| 释义 |
A band Histology.|eɪ bænd|
[Named A (in place of Q) by K. Hürthle 1909, in Arch. f. die ges. Physiol. CXXVI. 23, repr. G. anisotrop anisotropic (in allusion to its optical properties).]
Each of the transverse bands which alternate with I bands in fibrils of striated muscle, appearing dark under polarized light and composed of longitudinal filaments of myosin (and actin).
[1937J. D. Bernal in Needham & Green Perspectives in Biochem. 47 The individual myofibril..consists alternately of two portions... The anisotropic portion (A), has a markedly stronger positive double refraction than the other... A certain amount of evidence points to the greater thickness of the A portions.] 1939Physiol. Rev. XIX. 287 The A (for anisotropic, also called Q in the older literature) and the I..bands, respectively. 1966C. R. & T. S. Leeson Histol. ix. 163/1 During contraction the A band remains constant in length but the H band and I band diminish. 1974D. & M. Webster Compar. Vertebr. Morphol. vi. 114 These actin filaments are not only in the I band but also extend into the A band, running between myosin filaments. |