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Thermus oshimai sp. nov., Isolated from Hot Springs in Portugal, Iceland, and the Azores, and Comment on the Concept of a Limited Geographical Distribution of Thermus Species

Department of Biochemistry, Queen Mary and Westfield College, London, E1 4NS, United Kingdom

^* Corresponding author. Mailing address: Department of Biochemistry, Queen Mary and Westfield College, Mile End Road, London E1 4NS, United Kingdom. Phone: 0171-982-6337. Fax: 0181-983-0531. Electronic mail address: r.a.d.williams{at}qmw.ac.uk.

ABSTRACT

We examined aerobic, thermophilic, gram-negative bacteria that were isolated from hot springs in Portugal and were identified as Thermus strains and placed in phenetic groups on the basis of their phenotypic characteristics. We determined the composition of the peptidoglycan, identified the respiratory quinones, and determined the mean base composition of the DNA, and the levels of DNA-DNA homology were determined by both the filter hybridization and reassociation rate methods. Thermus aquaticus, Thermus brockianus, and Thermus filiformis were not detected in this collection of organisms, although three Thermus thermophilus strains were identified. We propose that the isolates that belonged to phenetic clusters E and F are members of a new species, Thermus oshimai; the type strain of T. oshimai is strain SPS17.

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