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Jayaraman, Aravindan,Lee, Sunwoo American Chemical Society 2019 ORGANIC LETTERS Vol.21 No.19
<P>Palladium-catalyzed decarboxylative coupling reactions using alkynoic acids and 1-fluoro-2,2-diiodovinylarenes provide mono- and dialkynylfluoroalkenes with high selectivity. When the reaction was conducted using DBU/DMSO, the hydrodeiodinated monoalkynylfluoroalkene product was formed, whereas performing the reaction using Et<SUB>3</SUB>N/THF gave the dialkynylfluoroalkene product. Both reaction conditions gave high yields of the desired enyne and endiyne products bearing fluorine atoms.</P> [FIG OMISSION]</BR>
Jayaraman, Bhaskar,Valiathan, Gopalakrishnan Mohan,Jayakumar, Keerthivasan,Palaniyandi, Arunmozhi,Thenumgal, Siji Jacob,Ramanathan, Arvind Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.11
Background: There have been case reports of oral squamous cell carcinoma arising from gingival overgrowth induced by phenytoin - an antiepileptic drug. However, a detailed analysis for the presence of mutations in p53 and ras genes, which are the two most frequently mutated genes in cancers, in phenytoin induced gingival overgrowth tissues has hitherto not been performed. Methods: Cellular DNA isolated from twenty gingival overgrowth tissues collected from patients undergoing phenytoin therapy were amplified using primers for p53 (exons 5-8) and H-ras (exons 1-2) genes. The PCR amplicons were then gel purified and subjected to direct sequencing analysis to screen for mutations. Results: Direct sequencing of twenty samples of phenytoin induced gingival growth did not identify mutations in any of the exons of p53 and H-ras genes that were analyzed. Conclusion: Our result indicates that mutational alteration of p53 and H-ras genes is infrequent in phenytoin induced gingival growth, which thus suggests a non malignant nature of this pathology. The findings in the present study are clinically significant as a large number of epileptic patients are treated with phenytoin.
Jayaraman, Aravindan,Lee, Sunwoo American Chemical Society 2019 ORGANIC LETTERS Vol.21 No.10
<P>A variety of arylalkynoic acids reacted with 1,3-diiodo-5,5-dimethylhydantoin and HF·pyridine in the presence of AgOAc to provide the corresponding 1-fluoro-2,2-diiodovinylarenes in good yields and high regioselectivity. In addition, Pd-catalyzed cross-coupling reaction of 1-fluoro-2,2-diiodovinylarenes afforded diaryl coupling products in the Suzuki reaction and monoaryl coupling products with high stereoselectivity in the Hiyama reaction. It was found that C-F-activated borylation of fluoroalkenes using Pd catalyst afforded the vinylboranes with good yields.</P> [FIG OMISSION]</BR>
Thortveitite phase manganese vanadate (Mn2V2O7) for the removal of model organic pollutants
Jayaraman Venkatesan,Ganesan Mathankumar,Mani Alagiri,김도형 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.8
Photocatalysis is useful for the long-term goal of a pollution-free environment. However, the development of new photoactive materials with enhanced photoconversion efficiency remains a serious bottleneck. This study demonstrates the preparation of low-cost, nontoxic, rod-like β-Mn2V2O7 using a simple, cost-effective fabrication method. The proposed photoactive material was characterized using several analytical techniques to determine its physiochemical properties, while its photocatalytic ability for the removal of organic pollutants under direct sunlight was also assessed. The prepared β-Mn2V2O7 was found to efficiently remove both Rhodamine B and methylene blue from an aqueous solution. The photoinduced and ultra-sound-assisted catalytic reduction of 4-nitrophenol (4-NP) was also demonstrated. The hydrogen-evolved photocatalytic removal of 4-NP was evaluated with different amounts of ethanol as a scavenger, with 10% ethanol exhibiting optimal efficiency. The superior organic pollutant removal ability of the proposed material is ascribed to its high surface area, superior optical properties, and suitable band edges.
2P-362 Study on the Conformational Distance of Transmembrane Proteins Using Joint-based Descriptor
( Jayaraman Thangappan ),이선구 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Joint-based descriptor is a new level of macroscopic descriptor for protein structure using joints of secondary structures as a basic element. Here, we propose how the joint-based descriptor can be applied to examine the conformational distances or differences of transmembrane (TM) proteins. First, the conformational distances of GPCR A family and other 7 TM proteins were evaluated. This provided the information on the distant and close families or superfamilies to GPCR A family and permitted the identification of conserved local conformations. Second, computational models of GPCR A family proteins were validated, which enabled us to estimate how much they reproduce the native conformation of GPCR A proteins at global and local conformational level. Finally, the conformational distances between active and inactive states of GPCR proteins were estimated, which identified the difference of local conformation.
Jayaraman Theerthagiri,Govindarajan Durai,K. Karuppasamy,Prabhakarn Arunachalam,Venugopal Elakkiya,Parasuraman Kuppusami,Thandavarayan Maiyalagan,김현석 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.67 No.-
Supercapacitors (SCs) has gained an impressive concentration by the researchers due to its advantages such as high energy and power densities, long cyclic life, rapid charge–discharge rates, low maintenance and desirable safety. Hence it has been widely utilized in energy storage and conversion devices. Among the different components of SC, electrodes play a vital role in the performances of SCs. In this review, we present the recent advances in 2-D nanostructured metal nitrides, carbides, and phosphides based materials for SC electrodes. Finally, the electrochemical stability and designing approach for the future advancement of the electrode materials are also highlighted.