Table 1.

Phenotypic characteristics of strain TLO in comparison with phylogenetically closely related species

Feature	Strain TLO	T. thermohydrosulfuricus	T. siderophilus
Source	Geothermal spring	Extraction juices of beet sugar factory	Hydrothermal vent
Gram reaction	+	V	+
Spores	+	+	+
Temperature range (oC)	40–80	40–78	39–78
Optimum temperature (°C)	68–70	65–68	69–71
pH range	4.5–9	5–9	4.8–8.2
Optimum pH	6.3–6.8	6.9–7.5	6.3–6.5
DNA G + C content (mol%)	35.1	37.6	32
Reduction of arsenate	+	+a	+a
Growth substrates
Ribose	+	+	NR
Mannitol	W	Wa	V
Starch	+	+	+
Pectin	+	+	NR
Xylan	+	+	–
Carboxymethylcellulose	W	+	–
CO (up to 25% v/v)	+	–a	–b

Data for reference species were obtained from Klaushofer and Parkkinen (1965) and Slobodkin et al. (1999)

NR not reported, V variable, W weak

^aTested in this report; ^b Data from Gavrilov et al. (2003)