120 



INFLUENCE OF TEMPERATURE ON BIOLOGICAL SYSTEMS 



of furrowing in the ATP-treated eggs, it was necessary to reduce the 

 temperature by 2°, to 7° in Arbacia and to 15° in Chaetoptems. 



6.5 



_. &0 



o 



u) 5.5 





5.0 



%4S 



1"° 



h 



a. 

 3.0 



ATP 

 I .0005 M 



^ ' control; 



ARBACIA 

 PUNCTULATA 



_L. 



10 15 20 



TEMPERATURE • C. 



25 



Fig. 7. ATP-induced increase 

 in the strength of the furrowing 

 reaction. Each point indicates 

 the pressure level which is ju.st 

 sufficient to block the furrows at 

 each given temperature. Data 

 from Landau et al., 1955. 



4 



z 

 6 3.0 



3 

 8 



2 2S 



cr 



</> 

 </) 



E ' 



a. 



I .0005 M 



• CONTROL; 

 i NO ATP 



CHAETOPTERUS 

 PERGAMENTACEUS 



ZO 



30 



TEMPERATURE 



Fig. 8. Another example of 

 the ATP-induced strengthening 

 of the furrowing reaction. Points 

 are same as in fig. 7. Data from 

 Landau et ai, 1955. 



ATP Effects on Gel Structure. The data presented in figures 9 and 10 

 provide further sui^port for tlie view that the improved furrowing per- 

 formance of the ATP-treated eggs resuKs from a fortification of the 

 structure of the plasmagel layer. However, further experiments should 



