Shillong College

Shillong, India

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Shillong, India
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Suchiang D.,Tura Government College | Joseph Jeremiah J.,Ganadipathy Tulsis Jain Engineering College | Jyrwa B.M.,North - Eastern Hill University | Khongiang L.,Shillong College
Annals of Nuclear Energy | Year: 2014

The excitation function for (n,p) reaction from reaction threshold to 20 MeV on five Zirconium isotopes were calculated using TALYS-1.4 nuclear model code whereby we have studied major nuclear reaction mechanisms, including direct, pre-equilibrium and compound nuclear reactions. Subsequently the level density parameters and the shell damping factors have been varied to get good agreement between the calculated cross sections and experimental nuclear data. Precise estimate of neutron induced reactions at energy levels where resonance occurs is important and complete information in this field is very much required for application in Accelerator Driven Sub-critical Systems. © 2013 Elsevier Ltd. All rights reserved.


Basu S.,North - Eastern Hill University | Basu S.,Jagiellonian University | Masharing C.,Shillong College | Das B.,Indian Institute of Technology Guwahati
Heteroatom Chemistry | Year: 2012

The diorganotin(IV) complexes of methyl 2-{4-hydroxy-3-[(2-hydroxy- phenylimino)-methyl]-phenylazo}-benzoate (H2L) were obtained by the reaction of ortho-aminophenol, R 2SnO (R = Me, nBu, or Ph) and methyl 2-[(E)-(3-formyl-4-hydroxy)diazenyl]benzoate (H2PL 2) in ethanol, which led to diorganotin(IV) compounds of composition [Me 2SnL] 2 (1), nBu 2SnL (2), and Ph 2SnL (3) in good yield. The 1H, 13C, and 119Sn NMR, IR, the mass spectrometry along with elemental analyses allowed establishing the structure of ligand (H2L) and compounds 1-3. In all the three cases, 119Sn chemical shifts are indicators of five-coordinated Sn atoms in a solution state. The crystal structures of ligand H2L and complexes 1 and 2 were determined by a single crystal X-ray diffraction study. In the solid state, the ligand H2L exists as a keto-enamine tautomeric form. The molecular structure of complex 1 in the solid state shows a distorted octahedral geometry around a tin atom due to additional coordination with an oxygen atom from a neighboring molecule leading to a four-membered ring with Sn- O···Sn-O intermolecular coordination, leading to a dimeric species. On the other hand, complex 2 is a monomer with trigonal bipyramidal geometry surrounding the tin atom. Copyright © 2012 Wiley Periodicals, Inc.


Dkhar E.N.,Shillong College | Dkhar P.S.,North - Eastern Hill University | Anal J.M.H.,North - Eastern Hill University
Journal of Chemistry | Year: 2014

Determination of the certain major and trace elements was carried out in drinking water supply scheme in three districts of Meghalaya. This work aims to identify trends resulting in the deterioration of drinking water which is also a potential source of environmental contaminants. About 50 samples, each from one district, were collected both from the source and various tanks and tap. The elements determined are Li, Na, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Rb, Ag, Au, Pb, Cd, Se, Ca, K, and Mg. The pH is slightly lower than neutral pH of 7 while the turbidity is very high even after treatment. The concentrations of Ca and Mg are found to be deficient. The elements Cr, Fe, Co, Ni, Zn, Mo, and Pb decrease after treatment while Mn, Cu, and Cd increase slightly after treatment. Se concentration is found to be much higher than expected. The results were compared with the standard recommendation values for the quality of drinking water. This study provides a general indication of where water-quality constituent concentrations met or exceeded water-quality standards and the data presented in this report will be useful from public health point of view. © 2014 Elarina N. Dkhar et al.


Basu S.,North - Eastern Hill University | Masharing C.,Shillong College | Das B.,Indian Institute of Technology Guwahati
Acta Crystallographica Section E: Structure Reports Online | Year: 2010

In the title compound, [Sn(C6H5)3(C 14H9N2O4)], the Sn atom has a distorted tetra-hedral geometry with one of the carboxylate O atoms and the C atoms from three phenyl groups. The other carboxylate O atom of the benzoate ligand inter-acts weakly with the Sn atom, with an Sn⋯O distance of 2.790 (2) Å, which causes a distortion of the tetra-hedral coordination geometry.


