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The lifetime of the soliton in the improved Davydov model at the biological temperature 300 K for protein molecules |
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| Authors: | Pang Xiao-feng |
| Institution: | (1) Institute of High-energy Electronics, University of Electronic Science and Technology of Chengdu 610054, PR China and International Center for Material Physics, Chinese Academy of Sciences, Shenyang 110015, PR China and Department of Physics, University of Kaiserslautern, 67663, Kaiserslautern, Germany and Chinese Center of Advanced Science and Technology (World Lab.) PO Box 8730, Beijing 100080, PR China, CN |
| Abstract: | We study the effects of quantum fluctuations and thermal perturbations on the lifetime of the soliton in the improved Davydov model proposed by us with two-quanta and with an added interaction. By using quantum perturbation theory, we compute the soliton lifetime for a wide ranges of parameter values relevant for protein molecules. The lifetime of the new soliton at the biological temperature 300 K is of the order of 10-10 second or τ/τ≥ 500 for parameters appropriate to α-helical protein molecules. This shows clearly that the new soliton in the improved model is a viable mechanism for the bio-energy transport in the α-helix region of proteins. Received 7 January 1999 and Received in final form 16 August 2000 |
| Keywords: | PACS 87 15 He Dynamics and conformational changes – 31 50 +w Excited states – 36 20 -r Macromolecules and polymer molecules – 65 20 +w Heat capacities of liquids |
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