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vibration theory of olfaction
The Vibration theory of smell proposes that a molecule's smell character is due to its vibrational frequency in the infrared range. This controversial theory is an alternative to the more widely accepted shape theory of olfaction, which proposes that a molecule's smell character is due to its molecular size, molecular shape and functional groups.
==Introduction==
The current vibration theory has recently been called the "swipe card" model, in contrast with "lock and key" models based on shape theory.〔(【引用サイトリンク】title=Access : Rogue theory of smell gets a boost : Nature News )〕 As proposed by Luca Turin, the odorant molecule must first fit in the receptor's binding site. Then it must have a vibrational energy mode compatible with the difference in energies between two energy levels on the receptor, so electrons can travel through the molecule via inelastic electron tunneling, triggering the signal transduction pathway. The vibration theory is discussed in a popular, but controversial book by Chandler Burr.
The odor character is encoded in the ratio of activities of receptors tuned to different vibration frequencies, in the same way that color is encoded in the ratio of activities of cone cell receptors tuned to different frequencies of light. Although vibration theory has been offered as an explanation of odor character, it does not explain intensity—why some odors are stronger than others at the same concentrations—nor the differing odors of enantiomers, which possess identical vibrations.
Some studies support vibration theory while others challenge its findings.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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