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.
Bacilli can single cell, arranged in chains to form streptobacillus or oval to form a coccobacillus. The third most common form that bacteria may appear in are spirals and these can be quite long when compared to the cocci or the bacilli. Spiral bacteria measure from 1.0 micrometers to over 100.0 micrometers in length.You may like to know that the spiral bacteria may be curbed or comma shaped which is when they are referred to as vibrio, they may be thick and rigid, these are called spirillum or they may be thin and flexible.tar-shaped bacteria, filamentous bacteria, lobed bacteria and bacteria sporting irregular shapes most commonly fall into a size range of approximately 1.0 micrometers in diameter yet unusual bacteria do exist with larger dimensions. Giant bacteria, giant when compared to the other bacteria.