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New Greener Alternative for Biocondensation of Aldehydes and Indoles Using Lemon Juice: Formation of Bis-, Tris-, and Tetraindoles

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International Journal of Organic Chemistry 2013年第2期3卷 136-142页

作者： Rammohan pal Department of Chemistry Acharya Jagadish Chandra Bose College Kolkata India

This work presents a new greener alternative for biocondensation of aldehydes and indoles for the synthesis of bis- and tris(indolyl)methanes catalyzed by lemon juice (Citrus limon) in good yields under ultrasound irradiation in aqueous ethanol. Various substituted aldehydes with indoles under this reaction condition are elucidated. Also, tetraindolyl compounds were prepared using terephthaldialdehyde by following the same protocol. This method is an environmentally benign, efficient reaction, which requires shorter reaction time and simple experimental and work-up procedures.

关键词： Citrus limon Juice Biocondensation Aldehydes Indoles Aqueous Ethanol Sonication Bis- Tris- Tetraindoles

Imidacloprid in processed tea and tea liquor

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2006年第8期7卷 619-622页

作者： SANYAL N. HAZRA D. pal R. SOMCHAUDHURY A.K. CHOWDHURY A. Department of Agricultural Chemicals Bidhan Chandra Krishi ViswavidyalayaMohanpur 741 252 India Department of Agricultural Chemicals Bidhan Chandra Krishi ViswavidyalayaMohanpur 741 252India Institute of Environmental Studies and Wetland Management Salt Lake CityKolkata 700 098India Department of Entomology Bidhan Chandra Krishi ViswavidyalayaMohanpur 741 252 India Department of Agricultural Chemistry and Soil Science Calcutta University Kolkata 700 019India

Imidacloprid is a newly introduced broad-spectrum chloronicotinyl insecticide and will find its way in agricultural production, particularly in Asia. However, information on the fate of imidacloprid in crop plants is lacking. The degradation of imidaclopnd in processed CTC tea and tea liquor was investigated in the present study in which imidacloprid was applied at recommended application rate （30.0 g a.i./ha） and twice the recommended application rate （60.0 g a.i./ha） for three consecutive seasons. Imidacloprid was rapidly dissipated in processed tea following first order reaction kinetics at all application rates and had half-lives of 0.9 1-1.16 d with the residue in tea liquor found to be below detectable limit on 3rd day samples. The study revealed that imidacloprid is safe for human consumption and will not pose any residual toxicity problem.

关键词： Imidacloprid Processed tea Tea liquor Residue Dissipation

Visible Light Induced Knoevenagel Condensation Catalyzed by Starfruit Juice of <i>Averrhoa carambola</i>

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International Journal of Organic Chemistry 2014年第2期4卷 106-115页

作者： Rammohan pal Taradas Sarkar Department of Chemistry Acharya Jagadish Chandra Bose College Kolkata India

Aqueous starfruit juice catalyzed a simple and efficient Knoevenagel condensation of aromatic aldehydes with malononitrile has been developed under visible light. Products were obtained in yields up to 98% after short reaction times and they were isolated by simple filtration in pure crystallization states. The method is green and economically viable. A plausible mechanism for photochemical Knoevenagel condensation reaction catalyzed by starfruit juice was also predicted.

关键词： Knoevenagel Condensation Aqueous Starfruit Juice Aldehydes Malononitrile Visible Light

An Effective Mannosylated Chitosan Nanoparticle DNA Vaccine for FMD Virus

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Virologica Sinica 2012年第6期27卷 373-376页

作者： Raj Kishore Nanda Bedaso Mammo Edao Irshad Ahmad Hajam Shanmugam chandra Sekar Kondabattula Ganesh Veerakyathappa Bhanuprakash subodh Kishore FMD Quality Control and Quality Assurance Laboratory Indian Veterinary Research InstituteH A FarmHebbalBangalore 560024KarnatakaIndia

Dear Editor,We are reporting you an effective DNA vaccine for FMD virus,and it was prepared using mannosylated chitosan (MC) nanoparticles to form the FMDVpVAC-VP1-OmpA complex *** particles were characterized for their physical properties like morphology,size and charge prior evaluating the actual vaccine delivery effect of *** immunological evaluation indicated that the 20

关键词：复合纳米粒子猪口蹄疫病毒 DNA疫苗壳聚糖糖化 ELISA法物理性质中和抗体

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轮胎彩色胎面胶料的磨耗行为(英文)

轮胎彩色胎面胶料的磨耗行为(英文)

Optical and Physical Analysis of Nd3. Doped Borosilicate Glasses

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作者： Suprakash Nayek Anil K.Bhowmick Samir K.pal Arup K. chandra Rubber Technology Center Indian Institute of TechnologyKharagpur-721302India Rubber Technology Center Indian Institute of TechnologyKharagpur-721302India Mining Engineering Department Indian Institute of TechnologyKharagpur-721302India Apollo Tyres Limited Boroda-390006India

研究了不同法向负荷下轮胎彩色胎面胶在各种岩石路面上的磨耗。彩色胎面胶是用NR,SBR和白炭黑制作的。岩石具有不同硬度和化学成分。磨耗V随法向负荷N和摩擦功Fw增大而增大,其关系用下式表示:V=βNα和V=kFwn式中,α,β,k和n为常数,且...

