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	STUDIA BIOLOGIA - Ediţia nr.1 din 2019

	Articol:	BIOSYNTHESIS OF SELENIUM NANOPARTICLES BY HALOFERAX ALEXANDRINUS GUSF-1 (KF796625) AND THEIR USE IN MODULATING THE SIZE AND SHAPE OF CALCIUM OXALATE CRYSTALS. Autori: JYOTHI J. ALVARES, IRENE J. FURTADO.


	Rezumat: The ability to resist and biotransform toxic metalloids and chalcogens though widespread among prokaryotes is relativley less explored among the archaeal domain (Srivastava and Kowshik, 2013). In this study, a haloarchaeon, Haloferax alexandrinus GUSF-1 (KF796625) isolated from solar saltern of Goa – India grew optimally at 25% NaCl and was resistant to 120 mM concentration of toxic selenite (SeO₃^2-), with formation of deep red particulate matter in 4 days. Whole cells incubated with SeO₃^2- also gave the red particulate matter. SEM-EDX of the red material exhibited absorption peaks at 1.5, 11.2, and 12.5 keV thus indicating the presence of selenium. Further, the 8 diffraction peaks between 23 and 62 θ in XRD, corresponding to planes at (100), (101), (110), (012), (111), (201), (112) and (022) matched with those for selenium (Se⁰) in JCPDS card No. 073-0465. TEM micrograph revealed rhombic shaped nanoparticles with capping material. The SeNPs at 100 µg/mL were able to substantially modulate the size and hexagonal shape of the calcium oxalate crystals to smooth spheres. Conclusively, this study gives an important lead for harnessing the potential of Haloferax alexandrinus GUSF-1 (KF796625) for biogenic synthesis of Se⁰ from SeO₃^2- and for exploring the possible use of Se⁰ in pharmaceutical application. Keywords: calcium oxalate crystals, haloarchaeon, Haloferax, selenium nanoparticles




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