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Journal articles on the topic 'Acidophilic iron oxidizers'

Author: Grafiati

Published: 4 June 2021

Last updated: 5 February 2022

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1

Hedrich, Sabrina, Michael Schlömann, and D. Barrie Johnson. "The iron-oxidizing proteobacteria." Microbiology 157, no. 6 (2011): 1551–64. http://dx.doi.org/10.1099/mic.0.045344-0.

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The ‘iron bacteria’ are a collection of morphologically and phylogenetically heterogeneous prokaryotes. They include some of the first micro-organisms to be observed and described, and continue to be the subject of a considerable body of fundamental and applied microbiological research. While species of iron-oxidizing bacteria can be found in many different phyla, most are affiliated with the Proteobacteria. The latter can be subdivided into four main physiological groups: (i) acidophilic, aerobic iron oxidizers; (ii) neutrophilic, aerobic iron oxidizers; (iii) neutrophilic, anaerobic (nitrate

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2

Quatrini, Raquel, Verónica Martínez, Hector Osorio, et al. "Iron Homeostasis Strategies in Acidophilic Iron Oxidizers: Comparative Genomic Analyses." Advanced Materials Research 20-21 (July 2007): 531–34. http://dx.doi.org/10.4028/www.scientific.net/amr.20-21.531.

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An understanding of the physiology and metabolic complexity of microbial consortia involved in metal solubilization is a prerequisite for the rational improvement of bioleaching technologies. Among the most challenging aspects that remain to be addressed is how aerobic acidophiles, especially Fe(II)-oxidizers, contend with the paradoxical hazards of iron overload and iron deficiency, each with deleterious consequences for growth. Homeostatic mechanisms regulating the acquisition, utilization/oxidation, storage and intracellular mobilization of cellular iron are deemed to be critical for fitnes

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Berthelot, Deborah, L. G. Leduc, and G. D. Ferroni. "The absence of psychrophilic Thiobacillus ferrooxidans and acidophilic heterotrophic bacteria in cold, tailings effluents from a uranium mine." Canadian Journal of Microbiology 40, no. 1 (1994): 60–63. http://dx.doi.org/10.1139/m94-009.

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Iron-oxidizing autotrophs (mainly Thiobacillus ferrooxidans) and acidophilic heterotrophs were recovered and quantified at an incubation temperature of 18 °C, in four tailings-effluent samples obtained from the environment of a uranium mine in Ontario, Canada. The samples were collected during winter when the temperatures of the effluents were in the range 0.5–5.0 °C. Iron-oxidizing autotrophs were recovered in the four samples and their numbers ranged from 3 ± 2 to 185 ± 18 colony-forming units/mL; acidophilic heterotrophs were recovered in three of the four samples and their numbers ranged f

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Panyushkina, Anna, Aleksandr Bulaev, and Aleksandr V. Belyi. "Unraveling the Central Role of Sulfur-Oxidizing Acidiphilium multivorum LMS in Industrial Bioprocessing of Gold-Bearing Sulfide Concentrates." Microorganisms 9, no. 5 (2021): 984. http://dx.doi.org/10.3390/microorganisms9050984.

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Acidiphilium multivorum LMS is an acidophile isolated from industrial bioreactors during the processing of the gold-bearing pyrite-arsenopyrite concentrate at 38–42 °C. Most strains of this species are obligate organoheterotrophs that do not use ferrous iron or reduced sulfur compounds as energy sources. However, the LMS strain was identified as one of the predominant sulfur oxidizers in acidophilic microbial consortia. In addition to efficient growth under strictly heterotrophic conditions, the LMS strain proved to be an active sulfur oxidizer both in the presence or absence of organic compou

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Osorio, Hector, Verónica Martínez, Felipe A. Veloso, et al. "Iron homeostasis strategies in acidophilic iron oxidizers: Studies in Acidithiobacillus and Leptospirillum." Hydrometallurgy 94, no. 1-4 (2008): 175–79. http://dx.doi.org/10.1016/j.hydromet.2008.05.038.

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6

Berthelot, Deborah, L. G. Leduc, and G. D. Ferroni. "Temperature studies of iron-oxidizing autotrophs and acidophilic heterotrophs isolated from uranium mines." Canadian Journal of Microbiology 39, no. 4 (1993): 384–88. http://dx.doi.org/10.1139/m93-056.

