Effects of medium osmolarity on V. fischeri growth and luminescence. V. fischeri strain ES114 was grown in SWT medium mixed with Instant Ocean to achieve different final osmolarities. Growth, measured as the OD595, is plotted versus time (A), and relative luminescence per OD595 is plotted versus the OD595 (B) for cultures grown in SWT at 570 mosM (circles), 810 mosM (squares), 1,050 mosM (triangles), or 1,300 mosM (diamonds).