检索结果-南通市图书馆

Effect of poly(vinyl pyrrolidone)on the morphology and physical properties of poly(vinyl alcohol)/sodium montmorillonite nanocomposite films

引用

Progress in Natural Science:Materials International 2013年第6期23卷 579-587页

作者： Dibyendu Mondal Md.Masud R.Mollick Biplab Bhowmick dipanwita maity Mrinal K.Bain Dipak Rana Asis Mukhopadhyay Kausik Dana Dipankar Chattopadhyay Department of Polymer Science and Technology University of Calcutta Department of Chemical and Biological Engineering Industrial Membrane Research InstituteUniversity of Ottawa Department of Jute and Fiber Technology Institute of Jute TechnologyUniversity of Calcutta Advanced Clay and Traditional Ceramics Division Central Glass and Ceramic Research Institute

Nanocomposites of poly(vinyl alcohol)(PVA),poly(vinyl pyrrolidone)(PVP) and sodium montmorillonite(Na+MMT) were prepared by solution mixing and then cast into films.X-ray diffraction analysis and images of transmission electron microscopy establish the formation of PVA/Na+MMT intercalated *** and highly intercalated PVA/PVP/Na+MMT nanocomposite formed in the presence of *** of PVP in PVA/Na+MMT matrix enhances the hydrogen bonding interactions between PVA and Na+MMT and thus increases the mechanical properties and thermal stability of PVA/PVP/Na+MMT nanocomposites compared to PVA/Na+MMT *** interactions between PVA,PVP and Na+MMT were established by the Fourier transform infrared *** moisture absorption tendency of both the PVA and PVA/PVP films reduced after the incorporation of Na+MMT at 75%constant relative *** scanning calorimetry studies show that the presence of PVP and Na+MMT both are responsible for reducing the heat of fusion,and crystallinity of *** flow behavior of the PVA,PVA/PVP and its nanocomposite solutions has been also *** vapor permeability of PVA/PVP/Na+MMT composite films decreased in the presence of nanoclay due to increasing tortuous paths for diffusion.

关键词： Poly(vinyl alcohol) Poly(vinyl pyrrolidone) Sodium montmorillonite Nanocomposites Mechanical properties Water resistance properties

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Continuously non-malleable codes from block ciphers in split-state model

引用

Cybersecurity 2024年第2期7卷 68-80页

作者： Anit Kumar Ghosal dipanwita Roychowdhury Department of Computer Science and Engineering I KharagpurKharagpurWest BengalIndia

Non-malleable code is an encoding scheme that is useful in situations where traditional error correction or detection is impossible to *** ensures with high probability that decoded message is either completely unrelated or the original one,when tampering has no ***,standard version of non-malleable codes provide security against one time tampering *** ciphers are successfully employed in the construction of non-malleable *** construction fails to provide security when an adversary tampers the codeword more than *** non-malleable codes further allow an attacker to tamper the message for polynomial number of *** this work,we propose continuous version of non-malleable codes from block ciphers in split-state *** construction provides security against polynomial number of tampering attacks and it preserves *** the tam-pering experiment triggers self-destruct,the security of continuously non-malleable code reduces to security of the underlying leakage resilient storage.

关键词： Block cipher Non-malleable code Split-state model Tamper-resilient cryptography

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Achieving Better NO_x Removal in Discharge Plasma Reactor by Field Enhancement

引用

Plasma Science and Technology 2008年第2期10卷 198-202页

作者： B.S.RAJANIKANTH dipanwita SINHA High Voltage Laboratory Deptartment of Electrical Engineering Indian Institute of Science Bangalore 560012 India

Application of plasma chemistry for gas cleaning is gaining prominence in recent years, mainly from an energy efficiency point of view. In this paper we conducted a comparative study of NO/NOx removal using two different types of dielectric barrier discharge electrodes, wire- cylinder reactor, pipe-cylinder reactor. Investigations were first carried out with synthetic gases to obtain the baseline information on the NO/NOx removal with respect to the two geometries studied. Further, experiments were carried out with raw diesel exhaust under loaded condition. A high NOx removal efficiency of 90% was observed for the pipe-cylinder reactor as compared to that of 53.4% for the wire-cylinder reactor. Furthermore, for the same energy consumed per NO molecule （about 73 eV/NO molecule）, the removal efficiency increased from 67% for the wire- cylinder to about 98% for the pipe-cylinder which was quite appreciable.

