 Most RpoS expression is determined at the translational level.sRNAs (small noncoding RNAs) sense environmental changes and in turn increase "rpoS" mRNA translation to allow the cell to accordingly adjust to external stress.The promoter of the 85 nucleotide sRNA DsrA contains a temperature-sensitive transcription initiation thermocontrol as it is repressed at high (42˚C) temperatures, but induces (perhaps by complementary binding to) "rpoS" at low (25˚C) temperatures.