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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

Specimen: Rotifers around a single-cell green alga (desmid Staurastrum sexangulare). by Dr. Igor Siwanowicz

Specimen: Rotifers around a single-cell green alga (desmid Staurastrum sexangulare). by Dr. Igor Siwanowicz

Dictyocha speculum Ehrenberg, 1839 . http://media.nordicmicroalgae.org/large/Dictyocha%20speculum_3.jpg

Dictyocha speculum Ehrenberg, 1839 . http://media.nordicmicroalgae.org/large/Dictyocha%20speculum_3.jpg

Axones nerviosos - A cross section of a bundle of nerve fibers.  Axons (orange) are wrapped in myelin (purple); an extension of the membrane of glial cells.  Myelin has high lipid content, and acts to insulate the axons, causing them to transmit nerve impulses much faster.

Axones nerviosos - A cross section of a bundle of nerve fibers. Axons (orange) are wrapped in myelin (purple); an extension of the membrane of glial cells. Myelin has high lipid content, and acts to insulate the axons, causing them to transmit nerve impulses much faster.

Photos of the Amazing and Gruesome World Under a Microscope: The green chloropasts in plant cells

Photos of the Amazing and Gruesome World Under a Microscope

Photos of the Amazing and Gruesome World Under a Microscope: The green chloropasts in plant cells

A scanning electron microscope picture of a nerve ending. It has been broken open to reveal vesicles (orange and blue) containing chemicals used to pass messages in the nervous system.

A scanning electron microscope picture of a nerve ending. It has been broken open to reveal vesicles (orange and blue) containing chemicals used to pass messages in the nervous system.

Grains of sand magnified by 250 times.

Grains of sand magnified by 250 times.

Human Tooth    This is an image of a piece of dentine acquired using a scanning electron microscope.

Human Tooth This is an image of a piece of dentine acquired using a scanning electron microscope.

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