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The Influence of Cobalt Acetate on Sol-gel Derived Mullite Densification Behaviour

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Journal of Wuhan University of Technology(Materials Science) 2012年第5期27卷 836-840页

作者： debasis Roy Biswajoy Bagchi Alakananda Bhattacharya Sukhen das Papiya Nandy Physics Department Jadavpur University

Monophasic mullite （3Al2O3？2SiO2） samples doped with 0.002 M, 0.02 M, 0.1 M, 0.15 M and 0.2 M of cobalt were prepared by a sol-gel process. Prepared gels were then dried, grinded, pressed into pellets and sintered at 1 000 °C and 1 300 °C for 4 h. Phase formation and densification behavior has been investigated as a function of the cobalt content and sintering temperature. Mullite densification behavior was analyzed .The density of the sintered ceramics was measured using Archimedes method. CoO and Co related compounds were detected by the analysis for G3, G4 and G5 doping levels. The mullite X-ray diffraction suggests predominant incorporation of Co in the glassy phase, whose quantity increased with the doping level.

关键词： sol-gel processes nanocomposite XRD FESEM mullite

Recent developments in the asymmetric synthesis and functionalization of symmetrical and unsymmetrical gem-diborylalkanes

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Organic Chemistry Frontiers 2022年第3期9卷 838-852页

作者： Swagata Paul Kanak Kanti das debasis Aich Samir Manna Santanu Panda Department of Chemistry Indian Institute of TechnologyKharagpur721302India

gem-Diborylalkanes are an important class of organoboron compounds as they function as a key building block in organic *** the last decade,there has been growing interest in the enantioselective synthesis of gem-diborylalkanes to access a sp^(3) chiral center with two functionalizable *** review summarizes the recent development of the enantioselective synthesis of gem-diborylalkanes and their application in asymmetric synthesis.

关键词： synthesis alkanes synthesis

Abrupt change of dielectric properties in mullite due to titanium and strontium incorporation by sol-gel method

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Journal of Advanced Ceramics 2014年第4期3卷 278-286页

作者： Biplab Kumar PAUL Kumaresh HALDAR debasis ROY Biswajoy BAGCHI Alakananda BHATTACHARYA Sukhen das Physics Department Jadavpur UniversityKolkata-700032India

Highly crystallized mullite has been achieved at temperatures of 1100℃and 1400℃by sol-gel technique in presence of titanium and strontium ions of different concentrations:G_(0)=0 M,G_(1)=0.002 M,G_(2)=0.01 M,G_(3)=0.02 M,G_(4)=0.1 M,G_(5)=0.2 M and G6=0.5 M.X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),field emission scanning electron microscopy(FESEM),LCR meter characterized the *** formation was found to depend on the concentration of the *** dielectric properties(dielectric constant,loss tangent and AC conductivity)of the composites have been measured,and their variation with increasing frequency and concentration of the doped metals was *** the experiments were performed at room *** composites showed maximum dielectric constants of 24.42 and 37.6 at 1400℃of 0.01 M concentration for titanium and strontium ions at 2 MHz,*** to the perfect nature of the doped mullite,it can be used for the fabrication of high charge storing capacitors and also as ceramic capacitors in the pico range.

关键词： mullite sol-gel technique X-ray diffraction(XRD) dielectric properties field emission scanning electron microscopy(FESEM)

Molecular differentiation of cryptic stage of Echinococcus granulosus and Taenia species from faecal and environmental samples

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Asian Pacific Journal of Tropical Medicine 2010年第4期3卷 253-256页

作者： Diganta Pan Sumanta De Asit Kumar Bera Subhashis Bandyopadhyay Subrata Kumar das debasis Bhattacharya Indian Veterinary Research Institute Eastern Regional Station37-Belgachia RoadKolkata-700 037West BengalIndia

Objective:To differentiate cryptic stage of Echinococcus granulosus(***) and Taenia by PCR-RFLP and sequence information of ***:DNA were isolated from metacestodes stage of Taenia and *** using DNA isolation kit(Q-BIOgene kit,USA), the amplified and purified DNA product was then cloned and sent for *** generating sequence information was used for amplicons ***:Out of 112 faecal and environmental samples,16 exhibited positive *** product size of amplicon positive for *** was 310 bp;whereas,for Taenia *** varied from 379 to 388 *** pr of ile of actinⅡwith Csp61 also differed Taenia *** ***:The result of the study indicated that,the primers were useful to differentiate cryptic stage of the two genera which is yet to be reported earlier.

