The PHB degradation rate in the present study was muchslower (Fig. 2) compared with marine bacteria, in whichPHB was degraded to zero (not detectable level) within a fewhours of starvation [22]. It seemed that the PHB degradationrate was a more important factor for survival ability than theinitial PHB content. The higher demand for maintenanceenergy by some of the strains resulted in a quicker disappearanceof PHB from the cells and, consequently, a lowerability to survive starvation. For instance, two strains, no. 23and no. 136, when grown in a nitrogen-free medium, retaineda considerable amount of PHB throughout the entirestarvation period (70 days, Fig. 2) and had exceptionallyhigh survival ability (Table 5). This is clearly in contrast tostrains 111a and 115 (Fig. 2 and Table 5).
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