ESSENTIAL NONMETALLIC ELEMENTS 



91 



glucose utilization by Melanospora destruens and Phycomyces nitens. 

 The papers of Siu and Mandels (1950) and Mandels and Siu (1950) 

 should be consulted for details concerning a simple differential manometer. 

 This manometer is designed to measure the respiration of intact growing 

 cultures of filamentous fungi. Dorrell (1948) investigated the effect of 



Fig. 16. A constant-temperature bath and shaking device for micro respiration 

 studies. (Courtesy of American Instrument Company.) 



dinitrophenol on endogenous and exogenous respiration of Fusarium 

 graminearum (Gibberella zeae). As usually carried out, respiration experi- 

 ments last only a few hours. The initial state of the cells or mycelium 



Table 16. The Effect of Age of Zygosaccharomyces acidifaciens Cells on the 



Amount of Aerobic Respiration 

 (Nickerson and Carroll, Jour. Cellular Cornp. Physiol. 22, 1943. Published by 

 permission of the Wistar Institute of Anatomy and Biology.) 



* Q02 equals lil O2 per hr. per mg. dry cells. 



