The Effect of Lowered Concentrations of Carbon,Nitrogen and Phosphorus Sources on the Growth Dynamics of the R,S, and M Dissociants of Pseudomonas aeruginosa |
| |
Authors: | Mil'ko E. S. Il'inykh I. A. |
| |
Affiliation: | (1) Faculty of Biology, Moscow State University, Vorob'evy gory, Moscow, 119899, Russia |
| |
Abstract: | The effect of lowered concentrations of carbon, nitrogen, and phosphorus sources in the medium on the specific growth rate of the R, S, and M dissociants of the hydrocarbon-oxidizing strain Pseudomonas aeruginosaK-2, culture pH, and the population composition was studied. Within the first 16 hours of cultivation in all of the four media tested, the R, S, and M dissociants have virtually identical . The maximal values of were reached by the 20th h of growth in the basal medium (R and S dissociants) and in the carbon-deficient medium containing 0.4% glucose (M dissociant). The R and M dissociants showed the most rapid decrease in in the nitrogen-deficient medium containing 0.55% NaNO3. By the end of cultivation in the basal medium, the pH of the R, S, and M cultures decreased to 6.3, 5.3, and 3.3, respectively. In the case of the carbon-deficient medium, the drop in the culture pH was lower. After a 2.5-day incubation of the S dissociant in the phosphorus- deficient medium containing 0.028% NaH2PO4· 2H2O and of the M dissociant in the basal medium supplemented with chalk powder, these dissociants were completely displaced from the media. |
| |
Keywords: | population composition dissociation medium composition growth dynamics Pseudomonas aeruginosa |
本文献已被 SpringerLink 等数据库收录! |
|