关键词： NOx removal engine exhaust plasma treatment barrier discharge electrodes

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Discharge Plasma Assisted Adsorbents for Exhaust Treatment: A Comparative Analysis on Enhancing NO_x Removal

引用

Plasma Science and Technology 2008年第3期10卷 307-312页

作者： B.S.RAJANIKANTH dipanwita SINHA P.EMMANUEL Department of High Voltage Engineering Indian Institute of Science Bangalore 560012 India

An analysis has been made on the discharge plasma coupled with an adsorbent system for NOx removal. The cascaded plasma-adsorbent system may be perceived as a better alternative for the existing adsorbent-based abatement system in the industry. In this study the exhaust is sourced from a diesel generator set. It was observed that better NO removal in a plasma reactor can be made possible by achieving higher average fields and subsequent NO2 removal can be improved using an adsorbent system connected in cascade with the plasma system. The paper describes various findings pertaining to these comparative analyses.

关键词： NOx removal engine exhaust discharge plasma plasma-adsorbent non- thermal plasma

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Mosquito larvicidal activity of Rauvolfia serpentina *** against Culex quinquefasciatus Say

引用

Asian Pacific Journal of Tropical Medicine 2012年第1期5卷 42-45页

作者： dipanwita Das Goutam Chandra Mosquito and Microbiology Research Units Parasitology LaboratoryDepartment of ZoologyBurdwan UniversityWest Bengal713104India

Objective:To establish the larvicidal activities,if any of solvent extracts of Rauvolfia serpentina (***) *** against Culex quinquefasciatus(***) Say.1823 as target ***:Seeds of *** were extracted with five solvents graded according to the polarity[*** ***,ethyl acetate,acetone and absolute alcohol] continuing one after another with the same ***:Mortality rate with petroleum ether extract was significantly higher than other *** mortality rates of late 3rd instar larvae wore 50.33±5.***.10.00±1.***.0.00±0.***.21.33±1.53 and 0.00±0.00 in 100 ppm concentration of petroleum ether,benzene,ethyl acetate,acetone and absolute alcohol respectively,after 24 h of exposure ***:Results of this study show that petroleum ether extract of R. serpentina seed may be considered as a potent source of mosquito larvicidal agent.

关键词： Mosquito larvicide Rauvolfia serpentine Seeds Culex quinquefasciatus

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Anticlastogenic Effect of Redistilled Cow's Urine Distillate in Human Peripheral Lymphocytes Challenged With Manganese Dioxide and Hexavalent Chromium

引用

Biomedical and Environmental Sciences 2006年第6期19卷 487-494页

作者： dipanwita DUTTA S. SARAVANA DEVI K. KRISHNAMURTHI T. CHAKRABARTI Environmental Biotechnology Division National Environmental Engineering Research Institute (NEERI)Nehru MargNagpur-440020INDIA

Objective To study the anticlastogenic effect of redistilled cow＇s urine distillate （RCUD） in human peripheral lymphocytes （HLC） challenged with manganese dioxide and hexavalent chromium. Methods The anticlastogenic activity of redistilled cow＇s urine distillate was studied in human polymorphonuclear leukocytes （HPNLs） and human peripheral lymphocytes in vitro challenged with manganese dioxide and hexavalent chromium as established genotoxicants and clastogens which could cause induction of DNA strand break, chromosomal aberration and micronucleus. Three different levels of RCUD： 1 μL/mL, 50 μL/mL and 100 μL/mL, were used in the study. Results Manganese dioxide and hexavalent chromium caused statistically significant DNA strand break, chromosomal aberration and micronucleus formation, which could be protected by redisfilled cow＇s urine distillate. Conclusion The redistilled cow＇s urine distillate posseses strong anfigenotoxic and antielastogenic properties against HPNLs and HLC treated with Cr^＋6 and MnO2. This property is mainly due to the antioxidants present in RCUD.

