174
Ι50Γ
R. LALLIER
•5 100
ο
>
σ
<υ
er
50
CO
Li treatment
10
20
Hours
ο Normal
• Lithium
30
40
FIG. 11. Relative activity of acid Phosphomonoesterase in different normal and Litreated developmental stages of Psammechinus miliaris (from Gustafson and Hasselberg,
1951).
The enzymes of the second group have a low activity, relatively
constant during the cleavage but increasing in the advanced blastula or
during gastrulation. Lithium ions inhibit the rise in activity of these
enzymes. This second group includes Cholinesterase (Augustinsson and
Gustafson, 1949), malic and succinic dehydrogenases, glutaminase I
(Fig. 12), cathepsin II and apyrase (Gustafson and Hasselberg, 1951).
τ
j »-h Li treatment
|
0
10
20
30
40
Hours
FIG. 12. Relative glutaminase activity in different normal and Li-treated development
stages of Psammechinus miliaris (from Gustafson and Hasselberg, 1951).