I at 



is 



at -I 

 t w 

 CO o 



b. >- 

 O o 



go: 



lit: 



10 50 100 ISO 200 



MICROCURIES OF STRONTIUM -90 PER LITER OF MEDIA 



200 



10 20 60 



MILLIGRAMS OF STRONTIUM 



no 



PER LITER OF MEDIA 



Figure 5. Uptake of radioactive strontlua 

 In relation to Its concentration In the aedlui 

 by K^. rotundata after 48 hours exposure. 

 Single determinations plotted. 



Figure 6. Uptake of strontium in relation 

 to its concentration in the medium. Medium 

 contains a concentration of 200 microcuries of 

 strontium-90 per liter. Single determinations 

 plotted . 



■5 20.1 



o 



IS. 



® 





10.- 



w 



a. 



a: 

 u 



24 



Time 



48 



In Hours 



Figure 7 The loss of Cs-Ba^^^ from G. simplex cells after introduction into 



fresh medium. 



X Observed radioactivity retained In G. simplex cells. 



Calculated loss In radioactivity due to increase in cell material 



^ Difference between observed and calculated value. 



16- 



