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Journal of Dental Research
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Plasmid Content of Some Oral Microorganisms Isolated from Subgingival Plaque

P.A. Vandenbergh

Department of Microbiology, Medical School, The University of Michigan, Ann Arbor, Michigan 48109

S.A. Syed

Department of Microbiology, Medical School, The University of Michigan, Ann Arbor, Michigan 48109

C.F. Gonzalez

Department of Microbiology, Medical School, The University of Michigan, Ann Arbor, Michigan 48109

W.J. Loesche

Department of Microbiology, Medical School, The University of Michigan, Ann Arbor, Michigan 48109

R.H. Olsen

Department of Oral Biology, Dental Research Institute, School of Dentistry, The University of Michigan, Ann Arbor, Michigan 48109

Eighty-five strains of bacterial species selected from the predominant cultivable dental plaque flora of patients with different periodontal pathologies were examined for their plasmid content. Microorganisms studied included: Actinomyces viscosus, A. odontolyticus, Bacteroides asaccharolyticus (B. gingivalis), B. melaninogenicus subspecies intermedius, and subspecies melaninogenicus, Capnocytophaga ochracea (B. ochraceus), and Fusobacterium nucleatum. Three B. melaninogenicus isolates showed plasmids of approximately 2.7-2.9 Mdalton (mega-dalton) molecular size. Restriction, enzyme digests of the plasmids demonstrated dissimilar patterns when electrophoresed on agarose gels. In other microorganisms, including the Actinomyces species, plasmids were not observed.

Journal of Dental Research, Vol. 61, No. 3, 497-501 (1982)
DOI: 10.1177/00220345820610031201
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