fission

1. The act of splitting, e.g., amitotic division of a cell or its nucleus. 2. Splitting of the nucleus of an atom. [L. fissio, a cleaving, fr. findo, pp. fissus, to cleave]
- binary f. simple f. in which the two new cells are approximately equal in size.
- bud f. SYN: gemmation.
- multiple f. division of the nucleus, simultaneously or successively, into a number of daughter nuclei, followed by division of the cell body into an equal number of parts, each containing a nucleus.
- simple f. division of the nucleus and then the cell body into two parts. SEE ALSO: binary f..

* * *

fis·sion 'fish-ənalso 'fizh- n
1) a method of reproduction in which a living cell or body divides into two or more parts each of which grows into a whole new individual
2 a) CLEAVAGE (2)
b) the splitting of an atomic nucleus resulting in the release of large amounts of energy called also nuclear fission
fis·sion vb, fis·sioned; fis·sion·ing 'fish-(ə-)niŋalso 'fizh-
fis·sion·al 'fish-ən-əlalso 'fizh- adj

* * *

n.
a method of asexual reproduction in which the body of a protozoan or bacterium splits into two equal parts (binary fission), as in the amoeba, or more than two equal parts (multiple fission), for example sporozoite formation in the malarial parasite (see Plasmodium). The resulting products of fission eventually grow into complete organisms.

* * *

fis·sion (fishґən) [L. fissio] 1. the act of splitting. 2. a form of asexual reproduction in which the cell divides into two or more daughter parts of equal size, each of which becomes a new, independent organism; it is seen chiefly in unicellular organisms such as bacteria. See also binary f. and multiple f.

Medical dictionary. 2011.

Look at other dictionaries:

  • Fission — nucléaire La fission nucléaire La fission nucléaire est le phénomène par lequel le noyau d un atome lourd (noyau qui contient beaucoup de nucléons, tels les noyaux d uranium et de plutonium) est divisé en plusieurs nucléides plus légers. Cette… …   Wikipédia en Français

  • fission — [ fisjɔ̃ ] n. f. • 1938 biol.; mot angl. 1939 phys.; du lat. fissus « fendu » ♦ Phys. Division d un noyau atomique en deux ou plusieurs nucléides qui peuvent subir ensuite une série de transmutations. Énergie dégagée lors d une fission obtenue… …   Encyclopédie Universelle

  • Fission — is a splitting of something into two parts.Fission may refer to: *In physics, nuclear fission is a process where a large atomic nucleus (such as uranium) is split into two smaller nuclei *In biology, binary fission is the mitosis process whereby… …   Wikipedia

  • fission — UK US /ˈfɪʃən/ noun [U] ENVIRONMENT ► a process in which the nucleus of an atom divides and releases a large amount of energy: atomic/nuclear fission »Industrialized nations should increase their efforts in supporting energy efficiency, renewable …   Financial and business terms

  • fission — [fish′ən, fizh′ən] n. [L fissio < fissus, pp. of findere, to cleave, split < IE base * bheid , to split > BITE] 1. a splitting apart; division into parts 2. NUCLEAR FISSION 3. Biol. a form of asexual reproduction, found in various simple …   English World dictionary

  • Fission — Fis sion, n. [L. fissio. See {Fissure}.] 1. A cleaving, splitting, or breaking up into parts. [1913 Webster] 2. (Biol.) A method of asexual reproduction among the lowest (unicellular) organisms by means of a process of self division, consisting… …   The Collaborative International Dictionary of English

  • Fission — bezeichnet: Kernspaltung, die Spaltung von Atomkernen Schizotomie, die Teilung einzelliger Lebewesen in zwei gleiche Teile Fission (Band), eine schwedische Metal Band Diese Seite ist eine Begriffskläru …   Deutsch Wikipedia

  • fission — [n] splitting atomic reaction, atom smashing, dividing, division, nuclear fission, parting, severance, splitting the atom, thermonuclear reaction; concept 500 …   New thesaurus

  • fission — ► NOUN 1) the action of splitting or being split into two or more parts. 2) a reaction in which an atomic nucleus splits in two, releasing much energy. 3) Biology reproduction by means of cell division. ► VERB ▪ undergo fission. DERIVATIVES… …   English terms dictionary

  • fission — fission. См. деление. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • fission — fission. = division (см.). (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.