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 ?
This clearly shows the greater effect of biological degradation (in both physical and chemical ways) on the clearcoat having lower [T.sub.g] and crosslink-ing density.
Biological degradation of tannins in Sericealespedeza by the white rot fungi Cerporiopsis subvermispora and Cyanthus stercoreus analysed by solid--state 13-C NMR spectroscopy.
Henkel has introduced two new water-soluble Multan metal removal lubricants formulated to generate minimal foam and be used continuously for years with minimal biological degradation. Users of traditional metal cutting fluids often experience problems with foam buildup and bacteria growth.
By natural design, lignocellulose has evolved to have some crystalline structures with closed rings, lacking open bonds to react with enzymes, thus resisting biological degradation. While scientists are engineering new enzymes that could break down lignocellulosic faster, the thermochemical conversion still has something important to offer: It can break down the long carbon chain much faster than biological means, typically on the order of minutes instead of days at present.
Indian coffee is eco friendly considering that it is mandatory for each coffee farmer to treat the effluents from his pulp house by a process of aerobic and anaerobic lagooning, again a natural method of biological degradation. Even when offering coffee for sale, we pack our coffees only in food grade jute bags, which not only preserve the intrinsic quality of the coffee beans stored in these bags, but also preserve the environment, by being bio degradable.
We knew that the biological degradation rate in the receiving water decreased with increasing molecular weight.
Therefore, biological degradation has to be stopped for a certain period.
About two-thirds of agricultural land has been degraded over the past 50 years by erosion, salinization, soil compaction, nutrient depletion, biological degradation, and pollution.
The resistance to biological degradation of composite wood products is improved by applying a suitable aqueous dispersion of zinc borate onto the fibers to uniformly distribute and to adhere the zinc borate to the strands of the wood composite, applying a suitable adhesive to the wood strands, forming a strand lay-up and consolidating a lay-up under heat and pressure to form a consolidated product with zinc borate uniformly distributed therethrough.
Last August, EKOR was certified by the Ukrainian government where testing acknowledged its lack of chemical or biological degradation even after long-term exposure to radiation.
They are designed to optimize the biological degradation of the sugars in the waste water.
Food plant wastes are largely organic, with a high carbohydrate content, and are decomposed by biological degradation. This is carried out mostly by aerobic microorganisms that require large quantities of oxygen to completely oxidize carbohydrates and other organic materials to carbon dioxide and water, and to convert nitrogenous residues to nitrate.

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