scholarly journals Biogenic Mn-Oxides in Subseafloor Basalts

PLoS ONE ◽  
2015 ◽  
Vol 10 (6) ◽  
pp. e0128863 ◽  
Author(s):  
Magnus Ivarsson ◽  
Curt Broman ◽  
Håkan Gustafsson ◽  
Nils G. Holm
Keyword(s):  
Biogenic Mn Oxides ◽  
Mn Oxides

scholarly journals Biological Manganese Removal by Novel Halotolerant Bacteria Isolated from River Water

Biomolecules ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 941
Author(s):  
Van Khanh Nguyen ◽  
Myung-Gyu Ha ◽  
Ho Young Kang ◽  
Dinh Duc Nguyen
Keyword(s):  
River Water ◽  
Environmental Remediation ◽  
High Salinity ◽  
Resistant Bacteria ◽  
Contaminated Water ◽  
Halotolerant Bacteria ◽  
Manganese Removal ◽  
Biogenic Mn Oxides ◽  
Detoxification Mechanisms ◽  
Mn Oxides

Manganese-oxidizing bacteria have been widely investigated for bioremediation of Mn-contaminated water sources and for production of biogenic Mn oxides that have extensive applications in environmental remediation. In this study, a total of 5 Mn-resistant bacteria were isolated from river water and investigated for Mn removal. Among them, Ochrobactrum sp. NDMn-6 exhibited the highest Mn removal efficiency (99.1%). The final precipitates produced by this strain were defined as a mixture of Mn2O3, MnO2, and MnCO3. Optimal Mn-removal performance by strain NDMn-6 was obtained at a temperature range of 25–30 °C and the salinity of 0.1–0.5%. More interestingly, strain NDMn-6 could be resistant to salinities of up to 5%, revealing that this strain could be possibly applied for Mn remediation of high salinity regions or industrial saline wastewaters. This study also revealed the potential of self-detoxification mechanisms, wherein river water contaminated with Mn could be cleaned by indigenous bacteria through an appropriate biostimulation scheme.

scholarly journals Microbial communities and biogenic Mn-oxides in an on-site biofiltration system for cold Fe-(II)- and Mn(II)-rich groundwater treatment

2020 ◽  
Vol 710 ◽  
pp. 136386 ◽  
Author(s):  
Sandeepraja Dangeti ◽  
Joyce M. McBeth ◽  
Babak Roshani ◽  
Jonathan M. Vyskocil ◽  
Brian Rindall ◽  
...  
Keyword(s):  
Microbial Communities ◽  
Groundwater Treatment ◽  
Biogenic Mn Oxides ◽  
Mn Oxides

Sorption of Co Ions on Biogenic Mn Oxides Produced by a Mn-Oxidizing Fungus, Paraconiothyrium sp.-like Strain

2007 ◽  
Vol 20-21 ◽  
pp. 607-610
Author(s):  
Keiko Sasaki ◽  
M. Matsuda ◽  
T. Urata ◽  
Tsuyoshi Hirajima ◽  
H. Konno
Keyword(s):  
Redox Reaction ◽  
Mn Oxide ◽  
Biogenic Mn Oxide ◽  
Biogenic Mn Oxides ◽  
Mn Oxides

Sorption of Co(II) on the biogenic Mn oxide produced by a Paraconiothyrium sp.-like strain was investigated. The biogenic Mn oxide, which was characterized to be poorly crystalline birnessite (Na4Mn(III) 6Mn(IV) 8O27 ·9H2O) bearing Mn(III) and Mn(IV) in the structure, showed approximately 6.0-fold higher efficiency for Co(II) sorption than a synthetic Mn oxide. XP-spectra of Co 2p for the biogenic and synthetic Mn oxides after Co(II) sorption indicate that Co was immobilized as Co(III) on the surface of Mn oxides, clearly suggesting that redox reaction occurs between Co(II) ions and each Mn oxides. The Co(II) ions would be initially sorbed on the vacant sites of the surface of biogenic Mn oxide, and then oxidized to Co(III) by neighbor Mn(III/IV) atoms to release Mn(II). For the synthetic Mn oxide, release of Mn(II) was negligibly small because the oxidant is only Mn(IV) in ramsdellite (γ-MnO2). The Mn(II) release from the biogenic Mn oxide during Co(II) adsorption would be not only from weakly bounded Mn(II), but also from redox reaction between Mn(III/IV) and Co(II) ions.

