354 



RESPIRATORY METABOLISM 



which this energy is derived, and the mechanism by which it is obtained 

 from the substrate. In addition to these factors, there is a possibihty of 

 a direct relationship between certain metabohc processes and the patho- 

 genicity of parasitic forms. 



Methods of Measuring Aerobic Respiration 



Methods that have been or might be used for measurement of aerobic 

 protozoan respiration fall naturally into two groups — those applicable 



Table 3: Sensitivity of Respirometers 



* It is assumed that the meniscus is read to the nearest 0.2 mm., unless otherwise stated by the 

 authors. In those cases where the author claims greater reading accuracy, the smallest unit of change 

 which can be detected is given in this column. If stability is adequate, the sensitivity of several models 

 may be considerably increased by the use of special reading devices. 



to concentrated suspensions of organisms, and those applicable to a few 

 or to single cells. For concentrated suspensions, titration, gas analysis, 

 and standard manometer methods have been used; and for studies of 



