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Kokrajhar, India

Basak S.,Kokrajhar Government College | Karanjai S.,North Bengal University
Journal of Quantitative Spectroscopy and Radiative Transfer | Year: 2010

The equation of transfer for interlocked multiplets in anisotropically scattering atmosphere with planetary phase function has been considered. The Planck function is considered as exponential function of optical depth. The diffusely reflected intensity and emergent intensity in nth approximation has been obtained. Attempt has been made to get exact diffusely reflected intensity and emergent intensity. © 2009 Elsevier Ltd. All rights reserved. Source

Ramesha K.P.,National Research Center on Yak | Biswas T.K.,National Research Center on Yak | Jayakumar S.,National Research Center on Yak | Jayakumar S.,Molecular Genetics Laboratory | And 5 more authors.
Indian Journal of Animal Sciences | Year: 2012

Bovine microsatellite markers were used to assess their applicability for population genetic studies in Indian yaks. Out of 30 microsatellite markers tested 27 (90%) successfully amplified yak genomic DNA, of which 23 (85%) were polymorphic with allele number ranging from two to seven. A total of 69 alleles were detected. The Polymorphic Information Content (PIC) values were high (> 0.5) in most of the primers studied. The observed heterozygosity (Ho) in Indian yaks ranged from 0.369 to 0.819, while expected heterozygosity ranged from 0.413 to 0.732. The study validated the usefulness of the cattle microsatellite markers for genetic diversity analysis in yaks. Source

Swargiari B.N.,Kokrajhar Government College
International Journal of Pharma and Bio Sciences | Year: 2015

α-amylases are most important industrial enzyme and hold a major market share of enzyme sales. They hydrolyze starch molecules to small diverse products as dextrin and progressively smaller molecules of glucose units. α-amylases belong to the family 13(GH-13) of the glycoside hydrolase group of enzymes. Microbial α-amylases have a wide range of applications ranging from starch conversion to pharmaceutical applications. This article highlights on the characteristic features of α-amylase structure, function, family, primary microbial sources and uses of α-amylases in industrial purposes. Source

Nath S.K.,Tezpur University | Nath S.K.,Kokrajhar Government College | Dutta R.K.,Tezpur University
Desalination and Water Treatment | Year: 2015

Removal of fluoride from groundwater for drinking purpose and from wastewater is a serious global problem. Though several defluoridation methods are available, each of them has certain merits and demerits. Precipitation and adsorption of fluoride are among the low-cost methods that have been used for years. Calcium materials have certain edges over other types of materials applied for precipitation and adsorption of fluoride. Hydroxyapatite (HAP), quick lime, slack lime, calcium chloride, limestone or calcium carbonate, calcium phosphate, calcium nitrate, calcium sulfate, etc. are among the calcium materials used for fluoride removal. In this paper, the significance of use of different calcium containing materials, their fluoride removal mechanism, and the prospects of application for the purpose have been critically reviewed. Considering easy availability, low cost, and high efficiency, HAP and limestone based processes may be potential clean choices for fluoride removal if the capacity and sludge disposal are adequately addressed. © 2013, Balaban Desalination Publications. All rights reserved. Source

Bhattacharjee C.,Assam University | Bhattacharjee C.,Kokrajhar Government College | Deb D.,Assam University | Das H.S.,Assam University | And 2 more authors.
Publications of the Astronomical Society of Australia | Year: 2011

Bidirectional reflectance of a surface is defined as the ratio of the scattered radiation at the detector to the incident irradiance as a function of geometry. Accurate knowledge of the bidirectional reflection function for layers composed of discrete, randomly positioned scattering particles is essential for many remote sensing, engineering, and biophysical applications, as well as for different areas of astrophysics. Computations of bidirectional reflection functions for plane parallel particulate layers are usually reduced to solving the radiative transfer equation by the existing techniques. In this work we present our laboratory data on bidirectional reflectance versus phase angle for two sample sizes of alumina, 0.3 and 1m, for the HeNe laser at wavelengths of 632.8nm (red) and 543.5nm (green). The nature of the phase curves of the asteroids depends on the parameters like particle size, composition, porosity, roughness, etc. In the present study we analyze data which are being generated using a single scattering phase function, that is, Mie theory of treating particles as a compact sphere. The well-known Hapke formula, along with different particle phase functions such as Mie and HenyeyGreenstein, will be used to model the laboratory data obtained at the asteroid laboratory of Assam University. © Astronomical Society of Australia 2011. Source

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