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Home > All Images > 1987 > August

August Gallery

Choose from 236 pictures in our August collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.


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

Emulsion photo of decay of kaon into pions Featured August Print

Emulsion photo of decay of kaon into pions

The first observation of the decay of a kaon into 3 pions, recorded in special photographic emulsion by Cecil Powell's team at Bristol University in 1948. The kaon produces the dense track coming in from top right. It decays at A into 3 pions. One of the pions moves away slowly, leaving a dense track, & then interacts at B. The other 2 pions are faster & leave relatively faint tracks as they move off in opposite directions towards top right & bottom left. (The distance between A & B is 25 micrometres). The kaon was the first discovered member of the family of "strange" particles, which contain a strange quark

© C. POWELL, P. FOWLER & D. PERKINS/SCIENCE PHOTO LIBRARY