研究了不同法向负荷下轮胎彩色胎面胶在各种岩石路面上的磨耗。彩色胎面胶是用NR,SBR和白炭黑制作的。岩石具有不同硬度和化学成分。磨耗V随法向负荷N和摩擦功Fw增大而增大,其关系用下式表示:V=βNα和V=kFwn式中,α,β,k和n为常数,且取决于岩石和胶料的性质。在白炭黑填充量达到一定限度（NR胶料60份,SBR胶料70份）前,磨耗速率下降,超过此限度则增大。在摩擦力和动态磨擦系数研究中也观察到类似趋势。在低法向负荷下,SBR胶料的磨耗速率比NR填充胶料低得多。磨耗率随法向负荷增大而增大。在相同试验条件下,SBR胶料的温升低于NR填充胶料,而且在一定时间范围内,温升随时间延长而增高。在硬岩石上温升较大,填充胶料的温升也较大。所有试验结果都借助动态摩擦系数、摩擦功以及磨耗引起的结构变化来解释,在同等条件下,SBR胶料的动态摩擦系数低于NR胶料,动态摩擦系数随温度升高而减小。特定橡胶胶料的动态摩擦系数取决于岩石的性质。在较低法向力下的磨耗过程中,NR填充胶料的质量增大,这可能是机械化学反应造成的。但是,SBR胶料的质量增大低于NR胶料。NR胶料的动态摩擦系数受到在胶料表面形成的焦油状油层的影响。NR胶料的碎渣是油状和结构化的,而SBR胶料的碎渣是粒状的。与NR胶料相比,SBR填充胶料磨耗表面具有比较突出的棱脊。

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材料科学与工程（中英文B版） 2015年第11期5卷 406-417页

作者： Yogesh Kumar Sharma Priyanka Goyal Sudha pal Umesh chandra Bind Department of Physics S.B.S. Govt. P. G. College Rudrapur (Kumaun University Nainital)-263153 Uttarakhand India Centre of Nano Technology Indian Institute of Technology Roorkee India

Kinetics of the Oxidation of Hydrogen Sulfide by Atmospheric Oxygen in an Aqueous Medium

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Journal of Atmospheric Science Research 2021年第3期4卷 46-59页

作者： Deepak Singh Rathore Vimlesh Kumar Meena chandra pal Singh Chandel Krishna Swarup Gupta Atmospheric Chemistry Laboratory Department of ChemistryUniversity of RajasthanJaipur302004India

Hydrogen sulfide is an important acid rain precursor and this led us to investigate the kinetics of its oxidation in aqueous phase by atmospheric *** kinetics was followed by measuring the depletion of oxygen in a *** reaction was studied under pseudo order conditions with[H2S]in *** kinetics followed the rate law:-d[O_(2)]/dt=k[S][O_(2)]_(t)(A)Where[S]represents the total concentration of hydrogen sulfide,[O_(2)]_(t)is the concentration of oxygen at time t and k is the second order rate *** equilibria(B-C)govern the dissolution of H_(2)S;the sulfide ion in water forms different species:H_(2)S K1→←HS^(-)+H_(+)(B)HS^(-)K2→←S^(2-)+H^(+)(C)Where K_(1)and K_(2)are first and second dissociation constants of H_(2)***,H_(2)S is present as undissociated H_(2)S,HS^(-)and S^(2-)ions,nature of[H^(+)]dependence of reaction rate required only HS^(-)to be reactive and *** rate law(A)on including[H^(+)]dependence became Equation(D).-d[O_(2)]/dt=k_(1)K_(1)[H^(+)][S][O_(2)]_(t)/([H^(+)]^(2)+K_(1)[H^(+)]+K_(1)K_(2))(D)Our results indicate anthropogenic VOCs such as acetanilide,benzene,ethanol,aniline,toluene,benzamide,o-xylene,m-xylene,p-xylene and anisole to have no significant effect on the reaction rate and any observed small effect is within the uncertainty of the rate measurements.

关键词： Hydrogen sulfide Oxygen Oxidation Kinetics Effect of organics

加尔各答市政固体垃圾中杀虫剂的转化:堆肥的效果

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AMBIO－人类环境杂志 2005年第B12期34卷 641-642页

作者： R.pal P.Bhattacharyya K.Chakrabarti A.Chakraborty 王胜 Department of Agricultural Chemistry & soil Science Calcutta University West Bengal State Council of Science & Technology B.Department of Agronomy Bidhan chandra Krishi Viswavidyalaya

引言人类活动所产生的固体垃圾已经成为引起大范围污染并对人类健康造成许多威胁的主要问题之一[1].加尔各答市每天约产生3500Mg市政固体垃圾(MSW)[2].MSW堆肥正被越来越多地认为是全世界垃圾处理的一种可行且经济的方法,它比其它垃圾... 详细信息

引言人类活动所产生的固体垃圾已经成为引起大范围污染并对人类健康造成许多威胁的主要问题之一[1].加尔各答市每天约产生3500Mg市政固体垃圾(MSW)[2].MSW堆肥正被越来越多地认为是全世界垃圾处理的一种可行且经济的方法,它比其它垃圾处理方式所造成的环境污染更小.但是,人们仍对堆肥中所含有的有机污染物所产生的潜在健康危险存在顾虑[3].有毒有机化合物对环境的潜在影响是这些化合物浓度水平的作用,其中有许多不仅对人类和动物有毒,而且对植物也有毒.

关键词：固体垃圾堆肥市政杀虫剂垃圾处理方式有机污染物有机化合物转化人类健康人类活动