Lockshon, D., and Morris, D. R. Positively Supercoiled Plasmid DNA is Produced by Treatment of Escherichia coli with DNA Gyrase Inhibitors. Nuc. Acid. Res. 11, 2999-3017 (1983).

Srivenugopal, K. S., Lockshon, D., and Morris, D. R. Escherichia coli DNA Topoisomerase III; Purification and Characterization of a New Type 1 Enzyme. Biochemistry 23, 1899-1906 (1984).

Lockshon, D., and Morris, D. R. Sites of Reaction of Escherichia coli DNA Gyrase on pBR322 In Vivo as Revealed by Oxolinic Acid-Induced Plasmid Linearization. J. Mol. Biol. 181, 63-74 (1984).

Srivenugopal, K. S., and Morris, D. R. Differential Modulation by Spermidine of Reactions Catalyzed by Type 1 Prokaryotic and Eukaryotic Topoisomerases. Biochemistry 24, 4766-4771 (1985).

Srivenugopal, K. S., and Morris, D. R. Modulation of them Relaxing Activity of Escherichia coli Topoisomerase I by Single-Stranded DNA Binding Proteins. Biochem. Biophys. Res. Commun. 137, 795-800 (1986).