Coloured scanning electron micrograph (SEM) of pollen grains from the flower of silver birch (Betula pendula). The outer wall of the grain (exine) has three pores. Silver birch pollen causes an allergic reaction in around a quarter of hay fever sufferers. Magnification: x3, 200 when printed at 15 centimetres wide. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / EYE OF SCIENCE |
Taille de l’image : | 6400 px × 5302 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : |
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