SEM of pollen grains, Poa annua

SEM of pollen grains, Poa annua

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Caption: False colour scanning electron micrograph (SEM) of pollen grains of annual meadow grass, Poa annua. This species flowers year round, producing copious quantities of pollen, which is dispersed by the wind. Meadow grass pollen is a major cause of hay fever (medical term Allergic rhinitis or pollenosis). Sufferers produce an antibody, immunoglobin E (IgE), which attaches to cells in the nose & eyes. It reacts with inhaled pollen causing 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: X430 at 35mm size. original is bw print b786/085

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Keywords: allergic rhinitis, botany, cause, grass, hay fever, hayfever, meadow, meadow grass, nature, plant, plants, poa annua, pollen, reproduction, reproductive, sem, type

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