Novel rhythms of `N POT. 1'-acetyl-`N POT. 2'-formyl-5-methoxykynuramine and its precursor melatonin in water hyacinth: importance for phytoremediation - Tan, Dun-Xian; Manchester, Lucien C.; Di Mascio, Paolo; Martinez, Glaucia Regina; Prado, Fernanda Manso; Reiter, Russel J. (Faseb Journal, 2007)