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| ==Chemistry== | ==Chemistry== | ||
| In ], a '''dimer''' is a ] composed of two similar subunits or monomers linked together. It is a special case of a ]. Among the most common dimers are certain types of ]; ], for example, is a dimer of a ] molecule and a ] molecule. | In ], a '''dimer''' is a ] composed of two similar subunits or monomers linked together. It is a special case of a ]. Among the most common dimers are certain types of ]; ], for example, is a dimer of a ] molecule and a ] molecule. | ||
| A '''physical dimer''' is a term that designates the case where intermolecular interaction brings two identical molecules closer together than other molecules. There are no ]s between the physical dimer molecules. ] is such a case where ]s provide the interaction. | A '''physical dimer''' is a term that designates the case where intermolecular interaction brings two identical molecules closer together than other molecules. There are no ]s between the physical dimer molecules. ] is such a case where ]s provide the interaction. | ||
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| In ], a dimer is a ] complex made up of two subunits. In a '''homodimer''' the two subunits are identical, and in a '''heterodimer''' they differ (though they are often still very similar in structure). The subunits do not need to be covalently linked, and usually aren't. | In ], a dimer is a ] complex made up of two subunits. In a '''homodimer''' the two subunits are identical, and in a '''heterodimer''' they differ (though they are often still very similar in structure). The subunits do not need to be covalently linked, and usually aren't. | ||
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Revision as of 03:08, 17 November 2005
Chemistry
In chemistry, a dimer is a molecule composed of two similar subunits or monomers linked together. It is a special case of a polymer. Among the most common dimers are certain types of sugar; sucrose, for example, is a dimer of a glucose molecule and a fructose molecule.
A physical dimer is a term that designates the case where intermolecular interaction brings two identical molecules closer together than other molecules. There are no covalent bonds between the physical dimer molecules. Acetic acid is such a case where hydrogen bonds provide the interaction.
Biology
In biology, a dimer is a protein complex made up of two subunits. In a homodimer the two subunits are identical, and in a heterodimer they differ (though they are often still very similar in structure). The subunits do not need to be covalently linked, and usually aren't.
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