasms
- Abstract
Purpose: Mobile health (mHealth)-based oncology education can be a powerful tool for providing cancer screening knowledge to physicians, as mobile technology is widely available and inexpensive. We developed a mobile application (M-OncoED) to educate physicians on cancer screening and tested the acceptability, utility, and cost of two different approaches to recruit physicians., Methods: M-OncoED was designed to perform pre- and postlearning assessments through the in-built quizzes; present case studies and educational materials for cervical, breast, and oral cancer screening; collect responses to interactive queries; document module completion; send reminders and alerts; and track user metrics, including number of sessions to complete each module and time spent per session. We tested two recruitment approaches: a broad-scale recruitment group, for which we relied on e-mails, messaging apps (e.g., WhatsApp), and phone calls, and the targeted recruitment group, for which we conducted a face-to-face meeting for the initial invitation., Results: Overall, about 35% of those invited in the targeted group completed the course compared with about 3% in the broad-based recruitment group. The targeted recruitment approach was more cost-efficient ($55.33 vs. $109.43 per person). Cervical cancer screening knowledge increased by about 30 percentage points, and breast cancer screening knowledge increased by 10 percentage points. There was no change in knowledge for oral cancer scorings., Conclusion: This study has demonstrated the feasibility and utility of using an mHealth app to educate physicians. A more intensive hands-on recruitment approach is likely required to engage physicians to download and complete the app. Future studies should assess the impact of mHealth tools on physician behavior and patient outcomes., Implications for Practice: Mobile health (mHealth)-based oncology education can be a powerful tool for providing cancer screening knowledge to physicians, as mobile technology is widely available and inexpensive. This study has demonstrated the feasibility and utility of using an mHealth app to educate physicians and illustrates the type of recruitment approach (face-to-face) that is likely required to incentivize physicians to download the app and complete the training., (© 2021 The Authors. The Oncologist published by Wiley Periodicals LLC on behalf of AlphaMed Press.)
- Published
- 2021
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44. Delayed Expulsion of biliary cast after hepaticojejunostomy for post-liver transplantation biliary stricture-better cut than canulate?
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Krishnan SK, Varghese J, Patcha R, Hosaagrahara Ramakrishna S, and Reddy MS
- Subjects
- Constriction, Pathologic, Drainage, Female, Humans, Infant, Liver Failure surgery, Living Donors, Anastomosis, Roux-en-Y, Cholestasis surgery, Liver Transplantation methods, Postoperative Complications surgery
- Abstract
Background: Biliary strictures after living donor liver transplantation (LDLT) are a significant cause of post-transplant morbidity. Endoscopic therapy is usually the first choice of treatment though surgical treatment may provide better biliary drainage., Methods: We report a case of LDLT performed in a child for acute liver failure who developed an anastomotic biliary stricture with biliary cast formation. We performed a Roux en Y hepaticojejunostomy to treat the stricture., Results: Allograft function improved after surgery with no further episodes of cholangitis. Two months after the surgery, the child passed a large biliary cast in the stools. This reiterates the advantage of wide biliary drainage provided through surgical therapy., Conclusions: Surgery for biliary strictures following LDLT may provide superior long term biliary drainage- especially when biliary casts are present., (© 2021 Wiley Periodicals LLC.)
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- 2021
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45. SSTP1, a Host Defense Peptide, Exploits the Immunomodulatory IL6 Pathway to Induce Apoptosis in Cancer Cells.
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Gopalakrishnan S, Uma SK, Mohan G, Mohan A, Shanmugam G, Kumar VTV, J S, Chandrika SK, Vasudevan D, Nori SRC, Sathi SN, George S, and Maliekal TT
- Subjects
- Animals, Cell Line, Tumor, Humans, Amphibian Proteins immunology, Antimicrobial Cationic Peptides immunology, Anura, Apoptosis immunology, Interleukin-6 immunology, Neoplasms immunology
- Abstract
While the immunomodulatory pathways initiated in immune cells contribute to therapeutic response, their activation in cancer cells play a role in cancer progression. Also, many of the aberrantly expressed immunomodulators on cancer cells are considered as therapeutic targets. Here, we introduce host defense peptide (HDP), a known immuomodulator, as a therapeutic agent to target them. The cationic host defense peptides (HDPs), an integral part of the innate immune system, possess membranolytic activity, which imparts antimicrobial and antitumor efficacy to it. They act as immunomodulators by activating the immune cells. Though their antimicrobial function has been recently reassigned to immunoregulation, their antitumor activity is still attributed to its membranolytic activity. This membrane pore formation ability, which is proportional to the concentration of the peptide, also leads to side effects like hemolysis, limiting their therapeutic application. So, despite the identification of a variety of anticancer HDPs, their clinical utility is limited. Though HDPs are shown to exert the immunomodulatory activity through specific membrane targets on immune cells, their targets on cancer cells are unknown. We show that SSTP1, a novel HDP identified by shotgun cloning, binds to the active IL6/IL6Rα/gp130 complex on cancer cells, rearranging the active site residues. In contrast to the IL6 blockers inhibiting JAK/STAT activity, SSTP1 shifts the proliferative IL6/JAK/STAT signaling to the apoptotic IL6/JNK/AP1 pathway. In IL6Rα-overexpressing cancer cells, SSTP1 induces apoptosis at low concentration through JNK pathway, without causing significant membrane disruption. We highlight the importance of immunomodulatory pathways in cancer apoptosis, apart from its established role in immune cell regulation and cancer cell proliferation. Our study suggests that identification of the membrane targets for the promising anticancer HDPs might lead to the identification of new drugs for targeted therapy., Competing Interests: A patent application has been filed for the peptide, SSTP1 in USA. “Apoptosis Inducing Peptide (SSTP1)”, PCT/IN2021/050371, in the name of Rajiv Gandhi Centre for Biotechnology, with TM & SG as Investigators. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2021 Gopalakrishnan, Uma, Mohan, Mohan, Shanmugam, Kumar, J, Chandrika, Vasudevan, Nori, Sathi, George and Maliekal.)
