Abstract
Abstract
Hy.dro.gen.o.an.ae.ro.ba.te'ri.um. N. Gr. n.
hydrogenon
hydrogen; Gr. pref.
an
‐ without; Gr. n.
aer
air; Gr. neut. n.
baktron
a small rod; N.L. neut. n.
Hydrogenoanaerobacterium
an anaerobic, hydrogenogenic, rod‐shaped bacterium.
Firmicutes / Clostridia / Clostridiales / Oscillospiraceae / Hydrogenoanaerobacterium
The genus
Hydrogenoanaerobacterium
was proposed in 2009 to accommodate an obligately anaerobic bacterium that grouped with members of the family
Oscillospiraceae
affiliated with the phylum
Firmicutes
. However, the genus is differentiated from the other recognized genera of the family
Oscillospiraceae
phylogenetically and phenotypically. Cells of the genus
Hydrogenoanaerobacterium
are rods and occur singly or in pairs, and no spores are found. Although Gram‐negative staining was found for the cells throughout the whole exponential growth phase, the ultrastructure of the cell revealed an atypical Gram‐positive cell wall. The bacterium grows anaerobically, mesophilic and neutrophilically. The cellular fatty acids consist mainly of saturated and iso‐branched fatty acids, with C
14:0
, iso‐C
15:0
, C
16:0
, and iso‐C
17:1
ω9
c
being predominant. Metabolically, various mono‐, di‐, and oligo‐saccharides are fermented, and the major end products from glucose are ethanol, acetate, hydrogen gas, and carbon dioxide.
Hydrogenanoaerobacterium saccharovorans
is the only described species of the genus, which was isolated from a lab‐scale H
2
‐producing up‐flow anaerobic sludge blanket (UASB) reactor.
DNA G + C content (mol%)
: 41.9 ± 0.5 (
T
m
).
Type species
:
Hydrogenanoaerobacterium saccharovorans
Song and Dong 2009
VP
.