1887

Abstract

SUMMARY: has been observed to give rise to mutants which are indistinguishable from ferments lactose and xylose (Xyl +), elaborates a soluble haemolysin and/or a proteolytic enzyme (H), and its cell walls contain glucose units in addition to certain other components. On horse blood agar forms small colonies () surrounded by large zones of haemolysis. and the mutant derived from ferment lactose but not xylose, produce no soluble haemolysin, and glucose cannot be detected in hydrolysates of their cell walls. The change in the basal structure of the cell wall is accompanied by a lack of immunochemical cross-reaction between the wild type and the mutant or On horse blood agar both and the mutant produce relatively large colonies surrounded by narrow bands of haemolysis. The possibility that a single mutation involving cell- wall structure may account for the apparent change from XylH to XylH is discussed. It is suggested that neither nor is a corynebacterium, and that taxonomically both organisms belong to the genus

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1957-06-01
2022-01-19
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