# Involution

Also found in: Dictionary, Thesaurus, Medical, Legal, Wikipedia.
Related to Involution: involution of uterus

## involution

[‚in·və′lü·shən]
(biology)
A turning or rolling in.
(embryology)
Gastrulation by ingrowth of blastomeres around the dorsal lip.
(mathematics)
Any transformation that is its own inverse.
In particular, a correspondence between the points on a line that is its own inverse, given algebraically by x ′ = (ax + b)/(cx-a), where a 2+ bc ≠ 0.
A correspondence between the lines passing through a given point on a plane such that corresponding lines pass through corresponding points of an involution of points on a line.
(medicine)
The retrogressive change to their normal condition that organs undergo after fulfilling their functional purposes, as the uterus after pregnancy.
The period of regression or the processes of decline or decay which occur in the human constitution after middle life.

## Involution

(raising to a power), an algebraic operation consisting in repeating a quantity a n number of times:

The number a is the base of the power, n is the exponent, and an is the power. For example, 3x3x3x3 = 34 = 81. The second power of a number is called its square and the third power, its cube.

## Involution

(regression), in biology, a reduction or loss, in the process of evolution, of certain organs, and a simplification of their organization and functions (for example, various degrees of intestinal reduction in certain parasitic worms and arthropods). Degenerative changes in protozoans and bacteria caused by unfavorable conditions in the habitat are also called involutional. In medicine, the term sometimes refers to atrophy of organs and tissues, such as in aging.

References in periodicals archive ?
The difficulty of recovering the fluid infusion from the uterus during the its involution, especially at week 2 post calving (Kasimanickam et al.
Completion of treatment was defined as either 6 months of treatment or full involution (Whichever was earlier).
31) Because the renin-angiotensin system can stimulate angiogenesis, Itinteang et al suggested that propranol's inhibitory effect on the renin-angiotensin system might account for propranolol induced involution.
For the reverse inclusion, suppose [alpha] is a 3412-avoiding involution of length n - 1.
Uterine involution according to rectal palpation 35-45 days postpartum (Table 3).
In this study, we examined time-dependent alterations of VEGF levels in neonatal thymus involution and explored the possible mechanisms at cellular levels.
Now, let [sigma] be an irreducible involution of length 2n, n [greater than or equal to] 2, with no fixed points.
b) There exists an r-admissible involution [iota] of [Z.
Annie LaCourt, a former Arlington selectman, reviewed the Visual Budget program developed by Involution Studios, that allows officials -- and residents -- to easily "drill down'' the numbers to look at the budget as a whole, or how an individual taxpayer's money is being spent.
Cette DHT provoque une hypertrophie des glandes sebacees et une involution progressive du bulbe pileux d'ou une diminution de la phase anagene.
Numerical Godeaux surfaces with an involution in positive characteristic .

Site: Follow: Share:
Open / Close