Blok M C, Hellingwerf K J, Kaptein R, de Kruijff B
Biochim Biophys Acta. 1978 Dec 4;514(1):178-84. doi: 10.1016/0005-2736(78)90088-3.
31P NMR has been used to measure light-induced pH changes inside bacteriorhodopsin vesicles containing entrapped sodium glucose-6-phosphate. Reversible light-induced pH changes were observed at various pH values. The results indicate that our vesicle preparations were not homogeneous with respect to the generation of pH gradients.