周质空间（Periplasmicspace）又称周质或壁膜空间。在细菌中，一般指其外膜与细胞壁之间的狭窄空间（宽约12-15nm），呈胶状。
而且从周质空间分离的蛋白经过镍住得到了进一步的纯化。
Furthermore, the protein isolated in the periplasm can be purified by nickel ion affinity chromatography.
研究发现，重组的碱性蛋白酶在进入大肠杆菌周质空间时可能存在前肽自动脱落的现象。
The study also discovered that while the recombinant alkaline protease was secreted into the periplasmic space of e.
由于大量反应是由反应中心位于外周胞质空间的膜结合脱氢酶催化的，所以反应底物不需要转运入细胞内。
As most reactions are catalyzed by the membrane-bound dehydrogenases whose reaction centers locate in the peripheral cytoplasm space, transfer of the substrates into the cell is unnecessary.
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