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 ?
Secondary outcome analyses showed that significantly more patients in the ablated group were free from any AF at 24 months, 85% with ablation and 71% with drug treatment, and significantly more ablated patients were free of symptomatic AF at 24 months, 93%, than patients on drug treatment, 84%.
Deaths occurred in three ablated patients and in four treated with drugs only.
The increase in volume percentage in the thin section of the ablated component compared to the conventional sand casting may have partly contributed to the higher strength of the ablated samples and could be due to the casting process, if metal is ladled from the top, middle or bottom of the original melt charge.
The ablated samples featured an improved distribution of particles in the casting compared to the conventionally cast samples.
The 't' test was used to verify the occurrence of significant fertility difference between ablated and non ablated females and also to compare spawning intervals between ablated and non ablated female size classes.
2003), unilaterally ablated Penaeus semisulcatus females, in 20 [degrees]C temperature, developed their ovary until the fourth stage, but did not spawn.
The Clara cells were most ablated 3 days after the exposure (data not shown), and Figure 1B shows that > 70% of ablation continued 14 days after the exposure.
We ablated the Clara cells in mice using the cytoselective toxicity of the metabolic products of naphthalene mediated by cytochrome P450 monooxygenase (3,24,25,34).
Her airway was secured with a laser endotracheal tube, and her mass was biopsied and ablated.
In the 43 patients treated, all 172 pulmonary veins were mapped with the REVELATION(R) Helix, with 43 of the veins having no AF potentials, and 129 pulmonary veins had potentials and were ablated with the REVELATION(R) Helix.
Second, should a patient not be satisfied with the initial surgical result or should the patient's eyesight change in the years following LASIK surgery, the original inlay potentially could be replaced with a new inlay that is then custom ablated to correct the new refractive error," concluded Peyman.
The laser automatically imparts a transition zone between the ablated and unablated areas of the cornea to facilitate healing.