1.
J Bioenerg Biomembr
; 20(5): 585-602, 1988 Oct.
Article
in English
| MEDLINE
| ID: mdl-3215903
ABSTRACT
Measurements have been made of the modulated light-induced changes in conductivity and the associated relaxation times of bacteriorhodopsin in a variety of strong electrolytes, both unbuffered and buffered. The effects of pH and temperature variation have been studied as well as the effect of adding valinomycin. Two relaxation times can be distinguished: a fast lifetime associated with protonation-deprotonation, and a slow lifetime associated with ion binding. The ion-binding effects appear to be cation specific.
Subject(s)
Bacteriorhodopsins/radiation effects , Electric Conductivity , Halobacterium/radiation effects , Hydrogen-Ion Concentration , Kinetics , Light , Valinomycin/pharmacology
2.
Biophys Chem
; 24(2): 169-71, 1986 Jul.
Article
in English
| MEDLINE
| ID: mdl-17007799
ABSTRACT
A strong band at 412 nm has been observed in the photoacoustic spectrum of partially dried purple membrane, peaking sharply at a modulation frequency of about 70 Hz. This may be explained in terms of a disorder-order transition.