False colour scanning electron micrograph (SEM) of pollen grains from the common oak flower Quercus robur. Oak trees flower in May/June producing copious quantities of pollen,which is dispersed by the wind. Oak pollen is a major cause of hay fever (medical term Allergic rhinitis & 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. Magnification: X 170 at 35mm size. original is bw print B786/90 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Burgess, Dr. Jeremy |
Bildgröße: | 5161 px × 3543 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |