Key points are not available for this paper at this time.
A modified transformation procedure that is effective for the introduction of plasmid deoxyribonucleic acid at high frequency into Salmonella typhimurium , as well as into Escherichia coli , is described. Transformed bacteria acquire a circular deoxyribonucleic acid species having the genetic and molecular characteristics of the transforming plasmid.
Lederberg et al. (1974) studied this question.