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单词 a band
释义

A bandn.

Brit. /ˈeɪ band/, U.S. /ˈeɪ ˈbænd/
Origin: A borrowing from German, combined with an English element. Etymons: German A , band n.2
Etymology: < German A (shortened < anisotrop (see anisotropic adj.); K. Hürthle 1909, in Archiv f. die gesammte Physiol. 126 23; replacing earlier Q) + band n.2, so called with reference to its optical properties under a polarizing microscope.
Histology.
In fibrils of striated muscle: each of the transverse bands which alternate with I bands, appearing dark under polarized light and composed of interdigitating filaments of actin and myosin.
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the world > life > the body > structural parts > muscle > parts of muscle > [noun] > other parts
disc1840
muscle fibre1857
Krause1873
A band1939
1937 J. D. Bernal in J. Needham & D. E. 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.]
1939 Physiol. Rev. 19 287 The A (for anisotropic, also called Q in the older literature) and the I..bands, respectively.
1974 D. Webster & 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.
2008 Developmental Biol. 318 236/2 The giant molecule, titin, spans half the sarcomere from Z-band to the middle of the A-band.
This entry has been updated (OED Third Edition, December 2011; most recently modified version published online December 2021).
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n.1939
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