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Articles by V.K. Singh
Total Records ( 3 ) for V.K. Singh
  V.K. Singh , B.L. Mandhyan , Sheela Pandey and R.B. Singh
  A study was conducted using Lab Spray Dryer (LU-222 Advanced Model, Twin cyclone) to produce spray-dried Ber powder. Thirty two experiment were conducted keeping five different operating variables of spray dryer i.e., inlet temperature (170, 180, 190, 200 and 210°C), aspirator blower capacity (40, 50, 60, 70 and 80%) and feed pump capacity (9, 12, 15, 18 and 21%) and feed parameters i.e., maltodextrin concentration (4, 6, 8, 10 and 12%) as encapsulating material upon the biochemical properties (moisture content, acidity and ascorbic acid) of powder were observed. Analysis of experimental data i.e., Ber powder properties and process parameters yielded best quality (moisture content 3.9%, acidity 0.55% and ascorbic acid 38.4 mg/100 g) of powder at inlet air temperature 190°C, aspirator blower capacity 60%, feed pump capacity 15%, encapsulating material 8%.
  Shefali Srivastava , Anupam Pati Tripathi , V.K. Singh and D.K. Singh
  Snails of family Lymnaeidae act as an intermediate host of Fasciola species, which caused fasciolosis nearly in all the continents of world. Eugenol and quercetin are active molluscicides against snail Lymnaea acuminata. Laboratory evaluation is done to determine the effect of abiotic factors on the toxicity of these molluscicides in the year 2010-2011. Highest toxicity of eugenol (24 h LC50 10.03 mg L–1) and quercetin (24 h LC50 129.13 mg L–1) was observed in the month of May. Significant correlation was observed between LC50 values of eugenol and quercetin with temperature/pH/dissolved oxygen/carbon dioxide. In vivo acetylcholinesterase (AChE), alkaline phosphatase (ALP) and acid phosphatase (ACP) activity were measured in the nervous tissue of treated snails in each month of year 2010-2011.
  Preetee Jaiswal , Pradeep Kumar , V.K. Singh and D.K. Singh
  Areca catechu is a species of palm grown mainly in Asian countries for seed crop. The chemical constituents of A. catechu have been investigated for anti-nematodal/helmintic, antioxidant, anti-venom, modulation of phagocytosis, effect on sperm motility/catecholamine release, as immunosuppression, management of psychiatric disorder and Alzheimer’s disease. Recent studies have revealed strong molluscicidal activity of A. catechu against harmful snails for the control of fascioliasis. Despite its laboratory studies on nematocidal/helmintic/molluscicidal activity of A. catechu. More field studies are recommended for effective control of these pests. Alkaloid arecoline is the major constituents of A . catechu for most of their biological effects. A. catechu deserves more attention by scientific community and health experts to explore its full range of benefits in welfare of mankind. Adverse effects of oral ingestion of A. catechu, causing Oral Submucous Fibrosis (OSF), oral submucous cell carcinoma should be taken in consideration, while their use is recommended in solving different health problems.
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