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.
Corynebacterium diphtheriae are Gram-positive, nonmotile, rod-shaped bacteria that do not form spores or branch. They do not have a typical gram-postive cell wall. It consists of arabinose, galactose, disminopimelic acid, and short chain mycolic acids. In the mycolic acid, chains of 28-40 carbons are common.