| nu | 1. Thirteenth letter of the Greek alphabet, &nu. 2. Symbol for kinematic viscosity; frequency; stoichiometric number. 3. In chemistry, denotes the position of a substituent located on the thirteenth atom from the carboxyl or other functional group. (05 Mar 2000) |
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| nu body | <cell biology> Repeating units of organisation of chromatin fibres in chromosomes, consisting of around 200 base pairs and two molecules each of the histones H2A, H2B, H3 and H4. most of the DNA (around 140 base pairs) is believed to be wound around a core formed by the histones, the remainder joins adjacent nucleosomes, thus forming a structure reminiscent of a string of beads. Origin: Gr. Soma = body (18 Nov 1997) |
| NU-3 protein tyrosine phosphatase | <enzyme> The murine homolog of rat cam tyrosine phosphatase; has an extracellular cell-adhesion-molecule-like domain; mw 211 kD; genbank x82288 Registry number: EC 3.1.3.- Synonym: nu-3 ptp, ptp nu-3 (26 Jun 1999) |
| nubecula | 1. <astronomy> A nebula. Specifically, the Magellanic clouds. 2. <medicine> A slight spot on the cornea. A cloudy object or appearance in urine. Origin: L, dim. Of nubes cloud. Source: Websters Dictionary (01 Mar 1998) |
| Nuc | <biochemistry> Purine or pyrimidine base linked glycosidically to ribose or deoxyribose, but lacking the phosphate residues that would make it a nucleotide. Ribonucleosides are adenosine, guanosine, cytidine and uridine. Deoxyribosides are deoxyadenosine, deoxyguanosine, deoxycytidine and deoxythymidine (the latter is almost universally referred to as thymidine). (18 Nov 1997) |
| nucament | <botany> A catkin or ament; the flower cluster of the hazel, pine, willow, and the like. Origin: L. Nucamenta fir cones, fr. Nux, nucis, a nut. Source: Websters Dictionary (01 Mar 1998) |
| nucamentaceous | <botany> Like a nut either in structure or in being indehiscent; bearing one-seeded nutlike fruits. Alternative forms: nucumentaceous. See: Nucament. Source: Websters Dictionary (01 Mar 1998) |
| nucellus | <botany> See Nucleus. Origin: NL, dim. Of nux, nucis, a nut. Source: Websters Dictionary (01 Mar 1998) |
| nucha | <zoology> The back or upper part of the neck; the nape. Origin: LL. Source: Websters Dictionary (01 Mar 1998) |
| nuchal | <anatomy> Of, pertaining to, or in the region of, the back, or nape, of the neck; applied especially to the anterior median plate in the carapace of turtles. Origin: Cf. F. Nucal. Source: Websters Dictionary (01 Mar 1998) |
| nuchal fascia | <anatomy> The fascia that encloses the posterior muscles of the neck. Synonym: fascia nuchae. (05 Mar 2000) |
| nuchal ligament | A sagittal ligamentous band at the back of the neck, formed of thickened supraspinous ligaments; it extends from the external occipital protuberance to the posterior border of the foramen magnum, cranially, to the seventh cervical spinous process, caudally. Synonym: apparatus ligamentosus colli, nuchal ligament. (05 Mar 2000) |
| nuchal plane | <anatomy> The external surface of the squamous part of the occipital bone below the superior nuchal line, giving attachment to the muscles of the back of the neck. (05 Mar 2000) |
| nuchal region | The back of neck, including the suboccipital region. Synonym: regio nuchalis, nuchal region, posterior neck region, regio cervicalis posterior. (05 Mar 2000) |
| nuchal rigidity | <neurology> Resistance to flexion of the neck, seen in individuals with meningitis. (27 Sep 1997) |