Formation of nano-crystalline todorokite from biogenic Mn oxides

2010 ◽  
Vol 74 (11) ◽  
pp. 3232-3245 ◽  
Author(s):  
Xiong Han Feng ◽  
Mengqiang Zhu ◽  
Matthew Ginder-Vogel ◽  
Chaoying Ni ◽  
Sanjai J. Parikh ◽  
...  
Keyword(s):  
Nano Crystalline ◽  
Biogenic Mn Oxides ◽  
Mn Oxides

scholarly journals Role of extracellular polymeric substances (EPS) from <i>Pseudomonas putida</i> strain MnB1 in dissolution of natural rhodochrosite

2014 ◽  
Vol 11 (5) ◽  
pp. 7273-7290 ◽  
Author(s):  
H. Wang ◽  
X. Pan
Keyword(s):  
Fourier Transform ◽  
Extracellular Polymeric Substances ◽  
Ftir Analysis ◽  
Free Treatment ◽  
Initial Ph ◽  
Biogenic Mn Oxides ◽  
The Fourier Transform ◽  
Mn Oxides ◽  
Mediated Oxidation

Abstract. Microbially mediated oxidation of Mn(II) to Mn oxides have been demonstrated in previous studies, however, the mechanisms of bacteria how to dissolve and oxidize using a solid Mn(II) origin are poorly understood. In this study, we examined the role of extracellular polymeric substances (EPS) from P. putida strain MnB1 in enhancing dissolution of natural rhodochrosite. The results showed that P. putida strain MnB1 cell can effectively dissolve and oxidize natural rhodochrosite to generate Mn oxides, and EPS were found to play an important role in increasing dissolution of natural rhodochrosite. Compared with EPS-free treatment, dissolution rate of natural rhodochrosite in the presence of bacterial EPS was significantly increased with decreasing initial pH and increasing EPS concentration, ionic strength and rhodochrosite dosage (p < 0.05). The fourier-transform infrared spectroscopy (FTIR) analysis implies that the functional groups like N-H, C=O and C-H in EPS contributed to the dissolution of natural rhodochrosite. This study is helpful for understanding the mechanisms of the formation of biogenic Mn oxides using a solid Mn(II) origin.

scholarly journals Production of Biogenic Mn Oxides by Leptothrix discophora SS-1 in a Chemically Defined Growth Medium and Evaluation of Their Pb Adsorption Characteristics

1999 ◽  
Vol 65 (1) ◽  
pp. 175-180 ◽  
Author(s):  
Yarrow M. Nelson ◽  
Leonard W. Lion ◽  
William C. Ghiorse ◽  
Michael L. Shuler
Keyword(s):  
Specific Surface ◽  
Adsorption Isotherms ◽  
Phase Distribution ◽  
Dry Weight ◽  
Mineral Salts ◽  
Leptothrix Discophora ◽  
Mn Oxide ◽  
Biogenic Mn Oxide ◽  
Biogenic Mn Oxides ◽  
Mn Oxides

Biogenic Mn oxides were produced by the bacterium Leptothrix discophora SS-1 (= ATCC 3182) in a chemically defined mineral salts medium, and the Pb binding and specific surface area of these oxides were characterized. Growth of SS-1 in the defined medium with pyruvate as a carbon and energy source required the addition of vitamin B12. Complete oxidation of Mn(II) within 60 h required the addition of ≥0.1 μM FeSO4. Pb adsorption isotherms were determined for the biogenic Mn oxides (and associated cells with their extracellular polymer) and compared to the Pb adsorption isotherms of cells and exopolymer alone, as well as to abiotic Mn oxides. The Pb adsorption to cells and exopolymer with biogenic Mn oxides (0.8 mmol of Mn per g) at pH 6.0 and 25°C was 2 orders of magnitude greater than the Pb adsorption to cells and exopolymer alone (on a dry weight basis). The Pb adsorption to the biogenic Mn oxide was two to five times greater than the Pb adsorption to a chemically precipitated abiotic Mn oxide and several orders of magnitude greater than the Pb adsorption to two commercially available crystalline MnO2 minerals. The N2Brunauer-Emmet-Teller specific surface areas of the biogenic Mn oxide and fresh Mn oxide precipitate (224 and 58 m2/g, respectively) were significantly greater than those of the commercial Mn oxide minerals (0.048 and 4.7 m2/g). The Pb adsorption capacity of the biogenic Mn oxide also exceeded that of a chemically precipitated colloidal hydrous Fe oxide under similar solution conditions. These results show that amorphous biogenic Mn oxides similar to those produced by SS-1 may play a significant role in the control of trace metal phase distribution in aquatic systems.

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