... white surface ex- pansion, with round ball- like colonies in eleeper parts. Liquefy very slowly. Thread - like growth in depth, which slowly liquefies, forming yellow Thin grey expansion. When liquefaction sets in ...

... about 10 percent carbon dioxide). f. Examination of colonies: (1) The oxidase reaction (if available). Flow over ... dimethyl-ani- line monohydrochloride. Within a few minutes, colonies of gonococci become pink, changing to maroon and ...