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Applied and Environmental Microbiology, April 2000, p. 1286-1291, Vol. 66, No. 4
Division of Applied Life Sciences, Graduate
School of Agriculture, Kyoto University, Kyoto
606-8502,1 and Department of Ecological
Engineering, Toyohashi University of Technology, Toyohashi
441-8580,2 Japan
Received 25 October 1999/Accepted 6 January 2000
Two kinds of phenol-degrading denitrifying bacteria,
Azoarcus sp. strain CC-11 and spiral bacterial strain
CC-26, were isolated from the same enrichment culture after 1 and 3 years of incubation, respectively. Both strains required ferrous ions
for growth, but strain CC-26 grew better than strain CC-11 grew under
iron-limited conditions, which may have resulted in the observed change
in the phenol-degrading bacteria during the enrichment process. Strain CC-26 grew on phenol, benzoate, and other aromatic compounds under denitrifying conditions. Phylogenetic analysis of 16S ribosomal DNA
sequences revealed that this strain is most closely related to a
Magnetospirillum sp., a member of the
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Isolation and Characterization of a New
Denitrifying Spirillum Capable of Anaerobic Degradation of
Phenol
subclass of the
class Proteobacteria, and is the first strain of a
denitrifying aromatic compound-degrading bacterium belonging to this
group. Unlike previously described Magnetospirillum
strains, however, this strain did not exhibit magnetotaxis. It grew on
phenol only under denitrifying conditions. Other substrates, such as
acetate, supported aerobic growth, and the strain exhibited
microaerophilic features.
*
Corresponding author. Mailing address: Division of
Applied Life Sciences, Graduate School of Agriculture, Kyoto
University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan. Phone:
81-75-753-6385. Fax: 81-75-753-6385. E-mail:
nkato{at}kais.kyoto-u.ac.jp.
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