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Chemical characteristics of trace metals in PM10 and their concentrated weighted trajectory analysis at Central Delhi,India

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Journal of Environmental Sciences 2017年第5期29卷 184-196页

作者： Subhash Chandra Monika J.Kulshrestha Ruchi singh nahar singh CSIR-National Physical Laboratory New Delhi 110012 India. Academy of Scientific and Innovative Research (AcSIR) CSIR - National Physical Laboratory (CSIR-NPL) Campus New Delhi 110012 India Present address: Shriram Institute for Industrial Research Delhi 110007 India.

Trace metals associated with PM10 aerosols and their variation during day and nighttime as well as during different seasons have been studied for the year 2012. PCA analysis suggested5 PCs,which accounted for 86.8% cumulative variance. PC1 accounted for 30% with a significant loading of metals of anthropogenic origin,while PC2 showed 28% variance with the loading of metals of crustal origin. These trace metals showed seasonal distinct day and night time characteristics. The concentrations of Cu,Pb,and Cd were found to be higher during nighttime in all the seasons. Only Fe was observed with significantly higher mean concentrations during daytime of all seasons except monsoon. The highest mean values of Cu,Cd,Zn,and Pb during post-monsoon might be attributed to winds advection over the regions of waste/biomass burning and industrial activities in Punjab and Haryana ***,concentration weighted trajectory analysis suggested that metals of crustal origin were contributed by long-range transport while metals of anthropogenic and industrial activities were contributed by regional/local source regions.

关键词： Trace metals Potential source regions Backward trajectory Principal component analysis

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Study of cyanide removal from contaminated water using zinc peroxide nanomaterial

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Journal of Environmental Sciences 2017年第5期29卷 76-85页

作者： Himani Uppal S. Swarupa Tripathy Sneha Chawla Bharti Sharma M.K. Dalai S.P. singh Sukhvir singh nahar singh CSIR-National Physical Laboratory New Delhi 110012 India Electronic Science Kurukshetra University Kurukshetra Haryana 136119 India Academy of Scientific and Innovative Research (AcSIR) India

The present study highlights the potential application of zinc peroxide （ZnO2） nanomaterial as an efficient material for the decontamination of cyanide from contaminated water. A process patent for ZnO2 synthesis has been granted in United States of America （US Patent number 8,715,612; May 2014）, South Africa, Bangladesh, and India. The ZnO2 nanomaterial was capped with polyvinylpyrrolidone （PVP） to control the particle size. The PVP capped ZnO2 nanomaterial （PVP-ZnO2） before and after adsorption of cyanide was characterized by scanning electron microscope, transmission electron microscope, X-ray diffractorneter, Fourier transform infrared spectroscopy and time of flight-secondary ion mass spectrom- etry. The remaining concentration of cyanide after adsorption by PVP-ZnO2 was determined using ion chromatograph. The adsorption of cyanide over PVP-ZnO2 was also studied as a function of pH, adsorbent dose, time and concentration of cyanide. The maximum removal of cyanide was observed in pH range 5.8-7.8 within 15 rain. The adsorption data was fitted to Langmuir and Fruendlich isotherm and it has been observed that data follows both the isotherms and also follows second order kinetics.

关键词： Cyanide Zinc peroxide Adsorption Ion chromatograph

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Comparative study of leaching of silver nanoparticles from fabric and effective effluent treatment

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Journal of Environmental Sciences 2012年第5期24卷 852-859页

作者： Aneesh Pasricha Sant Lal Jangra nahar singh Neeraj Dilbaghi K. N. Sood Kanupriya Arora Renu Pasricha Delhi Public School Dwarka New Delh-110078i India Department of Bio & Nano Technology Guru Jambheshwar University of Science & Technology Hisar Haryana-125001 India CSIR-National Physical Laboratory

Nano silver （Agn） is employed as an active antimicrobial agent, but the environmental impact of Agn released from commercial products is unknown. The quantity of nanomaterial released from consumer products during use should be determined to assess the environmental risks of advancement of nanotechnology. This work investigated the amount of silver released from three different types of fabric into water during washing. Three different types of fabric were loaded with chemically synthesized Ag nanoparticles and washed repeatedly under simulated washing conditions. Variable leaching rates among fabric types suggest that the manufacturing process may control the release of silver reaching the waste water treatment plants. In an attempt to recover the Agn for reutilization and to save it from polluting water, the effluents from the wash were efficiently treated with bacterial strains. This treatment was based on biosorption and was very efficient for the elimination of silver nanoparticles in the wash water. The process ensured the recovery of the Agn leached into the effluent for reutilization, thus preventing environmental repercussions.

关键词： silver nanoparticles leaching eco-environment effluent SEM TEM AAS

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Anti-endothelial cell antibody rich sera from rheumatic heart disease patients induces proinflammatory phenotype and methylation alteration in endothelial cells

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Genes & Diseases 2018年第3期5卷 275-289页

作者： Mukul Rastogi Subendu Sarkar Ankita Makol Rana Sandip singh Uma nahar Saikia Dibyajyoti Banerjee Seema Chopra Anuradha Chakraborti Department of Experimental Medicine and Biotechnology Postgraduate Institute of Medical Education and ResearchChandigarh160012India Department of Cardiothoracic and Vascular Surgery Postgraduate Institute of Medical Education and ResearchChandigarh160012India Department of Histopathology Postgraduate Institute of Medical Education and ResearchChandigarh160012India Department of Obstetrics and Gynaecology Postgraduate Institute of Medical Education and ResearchChandigarh160012India

Rheumatic heart disease(RHD)is a major cause of cardiovascular morbidity and mortality in developing nations like *** commonly affects the mitral valve which is lined by a single layer of endothelial cells(ECs).The role of ECs in mitral valve damage during RHD is not well *** here,anti-endothelial cell antibody from RHD patients has been used to stimulate the ECs(HUVECs and HMVECs).ECs proinflammatory phenotype with increased expression of TNFa,IL-6,IL-8,IFNg,IL-1b,ICAM1,VCAM1,E-selectin,laminin B,and vimentin was documented in both *** promoter hypomethylation of various key inflammatory cytokines(TNFa,IL-6,and IL-8),integrin(ICAM1)associated with leukocyte transendothelial migration,and extracellular matrix genes(vimentin,and laminin)were also ***,the in-vitro data was in accordance with ex-vivo observations which correlated significantly with the etiological factors such as smoking,socioeconomic status,and ***,the study sheds light on the role of ECs in RHD which is a step forward in the elucidation of disease pathogenesis.

关键词： Anti-Endothelial cell antibodies DNA methylation Endothelial cells Inflammation Rheumatic heart disease

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A Simple and Efficient Method for Removal of Phenolic Contaminants in Wastewater Using Covalent Immobilized Horseradish Peroxidase

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材料科学与工程（中英文B版） 2017年第1期7卷 27-38页

作者： Rajesh Ahirwar Jai G. Sharma Bhanumati singh Krishan Kumar Pradip nahar Saroj Kumar CSIR-Institute of Genomics and Integrative Biology Delhi 110007 India Academy of Scientific and lnnovative Research CSIR-Institute of Genomics and lntegrative Biology Delhi 110007 India Department of Biotechnology Delhi Technological University Delhi 110042India Department of Biotechnology Bundelkhand University Jhansi UP 284128 India Department of Chemistry Motilal Nehru College University of Delhi Delhi 110021 India Present address. Department of Biochemistry ICMR-National Institute for Research in Environmental Health Kamla Nehru Hospital Building Bhopa1462001 India

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