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首页> 外文期刊>Biophysical Chemistry: An International Journal Devoted to the Physical Chemistry of Biological Phenomena >Why is the human visual system sensitive only to light of wavelengths from approximately 760 to 380 nm? An answer from thermochemistry and chemical kinetics.
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Why is the human visual system sensitive only to light of wavelengths from approximately 760 to 380 nm? An answer from thermochemistry and chemical kinetics.

机译:为什么人类视觉系统仅对大约760至380 nm波长的光敏感?热化学和化学动力学的答案。

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摘要

The range of visible light has been explained by the knowledge available of gas-phase thermochemistry and chemical kinetics. The C, C-pi bond dissociation energy at the 11 and 12 positions of the rhodopsin complex is estimated to be approximately 37.4+/-1.5 kcal/mol. This energy is just equivalent to wavelength of the red limit of the visible light. The photons of the violet limit (approx. 75.2 kcal/mol) can break the weakest C-C and H-C bonds in important species involved in the photo-induced cis-trans isomerization cycle and can stop the visual cycle.
机译:可见光的范围已通过气相热化学和化学动力学的可用知识进行了解释。在视紫红质复合物的11和12位上的C,C-pi键解离能估计为约37.4 +/- 1.5kcal / mol。该能量仅等于可见光红色极限的波长。紫罗兰色极限的光子(约75.2 kcal / mol)可以破坏与光诱导的顺反异构化循环有关的重要物种中最弱的C-C和H-C键,并可以终止视觉循环。

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