Images Dated 13th September 2004

Artwork of vomiting reflex & causes of nausea

Vomiting. Illustrations of the mechanism (at centre) & causes (at left and right) of vomiting in the human body. An impulse from the brain stimulates the vomiting centre (green, at upper centre) in the brainstem. Nerve impulses sent to the stomach, diaphragm and abdominal wall (at lower centre) result in the stomach's contents being forcibly expelled. Vomiting can be triggered by stomach disorders (lower left) or disorders affecting the balancing mechanism of the inner ear (at left). Other causes include raised pressure in the skull (upper right) caused by head injury or brain tumour; and hormonal changes during pregnancy (at lower right)

© JOHN BAVOSI/SCIENCE PHOTO LIBRARY

Cut-away view of the Ariane 5 launcher

Ariane 5. Artwork showing a cut-away view of the European Ariane 5 launcher. Ariane 5 consists of a large first stage (lower 2/3rds of the central vehicle) flanked by two solid rocket boosters, with a smaller second stage (top 1/3rd). Most of the first stage is taken up by the vast liquid hydrogen and liquid oxygen tanks, which feed the single Vulcain motor (bottom left). The second stage is powered by a DASA engine powered by storable propellants (dinitrogen tetroxide and monomethyl hydrazine). The payload depicted here is the Cluster mission with its four identical spacecraft (blue/gold). The first Ariane 5 flight, carrying Cluster, is due for launch in mid-1996

© DAVID DUCROS/SCIENCE PHOTO LIBRARY

RAINFOREST - NEW CALEDONIA. Moss (Spindens vieillardii) covering trunks of Tree Fern (Cyathea novae-caledoniae)

JPF-12187
RAINFOREST - NEW CALEDONIA. Moss (Spindens vieillardii) covering trunks of Tree Fern (Cyathea novae-caledoniae)
Blue River Regional Park, New Caledonia
Cyathea novae-caledoniae
Moss (Spindens vieillardii) covering trunks of Tree Fern (Cyathea novae-caledoniae)
Jean Paul Ferrero
Please note that prints are for personal display purposes only and may not be reproduced in any way

© Jean-Paul Ferrero/ardea.com