ablation

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ablation

1. Medicine the surgical removal of an organ, structure, or part
2. Astronautics the melting or wearing away of an expendable part, such as the heat shield of a space re-entry vehicle on passing through the earth's atmosphere
3. Geology the wearing away of a rock or glacier

ablation

(ab-lay -shŏn) The loss of material from the surface of a moving body as a result of vaporization, friction, etc. For example, atmospheric atoms and molecules erode the surface of a meteoroid and damage the protective heat shield of a returning space shuttle.

Ablation

 

in glaciology, the wasting of the mass of a glacier or snow cover as a result of thawing, evaporation, or mechanical removal—for example, wind ablation or the falling of icebergs. It is caused chiefly by climatic factors.

Three types of ablation are distinguished according to place of appearance: subglacial (or bottom), internal, and surface. The internal heat of the earth, springs (particularly warm ones) surfacing in the glacier bed, and heat caused by the friction of the glacier in its bed are some of the causes of subglacial ablation. Internal ablation is caused by friction between the glacier components and by the circulation of water and air. The glacier surface receives warmth predominantly from solar radiation and from the air. The thermal balance of the glacier surface is the basis of all surface ablation processes. The term “ablation” is sometimes used as well as a synonym for “surface washoff.”

ablation

[ə′blā·shən]
(aerospace engineering)
The intentional removal of material from a nose cone or spacecraft during high-speed movement through a planetary atmosphere to provide thermal protection to the underlying structure.
(geology)
The wearing away of rocks, as by erosion or weathering.
(hydrology)
The reduction in volume of a glacier due to melting and evaporation.
(medicine)
The removal of tissue or a part of the body by surgery, such as by excision or amputation.
References in periodicals archive ?
Researchers concluded the following after comparing conventionally sand cast and ablated aluminum metal matrix composites.
The dispersion of the reinforcements was more uniform in the ablated samples than in the conventionally cast samples.
The dendrite arm spacing/cell size of the ablated sample was 0.
The experimental result for the analyzed reproduction performance parameters, according to the three length classes of ablated and non ablated females are show on Tables 1 and 2, respectively.
acanthurus individual spawn number, in this study, varied from 1 to 7, on ablated females as well as on non ablated females.
The U test demonstrated there was no significant difference for the number of spawns between the two treatments, and also when the three size classes for ablated and non ablated females are compared (Table 3).
This result does not agree with the one found by Santos and Pinheiro (2000), which showed, for unilaterally ablated M.
In this research study, ablated females present an interval of spawns varying from 1 to 8 days, an average of 3.
This result confirms the one observed for Penaeus schmitti ablated females, which took less time for ovary maturation if compared to non ablated females (NASCIMENTO et al.
In the present work, a new maturation cycle right after the spawn was observed, confirming the study mentioning unilateral ablation as the best way of promoting gonadal maturation by endocrine imbalance relating it to the reduction of the Gonadal Inhibitor Hormone (GIH) in the hemolymph on ablated females (BROWDY; SAMOCHA, 1985).
The Pearson Correlation (r) demonstrated that there was no dependent relationship between incubation period (days) and the water temperature on ablated females (r = -0.
In summary, we investigated gene expression of MMP-2 and MMP-9 in the lungs after inhalation of crystalline silica in mice in which the Clara cells had been ablated with naphthalene.