macronucleus|macronuclei|macronucleuses in English

noun

['mækrəʊ'nuːklɪəs /-'nju-]

largest of two nuclei occurring in ciliate protozoans (Biology)

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1. The 'Amitotic' division of the macronucleus during binary fission in P

2. Histone H1 is highly phosphorylated in transcriptionally active, Amitotic macronuclei of Tetrahymena during vegetative growth

3. ‘Fortunately, the Amitotic division and high telomerase activity in the large macronucleus allowed Paramecium to be transformed by microinjection of DNA fragments and a method for cloning genes by complementation was developed.’

4. ‘Fortunately, the Amitotic division and high telomerase activity in the large macronucleus allowed Paramecium to be transformed by microinjection of DNA fragments and a method for cloning genes by complementation was developed.’

5. Amitosis (a-+ mitosis), also called 'karyostenosis' or direct cell division or binary fission.It is cell proliferation that does not occur by mitosis, the mechanism usually identified as essential for cell division in eukaryotes.The polyploid macronucleus found in ciliates divides Amitotically

6. ‘After Conjugation, chromosomes in the transcriptionally active macronucleus develop by fragmentation, elimination, and amplification of germ line chromosomes.’ ‘Therefore, it is only following new MAC development late in Conjugation that the previously silent MIC genomes from the mated cells are brought into expression.’