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Iron-oxidizing autotrophs and acidophilic heterotrophs were quantified at an incubation temperature of 18 °C in several samples obtained from the bioleaching areas of two uranium mines in Ontario, Canada. All samples were mine-water samples with temperatures in the range 13–18 °C. Iron-oxidizing autotrophs ranged from 2683 ± 377 to 245 000 ± 20 205 colony-forming units∙mL−1 and were always numerically superior to acidophilic heterotrophs, which ranged from 40 ± 8 to 9650 ± 161 colony-forming units∙mL−1. For each sample, approximately 20 isolates of each nutritional group were examined for the

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7

Breuker, Anja, Anna Blazejak, Klaus Bosecker, and Axel Schippers. "Diversity of Iron Oxidizing Bacteria from Various Sulfidic Mine Waste Dumps." Advanced Materials Research 71-73 (May 2009): 47–50. http://dx.doi.org/10.4028/www.scientific.net/amr.71-73.47.

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More than 100 cultures of acidophilic Fe(II)- and/or sulfur-oxidizing microorganisms from mine waste dumps in 10 different countries all over the world have been maintained in liquid media in the BGR-strain collection for many years. Our 16S rDNA analysis showed that most of the cultivated Fe(II)-oxidizers belong to four genera: Acidithiobacillus, Acidimicrobium, “Ferrimicrobium” and Leptospirillum. All analyzed Acidithiobacillus strains were identified as At. ferrooxidans. The Leptospirillum strains were affiliated with L. ferriphilum or L. ferrooxidans. The Gram-positive strains related to A

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Bomberg, Malin, Jarno Mäkinen, Marja Salo, and Päivi Kinnunen. "High Diversity in Iron Cycling Microbial Communities in Acidic, Iron-Rich Water of the Pyhäsalmi Mine, Finland." Geofluids 2019 (March 10, 2019): 1–17. http://dx.doi.org/10.1155/2019/7401304.

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Microbial communities of iron-rich water in the Pyhäsalmi mine, Finland, were investigated with high-throughput amplicon sequencing and qPCR targeting bacteria, archaea, and fungi. In addition, the abundance ofLeptospirillumandAcidithiobacilluswas assessed with genus-specific qPCR assays, and enrichment cultures targeting aerobic ferrous iron oxidizers and ferric iron reducers were established. The acidic (pH 1.4–2.3) mine water collected from 240 m, 500 m, and 600 m depth from within the mine had a high microbial diversity consisting of 63-114 bacterial, 10-13 archaeal, and 104-117 fungal gen

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9

Issotta, Francisco, Paulo C. Covarrubias, Ana Moya-Beltrán, et al. "16S rRNA and Multilocus Phylogenetic Analysis of the Iron Oxidizing Acidophiles of the Acidiferrobacteraceae Family." Solid State Phenomena 262 (August 2017): 339–43. http://dx.doi.org/10.4028/www.scientific.net/ssp.262.339.

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The family Acidiferrobacteraceae (order Acidiferrobacterales) currently contains three genera of chemolithoautotrophs: Sulfuricaulis (2016), Sulfurifustis (2015) and Acidiferrobacter (2011). While the two former are neutrophilic sulfur oxidizers isolated from lake sediments in Japan, the latter is an extremely acidophilic, moderately osmophilic, thermotolerant iron/sulfur oxidizer known to occur in macroscopic streamers in Rio Tinto, Spain and in acid waters worldwide. The type strains of both Sulfuricaulis limnicola (HA5T) and Sulfurifustis variabilis (skN76T) have been sequenced, and the dra

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Hallberg, Kevin B., Kris Coupland, Sakurako Kimura, and D. Barrie Johnson. "Macroscopic Streamer Growths in Acidic, Metal-Rich Mine Waters in North Wales Consist of Novel and Remarkably Simple Bacterial Communities." Applied and Environmental Microbiology 72, no. 3 (2006): 2022–30. http://dx.doi.org/10.1128/aem.72.3.2022-2030.2006.

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ABSTRACT The microbial composition of acid streamers (macroscopic biofilms) in acidic, metal-rich waters in two locations (an abandoned copper mine and a chalybeate spa) in north Wales was studied using cultivation-based and biomolecular techniques. Known chemolithotrophic and heterotrophic acidophiles were readily isolated from disrupted streamers, but they accounted for only <1 to 7% of the total microorganisms present. Fluorescent in situ hybridization (FISH) revealed that 80 to 90% of the microbes in both types of streamers were β-Proteobacteria. Terminal restriction fragment length pol

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Ullrich, Sophie R., Anja Poehlein, Rolf Daniel, et al. "Comparative Genomics Underlines the Functional and Taxonomic Diversity of Novel “Ferrovum” Related Iron Oxidizing Bacteria." Advanced Materials Research 1130 (November 2015): 15–18. http://dx.doi.org/10.4028/www.scientific.net/amr.1130.15.

