catalyst

n. a substance that increases the rate of a chemical reaction without itself being used up. An enzyme is an organic catalyst.

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Psychology term of the day

November 19th 2024

Betz cell

a type of large pyramidal cell found in the fifth layer of the cerebral cortex (see cortical layers), mainly in motor cortex. Betz cells are associated with muscle movement and have a low threshold of stimulation. [Vladimir A. Betz (1834–1894), Russian anatomist]