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单词 nema
释义 nema, n.|ˈniːmə|
[a. Gr. νῆµα thread.]
1. Palæont. [H. Lapworth 1897, in J. Walther Zeitschr. d. deutsch. geol. Gesellsch. XLIX. 250.] A thread-like tubular structure attached to the sicula in some graptolites.
1901Elles & Wood Monogr. Brit. Graptolites 6 (caption) Nema.1923H. H. Swinnerton Outl. Palæont. iv. 35 The first polype of Didymograptus was enclosed in a..sicula. The apex of this is sometimes in the fossil..drawn out into a long delicate tube, the nema.1955O. M. B. Bulman Treat. Invertebr. Paleont. Graptolithina v6 Nema. Hollow threadlike prolongation of apex of prosicula by which rhabdosome was attached.1970R. M. Black Elements Palaeont. xiv. 211 The sicula..is a conical structure about 1.5 mm in length. Its apex is extended as a thread-like tube, the nema.1979D. L. Dineley Fossils iii. 78 The sicula also bears a thread (the nema).
2. Biol. = nematode n.
1917Jrnl. Agric. Res. XI. 27 Our knowledge of nemas, especially those attacking the roots of plants, is relatively very meager.1931Stekhoven & Adam (title) Freeliving marine nemas of the Belgian coast.1946Nature 26 Jan. 107/1 Many of the nema were [sic] found encysted within the host tissues as globular bodies.1970Bitki Koruma Bülteni (Ankara) X. 71 Besides studies of determining the species of plant parasitic nemas in the region, also tests were carried out to find out chemical control measures.
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