The natural dragline silk secreted by a spider at low rate had finer structure in its skin surface than fibroin, and the dragline silk secreted by a dropping spider at high rate ha...

• 这些丝纤维的断面内都分布有大量微细的原纤,形状基本为圆形,其中三种蜘蛛丝的微纤维直径相似,而丝素纤维内的微纤维要粗得多。