Gram-Positive vs Negative ·
Two Envelope Architectures
un
seel
.com · 1884 stain · purple vs pink
Gram+ PG
20–80 nm
Gram− PG
~7 nm
Stage
two cell walls
Crystal violet (initial stain)
Safranin (counterstain)
Peptidoglycan layer
LPS / outer membrane
Play
Pause
Unmute
Reset
Un
seel
.com · Gram-Positive vs Negative