%A Li Yaqin, Zhoung Huifang, Liu Guozhen %T Isolation and characterization of moderately thermophilic sulfur - oxidizing bacteria %0 Journal Article %D 1993 %J Biodiv Sci %R 10.17520/biods.1993002 %P 9-15 %V 01 %N 1 %U {https://www.biodiversity-science.net/CN/abstract/article_7317.shtml} %8 1993-11-20 %X Moderately thermophilic sulfur-oxidizing bacteria resembling thiobacillus thiooxidans reffered to as MS (MS252,MS272,MS281,MS301) have been isolated from,acidic thermal habits in China. The optimum temperature for allculture appears to be 45℃; growth range is 25~55℃. The optimum pH is in the range of 3. 0~3. 5 ; growth rangeis 1. 0~5. 5 for strain MS252 and MS301, 1. 0~6. 0 for strain MS272 and MS281. The mol% G+C of the DNA is'57~60. The results indicate the strains MS have close relationship with Thiobacillus thiooxidans either obligateautotrophic or acidophilic. The latter has lower growth temperature (10~37℃ ) and lower mol % G+C of DNA(50~52). The new isolates Should be proposed as a new species of Thiobacillus thermothiooxidans sp. nov..