Degradation

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degradation

[‚deg·rə′dā·shən]
(computer science)
Condition under which a computer operates when some area of memory or some units of peripheral equipment are not available to the user.
(geology)
The wearing down of the land surface by processes of erosion and weathering.
(hydrology)
Lowering of a stream bed.
Shrinkage or disappearance of permafrost.
(organic chemistry)
Conversion of an organic compound to one containing a smaller number of carbon atoms.
(physics)
Loss of energy of a particle, such as a neutron or photon, through a collision.
(thermodynamics)
The conversion of energy into forms that are increasingly difficult to convert into work, resulting from the general tendency of entropy to increase.

Degradation

A loss of the original characteristics, or weakening of an element by erosion; a disintegration of paint by heat, moisture, sunlight or natural weathering. Also harmful action caused by human activity, such as vandalism.

Degradation

 

in biology, the simplification in structure and function of animals or plants under the influence of conditions of existence that have altered. Distinction is made between ontogenetic degradation—that is, simplification of the organism in the final stages of its development as compared with the initial stages—and phylogenetic degradation, or simplification of the structure of descendants as compared with the organization of their ancestors.

degradation

Disintegration of a paint film by heat, moisture, sunlight, or natural causes.
References in periodicals archive ?
The literature presents studies concerning the phase morphology obtained during melt extrusion blending and the effects of important parameters such as screw profile, distributive and dispersive mixing degree, reaction conversion, residence time distribution (RTD), and degradative processes (2-18).
They found that during processing some crosslinking may occur in the polyethylene as a consequence of degradative processes.
In fact, estrogens are involved in the metabolic pathway of several collagens displaying cross-linkage of their [alpha] chains (31,32), whereas bisphosphonates affect both synthetic (33) and degradative (14) pathways of the cross-links in bone cells as well as the composition and content of cross-links in rat bone (34).
5, puts into evidence the initial stages of the degradative process in more detail.
Evidently, the intergallery spacing in short stacks is dominated by degradative behavior of the quaternary ammonium ion intercalant of the organoclay (Hofmann elimination mechanism), and as [d.
Dihydropyrimidine dehydrogenase is the initial enzymatic step in the degradative pathway of the pyrimidine bases uracil and thymine (Fig.
The present study focuses on the degradative effect of coextrusion processing on the physical and chemical properties of commercial HIPS (Basf Polystyrol 2710, specially used in the manufacture of refrigerator parts via thermoforming of coextruded sheet).
The mastication had a clear degradative effect on microgel in raw NR.
The heat aging conditions were not severe, but above 70[degrees]C natural rubber tends to start undergoing degradative processes that are not typical at room temperature, so it was considered more appropriate to go no higher; and 70 hours in an air circulating oven is an appreciable time for aging to occur.
This repair leads to an increase in degradative enzyme activity, sites of focal wound healing and tissue remodelling.