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Chatterjee, Tanmay,Lee, Da Seul,Cho, Eun Jin American Chemical Society 2017 Journal of organic chemistry Vol.82 No.8
<P>Herein we report an extended study of [4 + 2] benzannulation reactions of 2-(hetero)aryl-substituted,anilines with alkynes by visible light photocatalysis. The method requires the use of BuONO as a diazotizing agent and 0.3 mol % of fac-Ir(ppy)(3) as a photocatalyst at room temperature. The reaction-proceeded in a chemo-and regioselective manner with high functional group tolerance under mild conditions alloWing the preparation of a wide variety of polycyclic (hetero)arornatic compounds, including phenanthrenes, in moderate to high yields. This procedure is amenable to gram-scale synthesis of 9-phenyliphenanthrene.</P>
Chatterjee, Jaideep,A, Shajahan,Pratap, Shailendra,Gupta, Santosh Kumar Techno-Press 2017 Advances in environmental research Vol.6 No.1
The use of Granular Activated Carbon (GAC) and naturally occurring silica (Sand) as filtration media in water and waste water treatment systems is very common. While GAC offers the additional functionality of being an "adsorptive" filter for dissolved organics it is also more expensive. In this paper we present an experimental evaluation of the performance of a bed of GAC for colloid removal and compare the same with that from an equivalent bed of Sand. The experiments are performed in an "intermittent" manner over extended time, to "simulate" performance over the life of the filter bed. The experiments were continued till a significant drop in water flow rate through the bed was observed. A novel "deposition" and "detachment" rate based transient mathematical model is developed. It is observed that the data from the experiments can be explained by the above model, for different aqueous phase electrolyte concentrations. The model "parameters", namely the "deposition" and "detachment" rates are evaluated for the 2 filter media studied. The model suggests that the significantly better performance of GAC in colloid filtration is probably due to significantly lower detachment of colloids from the same. While the "deposition" rates are higher for GAC, the "detachment" rates are significantly lower, which makes GAC more effective than sand for colloid removal by over an order of magnitude.
Synthesis of Substituted Oxazoles by Visible-Light Photocatalysis
Chatterjee, Tanmay,Cho, Ji Young,Cho, Eun Jin American Chemical Society etc. 2016 Journal of organic chemistry Vol.81 No.16
<P>A simple and practical method for the synthesis of substituted oxazoles has been developed using readily available alpha-bromoketones and benzylamines by visible-light photocatalysis at room temperature. The process, which requires 1 mol % of [Ru(bpy)(3)]Cl-2 photocatalyst with K3PO4 and CCl3Br, is effective for accessing a variety of valuable oxazole compounds. The synthetic utility of our protocol was also demonstrated by preparing a natural prochict, texaline.</P>
Chatterjee, Tapas,Chang, Cheon-Young The Korean Society for Integrative Biology 2002 Korean journal of biological sciences Vol.6 No.3
Three halacarid species belonging to the genus Copidognathus are recorded from the shallow subtidal sands at Ko Taenae Islet (sand dune) off Ko Pha-Ngan Island, Thailand: Copidognathus thailandicus n. sp., C. euryalus Bartsch, 1997 and C. orarius Otto, 2001. Copidognathus thailandicus n. sp. comes close with C. cribrosoma (Police, 1909) and C. cribellus Bartsch, 1993 due to dorsal plates completely covered with rosette pores. Dissimilarities among them are discussed. Copidognathus euryalus and C. orarius are recorded hove for the first time from Thailand and away from its type locality. The present paper is also the first contribution on the taxonomy of Halacaridae (Acari) from Thailand.
AMATURE ASTRONOMY AND ASTRONOMY EDUCATION IN INDIA
CHATTERJEE, SOMENATH The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
In India, astronomy has been studied from the beginning of civilization. The word amateur means involvement in work for pleasure rather than as a profesion. So, amateur astronomers, in many places, prefer to be called non-professional astronomers. In India, the history of amateur astronomy is quite bright. From the Puranic age astronomy was studied for peoples' daily life. In Ramayana, Mahabharata, there is a lot of evidence of astronomical knowledge. Veda is the main source for studying the history of Indian astronomy. Today astronomy education, consciousness of astronomy education, sky observation, etc. are dependent on non-professional astronomers. Vigyan Prasar, an Indian Govt. organization, is trying to popularize astronomy throughout the country.
