Images Dated 29th June 2006

Limestone pavement above Malham Cove

MAB-197
Limestone pavement above Malham Cove
Yorkshire Dales, UK
Limestone pavement above Malham Cove has been deeply eroded by acid rain leaving clints (lumps of limestone) and grykes (the gaps in between). Grykes provide habitat for many rare or unusual plants such as hart's tongue ferns and enchanters nightshade. This 250 ft plus ancient outcrop of curved limestone cliffs in Yorkshire Dales, UK was once the location of a spectacular waterfall though today there is only a small beck or tarn flowing from the base. The area is species rich and managed as a National Nature Reserve.
Mark Boulton
Please note that prints are for personal display purposes only and may not be reproduced in any way

© Mark Boulton/ardea.com

Used dental floss, SEM

Used dental floss. Coloured scanning electron micrograph (SEM) of dental plaque on strands of used dental floss. Plaque consists of a film of bacteria embedded in a glycoprotein matrix. The matrix is formed from bacterial secretions and saliva. Plaque is the main cause of tooth decay. The bacteria feed on sugars in food, producing acid as a waste product. This acid corrodes the teeth's enamel coating, resulting in dental caries. A build-up of dental plaque can also lead to inflamed and infected gums. Severe gum disease can lead to teeth falling out. Magnification: x1050 when printed at 10 centimetres wide

© STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Programme for Royal Command Performance in honour of French President, 1939

BAL4735 Programme for Royal Command Performance in honour of French President, 1939 by Whistler, Rex (1905-44); Covent Garden Opera House Collection, London, UK; English, out of copyright

© Bridgeman Images

Covent Garden, Gala, Royal Opera