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Home > All Images > 1989 > September > 19 Sep 1989

Images Dated 19th September 1989

Choose from 9 pictures in our Images Dated 19th September 1989 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.

False-colour SEM of cocksfoot grass Featured 19 Sep 1989 Image

False-colour SEM of cocksfoot grass

False-colour scanning electron micrograph (SEM) of two pollen grains of cocksfoot grass, Dactylis glomerata, a major cause of hay fever (allergic rhinitis). 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. Hay fever 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: x570 at 6x4.5cm size. Ref: MICROCOSMOS, fig. 4.32, p. 82 JBU colouring: blue & yellow. BW original is