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arXiv physics/0310070physics.bio-ph
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α-螺旋蛋白质双振子束缚态的弛豫通道

Relaxation channels of two-vibron bound states in α-helix proteins

Vincent J. C. Pouthier, Cyril Falvo

摘要:

研究了非简谐α-螺旋蛋白质中双振子束缚态的弛豫通道。指出弛豫起源于缀饰非简谐振动子与剩余声子之间的相互作用。这种相互作用是负责的两个振动子本征态介导的声子吸收和声子发射之间的跃迁的发生。在生物温度下,它示出的弛豫速率并不显着依赖于在该过程中所涉及的两个振动子状态的性质。因此,束缚态和自由态的寿命具有相同的数量级,并且对于实际参数,其范围在0.1和1.0 ps之间。相反,弛豫通道强烈地依赖于双振子态的性质,这是双振子束缚态的呼吸者行为的结果。

英文摘要:

Relaxation channels for two-vibron bound states in an anharmonic alpha-helix protein are studied. It is pointed out that the relaxation originates in the interaction between the dressed anharmonic vibrons and the remaining phonons. This interaction is responsible for the occurrence of transitions between two-vibron eigenstates mediated by both phonon absorption and phonon emission. At biological temperature, it is shown that the relaxation rate does not significantly depends on the nature of the two-vibron state involved in the process. Therefore, the lifetime for both bound and free states is of the same order of magnitude and ranges between 0.1 and 1.0 ps for realistic parameters. By contrast, the relaxation channels strongly depend on the nature of the two-vibron states which is a consequence of the breather-like behavior of the two-vibron bound states.

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