American Heritage® Dictionary of the English Language, Fourth Edition
- n. The smaller of two nuclei in ciliate protozoans that contains genetic material and functions in reproduction.
Century Dictionary and Cyclopedia
- n. A small nucleus: distinguished from macronucleus.
“Each ciliate has something called a micronucleus; this contains two complete versions of its genome.”
“Small RNAs produced by an RNAi-related mechanism are involved in DNA elimination during development of the somatic macronucleus from the germline micronucleus in Tetrahymena.”
“On the other hand, when the mutagenic activity of the irradiated diet was tested by observing occurrence of micronucleus in erythrocytes, no significant increase was recognized.”
“The macronucleus is spheroidal and placed near the center of the body; a conspicuous micronucleus lies near it.”
“The contractile vacuole is central and dorsal; the macronucleus is in the anterior half of the body, with one attached micronucleus.”
“The macronucleus is spherical and has one micronucleus attached.”
“The macronucleus is central, spherical in form, and bears a single minute micronucleus.”
“A round macronucleus with one micronucleus is in the anterior half of the body.”
“The macronucleus is usually single, elliptical in form, and centrally placed; one micronucleus.”
“The macronucleus is invariably long and band-formed, with attached micronucleus.”
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