title: Plasmids of Azotobacter vinelandii.
abstract: Four laboratory strains and two isolates of Azotobacter vinelandii were found to contain plasmids. Twenty-five laboratory strains which could fix nitrogen did not have free, covalently closed circular plasmid DNA. The plasmids varied in size from 9 to 52 megadaltons, and each strain yielded only one plasmid. No discernible differences in ability to fix nitrogen were found between plasmid-bearing and cured cultures.
authors.affiliation: Department of Biological Sciences, North Texas State University, Denton 76203.
authors.forename: M
authors.initials: M
authors.lastname: Maia
authors.forename: J M
authors.initials: JM
authors.lastname: Sanchez
authors.forename: G R
authors.initials: GR
authors.lastname: Vela
mesh_terms: D001395:Azotobacter / Q000235:genetics*; D004269:DNA, Bacterial / Q000032:analysis; D004270:DNA, Circular / Q000032:analysis; D005798:Genes, Bacterial; D009586:Nitrogen Fixation / Q000235:genetics*; D010957:Plasmids
chemical_list: D004269:DNA, Bacterial; D004270:DNA, Circular