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- 2021
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46. Publication analysis in Bay for Bengal Initiative for Multi-Sectoral Technical and Economic Cooperation Nations.
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Janodia M, Narayan AI, Venkata SK, and Chogtu B
- Subjects
- Humans, India, Research Personnel, Authorship, Bibliometrics
- Abstract
Background: Research output provides an insight into the development of the scientific capability of a country. Budget allocation for research and development (R&D) is directly proportional to the research output of a country. While developed countries spend a significant percentage of their GDP on R&D, developing countries do not have enough resources to invest in R&D. Countries in the Bay of Bengal Initiative for Multi-Sectoral Technical and Economic Cooperation (BIMSTEC) Nations has received significantly less attention from outside the region in studying R&D and research publication scenario of the region. The research output of BIMSTEC countries was analyzed using various metrics in this paper. Methods: Data on citation per paper, Field Weight Citation Impact (FWCI), paper per researcher, collaborative publications, and output in top 10 percent journals was extracted from one of the largest abstract and citation database of peer-reviewed literature, Scopus and its affiliate SciVal, for a period of 6 years between 2012-2017. Percentage of R&D spend, researchers per million population, and total scientific output were extracted from World Bank data. Results: India and Thailand have a higher quantum of publications compared to other countries. Subjects like clinical, technology, Computer Science have a larger publication number as compared to other subject areas like Social Science, Arts, Education, Law, and Physiology. The researcher population and research spend of a nation have an evident implication on the publication though no direct relation can be derived. Conclusion: Huge disparities in terms of percentage of research spent, research output, papers per researcher, and output with national and international authorship differ for countries. Higher research spent and publication count are not positively correlated with better FWCI., Competing Interests: No competing interests were disclosed., (Copyright: © 2021 Janodia M et al.)
- Published
- 2021
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47. Design of a soft sensing technique for measuring pitch and yaw angular positions for a Twin Rotor MIMO System.
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Nayak S, Vemulapalli S, Venkata SK, and Shankar M
- Subjects
- Algorithms, Neural Networks, Computer
- Abstract
Background : This paper presents a soft sensor design technique for the estimation of pitch and yaw angular positions of a Twin Rotor MIMO System (TRMS). The objective of the proposed work was to calculate the value of pitch and yaw angular positions using a stochastic estimation technique. Methods : Measurements from optical sensors were used to measure fan blade rotations per minute (RPM). The Kalman filter, which is a stochastic estimator, was used in the proposed system and its results were compared with those of the Luenberger observer and neural network. The Twin Rotor MIMO System is a nonlinear system with significant cross-coupling between its rotors. Results : The estimators were designed for the decoupled system and were applied in real life to the coupled TRMS. The convergence of estimation to the actual values was checked on a practical setup. The Kalman filter estimators were evaluated for various inputs and disturbances, and the results were corroborated in real-time. Conclusion : From the proposed work it was seen that the Kalman filter had at least Integral Absolute Error (IAE), Integral Square Error (ISE), Integral Time Absolute Error (ITAE) as compared to the neural network and the Luenberger based observer., Competing Interests: No competing interests were disclosed., (Copyright: © 2021 Nayak S et al.)
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- 2021
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48. A bibliometric study on the research outcome of Brazil, Russia, India, China, and South Africa.
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I Narayan A, Chogtu B, Janodia M, and Venkata SK
- Subjects
- Brazil, China, India, Russia, South Africa, Bibliometrics
- Abstract
Background : Publication is one of the quantitative measures of countries' contribution to research and innovation. This paper attempts to understand the publication related information of the BRICS countries (Brazil, Russia, India, China, and South Africa). Methods : Detailed analysis of publications on the basis of collaboration, research area, number of publications, percentage of Gross Domestic Product (GDP) spent on research, and citation is presented in the paper. An attempt is also made to understand the relations between each of the parameters and the overall performance of the country. Results : Times Higher Education global ranking is considered as a measure to validate the claims of this paper. This study shows that among the BRICS nations, China with the highest percentage of GDP spent on research has also the highest number of researchers and publication output whereas South Africa excels in terms of number of international collaborative publications and publications in high impact journals. This article has highlighted the distribution of publications as per the subject area with India leading in the area of Computer Science. Discussion : Results showed a strong relationship between each of the parameters discussed on the research performance of a country., Competing Interests: No competing interests were disclosed., (Copyright: © 2021 I Narayan A et al.)
