Hyperpolarization and repolarization both describe increased electronegativity within the cell.
2
但是，大多数此类化合物是呈负电性的，不能有效跨越细胞膜。
However, many classes of oligonucleotides are polyanions, so they cannot cross over cell membrane.
3
正电性荷电材料表面带有较强的正电荷，对负电性的细菌、病毒和细菌内毒素有较强的亲和作用。
Positivly charged material carries stronger positive charge on its surface and has a stronger affinity for bacterium, virus and bacterial endotoxin which cany negative charge.
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