42 MICROBIOLOGY 



GRAM'S STAIN, a method of differential bleaching after gentian 

 violet, methyl violet, etc. The + mark is to be given only 

 when the bacteria are deep blue or remain blue after counter- 

 staining with Bismark brown. 



GRUMOSB, clotted. 



INFUNDIBULIFORM, form of a funnel or inverted cone. 



IRIDESCENT, like mother-of-pearl. The effect of very thin films. 



LACERATE, having the margin cut into irregular segments as if 

 torn. 



LOB ATE, border deeply undulate, producing lobes (see undulate). 



LONG, many weeks, or months. 



MAXIMUM TEMPERATURE, temperature above which growth does 

 not take place. 



MEDIUM, several weeks. 



MEMBRANOUS, growth thin, coherent, like a membrane. 



MINIMUM TEMPERATURE, temperature below which growth does 

 not take place. 



MYCELIOID, colonies having the radiately filamentous appearance 

 of mold colonies. 



NAPIFORM, liquefaction with the form of a turnip. 



NITROGEN REQUIREMENTS, the necessary nitrogenous food. This 

 is determined by adding to nitrogen-free media the nitrogen 

 compound to be tested. 



OPALESCENT, resembling the color of an opal. 



OPTIMUM TEMPERATURE, temperature at which growth is most 

 rapid. 



PELLICLE, in fluid bacterial growth either forming a continuous or 

 an interrupted sheet over the fluid. 



PEPTONIZED, said of curds dissolved by trypsin. 

 'PERSISTENT, many weeks, or months. 



PLUMOSE, a fleecy or feathery growth. 



PSEUDOZOOGLOEAE, clumps of bacteria, not dissolving readily in 

 water, arising from imperfect separation, or more or less 

 fusion of the components, but not having the degree of com- 

 pactness and gelatinization seen in zoogloeae. 



PULVINATE, in the form of a cushion, decidedly convex. 



PUNCTIFORM, very minute colonies, at the limit of natural vision. 



RAISED, growth thick, with abrupt or terraced edges. 



RAPID, developing in 24 to 48 hours. 



REPAND, wrinkled. 



RHIZOID, growth of an irregular branched or root-like character,, 

 as in B. mycoides. 



KING, same as RIM, growth at the upper margin of a liquid culture,, 

 adhering more or less closely to the glass. 



