GLASS-TRANSITION OF ZN-SUBSTITUTED MYOGLOBIN PROBED BY ABSORPTION AND SITE-SELECTIVE FLUORESCENCE SPECTROSCOPIES

被引：15

作者：

AHN, JS ^{[1
]}

KITAGAWA, T ^{[1
]}

KANEMATSU, Y ^{[1
]}

NISHIKAWA, Y ^{[1
]}

KUSHIDA, T ^{[1
]}

机构：

[1] OSAKA UNIV,DEPT PHYS,TOYONAKA,OSAKA 560,JAPAN

来源：

JOURNAL OF LUMINESCENCE | 1995年 / 64卷 / 1-6期

关键词：

D O I：

10.1016/0022-2313(95)00014-H

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The temperature dependence of absorption and laser-induced fluorescence spectra including the resonance line has been measured for Zn-substituted myoglobin (ZnMb) in the temperature range between 4 and 300 K. The spectral shape observed below 180 K has been found to be well explained by assuming that the site-energy distribution function is temperature independent and is equal to that determined at 4 K. This may indicate that ZnMb is glass-like below 180 K. The spectral shape of the absorption spectrum at temperatures higher than 180 K has been explained by using a configuration-coordinate model, assuming the conformational substates are distributed thermally. This means that ZnMb is liquid-like in this temperature region. As a result, it is concluded that ZnMb undergoes a liquid-glass transition around 180 K.

引用

页码：81 / 86

页数：6