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Journal of Rare Earths 2013年第5期31卷 477-484页

作者： Azhagapillai prabhu Ahmed Al Shoaibi Chandrasekar Srinivasakannan Muthaiahpillai palanichamy velayutham Murugesan Department of Chemical Engineering The Petroleum InstituteAbu DhabiUAE Department of Chemistry Anna University

Cerium incorporated KIT-6 mesoporous materials were synthesized through direct hydrothermal method and characterized by using X-ray diffraction （XRD）, nitrogen sorption isotherm （BET）, Fourier transform infrared spectroscopy （FT-IR）, inductively coupled plasma - atomic emission spectroscopy （ICp-AES）, diffuse reflectance ultraviolet visible spectroscopy （DRS-UV-Vis）, ther- mogravimetric analysis （TGA）, scanning electron microscopy （SEM） and transmission electron microscopy （TEM） methods. It ap- peared that stable cerium ions were inserted into the silica framework of KIT-6, thus generating acid properties in their host materials. The catalytic activity of Ce-KIT-6 materials was evaluated in the vapor phase dehydration of cyclohexanol to cyclohexene and dicy- clohexyl ether at different temperatures with various Si/Ce molar ratios. Ce-KIT-6 （25） showed higher activity with 54% cyclohexa- nol conversion and 64% selectivity to cyclohexene. The catalytic results indicated that Ce-KIT-6 mesoporous materials could be used as versatile and stable acid catalysts.

关键词： Ce-KIT-6 dehydration eyclohexanol cyclohexene dicyclohexyl ether rare earths

protective effect of tannins from Ficus racemosa in hypercholesterolemia and diabetes induced vascular tissue damage in rats

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Asian pacific Journal of Tropical Medicine 2012年第5期5卷 367-373页

作者： velayutham Ravichandiran Sankaradoss Nirmala KFH Nazeer Ahamed Department of pharmacognosy School of Pharmaceutical SciencesVels Institute of Science Technology and Advanced Studies(VISTAS)Vels UniversityPallavaramChennai 600 117India Department of pharmacology School of Pharmaceutical Sciences.Vels Institute of Science Technology and Advanced Studies(VISTAS)Vels UniversityPallavaramChennai 600 117India

Objective:To evaluate the protective effect of tannins from Ficus racemosa(***) on the lipid profile and antioxidant parameters in high fat meal and streptozotocin induced hypercholestremia associated diabetes model in ***:The crude tannin fraction was separated from the acetone(70%v/v) bark extract of *** administratipn of tannin fraction(TF)(100 & 200 mg/kg body weight) to rats fed with high fat meal for 30 days (4%cholesterol,1%cholic acid,0.5%egg albumin) and injected with streptozotocin(35 mg/ kg *** citrate buffer on 14th day).Results:The administration of TF significantly reverse the increased blood glucose,total cholesterol,triglycerides,low density lipoprotein and also significandy restored the insulin and high density lipoprotein in the *** addition tannins significantly restored the activity of antioxidant enzymes such as superoxide dismutase,catalase and decreased the,glutathione peroxidase,and glutathione,thereby restoring the antioxidant status of the organs to almost normal ***:The results of this study show that two different doses of tannin supplementation had a favorable effect on plasma glucose and lipid profile *** also had an influence on attenuating oxidative stress in diabetic tats.

关键词： Diabetes Vascular tissue damage Streptozotocin Tannins Rat

CeAlpO-5分子筛催化剂上二苯基甲烷选择性氧化生成二苯甲酮(英文)

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催化学报 2012年第7期33卷 1086-1094页

作者： Subbiah DEVIKA Muthiahpillai pALANICHAMY velayutham MURUGESAN Department of Chemistry Anna University

Selective oxidation of diphenylmethane to benzophenone requires active and selective catalysts. The framework incorporation of cerium in AlpO-5 molecular sieves creates active cerium sites in isolation. These active sites are responsible for selective oxidation. Cerium incorporated AlpO-5 with different Al/Ce ratios were synthesized, and the vapor phase oxidation of diphenylmethane in air over these catalysts was studied at 250, 275, 300, 325, and 350 °C. The diphenylmethane conversion and selectivity for benzophenone were more than 90%. CeAlpO-5(25) was found to be more active than other catalysts. The stability of the catalyst was verified by the time on stream study which indicated steady diphenylmethane conversion and benzophenone selectivity. Hence framework incorporated CeAlpO-5 molecular sieves are stable and active catalysts for the selective oxidation of diphenylmethane.

关键词： CeAlpO-5 molecular sieve hydrothermal synthesis oxidation diphenylmethane benzophenone

Cellular interplay to 3D in vitro microphysiological disease model:cell patterning microbiota-gut-brain axis

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Bio-Design and Manufacturing 2024年第3期7卷 320-357页

作者： Kamare Alam Lakshmi Nair Souvik Mukherjee Kulwinder Kaur Manjari Singh Santanu Kaity velayutham Ravichandiran Sugato Banerjee Subhadeep Roy Department of pharmacology and Toxicology National Institute of Pharmaceutical Education and ResearchKolkataWest Bengal 700054India Department of pharmaceutical Sciences Assam UniversitySilchar 788011India Department of pharmaceutical Sciences Guru Ghasidas UniversityKoniBilaspur 495009C.G.India School of pharmacy and Biomolecular Sciences RCSI University of Medicine and Health SciencesDublin D02 YN77Ireland Tissue Engineering Research Group Department of Anatomy and Regenerative MedicineRCSI University of Medicine and Health SciencesDublin D02 YN77Ireland Department of pharmaceutics National Institute of Pharmaceutical Education and ResearchKolkataWest Bengal 700054India Department of Natural products National Institute of Pharmaceutical Education and ResearchKolkataWest Bengal 700054India

The microbiota-gut-brain axis(MGBA)has emerged as a key prospect in the bidirectional communication between two major organ systems:the brain and the *** between the two organ systems allows the body to function without disease,whereas dysbiosis has long-standing evidence of etiopathological *** most common communication paths are the microbial release of metabolites,soluble neurotransmitters,and immune ***,each pathway is intertwined with a complex *** the emergence of in vitro models and the popularity of three-dimensional(3D)cultures and Transwells,engineering has become easier for the scientific understanding of neurodegenerative *** paper briefly retraces the possible communication pathways between the gut microbiome and the *** further elaborates on three major diseases:autism spectrum disorder,parkinson’s disease,and Alzheimer’s disease,which are prevalent in children and the *** diseases also decrease patients’quality of ***,understanding them more deeply with respect to current advances in in vitro modeling is crucial for understanding the *** of MGBA in the laboratory uses many molecular technologies and biomaterial *** and organoids provide a more realistic picture of the cell and tissue structure than *** them with the Transwell system offers the advantage of compartmentalizing the two systems(apical and basal)while allowing physical and chemical cues between ***-edge technologies,such as bioprinting and microfluidic chips,might be the future of in vitro modeling,as they provide dynamicity.

关键词： Microbiota-gut-brain axis Neurodegeneration 3D disease model Organoid Transwell system

Review of Cellulose Smart Material: Biomass Conversion process and progress on Cellulose-Based Electroactive paper

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Journal of Renewable Materials 2018年第1期6卷 1-25页

作者： S.H.Hassan Lee Hwei Voon T.S.velayutham Lindong Zhai Hyun Chan Kim Jaehwan Kim Nanotechnology and Catalysis Research Center(NanoCat) Institute of Postgraduate StudiesUniversity of Malaya50603 Kuala LumpurMalaysia Low Dimensional Materials Research Center Department of PhysicsFaculty of ScienceUniversity of Malaya50603 Kuala LumpurMalaysia Department of Mechanical Engineering Inha UniversityIncheon 22212South Korea

Cellulose is a renewable biomass material and natural polymer which is abundantly available on Earth,and includes agricultural wastes,forestry residues,and woody *** excellent and smart characteristics of cellulose materials,such as lightweight,biocompatibility,biodegradability,high mechanical strength/stiffness and low thermal expansibility,have made cellulose a highpotential material for various industry *** has recently been discovered as a smart material in the electroactive polymers family which carries the name of cellulose-based electroactive paper(EApap).The shear piezoelectricity in cellulose polymers is able to induce large displacement output,low actuation voltage,and low power consumption in the application of biomimetic sensors/actuators and electromechanical *** present study provides an overview of biomass pretreatment from various lignocellulosic cellulose(LC)resources and nanocellulose production via TEMpO-mediated oxidation reaction,followed by the production of different types of EApap versus its performance,and lastly the applications of EApap in different areas and ***,LC biomass consists mainly of cellulose having a small content of hemicelluloses and lignins which form a defensive inner structure against the degradation of plant cell ***,selective approaches are discussed to ensure proper extraction of cellulosic fibers from complex biomass for further minimization to *** addition,a comprehensive review of the development of cellulose-based EApap as well as fabrication,characterization,performance enhancement and applications of EApap devices are discussed herein.

关键词： Biomass pretreatment nanocellulose renewable materials smart materials actuators

Al-MCM-48分子筛对苯酚与乙酸异丙酯异丙基化反应的催化性能(英文)

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催化学报 2012年第3期33卷 478-486页

作者： Kandan VENKATACHALAM pitchai VISUVAMITHIRAN Balachandran SUNDARAVEL Muthiapillai pALANICHAMY velayutham MURUGESAN Department of Chemistry Anna University

Al-MCM-48 molecular sieves (Si/Al molar ratios = 25, 50, 75, and 100) were synthesized hydrothermally using cetyltrimethyl-ammonium bromide as the structure directing template. The orderly arrangement of mesopores was evident from the low angle X-ray diffraction patterns and transmission electron microscopy images. The catalytic performance of the materials was evaluated in the vapor phase isopropylation of phenol with isopropyl acetate. phenol conversion decreased with the increase in the Si/Al ratio of the catalysts. The major reaction product was 4-isopropyl phenol with 78% selectivity. The delocalization of phenolic oxygen electron pair over the aromatic ring promoted para-selective alkylation. Such delocalization could be aided by the hydrophilic surface of the molecular sieves. Although an ester was used as the alkylating agent, phenyl isopropyl ether was not formed in the reaction.

关键词： MCM-48分子筛异丙基苯酚醋酸异丙酯催化性能十六烷基三甲基溴化铵透射电子显微镜反应产物水热法合成

Is bactibilia a predictor of poor outcome of pancreaticoduodenectomy?

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Hepatobiliary & pancreatic Diseases International 2010年第1期9卷 65-68页

作者： Sivanpillay Mahadevan Sivaraj velayutham Vimalraj palanichamy Saravanaboopathy Shanmugasundaram Rajendran Sathyanesan Jeswanth palaniappan Ravichandran Rosy Vennilla Rajagopalan Surendran Institute of Surgical Gastroenterology and Liver Transplantation New Gastroenterology BlockGovernment Stanley Medical College Hospital

BACKGROUND:Although bile infection has been proposed to increase infective complications following pancreaticoduodenectomy,its association with infective complications and non-infective complications like pancreatic fistula is still ***:Seventy-six patients who had undergone pancreaticoduodenectomy between July 2007 and December 2008 were included in a prospective database and their data *** all patients intraoperative bile from the bile duct was ***,intra-operative,and post-operative variables were recorded and ***:Bile culture showed positive growth in 35 patients and negative growth in *** patients in the positive group underwent ERCp and *** patients with a positive bile culture had a higher incidence of infective complications including intra-abdominal abscess (n=8),wound infection (n=27),bacteremia (n=10),and renal insufficiency (n=9).There was no increase in the rate of non-infective complications of pancreaticoduodenectomy including pancreatic fistula (n=7),delayed gastric emptying (n=9),and post-operative hemorrhage (n=3).The hospital stay was significantly prolonged in the patients with a positive bile culture (p=0.0002).CONCLUSIONS:pre-operative biliary drainage is significantly associated with bile infection,and bile infection increases the overall rates of infective complications and renal *** of the high incidence of complications is associated with infected bile,routine intra-operative bile culture is recommended in patients undergoing ***-operative prophylaxis is dependent on sensitivity of cases to perioperative antibiotics and intraoperative bile culture *** of its significant association with infected bile,biliary stenting should be used in strictly selected cases.

关键词： bactibilia Whipples pancreaticoduodenectomy perioperative outcomes

Larvicidal activity of green synthesized silver nanoparticles using bark aqueous extract of Ficus racemosa against Culex quinquefasciatus and Culex gelidus

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Asian pacific Journal of Tropical Medicine 2013年第2期6卷 95-101页

作者： Kanayairam velayutham Abdul Abdul Rahuman Govindasamy Rajakumar Selvaraj Mohana Roopan Gandhi Elango Chinnaperumal Kamaraj Sampath Marimuthu Thirunavukkarasu Santhoshkumar Moorthy Iyappan Chinnadurai Siva Unit of Nanotechnology and Bioactive Natural products Post Graduate and Research Department of ZoologyC.Ahdul Hakeem CollegeMelvisharam-632 509Vellore DistrictTamil NaduIndia Organic & Medicinal Chemistry Research Laboratory Organic Chemistry DivisionSchool of Advanced SciencesVIT UniversityVellore-632 014Tamil NaduIndia Unit of Nanotechnology and Bioactive Natural products Post Graduate and Research Department of ZoologyC.Abdul Hakeem CollegeMelvisharam-632 509Vellore DistrictTamil NaduIndia

Objective:To investigate the larvicidal activity of synthesized silver nanoparticles（Ag Nps） utilizing aqueous bark extract of Ficus racemosa（***） was tested against fourth instar larvae of filariasis vector,Culex quinquefasciatus（***） and japanese encephalitis vectors,Culex gelidus（***）.Methods:The synthesized Ag Nps was characterized by UV-vis spectrum,X-ray diffraction（XRD）,Scanning electron microscopy（SEM） and Fourier transform infrared（FTIR）.The larvicidal activities were assessed for 24 h against the larvae of *** and *** with varying concentrations of aqueous bark extract *** and synthesized Ag ***50 and rp>2p> values were ***:The maximum efficacy was observed in crude aqueous extract of *** against the larvae of *** and ***(LC50=67.72 and 63.70 mg/L;rp>2p>=0.995 and 0.985) and the synthesized Ag Nps(LC50=12.00 and 11.21 mg/L;rp>2p>=0.997 and 0.990).*** Ag Nps showed the XRD peaks at 2θvalues of 27.61,29.60,35.48,43.48 and 79.68 were identified as （210）,（121）,（220）,（200） and（311） reflections,*** FTIR spectra of Ag Nps exhibited prominent peaks at 3 425,2 878,1 627 and 1 382 in the region 500-3 000 cmp>-1p>.The peaks correspond to the presence of a stretching vibration of（NH） C=O *** analysis showed shape in cylindrical,uniform and rod with the average size of 250.60 ***:The biosynthesis of silver nanoparticles using bark aqueous extract of *** and its larvicidal activity against the larvae of disease spreading *** maximum larvicidal efficacy was observed in the synthesized Ag Nps.

关键词： Ficus racemosa Culex quinquefasciatus Culex gelidus Electron microscopic study

Unsupervised Quick Reduct Algorithm Using Rough Set Theory

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Journal of Electronic Science and Technology 2011年第3期9卷 193-201页

作者： C. velayutham K. Thangavel the Department of Computer Science Aditana College of Arts and Science the Department of Computer Science PeriyarUniversity

Feature selection （FS） is a process to select features which are more informative. It is one of the important steps in knowledge discovery. The problem is that not all features are important. Some of the features may be redundant, and others may be irrelevant and noisy. The conventional supervised FS methods evaluate various feature subsets using an evaluation function or metric to select only those features which are related to the decision classes of the data under consideration. However, for many data mining applications, decision class labels are often unknown or incomplete, thus indicating the significance of unsupervised feature selection. However, in unsupervised learning, decision class labels are not provided. In this paper, we propose a new unsupervised quick reduct （QR） algorithm using rough set theory. The quality of the reduced data is measured by the classification performance and it is evaluated using WEKA classifier tool. The method is compared with existing supervised methods and the result demonstrates the efficiency of the proposed algorithm.

关键词： Index Terms--Data mining rough set supervised and unsupervised feature selection unsupervised quick reduct algorithm.

Metabolic Algorithm for Software Requirement Engineering

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Metabolic Algorithm for Software Requirement Engineering