Agri Kultuur August 2014 | Page 39

industry and did you know that in many tropical communities, coralline rock is used as building stones. The commercial use of seaweeds in South Africa comprises but a small industry utilizing mostly brown and fleshy red seaweeds. The increasing use of local representatives of seaweeds has resulted in a state policy to ensure the sustainable use of these commercial resources and this awareness has greatly facilitated research on local seaweeds and considerably increased our knowledge of most of the species. It is only with this increased awareness that we’ve been able to bring to you the knowledge that we’ve gained regarding this fascinating group of marine organisms. Gigartina polycarpa (tongue weed) is an example of a carrageenophyte. GLOSSARY Antioxidant: A compound (vitamins A [which is converted from beta-carotene], C and E selenium [a mineral], and carotenoids) that protects against cell damage caused by molecules called oxygenfree radicals (oxidation) that are a major cause of disease and aging. Cretinism: A type of mental and physical retardation caused by severe, uncorrected thyroid deficiency in infancy and early childhood. Goiter: An enlargement of the thyroid gland quite often due to a lack of iodine in the diet. Primary Production: The production of organic matter (plant tissue) from carbon dioxide, water and sunlight through photosynthesis. Original Reference: Maneveldt, G.W. 2006. You use seaweeds for that? Veld & Flora 92(1): 24-25.