1. A turning inward, upside down, or in any direction contrary to the existing one. 2. Conversion of a disaccharide or polysaccharide by hydrolysis into a monosaccharide; specifically, the hydrolysis of sucrose to d-glucose and d-fructose; so called because of the change in optical rotation. 3. Alteration of a DNA molecule made by removing a fragment, reversing its orientation, and putting it back into place. 4. Heat-induced transition of silica, in which the quartz tridymite or cristobalite changes its physical properties as to thermal expansion. 5. Conversion of a chiral center into its mirror image. [L. inverto, pp. -versus, to turn upside down, to turn about]
- i. of chromosomes a chromosome aberration resulting from a double break in a segment of the chromosome, with end for end rotation of the fragment between the fracture lines, and refusion of the fragments; this results in reversal of the order of genes in that segment.
- paracentric i. i. in a chromosome of a single segment in which the centromere is not included.
- pericentric i. i. in a chromosome of a single segment that includes the centromere.
- i. of the uterus a turning of the uterus inside out, usually following childbirth.
- visceral i. SYN: situs inversus viscerum.

* * *

in·ver·sion in-'vər-zhən, -shən n
1) a reversal of position, order, form, or relationship: as
a) a dislocation of a bodily structure in which it is turned partially or wholly inside out <\inversion of the uterus>
b) the condition (as of the foot) of being turned or rotated inward compare EVERSION (2)
d) a breaking off of a chromosome section and its subsequent reattachment in inverted position also a chromosomal section that has undergone this process
2 a) the conversion of dextrorotatory sucrose into a levorotatory mixture of glucose and fructose
b) a change from one stereochemical figuration at a chiral center in a usu. organic molecule to the opposite configuration that is brought about by a reaction in which a substitution of one group is made for a different group

* * *

1. the turning inwards or inside-out of a part or organ: commonly applied to the state of the uterus after childbirth when its upper part is pulled through the cervical canal.
2. a chromosome mutation in which a block of genes within a chromosome are in reverse order, due to that section of the chromosome becoming inverted. The centromere may be included in the inverted segment (pericentric inversion) or not (paracentric inversion).

* * *

in·ver·sion (in-vurґzhən) [L. inversio; in into +vertere to turn] 1. a turning inward, inside out, upside down, or other reversal of the normal relation of a part. 2. in genetics, a chromosomal aberration caused by the inverted reunion of a chromosome segment after breakage of a chromosome at two points, resulting in a change in sequence of genes or nucleotides; e.g., the sequence abcdefg may be inverted to abfedcg. See illustration at aberration.

Inversion and eversion of the foot.

Medical dictionary. 2011.


Look at other dictionaries:

  • Inversion — Inversion …   Deutsch Wörterbuch

  • inversion — [ ɛ̃vɛrsjɔ̃ ] n. f. • 1529; lat. inversio, de invertere « retourner » I ♦ A ♦ Sens spéciaux 1 ♦ Déplacement (d un mot ou d un groupe de mots) par rapport à l ordre normal ou habituel de la construction. Inversion du sujet dans l interrogation (ex …   Encyclopédie Universelle

  • Inversion — In*ver sion, n. [L. inversio: cf. F. inversion. See {Invert}.] [1913 Webster] 1. The act of inverting, or turning over or backward, or the state of being inverted. [1913 Webster] 2. A change by inverted order; a reversed position or arrangement… …   The Collaborative International Dictionary of English

  • inversión — f. anat. patol. Transposición visceral, por ejemplo, situación del corazón a la derecha. Medical Dictionary. 2011. inversión trast …   Diccionario médico

  • inversión — sustantivo femenino 1. Acción y resultado de invertir: inversión de tiempo, inversión de esfuerzo. No puede conseguirse una inversión del voto tradicional con facilidad. 2. Dinero que se invierte en un negocio o en una operación financiera: He… …   Diccionario Salamanca de la Lengua Española

  • inversion — In grammar, inversion is the process by which the normal order of words, with the subject followed by the verb and then by the object or complement (if any) as in We play football on Saturdays is broken by putting the subject after the verb (as… …   Modern English usage

  • inversión — (Del lat. inversĭo, ōnis). 1. f. Acción y efecto de invertir. 2. homosexualidad. 3. Mús. Colocación de las notas de un acorde en posición distinta de la normal, o modificación de una frase o motivo de manera que los intervalos se sigan en… …   Diccionario de la lengua española

  • inversion — (n.) 1550s, from L. inversionem (nom. inversio) an inversion, noun of action from pp. stem of invertere (see INVERT (Cf. invert)) …   Etymology dictionary

  • inversion — Inversion. s. f. Terme de Grammaire. Transposition, changement de l ordre dans lequel les mots ont accoustumé d estre rangez dans le discours ordinaire. Inversion dure. il y a de trop frequentes inversions dans ce discours …   Dictionnaire de l'Académie française

  • inversion — ► NOUN 1) the action of inverting or the state of being inverted. 2) (also temperature or thermal inversion) a reversal of the normal decrease of air temperature with altitude, or of water temperature with depth. DERIVATIVES inversive adjective …   English terms dictionary

  • inversion — inversion. См. инверсия. (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”