Deoxyribonucleic Acid-Ribonucleic Acid Hybridization Studies on the l -Arabinose Operon of Escherichia coli B/r

Abstract
An increase in the rate of synthesis of ara-specific messenger ribonucleic acid as measured by deoxyribonucleic acid-ribonucleic acid hybridization has been detected in the induced wild-type (ara+) strain of Escherichia coli B/r as compared with the uninduced control, thus providing evidence that regulation of the positively controlled l-arabinose operon is at the level of transcription.