Timothy Grass Pollen Grains
by Dr Jeremy Burgess/science Photo Library
Title
Timothy Grass Pollen Grains
Artist
Dr Jeremy Burgess/science Photo Library
Medium
Photograph - Photograph
Description
False colour scanning electron micrograph (SEM) of pollen grains of Timothy grass, Phelum pratense, also known as cat's-tail. A germinating pore is visible on some grains. A summer grass pollen dispersed by the wind, it is a major cause of hay fever (Allergic rhinitis & pollenosis). Sufferers produce a sensitising 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 familiar symptoms of hay fever. Magnification: X66 at 35mm size. Original is bw print B786/133.
Uploaded
September 16th, 2018
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