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Size tuning.and oxyg.n plasma induced pore formation on silica nanoparticles

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Prog.ess in Natural Science:Materials International 2012年第3期22卷 193-200页

作者： Remya nair Y. Yoshida T. Maekawa D. Sakthi Kumarn BioNano Electronics Research Center Graduate School of Interdisciplinary New Science Toyo University

Silica nanoparticles have been prepared from tetraethylorthosilicate dissolved in ethanol followed by base-catalyzed condensation. Earlier works reported that at least four parameters, namely concentration of tetraethylorthosilicate, ethanol, water and ammonia solution are needed to be optimized for the size tuning.of silica nanoparticles. In this work size tuning.of 5 nm-250 nm has been achieved by varying.a sing.e synthesis parameter i.e., the concentration of ammonia solution. Oxyg.n plasma was found to be successful for g.nerating.pores on silica nanoparticles without using.any structure directing.ag.nts. The properties and morpholog. of nanoparticles were investig.ted by transmission electron microscopy, scanning.electron microscopy, energ. dispersive X-ray spectroscopy and Fourier transformed infrared spectroscopy.

关键词： Silica nanoparticles Size tuning Plasma treatment Pore induction

Chang.s in g.owth and photosynthetic characteristics of Ocimum sanctum under g.owth reg.lator treatments

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Frontiers in Biolog. 2009年第2期4卷 192-199页

作者： Vadakkemuriyil DIVYA nair Cheruth Abdul JALEEL Rag.pathi g.PI Rajaram PANNEERSELVAM Stress Physiolog. Lab Department of BotanyAnnamalai UniversityTamil NaduIndia DMJM International(Cansult Maunsell/AECOM Ltd.) Consultant of Gardens Sector ProjectsAlain Municipality and Eastern EmiratesP.O.Box 1419Al-AinAbu DhabiUnited Arab Emirates

A field experiment was conducted to investig.te the effect of g.owth reg.lators on g.owth characteristics such as root leng.h,shoot leng.h,total leaf area,number of inflorescence per plant,number of flower per inflorescence,whole plant fresh weig.t and whole plant dry *** characteristics were also analyzed based on the same *** this,various photosynthetic pig.ent contents such as chlorophyll,carotenoid,anthocyanin and xanthophyll content were *** conventional g.owth reg.lator abscisic acid(ABA)and non-conventional g.owth reg.lator triazole compound paclobutrazol(PBZ)were *** leng.h increased due to g.owth reg.lator treatment,but shoot leng.h *** area was decreased due to g.owth reg.lator *** number of inflorescence increased in ABA treated plants,but it was decreased in PBZ treated *** ABA treated plants,the number of flowers per inflorescence was *** PBZ treated plants the number of inflorescence was *** whole plant fresh weig.t(FW)and dry weig.t(DW)were increased in ABA and PBZ treated *** was an increase in chlorophyll content in g.owth reg.lator treated plants compared to control,and it was more in PBZ treated *** carotenoid content was also increased in ABA and PBZ treated plants.

关键词： abscisic acid(ABA) g.owth characteristics Ocimum Sanctum paclobutrazol(PBZ) photosynthetic characteristics

Risk prediction model for cutaneous squamous cell carcinoma in adult cardiac allog.aft recipients

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World Journal of Transplantation 2021年第3期11卷 54-69页

作者： Nandini nair Zhiyong.Hu Dong.ing.Du Enrique g.ng.ra Division of Cardiolog. Department of Internal MedicineTexas Tech Health Sciences CenterLubbockTX 79430United States Department of Industrial Manufacturing and Systems EngineeringTexas Tech UniversityLubbockTX 79409United States Department of Cardiothoracic Surg.ry University of Alabama at BirminghamBirminghamAL 35233United States

BACKg.OUND Heart transplant recipients are at hig.er risk of developing.skin cancer than the g.neral population due to the long.term immunosuppression *** has been reported as one of the major causes of morbidity and mortality for patients after heart *** different types of skin cancers,cutaneous squamous cell carcinoma(cSCC)is the most common one,which requires timely screening.and better *** To identify risk factors and predict the incidence of cSCC for heart transplant *** We retrospectively analyzed adult heart transplant recipients between 2000 and 2015 extracted from the United Network for Org.n Sharing.*** whole dataset was randomly divided into a derivation set(80%)and a validation set(20%).Uni-and multivariate Cox reg.ession were done to identify sig.ificant risk factors associated with the development of *** operating.characteristics curves were g.nerated and area under the curve(AUC)was calculated to assess the accuracy of the prediction *** on the selected risk factors,a risk scoring.system was developed to stratify patients into different risk g.oups.A cumulative cSCC-free survival curve was g.nerated using.the Kaplan-Meier method for each g.oup,and the log.rank test was done to compare the interg.oup cSCC *** There were 23736 heart-transplant recipients during.the study period,and 1827 of them have been reported with *** predictors of post-transplant cSCC were older ag.,male sex,white race,recipient and donor human leukocyte antig.n(HLA)mismatch level,malig.ancy at listing.diag.osis with restrictive myopathy or hypertrophic myopathy,heart re-transplant,and induction therapy with OKT3 or *** multivariate model was used to predict the 5-,8-and 10-year incidence of cSCC and respectively provided AUC of 0.79,0.78 and 0.77 in the derivation set and 0.80,0.78 and 0.77 in the validation *** risk scoring.system assig.ed each patient with a

关键词： Cutaneous squamous cell carcinoma Heart transplantation Cox proportional hazard model Risk assessment Squamous cell carcinoma Mortality outcomes

Variability of Summer Monsoon Rainfall in India on Inter-Annual and Decadal Time Scales

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Atmospheric and Oceanic Science Letters 2013年第5期6卷 398-403页

作者： Porathur Vareed JOSEPH Bindu g.KULAPALAN Archana nair Shinu Sheela WILSON Nansen Environmental Research Centre India

Indian Summer Monsoon Rainfall(ISMR)exhibits a prominent inter-annual variability known as troposphere biennial oscillation.A season of deficient June to September monsoon rainfall in India is followed by warm sea surface temperature(SST)anomalies over the tropical Indian Ocean and cold SST anomalies over the western Pacific *** anomalies persist until the following.monsoon,which yields normal or excessive *** rainfall in India has shown decadal variability in the form of 30 year epochs of alternately occurring.frequent and infrequent droug.t monsoons since1841,when rainfall measurements beg.n in *** oscillations of monsoon rainfall and the well known decadal oscillations in SSTs of the Atlantic and Pacific oceans have the same period of approximately 60 years and nearly the same temporal *** both of these variabilities,anomalies in monsoon heat source,such as deep convection,and middle latitude westerlies of the upper troposphere over south Asia have prominent roles.

关键词：热带印度洋季风降水年代际变化时间尺度年际变化年代际振荡太平洋海温海温距平

A review on melatonin action as therapeutic ag.nt in cancer

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Frontiers in Biolog. 2018年第3期13卷 180-189页

作者： Soumya nair Sandra Suresh Arya Kaniyassery Panchami Jaya Jayanthi Abraham Microbial Biotechnolog. Laboratory School of Biosciences and Technology VIT University Vellore Tamil Nadu India

Melatonin is a hormone which is produced from pineal g.and in human and is said to have various impacts in human body like controlling.sleep wake cycle, reg.lating.the immune and cardiovascular system and reg.lating.the peripheral org.n functioning.to name a few. Researchers have reported that the melatonin levels correlates with cancer risks. In this review article, focus has been g.ven to the therapeutic applications and impact of melatonin hormone in human behavior and physiolog.c activities. Throug. this article we aim in compiling.the scattered information reg.rding.melatonin and its various aspects of importance in human system. We made an analysis of existing.hypothesis and studies published on melatonin and circadian rhythm, factors effecting.Melatonin secretions in body, sleep disturbances and cancer risks and melatonin therapy in cancer patients. Melatonin’s role as an endog.nous synchronizer, g.owing.evidence sug.ests its anti-oxidative activity as well as its having.a role in modulating.immune responses. Fluctuating.melatonin levels can be boosted by ing.sting.products containing.melatonin. A larg. portion of the examinations detailed by the researchers clearly conclude that keeping.up an impeccable sleep-wake cycle and having.a healthy diet is extremely important to keep up the reg.lar melatonin levels and in order to stay fit. Melatonin is considered as a critical hormone that controls and reg.lates many functions in our body. Melatonin production is emphatically related to the nig.t time duration. Its most absolute biolog.cal role is to convey information to the body about day leng.h for a variety of physiolog.c functions. In addition to melatonin’s role as an endog.nous synchronizer, g.owing.evidence sug.ests its anti-oxidative activity as well as its having.a role in modulating.immune responses. At present, a g.owing.interest is focused on the validity of the anti-tumor mechanisms of melatonin.

关键词： Melatonin, circadian rhythm, breast cancer, pineal g.and, melatonin therapy, peripheral org.n functioning

An experimental study of elastic properties of drag.nfly-like flapping.wing. for use in biomimetic micro air vehicles(BMAVs)

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Chinese Journal of Aeronautics 2017年第2期30卷 726-737页

作者： Praveena nair Sivasankaran Thomas Arthur Ward Erfan Salami Rubentheren Viyapuri Christopher J.Fearday Mohd Rafie Johan Department of Mechanical Eng.neering University of Malaya KuaIa Lumpur 50603 Malaysia School of Eng.neering.and Physical Sciences Heriot-Watt University Malaysia Putrajaya 62200 Malaysia Department of Electrical Eng.neering University of Malaya Kuala Lumpur 50603 Malaysia

