Bacteriophages were induced from cultures of Desulfovibrio vulgaris NCIMB 8303 and Desulfovibrio desulfuricans ATCC 13541 by UV light. The optimum time of UV exposure was 1 min and the maximum yield of phage was obtained 9-10 h after UV treatment. The two phage preparations were compared by restriction enzyme analysis and Southern blot hybridization. The nucleic acid from both phages was cut by restriction endonucleases specific for double-stranded DNA. The phage DNAs from D.vulgaris and D.desulfuricans showed different restriction enzyme cleavage patterns. No homology was observed between a 25 kb probe from the D.vulgaris phage DNA and the phage DNA from D.desulfuricans. Protein profiles of the phages from both sources were also studied; the D.vulgaris phage contained two major bands corresponding to M(r) values of 37000 and 56000 while the D. desulfuricans phage contained only one major band, of M(r) 38000.
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