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Home > All Images > 2004 > February > 20 Feb 2004

Images Dated 20th February 2004

Choose from 93 pictures in our Images Dated 20th February 2004 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.


Hummingbirds, historical artwork Featured 20 Feb 2004 Print

Hummingbirds, historical artwork

Hummingbirds. 19th Century illustration of five different species of male hummingbird. There are approximately 340 species of hummingbird (family Trochilidae). They get their name from the characteristic hum of their rapid wing flapping, which allows them to hover in mid-air. They feed on nectar and are particularly attracted to red flowers. Illustration from Gems of Nature and Art

© SHEILA TERRY/SCIENCE PHOTO LIBRARY

Hawkmoths, historical art Featured 20 Feb 2004 Print

Hawkmoths, historical art

Hummingbird hawkmoths (Macroglossa stellatarium), 19th century illustration. This moth is an expert hoverer and it darts from flower to flower with its long proboscis uncoiled. This gives it the illusion of a hummingbird (hence their name). The hummingbird hawkmoth is strongly attracted to flowers that provide a plentiful supply of nectar, such as red valerian. It has a very good memory and individuals return to the same flowerbeds every day at the same time

© SHEILA TERRY/SCIENCE PHOTO LIBRARY

Coloured SEM of the join between a tooth and crown Featured 20 Feb 2004 Print

Coloured SEM of the join between a tooth and crown

Dental crown. Coloured scanning electron microgr- aph (SEM) of the join between a tooth (green) and a dental crown (light blue). The tooth and ceramic crown are coated in debris (orange) which became attached to the tooth when it was extracted for this SEM. If the top of a tooth is badly cracked, decayed or broken, it must be replaced by an artificial crown. The remaining undamaged part of the tooth is cut down to a peg to receive the hollow crown. This crown is then shaped to form a replica of the original tooth and cemented in place. Here, the crack between the tooth and crown allows bacteria to enter and cause secondary tooth decay. Magnification: x50 at 6x7cm size

© VOLKER STEGER/SCIENCE PHOTO LIBRARY