Plasmids, drug resistance, and gene transfer in the genus Streptococcus.

INTRODUCTION .......................................................... 409 PURIFUICATION OF PLASMID DEOXYRIBONUCLEIC ACID FROM STREPTCOCCI ......................................................... 412 CONJUGATION AND PLASMID TRANSFER ......... ........................ 413 SEX PHEROMONES IN STREPTOCOCCUS FAECALIS ....... ................ 415 RESISTANCE TRANSFER IN THE ABSENCE OF PLASMID DEOXYRIBONUCLEIC ACID: EVIDENCE FOR CONJUGATIVE TRANSPOSONS? .... 418 TRANSDUCTION ........................................................... 420 TRANSFORMATION ......................................................... 420 DRUG RESISTANCE AND TRIANSPOSONS ......... ......................... 421 Ampliflable Tetracycline Resistance Determinant on pAMal ..... ........... 422 Resistance Transposons .................................................... 422 PLASMD MAINTENANCE AND INCOMPATIBILITY ....... ................. 424 MOLECULAR CLONING ...................................................... 425 CONCLUSIONS ........................................................... 426 LITERATURE CITED ......................................................... 427