Stimulation of proteinase biosynthesis by canavanine in streptococcus faecalis var. liquefaciens.

l-Canavanine, an analogue of arginine, was found to stimulate the synthesis of an extracellular proteinase in Streptococcus faecalis var. liquefaciens. Cells grown in a synthetic medium containing 10(-4)m arginine and 10(-4)m canavanine produced almost twice as much proteinase as cells grown in 2 x 10(-3)m arginine alone; total growth was the same in both media.

Toxicity of copper and ascorbic acid to Serratia marcescens.

Zimmerman, Leonard (Fort Detrick, Frederick, Md.). Toxicity of copper and ascorbic acid to Serratia marcescens.