Fig. 3. Plan views of steady state bioconvective patterns developed under various gravities and recorded with suspensions of T. pyriformis (A), T. thermophila (B) and TNR (C). These suspensions were placed in a 4 mm deep glass chamber at a density of 1x10⁶ cells ml^-1. Numbers indicate the magnitude of applied gravity in g. The mean wave numbers obtained by Fourier analysis from these pictures are shown by filled symbols in Fig. 4. Bar, 10 mm.