Larger Image Figure 3. Effect of the extracellular pH on UmSRT1-mediated sucrose transport in yeast.Uptake was measured in sodium-phosphate buffer pH 5.5 in the presence of the indicated compounds that were added from unbuffered solutions. Both unbuffered GSSG (10 mM) and unbuffered GSH (10 mM) reduced the pH-values of 3.3 (n = 3±SE). Image published in: Wippel K et al. (2010) Wippel et al. Creative Commons Attribution license Permanent Image Page Printer Friendly View XB-IMG-125218