Document Detail

The oxygen transfer rate influences the molecular mass of the alginate produced by Azotobacter vinelandii.
MedLine Citation:
PMID:  17598106     Owner:  NLM     Status:  MEDLINE    
The influence of oxygen transfer rate (OTR) on the molecular mass of alginate was studied. In batch cultures without dissolved oxygen tension (DOT) control and at different agitation rates, the DOT was nearly zero and the OTR was constant during biomass growth, hence the cultures were oxygen-limited. The OTR reached different maximum levels (OTR(max)) and enabled to establish various relative respiration rates. Overall, the findings showed that OTR influences alginate molecular mass. The mean molecular mass (MMM) of the alginate increased as OTR(max) decreased. The molecular mass obtained at 3.0 mmol l(-1) h(-1) was 7.0 times higher (1,560 kDa) than at 9.0 mmol l(-1) h(-1) (220 kDa). An increase in molecular mass can be a bacterial response to adverse nutritional conditions such as oxygen limitation.
A Díaz-Barrera; C Peña; E Galindo
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-06-28
Journal Detail:
Title:  Applied microbiology and biotechnology     Volume:  76     ISSN:  0175-7598     ISO Abbreviation:  Appl. Microbiol. Biotechnol.     Publication Date:  2007 Sep 
Date Detail:
Created Date:  2007-08-29     Completed Date:  2007-11-13     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8406612     Medline TA:  Appl Microbiol Biotechnol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  903-10     Citation Subset:  IM    
Departamento de Ingeniería Celular y Biocatálisis, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Apdo. Post. 510-3, Cuernavaca, 62250, Morelos, Mexico.
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MeSH Terms
Alginates / chemistry,  metabolism*
Azotobacter vinelandii / metabolism*
Industrial Microbiology / methods*
Molecular Weight
Oxygen / metabolism*
Reg. No./Substance:
0/Alginates; 7782-44-7/Oxygen

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