The use of "fossil" algal assemblages to reconstruct the historical pH levels in lakewaters has become the primary means of assessing the acidification rates of lakes over long time periods. Mallomonas acaroides is a valuable indicator species for pH that has been used in such inference models, however, there is some debate concerning the actual distribution of the species with respect to a pH ...

The extracellular pH of living tissue in the retina and elsewhere in the brain is lower than the pH of the surrounding milieu. We have shown that the pH gradient between the in vitro retina and the superfusion solution is regulated by a circadian (24-h) clock so that it is smaller in the subjective day than in the subjective night. We show here that the circadian changes in retinal pH result fr...