Scanning electron micrograph (SEM) of pollen grains from the common oak flower Quercus robur. Oak trees flower in May/June producing copious quantiies of pollen,which is dispersed by the wind. Oak pollen is a major cause of hay fever (medical term Allergic rhinitis and pollenosis). Sufferers produce an 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 hay fever attack. Mag: X1200 (10x8). | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Burgess, Dr. Jeremy |
Bildgröße: | 4784 px × 3696 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |