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Images Dated 20th July 2008

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Choose from 3,759 pictures in our Images Dated 20th July 2008 collection for your Wall Art or Photo Gift. Popular choices include Framed Photos, Canvas Prints, Posters and Jigsaw Puzzles. All professionally made for quick delivery.

Blood clot Featured 20 Jul 2008 Print

Blood clot

Blood clot. Coloured Scanning Electron Micrograph (SEM) of a blood clot, also known as a thrombus. Red blood cells (erythrocytes) are seen trapped in a web of white fibrin threads made of an insoluble protein. Small platelets (green) have also become enmeshed in the clot. When activated, platelets become spiky (as here), clump together and release chemical factors into the blood. These factors cause fibrin threads to form. A white blood cell of the immune system is also trapped (yellow). A clot forms when a blood vessel is injured or diseased. A clot that forms inside a blood vessel may lead to a heart attack if it blocks a heart artery. Magnification: x4, 200 at 6x7cm size. x2, 100 at 35mm size

© Cnri/Science Photo Library

Charles Darwin, caricature Featured 20 Jul 2008 Print

Charles Darwin, caricature

Charles Darwin. Caricature of the British naturalist Charles Darwin (1809-1882), proposer of the theory of evolution with natural selection as the driving force behind it. He is pictured dragging a long, hairy arm along the ground behind him, in the manner of an ape. When his theory was published, in On the Origin of Species By Means of Natural Selection (1859), it caused a storm of controversy as it flew in the face of the widely accepted belief that species were created as they now are by a divine creator (ie God). Although most scientists now accept evolution and natural selection based on overwhelming evidence, some controversy remains surrounding the issue

© Gary Brown/Science Photo Library

HaCaT culture cells, light micrograph Featured 20 Jul 2008 Print

HaCaT culture cells, light micrograph

HaCaT cells. Immunofluorescence light micrographof HaCaT daughter cells that have resulted fromone cell dividing into two (mitosis). The nuclei, which contain the cell's genetic information, arepurple. The green strands are microtubules, whichare involved in cell division. HaCaT cells arehuman skin cells (keratinocytes) that have beentransformed (mutated) to be immortal. They haveunlimited growth potential, but unlike otherimmortal cell lines they are not tumourigenic(tumour forming). This means they grow in anorderly fashion and retain all the structural andfunctional features of human skin. HaCaT cells aregrown in the laboratory and are used in research, including wound healing research. Magnification:x980 when printed 10cm wide

© Dr Torsten Wittmann/Science Photo Library