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Kālimpang, India

Som D.K.,Maulana Azad National Institute of Technology | Das N.,Kalimpong College | Hazra N.,University of Burdwan
Mitteilungen aus dem Museum fur Naturkunde in Berlin - Deutsche Entomologische Zeitschrift | Year: 2013

Metriocnemus clarivirgulus sp. n. belonging to the eurynotus (= obscuripes = hygropetricus) species group is described as adult male, female, pupa and larva. A possible placement and inclusion of the new species and Metriocnemus puna Donato and Siri in the key to known males and females of Metriocnemus van der Wulp of Sæther is proposed. Validity of previous Indian species is discussed. A brief account of biology with reference to larval dwelling, food and feeding, pupal activities, seasonal emergence, sex ratio, swarming, mating and oviposition of the new species is also described. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

Acharjee M.L.,Kalimpong College | Barat S.,North Bengal University
Journal of Environmental Biology | Year: 2010

Impact of fishing methods and gears used on fish faunal diversity in spring-fed torrential river Relli in Darjeeling hill area of West Bengal was investigated in the present study. The fish species available in the river provide nutrition and recreation (rarely income generating) fora large number of people residing along the river bank and nearby villages and towns. The fishing methods observed therein have been categorized as, i) Scientific fishing methods, that is, collection of required number and of fish remains balanced in the nature. ii) Unscientific fishing methods, that is, indiscriminate killing of large number of fish which adversely affect the water quality of rivers. Ten types of fishing methods are practiced in this area, for example, diversion of river channel, cast netting, scoop netting, angling, fish spearing, rock striking or hammering, dynamiting, electric fishing, river poisoning and traps utilized. Over the years uncontrolled and often indiscriminate fishing in the unmanaged hill-stream has resulted in a sharp decline in fish resources. The study gives a clear picture on the anthropogenic pressure on the river Relli and provides baseline data which may be helpful for conservation and management of the fish species and also formulating new fishery policy. © Triveni Enterprises, Lucknow (India). Source

Sinha B.,North Bengal University | Pradhan R.,St. Josephs College | Saha S.,Kalimpong College | Brahman D.,North Bengal University | Sarkar A.,North Bengal University
Journal of the Serbian Chemical Society | Year: 2013

Densities and viscosities of binary mixtures consisting of tetrahydrofuran (THF), 1,3-dioxolane (1,3-DO) and 1,4-dioxane (1,4-DO) with N,N- -dimethylformamide (DMF) over the entire range of composition were measured at the temperatures 298.15, 308.15 and 318.15 K and at atmospheric pressure. The ultrasonic speeds of sound of these binary mixtures were measured at ambient temperature and atmospheric pressure (T = 298.15 K and p = = 1.01×105 Pa). The various experimental data were utilized to derive the excess molar volumes E (Vm ) , excess viscosities (E) and excess isentropic compressibilities E (s ). Using the excess molar volumes E (Vm ) , the excess partial molar volumes ( E Vm,1 and E Vm,2 ) and excess partial molar volumes at infinite dilution ( 0,E Vm,1 and 0,E Vm,2 ) of each liquid component in the mixtures were derived and are discussed. The excess molar volumes E (Vm ) as a function of composition at ambient temperature and atmospheric pressure were used to test further the applicability of the Prigogine-Flory-Patterson (PFP) theory to the experimental binaries. The excess properties were found to be either negative or positive depending on the nature of molecular interactions and structural effects of the liquid mixtures. Copyright ©2013 SCS. Source

Saha S.,Kalimpong College | Brahman D.,North Bengal University | Sinha B.,Kalimpong College | Sinha B.,North Bengal University
Journal of the Serbian Chemical Society | Year: 2015

Two Cu(II) complexes of an ionic liquid based Schiff base 1-{2-[(2-hydroxybenzylidene)amino]ethyl}-3-methylimidazolium hexafluorophosphate, were prepared and characterized by different analytical and spectroscopic methods such as elemental analysis, magnetic susceptibility, UV-Vis, IR and NMR spectroscopy, and mass spectrometry. The Schiff base ligand was found to act as a potential bidentate chelating ligand with N, O donor sites and formed 1:2 metal chelates with Cu(II) salts. The synthesized Cu(II) complexes were tested for their biological activity. © 2015, Serbian Chemical Society. All rights reserved. Source

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