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1 Departamento de Bioquímica, Universidade de Coimbra, 3000 Coimbra, Portugal
3 Departamento de Zoologia, Universidade de Coimbra, 3000 Coimbra, Portugal
2 Bereich Mikrobiologie, Gesellschaft für Biotechnologische Forschung, 38124 Braunschweig, Germany
4 Centre for Applied Microbiology and Research. Porton Down, Salisbury, Wiltshire SP4 0JG, United Kingdom
* Corresponding author. Phone: 351-39-29802. Fax: 351-39-26798. Electronic mail address: Milton{at}gemini.ci.uc.pt.
ABSTRACT
One strain of a thermophilic, slightly halotolerant bacterium was isolated from a thermally polluted industrial runoff near Salisbury, United Kingdom. This organism, strain PRD-1T (T = type strain), for which we propose the name Rubrobacter xylanophilus sp. nov., produces short gram-positive rods and coccoid cells and forms pink colonies. The optimum growth temperature is approximately 60°C. Unusual internal branched-chain fatty acids (namely, 12-methylhexadecanoic acid and 14-methyloctadecanoic acid) make up the major acyl chains of the lipids. The results of our 16S rRNA sequence comparisons showed that strain PRD-1T is related to Rubrobacter radiotolerans and that these two organisms form a deep evolutionary line of descent within the gram-positive Bacteria.
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