macronucleus

(redirected from macronuclei)
Also found in: Medical, Encyclopedia.
Related to macronuclei: macronuclear, Meganucleus

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.

macronucleus

(ˌmækrəʊˈnjuːklɪəs)
n, pl -clei (-klɪˌaɪ)
(Microbiology) the larger of the two nuclei in ciliated protozoans. Compare micronucleus

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.
References in periodicals archive ?
A urelia il DNA sequence in Paramecium macronuclei is related to the [beta] subunit of G proteins.
sup][2],[5] In 2000 WHO classification, the pathological criteria for the diagnosis of atypical meningiomas are: ≥4 mitoses/10 HPF or at least three of the following features are present: Sheeting, macronuclei, small cell formation, hypercellularity, foci of spontaneous necrosis;[sup][1],[2],[5],[6] and in 2007, the WHO definition of atypical meningioma added brain invasion as an alternative criterion.
Most skin metastases will show a "bottom heavy" growth of the tumor that is restricted to the deep dermis Metastases of colonic origin however may show abutment of the dermis with macronuclei.