41.4 MB (5.1 MB compressed)
4618 x 3136 pixels
39.1 x 26.7 cm ⏐ 15.4 x 10.5 in (300dpi)
BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / 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 an allergic reaction. The allergens here include textile fibres, soot particles and pollen. An allergy is a hypersensitive response to certain substances that, in most people, are harmless. Allergens may come into contact with the skin, respiratory airways, or surface of the eye. The substances seen here may also be found airborne in different quantities. Some allergens, for example pollen grains, occur in house dust seasonally. Magnification: x205 at 6x9cm & x80 at 35mm size.
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