Definition of Macronucleus

1. Noun. (biology) The larger the two nuclei present in ciliate protozoans; it controls the nonreproductive functions of the cell. ¹



¹ Source: wiktionary.com

Definition of Macronucleus

1. [n -NUCLEI]

Medical Definition of Macronucleus

1. The larger nucleus (or sometimes nuclei) in ciliate protozoans. Derived from the micronucleus by a process of DNA polytenisation. The DNA in the macronucleus is actively transcribed. The macronucleus degenerates before conjugation. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)

Macronucleus Pictures

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Lexicographical Neighbors of Macronucleus

macromonomer
macromonomeric
macromonomers
macromorphological
macromorphologies
macromorphology
macromyeloblast
macron
macron below
macronormoblast
macronormochromoblast
macrons
macrons below
macronuclear
macronuclei
macronucleus (current term)
macronutrient
macronutrients
macronychia
macroorganism
macroorganisms
macroparameters
macroparasite
macroparasites
macroparticle
macroparticles
macropathology
macropetalous

Literary usage of Macronucleus

Below you will find example usage of this term as found in modern and/or classical literature:

1. Biological Studies by the Pupils of William Thompson Sedgwick: Published in (1906)
"Four micronuclei can be seen to the right of the macronucleus, and, in addition, a relatively large unabsorbed fragment of the old macronucleus. ..."

2. Report of the Annual Meeting (1900)
"At the end of conjugation the macronucleus disintegrates, as in the Ciliata. The new macronucleus, which makes its appearance during the early stages of the ..."

3. The Journal of Physiology by Physiological Society (Great Britain). (1896)
"In all the figures, n = macronucleus. mac ... to show position of macronucleus, coexistence of microsomes and ... segmentation of macronucleus. ..."

4. Biological Bulletin by Marine Biological Laboratory (Woods Hole, Mass.) (1914)
"i macronucleus, 2 io min. 2 hrs. 25 2 macronuclei. 2 3 ii division. 14 2 30 i macronucleus, i micronucleus. 30 ii 40 2 macronuclei, 2 micronuclei. ..."

5. The Journal of Medical Research by American Association of Pathologists and Bacteriologists (1904)
"In the macronucleus is a large vesicular structure similar to the ... FIG. 85. Entire macronucleus with large residual body of the parasite. ..."

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