Document Detail

Commensalistic Interaction Between Lactobacillus acidophilus and Propionibacterium shermanii.
MedLine Citation:
PMID:  16346098     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Propionibacterium shermanii and Lactobacillus acidophilus were grown in batch mixed culture in a 5-liter fermenter under controlled conditions of pH 5.8 and 35 degrees C on a semisynthetic medium with glucose as an energy source. Cellular efficiencies and fermentation balances were developed for this pair and compared with P. shermanii grown in pure culture on glucose, lactate, and a mixture of these substrates and with L. acidophilus grown on glucose. P. shermanii had ATP yield coefficient values of 17 for each substrate alone but had an average value of 30 for substrate mixtures. Growth rates were similar for P. shermanii on glucose or lactate but higher cell yields were observed for glucose. P. shermanii used both lactate and glucose in mixed substrate until lactate was exhausted, and growth rates slowed thereafter. L. acidophilus had a similar ATP yield coefficient of 15 but produced lower cell yields than did P. shermanii on glucose. Mixed culture of both microorganisms on glucose resulted in much faster and nearly equal growth rates for both and no lactate accumulation in the medium. Acetic acid production rates per generation were lower in mixed culture, suggesting use by the growing culture. The cause of the synergistic effect was not determined but may be due to the rapid production and removal of lactate or CO(2) enhancement in mixed culture.
J A Liu; N J Moon
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Applied and environmental microbiology     Volume:  44     ISSN:  0099-2240     ISO Abbreviation:  Appl. Environ. Microbiol.     Publication Date:  1982 Sep 
Date Detail:
Created Date:  2010-06-25     Completed Date:  2010-06-25     Revised Date:  2010-09-20    
Medline Journal Info:
Nlm Unique ID:  7605801     Medline TA:  Appl Environ Microbiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  715-22     Citation Subset:  -    
Department of Food Science, University of Georgia Agricultural Experiment Station, Experiment, Georgia 30212.
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