title: Unusual bacteriophages in Salmonella newport.
abstract: Six phages were isolated from sewage and from a lysogenic strain. Three of them, belonging to a new morphological group, had contractile tails and elongated heads with axial ratios of 2.4:1. Two phages, possessing short tails and very long heads with axial ratios of 3.5:1, were new isolates of an extremely rare group. Phages of both groups formed polyheads of various sizes and shapes. The last phage, 61 nm in diameter, seemed to have a tail-like appendage. All phages had double-stranded DNA, were active on enterobacteria only, and differed in their host range. The first five phages seemed to be Salmonella specific.
mesh_terms: D000166:Acridines; D004279:DNA, Viral / Q000032:analysis; D008242:Lysogeny; D008854:Microscopy, Electron; D010772:Phosphotungstic Acid; D012475:Salmonella; D012483:Salmonella Phages / Q000032:analysis / Q000254:growth & development / Q000302:isolation & purification*; D012722:Sewage; D013194:Staining and Labeling; D014764:Viral Proteins; D014871:Water Microbiology
chemical_list: D000166:Acridines; D004279:DNA, Viral; D012722:Sewage; D014764:Viral Proteins; D010772:Phosphotungstic Acid