关键词： Taenia solium Echinococcus granulosus Environmental samples PCR-RFLP

Articulating beneficial rhizobacteria-mediated plant defenses through induced systemic resistance:A review

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Pedosphere 2023年第4期33卷 556-566页

作者： Aniruddh RABARI Janki RUPARELIA Chaitanya Kumar JHA Riyaz Z.SAYYED debasis MITRA Ankita PRIYADARSHINI Ansuman SENAPATI Periyasamy PANNEERSELVAM Pradeep K.das MOHAPATRA Department of Microbiology and Biotechnology Gujarat UniversityAhmedabadGujarat 380006(India) Microbiology Department Gujarat Arts and Science CollegeEllisbridgeAhmedabadGujarat 380006(India) Department of Microbiology PSGVP Mandal's ArtsScience and Commerce CollegeMaharashtraShahada 425409(India) Department of Microbiology Raiganj UniversityRaiganjUttar DinajpurWest Bengal 733134(India) Crop Production Division Indian Council of Agriculture Research(ICAR)-National Rice Research InstituteCuttackOdisha 753006(India) Professor A.K.B.Environment Conservation Centre Raiganj UniversityRaiganjWest Bengal 733134(India)

Induced systemic resistance(ISR)is a mechanism by which certain plant beneficial rhizobacteria and fungi produce immunity,which can stimulate crop growth and resilience against various phytopathogens,insects,and *** beneficial rhizobacteria and fungi improve plant performance by regulating hormone signaling,including salicylic acid(SA),jasmonic acid(JA),prosystemin,pathogenesis-related gene 1,and ethylene(ET)pathways,which activate the gene expression of ISR,the synthesis of secondary metabolites,various enzymes,and volatile compounds that ultimately induce defense mechanisms in *** protect themselves from disease,plants have various advanced defense mechanisms in which local acquired resistance,systemic gene silencing,systemic wound response,systemic acquired resistance(SAR),and ISR are *** rhizobacteria activate the SA-dependent SAR pathway by producing SA at the root’s *** contrast,other rhizobacteria can activate different signaling pathways independent of SA(SA-independent ISR pathways)such as those dependent on JA and ET *** main objective of this review is to provide insight into the types of induced resistance utilized for plant *** to this,the genetic approaches used to suppress disease-causing genes,i.e.,RNA interference and antisense RNA,which are still underutilized in sustainable agriculture,along with the current vision for virus-induced gene silencing are also discussed.

关键词： biocontrol gene silencing local acquired resistance phytohormone secondary induced resistances signaling pathways systemic acquired resistance

Fluctuating Role of Parameters in the Analysis of the Continues and Discrete Version of a Susceptible-Incubated-Infected Model

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International Journal of Modern Nonlinear Theory and Application 2012年第2期1卷 47-50页

作者： Prasenjit das debasis Mukherjee Kalyan das A. Sabarmathi Baikunthapur High School Maipith India Department of Mathematics National Institute of Food Technology Entrepreneurship and Management HSIIDC Industrial Estate Kundli India Department of Mathematics School of Advanced Sciences VIT University Vellore India Department of Mathematics Vivekananda College Kolkata India

The article concentrates on the role of fluctuating parameters for removable population from the incubated class in a susceptible-incubated-infected model. The discrete analogous of this model is also investigated. Conditions for local asymptotic stability are derived for both the disease free and endemic cases. Numerical simulations are performed to validate the theoretical results.

关键词： Incubated Class Stability Schur-Cohn Criterion

Synthesis and Characterisations of TiO<sub>2</sub>Coated Multiwalled Carbon Nanotubes/Graphene/Polyaniline Nanocomposite for Supercapacitor Applications

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Open Journal of Applied Sciences 2012年第2期2卷 70-77页

作者： debasis Ghosh Soumen Giri Swinderjeetsingh Kalra Chapal Kumar das Department of Chemistry Dayanand Anglo-Vedic (D.A.-V.) College Kanpur India Materials Science Centre Indian Institute of Technology Kharagpur Kharagpur India

Nowadays with ever increasing demand of energy, developing of alternative power sources is an important issue all over the world. In this respect we have prepared nanocomposites based on metal oxide (titanium oxide) coated multiwalled carbon nanotubes (MWCNTs)/polyaniline (PANI) with graphene and without graphene and studied their electrochemical performance. The formation of the polymer in the nanocomposites was confirmed by the Fourier Transform Infrared Spectroscopy (FTIR) study. The morphological characterisations were carried out by the Field Emission Scanning Electron Microscopy (FESEM) and Transmission Electron Microscopy (TEM). To characterize the prepared nanocomposites electrode, a cyclic voltammetry test for measuring specific capacitance, and an impedance test were conducted. The highest value of specific capacitance obtained for the TiO2 coated MWCNTs/PANI nanocomposite was 443.57 F/g at 2 mV/s scan rate. Upon addition of graphene nanosheet to the TiO2 coated MWCNTs in a weight ratio of (9:1) the specific capacitance value increased to 666.3 F/g at the same scan rate, also resulting in an increase in energy density and power density.

关键词： Supercapacitors Polyaniline Nanocomposites Graphene Nanosheet

Bronchogenic Carcinoma in a Scleroderma Patient with Multiple Metastases： One Case Report

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Clinical oncology and cancer researeh 2010年第3期7卷 214-216页

作者： Pradipta Guha Shivesh Shanker Sahai debasis Sarkar Partha Sardar Anup Singh Bipiab Mandal Bidyut Kumar das Sanjoy Kumar Chatterjee Department of General Medicine Medica College Kolkata 700083 West Bengal India.

IntroductionThe association between pulmonary interstitial fibrosis and the development of bronchogenic carcinoma in a patient with scleroderma has been reported rarely. It is hypothesized that intense epithelial proliferation that is accompanied by the .brotic process increases the occurrence of carcinomatous changes. We report the case of a pa-tient who presented with 3-year history of Raynaud＇s phenomenon, gradual tightening of the skin which was ignored by the patient and her family members, and a 2-week history of severe respiratory dis-tress with left shoulder and upper back pain followed by the develop-ment of paraparesis. After a series of examinations, the patient was diagnosed with scleroderma and simultaneously with bronchogenic carcinoma and multiple distant metastases.

关键词： scleroderma bronchogenic carcinoma metastasis.

Reduced Activation Energy of Iron and Copper Ion Doped Mullite which Can Be Used as a Substrate in Electronic Industry

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Journal of Surface Engineered Materials and Advanced Technology 2013年第3期3卷 11-17页

作者： debasis Roy Kumaresh Haldar Biplab Kumar Paul Alakananda Bhattacharya Sukhen das Papiya Nandy Physics Department Jadavpur University Kolkata India.

The crystallized mullite composite has been synthesized via sol-gel technique in the presence of transition metal ions such as iron and copper. The electrical resistivity and activation energy of the composites have been measured and their variation with concentration of the metal ion has been investigated. The resistivity of doped mullite decreases rapidly in the shorter temperature range and sharply in the higher temperature range. The decreasing resistivity is due to the 3d orbital electrons and the concentration of metal ions present. X-ray analysis confirms the presence of metal ions in mullite, which entered in the octahedral site. The Fe2+ and Cu2+ ions will substitute Al3+ ion in the octahedral site of mullite structure and most probably will be responsible for reducing the resistivity as well as the activation energy. Transition metal ion doped mullite-based ceramic can be considered as promising material as a substrate in the electronic industry, because of its reasonable atom density, its low activation characteristics, low thermal expansion coefficient and high mechanical strength. The present material we have developed has an activation energy of resistivity/band gap energy, Eg, 1.11 eV at 0.04 M concentration for Cu2+ ion.

关键词： Nanostructures Sol-Gel Growth X-Ray Diffraction Scanning Electron Microscopy (SEM) Electrical Conductivity