Definition of retain. transitive verb. 1a : to keep in possession or useb : to keep in one's pay or service; specifically : to employ by paying a retainerc : to keep in mind or memory : remember.
However, some gram- positive bacteria may also have capsules. Examples for gram-negative bacteria with capsules: Escherichia â¦coli, Klebsiella pneumoniae, Salmonella. Examples for gram-positive bacteria with capsules : Bacillus megaterium, Streptococcus pyogenes, Sterptococcus pneumoniae.
embeds the cells and are equivalent to biofilms. A type of capsule found in bacteria called a glycocalyx. Glycocalyx is a thin layer of tangled polysaccharide fibers which is a observed on the surface of cells growing in nature. Some consider all the different types of exopolysaccharides to be glycocalyx.