 infect dna isol bacillu subtili bacteriophag sp82 sp82 newli isol bacteriophag bacillu subtili describ sp82 close sp8 differ sp8 densiti denatur dna plate effcienc subtili strain sb-1 dna isol phage recov molecular weight equival amount contain singl phage 130 10 dalton dna molecular weight half piec infect compet subtili respons plaqu-form abil dna concentr suggest molecul requir initi infect center recombin studi mix dna's non-allel temperatur-sensit mutant confirm exist obligatori co-oper infect process second infect procedur util extract phage dna describ system low concentr wild-type dna expos cell concentr multipl-event natur phage dna infect preclud format unaid plaqu subsequ superinfect dna-infect cell temperatur-sensit mutant plate select condit genet rescu infect dna accomplish detect infect center elicit marker rescu phenomenon directli proport dna concentr time attain dnase resist phage dna infect center irrevers adsorb dna measur phage dna infect center requir 13 minut total dnase resist reason failur singl phage dna molecul carri infect discuss term specif breakag-reunion 