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
A plastic membrane serves as selective diffusionbarrier.
一层塑料薄膜起着选择性渗透屏障的作用。
3
Some treatment parameters led to boron carbon coating above the boride layer which ACTS as a diffusionbarrier and prevents a further growth of the boride layer.