| 释义 |
nebenkern Cytology.|ˈneːbənkɛrn|
Pl. -kerne.
[a. G. nebenkern (O. Bütschli 1871, in Zeitschr. f. wissensch. Zool. XXI. 527), f. neben near + kern kernel, nucleus.]
Any of various cytoplasmic structures associated with or resembling the nucleus (see quots.).
1898Jrnl. R. Microsc. Soc. 624 (heading) ‘Nebenkern’ in spermatogenesis of Pulmonata. 1901G. N. Calkins Protozoa i. 14 He [sc. Bütschli] held..that in addition to the macronucleus there is a second and a smaller nucleus in Infusoria, and to this he gave the name Nebenkern or micronucleus ('76). 1917Q. Jrnl. Microsc. Sci. LXII. 416, I have been unable to find any body in the spermatid formed from ‘spindle fibres’ or ‘yolk granules’, and I do not intend to use the term ‘nebenkern’, which has been, and still is, used without discrimination for almost any granule or body in a cell. For example, Hegner..lately draws attention to the ‘granules of Blochmann’ in the wasp and two ants, which have also been called ‘nebenkerne’, quite regardless of whether or no they are of the same nature as the original ‘nebenkern’ of Bütschli. 1928E. L. Opie in E. V. Cowdry Special Cytol. I. ix. 246 The name ‘nebenkern’ or ‘paranucleus’ has been given to structures situated within the cytoplasm [of the pancreatic acinous cell] and staining like nuclear material... Other chromatin-like bodies designated ‘nebenkerne’ are spherical and have an even contour. 1958Internat. Rev. Cytol. VII. 223 In other invertebrates..the mitochondrial nebenkern is transformed into a spiral wrapping that extends for the greater part of the length of the sperm tail. 1962D. W. Bishop Spermatozoan Motility 157 In insects, gastropods, and other invertebrates the conspicuous nebenkern formed during spermiogenesis arises by fusion of mitochondria. 1965E. N. Willmer Cells & Tissues in Culture II. xi. 531 The round or oval nucleus of the hair-cell [in the organ of Corti] occupies the third quarter of the cell. The infranuclear part contains a small number of mitochondria and a group of granular cisternae. Occasionally, the granular cisternae might be arranged in a circular fashion forming a ‘Nebenkern’ which recalls the so-called Retzius Body. |