Bubonic plague bacteria (yellow) on part of the digestive system in a rat flea (purple). Joseph Hinnebusch, Elizabeth Fischer and Austin Athman, National Institute of Allergy and Infectious Diseases, National Institutes of Health.
A cross-section of muscle tissue, surrounded by the extracellular tissue that acts as the connective tissue. Each muscle fiber is joined together by the connective tissue to make up the complete muscle.
BE_Myelinated nerves. A section through myelinated nerve fibers and Schwann cells. Myelin (green) is an insulating fatty layer that surrounds the nerve fibre (axon, black), increasing the speed at which nerve impulses travel.
A scanning electron microscopic image of HIV. The glycoprotein complex on its surface enables the virus to attach to and fuse with target cells to initiate the infectious cycle. How Nano Sized Colloidal Silver Kills Bacteria:)