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55.5 MB (5.4 MB compressed)
3940 x 4925 pixels
33.3 x 41.7 cm ⏐ 13.1 x 16.4 in (300dpi)
A. DOWSETT, NATIONAL INFECTION SERVICE / SCIENCE PHOTO LIBRARY A. DOWSETT, NATIONAL INFECTION SERVICE / SCIENCE PHOTO LIBRARY
Helicobacter pylori. Transmission electron micro- graph (TEM) of a Helicobacter pylori bacterium (formerly called Campylobacter pyloridis). This Gram-negative bacillus bacterium is usually curved in shape or spiral, with flagellae for motility. Here, three hair-like flagellae are visible. The surface of the bacterial cell wall is seen in this shadow preparation technique. Colonies of H.pylori occur on the stomach mucous membrane in people suffering gastritis, and this bacteria may be linked to stomach ulcer formation. H.pylori may also be a co-factor for gastric cancer; its presence increases the risk of stomach tumours. Magnification: x68,000 at 9.5x12 inch size.
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