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( Vasudevan Ramaswamy ),( Manoj Gupta ),( Aneela T ) 대한간학회 2017 춘·추계 학술대회 (KASL) Vol.2017 No.1
Aims: Wether internal biliary stenting can alter the occurrence of biliary complications and overall outcome in living donor liver transplantation (LDLT) is not clear. There are no randomised studies to suggest if stenting helps, in the current literature. Methods: Aim Describe our technique of placing the stent Assess impact of stent on biliary complications and overall outcome Methods: 30 consecutive recipients were randomized to biliary anastomosis with and without intraductal stent. Stent: 6F infant feeding tube, cut to15 cm, extending across anastomosis into duodenum & was placed before securing the corner knot on the posterior wall. Biliary anastomosis was performed using interrupted PDS 6-0 sutures. Stent was passed into the smaller duct when two ducts were anastomosed. Sten removal: endoscopically at six weeks, earlier in case of problems. Exclusion criteria: ABO incompatible transplant, retransplantation and hepaticojejunostomy Results: Demographic features & characteristics were similar in both groups. Right lobe without MHV was the commonest graft used, 2 patients in group B had right posterior sectoral graft. 60% of patients in both groups had bile duct diameter ≤ 4mm. Hospital & ICU stay was not statistically different between the groups (P=0.89). Incidence of biliary complications: 26.6% (8/30), 10% bile leak, 16.6% stricture. Group A: No Stent (%) Group B: Stent (%) Two duct to duct anastomosis 40 26.6 Biliary Complications 33.3 20 (p=0.49) Bile leak 6.6 13.3 Stricture 13.3 20 3 & 12month survival 93 100 18month survival 93 93 All patients with bile leaks in group A developed late strictures. There were no complications attributable to the stent or stent removal process. Conclusions: Use of internal biliary stent is safe and potentially beneficial in LDLT, quantum of which needs to be clarified by the full study.
Santhosh, P.,Gopalan, A.,Vasudevan, T.,Lee, Kwang-Pill Wiley Subscription Services, Inc., A Wiley Company 2006 Journal of applied polymer science Vol.101 No.1
<P>Composites of thermoplastic polyurethane (TPU) with poly(diphenylamine) (PDPA) were prepared by entrapping diphenylamine (DPA) molecules into the matrix of TPU and polymerizing DPA within the TPU matrix. Swelling rate of the parent TPU and the composites in 1M LiClO<SUB>4</SUB> in propylene carbonate solution were compared to understand the influence of the presence of PDPA in the composite in altering the morphology, conductivity, and electrolyte behavior. The nitrogen atoms in the PDPA interact and are likely to form hydrogen bonding with the carbonyl and ether groups in TPU. As a result, different morphology, thermal, and impedance behavior were witnessed for the composites in comparison to TPU. Results from differential scanning calorimetry, scanning electron microscopy (SEM), thermogravimetric analysis, and ac impedance measurements were obtained as supporting evidences. An increase in glass transition temperature for the composite in comparison to TPU infers the increase in phase mixing of soft and hard segment of TPU. The SEM micrograph shows the presence of fibrillar morphology of PDPA molecules in the composite. The ionic conductivity of the swelled composite was 1-fold higher than that of pure TPU. A schematic representation showing the interaction of PDPA molecules with TPU is presented. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 611–617, 2006</P>
이철재,Mohammad Rezaul Karim,T. Vasudevan,김희진,K. Raushan,정맹준,김동엽,이무상 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.7
Silver nanoparticles has been prepared by the γ-irradiation and in situ reduction methods. Based on the Raman spectra,TEM images, X-ray Diffraction (XRD) patterns and UV-vis spectra, the in situ reduction method is more stable and the average size of the silver nanoparticles is also smaller than by the γ-irradiation reduction method. It is identified that the silver ions interacting with nonbonding electrons of oxygen atom in the carbonyl group of polyvinylpyrrolidone (PVP) by the in situ reduction method. It is also found advantages of the in situ reduction method including no additional reducing agents, without γ-irradiations treatment and the room temperature treatment suitability.
Friction stir welding of F/M ODS steel plug and F/M steel tube
Kang, S.H.,Vasudevan, M.,Noh, S.,Jin, H.J.,Jang, J.,Kim, T.K. North-Holland ; Elsevier Science Ltd 2016 Fusion engineering and design Vol.109 No.1
Friction stir welding (FSW) was used for joining of oxide dispersion strengthened (ODS) steel plug and F/M steel tube. The dimensions of the tube included outer diameter of 7mm, wall thickness of 0.5mm. The objective was to find suitable process variables for gaining enough frictional heat from those thin and curved pieces. A specially designed jig was used for stabilization and slow rotation of tube during FSW. Additionally, the plug was designed to overlap the tube. Inconel 718 was used as FSW tool, the diameter was 3.5mm. The adequate rotation speed of the tool and jig were 1200rpm and 1.5rpm, respectively. The joining was successfully accomplished using above combination, showing a good possibility. The hoop stress tests of joint were conducted by blowing Ar gas into the tube, the flow rate of gas was 10MPa/min. The measured hoop stress was 70-90MPa, the value was at around 70% of the tube.
