facilitated diffusion

With the decrease of sanchinoside R_ ( 1 ) and ginsenoside Rg_1 concentration , the absorption rate is increased , their absorption was is first-order process , besides the passive diffusion mechanism , facilitated diffusion and active transport may also take part in the transport process .

其吸收速率随着浓度的增加而逐渐减小，药物在小肠中的吸收不呈现一级动力学过程，吸收机制除了被动扩散以外，可能还有易化扩散和主动转运；

Their absorption was first-order process besides the passive diffusion mechanism , and facilitated diffusion and active transport may also take part in the transport process .

栀子苷在大鼠小肠的吸收速率随浓度的增加而减小，提示药物的吸收机制除了被动扩散外，可能有主动转运和易化扩散因素；

Drugs may cross a biologic barrier by passive diffusion , facilitated passive diffusion , active transport , or pinocytosis .

主动转运或胞饮作用等方式穿越生物屏障。