Article Bacilli Biosynthesis Cell-wall thickness Gene Expression Gene expression Lactobacillus Lactobacillus acidophilus Lactobacillus casei Lipoteichoic acids Membrane Glycoproteins Osmosis Osmotic Pressure Osmotic stress Proteins RNA S-layer proteins Sodium Chloride Sodium chloride Stress condition adaptation bacterium cell wall controlled study drug effects envelope protein gene expression gene expression profiling genetic analysis genetic regulation