The R-groups give the amino acids their physical-chemical characteristics such as polarity (hydrophobic or hydrophilic) and charge (acidic or positive versus basic or negative).
R基团赋予氨基酸物理化学特性，例如极性（亲水性和疏水性）以及电荷（酸性或正电荷，碱性或负电荷）。
Its polarity and electrical conductivity make it an ideal solvent for conducting the chemical reactions that are the basis of metabolism.
水的极性和导电性，使它成为新陈代谢的基本化学反应的理想溶剂。
Its improvement range depends on the polarity and chemical structure of the coupling agents.
其提高的幅度大小与偶联剂的极性及化学结构有关。
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