Selenite F broth ( 0.4 % ) is used as enrichment medium which permits the rapid growth of enteric pathogens while inhibiting the growth of normal flora like " E . coli " for 6 8 hours.
2.
Despite the fact that mannitol was used by Beijerinck in his enrichment medium for " A . agilis ", the bacteria in pure culture cannot use it as a carbon source unless it is first degraded by other microbes.
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