By H. D. Kumar, H. N. Singh (auth.)
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Extra resources for A Textbook on Algae
Alginates are extensively uscd as thickeners in the cosmetic, textile and pharmaceutieal industries, and as emulsifying agents in the preparation of poJishes and paints. AGAR-AGAR A jelly-Jike substance, agar-agar (often called simply agar), is a complex polysaccharide of great economic value. It is extracted in water from certain species of red algae belonging to Gelidium, Graci/aria and other genera whieh produce and store it along with cellulose in their cell walls. The most extensive use of agar is aS'a base for culture media for algae, fungi, bacteria and tissues.
A, Cylindrospermum, akinete and hcterocyst; B, Acelabularia, vertical section through fertile disc showing gametangial rays and cysts (after Bold, 1967); C, same showing germination of cyst; D, Wesliella, hormocysts and heterocysts. them to endure and survive unfavourable conditions without much structuraI modification. Perennation in other algae involves tbe formation of specially differen- 36 A TEXTBOOK ON ALGAE tiated resting cells. Some common examples are: 1. AkiDetes or "Spores". These are enlarged vegetative cells which become thick-walled and store abundant reserve food material (Fig.
Sewage oxidation ponds have been created for bringing aboutits complete oxidation into mineral components. , Chlorella, Chlamydomonas, Scenedesmus and Euglena. These help in the bacterial decomposition of sewage by providing oxygen; in addition, they recover the mineral nutrients from sewage which would otherwise have been lost in the efHuent. Sewage algae have also been used as animal feed, as man ure, and for ingestion by fish fingerlings in fish ponds. The main limitation preventing a wider exploitation of sewage algae is the lack of a cheap and effective harvesting technique.