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A comprehensive review on phytopharmacological investigations of Acacia auriculiformis ***. ex Benth

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Asian Pacific Journal of Tropical Biomedicine 2019年第1期9卷 1-11页

作者： Naresh kumar Rangra subir Samanta Kishanta kumar Pradhan Department of Pharmaceutical Sciences & Technology Birla Institute of Technology

Acacia auriculiformis ***. ex Benth. is a perennial shrub having a wide range of medicinal potentials and is widely distributed throughout the world. It is being used traditionally to overcome various medical complications like sore eyes, aches, rheumatism, allergy, itching, and rashes. Besides, Acacia auriculiformis has been proven for many pharmacological activities like central nervous system depressant activity, antioxidant, antimicrobial, antimalarial, anti-filarial, cestocidal, antimutagenic, chemopreventive, spermicidal, wound healing, hepatoprotective and antidiabetic activity due to its low toxicity(LD50 = 3 741.7 mg/kg) and high efficacy. In addition, various phytochemical investigations reveal the presence of chief constituents as flavonoids(Auriculoside) and triterpenoid saponin glycosides(acaciasides-acaciaside A & B) in different parts of this plant. Since many years researchers have been carrying out various studies on this medicinal important shrub to elicit the various biological activities. This review attempts to highlight the pharmacognostical, phytochemical and pharmacological observations from 1965 to 2018 retrieved from SciF inder, Scientific journals, books, Google Scholar, and botanical electronic database websites. The various plant extracts evaluated for different pharmacological activities showed significant efficacy. Bioactive phytoconstituents isolated from various parts of the plant are highlighted. Pharmacognostical standardization of the plant done with various standard parameters is also reported. The low toxicity of this plant and the presence of major bioactive phytoconstituents like flavonoids and triterpenoid saponin glycosides are responsible for a therapeutic remedy for various diseases and pharmacological activities respectively. This review provides exhaustive information about the pharmacognostical, phytochemical, and pharmacological investigations of Acacia auriculiformis till date.

关键词： Acacia auriculiformis Pharmacognostical Phytochemical Pharmacological

Synthesis and characterization of ZnO-Al_2O_3 oxides as energetic electro-catalytic material for glucose fuel cell

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燃料化学学报 2015年第8期43卷 1004-1010页

作者： Sujit kumar Guchhait subir Paul Metallurgical and Material Engineering Department Jadavpur University

One of the thrust areas of research is to find an alternative fuel to meet the increasing demand for *** is a good source of alternative fuel for clean energy and is easily available in abundance from both naturally occurring plants and industrial *** oxidation of glucose in fuel cell requires high electro-catalytic surface of the electrode to produce the clean electrical energy w ith minimum energy losses in the *** and Pt based alloys exhibit high electro-catalytic properties but they are *** energy synthesis at economically cheap price,non Pt based inexpensive high electro catalytic material is *** synthesized Zn O-Al2O3composite is found to exhibit high electro-catalytic properties for glucose *** Cyclic Voltammetry and Chronoamperometry curves reflect that the material is very much comparable to Pt as far as the maximum current and the steady state current delivered from the glucose oxidation are *** image confirms the mixed oxide *** images morphology show increased 3D surface areas at higher *** attributed high current delivered from electrochemical oxidation of glucose on this electrode surface.

关键词： glucose energy materials electro-catalyst cyclic voltammetry chronoamperometry polarization

A two-dimensional analytical-model-based comparative threshold performance analysis of SOI-SON MOSFETs

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Journal of Semiconductors 2011年第10期32卷 32-38页

作者： Sanjoy Deb Saptarsi Ghosh N Basanta Singh A K De subir kumar Sarkar Department of Electronics&Telecommunication Engineering Jadavpur University Department of Electronics&Communication Engineering Manipur Institute of Technology Department of Electronics&Communication Engineering National Institute of Technology

A generalized threshold voltage model based on two-dimensional Poisson analysis has been developed for SOI/SON *** short channel field effects,such as fringing fields,junction-induced lateral fields and substrate fields,are carefully investigated,and the related drain-induced barrier-lowering effects are incorporated in the analytical threshold voltage *** analytical model-based simulation,the threshold voltage roll-off and subthreshold slope for both structures are compared for different operational and structural parameter *** of analytical simulation are compared with the results of the ATLAS 2D physics-based simulator for verification of the analytical *** performance of an SON MOSFET is found to be significantly different from a conventional SOI *** short channel effects are found to be reduced in an SON,thereby resulting in a lower threshold voltage roll-off and a smaller subthreshold *** type of analysis is quite useful to figure out the performance improvement of SON over SOI structures for next generation short channel MOS devices.

