Data/hora: 17/06/2024 13:08:28

Provedor de dados: | 5
País: | France
Título: | Production of exopolysaccharides by Antarctic marine bacterial isolates
Autores: | Nichols, C; Garon, Sandrine; Bowman, J; Raguenes, Gerard; Guezennec, Jean.
Data: | 2004-05
Ano: | 2004
Palavras-chave: | Sea ice; Pseudoalteromonas spp.; Particulate organic material; Exopolysaccharides; Antarctic marine bacteria.
Resumo: | Aims: This study was undertaken to examine and characterize Antarctic marine bacterial isolates and the exopolysaccharides (EPS) they produce in laboratory culture.   Methods and Results: Two EPS-producing bacterial strains CAM025 and CAM036 were isolated from particulate material sampled from seawater and sea ice in the southern ocean. Analyses of 16S rDNA sequences placed these isolates in the genus Pseudoalteromonas. In batch culture, both strains produced EPS. The yield of EPS produced by CAM025 was 30-fold higher at -2 and 10degreesC than at 20degreesC. Crude chemical analyses showed that these EPS were composed primarily of neutral sugars and uronic acids with sulphates. Gas chromatographic analysis of monosaccharides confirmed these gross compositional findings and molar ratios of monosaccharides revealed differences between the two EPS.   Conclusions: The EPS produced by Antarctic bacterial isolates examined in this study appeared to be polyanionic and, therefore, 'sticky' with respect to cations such as trace metals.   Significance and Impact of the Study: As the availability of iron as a trace metal is of critical importance in the southern ocean where it is know to limit primary production, the role of these bacterial EPS in the Antarctic marine environment has important ecological implications.
Tipo: | Text
Idioma: | Inglês

Identificador:

https://archimer.ifremer.fr/doc/2004/publication-629.pdf

DOI:10.1111/j.1365-2672.2004.02216.x

https://archimer.ifremer.fr/doc/00000/629/

Editor: | Blackwell science
Formato: | application/pdf
Fonte: | Journal of Applied Microbiology (1364-5072) (Blackwell science), 2004-05 , Vol. 96 , N. 5 , P. 1057-1066

Fonte:

2004 Blackwell Publishing, Inc.

info:eu-repo/semantics/openAccess

restricted use