当光从暗色皮毛反射时，保持偏振性。 但是从白色毛皮反射后偏振性就变弱，也就意味这对马蝇的吸引力降低。
同时这种折射计具有偏振依赖性，随着光栅倾斜角的增大偏振依赖性提高。
This refractometer is polarization dependent, and the polarization dependency raise with the increase of grating tilted angle.
在淀粉样蛋白的组织检查中最可靠的技术是刚果红或天狼星红染色切片在偏振光检查下出现特征性双折射。
In the examination of tissue for amyloid the most reliable technique is detection of the characteristic birefringence in polarised light exhibited by sections stained with Congo red or Sirius red.
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