F-肌动蛋白溶液的连续各向同性液晶转变
A continuous isotropic-nematic liquid crystalline transition of F-actin solutions
摘要：
通过光学双折射和蛋白质浓度的局部测量，研究了平均长度大于$3~μ$ m的F-肌动蛋白（F-actin）从各向同性（I）到非对称（N）液晶悬浮液的相变。这两个参数在过渡区都是连续的，表明I-N跃迁高于一阶。这一发现与Lammert，Rokhsar和Toner（PRL，1993，70：1650）的最新理论一致，该理论预测I-N转变可能由于向错的抑制而变得连续。事实上，在F-肌动蛋白的对齐相中很少发生线缺陷。个别丝在几毫克/毫升的F-肌动蛋白的解决方案进行快速平移扩散沿丝轴，而横向和旋转扩散被抑制。
英文摘要：
The phase transition from the isotropic (I) to nematic (N) liquid crystalline suspension of F-actin of average length $3~μ$m or above was studied by local measurements of optical birefringence and protein concentration. Both parameters were detected to be continuous in the transition region, suggesting that the I-N transition is higher than 1st order. This finding is consistent with a recent theory by Lammert, Rokhsar & Toner (PRL, 1993, 70:1650), predicting that the I-N transition may become continuous due to suppression of disclinations. Indeed, few line defects occur in the aligned phase of F-actin. Individual filaments in solutions of a few mg/ml F-actin undergo fast translational diffusion along the filament axis, whereas both lateral and rotational diffusions are suppressed.
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