Data/hora: 08/06/2024 15:24:10

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