关键词： silicon-on-insulator silicon-on-nothing Poisson's equation short channel effects threshold voltage roll-off subthreshold slope

The development of Terminalia chebula Retz.(Combretaceae) in clinical research

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Asian Pacific Journal of Tropical Biomedicine 2013年第3期3卷 244-252页

作者： Anwesa Bag subir kumar Bhattacharyya Rabi Ranjan Chattopadhyay Agricultural and Ecological Research Unit Indian Statistical Institute 203

Medicinal plants are part and parcel of human society to combat diseases from the dawn of *** chebula Retz.(***),is called the‘King of Medicine??in Tibet and is always listed at the lop of the list of‘Ayurvedic Materia Medica??because of its extraordinary power of *** whole plant possesses high medicinal value and traditionally used for the treatment of various ailments for human *** of the folklore people used this plant in the treatment of asthma,sore throat,vomiting,hiccough,diarrhea,dysentery,bleeding piles,ulcers,gout,heart and bladder *** plant has been demonstrated to possess multiple pharmacological and medicinal activities,such as antioxidant,antimicrobial,antidiabetic,hepatoprotective,anti-inflammatory,antimutagenic,antiproliferative,radioprotective,cardioprotective,antiarthritic,anticaries,gastrointestinal motility and wound healing *** no systematic updated information on the therapeutic effectiveness of Terminalia chebula,a popular herbal remedy in India and South-East Asia has so far been *** review highlights an updated information particularly on the phytochemistry and various pharmacological and medicinal properties of Terminalia chebula *** some of its isolated compounds,along with their safety *** may provide incentive for proper evaluation of the plant as medicinal agent against the human diseases and also to bridge the lacunae in the existing literature and future scope which may offer immense opportunity for researchers engaged in validation of the traditional claims and development of safe and effective botanical medicine.

关键词： Terminalia chebula Human diseases Medicinal value Bioactive constituents Safety evaluation

Coryphoid palms from the K-Pg boundary of central India and their biogeographical implications:Evidence from megafossil remains

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Plant Diversity 2023年第1期45卷 80-97页

作者： Sanchita kumar Taposhi Hazra Robert A.Spicer Manoshi Hazra Teresa E.V.Spicer subir Bera Mahasin Ali Khan Palaeobotany and Palynology Laboratory Department of BotanySidho-Kanho-Birsha UniversityRanchi RoadPurulia 723104India CAS Key Laboratory of Tropical Forest Ecology Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMengla 666303PR China School of Environment Earth and Ecosystem SciencesThe Open UniversityMilton Keynes MK76AAUK Centre of Advanced Study Department of BotanyUniversity of Calcutta35B.C.RoadKolkata 700019India

Ten palm leaf impressions are documented from the latest Maastrichtian(late Cretaceous) to early Danian(earliest Paleocene) sediments(K-Pg,c.66-64 Ma) of the Mandla Lobe of the Deccan Intertrappean Beds,Madhya Pradesh,central *** palmate leaf shape along with a definite wellpreserved costa support their placement in the subfamily Coryphoideae of the family *** place all recovered palm leaf specimens in the fossil genus Sabalites,report seven species of coryphoid palms and describe two new species namely,Sabalities umariaensis *** Sabalites ghughuaensis *** fossils indicate that coryphoid palms were highly diverse in central India by the latest *** and earlier reported coryphoid palm fossils from the same locality indicate that they experienced a warm and humid tropical environment during the time of *** discoveries confirm the presence of a diversity of Coryphoideae in Gondwana prior to the India-Eurasia collision and provide information about coryphoid biogeographical history over geological *** on megafossil remains,we trace coryphoid palm migration pathways from India to mainland Southeast(SE) Asia and other parts of Asia after the docking of the Indian subcontinent with Eurasia early in the Paleogene.

关键词： Coryphoideae Leaf fossils Late cretaceous-early paleocene Paleobiogeography Paleoclimate Madhya Pradesh

A Brief Study of the Universe

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International Journal of Astronomy and Astrophysics 2013年第2期3卷 137-152页

作者： subir kumar Basu Thakur Sudeshna Mukerji Department of Mathematics Jadavpur University Kolkata India

In the present study, an oscillatory model of the universe is proposed wherein the universe undergoes a sequence of big bang, expansion, contraction, big bang—repeated ad infinitum. The universe comprises of a “World” and an “Antiworld” in both of which matter operates in the positive time zone and antimatter in the negative time zone. Big bang is predicted as the violent encounter between matter and antimatter. It is suggested that antimatter has negative mass and is hugely abundant. It is also shown why it is extremely rare in spite of its abundance. It is predicted that a built in transformation converts matter to antimatter and vice versa. Finally, it is established that symmetry between matter and antimatter in the universe is maintained throughout.

