Vol. 22, No. 1

JOURNAL OF VIROLOGY, Apr. 1977, p. 194-202 Copyright ©D 1977 American Society for Microbiology

Printed in U.S.A.

Bacteriophage Conversion of Spore-Negative Mutants to Spore-Positive in Bacillus pumilus MICHAEL G. BRAMUCCI, KATHLEEN M. KEGGINS, AND PAUL S. LOVETT* Department of Biological Sciences, University of Maryland Baltimore County, Catonsville, Maryland 21228

Received for publication 1 November 1976

A pseudolysogenic phage, PMB1, was isolated from soil on the basis of its ability to increase the sporulation frequency of the oligosporogenic Bacillus pumilus strain NRS 576 (sporulation frequency,