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], or common table sugar, is composed of glucose and fructose.]]
dimer (n) - a person with balls the size of a dime. most character traits of a dimer are bitchy, dramatic, NOT normal, fucking stupid, WEIRD, wigger, and meanie. dimers are often spotted talking to the television, computer, birds, or girls with gaps in their teeth. also see porcupine balls.
]s are often found in vapor phase.]]

==Chemistry==
In ], a '''dimer''' refers to a ] composed of two identical subunits or ]s linked together. The molecules are connected with a ] or more weak interactions such as ]. An example of the former is dicyclopentadiene, which is a dimer of ]. It can refer to halide chemistry, involving halogen bonding. Its more common usage refers to dimers as 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. The ] is another dimer of interest, used for modeling hydrogen bonding in water.

==Biochemistry==
In ] and ], dimers of ]s like ]s and ]s are often observed. The dimerization of identical subunits is called '''homodimerization''', the dimerization of different subunits or unrelated ]s is called '''heterodimerization'''. Most dimers in biochemistry are not connected by ]s with the exception of ]s.
An example of this would be the enzyme ], which is made of two different ] chains.

===Examples===
* ]s:
** ]
* ]s:
** ]
** ]s:
*** ]s
** ]s
*** ] motif proteins
*** ]s
** ]s
** ]s
** ] βγ-subunit dimer
** ]
** ] (TIM)
** ]
** ]
** ]
** ]
** ]

==See also==
* ]
* ]
* ]
* ]

==External links==
*
*

]

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{{Cell-biology-stub}}
{{Chemistry-stub}}

]
]
]
]
]
]
]
]

Revision as of 20:18, 4 June 2007

Sucrose, or common table sugar, is composed of glucose and fructose.
Dimers of carboxylic acids are often found in vapor phase.

Chemistry

In chemistry, a dimer refers to a molecule composed of two identical subunits or monomers linked together. The molecules are connected with a covalent bond or more weak interactions such as hydrogen bond. An example of the former is dicyclopentadiene, which is a dimer of cyclopentadiene. It can refer to halide chemistry, involving halogen bonding. Its more common usage refers to dimers as 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. The water dimer is another dimer of interest, used for modeling hydrogen bonding in water.

Biochemistry

In biochemistry and molecular biology, dimers of macromolecules like proteins and nucleic acids are often observed. The dimerization of identical subunits is called homodimerization, the dimerization of different subunits or unrelated monomers is called heterodimerization. Most dimers in biochemistry are not connected by covalent bonds with the exception of disulfide bridges. An example of this would be the enzyme reverse transcriptase, which is made of two different amino acid chains.

Examples

See also

External links

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