unit of biological activity

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• Unit, international (IU) — An international unit (IU) is an internationally accepted amount of a substance. This type of measure is used for the fat soluble vitamins (such as vitamins A, D and E) and certain hormones, enzymes, and biologicals (such as vaccines). The… …   Medical dictionary

• Biological psychology — In psychology, biological psychology, also known as biopsychology, psychobiology, or behavioral neuroscience [http://www.m w.com/cgi bin/dictionary?sourceid=Mozilla search va=psychobiology Merriam Webster s Online Dictionary » Psychobiology] >]… …   Wikipedia

• biological development — Introduction       the progressive changes in size, shape, and function during the life of an organism by which its genetic potentials (genotype) are translated into functioning mature systems (phenotype). Most modern philosophical outlooks would …   Universalium

• unit — 1. One; a single person or thing. 2. A standard of measure, weight, or any other quality, by multiplications or fractions of which a scale or system is formed. 3. A group of persons or things considered as a whole because of mutual activities or… …   Medical dictionary

• Biological half-life — For other uses, see Half life (disambiguation). The biological half life or elimination half life of a substance is the time it takes for a substance (for example a metabolite, drug, signalling molecule, radioactive nuclide, or other substance)… …   Wikipedia

• Biological pigment — The Blue Morpho butterfly, native to Central America, derives its distinctive blue coloring from iridescence rather than from pigmentation. Biological pigments, also known simply as pigments or biochromes[1] are substances produced by living… …   Wikipedia

• Biological neuron model — A biological neuron model (also known as spiking neuron model) is a mathematical description of the properties of nerve cells, or neurons, that is designed to accurately describe and predict biological processes. This is in contrast to the… …   Wikipedia

• International unit — In pharmacology, the International Unit is a unit of measurement for the amount of a substance, based on biological activity or effect. It is abbreviated as IU, as UI (Spanish unidad internacional or French unité internationale or Italian unità… …   Wikipedia

• international unit — n the amount of specific physiological activity of a standardized preparation (as of a vitamin) that is agreed upon as an international standard esp. for comparison with other biologicals containing the substance in impure form or with a related… …   Medical dictionary

• IU (international unit) — An international unit (IU) is an internationally accepted amount of a substance. This type of measure is used for the fat soluble vitamins (such as vitamins A, D and E) and certain hormones, enzymes, and biologicals (such as vaccines). The… …   Medical dictionary

• international unit of vitamin D — the specific biological activity of 0.025 microgram of cholecalciferol …   Medical dictionary