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Although acidophilic iron oxidizing bacteria related to “Ferrovum myxofaciens” P3G have been detected in various mining sites the knowledge about their physiology is limited to the type strain “F. myxofaciens” P3G. In order to further the knowledge on the metabolic capacity of “Ferrovum” related iron oxidizers we conducted a comparative genome analysis of three “Ferrovum” strains: JA12, PN-J185 and Z-31 (Z-31). The results of the phylogenetic analysis and the genome-to-genome distance calculation indicate that Z-31 belongs to a different “Ferrovum” species than JA12 and PN-J185. Comparative ge

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Dave, Shailesh R., T. J. Shah, and D. R. Tipre. "Development of an Extremophilic Iron Oxidizing Consortium and a Fixed Film Bioreactor for Generation of Ferric Lixivient." Advanced Materials Research 20-21 (July 2007): 501–4. http://dx.doi.org/10.4028/www.scientific.net/amr.20-21.501.

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Acidophilic iron-oxidizing microorganisms are important for both, the environment and for biotechnological applications. Biogeneration of ferric from ferrous iron was studied using an iron-oxidizing consortium developed during polymetallic concentrate bioleaching. A promising iron oxidizing consortium was developed by adaptation and selection, which resulted in bacterial iron oxidation activity under the extreme conditions of 250 g/L ferrous sulphate as initial substrate and 500 g/L ferric sulphate. The development of iron oxidizers improved the iron oxidation rate from 0.019 to as high as 0.6

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Aspiazu, Carlos L., Paulina Aguirre, Sabrina Hedrich, and Axel Schippers. "Microbial Community Analysis inside a Biooxidation Heap for Gold Recovery in Equador." Solid State Phenomena 262 (August 2017): 135–38. http://dx.doi.org/10.4028/www.scientific.net/ssp.262.135.

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In a mine owned by the company Orenas S.A. (Equador), a biooxidation process for gold recovery has been developed. Refractory gold ore was crushed, milled and 500 ton of flotation concentrate was agglomerated by coating a support rock. This was piled up on a liner and the biooxidation process in the heap of 35x25x6 m3 was run for approximately 150 days. The oxidized material was subsequently removed for further processing. An outcrop allowed for depth dependent sampling of altogether 36 samples at three sites over the complete depth of 6 m. The fine fraction was removed from the host rock and

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Vergara, Eva, Gonzalo Neira, Carolina González, Diego Cortez, Mark Dopson, and David S. Holmes. "Evolution of Predicted Acid Resistance Mechanisms in the Extremely Acidophilic Leptospirillum Genus." Genes 11, no. 4 (2020): 389. http://dx.doi.org/10.3390/genes11040389.

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Organisms that thrive in extremely acidic environments (≤pH 3.5) are of widespread importance in industrial applications, environmental issues, and evolutionary studies. Leptospirillum spp. constitute the only extremely acidophilic microbes in the phylogenetically deep-rooted bacterial phylum Nitrospirae. Leptospirilli are Gram-negative, obligatory chemolithoautotrophic, aerobic, ferrous iron oxidizers. This paper predicts genes that Leptospirilli use to survive at low pH and infers their evolutionary trajectory. Phylogenetic and other bioinformatic approaches suggest that these genes can be c

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15

Bacelar-Nicolau, Paula, and D. Barrie Johnson. "Leaching of Pyrite by Acidophilic Heterotrophic Iron-Oxidizing Bacteria in Pure and Mixed Cultures." Applied and Environmental Microbiology 65, no. 2 (1999): 585–90. http://dx.doi.org/10.1128/aem.65.2.585-590.1999.

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ABSTRACT Seven strains of heterotrophic iron-oxidizing acidophilic bacteria were examined to determine their abilities to promote oxidative dissolution of pyrite (FeS2) when they were grown in pure cultures and in mixed cultures with sulfur-oxidizingThiobacillus spp. Only one of the isolates (strain T-24) oxidized pyrite when it was grown in pyrite-basal salts medium. However, when pyrite-containing cultures were supplemented with 0.02% (wt/vol) yeast extract, most of the isolates oxidized pyrite, and one (strain T-24) promoted rates of mineral dissolution similar to the rates observed with th

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Falagán, Carmen, F. J. Sánchez-España, and D. Barrie Johnson. "Microbiological Communities in Two Acidic Mine Pit Lakes in the Iberian Pyrite Belt (IPB), Spain." Advanced Materials Research 825 (October 2013): 19–22. http://dx.doi.org/10.4028/www.scientific.net/amr.825.19.

