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.
Bacteria comes in three general shapes: spherical, rod-shaped and spiral. This article will focus on the spherical (sometimes oval) shaped bacteria. If you are talking about a single bacterium, the term is coccus, and the plural form is cocci.A coccus organism is capable of living on its own, but it may also live in a formation along with other cocci bacteria. Two joined cocci are known a diplococci, while four arranged in a square shape are called a tetrad.The Sarcina genus arrange themselves in groups of eight, in a cube shape.ome notable cocci bacteria include: Staphylococcus aureus: These bacteria are often found in the nose and on the skin, and about 20% of humans are carriers. It is capable of causing various minor skin conditions, and it can cause more serious infections, like pneumonia, meningitis, and toxic shock syndrome (TSS).