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Journal of Dental Research
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Identification of PK 1 Bacteriophage DNA in Streptococcus mutans

M. Higuchi

Laboratory of Oral Biochemistry, Tohoku University School of Dentistry, Sendai 980, Japan, Laboratory of Radioisotope Research, Tohoku University School of Medicine, Sendai 980, Japan

M. Higuchi

Laboratory of Oral Biochemistry, Tohoku University School of Dentistry, Sendai 980, Japan, Laboratory of Radioisotope Research, Tohoku University School of Medicine, Sendai 980, Japan

A. Katayose

Laboratory of Oral Biochemistry, Tohoku University School of Dentistry, Sendai 980, Japan, Laboratory of Radioisotope Research, Tohoku University School of Medicine, Sendai 980, Japan

A lysogenic bacteriophage PK 1 and plasmid DNA's in Streptococcus mutans PK 1 have been characterized by electron microscopy. PK 1 phage DNA molecules were observed in both linear and circular forms, which gave the molecular weights of (28.9 ± 0.4) x 106 and (27.4 ± 0.2) x 106 daltons, respectively. Plasmid DNA has a molecular weight of 4.0 x 106 daltons. No difference of density in CsCl density gradient between linear and circular forms of phage DNA and plasmid DNA was observed.

Journal of Dental Research, Vol. 61, No. 2, 439-441 (1982)
DOI: 10.1177/00220345820610021501
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