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Chinese Science Bulletin 1994年第19期39卷 1638-1643页

作者：周永章涂光炽 Edward H. Chown Jayanta guha 卢焕章 Institute of Geochemistry Guangzhou Branch Academia Sinica Guangzhou 510640 PRC Universite du Quebec a Chicoutimi Canada G7H 2B1

Hydrothermal wall-rock alteration is the interaction of hydrothermal fluids with the wall rock, causing changes or redistribution of chemical compositions of initial wall *** study of hydrothermal alteration may enric... 详细信息

关键词： constant sum constraint conserved element balance estimation of mass element migration.

Biophysical mechanism-mediated time-dependent effect on sperm of human and monkey vas implanted polyelectrolyte contraceptive

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Asian Journal of Andrology 2007年第2期9卷 221-227页

作者： Sujoy K. guha School of Medical Science and Technology Indian Institute of Technology and National Institute of Medical Science and Technology Kharagpur 721302 India

Aim： To determine the short and long-term morphological effects on sperm as induced by intra-vas alteration of pH and electrical charge. Methods： Desired biophysical influences were obtained by injection of reversible inhibition of sperm under guidance （RISUG） into the lumen of the vas deferens of human subjects and the monkey. RISUG is a polyelectrolyte hydrogel complex of styrene maleic anhydride （SMA） and dimethyl sulfoxide （DMSO） which generates an electrostatic charge and also lowers in a near space of pH domain. The morphology of sperm was examined by light microscopy, scanning and transmission electron microscopy. Human study enabled semen collection by masturbation as early as 3 h after injection and studies extended up to 6 months, in the monkey, on vas excision after RISUG implantation, sperm characteristics were examined in serial sections. Results： Semenology in clinical studies and histological data of the monkey showed a time-sequenced sperm plasma membrane, tail mitochondria and nuclear decondensation alterations in sperm structural components, which beared marked similarity to changes in the sperm head and tail during capacitation and entry into the ovum. Conclusion： The findings provide a means of causing such changes in the sperm that inhibit the fertilizing ability before the nucleus is affected. Therefore achieving non-obstructive vas-based contraception, without genotoxic or teratogenic effects caused by infertile sperm passing into the semen, is feasible.

关键词： reversible inhibition of sperm under guidance vas deferens electrical charge sperm electron microscopy acrosome mitochondria chromatin decondensation

The Existence of H_2S in the Hydrothermal Fluid in Baoban Gold Field,China and Its Implication

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Chinese Science Bulletin 1994年第3期39卷 229-232页

作者：肖志峰欧阳自远卢焕章 Janyata guha Institute of Geochemistry Academia Sinica Guiyang 550002 PRC Universite du Quebec a Chicoutimi Chicoutimi PQ Canada Université

In the research on the gold deposits,it has been proposed that gold istransported as sulfide hydrogen *** from the analysis of the compositionof the fluid inclusions in gold-quartz veins,only SO42- exists and no other sulfur ionshave been *** may be ascribed to the limitations of the composition *** using probe mass spectrometry,gas H2S has been found in the fluid in-clusions in gold deposit。but its meaning has been *** China,it is thefirst time to use probe mass spectrometry to analyse the fluid inclusions composition.

关键词： H2S fluid inclusions gold deposit Hainan.

Therapeutic Potentials of Oroxylum indicum Bark Extracts

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中国天然药物 2010年第2期8卷 121-126页

作者： R.Ashok Kumar V.Rajkumar Gunjan guha Lazar Mathew School of Bio Sciences and Technology VIT UniversityVellore-632014.Tamil NaduIndia

