Barrier tube

障管───Barrier tube

The test tube is obviously an unnatural situation, but it shows that prions can leap the species barrier without the aid of any other infectious agent.───显然在试管里的情况是一种非自然状态，但是这项研究表明朊蛋白能在不借助于任何其它传染媒介的情况下跨越物种障碍。

ion barrier film at the input of the microchannel plate (MCP) plays an important role in improving the lifetime of the third generation image tube.───微通道板离子阻挡膜在第三代微光像增强器中起着重要作用，本文在分析离子阻挡膜形成原理的基础上，给出了实验方案。