Document Detail


Triggers of Aggregation and Extracellular Polysaccharide Polymer Production in Acidovorax temperans.
MedLine Citation:
PMID:  23325034     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Bacterial aggregation has important implications for the maintenance of bacteria in engineered environments. The triggers for aggregation, however, are poorly understood. A strain of Acidovorax temperans CB2Hn isolated from activated sludge was found to exhibit transient aggregation and was applied as a model to investigate factors that regulate biological aggregation. Growth kinetic studies indicate CB2Hn has exponential growth rates (μ (max)) ranging from 0.11 to 0.75 (log(CFU mL(-1))h(-1)) depending on nutrient conditions. CB2Hn exhibited variable aggregation in growth media that differed in the type of available carbon. Aggregation indices and extracellular polysaccharide polymer levels showed transient maxima which occurred at different points in the growth curve for each medium type. Maximum aggregation points were detected at the beginning of log phase in media containing complex carbon sources. In contrast, maximum values were detected in early log phase and mid-to-late log phase in media containing both simple and complex carbon sources. The results suggest that aggregation is regulated by nutritional cues and is possibly triggered by the switch to utilisation of complex carbon substrates.
Authors:
G A Clark Ehlers; Susan J Turner
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-17
Journal Detail:
Title:  Current microbiology     Volume:  -     ISSN:  1432-0991     ISO Abbreviation:  Curr. Microbiol.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-17     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7808448     Medline TA:  Curr Microbiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
The Centre for Microbial Innovation, School of Biological Sciences, The University of Auckland, Private Bag 92019, Auckland, New Zealand, c.ehlers@auckland.ac.nz.
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