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Dharwad, India

Shweta R.P.,Kamatak University | Shivanna N.,Kamatak University
Journal of Advanced Zoology | Year: 2011

Larval pupation site preference has been studied in Drosophila varians, D. texana, D. agumbensis, D. jambulina and D. brindavani belonging to different subgroups. The larvae of D. varians, D. agumbensis and D. jambulina preferred food media, D. texana preferred glass wall and D. brindavani preferred cotton for pupation.

Bhajantri R.F.,Kamatak University | Ravindrachary V.,Mangalore University | Lobo B.,Karnatak University | Pujari P.K.,Bhabha Atomic Research Center | And 4 more authors.
Journal of Physics: Conference Series | Year: 2015

Poly(vinylalcohol) (PVA)/Poly(vinylpyrrolidone) (PVP) blend films, doped with chalcone derivative (1-(4-methylphenyl)-3-(4-N,N,dimethylaminophenyl)-2-propen-1-one) (MPDMAPP) from 0.025 wt% up to 1 wt% were prepared using solution casting technique. The o-Ps lifetime τ3 is found to change little, from 1.61 ns at 0.025 wt% dopant concentration to 1.63 ns at 0.5 wt% dopant level, but drops to 1.4 ns at 1 wt% dopant concentration, indicating the onset of phase separation. The S-parameter of DBAR was found to be linearly related to the ortho-Positronium(o-Ps) intensity I3. The S-parameter drops significantly from 0.1 wt% up to 1 wt% doping concentration. This is supported by the XRD scans. © Published under licence by IOP Publishing Ltd.

Lobo B.,Kamatak University | Baraker B.M.,Kamatak University | Hammannavar P.B.,Kamatak University | Bhajantri R.F.,Karnatak University | And 3 more authors.
Journal of Physics: Conference Series | Year: 2015

Flexible films of pyrrole(Py) sorbed, ferric chloride (FeCl3) doped polyvinylalcohol(PVA) were prepared by solution casting. The films were characterized by XRD, UV-Visible spectrometry, Thermal Analysis (DSC, DTA/TGA), FTIR and electrical measurements. In this paper, the results of Doppler Broadening of Annihilation Radiation (DBAR) spectra in the doping range, from 4 wt% up to 18 wt%, are discussed. The XRD and DSC scans complement the DBAR results. The computed S-parameter and W-parameter reflect changes in the degree of crystallinity and the average crystallite size, respectively, of polypyrrole(PPy) incorporated PVA samples doped with ferric chloride. © Published under licence by IOP Publishing Ltd.

Mulla S.I.,Kamatak University | Talwar M.P.,Kamatak University | Hoskeri R.S.,Kamatak University | Ninnekar H.Z.,Kamatak University
Biotechnology and Bioprocess Engineering | Year: 2012

Nitroaromatic compounds are major chemical pollutants because of their widespread use and toxicity. Bioremediation of such toxic nitroaromatic compounds using microorganisms may provide an effective method for detoxification. Bacillus flexus strain XJU-4, capable of degrading 3-nitrobenzoate, was immobilized in various matrices, namely polyurethane foam (PUF), polyaciylamide, sodium alginate (SA), sodium alginate-polyvinyl alcohol (SA-PVA) and agar. The degradation of 12 and 24 mM 3-nitrobenzoate, by both freely suspended cells and immobilized cells, in batches and fed-batch with shaken cultures were compared. The PUF-immobilized cells achieved higher degradation rates of 12 and 24 mM 3-nitrobenzoate than freely suspended cells, and the cells immobilized in SA-PVA, polyacrylamide, SA and agar. The PUF-immobilized cells could be reused for more than 21 cycles without losing any degradation capacity. These results revealed the feasibility of using PUF-immobilized cells of B. flexus for the enhanced degradation of 3-nitrobenzoate. © The Korean Society for Biotechnology and Bioengineering and Springer 2012.

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