Dielectric behavior of the frog lens in the 100 Hz to 500 MHz range. Simulation with an allocated ellipsoidal-shells model.
Dielectric behavior of the frog lens in the 100 Hz to 500 MHz range. Simulation with an allocated ellipsoidal-shells model.
复制标题
青蛙透镜在 100 Hz 至 500 MHz 范围内的介电行为。
DOI：
10.1016/s0006-3495(91)82206-8
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发表时间：
1991
影响因子：
3.4
通讯作者：
A. Irimajiri
中科院分区：
文献类型：
--
作者：
M. Watanabe;T. Suzaki;A. Irimajiri
为了将透镜组织的无源电特性与其结构联系起来，我们在10（2）-5.10（8）Hz的频率范围内测量了离体蛙晶状体、透镜核和皮质纤维细胞匀浆的交流导纳。模压成盘状的整个透镜显示出特征性的“两步”介电色散，在1 kHz下具有10（5）量级的巨大介电常数增量。在所公开的两个子色散中，色散1具有2.10（δ）的介电常数增量（Δ ε），特征频率（fc）为2kHz，色散2具有400的Δ ε，fc为2 MHz。就损耗角正切而言，这些色散更清楚地定位为两个单独的峰。使用分配的椭球壳模型分析数据，该模型是通过考虑透镜组织内的纤维取向而开发的。色散1被分配到赤道皮质，其中纤维细胞平行于所施加的电场，色散2被分配到具有复杂纤维排列的核，并且还被分配到极皮质，其中纤维排列主要是垂直的。此外，模型分析表明，在蛙透镜中，核占据约30%的体积，并且细胞内部的相对介电常数和电导率对于皮层细胞分别为45和3 mS/cm，对于核细胞分别为28和0.3 mS/cm。
In an attempt to correlate the passive electrical properties of the lens tissue with its structure, we measured ac admittances for isolated frog lenses, lens nuclei, and homogenate of cortical fiber cells, over the frequency range 10(2)-5.10(8) Hz. The whole lenses molded into discoid shape show a characteristic "two-step" dielectric dispersion with a huge permittivity increment of the order of 10(5) at 1 kHz. Of the two subdispersions disclosed, dispersion 1 has a permittivity increment (delta epsilon) of 2.10(5) with a characteristic frequency (fc) of 2 kHz, and dispersion 2 has a delta epsilon of 400 with an fc of 2 MHz. In terms of loss tangent, these dispersions are more clearly located as two separate peaks. Data are analyzed using an allocated ellipsoidal-shells model which has been developed by taking into account fiber orientation inside the lens tissue. Dispersion 1 is assigned to the equatorial cortex, where fiber cells run parallel to the applied electric field, and dispersion 2 to the nucleus with a complex fiber arrangement and also to the polar cortex, in which the fiber alignment is predominantly perpendicular. In addition, the model analysis reveals that, in the frog lens, the nucleus occupies approximately 30% in volume and that relative permittivity and conductivity for the cell interior are, respectively, 45 and 3 mS/cm for the cortical cells, and 28 and 0.3 mS/cm for the nuclear cells.
影响因子：
--
作者：
K. Foster;H. Schwan
通讯作者：
K. Foster;H. Schwan
影响因子：
3.4
作者：
Rae,JL;Mathias,RT;Eisenberg,RS
通讯作者：
Eisenberg,RS