Fig. 5From: The effect of diurnal light cycles on biohydrogen production in a thermosiphon photobioreactorScanning transmission electron microscopy (STEM) images of R. palustris cells a before (at 0 h, after preculturing in Van Niels medium); and b after (at 456 h) being exposed to a diurnal illumination cycle—images taken by Stellenbosch University’s Central Analytical Facilities (CAF)Back to article page