Scientia Sinica

No. 1 TSAO, TAN, & PENG: TROPOMYOSINS FROM DIFFERENT SOURCES 101

intercept (P/C)c2o The results of such calculations are given in Table 2.

Table 2. Shape of Tropomyosins from Osmotic Data,

(P/C) c=o a/b Note

Tropomyosin Rabbit striated muscle 0.544 2.64 ' 29 (30) pH 6.5 . I=1.1 Duck gizzard smooth muscle 0.392 1.11 - 50 Prawn striated muscle 0.337 DAZ 22 Pig cardiac muscle : 0.493 1.92 36 Sepia. mantle smooth muscle 0,983 2.50 55

i

3. Viscosity and molecular asymmetry of tropomyosin

The relative viscosity of tropomyosin was determined in the same depolymerizing solutions as those used in osmotic pressure measurements. The results are given in Figs. 9-12.

Cc

Fig. 9. Viscosity of duck gizzard tropomyosin. 205°C, ——® ® pH 2.1, solvent same as in Fig. 3. —— e—— e —pH 7.0, solvent same as in Fig. 4.