cel! membranes(生物膜) Allow for controlled intracellular environment Overton in 1890 demonstrated that penetration of many solutes across the membrane was a function of their lipid solubility. He proposed therefore that the membrane itself was lipid(脂质)Cell membranes(生物膜) • Allow for controlled intracellular environment • Overton in 1890 demonstrated that penetration of many solutes across the membrane was a function of their lipid solubility. He proposed therefore, that the membrane itself was lipid（脂质）