Pala E.M.,Shillong College | Dey S.,North - Eastern Hill University
Microscopy and Microanalysis | Year: 2016

Conventional and highly sophisticated analytical methods (Cyria et al., 1989; Massar et al., 2012a) were used to analyze micro-structural and micro-analytical aspects of the blood of snake head fish, Channa gachua, exposed to municipal wastes and city garbage. Red (RBC) and white blood cell (WBC) counts and hemhemoglobin content were found to be higher in pollution affected fish as compared with control. Scanning electron microscopy revealed the occurrence of abnormal erythrocytes such as crenated cells, echinocytes, lobopodial projections, membrane internalization, spherocytes, ruptured cells, contracted cells, depression, and uneven elongation of erythrocyte membranes in fish inhabiting the polluted sites. Energy-dispersive X-ray spectroscopy (EDS) revealed the presence of silicon and lead in the RBCs of pollution affected fish. Significance of the study includes the highly sophisticated analytical approach, which revealed the aforementioned micro-structural abnormalities. © Microscopy Society of America 2016.


PubMed | Shillong College and North - Eastern Hill University
Type: Journal Article | Journal: Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada | Year: 2016

Conventional and highly sophisticated analytical methods (Cyria et al., 1989; Massar et al., 2012a) were used to analyze micro-structural and micro-analytical aspects of the blood of snake head fish, Channa gachua, exposed to municipal wastes and city garbage. Red (RBC) and white blood cell (WBC) counts and hemhemoglobin content were found to be higher in pollution affected fish as compared with control. Scanning electron microscopy revealed the occurrence of abnormal erythrocytes such as crenated cells, echinocytes, lobopodial projections, membrane internalization, spherocytes, ruptured cells, contracted cells, depression, and uneven elongation of erythrocyte membranes in fish inhabiting the polluted sites. Energy-dispersive X-ray spectroscopy (EDS) revealed the presence of silicon and lead in the RBCs of pollution affected fish. Significance of the study includes the highly sophisticated analytical approach, which revealed the aforementioned micro-structural abnormalities.


Dey S.,St Anthonys College | Goswami S.,Shillong College | Goswami M.,Silchar Medical College and Hospital
Turkish Journal of Medical Sciences | Year: 2010

Aim: To examine the prevalence of anaemia in Meghalaya, India, by exploring the 2005-2006 National Family Health Survey (NFHS -3) data. Materials and methods: The study population consisted of 3934 ever-married women of reproductive age (15-49 years) from the state Meghalaya, India, which were taken from the NFHS-3 survey, to explore the predictors responsible for the prevalence of anaemia by using different background characteristics such as age, place of residence, nutritional status, number of children ever born, pregnancy status, educational achievement, and economic status. As a response ariable, anaemia levels were categorised as a dichotomous variable, and the predicted probabilities were worked out through a binary logistic regression model, to assess the contribution of the predictors on anaemia. Results: A logistic regression analysis was performed for some selected predictors related to anaemia levels. All the predictors, except total children ever born, were found to be statistically significant. The mean aemoglobin concentration was evaluated as 117.43 g/L, and 49.6% of the women were found to be anaemic. Women of the age group 20-24 years, are at high risk of anaemia [P = 0.320, O.R. (95% C.I.) = 1.509 (0.671, 3.390)]. Conclusion: Pregnant, under nutritious, and poorest women are at high risk of anaemia. Urban women are also at high risk; however, higher educated women are at low risk of anaemia. The habit of cigarette smoking/pan/bidi/gutka etc. also increases the risk of anaemia. © TÜBİTAK.


Pala E.M.,Shillong College
Journal of Advanced Microscopy Research | Year: 2014

Scanning electron microscopy of skin of Channa gachua from polluted site of the hill stream Umkhrah, showed lesions of the epithelium and dead tissue debris. The other abnormal features of the skin included necrosis of the epidermis and highly eroded skin surface. Transmission Electron Microscopy of Skin in pollution exposed fish, revealed breakage of the epidermis with indistinct arrangement of the layers and loss of cellularity. Epithelial cells showed degenerating nuclear chromatin, a very high degree of distortion of the membrane and the presence of vacuolated cytoplasm. Distorted shape of epidermal nucleus with condensed nuclear chromatin material as well as breakage of nuclear envelope was also seen. The surface micro structural and fine structural abnormalities in the skin of pollution exposed C. gachua are discussed with the help of available literature. Copyright © 2014 American Scientific Publishers All rights reserved.

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