Affiliation:
1. Department of Biosciences, Tokyo University of Agriculture, Setagaya-ku, Tokyo 156-8502, Japan
Abstract
ABSTRACT
We investigated the effects of O
2
on
Bifidobacterium
species using liquid shaking cultures under various O
2
concentrations. Although most of the
Bifidobacterium
species we selected showed O
2
sensitivity, two species,
B. boum
and
B. thermophilum
, demonstrated microaerophilic profiles. The growth of
B. bifidum
and
B. longum
was inhibited under high-O
2
conditions accompanied by the accumulation of H
2
O
2
in the medium, and growth was restored by adding catalase to the medium.
B. boum
and
B. thermophilum
grew well even under 20% O
2
conditions without H
2
O
2
accumulation, and growth was stimulated compared to anoxic growth. H
2
O-forming NADH oxidase activities were detected dominantly in cell extracts of
B. boum
and
B. thermophilum
under acidic reaction conditions (pH 5.0 to 6.0).
Publisher
American Society for Microbiology
Subject
Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology
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