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Long time starvation (16 h) resulted in more efficient conversion of SDS to degradation products. Highest biodegradation rate of SDS (87 ± 1%) was observed in the case of 16 h of starvation but starvation beyond that lead to gradual decrease of biodegradation (Table 1). However, the longtime starved cells required longer time incubation for SDS degradation (30 h). The starvation conditions would probably prepare the cells to utilize the xenobiotics at a higher rate in the absence of any other carbon source. Similar starvation induced increase in xenobiotic degradation rates was also observed in case of dihexyl Sulphosuccinate (DHSS) degradation by Comamonas terrigena (Roig et al. 1998).

Table 1

Effect of starvation on the biodegradation of SDS by Pseudomonas aeruginosa MTCC 10311 on starvation medium containing SDS

Starvation time (h)Incubation period (h)
18243036
Percentage reduction in SDS 
74 ± 2 80 ± 2 79 ± 3 81 ± 3 
74 ± 2 81 ± 2 79 ± 2 80 ± 2 
69 ± 3 82 ± 2 83 ± 2 82 ± 3 
68 ± 3 79 ± 2 84 ± 2 83 ± 1 
16 65 ± 1 78 ± 2 86 ± 1 85 ± 2 
32 34 ± 2 41 ± 1 45 ± 1 44 ± 1 
Starvation time (h)Incubation period (h)
18243036
Percentage reduction in SDS 
74 ± 2 80 ± 2 79 ± 3 81 ± 3 
74 ± 2 81 ± 2 79 ± 2 80 ± 2 
69 ± 3 82 ± 2 83 ± 2 82 ± 3 
68 ± 3 79 ± 2 84 ± 2 83 ± 1 
16 65 ± 1 78 ± 2 86 ± 1 85 ± 2 
32 34 ± 2 41 ± 1 45 ± 1 44 ± 1 

Values are means ± SE of at least three replicates.

ANOVA analysis indicated significance of results.

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