constant

constant /con·stant/ (kon´stint)

1. stable; not subject to change.

2. a quantity that is not subject to change.

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association constant  a measure of the extent of a reversible association between two molecular species.

Avogadro's constant  see under number.

binding constant  association c.

Michaelis constant  a constant representing the substrate concentration at which the velocity of an enzyme-catalyzed reaction is half maximal; symbol K M or K m.

sedimentation constant  see under coefficient.

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con·stant (knstnt)

adj.

1. Continually occurring; persistent.

2. Unchanging in nature, value, or extent; invariable.

n.

1. A quantity assumed to have a fixed value in a specified mathematical context.

2. An experimental or theoretical condition, factor, or quantity that does not vary or that is regarded as invariant in specified circumstances.

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constant

a datum, fact or principle that is not subject to change.

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Michaelis constant (K_m)

a dissociation constant for the substrate concentration in an enzymatic reaction.

constant (C) region

see constant domains.