chromatin


chromatin
The genetic material of the nucleus, consisting of deoxyribonucleoprotein, which occurs in two forms during the phase between mitotic divisions: 1) as heterochromatin, seen as condensed, readily stainable clumps; 2) as euchromatin, dispersed lightly staining or nonstaining material. During mitotic division the c. condenses into chromosomes. [G. chroma, color]
- oxyphil c. SYN: oxychromatin.
- sex c. a small condensed mass of the inactivated X-chromosome usually located just inside the nuclear membrane of the interphase nucleus; the number of sex c. bodies per nucleus is one less than the number of X-chromosomes, hence normal males and females with Turner syndrome (XO) have none (sex c. negative), normal females and males with Klinefelter syndrome (XXY) have one, and XXX-females have two c. masses. For technical reasons only about half the cells in a preparation show typical masses. SEE ALSO: Lyon hypothesis. SYN: Barr c. body.

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chro·ma·tin 'krō-mət-ən n a complex of a nucleic acid with basic proteins (as histone) in eukaryotic cells that is usu. dispersed in the interphase nucleus and condensed into chromosomes in mitosis and meiosis
chro·ma·tin·ic .krō-mə-'tin-ik adj

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n.
the material of a cell nucleus that stains with basic dyes and consists of DNA and protein: the substance of which the chromosomes are made. See euchromatin, heterochromatin.

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chro·ma·tin (kroґmə-tin) [Gr. chrōma color] the complex of nucleic acids (DNA and RNA) and proteins (primarily histones, but also nonhistone proteins) in the eukaryotic cell nucleus, comprising the chromosomes (q.v.). See also euchromatin and heterochromatin. chromatinic adj

Medical dictionary. 2011.

Look at other dictionaries:

  • Chromatin — (DAPI Färbung, blau) in einem Mauszellkern. Links mit einem Konfokalmikroskop aufgenommen, rechts mit der verbesserten Auflösung eines 3D SIM Mikroskops. Daneben sind Kernporen (anti NPC, rot) und die Lamina unter der Kernhülle dargestellt (anti… …   Deutsch Wikipedia

  • Chromatin — Chro ma*tin, n. (Biol.) The deeply staining substance of the nucleus and chromosomes of eukaryotic cells, composed of DNA and basic proteins (such as histones), the DNA of which comprises the predominant physical basis of inheritance. It was, at… …   The Collaborative International Dictionary of English

  • chromatin — [krō′mətin΄] n. [< CHROMA + IN1] a protoplasmic substance in the nucleus of living cells that readily takes a deep stain: chromatin forms the chromosomes and contains the genes …   English World dictionary

  • Chromatin — Chro ma*tin, n. [Gr. ?, ?, color.] 1. (Biol.) Tissue which is capable of being stained by dyes. [archaic] [1913 Webster] …   The Collaborative International Dictionary of English

  • chromatin — chromatin. См. хроматин. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • Chromatīn — Chromatīn, s. Pflanzenzelle …   Meyers Großes Konversations-Lexikon

  • Chromatin — Chromatin, Nucleoproteinmaterial, aus dem sich im Teilungskern der Eukaryotenzelle durch Schraubung und Faltung die ⇒ Chromosomen bilden und das im Interphasekern den entschraubten Chromosomen entspricht. C. ist mit basischen Farbstoffen… …   Deutsch wörterbuch der biologie

  • chromatin — 1882, coined 1879 by German anatomist Walther Flemming (1843 1905), from Latinized form of Gk. khromat , the correct comb. form of khroma color (see CHROMA (Cf. chroma)) + chemical suffix IN (Cf. in) (2). Related: Chromatid …   Etymology dictionary

  • Chromatin — The major structures in DNA compaction; DNA, the nucleosome, the 10nm beads on a string fibre, the 30nm fibre and the metaphase chromosome Chromatin is the combination of DNA and proteins that make up the contents of the nucleus of a cell. The… …   Wikipedia

  • Chromatin — Chro|ma|tin 〈[ kro ] n. 11; unz.; Biochem.〉 bei basischen Färbungen sich bes. stark färbende Zellkernbestandteile [zu grch. chroma „Farbe“] * * * Chro|ma|tin [↑ Chromo (2) u. ↑ in (3)], das; s, e: ↑ Histon. * * * Chromatin   [ …   Universal-Lexikon

  • chromatin — chromatinas statusas T sritis chemija apibrėžtis DNR, histonų ir kitų baltymų kompleksas, sudarantis eukarijotinių ląstelių chromosomas. atitikmenys: angl. chromatin rus. хроматин …   Chemijos terminų aiškinamasis žodynas