Abstract：
:pH affected significantly the growth and the glucose fermentation pattern of Propionibacterium microaerophilum. In neutral conditions (pH 6.5-7.5), growth and glucose fermentation rate (qs) were optimum producing propionate, acetate, CO(2), and formate [which together represented 90% (wt/wt) of the end products], and lactate representing only 10% (wt/wt) of the end products. In acidic conditions, propionate, acetate, and CO(2) represented nearly 100% (wt/wt) of the fermentation end products, whereas in alkaline conditions, a shift of glucose catabolism toward formate and lactate was observed, lactate representing 50% (wt/wt) of the fermentation end products. The energy cellular yields ( Y(X/ATP)), calculated (i) by taking into account extra ATP synthesized through the reduction of fumarate into succinate, was 6.1-7.2 g mol(-1). When this extra ATP was omitted, it was 11.9-13.1 g mol(-1). The comparison of these values with those of Y(X/ATP) in P. acidipropionici and other anaerobic bacteria suggested that P. microaerophilum could not synthesize ATP through the reduction of fumarate into succinate and therefore differed metabolically from P. acidipropionici.
journal_name
Curr Microbioljournal_title
Current microbiologyauthors
Koussémon M,Combet-Blanc Y,Ollivier Bdoi
10.1007/s00284-002-3839-xkeywords:
subject
Has Abstractpub_date
2003-02-01 00:00:00pages
141-5issue
2eissn
0343-8651issn
1432-0991journal_volume
46pub_type
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