AIM:Diverse therapeutic potentials of methanolic and aqueous extracts of Oroxylum indicum(L.)***,includ- ing antioxidant property,cytotoxicity and protection against oxidative DNA damage were investigated in this ***:Total phenolics in the extracts were determined by spectrophotometric *** reducing antioxidant property(FRAP),free radical (DPPH·and ·OH)scavenging activities,as well as inhibitory effect on lipid peroxidation have been *** of the extracts was investigated by XTT assay in MDA-MB-435S and Hep3B cell *** of DNA by the extracts against oxidative damage by UV-photolysis of H2O2 was ***:Total phenolic content and inhibition of lipid peroxidation in both extracts were found to be ***,both extracts exhibited considerable free radical scavenging and ferric reducing abili- *** extracts demonstrated extensive cytotoxicity in both tested cell lines,with the methanolic extract showing greater cytotoxic *** extracts exhibited moderate levels of DNA protection against oxidative *** phenolic content was noted to have significant positive correlations with free radical scavenging and reducing power,as well as lipid peroxidation inhibition(P<0.05). CONCLUSIONS:These results indicate that *** bark extracts possess diverse biological activities in vitro and could render itself as a prospective candidate for drug research.

关键词：激进分子净化方法减轻体重法氧化特性

On a Class of Solitary Wave Solutions of Atmospheric Nonlinear Equations

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Advances in Atmospheric Sciences 1991年第3期8卷 357-362页

作者： R. Dhar C. guha-Roy D. K. Sinha Permanent address: S. A. Jaipuria College 10 Raja Nabakrishna Street Calcutta-700005 INDIADepartment of Mathematics Jadavpur University Calcutta-700032 IndiaCentre for atmospheric Sciences University of Calcutta 92 A. P. C. Road Calcutta-700009 INDIA

In this paper, an attempt is made to study some interesting results of the coupled nonlinear equations in the atmosphere. By introducing a phase angle function ζ, it is shown that the atmospheric equations in the pre... 详细信息

关键词： On a Class of Solitary Wave Solutions of Atmospheric Nonlinear Equations

Development and in vitro/in vivo evaluation of controlled release provesicles of a nateglinide–maltodextrin complex

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Acta Pharmaceutica Sinica B 2014年第5期4卷 408-416页

作者： Ranjan Ku.Sahoo Nikhil Biswas Arijit guha Nityananda Sahoo Ketousetuo Kuotsu Department of Pharmaceutical Technology Jadavpur UniversityKolkata 700032India

The aim of this study was to characterize the provesicle formulation of nateglinide(NTG)to facilitate the development of a novel controlled release system of NTG with improved efficacy and oral bioavailability compared to the currently marketed NTG formulation(Glinate^(™)60).NTG provesicles were prepared by a slurry method using the non-ionic surfactant,Span 60(SP),and cholesterol(CH)as vesicle forming agents and maltodextrin as a coated *** niosomes with narrow size distribution were shown to be successfully prepared by means of dynamic laser scattering(DLS)and field emission scanning electron microscopy(FESEM).The absence of drug-excipient interactions was confirmed by Fourier transform infrared spectroscopy(FT-IR),differential scanning calorimetry(DSC)and X-ray diffraction(XRD)*** vitro release of NTG in different dissolution media was improved compared to pure drug.A goat intestinal permeation study revealed that the provesicular formulation(F4)with an SP:CH ratio of 5:5 gave higher cumulative amount of drug permeated at 48 h compared to Glinate^(™)60 and control.A pharmacodynamic study in streptozotocin-induced diabetic rats confirmed that formulation F4 significantly(P<0.05)reduced blood glucose levels in comparison to Glinate *** the results show that controlled release NTG provesicles offer a useful and promising oral delivery system for the treatment of type Ⅱ diabetes.

关键词： Provesicles Niosomes Maltodextrin Nateglinide In vitro release Goat intestinal permeation Hypoglycemic

Generation of Quantum Vector States Using the Exchange Interaction

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Journal of Applied Mathematics and Physics 2019年第12期7卷 3116-3131页

作者： Mrittunjoy guha Majumdar University of Cambridge Cambridge UK

In this paper, I study the invariant subspaces of quantum states under SWAPα gates arising from the exchange interaction and their use in quantum computation. I investigate the generation and characterization of invariant-subspace vector-states that arise from such gates. I also state a condition for the locus of states that are accessible using the SWAPα gates, given an initial input state.

