Full text not available. This article's full text was not recovered in the archive. The citation and links above point to the published record. Related research Selection of Penicillin-sensitive Mutants of Escherichia coli following Ultraviolet Irradiation Journal of General Microbiology · 1952 ← Previous article in this issueSelection of Penicillin-sensitive Mutants of Escherichia coli following Ultraviolet Irradiation