Fernández J A, Vázquez M D, López J, Carballeira A
Area de Ecología, Facultad de Biología, Univ. Santiago de Compostela, 15782 Santiago de Compostela, Spain.
Environ Pollut. 2006 Jan;139(1):21-31. doi: 10.1016/j.envpol.2005.04.036. Epub 2005 Jul 22.
Samples of the aquatic bryophyte Fontinalis antipyretica Hedw. were transplanted to different sites with the aim of characterizing the kinetics of the uptake and discharge of heavy metals in the extra and intracellular compartments. The accumulation of metals in extracellular compartments, characterized by an initial rapid accumulation, then a gradual slowing down over time, fitted perfectly to a Michaelis-Menten model. The discharge of metals from the same compartment followed an inverse linear model or an inverse Michaelis-Menten model, depending on the metal. In intracellular sites both uptake and discharge occurred more slowly and progressively, following a linear model. We also observed that the acidity of the environment greatly affected metal accumulation in extracellular sites, even when the metals were present at relatively high concentrations, whereas the uptake of metals within cells was much less affected by pH.
将水生苔藓植物尖叶提灯藓（Fontinalis antipyretica Hedw.）的样本移植到不同地点，目的是表征重金属在细胞外和细胞内区室中的吸收和排出动力学。金属在细胞外区室中的积累，其特征是最初快速积累，然后随着时间逐渐减缓，完全符合米氏模型。同一区室中金属的排出遵循反线性模型或反米氏模型，具体取决于金属种类。在细胞内位点，吸收和排出都发生得更慢且是渐进的，遵循线性模型。我们还观察到，即使金属以相对较高的浓度存在，环境酸度也会极大地影响细胞外位点的金属积累，而细胞内金属的吸收受pH值的影响要小得多。
