Since the molecule is easily ionized, voltage drops across the nanopore help "pull" the DNA through.
由于分子很容易被电离，通过纳米孔的电压落差有助于牵引dna穿过微孔。
The remainder molecules in the vacuum tube will be ionized by X-ray irradiation, the ionization current can be detected at a constant DC voltage.
利用X射线对气体分子的电离作用，在一定电压下用一束X射线照射真空灭弧室，使灭弧室内产生电离电流。
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