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- 2021
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49. Genome wide association mapping for heat tolerance in sub-tropical maize.
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Longmei N, Gill GK, Zaidi PH, Kumar R, Nair SK, Hindu V, Vinayan MT, and Vikal Y
- Subjects
- Genome-Wide Association Study, India, Phenotype, Plant Breeding, Polymorphism, Single Nucleotide, Thermotolerance, Zea mays genetics
- Abstract
Background: Heat tolerance is becoming increasingly important where maize is grown under spring season in India which coincide with grain filling stage of crop resulting in tassel blast, reduced pollen viability, pollination failure and barren ears that causes devastating yield losses. So, there is need to identify the genomic regions associated with heat tolerance component traits which could be further employed in maize breeding program., Results: An association mapping panel, consisting of 662 doubled haploid (DH) lines, was evaluated for yield contributing traits under normal and natural heat stress conditions. Genome wide association studies (GWAS) carried out using 187,000 SNPs and 130 SNPs significantly associated for grain yield (GY), days to 50% anthesis (AD), days to 50% silking (SD), anthesis-silking interval (ASI), plant height (PH), ear height (EH) and ear position (EPO) were identified under normal conditions. A total of 46 SNPs strongly associated with GY, ASI, EH and EPO were detected under heat stress conditions. Fifteen of the SNPs was found to have common association with more than one trait such as two SNPs viz. S10_1,905,273 and S10_1,905,274 showed colocalization with GY, PH and EH whereas S10_7,132,845 SNP associated with GY, AD and SD under normal conditions. No such colocalization of SNP markers with multiple traits was observed under heat stress conditions. Haplotypes trend regression analysis revealed 122 and 85 haplotype blocks, out of which, 20 and 6 haplotype blocks were associated with more than one trait under normal and heat stress conditions, respectively. Based on SNP association and haplotype mapping, nine and seven candidate genes were identified respectively, which belongs to different gene models having different biological functions in stress biology., Conclusions: The present study identified significant SNPs and haplotype blocks associated with yield contributing traits that help in selection of donor lines with favorable alleles for multiple traits. These results provided insights of genetics of heat stress tolerance. The genomic regions detected in the present study need further validation before being applied in the breeding pipelines.
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- 2021
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50. Ni-Doped ZrO 2 nanoparticles decorated MW-CNT nanocomposite for the highly sensitive electrochemical detection of 5-amino salicylic acid.
- Author
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Nataraj N, Krishnan SK, Chen TW, Chen SM, and Lou BS
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- Humans, Mesalamine blood, Mesalamine urine, Models, Molecular, Molecular Conformation, Nanocomposites chemistry, Electrochemistry methods, Limit of Detection, Mesalamine analysis, Nanoparticles chemistry, Nanotubes, Carbon chemistry, Nickel chemistry, Zirconium chemistry
- Abstract
In this work, Ni-doped ZrO
2 nanoparticles (NPs) were used to decorate multi-walled carbon nanotubes (MWCNTs) to obtain a Ni-ZrO2 /MWCNT nanocomposite, which acted as an efficient electrode material for the highly sensitive electrochemical detection of the anti-inflammatory drug 5-amino salicylic acid (5-ASA). The Ni-ZrO2 NPs were obtained through a facile co-precipitation method, and the subsequent support of these Ni-ZrO2 NPs onto MWCNTs was accomplished via an ultrasonication technique. Supporting Ni-ZrO2 NPs on MWCNTs not only results in excellent catalytic properties, but it also substantially enhances the surface area, electrical conductivity, and electron transfer process. The electrochemical activity of the synthesized Ni-ZrO2 /MWCNT nanocomposite was systematically investigated via cyclic voltammetry (CV) and differential pulse voltammetry (DPV) techniques. The constructed Ni-ZrO2 /MWCNT-modified glassy carbon (GC) electrode manifests superior electrocatalytic oxidation activity toward 5-ASA, with a lower peak potential compared with Ni-ZrO2 -NP- and MWCNT-modified GC electrodes. Importantly, the proposed biosensor exhibited excellent sensitivity during the detection of 5-ASA with a wide linear concentration range (0.001-500 μM) and a low detection limit of 0.0029 μM. Moreover, the biosensor demonstrated excellent repeatability, reproducibility, stability, and high specificity toward 5-ASA detection in the presence of different interfering species. Furthermore, the biosensor showed satisfactory recovery rates in complex biological samples, such as human blood serum, human urine, and 5-ASA tablet samples.- Published
- 2021
- Full Text
- View/download PDF
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