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Abstract
Azotobacter vinelandii ATCC 12837 was cultured in iron-limited and molybdenum-limited media. Under these culture conditions a growth inhibition was observed as a consequence of mineral-limitation. Chemical analyses showed that cells grown in iron-limited medium contained more large amounts of PHB than control cells. Also, when Azotobacter grown under mineral-limited conditions showed an increase on cyst formation compared with mineral-suffIcient cultures. These observations were confirmed through photorreactivation studies.
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