Gram-Positive vs Gram-Negative Bacteria- 31 Differences with Examples

Differences Between Gram Positive and Gram Negative Bacteria

  Gram Positive vs Gram Negative Bacteria (31 Major Differences) S.N. Character Gram-Positive Bacteria Gram-Negative Bacteria 1. Gram Reaction Retain crystal violet dye and stain blue or purple on Gram’s staining. Accept safranin after decolorization and stain pink or red on Gram’s staining. 2. Cell wall thickness Thick (20-80 nm) Thin (8-10 nm) 3. Peptidoglycan Layer Thick (multilayered) Thin (single-layered) 4. Rigidity and Elasticity Rigid and less elastic Less rigid and more elastic 5. Outer Membrane Absent Present 6. Variety … Read more

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

Gram-negative bacteria

What are Gram-negative bacteria? These are bacteria that define the opposite of the gram-positive bacteria in relation to the differential staining technique.  During gram staining, the gram-negative bacteria will lose the crystal violet dye color after a wash with alcohol and take up the pink/red color of the counterstain, safranin. The two classes of bacteria are differentiated through gram staining, because of their cell wall composition i.e Gram-positive bacteria have a large layer of peptidoglycan and a thin layer of … Read more