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Chen M, Cao D, Li B, Pang H, Zheng C. Sodium citrate increases the aggregation capacity of calcium ions during microbial mineralization to accelerate the formation of calcium carbonate. ENVIRONMENTAL RESEARCH 2023; 224:115479. [PMID: 36796605 DOI: 10.1016/j.envres.2023.115479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2022] [Revised: 01/25/2023] [Accepted: 02/09/2023] [Indexed: 06/18/2023]
Abstract
The microbially induced carbonate precipitation (MICP) technique is widely used in soil heavy metal pollution control. Microbial mineralization involves extended mineralization times and slow crystallization rates. Thus, it is important to discover a method to accelerate mineralization. In this study, we selected six nucleating agents to screen and investigated the mineralization mechanism using polarized light microscopy, scanning electron microscopy, X-ray diffraction and Fourier-transform infrared spectroscopy. The results showed that sodium citrate removed 90.1% Pb better than traditional MICP and generated the highest amount of precipitation. Interestingly, due to the addition of sodium citrate (NaCit), the rate of crystallization increased and vaterite was stabilized. Moreover, we constructed a possible model to explain that NaCit increases the aggregation capacity of calcium ions during microbial mineralization to accelerate the formation of calcium carbonate (CaCO3). Thus, sodium citrate can increase the rate of MICP bioremediation, which is important for improving MICP efficiency.
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Affiliation(s)
- Minjie Chen
- School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou, 014010, People's Republic of China; Inner Mongolia Engineering Research Center of Evaluation and Restoration in the Mining Ecological Environments, Baotou, 014010, People's Republic of China
| | - Dan Cao
- School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou, 014010, People's Republic of China; Inner Mongolia Engineering Research Center of Evaluation and Restoration in the Mining Ecological Environments, Baotou, 014010, People's Republic of China
| | - Bowen Li
- School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou, 014010, People's Republic of China; Inner Mongolia Engineering Research Center of Evaluation and Restoration in the Mining Ecological Environments, Baotou, 014010, People's Republic of China
| | - Hao Pang
- School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou, 014010, People's Republic of China; Inner Mongolia Engineering Research Center of Evaluation and Restoration in the Mining Ecological Environments, Baotou, 014010, People's Republic of China
| | - Chunli Zheng
- School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou, 014010, People's Republic of China; Inner Mongolia Engineering Research Center of Evaluation and Restoration in the Mining Ecological Environments, Baotou, 014010, People's Republic of China; School of Resource and Environmental Engineering, Shanghai Polytechnic University, Shanghai, 310014, People's Republic of China.
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Han J, Xue JF, Xu M, Gui BS, Kuang L, Ouyang JM. Coordination dynamics and coordination mechanism of a new type of anticoagulant diethyl citrate with ca(2+) ions. Bioinorg Chem Appl 2013; 2013:354736. [PMID: 24453996 PMCID: PMC3884681 DOI: 10.1155/2013/354736] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2013] [Revised: 11/14/2013] [Accepted: 11/29/2013] [Indexed: 11/17/2022] Open
Abstract
Diethyl citrate (Et2Cit) is a new potential anticoagulant. The coordination dynamics and coordination mechanism of Et2Cit with Ca(2+) ions and the effect of pH on the complex were examined. The result was compared with that for the conventional anticoagulant sodium citrate (Na3Cit). The reaction order (n) of Et2Cit and Na3Cit with Ca(2+) was 2.46 and 2.44, respectively. The reaction rate constant (k) was 120 and 289 L·mol(-1) ·s(-1). The reverse reaction rate constant (k re) was 0.52 and 0.15 L·mol(-1) ·s(-1), respectively. It is indicated that the coordination ability of Et2Cit with Ca(2+) was weaker than that of Na3Cit. However, the dissociation rate of the calcium complex of Et2Cit was faster than that of Na3Cit. Increased pH accelerated the dissociation rate of the complex and improved its anticoagulant effect. The Et2Cit complex with calcium was synthesized and characterized by elemental analysis, XRD, FT-IR, (1)H NMR, and ICP. These characteristics indicated that O in -COOH and C-O-C of Et2Cit was coordinated with Ca(2+) in a bidentate manner with 1 : 1 coordination proportion; that is, complex CaEt2Cit was formed. Given that CaEt2Cit released Ca(2+) more easily than Na3Cit, a calcium solution was not needed in intravenous infusions using Et2Cit as anticoagulant unlike using Na3Cit. Consequently, hypocalcemia and hypercalcemia were avoided.
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Affiliation(s)
- Jin Han
- Department of Nephrology, The Second Hospital of Xi'an Jiaotong University, Xi'an 710004, China
| | - Jun-Fa Xue
- Institute of Biomineralization and Lithiasis Research, Jinan University, Guangzhou 510632, China
| | - Meng Xu
- Institute of Biomineralization and Lithiasis Research, Jinan University, Guangzhou 510632, China
| | - Bao-Song Gui
- Department of Nephrology, The Second Hospital of Xi'an Jiaotong University, Xi'an 710004, China
| | - Li Kuang
- Institute of Biomineralization and Lithiasis Research, Jinan University, Guangzhou 510632, China
| | - Jian-Ming Ouyang
- Institute of Biomineralization and Lithiasis Research, Jinan University, Guangzhou 510632, China
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Williams E, Lin MH, Harbison S, Fleming R. The development of a method of suspension RNA-FISH for forensically relevant epithelial cells using LNA probes. Forensic Sci Int Genet 2013; 9:85-92. [PMID: 24528586 DOI: 10.1016/j.fsigen.2013.11.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2013] [Revised: 11/25/2013] [Accepted: 11/28/2013] [Indexed: 11/27/2022]
Abstract
Messenger RNA profiling is becoming a common method for body fluid identification in forensic science but there are disadvantages when cell mixtures are present from more than one individual. A method that could identify and separate such cell mixtures would simplify downstream analysis. To do this, we have developed a novel method of RNA suspension-fluorescent in situ hybridization (RNA S-FISH) using a locked nucleic acid (LNA) probe for the keratin 10 (KRT10) mRNA that is suitable as a potential marker for epithelial cells. As sample size may be restricted in forensic samples, this method has focused on minimizing cell loss whilst maintaining signal strength. Furthermore, we have shown that it is possible to obtain full DNA profiles from 150 RNA S-FISH labeled cells isolated using laser microdissection.
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Affiliation(s)
- Eletra Williams
- School of Chemical Sciences, The University of Auckland, Auckland, New Zealand; ESR, Private Bag 92021, Auckland, New Zealand
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