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Home > All Images > 2002 > December > 20 Dec 2002

Images Dated 20th December 2002

Available as Framed Photos, Photos, Wall Art and Gift Items

Choose from 11 pictures in our Images Dated 20th December 2002 collection for your Wall Art or Photo Gift. Popular choices include Framed Photos, Canvas Prints, Posters and Jigsaw Puzzles. All professionally made for quick delivery.


Blue-green alga, Spirulina platensis Featured 20 Dec 2002 Print

Blue-green alga, Spirulina platensis

False colour transmission electron micrograph of the blue-green algae, Spirulina platensis. Here, a single cell of this species is seen. Blue-green algae (cyanobacteria) are primitive algae. Their internal structure is closely related to bacteria. They are prokaryotic organisms which contain no membrane-bound nucleus; instead, as in bacteria, their nuclear material is dispersed throughout the cell. Photosynthetic lamellae (thread-like structures) are the primitive equivalent of chloroplasts. The red spots are food reserves known as cyanophycin granules. Some Spirulina species are eaten as a protein-rich health food. Magnification: x6660 at 6x4.5cm size

© A.B. DOWSETT/SCIENCE PHOTO LIBRARY