Production of double zones of hemolysis by certain strains of hemolytic streptococci of groups A, B, C, and G on heart infusion agar.

This report describes the appearance of a double zone of hemolysis around surface colonies of certain strains of streptococci of groups A, B, C, and G incubated aerobically on sheep blood-Heart Infusion Agar. The occurrence of the altered hemolytic pattern was related to peroxide production by the organism. Anaerobic conditions and the incorporation of catalase into the agar abolished the double-zone pattern and caused reversion of the organisms to a beta-hemolytic pattern.

The optical sciences center: its history, organization, and relation to government and industry.

This paper describes the growth and formation of the Optical Sciences Center at the University of Arizona and the role of the Center in relation to mission-oriented government agencies and the optical industry. The research and academic programs are outlined, and their close relationship to the needs of government and industry is emphasized. The Optical Sciences Center building and facilities are described briefly.