Effects of oxygen on Pseudomonas nautica growth on n-alkane with or without nitrate

摘要: The denitrifying marine bacterium, Pseudomonas nautica 617, can grow on lactate aerobically or anaerobically in presence of nitrate with generation times 1.5 and 3 h respectively. growth heptadecane occurs only oxygen whatever its concentration a genrration time 8.5 h. influence oxygen, carbon sources (lactate heptadecane) was examined O2, NO3-, NO2- consumption, nitrite reductases activities, cell yields, the ratio CO2 produced per unit biomass. metabolizes hydrocarbons under conditions oxygen. Nitrate are used during up to concentrations corresponding 50 30% air-saturation, When n-alkane not oxygen-limited (above 50% air-saturation) catabolism decreases favour incorporation into cell. were strongly inhibited after 20% airsaturation as substrate. With n-alkane, reductase activity greatly reduced.