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Isolation of A Marine Purple Non-Sulfur Photosynthetic Bacterium With A High Ability of Glycerol Assimilation

Author(s): Nao Yamauchi, Aoi Koga, Hiroshi Okuhata, Satoshi Tanaka, Naoki Yamada, Takaaki Maki, Shuhei Hayashi, Shinjiro Yamamoto, Hitoshi Miyasaka

Conversion of glycerol, a by-product of biodiesel production, into value-added materials increases the cost-effectiveness of biodiesel production. Purple nonsulfur photosynthetic bacteria (PNSB) are microorganisms that have been safely applied to various fields, such as agriculture, aquaculture, dairy farming, wastewater treatment, fine chemical production, and bioenergy production. The use of PNSB that efficiently assimilate glycerol is a promising approach to the value-added utilization of glycerol. In this study, we isolated 40 PNSB strains from seashore sediment, and examined their abilities in assimilate glycerol. One strain grew well with glycerol as a sole carbon source, and this strain was designated Rhodovulum sulfidophilum OKHT16 based on its 16S rRNA sequence. R. sulfidophilum OKHT16 showed the highest growth rate between 37 °C and 40 °C with a doubling time of 72 minutes, and the thermo-tolerance of this strain was up to 48 °C.

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