Takezoe H, Yu H
Biophys Chem. 1981 Nov;14(3):205-16. doi: 10.1016/0301-4622(81)85021-1.
Electro-optical characterization of the photoreceptor disk membrane vesicle is performed by examining the electric field and concentration dependence of the study-state birefringence of aqueous suspensions of the vesicles. The electric polarizability anisotropy is found to be negative and of large magnitude: alpha 1 - alpha 2 = -(1-3) X 10 cm3. The optical anisotropy is determined to be also negative but of small magnitude: g 1 - g 2 = -1 X 10(-7). The specific Kerr constant deduced from the concentration dependence of the Kerr constant is found to be very large: Ksp = 7 X 10(-4) e.s.u. Upon deforming the vesicles osmotically from the spherical shell to the disk structure, the steady-state birefringence increases by an order of magnitude which is attributed solely to the increase in optical anisotropy attending the corresponding change in the geometric eccentricity of the vesicle. A plausible birefringence mechanism based on the known structural features of the vesicles is proposed, which would account for these findings.
通过研究囊泡水悬浮液的稳态双折射对电场和浓度的依赖性，对光感受器盘膜囊泡进行电光特性表征。发现电极化率各向异性为负且数值较大：α1 - α2 = -(1 - 3)×10⁻²³ cm³。确定光学各向异性也为负但数值较小：g1 - g2 = -1×10⁻⁷。从克尔常数的浓度依赖性推导出的比克尔常数非常大：Ksp = 7×10⁻⁴ e.s.u.。当囊泡通过渗透作用从球壳形变为盘状结构时，稳态双折射增加一个数量级，这完全归因于随着囊泡几何偏心率的相应变化，光学各向异性的增加。基于囊泡已知结构特征，提出了一种合理的双折射机制，该机制可以解释这些发现。
