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Amitosis

Definition of the noun amitosis

What does amitosis mean as a name of something?

noun - plural: amitoses

  1. the direct method of cell division characterized by simple division of the nucleus without formation of chromosomes

Explanation

  1. Amitosis is an obsolete term describing EUKARYOTIC cell division without nuclear envelope breakdown and formation of well-visible mitotic spindle and condensed chromosomes. The division of unicellular eukaryotes formerly regarded as amitosis is called today closed mitosis. An exception is the division of ciliate macronucleus, which is not mitotic, and the reference to this process as amitosis may be the only legitimate use of the term today. In animals and plants which normally have open mitosis, the microscopic picture described in the 19th century as amitosis most likely corresponded to apoptosis, a process of programmed cell death associated with fragmentation of the nucleus and cytoplasm. Actually, even in the late 19th century cytologists mentioned that in larger life forms, amitosis is a "forerunner of degeneration".
    • also known as 無絲分裂
  2. amitosis is a gene group, gene ontology group.

Printed dictionaries and other books with definitions for Amitosis

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Google previewThe Biochemistry of Development (2014)

International Series of Monographs on Pure and Applied Biology by Jean Brachet

Amitosis is the fragmentation of a resting nucleus; it is usually thought to ...

Google previewHandbook on Plant and Cell Tissue Culture (2005)

by NIIR Board of Consultants and Engineers

Amitosis is a simple division of a nucleus without formation of chromosomes. It is very uncommon and probably not a normal process. Consequently, it will not be discussed further. Meiosis and mitosis are both characterised by the appearance ...

Google previewCmplt Biology For Medical Ent Exams

by Kumar

Amitosis is an unusual process of nuclear division in which the nucleus is ...

Google previewModern Biology (1997)

by V. B. Rastogi

Amitosis is a simple type of cell division found in some bacteria, cy anobacteria, yeast. Amoeba, Paramecium, etc. 8. Somatic cells divide by mitosis and reproductive cells divide by meiosis to produce gametes. 9. GI and 62 phases are the ...

Google previewGenetics Classical To Modern (2007)

by P. K. Gupta

Amitosis is a direct nuclear division. It is often known as cleavage of nucleus without visible chromosomes. Free nuclear division is a normal mitosis where cell wall formation fails to take place. Budding is also a variation of mitosis where bud ...

Google previewA Dictionary of Plant Sciences (2012)

by Michael Allaby

amitosis. Nuclear division in which the cell is constricted into two without the * chromosomes becoming visible, the *nuclear envelope breaking down, or a * spindle forming. ammonium. fixation. The adsorption of ammonium ions (NH+4) into ...

Google previewCompanion Encyclopedia of the History of Medicine (2013)

by W. F. Bynum, Roy Porter

amitosis«. tonuclear division,and setoutthesteps followed, noting thatthe chromosomes divided longitudinally: this was still not universally acknowledged. Itwas also recognized that,in some species at least, there was a constant number of ...

Google previewA Dictionary of Genetics (2006)

by Robert C. King, William D. Stansfield, Pamela K. Mulligan

amitosis the division of a nucleus into two parts by constriction without the participation of a mitotic ...

Google previewEncyclopedia of Genetics, Genomics, Proteomics, and Informatics (2008)

by George P. Rédei

Amitosis containing mitosomes. some, ▷mitochondria ▷mitosome, ▷hydrogeno - Amitosis: Amitosis refers to nuclear division without the characteristic features of the mitotic apparatus, and involving the small (21 to 1,500 kb) and acentric ...

Google previewEncyclopedia of Genetics (2014)

by Eric C.R. Reeve

Trends in Genetics 12: 26-30 GLOSSARY acentromeric lacking a centromere amitosis rare type of nuclear division where the nucleus constricts without chromosome condensation or spindle formation chromosome walking a technique that ...

Google previewThe Facts on File Dictionary of Biology (2009)

by Robert Hine, Daintith

amitosis R3N + HX → R3NH+X– 2. Reaction with acid chlorides to give N- substituted acid amides (primary and secondary amines only): RNH2 + R′COCl → R′CONHR + HX amino acids /ă-mee-noh, am-ă-/ Derivatives of carboxylic acids ...

Google previewThe Encyclopaedia Britannica (1911)

A Dictionary of Arts, Sciences, Literature and General Information

or it may take place by simple direct division, amitosis, or fragmentation. Direct division is a much less common phenomenon than was formerly supposed to be the case. It occurs most frequently in old cells, or in cells which are placed ...

Google previewThe Practitioner's Medical Dictionary (1919)

Containing All the Words and Phrases Generally Used in Medicine and the Allied Sciences, with Their Proper Pronunciation, Derivation, and Definition by George Milbry Gould, Richard John Ernst Scott

amitosis (ah-mit-o'-sis) ...

Google previewBailliere's Nurses Dictionary for Nurses and Health Care Workers, 1st South Asia Edition (2016)

by Annu Kaushik

amitosis multiplication of cells by simple ...

Google previewAustralian Nurses' Dictionary (2012)

by Jennie King, Rhonda Hawley

amitosis (‚am'tohss) multiplication of cells by simple division or fission. ammonia ( 'mohni·) NH3.

Google previewMosby's Pocket Dictionary of Medicine, Nursing & Health Professions (2009)

by Mosby

amitosis/am′tō′sis/ [Gr, a, mitos, not thread], cell division in which there is binary fission of the nucleus and cytoplasm (as in bacteria) without the complex stages of chromosome separation that occur in ...

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Video about Amitosis

Amitosis Meaning

Video shows what amitosis means. Direct division of a cell by cleavage of the nucleus without the formation of chromosomes. Amitosis Meaning. How to ...

Scrabble value of A1M3I1T1O1S1I1S1

The value of this 8-letter word is 10 points. It is included in the first and second editions of the Official Scrabble Players Dictionary.

Anagrams of AMITOSIS

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  • OMASITIS

See also the blanagrams of Amitosis!

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