| nuchal tubercle | The vertebra in the cervicothoracic region which has the most prominent spinous process (seventh cervical vertebra in 70% of the cases, sixth in 20%, and first thoracic vertebra in 10%). Synonym: nuchal tubercle. (05 Mar 2000) |
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| nuciform | <botany> Shaped like a nut; nut-shaped. Origin: L. Nux, nucis, nut. Source: Websters Dictionary (01 Mar 1998) |
| nucin | <chemistry> See Juglone. Origin: L. Nux, nucis, a nut. Source: Websters Dictionary (01 Mar 1998) |
| Nuck's diverticulum | A peritoneal diverticulum in the embryonic lower anterior abdominal wall that traverses the inguinal canal; in the male it forms the tunica vaginalis testis and normally loses its connection with the peritoneal cavity; a persistent processus vaginalis in the female is known as the canal of Nuck. Synonym: Nuck's diverticulum, processus vaginalis peritonei, vaginal process of peritoneum, vaginal process of testis. (05 Mar 2000) |
| Nuck's hydrocele | Accumulation of serous fluid in the labium majus or in Nuck's canal. Synonym: hydrocele muliebris, Nuck's hydrocele. (05 Mar 2000) |
| Nuck, Anton | <person> A Dutch anatomist. Lived: 1650-1692. See: Nuck's diverticulum, Nuck's hydrocele, canal of Nuck. (05 Mar 2000) |
| nucle | <botany> Same as Nutlet. Origin: L. Nucula a small nut. Source: Websters Dictionary (01 Mar 1998) |
| nuclear | <cell biology> Of or pertaining to a nucleus; as, the nuclear spindle or the nuclear fibrils of a cell; the nuclear part of a comet, etc. Source: Websters Dictionary (01 Mar 1998) |
| Nuclear actin binding protein | <molecular biology> Nuclear protein, dimer of 34 kD subunits. Binds actin with Kd of around 25M. (18 Nov 1997) |
| nuclear atom | <physics, radiobiology> A concept or model of the atom characterised by the presence of a small, massive nucleus at its centre. (05 Mar 2000) |
| nuclear bag | <cell biology> The aggregation of nuclei occurring in the nonstriated centre of an intrafusal muscle fibre of a neuromuscular spindle. (05 Mar 2000) |
| nuclear bag fibre | The largest type of intrafusal muscle fibre's in a neuromuscular spindle, containing a central aggregation of nuclei (nuclear bag). (05 Mar 2000) |
| nuclear binding energy | <physics> The difference between the total energy (= mc^2) of the bound nucleus, and the energies of the individual constituent particles (= sum of masses c^2). The nuclear binding energy per nucleon is a maximum for iron. Fusion releases energy because light nuclei are less tightly bound than medium-weight nuclei, and thus energy is liberated when they become more tightly bound after fusing. Fission releases energy for the same reason - heavy nuclei are also less tightly bound than medium-weight nuclei, and energy is liberated when heavy nuclei split into lighter nuclei. (09 Oct 1997) |
| nuclear bone scan | A nuclear medicine test that involves the introduction of a radioactive compound into the blood stream. The radioactive compound acts as a tracer and allows for the imaging of the bony skeleton. (27 Sep 1997) |
| nuclear cardiology | <radiology> Myocardial infarct imaging (Tc-99m PYP), myocardial perfusion imaging (Tl-201), blood pool (MUGA), first-pass studies (12 Dec 1998) |