VINOD KUMAR NIGAM
Articles written in Journal of Biosciences
Volume 44 Issue 5 October 2019 Article ID 0124 Article
A total of 41 isolates were obtained from various samples (soil, mud, and water) of Surajkund hot spring, Jharkhand, atthree different isolation temperatures of 50 deg C, 60 deg C, and 70 deg C. However, our interest was in the thermophilic strains thatwere isolated at 60 deg C and 70 deg C. Four isolates at 70 deg C (BITSNS038, BITSNS039, BITSNS040, BITSNS041) are theproducers of thermozymes, namely amylase, xylanase, and cellulase, respectively. The highlights of the present study alsoshowed that three out of four isolates demonstrated all three enzymatic activities, i.e. amylolytic, xylanolytic and cellulolyticon agar plate assay conditions at 70 deg C. One of the isolates, BITSNS038, was further chosen for phenotypiccharacterization as well as 16S rRNA gene sequencing and was affiliated to Geobacillus icigianus. The presence ofGeobacillus icigianus was reported first time from hot spring, Surajkund, which showed amylolytic index of 1.58,xylanolytic index of 1.5 and cellulolytic index of 2.3 based on plate assay, and amylase activity of 0.81 U/mL, xylanaseactivity of 0.72 U/mL and very less cellulase activity of 0.15 U/mL after 24 h of growth in submerged conditions. Oneisolate at 60 deg C BITSNS024 was found to exhibit maximum amylase activity with an enzymatic index value of 3.5 and wasidentified as Anoxybacillus gonensis.
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