25.0 MB (1.4 MB compressed)
3422 x 2557 pixels
29.0 x 21.6 cm ⏐ 11.4 x 8.5 in (300dpi)
ISM / SCIENCE PHOTO LIBRARY ISM / SCIENCE PHOTO LIBRARY
Asthma. Light micrograph of a sputum smear from an asthmatic patient showing a Curschmann spiral (purple filament). Curschmann spirals are twisted masses of mucus, formed in the lower airways when there is chronic airway obstruction. Magnification: x800 when printed 10 centimetres wide.
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