This article studies the elastic properties of several biomimetic micro air vehicle（BMAV）wing. that are based on a drag.nfly *** are a new class of unmanned micro-sized air vehicles that mimic the flapping.wing.motion of flying.biolog.cal org.nisms（e.g.,insects,birds,and bats）.Three structurally identical wing. were fabricated using.different materials：acrylonitrile butadiene styrene（ABS）,polylactic acid（PLA）,and *** wing.frame structures were fabricated from these materials and then a nanocomposite film was adhered to them which mimics the membrane of an actual *** wing. were then attached to an electromag.etic actuator and passively flapped at frequencies of 10-250 Hz.A three-dimensional hig. frame rate imag.ng.system was used to capture the flapping.motions of these wing. at a resolution of 320 pixels x 240 pixels and 35000 frames per *** maximum bending.ang.e,maximum wing.tip deflection,maximum wing.tip twist ang.e,and wing.tip twist speed of each wing.were measured and compared to each other and the actual drag.nfly *** results show that the ABS wing.has considerable flexibility in the chordwise direction,whereas the PLA and acrylic wing. show better conformity to an actual drag.nfly wing.in the spanwise *** studies have shown that the aerodynamic performance of a BMAV flapping.wing.is enhanced if its chordwise flexibility is increased and its spanwise flexibility is ***,the ABS wing.fabricated using.a 3D printer） shows the most promising.results for future applications.

关键词： ABS Acrylic Biomimetic micro air vehicle Flapping.mechanism PLA Wing.structure

Artificial intellig.nce in endoscopy: More than what meets the eye in screening.colonoscopy and endosonog.aphic evaluation of pancreatic lesions

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Artificial Intellig.nce in g.strointestinal Endoscopy 2022年第3期3卷 16-30页

作者： Harshavardhan Rao B Judy A Trieu Priya nair g.lad g.essel Mukund Venu Rama P Venu Department of g.stroenterolog. Amrita Institute of Medical SciencesKochi 682041KeralaIndia Internal Medicine-g.stroenterolog. Loyola University Medical CenterMaywoodIL 60153United States Center for Cyber Security Systems and Networks Amrita VishwavidyapeethamKollam 690546KeralaIndia

Artificial intellig.nce(AI)-based tools have ushered in a new era of innovation in the field of g.strointestinal(g.)*** vast improvements in endoscopic techniques and equipment,diag.ostic endoscopy remains heavily operator-dependent,in particular,colonoscopy and endoscopic ultrasound(EUS).Recent reports have shown that as much as 25%of colonic adenomas may be missed at *** can result in an increased incidence of interval colon ***,EUS has been shown to have hig. inter-observer variability,overlap in diag.oses with a relatively low specificity for pancreatic *** understanding.of Machine-learning.ML)techniques in AI have evolved over the last decade and its application in AI–based tools for endoscopic detection and diag.osis is being.actively investig.ted at several *** is an aspect of AI that is based on neural networks,and is widely used for imag. classification,object detection,and semantic seg.entation which are key functional aspects of AI-related computer aided diag.ostic *** this review,current status and limitations of ML,specifically for adenoma detection and endosonog.aphic diag.osis of pancreatic lesions,will be summarized from existing.*** will help to better understand its role as viewed throug. the prism of real world application in the field of g. endoscopy.

关键词： Artificial intellig.nce Artificial Machine Colonoscopy Polyp Endosonog.aphy Pancreas

孔结构对纳米浇注的中孔钙钛矿上甲醇氧化反应动力学的影响（英文）

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Chinese Journal of Catalysis 2016年第1期37卷 32-42页

作者： Mahesh M.nair Freddy Kleitz Serg. Kaliag.ine 拉瓦尔大学化学Materiaux Avances研究中心(CERMA) 加拿大魁北克G1V 0A6 拉瓦尔大学化工系加拿大魁北克G1V 0A6

限制工业有毒气体(如挥发性有机化合物)的排放是当今社会主要的挑战之一.因此,迫切需要开发出消除污染物、且不造成二次污染的环境友好技术.其中热燃烧技术比较有效,但通常该过程会采用贵金属催化剂以实现低温高活性,由于贵金属催化剂... 详细信息

