http://irgu.unigoa.ac.in/drs/handle/unigoa/3 2026-11-06T07:09:00Z http://irgu.unigoa.ac.in/drs/handle/unigoa/8123 Echis carinatus (Indian Saw-scaled Viper) Sawant, N.S.; Gawas, Mayur M. 2025-01-01T00:00:00Z http://irgu.unigoa.ac.in/drs/handle/unigoa/8120 Physico-chemical factors and nanomaterial-mediated optimization of pigment yield from a psychrotrophic marine Citricoccus-like isolate of an Arctic fjord Kaskar, R.; Tiwari, M.; Prabhu, M.S.; Kerkar, S.; Tiwari, D.K. Bacterial pigments have broad industrial applications and are relatively easy to scale up. However, Arctic microbial sources remain largely unexplored. In this study, we isolated a yellow-pigmented bacterium, PS104, from the Arctic Ny-Alesund fjord in Kongsfjorden, Svalbard, Norway. Biochemical assays and 16S rRNA gene sequencing revealed that PS104 is closely related to the genus Citricoccus. Pigment characterization using UV-visible spectroscopy showed a carotenoid-like profile with a three-shoulder absorption peak, while Fourier transform infrared (FT-IR) spectroscopy and high-resolution liquid chromatography mass spectrophotometry (HR-LCMS) analysis confirmed the presence of yellow carotenoid pigment consistent with zeaxanthin (C sub(40)H sub(56)O sub(2)), along with additional unidentified peaks. To enhance the pigment yield, we employed a multi-stage optimization strategy beginning with one-factor-at-a-time, followed by response surface methodology (RSM), which resulted in approx. 200 percent increases in pigment dry weight from 26 mg/100 mL to 78 mg/100 mL. Further supplementation of RSM media with TiO sub(2) nanomaterials provided an additional approx. 30 percent increase, achieving 102 mg/100 mL. Overall, the optimized conditions resulted in a approx. 3.9-fold improvement compared to basal media. Early findings demonstrate that MDCK cells exhibit no negative response to the pigment, highlighting its promise for textile dyeing applications. This research demonstrates the successful isolation of an Arctic Citricoccus-like strain and systematic optimization of its carotenoid pigment yield, providing preliminary evidence of its biotechnological potential, particularly for textile coloration. 2026-01-01T00:00:00Z http://irgu.unigoa.ac.in/drs/handle/unigoa/8118 Documentation, Biochemical Analysis, Bioprospecting and Molecular Phylogeny of Garcinia Species from the Western Ghats of India Palkar, Rutuja Satish 2021-11-01T00:00:00Z http://irgu.unigoa.ac.in/drs/handle/unigoa/8113 Molecular Characterization of Marine Bacteria and their Enzymes for Textile Azo Dye Decolorization de Souza, Nadine Ana 2024-07-01T00:00:00Z