Chatterjee, Nivedita,Kim, Youngho,Yang, Jisu,Roca, Carlos P.,Joo, Sang-Woo,Choi, Jinhee Informa UK (TaylorFrancis) 2017 Nanotoxicology Vol.11 No.1
<P>The potential hazards of graphene nanomaterials were investigated by exposing the nematode Caenorhabditis elegans to graphene oxide (GO) and reduced graphene oxide (rGO). The underlying mechanisms of the nano-bio interaction were addressed with an integrated systems toxicology approach using global transcriptomics, network-based pathway analysis, and experimental validation of the in-silico-derived hypotheses. Graphene oxide was found to reduce the worms' reproductive health to a greater degree than rGO, but it did not affect survival (24h endpoint). Comparative analysis of GO vs. rGO effects found that the wingless-type MMTV integration site family (Wnt) pathway and the mitogen-activated protein kinase (MAPK) pathway were evoked in GO- but not in rGO-exposed worms. We therefore hypothesized that crosstalk between the Wnt and MAPK pathways is responsible for C. elegans' reproductive sensitivity to GO exposure. By targeting the individual components of the Wnt-MAPK crosstalk pathway (with qPCR gene expression and mutant reproduction analysis), we found a signaling cascade of MOM-2 -> MOM-5 -> MOM-4 -> LIT-1 -> POP-1 -> EGL-5. Specifically, the activation of POP-1 (the TCF protein homolog) and subsequent repression of the Wnt/beta-catenin target gene (EGL-5), analyzed with target-gene-specific RNAi in POP-1 mutant [pop-1(q645)] worms, were the central mechanisms of reduced reproductive potential in the worms exposed to GO. Our results highlight the distinct biological and molecular mechanisms of GO and rGO exposure and the role of Wnt-MAPK pathway crosstalk in regulating GO-induced reproductive failure in in vivo systems, and they will contribute to the development of efficient and innocuous graphene applications as well to improvements in mechanism-based risk assessment.</P>
AN IMPROVED ADDITIVE MODEL FOR RELIABILITY ANALYSIS OF SOFTWARE WITH MODULAR STRUCTURE
Chatterjee, S.,Nigam, S.,Singh, J.B.,Upadhyaya, L.N. The Korean Society for Computational and Applied M 2012 Journal of applied mathematics & informatics Vol.30 No.3
Most of the software reliability models are based on black box approach and these models consider the entire software system as a single unit. Present day software development process has changed a lot. In present scenario these models may not give better results. To overcome this problem an improved additive model has been proposed in this paper, to estimate the reliability of software with modular structure. Also the concept of imperfect debugging has been also considered. A maximum likelihood estimation technique has been used for estimating the model parameters. Comparison has been made with an existing model. ${\chi}^2$ goodness of fit has been used for model fitting. The proposed model has been validated using real data.
Chatterjee, Nivedita,Jeong, Jaeseong,Yoon, Dahye,Kim, Suhkmann,Choi, Jinhee Elsevier 2018 Chemico-biological interactions Vol.293 No.-
<P><B>Abstract</B></P> <P>The present study aimed to investigate the mechanisms involved in amorphous silica nanoparticles (aSiNPs)-mediated hepatotoxicity through the evaluation of changes in global metabolomics in <I>in vitro</I> and <I>in vivo</I> systems. <SUP>1</SUP>H NMR-based non-targeted global metabolomics and biochemical approaches were conducted in an aSiNPs-treated human hepatoma cell line (HepG2) and in ICR mice liver. The non-targeted NMR-based metabolomic analysis, followed by pathway analysis, revealed the perturbation of glutathione metabolism and the depletion of the glutathione pool after aSiNPs treatment in both <I>in vitro</I> (HepG2 cells) and <I>in vivo</I> systems. The total glutathione level, glutathione-S-transferase enzyme activity, and antioxidant gene expression strongly corroborated the metabolomic analysis results. The <I>in vitro</I> results were further supported by the <I>in vivo</I> data, specifically for metabolites profiling (Pearson Correlation coefficient is 0.462 (p = 0.026)). Furthermore, the depletion of glutathione, the formation of NADPH oxidase-mediated reactive oxygen species, and oxidative stress were evident in aSiNPs-treated HepG2 cells. Overall, the suppression of glutathione metabolism and oxidative stress are among the principal causes of aSiNPs-mediated hepatotoxicity.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Amorphous Silica nanoparticles (aSiNPs) exposure to HepG2 cells and ICR mice liver. </LI> <LI> Global metabolomics (NMR based) and biochemical assays reveal glutathione depletion. </LI> <LI> NADPH oxidase dependent ROS formation in aSiNPs exposed HepG2 cells. </LI> <LI> Alteration in antioxidative gene expression and GST enzyme activity. </LI> <LI> Conserved mechanisms of aSiNPs toxicity between <I>in vitro</I> and <I>in vivo</I> models. </LI> </UL> </P>