FRANK FOX / SCIENCE PHOTO LIBRARY FRANK FOX / SCIENCE PHOTO LIBRARY
Light microscope footage of the freshwater algae Haematococcus pluvialis. This is a single-celled green alga, which photosynthesises using chlorophyll in good conditions. When stressed it produces the orange pigment astaxanthin, as seen here. Astaxanthin is an antioxidant and is thought to act as a sunscreen for the cells. The chemical is extracted and widely used in animal feeds, human dietary supplements and some cosmetics. H. pluvialis cells average around 20 micrometres in diameter, and are the richest natural source of astaxanthin. Despite this, the chemical can still be produced more cheaply from petroleum products.
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