Extended Study of Visible-Light-Induced Photocatalytic [4 + 2] Benzannulation: Synthesis of Polycyclic (Hetero)Aromatics

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>

Lessons from the Economic Crisis : Case Study of Indonesia

Chatterjee, Shiladitya 경희대학교 아태지역연구원 1999 아태연구 Vol.6 No.1

Halacaridae (Acari) from Thailand: One New and Two Known Species of the Genus Copidognathus Trouessart

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.

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>

Structural failure classification for reinforced concrete buildings using trained neural network based multi-objective genetic algorithm

Chatterjee, Sankhadeep,Sarkar, Sarbartha,Hore, Sirshendu,Dey, Nilanjan,Ashour, Amira S.,Shi, Fuqian,Le, Dac-Nhuong Techno-Press 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.63 No.4

Structural design has an imperative role in deciding the failure possibility of a Reinforced Concrete (RC) structure. Recent research works achieved the goal of predicting the structural failure of the RC structure with the assistance of machine learning techniques. Previously, the Artificial Neural Network (ANN) has been trained supported by Particle Swarm Optimization (PSO) to classify RC structures with reasonable accuracy. Though, keeping in mind the sensitivity in predicting the structural failure, more accurate models are still absent in the context of Machine Learning. Since the efficiency of multi-objective optimization over single objective optimization techniques is well established. Thus, the motivation of the current work is to employ a Multi-objective Genetic Algorithm (MOGA) to train the Neural Network (NN) based model. In the present work, the NN has been trained with MOGA to minimize the Root Mean Squared Error (RMSE) and Maximum Error (ME) toward optimizing the weight vector of the NN. The model has been tested by using a dataset consisting of 150 RC structure buildings. The proposed NN-MOGA based model has been compared with Multi-layer perceptron-feed-forward network (MLP-FFN) and NN-PSO based models in terms of several performance metrics. Experimental results suggested that the NN-MOGA has outperformed other existing well known classifiers with a reasonable improvement over them. Meanwhile, the proposed NN-MOGA achieved the superior accuracy of 93.33% and F-measure of 94.44%, which is superior to the other classifiers in the present study.

A comparative study of granular activated carbon and sand as water filtration media with estimation of model parameters

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.

Cancer Registration in India - Current Scenario and Future Perspectives

Chatterjee, Sharmila,Chattopadhyay, Amit,Senapati, Surendra Nath,Samanta, Dipti Rani,Elliott, Leslie,Loomis, Dana,Mery, Lesly,Panigrahi, Pinaki Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.8

Cancer registration, an important component of cancer surveillance, is essential to a unified, scientific and public health approach to cancer prevention and control. India has one of the highest cancer incidence and mortality rates in the world. A good surveillance system in the form of cancer registries is important for planning and evaluating cancer-control activities. Cancer registration in India was initiated in 1964 and expanded since 1982, through initiation of the National Cancer Registry Program (NCRP) by the Indian Council of Medical Research. NCRP currently has twenty-six population based registries and seven hospital based registries. Yet, Indian cancer registries, mostly in urban areas, cover less than 15% of the population. Other potential concerns about some Indian registries include accuracy and detail of information on cancer diagnosis, and timeliness in updating the registry databases. It is also important that necessary data collection related quality assurance measures be undertaken rigorously by the registries to ensure reliable and valid information availability. This paper reviews the current status of cancer registration in India and discusses some of the important pitfalls and issues related to cancer registration. Cancer registration in India should be complemented with a nationwide effort to foster systematic investigations of cancer patterns and trends by states, regions and sub populations and allow a continuous cycle of measurement, communication and action.

HPV and Cervical Cancer Epidemiology - Current Status of HPV Vaccination in India

Chatterjee, Sharmila,Chattopadhyay, Amit,Samanta, Luna,Panigrahi, Pinaki Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.8

Cervical cancer (CaCx) is the second most fatal cancer contributing to 14% of cancers in Indian females, which account for 25.4% and 26.5% of the global burden of CaCx prevalence and mortality, respectively. Persistent infection with high-risk human papilloma virus (HPV- strains 16 and 18) is the most important risk factor for precursors of invasive CaCx. Comprehensive prevention strategies for CaCx should include screening and HPV vaccination. Three screening modalities for CaCx are cytology, visual inspection with acetic acid, and HPV testing. There is no Indian national policy on CaCx prevention, and screening of asymptomatic females against CaCx is practically non-existent. HPV vaccines can make a major breakthrough in the control of CaCx in India which has high disease load and no organized screening program. Despite the Indian Government's effort to introduce HPV vaccination in the National Immunization Program and bring down vaccine cost, challenges to implementing vaccination in India are strong such as: inadequate epidemiological evidence for disease prioritization, duration of vaccine use, parental attitudes, and vaccine acceptance. This paper reviews the current epidemiology of CaCx and HPV in India, and the current status of HPV vaccination in the country. This article stresses the need for more research in the Indian context, to evaluate interventions for CaCx and assess their applicability, success, scalability and sustainability within the constraints of the Indian health care system.

Global metabolomics approach in <i>in vitro</i> and <i>in vivo</i> models reveals hepatic glutathione depletion induced by amorphous silica nanoparticles

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>

Syntheses of Boron Nitride Nanotubes from Borazine and Decaborane Molecular Precursors by Catalytic Chemical Vapor Deposition with a Floating Nickel Catalyst

Chatterjee, Shahana,Kim, Myung Jong,Zakharov, Dmitri N.,Kim, Seung Min,Stach, Eric A.,Maruyama, Benji,Sneddon, Larry G. American Chemical Society 2012 Chemistry of materials Vol.24 No.15

<P>Multi- and double-walled boron nitride nanotubes (BNNTs) have been synthesized with the aid of a floating nickel catalyst via the catalytic chemical vapor deposition (CCVD) of either the amine-borane borazine (B<SUB>3</SUB>N<SUB>3</SUB>H<SUB>6</SUB>) or the polyhedral-borane decaborane (B<SUB>10</SUB>H<SUB>14</SUB>) molecular precursors in ammonia atmospheres. Both sets of BNNTs were crystalline with highly ordered structures. The BNNTs grown at 1200 °C from borazine were mainly double-walled, with lengths up to 0.2 μm and ∼2 nm diameters. The BNNTs grown at 1200–1300 °C from decaborane were double- and multiwalled, with the double-walled nanotubes having ∼2 nm inner diameters and the multiwalled nanotubes (∼10 walls) having ∼4–5 nm inner diameters and ∼12–14 nm outer diameters. BNNTs grown from decaborane at 1300 °C were longer, averaging ∼0.6 μm, whereas those grown at 1200 °C had average lengths of ∼0.2 μm. The BNNTs were characterized using scanning and transmission electron microscopies (SEM and TEM), and electron energy loss spectroscopy (EELS). The floating catalyst method provides a catalytic and potentially scalable route to BNNTs with low defect density from safe and commercially available precursor compounds.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/cmatex/2012/cmatex.2012.24.issue-15/cm3006088/production/images/medium/cm-2012-006088_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/cm3006088'>ACS Electronic Supporting Info</A></P>