上游充通大学 SHANGHAI JIAO TONG UNIVERSITY States of liquid silk fibroin in B.mori.silk gland S泳 Postericr Middle Division Antericr Gland Division Division Pcsterior Middle Anterior Concentration) 12 25 26 26 30 Conformation Random-coil Random-col B-form pH 6.9 5.6 5.2 5.0 4.8 Viscosity Middle High High High Low State Gel Gel Gel Gel-sol K+(103%) 一- 30.2 29.5 33.3 Ca2+(103%) 17.7 460 507 Water Content 88 75 74 74 70 Freezing Water( 813 63.2 57.2 56.9 Non-freezing Water (% 6.9 118 16.8 17.1 -States of liquid silk fibroin in B. mori. silk gland