passive diffusion

Relying on the passive diffusion and dispersion to get access to the cancerous vasculature, nanoparticles could get into the body through intravenous injection, remain in the tissue space for a long time, and finally accumulate in the cancer cells.

治疗肿瘤时，纳米颗粒可以通过静脉注射进入肌体，主要依靠被动扩散和弥散作用渗入肿瘤的脉管系统，在肿瘤组织间隙停滞较长时间，最终导致药物在肿瘤细胞内积聚。

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；

RESULTS: The absorption mechanism of oxymatrine complied with the passive diffusion and first order kinetics.

结果氧化苦参碱在肠道的吸收呈现一级吸收动力学特征且吸收机制为被动转运.

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.

Passive diffusion tube for detecting nitrogen dioxide

检测二氧化氮的静态扩散管

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；