Half-life

Half-life

When a property (e.g. radioactivity, enzyme activity, etc.) decreases at a rate proportional to its concentration, the time, t_½, taken for the property to decrease to one-half its initial value; related to the first-order rate constant, k, by t_½=ln2/k.

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Part of Speech: noun
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Industry/Domain: Biology
Category: Biochemistry; Molecular biology
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half-life

Internet; Internet communication

A measurement for the amount of time a radioactive substance takes to lose half of its atoms. In technology, it refers to the amount of time that it takes for a storage device to ...

half-life

Energy; Nuclear energy

The time in which one half of the atoms of a particular radioactive substance disintegrate into another nuclear form. Measured half-lives vary from millionths of a second to ...

half-life

Natural environment; Coral reefs

The time required for a radioactive substance to lose half of its nuclei.

half-life

Medical devices; Radiology equipment

The time any substance takes to decay by half of its original amount. See also biological half-life, decay constant, effective half-life, radioactive half-life.

half-life

Printing & publishing; Publishing

The time it takes for a sensational news item to migrate from a front-page (qv) report to a back-page filler (qv), or for a spectacular entertainment to lose public interest; ...

half-life

Archaeology; Evolution

The amount of time it takes for one-half of the atoms of a radioactive material to decay to a stable form. For example, the half-life of carbon-14 is 5,568 years.

calcareous

Biology; Biochemistry

The body parts of animals which contain calcium as shells, bones and exoskeleton and they protect the animals, are called as calcareous.

humus

Biology; Biochemistry

Humus is a dark material in the soil that is formed from decaying plants and leaves.

red blood cell

Biology; Biochemistry

A blood cell that carries oxygen and carbon dioxide to all body tissues is called as red blood cell.

rotten

Biology; Biochemistry

Anything that has gone bad; smelly; decayed; evil; unpleasant which is likely to break due to rot is called as rotten.

aerobic

Biology; Biochemistry

Needing or using oxygen to live.Living things that can exist only in environments that contain oxygen are aerobic.

anderogen

Biology; Biochemistry

One of the hormones that controls the physical development in males. Testosterone is an androgen.

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