| nucleoloid | Synonym: nucleoliform. Origin: nucleolus + G. Eidos, resemblance (05 Mar 2000) |
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| nucleolonema | The irregular network or rows of fine ribonucleoprotein granules or microfilaments forming most of the nucleolus. Origin: nucleolus + G. Nema, thread (05 Mar 2000) |
| nucleolus | <cell biology> A small dense body (sub organelle) within the nucleus of eukaryotic cells, visible by phase contrast and interference microscopy in live cells throughout interphase. Contains RNA and protein and is the site of synthesis of ribosomal RNA. The nucleolus surrounds a region of one or more chromosomes (the nucleolar organiser) in which are repeated copies of the DNA coding for ribosomal RNA. (18 Nov 1997) |
| nucleolus organiser | <molecular biology> Loop of DNA that has multiple copies of rRNA genes. See: nucleolus. (18 Nov 1997) |
| nucleolus organiser region | The chromosome region which is active in nucleolus formation and which functions in the synthesis of ribosomal RNA. (12 Dec 1998) |
| nucleomicrosome | One of the minute particles or granules making up the substance of the cell nucleus. Synonym: nucleomicrosome. Origin: karyo-+ G. Mikros, small, + soma, body (05 Mar 2000) |
| nucleon | <physics> Any particle found in the structure of an atomic nucleus, i.e., neutron or proton. (16 Dec 1997) |
| nucleopetal | 1. Moving in the cell body in a direction toward the nucleus. 2. Moving in a direction toward a nerve nucleus; said of a nervous impulse. Origin: nucleo-+ L. Peto, to seek (05 Mar 2000) |
| Nucleophaga | A microsporan parasite of amoebae which destroys the nucleus of its host. Origin: nucleo-+ G. Phago, to eat (05 Mar 2000) |
| nucleophil | Nucleophile 1. The electron pair donor atom in a chemical reaction in which a pair of electrons is picked up by an electrophil. 2. Relating to a nucleophil. Synonym: nucleophilic. Origin: nucleo-+ G. Philos, fond (05 Mar 2000) |
| nucleophile | <chemistry> A species that loves a nucleus. Since nuclei are positively charged, nucleophiles are negatively charged or bear a partial negative charge. Examples are lone pairs or a hydroxide ion. (09 Jan 1998) |
| nucleophilic | Synonym: nucleophil. 2. A reaction involving a nucleophile. (05 Mar 2000) |
| nucleophosphatases | <enzyme> A class of enzymes that catalyze the conversion of a nucleotide and water to a nucleoside and orthophosphate. Registry number: EC 3.1.3.- (12 Dec 1998) |
| nucleoplasm | <cell biology> By analogy with cytoplasm, that part of the nuclear contents other than the nucleolus. (18 Nov 1997) |
| nucleoplasmic | <biology> Of or pertaining to nucleoplasm; especially. Applied to a body formed in the developing ovum from the plasma of the nucleus of the germinal vesicle. Source: Websters Dictionary (01 Mar 1998) |