ELECTRON-SPIN RELAXATION MEASUREMENTS ON THE BLUE-COPPER PROTEIN PLASTOCYANIN - DEVIATIONS FROM A POWER LAW TEMPERATURE-DEPENDENCE

被引：28

作者：

DREWS, AR ^{[1
]}

THAYER, BD ^{[1
]}

STAPLETON, HJ ^{[1
]}

WAGNER, GC ^{[1
]}

GIUGLIARELLI, G ^{[1
]}

CANNISTRARO, S ^{[1
]}

机构：

[1] UNIV PERUGIA,DEPT PHYS,I-06100 PERUGIA,ITALY

来源：

BIOPHYSICAL JOURNAL | 1990年 / 57卷 / 01期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/S0006-3495(90)82517-0

中图分类号：

Q6 [生物物理学];

学科分类号：

071011 ;

摘要：

Electron spin relaxation rates over the temperatue range 1.41–15.6 K are presented for the copper-containing protein plastocyanin. Measurements are described for two samples, each derived from a different preparation of equivalent purity, for which the ionic, redox, and protein compositions varied slightly. X-band data are analyzed in terms of a phonon-limited direct process and a Raman relaxation process, where the index of the Raman transport integral is treated as a fitting parameter. Both samples yield rate data at the highest temperatures that are characterized by small deviations from a simple Tn power law dependence, with n in the range 4.8–5.2. These deviations are most easily quantified when the Tn power law fits are compared with similar functions that allow for a finite cutoff in the phonon density of states corresponding to Debye temperatures between 90 and 100 K with n in the range 5.0–5.5. © 1990, The Biophysical Society. All rights reserved.

引用

页码：157 / 162

页数：6

共 32 条

[1] RELAXATION AND NONRADIATIVE DECAY IN DISORDERED-SYSTEMS .3. STATISTICAL CHARACTER OF RAMAN (2-QUANTA) SPIN-LATTICE RELAXATION [J].