从螺旋理论看，芳香轮烯和非芳香轮烯都是内消旋体和外消旋体的混合物，故都不呈现旋光性。
In the light of the helix theory, aromatic annulenes and non-aromatic annulcncs are all the mixture of the mesomer and raceme, so they haven't opticity activeity.
根据丁胺卡那霉素为有旋光性物质的原理，采用旋光法测定了丁胺卡那霉素注射液含量，结果平均回收率为100．17％，变异系数为0．54％。
The rotatory method was used to determine the content of amikacin injection in the light of its right rotatory. The average recovery was 100.17%, and the coefficient of variation was 0.54%.
外消旋体、（R）-异构体和（S）-异构体具有相同的化学结构式，具有不同的立体结构和旋光性能。
The raceme, the (R)-isomer and the (S)-isomer are identical in chemical structural formula but different in stereostructure and optical rotation performance.
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