30.0 MB (2.2 MB compressed)
3910 x 2686 pixels
33.0 x 22.9 cm ⏐ 13.0 x 9.0 in (300dpi)
POWER AND SYRED / SCIENCE PHOTO LIBRARY POWER AND SYRED / SCIENCE PHOTO LIBRARY
Household dust. Coloured Scanning Electron Micro- graph (SEM) of a sample of household dust. Dust contains an assortment of substances which can cause asthma or other allergic reactions. The allergens seen here include: long hairs such as cat fur, synthetic and woollen fibres, serrated insect scales, plant and insect remains. Asthma or hay fever are often a hypersensitive and irritant response to substances that, in most people, are harmless. Airborne allergens may come into contact with the respiratory airways, skin or surface of the eye. Magnification: x115 at 5x7cm size.
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