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.
Define bacterial capsule. bacterial capsule synonyms, bacterial capsule pronunciation, bacterial capsule translation, English dictionary definition of bacterial capsule. n. 1. A small soluble container, usually made of gelatin, that encloses a dose of an oral medicine or a vitamin. 2. Anatomy A fibrous, membranous, or fatty...