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Autotrophically grown infected cells are able to replicate phage SH-133 after being switched to a heterotrophic environment (step-up growth). The effect of step-down growth on phage replication varies with the choice of organic substrate. Phage replication and the induction of cellular hydrogenase occur under step-down growth from acetate but not peptone broth. The requirement of a continued source of energy for phage replication in either heterotrophically or autotrophically grown cells could be uniquely demonstrated in this phage-host system by the deletion of hydrogen from the growth medium.

journal of virology

Replication of Bacteriophage SH-133 in the Facultative Autotroph Hydrogenomonas facilis II. Bacteriophage Synthesis and Hydrogenase Induction Under Step-Up and Step-Down Growth Conditions