The Roles of Mg over the Precipitation of Carbonate and Morphological Formation in the Presence of Arthrobacter sp. Strain MF-2
The Roles of Mg over the Precipitation of Carbonate and Morphological Formation in the Presence of Arthrobacter sp. Strain MF-2
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DOI：
10.1080/01490451.2017.1421727
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发表时间：
2018-02
影响因子：
2.3
通讯作者：
Chonghong Zhang;Fuchun Li;Xuelin Li;Lei Li;Lu Liu
中科院分区：
文献类型：
--
作者：
Chonghong Zhang;Fuchun Li;Xuelin Li;Lei Li;Lu Liu
ABSTRACT Microbial mineralization of carbonate is a research subject widely studied in the past decades. The magnesium ions (Mg2+), present in water systems, are a key determinant in biomineralization process of carbonate and they are widely found in calcium-based biominerals as an accessory component. However, the crystallization mechanism and morphological change of carbonate polymorphs in the presence of Mg2+ ions has not been clarified sufficiently. In this report, a series of culture experiments were performed for 50 days using the Arthrobacter sp. strain MF-2 in a M2 culture medium using Mg/Ca molar ratios (R) of 0, 1.5, 3, 6, 9, and 12 in solution. And the roles of Mg2+ ions on the crystal growth and morphological change of biogenic carbonate were investigated. Experimental results show: (1) MF-2 could induce aragonite, high-Mg calcite, and Ca-dolomite formation in M2 culture media with different R values. The increased stability of amorphous calcium carbonate suggests Mg2+ ions inhibit carbonate crystallization. (2) The mineral morphologies were varied (rod-shaped, dumbbell-shaped, cauliflower-like, spherical, etc.) in the medium with R = 1.5, but they became simple (spherical and lamellar) in high Mg2+ concentrations (Mg > 0.15 M, R > 3). (3) The increased ionic strength of Mg2+ ions in the environment has an influence on the polymorphs and morphologies of carbonate formed by controlling the metabolism of strain MF-2 and the activity of carbonic anhydrase.
