硅藻已经通过胞外分泌二氧化硅，这是细胞直接把物质分泌出细胞壁的一个生物过程。
Diatoms already secrete silica by exocytosis-a biological process by which cells direct secreted material outside the cell walls.
目的探讨细胞壁缺陷对枯草芽胞杆菌形成芽胞的能力以及芽胞物质合成代谢的影响及其机制。
Objective To probe the effecting on the sporulation and biosynthesis of spore of Bacillus subtilis by cell wall deficient.
结果：大鼠胃小凹上皮细胞、胃底腺壁细胞呈DHEA免疫反应阳性，阳性物质分布于胞质内，胞核阴性。
Results: the parietal cells in gastric epithelial cells appeared DHEA positive immune reaction. The positive substance was distributed in the cytoplasm and negative in the nuclei.
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