Gram-
(stains pink) LPS – lipopolysacharrideSHigellasAlmonellapseudomonase.coli
Gram- is a prefix that is often used in science and medicine. It is derived from the name of Danish bacteriologist Hans Christian Gram, who developed the Gram stain, a laboratory technique used to classify bacteria.
Some common examples of words that use the prefix gram- are:
1. Gram-positive: This term is used to describe bacteria that retain the crystal violet stain used in the Gram stain. These bacteria have a thick cell wall made of peptidoglycan, which traps the stain.
2. Gram-negative: This term is used to describe bacteria that do not retain the crystal violet stain in the Gram stain. These bacteria have a thinner cell wall made of less peptidoglycan and an outer membrane that prevents the stain from sticking.
3. Gram stain: This is a laboratory technique used to differentiate bacteria based on their cell wall structure. The bacteria are first stained with crystal violet, then rinsed with a decolorizing solution, and finally counterstained with safranin.
4. Gram unit: This is a unit of mass used in the metric system, equal to one thousandth of a kilogram. It is often used to express the mass of small objects, such as bacteria or molecules.
Overall, the prefix gram- is an important term in science and medicine, often used to describe bacteria and their properties.
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