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Images Dated 21st March 2003

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

Choose from 51 pictures in our Images Dated 21st March 2003 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.

Coloured X-ray of an impacted wisdom tooth Featured 21 Mar 2003 Print

Coloured X-ray of an impacted wisdom tooth

Impacted wisdom tooth. Coloured X-ray of teethin the lower left jaw of a patient, showing animpacted wisdom tooth. Normal molar teeth are seenat right (orange) with amalgam fillings in theircrowns (blue). At lower left is a wisdom toothgrowing horizontally, and which has impacted ontothe second molar lying beside it. Adults have fourwisdom teeth (also known as third molars) at theback of each row of teeth. They erupt between theages of 17 and 21. Impacted wisdom teeth maypenetrate the gum incorrectly, or may push otherteeth out of alignment. An impacted wisdom toothsuch as this one may have to be surgicallyremoved

© Alfred Pasieka/Science Photo Library

Lungs, CT scans Featured 21 Mar 2003 Print

Lungs, CT scans

Lungs. Sequence of six coloured axial CT (computed tomography) scans through the upper chest of a 52- year-old woman. The front of the chest is at top, and the right of the body is at left. The sequence moves down through the body as it runs from left- right along top then bottom. The two lungs (dark blue) and their branching airways (bronchioles, light blue) are separated by the mediastinal area (centre). This contains the trachea (blue circle) that splits into the two lung bronchi (images 4- 6). Major blood vessels (orange, upper centre) lead to the top of the heart (seen in images 4-6). The bone (dark orange) of the spine (lower centre) and ribs (surrounding the lungs) is also seen


DNA helices Featured 21 Mar 2003 Print

DNA helices

DNA helices. Models showing the double helix and nucleotide base structure of DNA (deoxyribonucleic acid) molecules. The double helix is formed by two spiralling strands of sugar phosphates. Nucleotide bases (red, blue, yellow, green) are arrayed along these strands. The four bases can form two bonding pairs: adenine bonds to thymine and cytosine bonds to guanine. This complementary base pairing holds the two strands together to form the DNA ladder'. DNA is found in cell nuclei, and the sequence of its nucleotide bases forms the genetic code for protein synthesis and the functioning and growth of every living organism

© Lawrence Lawry/Science Photo Library