Toxic Effects of Anthracene on Three Species of Marine Microalgae New Material of Desmidiales from China Impacts of nitrogen and phosphorus on inorganic carbon utilization and carbonic anhydrase activity in Nitzschia closterium f. minutissima Components of exopolysaccharides of Nitzschia closteriumand preparation of their sulfated products New Records of Desmids from Two River Source Natural Reserve of Altay Mountains,Xinjiang,China New Records of Desmids from Kanas National Nature Reserve,Xinjiang