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The microbiology and geochemistry of two pit lakes at former metal mines (Cueva de la Mora and Guadiana) located in the Iberian Pyrite Belt in Spain were investigated. Both lakes are meromictic, with more acidic and oxidized mixolimnion zones overlying anoxic monimolimnion zones, and transitional chemoclines with characteristic sharp pH and redox potential gradients. Stratification in the pit lakes was reflected in the size and diversity of the microbial communities in the different zones, with the chemocline of Cueva de la Mora pit lake and the hypolimnion (the lower layer of the mixolimnion)

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Bulaev, Aleksander. "Resistance of Moderately Thermophilic Acidophilic Microorganisms to Ferric Iron Ions." Solid State Phenomena 262 (August 2017): 471–75. http://dx.doi.org/10.4028/www.scientific.net/ssp.262.471.

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Resistance of microorganisms predominating in biohydrometallurgical processes including bacteria of the genus Sulfobaсillus and archaea of the genus Acidiplasma to ferric iron ions was studied. Capabilities of the strains for growth and ferrous iron oxidation in the media containing high concentrations of ferric iron ions (of 250 to 1000 mM) were evaluated. Ferric iron ions significantly inhibited oxidative activity and growth of the studied microorganisms. It was revealed that bacteria of the genus Sulfobacillus were not able to oxidize ferrous iron actively when ferric iron concentration exc

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18

Ullrich, Sophie R., Anja Poehlein, Gloria J. Levicán, Michael Schlömann, and Martin Mühling. "Molecular Response of the Acidophilic Iron Oxidizer “Ferrovum” sp. JA12 to the Exposure to Elevated Concentrations of Ferrous Iron." Solid State Phenomena 262 (August 2017): 482–86. http://dx.doi.org/10.4028/www.scientific.net/ssp.262.482.

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The response to elevated ferrous iron concentrations was investigated in the acidophilic iron oxidizer “Ferrovum” sp. JA12 at transcriptome level. Detoxification of reactive oxygen species appears to be the most important strategy to cope with oxidative stress. The proposed iron oxidation model in “Ferrovum” spp. was supported by the transcriptome data of “Ferrovum” sp. JA12. Several gene candidates of the iron oxidation model are organized in a gene cluster conserved in iron oxidizing betaproteobacteria and zetaproteobacteria possibly indicating a common origin of iron oxidation.

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Bridge, Toni A. M., and D. Barrie Johnson. "Reduction of Soluble Iron and Reductive Dissolution of Ferric Iron-Containing Minerals by Moderately Thermophilic Iron-Oxidizing Bacteria." Applied and Environmental Microbiology 64, no. 6 (1998): 2181–86. http://dx.doi.org/10.1128/aem.64.6.2181-2186.1998.

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ABSTRACT Five moderately thermophilic iron-oxidizing bacteria, including representative strains of the three classified species (Sulfobacillus thermosulfidooxidans, Sulfobacillus acidophilus, and Acidimicrobium ferrooxidans), were shown to be capable of reducing ferric iron to ferrous iron when they were grown under oxygen limitation conditions. Iron reduction was most readily observed when the isolates were grown as mixotrophs or heterotrophs with glycerol as an electron donor; in addition, some strains were able to couple the oxidation of tetrathionate to the reduction of ferric iron. Cyclin

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Khaleque, Himel Nahreen, Homayoun Fathollazadeh, Carolina González, et al. "Unlocking Survival Mechanisms for Metal and Oxidative Stress in the Extremely Acidophilic, Halotolerant Acidihalobacter Genus." Genes 11, no. 12 (2020): 1392. http://dx.doi.org/10.3390/genes11121392.

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Microorganisms used for the biohydrometallurgical extraction of metals from minerals must be able to survive high levels of metal and oxidative stress found in bioleaching environments. The Acidihalobacter genus consists of four species of halotolerant, iron–sulfur-oxidizing acidophiles that are unique in their ability to tolerate chloride and acid stress while simultaneously bioleaching minerals. This paper uses bioinformatic tools to predict the genes and mechanisms used by Acidihalobacter members in their defense against a wide range of metals and oxidative stress. Analysis revealed the pre

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Scholtissek, Anika, Sophie R. Ullrich, Martin Mühling, Michael Schlömann, Caroline E. Paul, and Dirk Tischler. "A thermophilic-like ene-reductase originating from an acidophilic iron oxidizer." Applied Microbiology and Biotechnology 101, no. 2 (2016): 609–19. http://dx.doi.org/10.1007/s00253-016-7782-3.

