Coloured scanning electron micrograph (SEM) of pollen grains clustered to the stigma of the cocksfoot grass (Dactylis glomerata). Cocksfoot pollen,a summer wind-dispersed pollen,is a major cause of hay fever (Allergic rhinitis & pollenosis). Hay fever sufferers produce a sensitising antibody,immunoglobin E (IgE),which attaches to the surface of cells in the nose & eyes. It reacts with inhaled pollen (an allergen) 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 symptoms of hay fever. Magnification: x70 at 35mm size. original is bw print B786/070 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Burgess, Dr. Jeremy |
Taille de l’image : | 2680 px × 3731 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |