Effect of pH and oxygen on growth and viability of Acetivibrio cellulolyticus

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DOIResolve DOI: http://doi.org/10.1099/00221287-125-1-41
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TypeArticle
Journal titleJournal of General Microbiology
Volume125
Pages4146; # of pages: 6
AbstractGrowth, hydrogen production and cellulose digestion by Acetivibrio cellulolyticus strain CD2 were considerably greater when the culture pH was maintained at 70 than when the pH was not controlled. Furthermore, if the pH of the growth medium was controlled the number of viable organisms was 6-fold greater after 3 d incubation and 100-fold greater after 6 d incubation compared with equivalent cultures in which the pH was not controlled. The differences were due to the combined effect of low pH values and acetic acid accumulation. The number of viable organisms was 2- to 3-fold lower after 12 h incubation in substrate-free medium containing 40 mm-acetic acid at pH 55 than in the same medium at pH 70. Addition of 90 mm-acetic acid during growth in a cellobiose-containing medium lowered the growth rate by 30% and the rate of hydrogen production by 40%. Exposure of A. cellulolyticus to oxygen for up to 2 h did not affect viability measurements provided that the organisms were subsequently transferred to reduced media.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada
Peer reviewedNo
NRC numberBREUIL1981
NPARC number9369372
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Record identifier46a4294e-e4b5-4fe6-8325-97282b54798d
Record created2009-07-10
Record modified2016-05-09
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