[Curvibacter sp. strain HJ-1 induced the formation of aragonite under the condition of low Mg/Ca ratio].

微生物学报 Pub Date : 2017-03-04
Lei Li, Fuchun Li, Lu Liu, Chonghong Zhang, Jiejie Lü
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Abstract

Objective: To study the effects of bacteria on the species and morphology of carbonate minerals.

Methods: We conducted a series of cultural experiments in the medium with initial Mg/Ca ratio of 2 but without carbonate ion using Curvibacter sp. strain HJ-1 for 50 days. During the cultivation, bacterial density, precipitate quantities, calcium and magnesium concentration were determined. The morphologies of precipitated carbonates were observed using scanning electron microscopy, and mineral species of carbonate were determined by X-ray diffraction.

Results: Strain HJ-1 could induce the precipitation of carbonate minerals, the quality of carbonate gradually increased with the incubation time. XRD patterns showed that the mineral precipitates consisted of high-Mg calcite and aragonite. The percentage of aragonite in the precipitates was up to 86%. The morphology of carbonate minerals was multiform, including rod-shaped, dumbbell-shaped, spherical, tabular, as well as irregular and flake.

Conclusion: The formation of aragonite under the condition of low Mg/Ca ratio has a close correlation with extracellular polysaccharide secreted by Curvibacter sp. strain HJ-1.

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Curvibacter sp.菌株HJ-1在低Mg/Ca比条件下诱导文石形成。
目的:研究细菌对碳酸盐矿物种类和形态的影响。方法:在初始Mg/Ca比为2,不含碳酸盐离子的培养基中,以曲霉属HJ-1菌株为培养基进行一系列培养实验,培养时间为50 d。在培养过程中,测定细菌密度、沉淀量、钙、镁浓度。用扫描电镜观察了沉淀碳酸盐的形态,用x射线衍射测定了碳酸盐的矿物种类。结果:菌株HJ-1能诱导碳酸盐矿物析出,碳酸盐质量随培养时间的延长而逐渐提高。XRD分析表明,矿物沉淀由高镁方解石和文石组成。沉积物中文石的含量高达86%。碳酸盐矿物形态多样,有棒状、哑铃状、球形、板状、不规则、片状等。结论:低Mg/Ca条件下文石的形成与弯曲杆菌HJ-1菌株分泌的胞外多糖密切相关。
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期刊介绍: Acta Microbiologica Sinica(AMS) is a peer-reviewed monthly (one volume per year)international journal,founded in 1953.It covers a wide range of topics in the areas of general and applied microbiology.The journal publishes original papers,reviews in microbiological science,and short communications describing unusual observations. Acta Microbiologica Sinica has been indexed in Index Copernicus (IC),Chemical Abstract (CA),Excerpt Medica Database (EMBASE),AJ of Viniti (Russia),Biological Abstracts (BA),Chinese Science Citation Database (CSCD),China National Knowledge Infrastructure(CNKI),Institute of Scientific and Technical Information of China(ISTIC),Chinese Journal Citation Report(CJCR),Chinese Biological Abstracts,Chinese Pharmaceutical Abstracts,Chinese Medical Abstracts and Chinese Science Abstracts.
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