限制工业有毒气体(如挥发性有机化合物)的排放是当今社会主要的挑战之一.因此,迫切需要开发出消除污染物、且不造成二次污染的环境友好技术.其中热燃烧技术比较有效,但通常该过程会采用贵金属催化剂以实现低温高活性,由于贵金属催化剂的成本较高,不利于工业应用,因此,人们一直致力于研究和开发新型材料以替代贵金属催化剂.研究发现,在许多部分氧化或完全氧化反应(特别是烃类或挥发性有机物的氧化反应)中,钙钛矿类复合金属氧化物(ABO_3)具有与贵金属类似的催化性能.但是该材料的制备需在高温(>700℃)条件下进行,使得其比表面积(g.很低,因而限制了其应用.可见,欲使该材料在工业上得到广泛应用,必须在制备技术上实现很大的突破,即制得高比表面积的钙钛矿类材料.已有人通过在200℃下焙烧成功地制备了比表面积为100m^2/g.钙钛矿氧化物,但继续提高焙烧温度,所制样品的比表面积下降.在过去20年中,中孔氧化硅及随后众多中孔材料的成功制备,使得合成具有极高比表面积的非硅基材料(如碳,金属氧化物,和碳化物等)成为可能.在这些材料的制备方法中,纳米浇铸法因其特别适用于制备具有高比表面积的单金属或单金属氧化物而备受青睐.采用纳米浇铸法已经成功制得一系列材料,并用于很多催化反应中.但文献报道大多只局限于温度、催化剂组成或比表面积对其活性的影响.为了能将这些材料成功用于工业应用,需要对其表面反应机理和相关反应动力学进行深入的研究.最近,本课题组采用纳米浇铸法制备了高比表面积的中孔钙钛矿类氧化物,并考察了它们的催化性能.结果表明,在各种气相反应中,所制纳米浇注的钙钛矿类氧化物具有比相应体相氧化物更高的催化效率.基于此,本文以在不同温度老化的SBA-15为硬模板,采用纳米浇铸法制备高比表面积的LaMnO_3材料,运用X-射线衍射、N_2吸附-脱附、透射电镜、程序升温还原和O_2-程序升温脱附等方法分析所制材料的晶相、织构、表面和氧化还原等性质,考察了其孔结构参数对其催化甲醇完全氧化反应性能和动力学的影响,以深入理解该类材料的催化性能.结果表明,以35,100,140℃老化制得的SBA-15为模板剂,成功地制得了La在A位,Mn在B位的一系列LaMnO_3材料,它们具有可调控的比表面积(80-190 m^2/g.;同时,材料的比表面积与所用硬模板剂的老化温度存在很好的关联,且比表面积最大的样品具有最高的催化活性.测量了各催化剂在不同空速(19500-78200h^(-1))条件下甲醇氧化反应结果,从而得到了各催化剂的速率常数,发现它们随着催化剂的比表面积而变化.再结合阿伦尼乌斯方程,采用线性回归法测得了所制备的三个催化剂上该方程的指前因子和表观活化能;发现在所考察的反应条件下,所有催化剂上反应的表观活化能较低,且保持不变.另外,指前因子与催化剂比表面积之间存在线性关系,表明尽管各催化剂的比表面积不同,但单位比表面积的甲醇氧化的比活性是相同的.由于在制备过程中很难除去残余的Si物种,因此未来工作中我们将进一步考察残余物种对纳米浇注的钙钛矿类材料性质的影响.

关键词：中孔钙钛矿高比表面积纳米浇注法甲醇氧化反应动力学

Photoanode Activity of ZnO Nanotube Based Dye-Sensitized Solar Cells

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Journal of Materials Science & Technolog. 2011年第11期27卷 961-966页

作者： R. Ranjusha P. Lekha K.R.V. Subramanian V. nair Shantikumar A. Balakrishnan Nano Solar Division Amrita Center for Nanosciences

Vertical ZnO nanotube （ZNT） arrays were synthesized onto an indium doped tin oxide （ITO） g.ass substrate by a simple electrochemical deposition technique followed by a selective etching.process. Scanning.electron microscopy （SEM） showed formation of well-faceted hexag.nal ZNT arrays spreading.uniformly over a larg. area. X-ray diffraction （XRD） of ZNT layer showed substantially hig.er intensity for the （0002） diffraction peak, indicating.that the ZnO crystallites were well alig.ed with their c-axis. Profilometer measurements of the ZNT layer showed an averag. thickness of -7 μm. Diameter size distribution （DSD） analysis showed that ZNTs exhibited a narrow diameter size distribution in the rang. of 65-120 nm and centered at -75 nm. The photoluminescence （PL） spectrum measurement showed violet and blue luminescence peaks that were centered at 410 and 480 nm, respectively, indicating.the presence of internal defects. Ultra-violet （UV） spectroscopy showed major absorbance peak at ,-348 nm, exhibiting.an increase in energ. g.p value of 3.4 eV. By employing.the formed ZNTs as the photo-anode for a dye-sensitized solar cell （DSSC）, a full-sun conversion efficiency of 1.01% was achieved with a fill factor of 54%. Quantum efficiency studies showed the maximum of incident photon-to-electron conversion efficiency in a visible reg.on located at 590-550 nm rang..

关键词： ZnO nanotubes Indium doped tin oxide (ITO) g.ass Photoluminescence spectra Electrochemical deposition Quantum efficiency