Clostridium sp. Controlled Morphology of Mg-Bearing Calcite and Its Implication for Possible Mechanism
详细信息
- 责任者：Li Fuchun (College of Resources and Environmental Sciences ; Nanjing Agricultural University ; Nanjing 210095 ; China) ; Ma Heng
- 刊名：Geological Journal of China Universities
- 出版年：2011
- 卷期：17(1)
- 关键词：镁方解石 ; magnesian calcite ; 细菌 ; bacteria ; 晶体结构 ; crystal structure
- 页码：p.13-20
- 图表：4 illus., 1 table, 27 refs.
- 分类号：0700
- issnNo：ISSN1006-7493
- isbnNo：CN32-1440/P
摘要
In this paper, culture experiments of carbonate precipitation using Lagoa Vermelha medium with 4∶1 molar Mg/Ca ratio were made under the mediation of Clostridium sp. (SN-1) from Qinghai Lake sediment. The results showed that 1) SN-1 helped promote the formation of Mg-bearing calcites with special shapes, but only irregular carbonate minerals were formed in the aseptic experiments; and 2) specifically shaped Mg-bearing calcite might nucleate and grow on the cell surfaces of bacteria, and then evolve from rod-like to dumbbell-like, cauliflower-like and spherulite shapes. The authors suggest that this is because more negative ionic groups concentrated on the polar ends than on the middle parts of rod-shaped bacteria, resulting in attracting more Ca 2+ and Mg 2+ on both polar ends of bacterial cells.
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