## Term: SBO:0000282

### Name

dissociation constant### Definition

Equilibrium constant that measures the propensity of a larger object to separate (dissociate) reversibly into smaller components, as when a complex falls apart into its component molecules, or when a salt splits up into its component ions. The dissociation constant is usually denoted Kd and is the inverse of the affinity constant.

### Synonym(s)

- Kd

### MathML

<math xmlns="http://www.w3.org/1998/Math/MathML"> <lambda> <bvar><ci definitionURL="http://biomodels.net/SBO/#SBO:0000338">koff</ci></bvar> <bvar><ci definitionURL="http://biomodels.net/SBO/#SBO:0000341">Kon</ci></bvar> <apply> <divide/> <ci>koff</ci> <ci>Kon</ci> </apply> </lambda> </math>

### Rendered equation

### Comment

Created on November 27 2006 by Nicolas Le Novere

### Parent(s)

- SBO:0000281 equilibrium constant (is a)
- SBO:0000309 dissociation characteristic (is a)

### Children

- SBO:0000283 acid dissociation constant (is a)
- SBO:0000363 activation constant (is a)
- SBO:0000261 inhibitory constant (is a)

### Miscellaneous

Date of creation: 27 November 2006, 23:10

Date of last modification: 26 February 2008, 17:51