Gram-positive bacteria- cell wall, examples, diseases, antibiotics


Bacteria are microscopic organisms that can cause various infections and diseases in humans and animals. However, not all bacteria are the same. There are many different types of bacteria that have different characteristics, shapes, and structures. One way to classify bacteria is based on their reaction to a laboratory technique called Gram staining.

Gram staining is a method that uses four chemicals: crystal violet, iodine, alcohol, and safranin, to stain bacteria and differentiate them into two major groups: Gram-positive and Gram-negative. The name of this technique comes from the Danish bacteriologist Hans Christian Gram, who first developed it in 1884.

Gram staining works by exploiting the differences in the cell wall composition of bacteria. The cell wall is a protective layer that surrounds the bacterial cell membrane and gives shape and rigidity to the cell. The cell wall of bacteria is mainly composed of a substance called peptidoglycan, which is a polymer of sugars and amino acids. Peptidoglycan forms a mesh-like structure that can trap or exclude certain molecules.