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A World in One Cubic Foot is a series of photographs by David Liittschwager, a National Geographic photographer. He set out to document the worlds biodiversity using a steel frame of one cubic foot. “A cubic foot fits in your lap; you can put your arms around it. If you stand with both feet together and look down, it’s just about the size of your footprint while standing still,” he says.
The DNA Replication Complex, an assembly of proteins that synthesizes new DNA before cell division. It consists of Helicase, Primase, Single-strand binding proteins, and DNA polymerase III. Because DNA strands can only be copied in one direction, the complex must pull out loops of one strand and replicate it in fragments. At this moment there are hundreds of trillions of these molecular machines in constant activity within your body.
Video Credit: Drew Barry
A small molecule known to regulate white blood cells has a surprising second role in protecting brain cells from the deleterious effects of stroke, Johns Hopkins researchers report. The molecule, microRNA-223, affects how cells respond to the temporary loss of blood supply brought on by stroke —…
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