What is the difference between Gram-positive and Gram-negative bacteria? Gram-positive bacteria show blue or purple after gram-staining in a laboratory test. They have thick cell walls. Gram-negative bacteria show pink or red on staining and have thin walls.
Gram-negative bacteria are surrounded by a thin peptidoglycan cell wall, which itself is surrounded by an outer membrane containing lipopolysaccharide. Gram-positive bacteria lack an outer membrane but are surrounded by layers of peptidoglycan many times thicker than is found in the Gram-negatives.
Gram positive bacteria are surrounded by a single thick peptidoglycan cell wall and are therefore termed monoderms. Gram negative bacteria have a much thinner peptidoglycan cell wall, but in addition they have an outer membrane containing lipopolysaccharides surrounding the cell and are consequently termed diderms.
Examining the Gram stain
Color: Typically, bacteria that are gram-positive appear purple to blue, and bacteria that are Gram-negative appear pink to red. Shape: The most common shapes include round (cocci) or rod-shaped (bacilli).
Gram-positive bacteria are species of bacteria that have a thick peptidoglycan outer layer that absorbs antibiotics easily, making them easier to kill. Gram-negative bacteria, on the other hand, have a thin peptidoglycan layer that is covered by multiple thin layers of membrane that can better-resist antibiotics.
The organisms are identified based on color and shape. Gram-positive organisms are either purple or blue in color, while gram-negative organisms are either pink or red in color. Bacilli are rod-shaped, while cocci are spherical.
A mixture of hydrogen peroxide and ascorbic acid has been found to generate an antibacterial mechanism which is active against gram-negative bacteria. It results in bacterial death and renders the organism sensitive to lysis by lysozyme.
The majority of the WHO list is Gram-negative bacterial pathogens. Due to their distinctive structure, Gram-negative bacteria are more resistant than Gram-positive bacteria, and cause significant morbidity and mortality worldwide.
In simple positive staining, basic dyes such as methylene blue or crystal violet are used. The basic dye gets attracted to the negatively charged genetic material of the microbial cytoplasm. Alternatively, in simple negative staining, acidic dyes such as nigrosin or congo red are used.
Gram-negative bacteria produce endotoxins, which are lipopolysaccharides (LPS) found in their outer cell membrane. These endotoxins can trigger a severe immune response in the host, leading to the release of pro-inflammatory cytokines, vascular leakage, and tissue damage.
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