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Articles by R. Gaur
Total Records ( 3 ) for R. Gaur
  V.K. Gupta , R. Gaur , N. Gautam , P. Kumar , I.J. Yadav and N.S. Darmwal
  The purpose of this study was to characterization of xylanase producing Fusarium solani isolate and optimization of cultural conditions for xylanase enzyme production. Screening of Fusarium solani isolate was based on the diameter of the clear zone formation in oat spelt xylan agar plates, Fusarium solani isolate F7 was selected and optimized for xylanase enzyme production using cheaper substrate like wheat straw, rice straw, rice bran and wood husk. Maximum enzyme activity was observed in wheat straw (78.32 U mL-1). Optimum pH and temperature for xylanase activity were found to be 5.5 and 30° at 3% substrate concentration. In purification step, 75% ammonium sulphate saturation was found to be suitable giving maximum xylanase activity. Purified xylanase yielded single band with a molecular weight of 89 kDa. The use of wheat straw as a major carbon source is particularly valuable because oat spelt xylan is very expensive, The Fusarium solani F7 isolate proved to be a promising microorganism for xylanase production.
  P.K. Jain , V.K. Gupta , A.K. Misra , R. Gaur , V. Bajpai and S. Issar
  Fungi are extremely versatile class of organisms comprised mostly of saprophytes, grows on dead organic material. A relatively small number of fungal species have developed a parasitic lifestyle, associated with the ability to recognize and penetrate a specific host, exploit its nutrient reserves, overcome its innate defense responses and cause disease. Many organisms attacked by fungi encompasses evolutionary distinct groups from lower to higher eukaryotes, most prominently plants, insects and mammals, including humans. To cause disease, fungal pathogens rely on an arsenal of pathogenicity and virulence factors, which’s spatially and temporally correct deployment determines the basic pathogenic potential and the extent of infection, respectively. Being a common contaminant and a well-known plant pathogen, Fusarium sp. may cause various infections in humans. Fusarium is one of the emerging causes of opportunistic mycoses to human and animal. Up to date, approximate 15 species had been reported to cause human and animal diseases. Common species includes species are F. Solani (commonest), F. oxysporum, F. verticoides, F. proliferatum and F. anthophilum.
  Bhupander Kumar , R. Gaur , G. Goel , Meenu Mishra , Dev Prakash , S.K. Singh , R.B. Lal , Sanjay Kumar and C.S. Sharma
  A study was conducted to assess the levels of organic pollutants i.e. organochlorine pesticides, (OCPs), organophosphate pesticides (OPPs) and herbicides, in sediments from nine major municipal drains in Delhi, India. Sediment samples from Delhi’s municipal drains were extracted with acetone/dichloromethane (1:1v/v) and analyzed using GC and HPLC. The average concentration of ∑OCPs, ∑OPPs and ∑herbicides was 27.26±9.7 ng g-1 (dry wt.), 80.89±22.4 ng g-1 (dry wt.) and 16.20±4.45 ng g-1(dry wt.), respectively. Among OCPs ∑HCH alone accounts 63% followed by ∑DDT (16%), ∑endosulphan (13%) and drins 8%. The ratio of p,p’-DDT/∑DDT (0.23), p,p’-DDT/p,p’-DDE (0.26) and o,p’-DDT/p,p’-DDT (<0.01) indicates the aged mixture or past usage of DDT and no dicofol type DDT. Among OPPs Chlorpyriphos was the dominant pollutant with 89% of total OPPs. Pendimethalin accounts 77% of total herbicides followed by Butachlor (14%) and Alachlor (9%). The level of herbicides, OCPs and OPPs in this study were compared with Canadian Sediment Quality Guidelines, Interim Sediment Quality Guidelines (ISQG) and Probable Effect Level (PEL) and found much lower than fresh water sediment guideline values. However, it is recommended that regular intensive assessment for persistent organic pollutants and heavy metals to be conducted, due to environmental concerns.
 
 
 
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