a gas space enclosed by a liquid on all sides. The volume of the enclosed 

 gas space is altered by changes in the pressure exerted on the surround- 

 ing liquid or as the result of the absorption or loss of gas in the diver. 



E 

 E 



O 

 (J) 



I 



o 



00 



Index drop of 

 detergent 



egg 



filter paper soaked 



g in NaOH 



[ 



ground glass joint 

 ] (silicone grease) 



Figure 11-38. Schematic Diagram of Microrespirometer Used for the 

 Measurement of Oxygen Uptake of a Single Frog Egg. (From Brachet, J., 

 1957. "Biochemical Cytology," Academic Press, New York, N. Y., Fig. 11, 

 p. 23.) 



As a result, the diver rises or sinks in the flotation vessel in which it is 

 suspended. The pressure required to bring the diver to rest at a given 

 level is used to calculate the change in gas volume. The Cartesian diver 

 is a constant-volume manometer and works on the same principle as 

 the conventional Warburg manometer apparatus. 



262 / CHAPTER 11 



