False col SEM of pollen grains

False col SEM of pollen grains

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Credit: DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY

Caption: False-colour scanning electron micrograph (SEM) of pollen grains around a split-open (dehisced) anther of the common oak, Quercus robur. Oak trees flower in May/June & produce copious quantities of pollen, which is dispersed on the wind. Oak pollen is a major cause of hay fever (medical terms Allergic rhinitis & pollenosis). Sufferers produce an antibody, immunoglobin E (IgE), which attaches to cells in the nose & eyes. It reacts with inhaled pollen to cause the release of various chemicals, including histamine. Histamine causes the mucous membranes of the nose, eyes & throat to swell & become inflamed, bringing on the hay fever attack. Magnification: x20 at 35mm size. Original is bw print B786/086.

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Keywords: allergic rhinitis, anther, botany, cause, common oak, hay fever, hayfever, nature, oak, oak pollen, plant, plants, pollen, quercus robur, reproduction, reproductive, sem, type

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