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.

ΘΚΠ

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).

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. ΘΚΠ 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). < n.1939
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