T epidimicrobium

Abstract

Te.pi.di.mi.cro'bi.um. L. adj. tepidus moderately warm; N.L. neut. n . microbium microbe; N.L. neut. n. Tepidimicrobium a microbe from a hot spring. Firmicutes / Clostridia / Clostridiales / Tissierellaceae / Tepidimicrobium The genus Tepidimicrobium consists of two described species, Tepidimicrobium ferriphilum and Tepidimicrobium xylanilyticum , which share 93.8% of 16S rRNA gene sequence similarity. Cells of Tepidimicrobium spp. are straight to slightly curved rods, 0.4–0.6 µm in diameter and 3.0–10.0 µm in length with Gram‐positive‐type cell wall. Cells occur singly or in short chains and exhibit tumbling motility due to peritrichous flagellation. May form terminal endospores. Members of the genus Tepidimicrobium are anaerobic, moderately thermophilic and neutrophilic. The temperature range for growth is 25–67°C. The pH range for growth is 5.5–9.5. Tepidimicrobium spp. grow organotrophically on a number of proteinaceous substrates, amino acids, and carbohydrates and reduce 9,10‐anthraquinone 2,6‐disulfonate, Fe(III) citrate, and thiosulfate. Ability to reduce elemental sulfur, fumarate, and selenite is variable. Do not use sulfate, selenate, or oxygen as electron acceptors. May survive exposure to gamma‐radiation at a dose of 5–10 kGy. Species of the genus Tepidimicrobium isolated from a freshwater hot spring and a thermophilic anaerobic digester. DNA G + C content (mol%) : 33–37 ( T m ). Type species : Tepidimicrobium ferriphilum Slobodkin, Tourova, Kostrikina, Lysenko, German, Bonch‐Osmolovskaya and Birkeland, 2006, 371 VP .