4E-BP is a target of the GCN2–ATF4 pathway during <i>Drosophila</i> development and aging
Kang, Min-Ji,Vasudevan, Deepika,Kang, Kwonyoon,Kim, Kyunggon,Park, Jung-Eun,Zhang, Nan,Zeng, Xiaomei,Neubert, Thomas A.,Marr II, Michael T.,Ryoo, Hyung Don The Rockefeller University Press 2017 The Journal of cell biology Vol.216 No.1
<P>Reduced amino acid availability attenuates mRNA translation in cells and helps to extend lifespan in model organisms. The amino acid deprivation activated kinase GCN2 mediates this response in part by phosphorylating elF2 alpha. In addition, the cap-dependent translational inhibitor 4E-BP is transcriptionally induced to extend lifespan in Drosophila melanogaster, but through an unclear mechanism. Here, we show that GCN2 and its downstream transcription factor, ATF4, mediate 4E-BP induction, and GCN2 is required for lifespan extension in response to dietary restriction of amino acids. The 4E-BP intron contains ATF4-binding sites that not only respond to stress but also show inherent ATF4 activity during normal development. Analysis of the newly synthesized proteome through metabolic labeling combined with click chemistry shows that certain stress-responsive proteins are resistant to inhibition by 4E-BP, and gcn2 mutant flies have reduced levels of stress-responsive protein synthesis. These results indicate that GCN2 and ATF4 are important regulators of 4E-BP transcription during normal development and aging.</P>
Lee, Chul-Jae,Karim, Mohammad Rezaul,Vasudevan, T.,Kim, Hee-Jin,Raushan, K.,Jung, Maeng-Joon,Kim, Dong-Yeub,Lee, Mu-Sang Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.7
Silver nanoparticles has been prepared by the $\gamma$-irradiation and in situ reduction methods. Based on the Raman spectra, TEM images, X-ray Diffraction (XRD) patterns and UV-vis spectra, the in situ reduction method is more stable and the average size of the silver nanoparticles is also smaller than by the $\gamma$-irradiation reduction method. It is identified that the silver ions interacting with nonbonding electrons of oxygen atom in the carbonyl group of polyvinylpyrrolidone (PVP) by the in situ reduction method. It is also found advantages of the in situ reduction method including no additional reducing agents, without $\gamma$-irradiations treatment and the room temperature treatment suitability.
Sasidharan Nishanth Kumar,Bala Nambisan,B. S. Dileep Kumar,Nisha Girija Vasudevan,Chellapan Mohandas,Vino T. Cheriyan,Ruby John Anto 대한약학회 2021 Archives of Pharmacal Research Vol.44 No.9
3,5-Dihydroxy-4-isopropylstilbene is a naturalphytoalexin and was first identified as bacterial secondarymetabolites. The aim of this study is to investigate in vitroantioxidant and anticancer activity of 3,5-dihydroxy-4-isopropystilbene purified from the cell free culture filtrateof Bacillus sp. N strain associated with rhabditid entomopathogenicnematode. Antioxidant activity was evaluatedby five separate methods: free radical scavenging, reducingpower assay, chelating effects on ferrous ions, NBTsuperoxide radical scavenging assay and hydroxyl radicalscavenging activity. The stilbene recorded powerful antioxidantactivity at various antioxidant systems in vitro. Thesuperoxide radical scavenging (92.1 %) and hydroxylradical scavenging (83.4 %) activities of the stilbenes at100 lg/ml were higher than the butylated hydroxyanisole,the known antioxidant agent. Anticancer activity of stilbenewas tested against breast cancer (MDAM B-231),cervical cancer (HeLa), lung cancer (A 549), colon cancer (HTL 116) cell lines using MTT method. The induction ofapoptosis was studied by morphological analysis, apoptoticcell staining, caspase 3 activation assay and cell cycleanalysis using flow cytometry. Stilbene induced significantmorphological changes and DNA fragmentation associatedwith apoptosis in HeLa cells. Acridine orange/ethidiumbromide stained cells indicated apoptosis induction bystilbene. Up-regulation of caspase 3 activity was also foundin cells treated with stilbene. Flow cytometry analysisshowed an increase in the percentage of apoptotic cells insub G0 phase (2.4 % in control plates to 11.4 %in 25 lg/mlof stilbene) confirming the stilbene induced apoptosis. Theresults of the present study showed that stilbene demonstrateda strong antioxidant and anticancer effects. Thesesuggest that stilbene may be used as possible naturalantioxidant and anticancer agents to control various humandiseases.