Higuchi M, Higuchi M, Katayose A
J Dent Res. 1982 Feb;61(2):439-41. doi: 10.1177/00220345820610021501.
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 10(6) and (27.4 +/- 0.2) X 10(6) daltons, respectively. Plasmid DNA has a molecular weight of 4.0 X 10(6) daltons. No difference of density in CsCl density gradient between linear and circular forms of phage DNA and plasmid DNA was observed.
通过电子显微镜对变形链球菌PK 1中的溶原性噬菌体PK 1和质粒DNA进行了表征。观察到PK 1噬菌体DNA分子呈线性和环状两种形式，其分子量分别为(28.9±0.4)×10⁶和(27.4±0.2)×10⁶道尔顿。质粒DNA的分子量为4.0×10⁶道尔顿。未观察到噬菌体DNA和质粒DNA的线性和环状形式在CsCl密度梯度中的密度差异。
