Ragweed pollen grains on stigma
Numéro d’image : 11999071
| 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 | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / Biophoto Associates |
| Taille de l’image : | 3624 px × 2480 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : |
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