Images Dated 24th November 2004

Green turtle

Green turtle. Green turtle (Chelonia mydas) swimming beside a coral reef. This turtle uses its powerful paddle-like front limbs to propel itself through the water. Its name derives from the colour of its flesh. The green turtle is one of the largest turtles, growing up to 150 centimetres in length. Found in all warm tropical waters, C. mydas is almost completely aquatic. Only the female ever leaves the water: she does so to nest, returning to the beach where she was born to lay her eggs. Photographed off Palau Sipadan, Malaysia

© MATTHEW OLDFIELD/SCIENCE PHOTO LIBRARY

Physicists view a particle collision

MODEL RELEASED. Particle physics. Physicists view a computer display of a proton-antiproton collision from the D-Zero subatomic particle detector. This detector is at the Fermi National Accelerator Laboratory (Fermilab) near Chicago, USA. The white line entering the picture from bottom centre and top right represents the incoming proton and antiproton. They collide and annihilate at the centre to create a burst of new particles, represented by the light blue, pink and yellow lines and variously coloured dots. The green and dark blue circles represent the two ends of the cylindrical detector. The two physicists are Norman Graf (left) and Stuart Fuess

© DAVID PARKER/SCIENCE PHOTO LIBRARY

Coloured Gamma Scan of heart after heart attack

Heart after heart attack. Coloured Gamma Scan of a human heart (seen in transverse section) which has suffered myocardial infarction or heart attack. During a heart attack, heart muscle is starved of oxygen and necrosis (tissue death) occurs in places. Red/green areas show healthy active myocardial tissue which in a normal heart is continuous in a semi-circle around the left ventricle. Due to myocardial infarction the normal areas are separated, with scar tissue occurring in the dark blue region. Gamma scanning (scinti- graphy) involves introducing a radioactive tracer into the blood, which is taken up by the heart and detected by a gamma camera

© Cnri/Science Photo Library