CHAPTER XIII 



Glossary of Terms Used on the Charts 

 and in the Manual 



Acid curd, precipitated milk protein resulting from coagulation of milk 



due to acid production. 

 Adjuvant, a subsidiary ingredient in a bacterial inoculum which modifies 



the host response. 

 Aerobic, growing in the presence of free oxygen; strictly aerobic, growing 



only in the presence of free oxygen. 

 Agar stroke, agar slant. 

 Agglutinin, sua. antibody that causes particulate antigens to clump and 



settle out of suspension. 

 Anaerobic, growing in the absence of free oxygen; strictly anaerobic, 



growing only in the absence of free oxygen; facultatively anaerobic, 



growing in either the presence or absence of oxygen. 

 Antibody, a modified serum globuhn which reacts specifically with an 



antigen. 

 Antigen, a substance which when injected into the animal body stimulates 



the synthesis of antibody globuUn, which can then react with the 



substance injected. 

 Antiserum, serum-containing antibody. 



Antitoxin, an antibody which can neutralize a toxin or cause it to floc- 

 culate. 

 Arborescent, branched, treelike growth. 



Ataxic, lacking coordination of voluntary muscular movement. 

 Autotrophic, able to grow in absence of organic carbon and nitrogen, 



i.e., uses inorganic salts and carbon dioxide. 

 Bacteremia, the presence of bacteria in the blood stream. 

 Beaded (in stab or stroke culture), separate or semiconfluent colonies 



along the line of inoculation. 

 Brittle, growth fragile, easily broken with the inoculating needle. 

 Butyrous, growth of butterlike consistency. 

 Capsule, an envelope surrounding the cells of some kinds of bacteria. 



(Also see Sheath.) 



299 



