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All ß-lactam antibiotics contain a core chemical structure called a ß-lactam ring (Figure 4) which determines the mode of action of this class of antibiotics.All phone wallpapers and background images are free on mob.org! These include penicillin and its derivatives, and the cephalosporins. Įxamples of cell wall synthesis inhibitors are the ß-lactam antibiotics. (a) Diagram showing the sequence of events that lead to lysis. Figure 3 Lysis of a bacterium with a defective cell wall. In the light micrograph in part (b), the intact near-spherical cell appears orange–yellow on the black background while the lysed cell has collapsed and lost most of its contents and so has a shrivelled shape and appears mostly black. Eventually the cell contents and surrounding membrane expand through the defective cell wall, the membrane then ruptures and the cell contents spill out that is, the cell lyses. As water enters by osmosis, the cell wall becomes defective. Initially the cell wall and the cell membrane beneath it are intact.
Part (a) is a schematic diagram showing the sequence of events that lead to the osmotic lysis of a bacterium.
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