Images Dated 3rd September 2004

LM of radiolaria, a type of marine protozoa

Radiolaria. Light micrograph of radiolaria, a type of marine protozoa. Radiolaria build hard skeletons (tests) made of silica around themselves as they float in seas with other plankton. They extend their protoplasm as pseudopodia (false feet) through pores in their test to feed on tiny organisms. Radiolaria can change their density in order to vary their depth. Large numbers of radiolarian skeletons litter the sea bed, becoming fossilised to form minerals like flint. Phase contrast. Magnification unknown

© Alfred Pasieka/Science Photo Library

Red blood cells embedded in tissue

Red blood cells. Coloured scanning electron micrograph of red blood cells in tissue. Blood is composed mainly of red blood cells (erythrocytes). Red blood cells are pumped to all parts of the body. They contain haemoglobin which bonds with oxygen in a reversible reaction in the lungs, and then releases that oxygen to cells in tissues. They then remove carbon dioxide from the cells and return it to the lungs. Tissues are collections of similar cells acting together to perform specific functions in the body (eg. muscles). Magnification: x1100 when printed 10 cm wide

© STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Little Corella - scratching head

DH-3320
Little Corella - scratching head
Kimberleys, Western Australia
Cacatua sanguinea sanguinea
Found throughout most of Australia in dry woodland, mulga and mallee. Also around inland farm bores and tree-lined watercourses.
Don Hadden
Please note that prints are for personal display purposes only and may not be reproduced in any way

© Don Hadden/ardea.com