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Home > All Images > 1985 > July > 16 Jul 1985

Images Dated 16th July 1985

Choose from 12 pictures in our Images Dated 16th July 1985 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.


Pollen grains of Cocksfoot grass Featured 16 Jul 1985 Print

Pollen grains of Cocksfoot grass

False-colour scanning electron micrograph (SEM) of two pollen grains of cocksfoot grass, Dactylis glomerata. The pit on the right-hand grain is the germination pore, out which the pollen tube grows. Cocksfoot pollen is a wind- dispersed summer pollen & a major cause of hay fever (Allergic rhinitis or 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 symptoms of hay fever. Magnification: x370 at 35mm size. Gold tint. Original is bw print B786/073 Ref: MICROCOSMOS, fig. 4.32, p. 82

© DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY