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匹配条件: “Utpal Singha Roy” ,找到相关结果约5570条。
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SEASONAL DIVERSITY AND ABUNDANCE OF HERPETOFAUNA IN AND AROUND AN INDUSTRIAL CITY OF WEST BENGAL, INDIA
ARIJIT PAL,SOMENATH DEY,UTPAL SINGHA ROY
Journal of Applied Sciences in Environmental Sanitation , 2012,
Abstract: Biological diversity intrinsically pedals the functioning and stabilization of an ecosystem. Among faunal diversity herpetofaunal (amphibians and reptiles) checklist serve a major role which provide the information of productivity and community dynamics. The present study was carried out at Durgapur, West Bengal, India from August 2009 to July 2011 with the objective to register the seasonal diversity and abundance of herfetofauna in and around the industrial region with special reference to the anthropogenic interventions. Diverse habitat types were surveyed applying hand capture, opportunistic spotting, road kill analysis, call survey and acquiring information from local people. Present survey revealed the richness of the Durgapur industrial area in its herpetofaunal diversity where 9 species of amphibians and 24 species of reptiles were recorded in the study area with the highest abundance observed during the rainy season. Duttaphrynus melanostictus was the most common amphibian species to register while Mycrohyla ornata was the rarest. So far as the reptilian diversity is concerned only one species of turtle (Melanochelys trijuga), eight species of lizards and fifteen snake species were recorded. An overall negative anthropogenic influence on herpetofaunal diversity, distribution and abundance was evidenced from the present study and needs further investigation.
Study on avifaunal diversity from three different regions of North Bengal, India
Utpal Singha Roy,Purbasha Banerjee,S. K. Mukhopadhyay
Asian Journal of Conservation Biology , 2012,
Abstract: A rapid avifaunal diversity assessment was carried out at three different locations of north Bengal viz. Gorumara National Park (GNP), Buxa Tiger Reserve (BTR) (Jayanti/Jainty range) and Rasik Beel Wetland Complex (RBWC) during 2nd November and 14th November 2008. A total of 117 bird species belonging to 42 families were recorded during the present short span study. The highest bird diversity was recorded in GNP with 87 bird species, followed by RBWC (75) and BTR (68). The transition zones between GNP and BTR, BTR and RBWC and GNP and RBWC were represented by 51, 41 and 57 common bird species, respectively. A total of 36 bird species were recorded in all three study sites. This diverse distribution of bird species was reflected in the study of diversity indices where the highest Shannon–Wiener diversity index score of 3.86 was recorded from GNP followed by RBWC (3.64) and BTR (2.84). The similar trend was also observed for Simpson’s Dominance Index, Pielou’s Evenness Index and Margalef’s Richness Index. Consequently in the dendrogram analysis, we found that GNP and RBWC were much closer to each other while BTR remained distantly located form this cluster. The present study recorded two birds viz. Black-naped oriole (Oriolus chinensis) and Marshall’s iora (Aegithina nigrolutea) previously not reported from the present study location. Like other protected areas of the country the present study location is also facing conservation challenges and more intensive studies will certainly reveal the impact of anthropogenic alteration of the habitats in and around the present study location along with the enrichment of knowledge for the avifaunal diversity.
Metallothionein as a Biomarker to Assess the Effects of Pollution on Indian Major Carp Species from Wastewater-Fed Fishponds of East Calcutta Wetlands (a Ramsar Site)
Utpal Singha Roy,Buddhadeb Chattopadhyay,Siddhartha Datta,Subhra Kumar Mukhopadhyay
Environmental Research, Engineering and Management , 2011, DOI: 10.5755/j01.erem.58.4.660
Abstract: Metals are one of the major chemical toxicants that can perturb environmental homogeneity by their prolonged persistence and complex interactions. Bioaccumulation of any metal above its threshold level invariably results in stress often leading to irreversible physiological conditions. The present investigation was carried out to study the potential stress that fish species are facing in wastewater-fed (contaminated) fishponds in East Calcutta Wetlands (ECWs), manifested in total protein and metallothionein (MT) concentrations. Indian major carps (IMCs) – rohu (Labeo rohita), katla (Catla catla) and mrigel (Cirrhinus mrigala) were used as suitable fish models. Total protein concentration of different fish tissues were found to be always lower in wastewater-fed fishponds when compared to fish tissues from freshwater-fed (uncontaminated) fishponds, while an indirect enzyme-linked immunosorbent assay (ELISA) revealed a higher expression of MT in all the fish tissues collected from wastewater-fed fishponds. Major significances drawn from the present study were that fish species cultivated in east Calcutta wetland, with its ecosystem being under a potential threat of contamination and stress induced by composite effluents, could lead to adverse physiological conditions. Moreover, these findings could be important in terms of designing biomarkers for an early environmental warning system and also for monitoring fish health.
A Review on Phylogenetic Analysis: A Journey through Modern Era  [PDF]
Sourav Singha Roy, Rakhi Dasgupta, Angshuman Bagchi
Computational Molecular Bioscience (CMB) , 2014, DOI: 10.4236/cmb.2014.43005
Abstract: Phylogenetic analysis may be considered to be a highly reliable and important bioinformatics tool. The importance of phylogenetic analysis lies in its simple manifestation and easy handling of data. The simple tree representation of the evolution makes the phylogenetic analysis easier to comprehend and represent as well. The varied applications of phylogenetics in different fields of biology make this analysis an absolute necessity. The different aspects of phylogenetic analysis have been described in a comprehensive manner. This review may be useful to those who would like to have a firsthand knowledge of phylogenetics.
Quantitative Analysis of Photo-Thermal Stability of CdSe/CdS Core-Shell Nanocrystals
A. Singha,A. Roy
Physics , 2005, DOI: 10.1557/jmr.2006.0170
Abstract: We report here investigations on the instability in luminescence of bare (TOPO-stabilized) and CdS- capped CdSe particles under infrared radiation. During photo-thermal annealing the formation of oxide layers on the surfaces of the particles create defect states. Consequently there is a reduction in particle size. These two effects control the light output from the samples. We make a quantitative comparison of the stability of bare CdSe and core-shell type CdSe-CdS particles under photo-annealing. Using diffusion theory, we show that the volume of the oxide layer, adhered to the crystallites, play a dominant role in controlling the luminosity of the particles.
Nuclear Spins as Quantum Testbeds: Singlet States, Quantum Correlations, and Delayed-choice Experiments
Soumya Singha Roy
Physics , 2012,
Abstract: Nuclear Magnetic Resonance (NMR) forms a natural test-bed to perform quantum information processing (QIP) and has so far proven to be one of the most successful quantum information processors. The nuclear spins in a molecule treated as quantum bits or qubits which are the basic building blocks of a quantum computer. The development of NMR over half a century puts it in a platform where we can utilize its excellent control techniques over an ensemble of spin systems and perform quantum computation in a highly controlled way. Apart from a successful quantum information processor, NMR is also a highly powerful quantum platform where many of the potentially challenging quantum mechanical experiments can be performed.
A spectroscopic study of the interaction of the antioxidant naringin with bovine serum albumin  [PDF]
Atanu Singha Roy, Debi Ranjan Tripathy, Angshuman Chatterjee, Swagata Dasgupta
Journal of Biophysical Chemistry (JBPC) , 2010, DOI: 10.4236/jbpc.2010.13017
Abstract: The interaction of naringin with bovine serum albumin has been performed using fluorescence, circular dichroism and fourier transform infrared spectroscopy in 20 mM phosphate buffer of pH 7.0 as well as molecular docking studies. The changes in enthalpy (ΔH°) and entropy (ΔS°) of the interaction were found to be +18.73 kJ/mol and +143.64 J mol-1 K-1 respectively, indicating that the interaction of naringin with bovine serum albumin occurred mainly through hydrophobic interactions. Negative values of free energy change (ΔG°) at different temperatures point toward the spontaneity of the interaction. Circular dichroism studies reveal that the helical content of bovine serum albumin decreased after interaction with naringin. According to the F?rster non-radiative energy transfer theory the distance between Trp 213 residue and naringin was found to be 3.25 nm. Displacement studies suggest that naringin binds to site 1 (subdomain IIA) of bovine serum albumin (BSA) which was also substantiated by molecular docking studies.
Rotating Morse wave packet dynamics of diatomic molecule
Utpal Roy,Suranjana Ghosh
Physics , 2009,
Abstract: We investigate the dynamics of a rotating Morse wave packet, appropriate for a ro-vibrating diatomic molecule. The coupling between vibrational and rotational degrees of freedom is explicated in real position space as well as in phase space Wigner distribution of a SU(2) coherent state at various dynamically evolved times. We choose the well studied $I_{2}$ molecule with the parameter values in good agrement with experiments. A quantitative measure of the angles of rotations for different angular momenta is also given.
Biochemical characterization of an anti-Candidafactor produced by Enterococcus faecalis
Raeesh M Shekh, Utpal Roy
BMC Microbiology , 2012, DOI: 10.1186/1471-2180-12-132
Abstract: An anti-Candida protein (ACP) produced by E. faecalis active against 8?C. albicans strains was characterised and partially purified. The ACP showed a broad-spectrum activity against multidrug resistant C. albicans MTCC 183, MTCC 7315, MTCC 3958, NCIM 3557, NCIM 3471 and DI. It was completely inactivated by treatment with proteinase K and partially by pronase E.The ACP retained biological stability after heat-treatment at 90?C for 20 min, maintained activity over a pH range 6?10, and remained active after treatment with ?-amylase, lipase, organic solvents, and detergents. The antimicrobial activity of the E. faecalis strain was found exclusively in the extracellular filtrate produced in the late logarithmic growth phase. The highest activity (1600 AU mL-1) against C. albicans MTCC 183 was recorded at 48 h of incubation, and activity decreased thereafter. The peptide showed very low haemagglutination and haemolytic activities against human red blood cells. The antimicrobial substance was purified by salt-fractionation and chromatography.Partially purified ACP had a molecular weight of approximately 43 KDa in Tricine-PAGE analysis. The 12 amino acid N terminal sequence was obtained by Edman degradation. The peptide was de novo sequenced by ESI-MS, and the deduced combined sequence when compared to other bacteriocins and antimicrobial peptide had no significant sequence similarity.The inhibitory activity of the test strain is due to the synthesis of an antimicrobial protein. To our knowledge, this is the first report on the isolation of a promising non-haemolytic anti-Candida protein from E. faecalis that might be used to treat candidiasis especially in immunocompromised patients.
Multi Agent System Based Scheme for Revised National Tuberculosis Control Program
Shibakali Gupta,Sesa Singha Roy,Indrasish Bannerjee
Journal of Global Research in Computer Science , 2011,
Abstract: The rising prevalence of tuberculosis (TB) has economic repercussions not only for the patient’s family but also for the country. According to the survey conducted by World Health Organization (WHO), the Philippines ranks fourth in the world for the number of cases of tuberculosis and has the highest number of cases per head in Southeast Asia. Almost five million people are infected yearly by tuberculosis in our country. The rise in the occurrence of tuberculosis has been due to the low priority accorded to anti-tuberculosis activities by many countries. The unavailability of anti-TB drugs, insufficient laboratory networking, poor health infrastructures, including a lack of trained health personnel, have also contributed to the rise in the incidence of the disease. We start by reviewing the till date statistics of the tuberculosis effect worldwide as well as in India. Then we discuss about the programs undertaken worldwide for restraining the effect of TB, where we have given brief account of National TB Control Programme as well as the Revised National TB Control Programme (RNTCP) undertaken worldwide as well as in India. The rest of the paper deals with our main research work which deals with the development of an automated, intelligent, easy-to-use computerised system for an easy diagnosis of TB ,which is advantageous over the paper-pen based programmes undertaken. Our system is implemented using Multi Agent System.
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