Drugs may cross a biologic barrier by passive diffusion, facilitated passive diffusion, active transport, or pinocytosis.
药物可通过被动扩散、易化被动扩散、主动转运或胞饮作用等方式穿越生物屏障。
2
Based on mechanism of human sight, the facula diffusion method is advanced to detect individual cross-sections in the image and takes out the contours of them.
在人眼视觉机理的基础上，提出光斑扩散方法，用来探测图像中各个纤维截面并得到其轮廓线。
3
For avoiding the diffusion of the gas containing bacteria in the tube of the respiration apparatus to pollute the air in ward and make the cross-infection.