关键词： Redistilled cow's urine distillate (RCUD) DNA strand break Clastogenicity Chromosomal aberration Micronuclei Hexavalent chromium and manganese dioxide

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Protective Effect of Distillate and Redistillate of Cow’s Urine in Human Polymorphonuclear Leukocytes Challenged With Established Genotoxic Chemicals

引用

Biomedical and Environmental Sciences 2004年第3期17卷 247-256页

作者： K.KRISHNAMURTHI dipanwita DUTTA S.D.SIVANESAN T. CHAKRABARTI Environmental Biotechnology Division National Environmental Engineering Research Institute Nehru Marg Nagpur-440 020 INDIA

Objective From the ancient period cow’urine has been used as a medicine. In Veda, cow’urine was compared to the nectar. In Susrut, several medicinal properties of cow’ urine have been mentioned and are known to cause weight loss, reversal of certain cardiac and kidney problems, indigestion, stomach ache, edema, etc. However, the literature and scripture did not mention the antigenotoxic properties of cow’urine. Methods In the present investigation, the antigenotoxic/ antioxidant properties of cow’ urine distillate and redistillate were studied in vitro. The antioxidant status and volatile fatty acid levels were determined. Actinomycin-D (0.1ol/L) and hydrogen peroxide (150 mol/L) were used for inducing DNA strand break with 0.1% DMSO as negative control. Dose for the antigenotoxic effect of cow’ urine was chosen from the dose response study carried out earlier. Results Both actinomycin-D and H2O2 caused statistically significant DNA unwinding of 80% & 75% respectively (P<0.001) as revealed by fluorimetric analysis of DNA unwinding (FADU), and the damage could be protected with the redistilled cow urine distillate (1, 50 & 100 ) in simultaneous treatment with genotoxic chemicals. Conclusion The redistillate of cowurine was found to possess total antioxidant status of around 2.6 mmol, contributed mainly by volatile fatty acids (1500 mg/L) as revealed by the GC-MS studies. These fatty acids and other antioxidants might cause the observed protective effects.

关键词： Ammonia Antioxidants Cow urine distillate Cow urine redistillate Human polymorphonuclear leukocytes(PMNL) DNA damage Fluorimetric analysis of DNA unwinding(FADU) Gas chromatography mass spectrometer(GC-MS) Genotoxicity Volatile fatt

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Neuroendocrine Control of Posterior Regeneration in Tropical Earthworm, Eudrilus eugeniae （Kinberg）

引用

Journal of Life Sciences 2016年第6期10卷 289-297页

作者： dipanwita Banik Priyasankar Chaudhuri Earthworm Research Laboratory Department of Zoology Tripura University (A Central University) Suryamaninagar-7990

Eudrilus eugeniae （Kinberg）, well known vermicomposting earthworms, are often subjected to predator attacks leading to loss of body parts due to their surface living habit. Thus nature has gifted them the power of regeneration of lost body parts. As neurosecretion is the sole source of hormone in oligochaetes, we hypothesize that neurohormone secreted from the neurosecretory cells of the central nervous system （CNS） will control the phenomenon of regeneration in earthworms. In Eudrilus eugeniae, appearance of regeneration blastema was noticed within 72 h of posterior amputation. In fact, posterior amputation brought about multiple cytoplasmic alteration in the neurosecretory cells （NSCs） viz. deep stained A cells and moderately stained B cells in cerebral ganglia, deep stained ＇U＇ cells and moderately stained B cells in the sub-esophageal and ventral nerve cord ganglia. Massive depletion followed by marginal accumulation of NSM in the NSCs following 24 h and 48 h of amputation were recorded. Thereafter （72 h and 96 h of amputation） moderate to massive engorgement of NSM in the B cells, coupled with spectacular increase in number of A cells were noticed. Sequential changes involved in the secretory dynamics of NSCs, as well as, NSM accumulation both within and periphery of the ganglia （perineurium） provides evidence for the utilization of materials through repaired vascular systems during posterior regeneration in E. eugeniae.

关键词： Neuroendocrine control neurosecretory cells regeneration Eudrilus eugeniae regeneration inhibiting factor regeneration promoting factor.

