Effects of neodymium on growth and physiological characteristics of Microcystis aeruginosa

Abstract：To investigate the effect of neodymium (Nd) on Microcystis aeruginosa, the growth and physiological changes were studied by lab cultured experiments. The results showed that the content of chlorophyll a (Chi-a), soluble protein and the activity of superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) increased compared with the control (Nd3+-free), and the growth of M. aeruginosa was stimulated in the treatments of initial Nd3+ concentration ≤1 mg/L; while the treatments of initial Nd3+ concentration was in the range of 5.00-10.00 mg/L, the content ofmalondiadehyde (MDA) increased immediately but the activity of CAT reduced, which resulted in weakened M. aeruginosas ability to eliminate the active oxygen and the ruin of antioxidant defense system, and stunting the growth ofM. aeruginosa.With the initial Nd3+ concentration of 50 mg/L, the growth of M. aeruginosa was totally stunted. The ultrastructure showed that excess Nd3+ could lead to the decrease of thylakoid and the increase of fat particle in cells of M. aeruginosa, and the cell membrane became rough and even broken, causing an irreversible damage to algal cells. 作者： Author： WANG Yingjun[1]  JIN Hangbiao[1]  DENG Shihuai[1]  CHEN Yan[1]  YU You[2] 作者單位： College of Resources and Enviroment, Sichuan Agricultural University, Yaan 625014, ChinaEnvironmental Protection Agency of Wuxi, Wuxi 405800,China 期 刊： 稀土學報（英文版）   ISTICEISCI Journal： JOURNAL OF RARE EARTHS 年，卷(期)： 2011, 29(4) 分類號： Q945.78 Keywords： Microcystis aeruginosa    neodymium    growth    ultrastructure    機標分類號： X52 X17 機標關鍵詞： Microcystis aeruginosa    the growth    antioxidant defense system    physiological changes    initial    superoxide dismutase    cell membrane    active oxygen    peroxidase    cells    range of    results    control    CAT    SOD    POD    MDA    fat 基金項目： Educational Commission of Sichuan Province of China，Innovation Programme of College Students of China

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