INHIBITION OF RESPIRATION 65 



It may be indicated, in addition, that no species was able to use 

 mannitol, if-arabinose, /-arabinose, glucose, levulose, galactose, lac- 

 tose, soluble starch, cellobiose, glycine, or tyrosine. 



Fig. 3. A Fenn microrespirometer, having identical glass vessels of 15-ml 

 capacity. A closed system is formed when the stopcocks are shut off. There 

 are KOH wells for the absorption of C0 2 in each vessel. The fungus to be 

 tested is placed in a buffered nutrient in one vessel and buffered solution 

 alone in the other. The rate of movement of a. droplet of kerosene in 

 capillary toward the vessel with the fungus indicates the rate of O2 



consumption. 



INHIBITION OF RESPIRATION 



Much information has been acquired concerning the influence 

 of cyanides and carbon monoxide on the respiration of animal 

 cells and bacteria. Little consideration, however, has been ac- 

 corded the influence of these inhibitors on the respiration of fungi. 

 Such studies, for some reason, seem to have been made quite in- 

 cidentally. In a report by Tamiya (1942) the observation was 

 made that the respiratory rate of Aspergillus oryzae is decreased 

 26% in an atmosphere consisting of 95% CO and 5% 2 . He 

 also noted that in liquid media submerged hyphae of this fungus 

 are much more sensitive to cyanide than are aerial hyphae, as is 

 shown in Table 7. 



