1 23 Archives of Microbiology ISSN 0302-8933 Volume 196 Number 8 Arch Microbiol (2014) 196:589-600 DOI 10.1007/s00203-014-0994-y The effect of the rpoSam allele on gene expression and stress resistance in Escherichia coli Heloisa F. Galbiati, Natalia P. Taschner & Beny Spira