Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Membrane composition of gram‐positive and gram‐negative bacteria. A, Difference between membrane layers of gram‐positive and gram‐negative bacteria and the presence of lipopolysaccharide (LPS) on the outer membrane of the gram‐negative species. B, General chemical structure of lipopolysaccharide molecule composed of four chemically distinct moieties. Courtesy of Dr Alexander Strachan, University of Plymouth, UK
