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Nerve bundle. Coloured scanning electron micrograph (SEM) of a freeze-fractured section through a bundle of myelinated nerve fibres. Myelin sheaths (yellow) can be seen surrounding the axons (blue). Perineurium (connective tissue, pink) surrounds the nerve bundle while endoneurium divides the individual fibres.

Nerve bundle. Coloured scanning electron micrograph (SEM) of a freeze-fractured section through a bundle of myelinated nerve fibres. Myelin sheaths (yellow) can be seen surrounding the axons (blue). Perineurium (connective tissue, pink) surrounds the nerve bundle while endoneurium divides the individual fibres.

Blood clot. Coloured scanning electron micrograph (SEM) of a blood clot from the inner wall of the left ventricle of a human heart. Red blood cells (erythrocytes) are trapped within a fibrin protein mesh (cream). The fibrin mesh is formed in response to chemicals secreted by platelets (pink), fragments of white blood cells. Clots are formed in response to cardiovascular disease or injuries to blood vessels. Connective tissue (orange) is also seen.

Blood clot. Coloured scanning electron micrograph (SEM) of a blood clot from the inner wall of the left ventricle of a human heart. Red blood cells (erythrocytes) are trapped within a fibrin protein mesh (cream). The fibrin mesh is formed in response to chemicals secreted by platelets (pink), fragments of white blood cells. Clots are formed in response to cardiovascular disease or injuries to blood vessels. Connective tissue (orange) is also seen.

Colored scanning electron micrograph (SEM) of squamous cell carcinoma (cancer) cells from a human mouth. The many blebs (lumps) and microvilli (small projections) on the cells' surfaces are typical of cancer cells.

Colored scanning electron micrograph (SEM) of squamous cell carcinoma (cancer) cells from a human mouth. The many blebs (lumps) and microvilli (small projections) on the cells' surfaces are typical of cancer cells.

Colored scanning electron micrograph of the blood vessels coming from the optic disc. Way cool.

Colored scanning electron micrograph of the blood vessels coming from the optic disc. Way cool.

Using a Scanning Electron Microscope, retired scientific photographer Steve Gschmeissner, 61, from Bedford, is able to magnify insects by up to a million times. The results show incredibly detailed images of creepy crawlies in 3D  A coloured scanning electron micrograph of the head of a human flea (Pulex irritans)

Using a Scanning Electron Microscope, retired scientific photographer Steve Gschmeissner, 61, from Bedford, is able to magnify insects by up to a million times. The results show incredibly detailed images of creepy crawlies in 3D A coloured scanning electron micrograph of the head of a human flea (Pulex irritans)

Scanning electron micrograph (SEM) of human fibroblasts growing on microcarrier beads.    DAVID M. PHILLIPS/SCIENCE PHOTO LIBRARY

Scanning electron micrograph (SEM) of human fibroblasts growing on microcarrier beads. DAVID M. PHILLIPS/SCIENCE PHOTO LIBRARY

Lung cancer cell division.  Coloured scanning electron micrograph (SEM) of a lung cancer cell during cell division (cytokinesis). The two daughter cells remain temporarily joined by a cytoplasmic bridge (centre). Cancer cells divide rapidly in a chaotic, uncontrolled manner. They may clump to form tumours, which invade and destroy surrounding tissues.

Lung cancer cell division. Coloured scanning electron micrograph (SEM) of a lung cancer cell during cell division (cytokinesis). The two daughter cells remain temporarily joined by a cytoplasmic bridge (centre). Cancer cells divide rapidly in a chaotic, uncontrolled manner. They may clump to form tumours, which invade and destroy surrounding tissues.

Macrophage engulfing TB bacteria. Coloured scanning electron micrograph (SEM) of a macrophage white blood cell (purple) engulfing a tuberculosis (Mycobacterium tuberculosis) bacterium (pink).

Macrophage engulfing TB bacteria. Coloured scanning electron micrograph (SEM) of a macrophage white blood cell (purple) engulfing a tuberculosis (Mycobacterium tuberculosis) bacterium (pink).

Inner ear hair cells. Coloured scanning electron micrograph (SEM) of sensory hair cells from the inner ear. These cells are surrounded by a fluid called endolymph. As sound enters the ear it causes waves to form in the endolymph, which in turn cause the hairs to move. The movement is converted to an electrical signal that is passed on to the brain. Each crescent-shaped arrangement of hairs lies atop a single cell.

Inner ear hair cells. Coloured scanning electron micrograph (SEM) of sensory hair cells from the inner ear. These cells are surrounded by a fluid called endolymph. As sound enters the ear it causes waves to form in the endolymph, which in turn cause the hairs to move. The movement is converted to an electrical signal that is passed on to the brain. Each crescent-shaped arrangement of hairs lies atop a single cell.

Bone marrow, coloured scanning electron micrograph (SEM). This freeze-fracture has revealed the cavity (lumen) of a large venous sinus (pink), which contains mature blood cells (red), and developing white blood cells (blue). Either side of the sinus are the haemopoetic foci of the marrow (green). Magnification: x3000 when printed at 10 centimetres across | Steve Gschmeissner

Bone marrow, coloured scanning electron micrograph (SEM). This freeze-fracture has revealed the cavity (lumen) of a large venous sinus (pink), which contains mature blood cells (red), and developing white blood cells (blue). Either side of the sinus are the haemopoetic foci of the marrow (green). Magnification: x3000 when printed at 10 centimetres across | Steve Gschmeissner

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