Ragweed pollen

Numéro d’image : 11999075
Ragweed pollen
Ragweed pollen. Coloured Scanning Electron Micro- graph (SEM) of pollen grains on the stigma of a ragweed plant Ambrosia sp. The grains of pollen (yellow) have a spiked surface appearance. The multi-lobed stigma is green. Ambrosia is a daisy- like flower which grows in bare and waste ground. Its pollen is windborne and released in great quantities for cross-pollination. Ambrosia pollen acts as an allergen causing hay fever (pollenosis) in allergic individuals. Sufferers produce a sensitive antibody which is found on the surface of cells in the nose and eyes; the antibody reacts to the pollen and the nose,throat and eyes become inflamed. Magnification: x150 at 5x7cm size
Licence : Droits gérés
Crédit: Science Photo Library / Biophoto Associates
Taille de l’image : 4653 px × 3169 px
Model Release : Non requis
Property Release : Non requis
Restrictions :
  • ALL except GBR IRL CAN HKG ZAF USA IND TWN CHN DEU

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