First, gram-negative bacteria have a thin cell wall that is about 1.5 to 10 nanometers across, whereas gram-positive bacteria have a thick cell wall measuring about 20 to 80 nanometers.

A gram-positive bacillus doesn't have an outer cell wall beyond the peptidoglycan membrane. This makes it more absorbent. Its peptidoglycan layer is much thicker than the peptidoglycan layer on ...

That royal shade, or lack of it, reveals a cell’s type of outer structure. Published by Hans Christian Gram in 1884, gram staining distinguishes gram-positive bacteria (purple) from gram ...