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Bajracharya G.B.,Nepal Academy of Science and Technology NAST
Fitoterapia | Year: 2015

Bergenin, a natural secondary metabolite, has been isolated from different parts of a number of plants. It is one of active ingredients in herbal and Ayurvedic formulations. It exhibits antiviral, antifungal, antitussive, antiplasmodial, antiinflammatory, antihepatotoxic, antiarrhythmic, antitumor, antiulcerogenic, antidiabetic and wound healing properties. It has been analyzed and estimated in different plant extracts, blood and drug samples using chromatographic techniques, and pharmacokinetic studies have been made. Several bergenin derivatives were isolated and/or synthesized and were found to possess pharmacological activities. Total synthesis of bergenin and its derivatives were reported. This review article covers literature on bergenin and its derivatives until 2013. Ethnomedicinal value of bergenin containing plant materials is also highlighted. This comprehensive review provides information on the potentiality of bergenin and its derivatives for therapeutic usages. © 2015 Published by Elsevier B.V. Source

Conway K.W.,Texas A&M University | Mayden R.L.,Saint Louis University | Shrestha J.,Nepal Academy of Science and Technology NAST | Edds D.R.,Emporia State University
Ichthyological Exploration of Freshwaters | Year: 2012

Psilorhynchus pseudecheneis is redescribed based on examination of 120 specimens, 16-103 mm SL. It is distinguished from all congeners by its higher number of unbranched pectoral-fin rays and lateral-line scale rows, lower number of circumpeduncular scale rows, absence of scales from the dorsal midline between occiput and mid-point between occiput and dorsal-fin origin, and the presence of large flap-like structures supported by highly modified cycloid scales along the ventral surface of the body between the insertion of the paired fins. Comments on P. homaloptera are also provided. © 2012 by Verlag Dr. Friedrich Pfeil, München, Germany. Source

Lee D.Y.,Hanyang University | Yoon S.J.,Hanyang University | Shrestha N.K.,Hanyang University | Shrestha N.K.,Nepal Academy of Science and Technology NAST | And 3 more authors.
Microporous and Mesoporous Materials | Year: 2012

In this communication, we explore the cobalt based metal-organic-frameworks (Co-MOF) as a promising material for supercapacitors. The doctor bladed Co-MOF film exhibits a good pseudocapacitor behavior with the specific capacitance up to 206.76 F g -1. The electrochemical redox switching is reversible perfectly for a long run which leads to the loss of only 1.5% in capacitance for 1000 electrochemical life cycle stability test. © 2011 Elsevier Inc. All rights reserved. Source

Giri A.,University of Natural Resources and Life Sciences, Vienna | Giri A.,Nepal Academy of Science and Technology NAST | Katzensteiner K.,University of Natural Resources and Life Sciences, Vienna
Mountain Research and Development | Year: 2013

Traditionally, agricultural systems in the Himalayan region of Nepal rely on livestock, forestry, and crop production. The extraction of litter, tree fodder, and grasses from the forest ensures a net movement of carbon (C) and nitrogen (N) from the forest to the agricultural land. This study assessed the sustainability of farming systems by computing the C and N input and output of the agroecosystem. The study was conducted in the buffer zone of Sagarmatha National Park in Nepal. A questionnaire survey, field measurements, and laboratory analysis of samples were used to determine the C and N inputs and fluxes in the systems. Forest litter is a major source of C and N for agricultural land, as is fodder from the forest fed to livestock (lopping of trees, grazing). Amounts that are fairly significant are supplied by human waste. To produce the average amount of 40 kg N ha-1 per year applied as compost, 25 kg N from forest litter, 23 kg N from forest fodder, 9 kg N from human waste, and 3.5 kg N from field grazing and straw are required. Losses are attributed to volatilization, denitrification, and leaching. Harvest residues amount to 14 kg N ha-1. Rather than discouraging the use of litter toilets, a modernized version of indigenous waste management and composting practices could reduce dependency on forests for fuelwood, fodder, and litter. To maintain the present fertility status, each household needs an estimated 2-5 ha of forest land. © International Mountain Society. Source

Pant B.R.,Nepal Academy of Science and Technology NAST | Airee B.S.,Siddhanath Science Campus
Water International | Year: 2010

The arsenic-removing capacity of some low-cost materials was tested by passing aqueous arsenic solutions (16 and 57 ppb) of pH 7 through materials packed in plastic buckets. It was found that the initial concentration of arsenic solutions and their retention time in adsorbents greatly affected the removal of arsenic from the aqueous solution. Maximum arsenic removal was observed when the packed materials were exposed to 16 ppb of arsenic solution. With 57 ppb of arsenic solution, arsenic removal was reduced on that of 16 ppb; however, the reduced arsenic concentration was close to the recommendations of the World Health Organization drinking water quality guidelines. © 2010 International Water Resources Association. Source

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