Images Dated 10th December 2007

Salmonella bacterium dividing, SEM

Salmonella bacterium dividing. Coloured scanning electron micrograph (SEM) of of a Salmonella bacterium dividing. The two new daughter cells are seen at upper right and lower left, still joined by a thin connection (centre). Flagella, thin thread-like structures used by the bacteria to move, are also seen. Salmonella bacteria can cause food poisoning when they are eaten in contaminated food such as raw eggs. Given the right conditions, they can multiply rapidly. Symptoms include abdominal pain, nausea, diarrhoea and vomiting

© STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Thailand, Krabi, Railay. Longtail boats at Hat Phra Nang (Phra Nang Beach) with Happy Island in the background

© Andrew Watson/John Warburton-Lee Photography Ltd

Andaman Sea, Asia, Asian, Beach, Beaches, Blue Sky, Boats, Coast, Coast Line, Destination, Exotic, Hat Rai Leh, Icon, Iconic, Island, Islands, Jwl, Krabi Province, Landscape, Long Tail Boat, Longtail Boat, No Person, Outdoors, Railei, Rock Pinnacle, Scen Ic, Scenery, Sea, Sea Side, South East Asia, Southeast Asia, Thai, Thailand, Tropical, Tropics

Dissected heart, light micrograph

Dissected heart. Light micrograph of a section through a whole heart, showing the chambers and some blood. The heart is a hollow muscular organ that pumps blood around the body. The blood (red) arrives from the body, and is then pumped between the heart and the lungs, and back to the heart before being pumped around the body again. The heart has four chambers, the two most powerful being the lower chambers, the ventricles, which have the thick walls (purple) seen here. The smaller upper chambers, called atria (not clearly seen), pump blood from one side of the heart to the other. Inside the heart are structures called valves, which regulate blood flow between the chambers. Magnification: x33 when printed 10 centimetres tall

© STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY