False-colour scannning electron micrograph of a T-lymphocyte killer cell (small cell at left), attacking a large cancer tumour cell. The T- lymphocyte, a white blood cell, must make intimate contact with the tumour cell. It does so by recognizing antigens on the tumour’s surface.
A freeze fracture scanning electron micrograph of a single cell. The cell nucleus is orange. The small black holes are nuclear pores. The cell membranes are purple, the endoplasmic reticulum is pink, and the golgi apparatus is green. Image credit; Lennart Nilsson
Trypanosoma, a parasitic flagellated protozoan that causes trypanosomiasis (African sleeping sickness and Chagas disease). This trypanosome is a vector borne parasite transmitted by Tsetse Flies (Glossina). The ribbon like flagellated trypomastigote is carried in the insect's saliva and enters the human host through a wound made by the fly. This protozoan infects the blood, lymph, and spinal fluid and rapidly divides. Upon entering the cerebral spinal fluid the parasite can damage brain..
Bone tissue. Colored SEM of a section through an osteoclast in bone matrix, showing the cell's nucleus (round, center). Osteoclasts remodel bone by degrading and reabsorbing it in response to growth or changing mechanical stress. A border of complex branching microprojections (thread-like) can be seen anchoring the cell to the bone matrix.