If the peptidoglycan layer is thin, it's classified as gram negative. A gram-positive bacillus doesn't have an outer cell wall beyond the peptidoglycan membrane. This makes it more absorbent.

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.

The gastrointestinal tract holds a vast community of diverse microbes, and many of them play crucial roles in our health. | ...

Abstract and Introduction Empirical Antimicrobial Therapy Against Gram-negative Pathogens Adverse Consequences Related to Combination Antimicrobial Use Conclusion References A recent retrospective ...

A category of bacteria that produce a positive result with a violet dye staining technique, due to the presence of thick layer of peptidoglycan in their cell walls (bacteria that do not appear violet ...