Submerged fermentation conditions for synthesis of extracellular polysaccharide by Inonotus obliquus Effect of Brachionus urceus culture media filtrate on the morphology and polysaccharides content in Scenedesmus obliquus Component Analysis of the Extracellular Polysaccharide from Mortierella hepiali Chen et Lu sp. nov. Mechanism of desiccation tolerance in the terrestrial Nostoc : a review