Images Dated 25th February 2004

Particle tracks

Subatomic particle tracks. Coloured bubble chamber photograph showing tracks left by subatomic particles from a particle accelerator at CERN, the European particle physics laboratory at Geneva. A bubble chamber is a container filled with liquid hydrogen which is superheated - momentarily raised above its normal boiling point by a sudden drop in pressure in the container. Any charged particle passing through the liquid in this state leaves behind a trail of tiny bubbles as the liquid boils in its wake. The bubbles are seen as fine tracks, which show the characteristic paths of different types of particle and which are curved due to an intense applied magnetic field

© PATRICE LOIEZ, CERN/SCIENCE PHOTO LIBRARY

Europe, Netherlands, Amsterdam Koninklijk Palace (Royal Palace), originally built

Europe, Netherlands, Amsterdam Koninklijk Palace (Royal Palace), originally built as the city hall

© Dave Bartruff / Danita Delimont, Agent

Amsterdam, Architectural Ornament, Architecture, City Hall, Clock, Clock Tower, Danita Delimont, Dave Bartruff, Décor, Europe, Facade, Holland, Koninklijk, Koninklijk Palace, Landmark, Netherlands, Palace, Relief, Royal, Tour, Tourist Attraction, Tower

Light micrograph of liver fluke, Fasciola hepatica

Liver fluke. Light micrograph of a liver fluke, Fasciola hepatica, a parasite of sheep, cattle & humans. The dark branched structures are the alimentary tract of the fluke. Humans ingest the fluke larvae by eating infested vegetation. Immature flukes migrate through the duodenum & into the bile ducts via the liver, where they ingest blood & tissue debris, mature, & lay eggs. These pass into the faeces which may contaminate lakes and streams. The eggs hatch to release larvae which infect certain snails. A free- swimming form released from the snails becomes encysted on aquatic vegetation, forming the next infective stage. Magnification: x1.5 at 35mm size

© SINCLAIR STAMMERS/SCIENCE PHOTO LIBRARY