Images Dated 29th September 2003

An autumn leaf drifts in a pond in one of the citys many parks in St. Petersburg

An autumn leaf drifts in a pond in one of the city's many parks in St. Petersburg, September 29, 2003. REUTERS/Alexander Demianchuk NO RIGHTS CLEARANCES OR PERMISSIONS ARE REQUIRED FOR THIS IMAGE PP05080019 AS/WS - RP5DRHYIKRAA

Little girl with balloons

© CSA-Printstock

533626061, Adolescence, Celebration, Child, Fun, Illustration, Playful, Pop Art

F. colour SEM of trabeculae in spongy bone tissue

Cancellous bone. False-colour scanning electron micrograph of trabeculae in cancellous (spongy) bone tissue. Bone tissue is divided into compact and cancellous. The latter fills the interior of bones and the cavities between the trabeculae are occupied by bone marrow. Trabeculae are thin and composed of irregular lamellae of bone with lacunae containing osteocytes. Some of these lacunae are visible as tiny dark depressions. Osteblasts are the cells responsible for bone formation. Once they cease activity and become embedded in bone matrix they are called osteocytes. Magnification: x36 at 6x7cm size. x60 at 4x5ins

© PROF. P. MOTTA/DEPT. OF ANATOMY/UNIVERSITY LA SAPIENZA , ROME/SCIENCE PHOTO LIBRARY