Data/hora: 06/06/2024 08:02:05

Provedor de dados: 	5	
País: 	France	
Título: 	Mesophilic sulfate-reducing bacteria from 3 deep-sea hydrothermal vent sites	
Autores: 	Elsgaard, L; Guezennec, J; Benbouzidrollet, N; Prieur, D.	
Data: 	1995	
Ano: 	1995	
Resumo: 	The present study was conducted to determine the presence and physiology of mesophilic sulfate-reducing bacteria (SRB) at deep-sea hydrothermal vents, which constitute remote ecosystems, largely dependent on their own chemoautotrophic primary production. SRB were enriched and isolated from samples of hydrothermal water, invertebrates, chimneys, and sediment collected at deep-sea (1700 to 2600 m) hydrothermal vent sites in the Lau Basin, in the North Fiji Basin, and at 13 degrees N on the East Pacific Rise. From the hydrothermal fields in the Lau Basin and the North Fiji Basin, SRB were cultured at 30 degrees C from 19 out of 21 samples, including five samples of high-temperature hydrothermal water (&gt; 100 degrees C). Acetate, benzoate, formate, isobutyrate, and lactate were supplied as single electron donors and could all be degraded by SRB. From the site at 13 degrees N, SRB were enriched at 20 or 40 degrees C from seven out of 20 samples. Two Desulfovibrio. strains, H 2.5 and H 5.3, originated from the tubes of the polychaete Alvinella sp. and these strains had optimum temperatures at 37 to 40 degrees C with doubling times of 3.6 and 6.6 hours, respectively. In cultures of strain H 2.5, which had reached the stationary growth phase, almost the entire populations (&gt; 99%) changed into round pleomorphs (coccoid bodies). However, cultures of vibrio-shaped bacteria were recovered upon transfer of an inoculum to fresh medium. No distinct changes in the composition of the cell membrane phospholipid fatty acids were associated with the morphological transformation. In the deep-sea hydrothermal vent environment, mesophilic SRB occurred frequently and may thrive in anoxic habitats in association with warm vent animal communities.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	http://archimer.ifremer.fr/doc/00097/20861/18479.pdf	
Editor: 	Gauthier-Villars	
Relação: 	http://archimer.ifremer.fr/doc/00097/20861/	
Formato: 	application/pdf	
Fonte: 	Oceanologica Acta (0399-1784) (Gauthier-Villars), 1995 , Vol. 18 , N. 1 , P. 95-104