phages i alpha and i2-2: inci plasmid-dependent bacteriophages.phage i alpha was isolated from sewage from windhoek, south west africa. it formed relatively clear plaques about 2 mm in diameter, on sensitive strains of escherichia coli k12 and salmonella typhimurium lt2. the phage had an hexagonal outline with a diameter of about 24 nm, contained rna and was resistant to chloroform. phage i alpha formed plaques or propagated only on organisms carrying i1 plasmids or the i gamma plasmid r621a. the efficiency of plating was higher on e. coli than on s. typhim ...19826130121
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