Identificador persistente para citar o vincular este elemento: http://hdl.handle.net/10553/50862
Título: Impact of acetate, pyruvate, and physiological state on respiration and respiratory quotients in Pseudomonas nautica
Autores/as: Roy, Sylvie O.
Packard, Ted T. 
Berdalet, Elisa
St-Amand, Liliane
Clasificación UNESCO: 251001 Oceanografía biológica
Palabras clave: CO2 production rates
O2 consumption rates
Isocitrate dehydrogenase
Respiratory electron transfer system
ETS, et al.
Fecha de publicación: 1999
Editor/a: 0948-3055
Publicación seriada: Aquatic Microbial Ecology 
Resumen: Physiological rates of CO2 production and O2 consumption, and the activities of isocitrate dehydrogenase (IDH) and the electron transfer system (ETS) were studied in the marine bacterium Pseudomonas nautica growing on acetate. In exponential growth, IDH and ETS activities were well coupled with CO2 production and O2 consumption rates, but in senescence they were uncoupled. Our results clearly show that under starvation conditions, IDH and ETS activities remained high even though their corresponding respiration rates dropped. The respiratory metabolism in the different physiological states of the acetate-grown cultures was compared with previous observations made in pyruvate-grown cultures. Time profiles of CO2 production and O2 consumption rates showed completely different respiratory fingerprints associated with the different carbon sources. Acetate-grown cultures showed an increase of respiratory quotients (RQ) in the senescence phase whereas in pyruvate-grown cultures it stayed close to 1.0. On both carbon sources, respiration to respiratory capacity ratios were constant in exponential phase and decreased to almost zero after carbon source exhaustion. Our results clearly show the impact of physiological state and carbon sources on bacterial respiration rates
URI: http://hdl.handle.net/10553/50862
ISSN: 0948-3055
DOI: 10.3354/ame017105
Fuente: Aquatic Microbial Ecology [ISSN 0948-3055], v. 17, p. 105-110
Colección:Artículos
miniatura
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