332 GLOSSARY 



Chemotherafy. The use for the treatment of infectious diseases of 

 chemical agents that are effective against the parasites and are toler- 

 ated by the host. 



Fungicidal. Causing the death of fungi. 



Fungistatic. Inhibiting the growth of fungi. 



Inactivatovy nontoxic. A substance that inactivates plant viruses and is 

 not detrimental to most forms of life. 



Inhibitor or inhibitive substance. A term variously applied, but usually 

 used to designate a substance that inhibits the growth of bacteria and 

 other microorganisms. 



Lysogenesis. The production by an organism of substances that cause 

 the lysis of bacterial cells. 



Lysozyfne. A substance produced by living tissues (white of egg, tears, 

 and also certain microorganisms) that is capable of dissolving living 

 bacterial cells, especially certain micrococci. 



Mycocidal. A substance having tuberculocidal properties. 



Mycoin. A term suggested to designate antibiotics of fungal and acti- 

 nomycete origin. 



Oxford unit {O.U.). A standard for penicillin adopted by international 

 agreement and often designated as international unit (I.N.). One 

 mg. of crystalline penicillin is equivalent to 1.650 O.U. One unit in- 

 hibits the growth of a standard strain of S. aureus in 50 ml. of meat 

 broth. 



Phytoncide. A chemical substance produced by higher green plants 

 which has the capacity to inhibit the growth of bacteria and other 

 microorganisms. 



Streptomycin unit (S.U.). A dilution unit against E. coli as test organ- 

 ism, or the amount of material that will inhibit the growth of E. coli 

 in I ml. of medium J equivalent to i pg of streptomycin base. 



Tryfanotoxin. A substance that has a destructive effect upon trypano- 

 somes. 



Tuberculocidin. An antibiotic substance having tuberculocidal prop- 

 erties. 



Tuberculostatic. A substance having a bacteriostatic effect upon mem- 

 bers of the M. tuberculosis group. 