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Anti-viral role of toll like receptor 4 in hepatitis B virus infection: An in vitro study

引用

World Journal of Gastroenterology 2016年第47期22卷 10341-10352页

作者： dipanwita Das Neelakshi Sarkar Isha Sengupta Ananya Pal Debraj Saha Manikankana Bandopadhyay Chandrima Das Jimmy Narayan Shivram Prasad Singh Runu Chakravarty ICMR Virus Unit Kolkata ID and BG Hospital Campus Biophysics and Structural Genomics Division Saha Institute of Nuclear Physics Department of Gastroenterology SCB Medical College Kalinga Gastroenterology Foundation Beam Diagnostics Premises

AIM Toll like receptors plays a significant anti-viral role in different infections. The aim of this study was to look into the role of toll like receptor 4(TLR4) in hepatitis B virus(HBV) *** Real time PCR was used to analyze the transcription of TLR4 signaling molecules, cell cycle regulators and HBV DNA viral load after triggering the Hep G2.2.15 cells with TLR4 specific ligand. Nuclear factor(NF)-κB translocation on TLR4 activation was analyzed using microscopic techniques. Protein and cell cycle analysis was done using Western Blot and FACS *** The present study shows that TLR4 activation represses HBV infection. As a result of HBV suppression, there are several changes in host factors which include partial release in G1/S cell cycle arrest and changes in host epigenetic marks. Finally, it was observed that anti-viral action of TLR4 takes place through the NF-κB *** The study shows that TLR4 activation in HBV infection brings about changes in hepatocyte microenvironment and can be used for developing a promising therapeutic target in future.

关键词： Hepatitis B virus Toll like receptor 4 Cell cycle Epigenetic marks Innate immune response

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Modulatory Effect of Distillate of Ocimum sanctum Leaf Extract (Tulsi) on Human Lymphocytes Against Genotoxicants

引用

Biomedical and Environmental Sciences 2007年第3期20卷 226-234页

作者： dipanwita DUTTA S.SARAVANA DEVI K.KRISHNAMURTHI KOEL KUMAR PRIYANKA VYAS P.L.MUTHAL P.NAOGHARE T.CHAKRABARTI Environmental Biotechnology Division National Environmental Engineering Research Institute (NEERI)Nehru MargNagpur–440020India

Objective To study the modulatory effect of distillate of Ocimum sanctum （traditionally known as Tulsi） leaf extract （DTLE） on genotoxicants. Methods In the present investigation, we studied the antigenotoxic and anticlastogenic effect of distillate of Tulsi leaf extract on （i） human polymorphonuclear leukocytes by evaluating the DNA strand break without metabolic activation against mitomycin C （MMC） and hexavalent chromium （Cr^＋6） and （ii） human peripheral lymphocytes （in vitro） with or without metabolic activation against mitomycin C （MMC）, hexavalent chromium （Cr^＋6） and B[a]P by evaluating chromosomal aberration （CA） and micronucleus assay （MN）. Three different doses of DTLE, 50 μL/mL, 100 μL/mL, and 200 μL/mL were selected on the basis of cytotoxicity assay and used for studying DNA strand break, chromosomal aberration and micronucleus emergence. The following positive controls were used for inducing genotoxicity and clastogenicity MMC （0.29 μmol/L） for DNA strand break, chromosomal aberration and 0.51 μmol/L for micronucleus assay; Potassium dichromate （Cr^＋6） 600 μmol/L for DNA strand break and 5 μmol/L for chromosomal aberration and micronucleus assay; Benzo[a]pyrene （30 μmol/L） for chromosomal aberration and 40 μmol/L for micronucleus assay. The active ingredients present in the distillate of Tulsi leaf extract were identified by HPLC and LC-MS. Results Mitomycin C （MMC） and hexavalent chromium （Cr^＋6） induced statistically significant DNA strand break of respectively 69% and 71% （P〈0.001） as revealed by fluorometric analysis of DNA unwinding. Furthermore, the damage could be protected with DTLE （50 μL/mL, 100 μL/mL, and 200 μL/mL） on simultaneous treatment. Chromosomal aberration and micronucleus formation induced by MMC, Cr^＋6 and B[a]P were significantly protected （P〈0.001） by DTLE with and without metabolic activation. Conclusion Distillate of Tulsi leaf extract possesses antioxidants contributed mainly by eugenol, luteolin and apigenin as identified by

关键词： Distillate of Tulsi leaf extract(DTLE) Cytotoxicity DNA strand break Chromosomal aberration(CA) Micronucleus(MN) Hexavalent chromium(Cr^+6) Mitomycin C(MMC) Benzo[a]pyrene(B[a]P)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：