Specific activity

Specific activity

Number of enzyme activity units per mass of protein. Often expressed as micromoles of product formed per unit time per milligramme of protein. Also used in radiochemistry to express the radioactivity per mass of material (radioactive + nonradioactive).

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Part of Speech: noun
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Industry/Domain: Earth science
Category: Soil science
Company: Soil Science Society of America
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specific activity

Medical devices; Radiology equipment

Unit pertaining to the disintegrations per gram of a radioisotope (mettler fa jr, upton ac: medical effects of ionizing radiation, 3rd ed. Philadelphia, pa: saunders elsevier, ...

specific activity

Earth science; Soil science

Number of enzyme activity units per mass of protein. Often expressed as micromoles of product formed per unit time per milligram of protein. Also used in radiochemistry to ...

specific activity

Automotive; Automobile

The conversion rate of a given catalytic converter per unit volume; it is desirable to have a high specific activity, i.e., a small but efficient converter.

specific activity

Biology; Biochemistry; Molecular biology

A measure of function PER unit, e.g. enzyme activity PER mg of protein, or radioactivity PER weight (or PER volume, or PER mole) (more correctly known as specific radioactivity).

B cell specific activator protein

Medical; Health care; Medicine

A transcription factor that is essential for cell differentiation of B-lymphocytes. It functions both as a transcriptional activator and repressor to mediate B-cell commitment.

activity

Energy; Nuclear energy

The rate of disintegration (transformation) or decay of radioactive material per unit time. The units of activity (also known as radioactivity) are the curie (Ci) and the ...

swamp

Earth science; Soil science

Swamp is an area which is flooded or drenched with water and related to plunge or cause to sink.

semiarid

Earth science; Soil science

Fairly dry because of low rainfall. Semiarid regions, such as a prairie, usually have enough water for grasses and some bushes to grow.

talus

Earth science; Soil science

A sloping pile of small pieces of rock that is at the base of a cliff is called talus.

silt

Earth science; Soil science

Small grains or particles of broken down rock. Silt particles are smaller than grains of sand but larger than the particles in clay.

talc

Earth science; Soil science

A very soft, white or green mineral found in igneous and metamorphic rocks is called talc.

stone

Earth science; Soil science

A general term for rock, especially as used in construction. A hard clump of minerals that forms in a part of body.

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The Flowers of War

A war film about the life and death of a group of girls caught in the middle of gunfires in Nanjing during the Japanese invasion of China in 1937. ...