【摘要】 <正> 随着工农业的发展,越来越多的重金属污染物被排入海洋。在重金属污染物中,铜对海洋单细胞藻类的毒性仅次于汞和银。但因海水中铜的浓度比汞和银的高,使人们更加关注铜污染的潜在危害性。本文研究铜对中华盒形藻的细胞繁殖速率、叶绿素含量和对¹⁴C吸收的影响,并探讨铜对细胞形态及细胞周期的影响,以供环保部门制定合理的海洋水质标准参考,也可为今后深入研究重金属对海洋浮游植物毒性的机制提供必要的资料。一、材料与方法更多还原

【Abstract】 The growth of marine diatom Biddulphia sinensis was inhibited once the concentration of copper in medium was over 5ppb and the inhibition increased with increasing concentration of the metal. Different variations of cell morphology occurred on the diatom polluted by copper, most-commonly the elongation of the longitudinal axis. The rate of oxygen production and ¹⁴C uptaking by the cells were also affected. The duration of cell cycle delayed but that of the cell division phase was not influenced in the culture containing copper pollutant. The toxicity of copper on the diatom was related to the concentration of free metal but not that of the total metal.更多还原