. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 282 KATSUMA DAN Table 4 and is represented graphically in Figure 5. Inverse correlation between the two properties is unmistakable. In this case, considering the crudeness of the technique, the adhesiveness values were roughly obtained by cutting out the plotted areas and weighing them instead of measuring the areas by a planimeter. The ratios of the adhesiveness values are in the order given in Table 4: , 1 :}}) ; TABLE 4 Cone, of Ce-ions in mol. O(NaCl) 1/3000 1/2000 1/1000 1/200 1/80 1/5
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 282 KATSUMA DAN Table 4 and is represented graphically in Figure 5. Inverse correlation between the two properties is unmistakable. In this case, considering the crudeness of the technique, the adhesiveness values were roughly obtained by cutting out the plotted areas and weighing them instead of measuring the areas by a planimeter. The ratios of the adhesiveness values are in the order given in Table 4: , 1 :}}) ; TABLE 4 Cone, of Ce-ions in mol. O(NaCl) 1/3000 1/2000 1/1000 1/200 1/80 1/50 1/10 1/4 Zeta potentials in * * + * + + + + Ratios of adhesiveness values * Potential values found by intrapolation. SPECIFIC EFFECT OF DIFFERENT IONS ON ADHESIVENESS If the catophoretic potential is the only factor involved in determining the adhe- siveness of the cell membrane, the eggs should have the same adhesiveness at the same potential, no matter by which ions the change is brought about. In order to test this, 1/3 M CaCL, 1/2000 M and 1/80 M CeCl3 in NaCl were selected and the adhesiveness in these solutions was tested. In all three solutions, the absolute magnitude of the potential is approximately 18 millivolts. The adhesiveness data are given in Table 5 and Figure 6. The figure shows that the above supposition is not true. Although the remainder curves in 1/3 M CaCU and 1/80 M CeCl3 follow a more or less similar course, that in 1/2000 M CeCL runs decidedly higher. Of. 100 150 CM/SEC FIGURE 6. Comparison of the membrane adhesiveness of Strongylocentrotus eggs in three different media, in each of which the absolute magnitude of the cataphoretic potential of the egg surface is about IS millivolts. O - O, 1/3 M CaCL; A - A, 1/2000 M CeCl= + NaCl and • • • •. 1/XOM CeCl, + Please note that these images are extracted from scanned page images that may have been digitally enha
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
