Ragweed pollen grains on stigma

Ragweed pollen grains on stigma

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Caption: False-colour scanning electron micrograph of pollen grains (pink) of the ragweed Ambrosia sp. on the stigma (blue) of the flower. This daisy- like flower, found growing in bare and waste ground, produces pollen allergens which are a cause of hay fever (pollenosis) in allergic individuals. Hay fever is the commonest of all allergies, occurring when certain pollens or mould spores are inhaled. Sufferer's produce a sensitising antibody which is found on the surface of cells in the nose & eyes; this antibody reacts to the pollen allergen by causing inflammation of the linings of nose & throat, & watering of eyes. Magnification: x590 at 35mm size.

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Keywords: allergy, ambrosia sp., botany, cause, cause of, flower, hay fever, hayfever, nature, plant, plants, pollen, pollinosis, ragweed, reproduction, reproductive, rhinitis, type

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