Affiliation:
1. Department of Applied Chemistry, Faculty of Engineering, Utsunomiya University, Utsunomiya 321-8585, Japan
Abstract
ABSTRACT
Thirty-two strains of nonflocculating bacteria isolated from sewage-activated sludge were tested by a spectrophotometric assay for their ability to coaggregate with one other in two-membered systems. Among these strains, eight showed significant (74 to 99%) coaggregation with
Acinetobacter johnsonii
S35 while only four strains coaggregated, to a lesser extent (43 to 65%), with
Acinetobacter junii
S33. The extent and pattern of coaggregation as well as the aggregate size showed good correlation with cellular characteristics of the coaggregating partners. These strains were identified by sequencing of full-length 16S rRNA genes.
A. johnsonii
S35 could coaggregate with strains of several genera, such as
Oligotropha carboxidovorans
,
Microbacterium esteraromaticum
, and
Xanthomonas
spp. The role of
Acinetobacter
isolates as bridging organisms in multigeneric coaggregates is indicated. This investigation revealed the role of much-neglected nonflocculating bacteria in floc formation in activated sludge.
Publisher
American Society for Microbiology
Subject
Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology
Cited by
122 articles.
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