关键词： Quantum Entanglement Vector States Exchange Interaction

加拿大Abitibi绿岩带Donalda金矿近水平含金石英脉的显微构造分析及其对成矿流体动力学的指示

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地学前缘 2011年第5期18卷 43-54页

作者：池国祥 Jayanta guha 加拿大里贾纳大学地质系萨斯喀彻里贾纳S4S 0A2 加拿大魁北克大学希库蒂米分校魁北克希库蒂米

位于加拿大Abitibi绿岩带南部的Donalda金矿床主要由近水平的、与剪切带近垂直的含金石英脉组成,矿脉厚度0.3～0.5m,含大量与脉壁平行的条带,指示多期次裂隙扩张和矿物沉淀。原生石英c-轴方位测量显示石英生长方向垂直于脉壁,指示断裂... 详细信息

位于加拿大Abitibi绿岩带南部的Donalda金矿床主要由近水平的、与剪切带近垂直的含金石英脉组成,矿脉厚度0.3～0.5m,含大量与脉壁平行的条带,指示多期次裂隙扩张和矿物沉淀。原生石英c-轴方位测量显示石英生长方向垂直于脉壁,指示断裂属张性,矿物沉淀属空间充填。显微裂隙、细脉及流体包裹体面(FIPs)的方位测量指示原生矿物受到了近直立的最大主压应力(σ1)作用,与区域性的、近水平的南北向挤压应力不符。这一矛盾现象可用流体压力在超静岩和静水压力之间周期性变化及近水平断裂的周期性张开与闭合来解释。当流体压力大于静岩压力时,断裂张开,原生矿物沉淀,而当流体压力减小时,断裂上盘往下垮,两盘突出的矿物碰撞、碾压形成与脉壁平行的变形条带。由于断裂两盘岩石不是沿整条断裂都互相接触,两盘相顶部分承受的垂直应力大于水平方向的挤压应力,这就解释了为什么显微构造指示近直立的最大主压应力(σ1)。这个流体-构造模式支持断层阀模式,并且无须改变区域应力场就可解释脉体内局部主压应力的变化。

关键词：流体动力学流体-构造关系造山型金矿流体包裹体面显微构造

Quantum Information Processing Using the Exchange Interaction

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Journal of Quantum Information Science 2018年第4期8卷 139-160页

作者： M. guha Majumdar Cavendish Laboratory University of Cambridge Cambridge UK

In this paper, I propose new models of quantum information processing using the exchange interaction in physical systems. The partial SWAP operator that can be realized using the exchange interaction is used as the underlying resource for defining models of quantum computation, quantum communication, quantum memory and decoherence-free subspaces. Given the non-commutativity of these operators (for adjacent operators operating on a common qubit), a number of quantum states and entanglement patters can be obtained. This zoo of states can be classified, due to the parity constraints and permutation symmetry of the states, into invariant subspaces that are used for the definition of some of the applications in this paper.

关键词： Entanglement Quantum Computation Quantum Communication

Classical Hodgkin＇s Lymphoma Presenting as Acute Hepatic Failure One Case Report

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Clinical oncology and cancer researeh 2010年第6期7卷 373-376页

作者： Pradipta guha Shivesh Shanker Sahai Sekhar Mukherjee Sanjoy Kumar Chatterjee Department of cardiology G.B. Pant Hospital New Delhi 110002 India. Department of General Medicine Medica College Kolkata-700073 West Bengal India.

A 20-year-old boy presenting daily febrile episodes was suspected to have developed acute hepatic failure. Serologic tests ruled out infectious and autoimmune causes apart from drug toxicity. During clinical examinations, he was found to have generalized enlarged lymph nodes that were then taken biopsy. It was diagnosed as classical Hodgkin＇s lymphoma based on histological examination of the lymph node. A bone marrow biopsy showed marrow infiltration by Hodgkin＇s lymphoma with hemophagocytosis and secondary myelofibrosis. A percutaneous liver biopsy demonstrated hepatic involvement of the same disease. After an extensive work-up, the cause of liver failure was figure out to be only attributed to the involvement of the lymphoma. Hodgkin＇s lymphoma as a cause of hepatic failure is rare and young patients diagnosed as Hodgkin＇s lymphoma causing hepatic failure has been reported very rarely so far.

关键词： Hodgkin's disease bone marrow liver failure acute.