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In-Situ Hydrothermal Synthesis of Bi–Bi2O2CO3 Heterojunction Photocatalyst with Enhanced Visible Light Photocatalytic Activity

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Nano-Micro Letters 2017年第2期9卷 58-67页

作者： Prasenjit Kar tuhin kumar maji Ramesh Nandi Peter Lemmens Samir kumar Pal Department of Chemical Biological and Macromolecular Sciences S.N.Bose National Centre for Basic SciencesBlock JDSector ⅢSaltLakeKolkata 700106India Institute for Condensed Matter Physics TU BraunschweigMendelssohnstraße 338106 BrunswickGermany Laboratory for Emerging Nanometrology TU BraunschweigBrunswickGermany

Bismuth containing nanomaterials recently received increasing attention with respect to environmental applications because of their low cost, high stability and nontoxicity. In this work, Bi–Bi_2O_2CO_3 heterojunctions were fabricated by in-situ decoration of Bi nanoparticles on Bi_2O_2CO_3 nanosheets via a simple hydrothermal synthesis approach. X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM) and high-resolution TEM(HRTEM) were used to confirm the morphology of the nanosheet-like heterostructure of the Bi–Bi_2O_2CO_3 composite. Detailed ultrafast electronic spectroscopy reveals that the in-situ decoration of Bi nanoparticles on Bi_2O_2CO_3 nanosheets exhibit a dramatically enhanced electron-hole pair separation rate, which results in an extraordinarily high photocatalytic activity for the degradation of a model organic dye, methylene blue(MB) under visible light illumination. Cycling experiments revealed a good photochemical stability of the Bi–Bi_2O_2CO_3 heterojunction under repeated irradiation. Photocurrent measurements further indicated that the heterojunction incredibly enhanced the charge generation and suppressed the charge recombination of photogenerated electron-hole pairs.

关键词： Bi nanoparticles Bi–Bi2O2CO3 nanosheets Heterojunction Hydrothermal method Charge separation Visible light photocatalytic activity

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人胎盘提取液的抗炎和抗血小板聚集作用

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Acta Pharmacologica Sinica 2003年第2期24卷 187-192页

作者： SUR Tapas kumar BISWAS tuhin Kanti ALI Liaquat MUKHERJEE Biswapati SN Pradhan Centre for Neurosciences Dr BC Roy Postgraduate Institute of Basic Medical Sciences 244B Acharya J C Bose Road Calcutta 700020 India Research Division BIRDEM 122 Kazi Nazrul Islam Avenue Dhaka 1000 Bangladesh

AIM: To find the anti-inflammatory and anti-platelet aggregatory activity of human placental extract （HPE, Placentrex）.METHODS: The HPE was studied for anti-inflammatory effect in Wistar rats on carrageenin, serotonin （5-HT）,and prostaglandin E1（PGE1） induced edema in acute model and cotton pellet induced granuloma on sub-acute model. Anti-platelet aggregation was studied against protection of adinosine diphosphate （ADP）-induced aggregation of human platelet through in vitro study. RESULTS: HPE showed positive results both in acute and sub-acute models of inflammation. Highly significant （P<0.01） results were obtained against 5-HT induced acute inflammation and cotton pellet induced sub-acute inflammation in comparison with standard （diclofenac sodium） and control（normal saline） drugs. The anti-inflammatory property of HPE in animal model was well supported with clinical study of platelet aggregation. There was highly significant （P<0.01） inhibition of platelet aggregation with HPE at different doses against ADP. CONCLUSION: Our data suggest that human placental extract may be useful in suppressing inflammation and platelet aggregation.

关键词：胎盘提取物炎症角叉菜胶血小板聚集腺苷二磷酸

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Pollen Morphology of Indian Species of Saraca L.(Leguminosae)-A Threatened and Legendary Medicinal Tree

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Phyton-International Journal of Experimental Botany 2019年第3期88卷 295-315页

作者： Sujit Sil Tanmoy Mallick tuhin Pal Animesh Mondal Kalyan kumar De Asok Ghosh Postgraduate Department of Botany Hooghly Muhammad Mohsin College(Estd.1836)Chinsurah712101HooghlyWest BengalIndia UGC-CAS Department of Botany Taxonomy of Angiosperms and Biosystematics LaboratoryUniversity of BurdwanGolapbagBurdwan713104West BengalIndia

The genus Saraca L.(Leguminosae)is a universal panacea in herbal *** present study investigates the comparative pollen morphology of four species of Saraca ***(Roxb.)de Wilde,***(Jack)Miq.,*** L.,and *** Cantley ex Prain growing in India to reveal differences of their pollen structures to aid taxonomic and evolutionary *** detailed morphology and surface structure of pollen grains were studied and described using light microscopy and scanning electron *** pollen grains of Saraca showed isopolar,para-syncolporate,tricolporate,with radially symmetric,prolate and prolate-spheroidal *** surface of pollen of *** is rugulate with large lirae but in ***,the surface is micro-rugulate to vermiculate with relatively thin lirae and that of *** is indistinct as the psilate surface with a frequent protuberance and fewer perforations were observed along with the gemmae like *** ornamentation helped to separate *** and *** thickness varies from 3-4μ*** of protuberance and exine thickness varies among individuals of the species spread over different *** work also provides a unique palynological identity and interrelationship of these four species based on cluster analysis taking 23 pollen characters with the help of statistical method like the plotting of ternary *** plots also helped to calculate the level of plasticity of each character in the intra-and inter-specific level.

关键词： Cluster analysis palynology SEM study surface ornamentation ternary graph

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