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August Gallery

Choose from 16 pictures in our August collection for your Wall Art or Photo Gift. Popular choices include Framed Photos, Canvas Prints, Posters and Jigsaw Puzzles. All professionally made for quick delivery.


Coloured TEM of Yersinia pestis bacteria Featured August Print

Coloured TEM of Yersinia pestis bacteria

False colour transmission electron micrograph (SEM) of Yersinia pestis, a species of Gram negative, non- motile, capsulated, aerobic bacilli (oval/rod- shaped bacteria) that is the causative agent of bubonic plague (the Black Death of the Middle Ages) in humans. The bacteria are primarily flea- carried pathogens of rats. Transfer to man occurs when a flea is obliged to leave its dead rodent host (often because its feeding apparatus is blocked by multiplying bacteria and it is starving) and suck human blood. Infection is rapid, featuring swelling (bubo) of lymph nodes and leading to septicaemia and pulmonary infection. Magnification: X 10, 500 at 35mm size

© CNRI/SCIENCE PHOTO LIBRARY

cosmic ray atomic nuclei Featured August Print

cosmic ray atomic nuclei

Emulsion photograph showing the tracks of various cosmic ray nuclei, ranging from a hydrogen nucleus to an iron nucleus. The more protons a nucleus contains, the higher its positive electric charge & the greater its ability to ionise; the more it ionises, the denser its track in emulsion. Hydrog- en has 1 proton & produces a barely visible track. Ionisation depends on the square of the charge; so lithium's 3 protons have 9 times hydrogen's charge & produce a track 9 times denser. Iron, with 26 protons, produces a track 676 times denser than hydrogen. The wispy strands that adorn the denser tracks are "delta rays" - electrons knocked out of atoms in the emulsion by the passing nucleus

© POWELL FOWLER PERKINS/SCIENCE PHOTO LIBRARY