False-colour SEM of cocksfoot grass

False-colour SEM of cocksfoot grass

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Caption: False-colour scanning electron micrograph (SEM) of two pollen grains of cocksfoot grass, Dactylis glomerata, a major cause of hay fever (allergic rhinitis). The pit on the right-hand grain is the germination pore, out which the pollen tube grows. Cocksfoot pollen is a wind-dispersed summer pollen. Hay fever sufferers produce a sensitising 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 symptoms of hay fever. Magnification: x570 at 6x4.5cm size. Ref: MICROCOSMOS, fig. 4.32, p. 82 JBU colouring: blue & yellow. BW original is

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Keywords: allergic rhinitis, botany, cause, cocksfoot grass, cocksfoot pollen, dactylis glomerata, false-coloured, germinating pore, hay fever, hayfever, jbu colouring, nature, plant, plants, pollen, pollinosis, reproduction, reproductive

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