GLOSSARY 14,-15 



Optimum temperature, temperature at which most growth occurs. 



Papillate, growth beset with small nipi)le-like processes. 



Parasitic, deriving its nourishment from some living animal or plant upon which it 

 lives and which acts as host; not necessarily i)athogenic. 



Pathogenic, not only parasitic (q. v.) but also causing disease to the host. 



Pellicle, bacterial growth forming either a continuous or an interruj)ted sheet over the 

 culture fluid. 



Peptonization, rendering curdled milk soluble by the action of peptonizing enzymes. 



Peritrichiate, api)licd to the arrangement of flagella, indicates that they are distributed 

 over the entire surface of an organism. 



Peritrichic, having flagella in peritrichiate arrangement. 



Per OS, thru the mouth. 



Persistent, lasting many weeks or months. 



Phase variation, separation of a species into strains, having somewhat different 

 characters. 



Photogenic, glowing in the dark, phosphorescent. 



Polar, at the end or pole of the bacterial cell. 



Precipitin, an antibody having the power of precipitating soluble proteins. 



Pulvinate, cushion-shaped. 



Punctiform, very small, but visible to naked eye; under 1 mm. in diameter. 



Raised, growth thick, with abrupt or terraced edges. 



Reduction, removing oxygen or its equivalent from a chemical compound; or addition 

 of hydrogen or its equivalent. Refers to the conversion of nitrate to nitrite, 

 ammonia, or free nitrogen; also to the decolorization of litmus. 



Rennet curd, coagulation of milk due to rennet or rennet-like enzymes, distinguished 

 from acid curd by the absence of acid. 



Rhizoid, growth of an irregular branched or root-like character, as B. mycoides. 



Ring, growth at the upper margin of a liquid culture, adhering to the glass. 



Rugose, wrinkled. 



Saccate, liquefaction in form of an elongated sac, tubular, cylindrical. 



Saprophytic, living on dead growth in the absence of organic matter, i. e., neither 

 autotropic (q. v.) nor parasitic. 



Sensitize, to render sensitive, usually to a foreign protein. 



Sepsis, a state of infection. 



Sheath, an envelope similar to a capsule (q. v.), but surrounding a filamentous or- 

 ganism. 



Spindled, larger at the middle than at the ends. Applied to sporangia, refers to the 

 forms frequently called Clostridia. 



Sporangium (pZ.-ia), cells containing endospores. 



Spreading, growth extending much beyond the line of inoculation, i. e., several milli- 

 meters or more. 



Stratiform, liquefying to the walls of the tube at the top and then proceeding down- 

 wards horizontally. 



Strict aerobe, see aerobic. 



Strict anaerobe, see anaerobic. 



Subcutaneous, under the skin. 



Subtermlnal, situated toward the ond of the cell but not at the extreme end, that is 

 between the positions denoted excentric (q. v.) and terminal. 



Synergism, cooperative action of two organisms, resulting in an end-product which 

 neither could produce alone. 



Thermophilic, growing best at high temperatures, i. e. 50°C or over. 



