被动扩散

结论：安乃近溶液鼻粘膜吸收机制为被动扩散，吸收符合一级动力学，吸收速度常数K为0.02219min－1。

CONCLUSION : The mechanism of analgin nasal absorption is passive diffusion , following first order kinetics , the absorption rate constant is 0.022 19 min - 1 .

9种黄酮类化合物在Caco-2细胞模型上的吸收均为被动扩散。

The nine flavonoids in Caco-2 cell culture model are absorbed through passive diffusion .

模型分为两部分，LNG重气扩散阶段模型和被动扩散阶段模型。

The model is divided into two parts which are LNG heavy gas diffusion and passive process .

结论不同的药物浓度、pH值对药物在大鼠全肠道的吸收无显著影响，药物的吸收呈一级动力学过程，吸收机制为被动扩散。

Conclusion The concentrations of famciclovir and the pH of drug solution had no distinct effect on the absorption kinetics . The absorption of famciclovir was a first order process with passive diffusion mechanism . Famciclovir was well absorbed at all segments of intestine in rats .

E级大气条件下，径向速率衰减较慢，进入被动扩散的过程非常缓慢；LNG气化过程不明显，重气效应未完全消失，不利于LNG云团的稀释和冲淡。

But in E grade of atmospheric condition , radial velocity of cloud cluster degenerated very slow and the vaporation of cloud cluster was not evident , which lead to LNG cloud cluster was with the heavy gas effect and was relatively difficult to enter into passive diffusion .

结论麦冬多糖MDG-1在Caco-2细胞模型中的转运机制很可能是以被动扩散为主，并且以未降解的药物形式转运，无P-gp外排泵参与。

CONCLUSION The transport of MDG-1 across Caco-2 cell is probably passive diffusion as the dominating process without the P-gp efflux , meanwhile , intact MDG-1 is proved to be absorbed through Caco-2 cell .

从而确定最佳的实验条件为流速1.8mL/min，给药体积为10mL，丹皮酚、肉桂酸、绿原酸、阿魏酸的鼻黏膜吸收均为被动扩散且吸收良好。

Finally , the optimum parameters are as follows : flow rate is 1.8mL / min , the volume is 10mL , the nasal absorption of chlorogenic acid , Ferulic Acid , Peoniflorin , Paeonol and Cinnamic acid is passive transport , and the absorption is good .

吸收机制为被动扩散。

The mechanism of AM-SD absorption may be passive diffusion .

结论法莫替丁在肠道的吸收为被动扩散。

Conclusion Famotidine is passively absorbed by transferring the intestine .

被动扩散技术在环境空气监测中的应用

Application of Passive diffusion Technology in Environment Air Monitoring

结果游离醋酸亮丙瑞林的转运符合被动扩散的性质。

Results The transport of leuprolide was passive diffusion .

应用被动扩散管采样监测室内环境空气中的SO2和NO2

Application of Passive Diffusion Tube to Monitor Indoor Air Pollutants of SO_2 and NO_2

结果9-硝基喜树碱以被动扩散为主要方式被细胞摄取和转运。

Results The uptake and absorption of 9-NC were passive diffusion as the dominating process .

结论尼扎替丁在大鼠肠道内的吸收呈现一级吸收动力学特征，其吸收机理为被动扩散。

Conclusion Nizatidine complied with the first order absorption kinetics and the absorption mechanism of Nizatidine is passive transport .

为监测机动车尾气造成的氧化型光化学烟雾的污染，采用被动扩散管的监测方法在上海布设65个监测点位。

For effectively monitoring photochemical pollution from vehicle pollutant emission , a passive diffusion tube was used in large survey .

结论芍药苷在肠道的吸收呈现一级动力学过程，且吸收机制为被动扩散；

CONCLUSION The absorption of paeoniflorin in rat ′ s intestine is a first-order process with the passive diffusion mechanism .

药物可经由脉络丛直接进入侧脑室脑脊液，再经被动扩散由脑脊液进入脑组织。

Drugs may enter ventricular CSF directly via the choroid plexus , entering brain tissue by passive diffusion from CSF .

结论葛根素微乳在肠道吸收呈一级动力学过程，吸收机制为被动扩散，葛根素微乳在结肠、回肠吸收较好。

CONCLUSION Puerarin microemulsion is well absorbed at colon , the absorption is a first-order process with the passive diffusion mechanism .

被动扩散在被动扩散过程中，跨细胞转运依赖于溶质浓度梯度。

Passive diffusion : In this process , transport across a cell membrane depends on the concentration gradient of the solute .

结论肼跨血脑屏障转运属于被动扩散的膜限速模型。

Conclusions The transport of hydrazine across blood-brain barrier accords with the model of passive diffusion in a membrane - limited rate .

应用被动扩散管监测分析葫芦岛市环境空气NO2时空分布特征

Monitoring and analysis of the spatiotemporal distribution characteristics of no_2 in the ambient air of Hu Lu Dao City by passive diffuse cell

血流量的减少（休克病人）以降低跨肠粘膜的浓度梯度，从而减少被动扩散吸收。

Decreased blood flow ( eg , in shock ) may lower the concentration gradient across the intestinal mucosa and decrease absorption by passive diffusion .

实验结果表明：盐酸氯丙嗪在各肠段的吸收均良好，药物在肠道内的吸收机制为被动扩散。

The results showed that CPZ was well absorbed in the whole intestinal segments , and the mechanism of its intestinal absorption was passive diffusion .

吸收机制为被动扩散，符合一级动力学模式，维拉帕米和吐温-80能促进芍药苷的吸收。

The absorption mechanism was passive diffusion and was accorded with First-order kinetics . Verapamil and Tween-80 showed effect on increasing the absorption of paeoniflorin remarkably .

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；

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 .

在动物界中，除了简单的被动扩散方式，主要进化产生了两类供氧方式：呼吸蛋白和气管系统。

Apart from oxygen diffusion through oxygen concentration gradient , there are other two ways for oxygen transport in animal kingdom : respiratory protein and tracheal system .

结果表明氨溴索在肠道的吸收特点为：肠道各段吸收无明显差别；吸收机制为被动扩散的方式。

The study of in situ intestinal absorption in rat showed that the absorption mechanism of Ambroxol HCl is passive diffusion without the effect of bile and other excretory products .

结论与被动扩散相比，电穿孔和离子导入可显著增加分子型药物咖啡因的经皮渗透速率和累积渗透量。

Conclusion In comparison with passive diffusion , electroporation and iontophoresis were shown to significantly increase the speed and cumulated amount of the non-ionic drug caffeine passing through the skin .

原因可能是在鱼体内，药物主要通过肾脏血管和腮被动扩散消除，而哺乳动物则主要通过肾脏的主动转运消除。

The reason may be that in fishes , drugs are eliminated mainly through the passive diffusion by renal blood vessels and gills while in mammals , through active transport by kidney .

被动扩散监测技术以其成本低、布点灵活、操作简单，易于掌握等特点在世界各地广泛应用于环境空气质量监测。

Passive diffusion monitoring technique is widely used in environment air quality monitoring because its cost is low , and it can also be arranged freely , operated simply and mastered easily .