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G 菌的细胞膜外侧存在着一种膜称为外膜。大肠杆菌的这层外膜非常结实,水溶性的高分子物质和疏水性物质很难通过,因此
There is a membrane outside of the G cell membrane known as the outer membrane. This layer of E. coli outer membrane is very strong, water-soluble polymers and hydrophobic substances is difficult to pass, therefore