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Morphology control and photovoltaic application of solvothermally synthesized PbS nanostructures
Goswami, S.K.,Oh, E. North-Holland 2014 Materials letters Vol.117 No.-
<P>PbS nanostructures are synthesized using solvothermal method. Here, EDTA is employed as a chelating agent and PEG-PPG-PEG polymer as a structure directing surfactant. The possible factors behind the formation of nanostructures of various morphologies are explained. Crystalline quality is improved when EDTA is employed in the growth. In the Raman spectra, overtones of the longitudinal optical (LO) phonon peaks are observed. In the I-V characteristics of the photovoltaic devices, both open circuit voltage and short circuit current were improved as compared to the earlier devices made by using a similar mechanical pressing method with PbS nanowires. (C) 2013 Elsevier B.V. All rights reserved,</P>
Role of Dietary Zinc as a Nutritional Immunomodulator
Goswami, T.K.,Bhar, R.,Jadhav, S.E.,Joardar, S.N.,Ram, G.C. Asian Australasian Association of Animal Productio 2005 Animal Bioscience Vol.18 No.3
Zinc is ubiquitous in all living cells. Structural and catalytic properties of cellular enzymes are zinc dependent. Zinc deficiency leads to a variety of pathological abnormalities with immune impairment. It is an established fact that nutritional status contributes to overall immune response of individuals. Outcome of zinc deficiency on immune system is so drastic that it is difficult to conceive at the first instance. Zinc supplementation has been advocated to prevent diarrheal disease in children with poor nutritional status. The bioavailability of zinc depends upon its sources. Moreover it varies between monogastrics and ruminants. Controversy still prevails between inorganic and organic sources of zinc with respect to their superiority in bioavailability. Zinc exerts immunostimulatory effects in various laboratory and farm animals. Animals having congenital zinc deficiency diseases like A46 lethal trait usually die due to impairment of the immune system unless treated with zinc. The immune mechanism of zinc and its effect on animals and man are discussed. Zinc has been considered as extremely safe at higher therapeutic doses, but does not provide any beneficial effect but rather may cause immunosuppression. More recently, zinc has been prescribed for immunodeficient hosts, to modulate the immune system so that to a certain extent it can combat against opportunistic pathogens.
Carbon Fibres for the Repair of Abdominal Wall Defects in Rabbits
A.K. Gangwar,A.K. Sharma,Naveen Kumar,S.K. Maiti,N. Kumar,O.P. Gupta,T.K. Goswami,Rajendra Singh 한국탄소학회 2005 Carbon Letters Vol.6 No.1
Sixteen clinically healthy New Zealand white rabbits of either sex were divided into two equal groups I and II of 8 animals each. Under thiopental sodium (2.5%) anaesthesia a linear full thickness abdominal wall defect of 3 cm in length was created and repaired with continuous suture pattern using 3000 filaments of carbon fibres and 1~0 black braided nylon suture, ingroup I and II respectively. Increased vascularity was observed in carbon fibres (group I) and on day 30 the carbon fibres were covered by white fibrous tissue. Significantly higher (P < 0.05) values of glucose was seen on day 14 in group I, whereas, decrease in glucose value was observed in group II. Histopathologically, the carbon fiber implant induced extensive fibrous tissue (collagen fiber) reaction. Negligible inflammatory cells in the stroma indicate the host tissue tolerance to carbon fibers. Histochemically, gradually increased alkaline phosphatase activity up to day 14 in group I, suggested the proliferation of fibroblasts in early stages.
Studies of Dust Acoustic Double Layers in the presence of Trapped Particles
M. K. Mahanta,R. Moulick,K. S. Goswami 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.2
An analytical solution for time stationary weak double layers in an unmagnetized dusty plasma byusing Sagdeev’s pseudopotential method is studied considering dusts with constant charge and mass. Here, the plasma consists of electrons, ions and negatively-charged micron-sized dust particles. From the study, expressions for the potential and the dust acoustic velocity of the double layer isdetermined.
