The differences between Gram-positive and Gram-negative bacteria are primarily due to their cell wall composition. Bacteria have cell walls made up of polysaccharides that give them strength and rigidity. This is important since bacteria often experience variations in osmotic strength from solutions of their environment, and their cell walls prevent them from shrinking or swelling. As a reminder, osmosis is the process by which solvent molecules pass through a semipermeable membrane from a less concentrated solution to a more concentrated one, equalizing the concentration on either side of the membrane. Nearly all bacterial cell walls have a peptide-polysaccharide layer called peptidoglycan, or sometimes murein. Peptidoglycan is a polymer made up of sugars and amino acids which forms a kind of mesh.
Bacteria can be classified based on their reaction to the Gram stain, which identifies them based on the chemical and physical properties of their cell walls, as gram positive or gram negative.
Gram-positive bacteria have cell walls composed of peptidoglycan or murein. These bacteria stain purple after Gram staining.
Gram-negative bacteria have cell walls containing peptidoglycan and an outer membrane with a lipopolysaccharide component not found in Gram-positive bacteria. Gram-negative bacteria stain red or pink after Gram staining.
gram
staining
bacteria
prokaryote
biology
simple
peptidoglycan
crystal violet
safranin
bacteria
gram positive
gram +ve
gram negative
gram -ve
microbiology
anatomy
physiology
medicine
nursing
bacterial taxonomy
bergeys manual
taxonomy
microbial taxonomy
gram positive VS gram negative bacteria
gram positive bacteria
gram negative bacteria
gram staining
microbiology lectures
microbiology lecture
gram positive vs gram negative
bacteriology lecture
Gram-positive bacteria are
Staphylococcus species
Streptococcus species
Clostridium species
Gram-negative example is
E.coli
Shigella
Salmonella
This is the third part of the bacteriology lectures
# microbiology
link for gram staining technique
[ Ссылка ]
Subscribe, like comment ,and share
