In addition to value, hue and chroma, there are many subtle secondary optical properties of natural human tooth, such as translucency, opacity, iridescence, surface gloss and fluorescence.
天然牙的视觉外观除了颜色的三要素色相、明度、饱和度以外，还有许多第二光学特征：半透性、浑浊度、晕色、表面光泽度、荧光性，其中以半透性最为重要。
In 0.5%-1.5% HFIP solutions, no remarkable changes of secondary structure and fluorescence emission maximum of AK have been observed, while the ANS increased obviously.
当六氟异丙醇浓度范围为0.5％-1.5％时，蛋白质的二级结构和内源荧光发射峰位都没有发生明显的变化，而外源ANS荧光强度则显著增强。
Meanwhile, the secondary structure of membrane protein was destroyed and endogenous fluorescence decreased.
同时，膜蛋白二级结构遭到破坏，内源荧光下降。
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