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Home > All Images > 2003 > March > 31 Mar 2003

Images Dated 31st March 2003

Available as Framed Prints, Photos, Wall Art and Gift Items

Choose from 28 pictures in our Images Dated 31st March 2003 collection for your Wall Art or Photo Gift. Popular choices include Framed Prints, Canvas Prints, Posters and Jigsaw Puzzles. All professionally made for quick delivery.


The Milky Way and some of its famous members Featured 31 Mar 2003 Print

The Milky Way and some of its famous members

Artwork of our galaxy, the Milky Way. The position within the galaxy of some well known objects is also shown: supernova remnants with their peculiar objects (black holes and neutron stars) SS433, M1, Tycho, Vela and G109.1-1.0; starbirth regions W3 and Orion; a young powerful star, Eta Carinae, and the Pleiades, a cluster of newly-born stars. The Milky Way contains at least 100 billion stars and may be divided into three regions: the central bulge (white-yellow at centre), the disc with the spiral arms and the galactic halo (not shown). The central bulge is populated by old stars whereas the disc contains young stars and a higher density of open star clusters and interstellar gas

© JULIAN BAUM/SCIENCE PHOTO LIBRARY

Molecular graphic of LAC repressor binding to DNA Featured 31 Mar 2003 Print

Molecular graphic of LAC repressor binding to DNA

LAC repressor binding to DNA. Computer graphic of a lac repressor molecule (pink) interacting with genes on DNA that control lactose metabolism in Escherichia coli bacteria. The lac (lactose) repressor molecule is a protein made of four units and two arms. Lac arms are seen binding to two of three gene sites on a spiral DNA (Deoxyribonucleic acid) molecule. The bound DNA forms a repression loop, trapping and silencing a blue CAP activator protein. Switching off these genes occurs when lactose levels in E.coli are low. The genes code for an enzyme which metabolizes lactose. This gene regulation may help the design of gene therapies

© MITCHELL LEWIS, UNIVERSITY OF PENNSYLVANIA MEDICAL CENTER/SCIENCE PHOTO LIBRARY