关键词： Cosmology

Greenhouse Gas Emission from Inland Open Water Bodies and Their Estimation Process—An Emerging Issue in the Era of Climate Change

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Agricultural Sciences 2022年第2期13卷 290-306页

作者： Thangjam Nirupada Chanu subir kumar Nag Satish kumar Koushlesh Manoharmayum Shaya Devi Basanta kumar Das ICAR-Central Inland Fisheries Research Institute (CIFRI) Barrackpore India

The persistent rise in concentrations of greenhouse gases (GHGs) in the earth’s atmosphere is responsible for global warming and climate change. Besides the known source of GHGs emissions like energy, industry, and agriculture, intrinsic emissions from natural inland water bodies like wetland, rivers, reservoirs, estuaries, etc. have also been identified as other hotspots of GHGs emission and gaining the attention of the scientific communities in recent times. Inland fisheries in India are threatened by climate changes such as a change in temperature, precipitation, droughts, storm, sea-level rise, saltwater intrusion, floods that affect mostly the production, productivity and ultimately affect the fishers’ livelihood. There are, however, different mitigation and adaptation strategies to cope with the effects of climate change. Carbon sequestration and other related management interventions are one of the options available minimizing GHGs emissions from inland open waters, particularly the wetlands and coastal mangroves which are well known worldwide for their significant role in the storage of carbon. Assessment of C efflux from exposed sediments in dry streams, reservoirs, lakes, rivers, and ponds into the atmosphere can be considered imperative for a better understanding of their role as a C-sink or as a C-source to the atmosphere.

关键词： Greenhouse Gas Inland Open Water Global Warming Potential Carbon-Dioxide Methane Nitrous Oxide

Significant increase in HBV, HCV, HIV and syphilis infections among blood donors in West Bengal, Eastern India 2004-2005: Exploratory screening reveals high frequency of occult HBV infection

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World Journal of Gastroenterology 2007年第27期13卷 3730-3733页

作者： Prasun Bhattacharya Partha kumar Chandra Sibnarayan Datta Arup Banerjee Subhashish Chakraborty Krishnan Rajendran subir kumar Basu Sujit kumar Bhattacharya Runu Chakravarty Institute of Blood Transfusion Medicine and Immunohematology Kolkata India ICMR Virus Unit Kolkata India National Institute of Cholera and Enteric Diseases Kolkata India

AIM: To evaluate the prevalence of markers of hepatitis B virus (HBV) and hepatitis C virus (HCV) and human immunodeficiency virus (HIV) among blood donors in Kolkata, Eastern India for two consecutive years and to conduct a pilot study to explore the presence of HBV DNA among hepatitis B surface antigen (HBsAg) negative but anti-HBc positive blood donors. METHODS: Seroprevalence of HBsAg, anti-HCV and anti-HIV was studied among 113 051 and 106 695 voluntary blood donors screened in 2004 and 2005, respectively. Moreover, a pilot study on 1027 HBsAg negative donors was carried out for evaluating the presence of HBV DNA by PCR on HBsAg negative/anti- HBc positive donors. RESULTS: A statistically significant increase in the prevalence of HBV (1448 vs 1768, P < 0.001), HIV (262 vs 374, P < 0.001), HCV (314 vs 372, P = 0.003) and syphilis (772 vs 853, P = 0.001) infections was noted among blood donors of Kolkata West Bengal in 2005 as compared to 2004. Moreover, the exploratory study on 1027 HBsAg negative donors revealed that 188 (18.3%)of them were anti-HBc positive out of which 21% were positive for HBV DNA. CONCLUSION: The findings of this study underscore the significantly increasing endemicity of hepatitis viruses, syphilis and HIV among the voluntary blood donors of our community. The pilot study indicates a high rate of prevalence of HBV DNA among HBsAg negative/anti-HBc positive donors and thus emphasizes the need for a more sensitive and stringent screening algorithm for blood donations.

关键词： Hepatitis B virus Human immunodeficiency virus Hepatitis C virus Blood donation Occult HBV infection

Improving Energy Efficiency of Tunnel Furnace by Using Heat Optimization Model

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World Journal of Mechanics 2024年第9期14卷 185-198页

作者： Arup Mallick subir Banerjee Ranjay kumar Singh P. N. Shivangi Pinder Singh Mandley Biswajit Ghosh Chaitanya Bhanu Mrityunjay kumar Singh Product Technology Tata Steel Mumbai India LD & Thin Slab Caster Tata Steel Mumbai India

Reheating furnace of an integrated steel plant consumes intensive fuel as input energy to heat up stocks prior to hot rolling process. In current scenario, the elevated cost of productivity due to increasing fuel price is emerging as a key concern for the steel industry. A continuous improvement in reduction of fuel consumption is one of the key objectives for the manufacturing units. Numerous research work is going on worldwide to increase the energy efficiency of reheating furnaces. Computational Fluid Dynamics (CFD) and numerical modelling are mostly being used for predicting thermal and reactive fluid characteristic inside a furnace. However, the said methods are very expensive and require a huge infrastructure to compute the results. In addition, these results are not available on real time basis to take corrective action due to high computational time. In this article, an alternative approach has been adopted where complete heat and mass balance of entire tunnel type reheating furnace has been carried out. This study includes first principle-based model where heat conduction, convection and radiation with combustion reactions of the fuel components have been considered. Based on these theoretical calculations, the model is used to identify heat losses at various locations of the furnace. Moreover, a method to optimize the mixing ratio of air and fuel (mixed gas) along with monitoring of heat recovery from combined recuperator have been covered. Based on the model outcome, a significant improvement in furnace efficiency has been achieved, leading to reduction in fuel consumption in the range of 12%.

关键词： Heat Balance Energy Efficiency Reheating Furnace Fuel Consumption Air-Fuel Ratio