Effects of Calcium Concentration on Biocalcification of Synechococcus
>Biocalcification of microalgae is important for the precipitation of calcium carbonate and carbon cycle in nature. Getting knowledge of biocalcification is in favor of dealing with the global climate changes. However, the research of biocalcification is not sufficient at present. In this study, the effects of calcium concentration on biocalcification of Synechococcus PCC 7942 were investigated on laboratory scale. The growth of algae, the solution pH, alkalinity and the concentration of Ca2+ were measured during the experiments, while the precipitation was detected with scanning electron microscopy at the same time. The results showed that the existence of Synechococcus PCC 7942 promoted the precipitation of calcium carbonate in solution. But higher calcium concentration in solution has no active effects on the precipitation process. Under the experimental conditions, the most suitable concentration of calcium was 190 mg / L.
文章引用: 刘菲 , 李晓敏 , 范文宏 (2013) 钙离子浓度对聚球藻Synechococcus钙化过程的影响。 环境保护前沿， 3， 59-62. doi: 10.12677/AEP.2013.31B013
 T. C. Elizabeth, M. N. Guy, P. J. Noel. Neoproterozoic reef microstructures from the Little Dal Group. Northwestern Canada. Geology, 1993, 21（3）: 259-262.
 B. D. Lee, W. A. Apel, M. R. Walton. Screening of Cyanobacterial Species for Calcification. Biotechnology Progress, 2004, 20（5）: 1345-1351.
 S. A. Kranz, Dieter Wolf-GLADROW, Gernot Nehrke, et al. Calcium carbonate precipitation induced by the growth of the marine cyanobacterium Trichodesmium. Limnology and Oceanography, 2012, 55(6): 2563-2569.
 K. W. Demes, S. S. Bell, C. J. Dawes. The effects of phosphate on the biomineralization of the green alga, Halimeda incrassata (Ellis) Lam..Journal of Experi-mental Marine Biology and Ecology, 2009, 374(2): 123-127.
 Giulia Santomauro, Johannes Baier, Wanjing Huang, et al. Formation of Calcium Carbo-nate Polymorphs Induced by Living Microalgae. Journal of Biomaterials and Nanobiotechnology, 2012, 3: 413-420.
 I. A. Bundeleva, L. S. Shirokova, P. Bénézeth, O. S. Pokrovsky, E. I. Kompantseva, S. Balor. Calcium carbonate precipitation by anoxygenic phototrophic bacteria. Chemical Geology, 2012, 291: 116-131.
 C. Jansson, T. Northen. Calcifying cyanobacteria—the potential of biomineralization for carbon capture and storage. Current Opinion in Bio-technology, 2010, 21(3): 365-371.
 M. Pedley, M. Rogerson, R. Middleton. Freshwater calcite precipi-tates from in vitro mesocosm flume experiments: a case for biomediation of tufas. Sedimentology, 2009, 56(2): 511-527.
 M. Dittrich, M. Obst. Are Picoplankton Responsible for Calcite Precipitation in Lakes? . Ambio, 2004, 33: 559-564.
 F. Hammes, W. Verstraete. Key roles of pH and calcium metabolism in microbial carbonate. Environmental Science & Bio/Technology, 2002, 1: 3-7.
 M. Obst, M. Dit-trich. Calcium adsorption and changes of the surface microtopography of cyanobacteria studied by AFM, CFM, and TEM with respect to biogenic calcite nuc-leation. Geochemistry, Geophysics, Geosystems, 2006, 7(6): 1-15.
 M. Obst, B. Wehrli, M. Dittrich. CaCO3 nucleation of cyanobacteria: laboratory evi-dence for a passive surface-induced mechanism. Geo-biology, 2009, 7(3): 324-347.
 T. Kawaguchi, A. W. Decho. A laboratory investigation of cyanobacterial extracellular polymeric secretions (EPS) in influen-cing CaCO3 polymorphism. Journal of Crystal Growth, 2002, 240（1-2）: 230-235.
 T. J. Beveridge, P. H. Pouwels, M. Sára, et al. V. Function of S-layers. FEMS Microbiolory Reviews, 1997, 20: 99-149.