FIGURE 9.

Summary of cytoplasmic pH regulation in response to the pH in the surrounding media for members of phylum Chlorophyta and Cyanobacteria reported in the literature (seven and four members, respectively). Chlorophyta includes Chlorella kessleri (El-Ansari and Colman, 2015), Chlorella pyrenoidosa and Scenedesmus quadricauda (Lane and Burris, 1981), Chlorella saccharophila (Gehl and Colman, 1985), Chlorella vulgaris and Chlorella fusca (Küsel et al., 1990) and Dunaliella parva (Gimmler et al., 1988). Cyanobacteria include Agmenellum quadruplicatum and Gloeobacter violaceus (Belkin et al., 1987), Anacystis nidulans, (Falkner and Horner, 1976) and Synechococcus sp. (Kallas and Castenholz, 1982). Note that only one Cyanobacterium (A. quadruplicatrum) did grow at a pH below 6.0. All other data points are expressed as mean values with error bars representing 1 standard deviation.