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International Journal of Systematic and Evolutionary Microbiology, Vol 52, 2155-2161, Copyright © 2002 by Society for General Microbiology
M. Y. Chen, S. S. Tsay, K. Y. Chen, Y. C. Shi, Y. T. Lin and G. H. Lin
Department of Botany, National Taiwan University, 106, Taipei, Taiwan
Two novel thermophilic bacterial strains, with an optimum growth temperature of between 50 and 60 degrees C, were isolated from the Chi-ban Hot Springs in eastern Taiwan. Strains CB-225 and CB-226(T) were aerobic, thermophilic, non-sporulating, yellow-pigmented heterotrophic organisms. These strains exhibited an unusual denitrification reaction, reducing nitrite, but not nitrate, with the production of N(2)O only. On the basis of a phylogenetic analysis of 16S rDNA sequences, DNA--DNA similarity data, morphological, physiological and biochemical characteristics, and fatty acid compositions, it was found that the novel strains belonged to the genus Pseudoxanthomonas and represented a novel species within this genus, for which the name Pseudoxanthomonas taiwanensis is proposed; the type strain is CB-226(T) (=ATCC BAA-404(T)=CCRC 17172(T)). P. taiwanensis differs from the only member of the genus Pseudoxanthomonas, the mesophilic species Pseudoxanthomonas broegbernensis, in that it exhibits a higher growth temperature and different morphological characteristics, such as the absence of polar flagella.
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