A. Naglot,S. Goswami,I. Rahman,D. D. Shrimali,Kamlesh K. Yadav,Vikas K. Gupta,Aprana Jyoti Rabha,H. K. Gogoi,Vijay Veer 한국식물병리학회 2015 Plant Pathology Journal Vol.31 No.3
Indigenous strains of Trichoderma species isolated from rhizosphere soils of Tea gardens of Assam, north eastern state of India were assessed for in vitro antagonism against two important tea fungal pathogens namely Pestalotia theae and Fusarium solani. A potent antagonist against both tea pathogenic fungi, designated as SDRLIN1, was selected and identified as Trichoderma viride. The strain also showed substantial antifungal activity against five standard phytopathogenic fungi. Culture filtrate collected from stationary growth phase of the antagonist demonstrated a significantly higher degree of inhibitory activity against all the test fungi, demonstrating the presence of an optimal blend of extracellular antifungal metabolites. Moreover, quantitative enzyme assay of exponential and stationary culture filtrates revealed that the activity of cellulase, β-1,3-glucanase, pectinase, and amylase was highest in the exponential phase, whereas the activity of proteases and chitinase was noted highest in the stationary phase. Morphological changes such as hyphal swelling and distortion were also observed in the fungal pathogen grown on potato dextrose agar containing stationary phase culture filtrate. Moreover, the antifungal activity of the filtrate was significantly reduced but not entirely after heat or proteinase K treatment, demonstrating substantial role of certain unknown thermostable antifungal compound(s) in the inhibitory activity.
Carbon Fibres for the Repair of Abdominal Wall Defects in Rabbits
Gangwar, A.K.,Sharma, A.K.,Kumar, Naveen,Maiti, S.K.,Kumar, N.,Gupta, O.P.,Goswami, T.K.,Singh, Rajendra Korean Carbon Society 2005 Carbon Letters Vol.6 No.1
Sixteen clinically healthy New Zealand white rabbits of either sex were divided into two equal groups I and II of 8 animals each. Under thiopental sodium (2.5%) anaesthesia a linear full thickness abdominal wall defect of 3 cm in length was created and repaired with continuous suture pattern using 3000 filaments of carbon fibres and 1~0 black braided nylon suture, ingroup I and II respectively. Increased vascularity was observed in carbon fibres (group I) and on day 30 the carbon fibres were covered by white fibrous tissue. Significantly higher (P < 0.05) values of glucose was seen on day 14 in group I, whereas, decrease in glucose value was observed in group II. Histopathologically, the carbon fiber implant induced extensive fibrous tissue (collagen fiber) reaction. Negligible inflammatory cells in the stroma indicate the host tissue tolerance to carbon fibers. Histochemically, gradually increased alkaline phosphatase activity up to day 14 in group I, suggested the proliferation of fibroblasts in early stages.
Naglot, A.,Goswami, S.,Rahman, I.,Shrimali, D.D.,Yadav, Kamlesh K.,Gupta, Vikas K.,Rabha, Aprana Jyoti,Gogoi, H.K.,Veer, Vijay The Korean Society of Plant Pathology 2015 Plant Pathology Journal Vol.31 No.3
Indigenous strains of Trichoderma species isolated from rhizosphere soils of Tea gardens of Assam, north eastern state of India were assessed for in vitro antagonism against two important tea fungal pathogens namely Pestalotia theae and Fusarium solani. A potent antagonist against both tea pathogenic fungi, designated as SDRLIN1, was selected and identified as Trichoderma viride. The strain also showed substantial antifungal activity against five standard phytopathogenic fungi. Culture filtrate collected from stationary growth phase of the antagonist demonstrated a significantly higher degree of inhibitory activity against all the test fungi, demonstrating the presence of an optimal blend of extracellular antifungal metabolites. Moreover, quantitative enzyme assay of exponential and stationary culture filtrates revealed that the activity of cellulase, ${\beta}$-1,3-glucanase, pectinase, and amylase was highest in the exponential phase, whereas the activity of proteases and chitinase was noted highest in the stationary phase. Morphological changes such as hyphal swelling and distortion were also observed in the fungal pathogen grown on potato dextrose agar containing stationary phase culture filtrate. Moreover, the antifungal activity of the filtrate was significantly reduced but not entirely after heat or proteinase K treatment, demonstrating substantial role of certain unknown thermostable antifungal compound(s) in the inhibitory activity.
A Study to Examine the Superiority of CSAVK, AVK over Conventional Encryption with a Single Key
Rajat S Goswami,Swarnendu K Chakraborty,Chandan T Bhunia 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.2
Time variant key is one of the great research challenges in the field of cryptography for achieving the perfect security. Automatic variable Key (AVK) has been well researched and established as an important technique to realize time variant key in achieving towards perfect security. In AVK, proposed by Bhunia, the key is made to vary from data to data or session to session that is essentially required for achieving perfect secrecy. The variable key is generated in each time a data is sent and or a session is made. The time variant key (in AVK) is found to reduce the frequency attack as seen in earlier research, while such key was in applied in AES algorithm. In the present experimental research the authors study the application of AVK & Computing & Shifting AVK (CSAVK) in RSA to examine the reducing effect of frequency attack.