Death rates of wild-type and GlpK22 mutants plotted versus growth rates. Wild type is grown in glycerol minimal medium in batch cultures (black circle) and in 'chemostat' continuous cultures with growth rates coded in colors, see legend on the center right. GlpK22 mutants (white circle) are grown in glycerol minimal medium in batch culture. Data shown as mean ± (standard deviation) SD. Two replicates per condition. 