Studies on antioxidative activity of high molecular weight polyphenols from two kinds of brown algae Morphological Taxonomy on Genus Myriactula (Choradariales,Phaeophyta) from China Coasts with Description of Two New Species (Ⅰ) Bromophenols from the brown alga Leathesia nana The characteristics of pigment-protein complexes from brown alga Undaria pinnatifida Studies on the Chemical Constituents from Marine Brown Alga Ishige okamurai (3) Studies on chemical constituents of the brown alga Dictyopteris divaricata