The staining bacteria is related to the structure and composition of the cell wall. In Gram-negative bacteria They contain proteins that the cell walls than gram-positive bacteria. It also has an outer cell wall thinner. In the dyeing process, when washed with alcohol to dissolve fat cells make the opening wider. Allow molecules of crystal violet - iodine complex come off, so stick to the red color of Zafra Nin (Safranin) in Gram-positive bacteria. The fat cells are less dazzling and overlapping elements of the cell walls less. When washing with alcohol makes cells shrink due to the loss of water. The cell membrane is smaller, smaller. The molecular compound of pigment does not melt out. The cells continue to purple. When stained with paint over Zafra new cell is not red.
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