title: Isolation and base composition of DNA's of primitive land plants. I. Ferns and fern-allies.
mesh_terms: D005075:Biological Evolution; D002499:Centrifugation, Density Gradient; D003597:Cytosine Nucleotides / Q000032:analysis; D004247:DNA / Q000032:analysis*; D006150:Guanine Nucleotides / Q000032:analysis; D006358:Hot Temperature; D009691:Nucleic Acid Denaturation; D009711:Nucleotides / Q000032:analysis; D010944:Plants / Q000032:analysis*; D013045:Species Specificity
chemical_list: D003597:Cytosine Nucleotides; D006150:Guanine Nucleotides; D009711:Nucleotides; D004247:DNA