Data/hora: 01/06/2024 18:05:44

Provedor de dados: | 5
País: | France
Título: | Relations between bacterial extracellular enzyme activities and heterotrophic substrate uptake in a brackishwater environment.
Autores: | Hoppe, H.
Data: | 1984-10
Ano: | 1984
Palavras-chave: | Biogeochemistry; Fjords; Bacteria; Brackishwater environment; Seasonal variations; Dissolved organic matter; Interspecific relationships; Hydrolysis; Enzymes.
Resumo: | Extracellular enzymes mediate the decomposition of polymeric organic compounds in natural waters. In many cases these enzymes comprise a component linked to the bacterial fraction of the aquatic community and react in close association with these cells. An annual survey of microbial activities in a brackish water fjord exhibited an excellent correlation between V sub(m) of proteases (ability to split the substrate analogue methylumbelliferyl-leucine) and V sub(m) as well as T sub(R) for leucine uptake by microorganisms. Hydrolysis rates (H sub(R)) for the decomposition of naturally occurring competitive substrate analogues of the model substrates (methylumbelliferyl-(MUF)-leucine, MUF- alpha -D-glucose, MUF-N-acetyl-glucosamine, MUF-phosphate) drastically declined after chlorophyll a and bacterial abundance had dropped in autumn. H sub(R) for protease and phosphatase were higher in offshore areas than in polluted inshore waters, whereas the opposite was true for alpha -glucosidase and glucosaminidase.
Tipo: | Text
Idioma: | Inglês
Identificador: | http://archimer.ifremer.fr/doc/1984/acte-952.pdf
Editor: | Actes de colloques. Ifremer Brest [ACTES COLLOQ. IFREMER.]. 1986
Relação: | http://archimer.ifremer.fr/doc/00000/952/
Formato: | application/pdf