肌丝晶格：对分离纤维的研究。II. 渗透强度、离子浓度和pH对单位晶胞体积的影响。
The myofilament lattice: studies on isolated fibers. II. The effects of osmotic strength, ionic concentration, and pH upon the unit-cell volume.
作者信息
April E W, Brandt P W, Elliott G F
出版信息
J Cell Biol. 1972 Apr;53(1):53-65. doi: 10.1083/jcb.53.1.53.
Abstract
The effects of osmotic concentration, ionic strength, and pH on the myofilament lattice spacing of intact and skinned single fibers from the walking leg of crayfish (Orconectes) were determined by electron microscopy and low-angle X-ray diffraction. Sarcomere lengths were determined by light diffraction. It is demonstrated that the interfilament spacing in the intact fiber is a function of the volume of the fiber. It is also shown that the interfilament spacing of the skinned (but not of the intact) fiber is affected in a predictable manner by ionic strength and pH insofar as these parameters affect the electrostatic repulsive forces between the filaments. From these combined observations it is demonstrated that the unit-cell volume of the in vivo myofilament lattice behaves in a manner similar to that described for liquid-crystalline solutions.
摘要
通过电子显微镜和低角度X射线衍射，测定了渗透压浓度、离子强度和pH值对小龙虾（螯虾属）步行腿完整和去皮单纤维肌丝晶格间距的影响。肌节长度通过光衍射测定。结果表明，完整纤维中的丝间间距是纤维体积的函数。还表明，去皮（而非完整）纤维的丝间间距受到离子强度和pH值的可预测影响，因为这些参数会影响丝之间的静电排斥力。综合这些观察结果表明，体内肌丝晶格的晶胞体积的行为方式与液晶溶液的描述相似。
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