macronucleus

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Related to macronucleus: oral groove

mac·ro·nu·cle·us

(măk′rō-no͞o′klē-əs, -nyo͞o′-)

n. pl. mac·ro·nu·cle·i (-klē-ī′)

The larger of two nuclei present in ciliate protozoans, which controls nonreproductive functions of the cell, such as metabolism.

mac′ro·nu′cle·ar adj.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

macronucleus

(ˌmækrəʊˈnjuːklɪəs)

n, pl -clei (-klɪˌaɪ)

(Microbiology) the larger of the two nuclei in ciliated protozoans. Compare micronucleus

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

mac•ro•nu•cle•us

(ˌmæk roʊˈnu kli əs, -ˈnyu-)

n.

the larger of the two types of nuclei in ciliate protozoans, functioning in cell metabolism. Compare micronucleus.

[1890–95]

mac`ro•nu′cle•ar, adj.

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References in periodicals archive ?

The main features used in the identification of ciliates were: body shape, position and number of contractile vacuoles, oral and somatic ciliatures, position of macronucleus and shape of inclusions and color and the cytoplasm.

Ciliated microeukaryotes (Alveolata: Ciliophora) of a lotic urban system located in Minas Gerais--Brazil

A certain amount of DNA sequences found in the somatic macronucleus has to be eliminated during sexual reproduction, and PIWI proteins are known to play a major role in DNA elimination.

The Challenges and Opportunities in the Clinical Application of Noncoding RNAs: The Road Map for miRNAs and piRNAs in Cancer Diagnostics and Prognostics

All species of ciliates harbor two different kinds of nuclei; micronucleus that is required for sexual reproduction and other one is transcriptionally active macronucleus (Baroin-Tourancheau et al., 1992; Forney and Rodkey, 1992; Budin and Philippe, 1998; Katz, 2001; Rautian and Potekhin, 2002; Garnier et al., 2004; Shin, 2005; Zufall et al., 2006; Nekrasova et al., 2010).

Phylogenetic Relationship of Locally Isolated Paramecium Species Inferred from Histone H4 Genes

They had numerous, long cilia, macronucleus, and vacuoles, measured 70.54 [+ or -] 11.14 pm, and there was no apparent damage or host response.

Histopathological assessment of broodstock of the razor clam Ensis macha (Pharidae) from the Tongoy Bay, Chile

Unidentified ciliates were recorded in gills, characterized by a big macronucleus and several micronuclei, with dense ciliature (Fig.

Estudio histopatologico del chorito Mytilus chilensis (mytilidae) y del culengue Gari solida (psammobiidae) en el sur de Chile

The macronucleus is spherical or occasionally elipsoidal, lies on the dorsal side and is located near the middle of the cell.

New Rumen Ciliate, Entodinium kastamonicum, New Species (Ophryoscolecidae: Entodiniomorphida) from Turkish Domestic Cattle, Bos taurus Taurus

The micronucleus functions in mitosis and meiosis, whereas the macronucleus maintains routine cell function.

Chapter 6 Parasitic zoonoses

It has macronucleus at the posterior part of the body.

Ectoparasites and endoparasites among Oreochormis Niloticus (tilapia)

It gives rise to a workaday version of itself, a macronucleus, with just the animal's 27,000 or so genes and not the 95 percent of DNA that scientists typically call junk because it doesn't encode any proteins.

They're sequencing a what? Genome scientists go out on a limb of the tree of life

Ciliocytophthoria usually demonstrate cilia predominantly along one edge, but if viewed on end they may appear to be circumferentially ciliated.[1] Balantidium coli are uniformly covered with cilia.[21,22] Although dyssynchronous cilial motility was seen in this case, ciliocyiophthoria have also been noted to produce rhythmic motility.[23] Finally, ciliocytophthoria are anucleate (Figures 1 through 3), whereas B coli have a macronucleus that is typically indented or kidney shaped (Figure 4).[21,22] A careful inspection for these features should allow for accurate morphologic differentiation between ciliocytophthoria and B coli.

Ciliocytophthoria in Clinical Virology

Ciliates possess two or more dimorphic nuclei: an active somatic macronucleus and a transcriptionally inert germline micronucleus.