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Articles by Vibhuti Rai
Total Records ( 3 ) for Vibhuti Rai
  Anju Verma , Bishwajeet Thakur , Vibhuti Rai and Kamlesh Verma
  Canal irrigation was taken up as one of the most important way to irrigate crops in seasons when there is scarcity of water. The study area is under dense network of Sharda Sahayak canal which was commenced in 1972. The major areas in this canal command are now facing the problems of water logging and secondary salinity. The areas in the close vicinity of canal are permanently water logged. Most of the areas in close vicinity of main feeder canal are water submerged due to seepage from the canal and as we move away from the canal water table depth increases. The water table data is correlated with soil data for parameters like pH, EC, ESP, SAR and ESC. It shows that soil samples from the areas in close proximity of the canal have water table <3 mbgl (meters belowground level) have pH>10, Sodium Adsorption Ratio (SAR) >18 and Exchangeable Sodium Percentage (ESP) >20 is in the category of sodic land according to USDA classification. The locations away from the main canal have water table >5 mbgl have normal soil categorization with pH (7-9), SAR (<15) and ESP (<18). Soil profile data of all the parameters (EC, pH, soil texture, ESP, SAR) decreases with the depth profile indicating salts enrichment is pronounced in upper layer. Development of secondary salinity through capillary action due to evaporation is clearly indicated. Chemical analysis of the water samples are well within the permissible range of different cations and anions required for irrigation purpose. The problem of sodicity is not due to the inherent chemical nature of the water but developed by capillary action of water in the soil (through physical process).
  Yogita Rajput , Jayant Biswas and Vibhuti Rai
  The almost high and stable environmental factors always represent a subterranean cave as one of the most vulnerable environments on Earth. In such conditions, the microbial communities that survive definitely reveal strong antimicrobial and other relevant biological activities. In the present study, the antimicrobial activity and the antibiotic sensitivity of seven Streptomyces strains isolated from various depth dependent microhabitats of a subterranean cave has been tested. Antimicrobial activity was found maximum against E. coli than Staphylococcus aureus and Pseudomonas aeruginosa. Further, the strains isolated from the deeper habitats of the cave have revealed much antagonistic activities as compared to the strains of anterior habitats. Some interesting results have also been revealed from antibiotic sensitivity tests which altogether indicate the possibilities for occurrence of high potential Streptomyces strains from this particular cave, useful for biotechnological tools.
  Yogita Rajput , Vibhuti Rai and Jayant Biswas
  Bacterial communities are often found to play a major role in building the foundation of food chain in the food starved cave ecosystem. Earlier it was assumed that due to lack of direct external environmental impact the caves were an almost sterile ecosystem. But today, the ever increasing human activities inside it, in the form of ecotourism exert a major impact on its native microbes, often stopping its growth and polluting the whole ecosystem. The situation is often found to be responsible for producing some human pathogenic bacteria inside it, which might pose a threat of infection to the other tourists. Kotumsar cave is a well known tourist pulling limestone cave from central part of India which is also a harbour of various native cavernicoles. In the present study, the bacterial communities existing in different sediments of this cave were screened and identified. The growth rates of each isolate were also verified against various temperature ranges and the maximum growth was found to coincide with the annual mean temperature of the cave. Further, the impact of the same has been correlated with the existing biodiversity, geophysical factors and the human activities inside the cave. Finally, the probabilities of pathogenic threats to human beings due to the respective bacterial communities have also been discussed.
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