Osmotic regulation of transport processes in Lactobacillus plantarum

A simplified view of a microorganism (or one cell organism) is that of a compartment containing a variety of small solutes and biological macromolecules (proteins and nucleic acids) that is encompassed with a membrane. This membrane is permeable to water, but it forms an effective barrier for most other solutes. Outside this membrane, the cell usually has a rigid wall that is readily permeable to small molecules and offers mechanical stability to the cell. Under normal growth conditions, the concentration of solutes inside the cell (in the cytoplasm) are higher than those in the environment. In other words, the cytoplasm has a higher osmolality, i.e., the amount of 'osmotically active' solutes in a solution, than the outside medium.

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