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Gherman, Vasile-Daniel, Jean-Gabriel Breheret, Petru Negrea, and Marilena Motoc. "The Testing of the Capacity of an Acidophilic Consortium from an Old Mine Concerning the Elimination of Iron and Manganese from the Underground Waters." Revista de Chimie 59, no. 6 (2008): 712–15. http://dx.doi.org/10.37358/rc.08.6.1862.

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During the potabilisation processes of underground waters, important quantities of energy are being consumed. In this study, the experimental results obtained at the testing of the elimination of iron and manganese capacity from acidophilic microorganisms consortium located on the gelatinous formations from an old no longer functional mine situated in the South-West of Romania in some underground waters is presented. The experiment was realized with experimental 3 liters plexiglass column pipes for a period of six days. During this time, the capacity of microorganisms consortium inoculated on

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Johnson, D. Barrie, Barry M. Grail, and Violaine Bonnefoy. "New Insights into Salt-Tolerance in Acidophilic Iron-Oxidising Bacteria." Advanced Materials Research 1130 (November 2015): 3–6. http://dx.doi.org/10.4028/www.scientific.net/amr.1130.3.

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Colonies of iron-oxidising acidophilic bacteria were isolated on solid media containing up to 500 mM NaCl from non-saline samples from the Rio Tinto (Spain). One of these isolates was identified as an "Acidithiobacillusferriphilus" strain. Laboratory cultures of the type strain ofAcidithiobacillusferriduransgrown on hydrogen for one year were also found to adapt to the presence of 500 mM salt. This culture also grew on sulfur, but not on ferrous iron, in media containing 500 mM NaCl. It regained its ability to oxidise iron only after protracted incubation in salt-free media. Molecular analysis

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Escudero, Lorena, Jonathan Bijman, Guajardo M. Mariela, Juan José Pueyo Mur, Guillermo Chong, and Cecilia Demergasso. "Organotrophic and Mixotrofic Sulfur Oxidation in an Acidic Salt Flat in Northern Chile." Advanced Materials Research 1130 (November 2015): 63–66. http://dx.doi.org/10.4028/www.scientific.net/amr.1130.63.

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To understand the microbial community inhabiting in an acidic salt flat the phylogenetic diversity and the geochemistry of this system was compared to acid mine drainage (AMD) systems. The microbial community structure was assessed by DNA extraction/PCR/DGGE and secuencing for the 16S rRNA gene and the geochemistry was analyzed using several approaches. Prediction of metagenome functional content was performed from the 16S rRNA gene survey using the bioinformatics software package Phylogenetic Investigation of Communities by Reconstruction of Unobserved States (PICRUSt). The geochemical result

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Bellenberg, Sören, Dieu Huynh, Laura Castro, Maria Boretska, Wolfgang Sand, and Mario Vera. "Reactive Oxygen Species Influence Biofilm Formation of Acidophilic Mineral-Oxidizing Bacteria on Pyrite." Advanced Materials Research 1130 (November 2015): 118–22. http://dx.doi.org/10.4028/www.scientific.net/amr.1130.118.

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Reactive oxygen species (ROS), such as hydrogen peroxide (H2O2), superoxide (O2-) and hydroxyl radicals (OH.) are known to be formed on the surface of metal sulfides in aqueous solution under oxic and anoxic conditions. Consequently bacteria which have not been adapted to their presence are metabolically inhibited [1], presumably due to the presence of these ROS. Pyrite-grown cells ofAcidithiobacillus ferrooxidansT, in contrast to iron (II)-grown cells, were able to oxidize iron (II)-ions or pyrite after 24 h starvation and contact with 1 mM externally added H2O2. In this study, similar result

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Lu, Shipeng, Stefan Gischkat, Marco Reiche, Denise M. Akob, Kevin B. Hallberg, and Kirsten Küsel. "Ecophysiology of Fe-Cycling Bacteria in Acidic Sediments." Applied and Environmental Microbiology 76, no. 24 (2010): 8174–83. http://dx.doi.org/10.1128/aem.01931-10.

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ABSTRACT Using a combination of cultivation-dependent and -independent methods, this study aimed to elucidate the diversity of microorganisms involved in iron cycling and to resolve their in situ functional links in sediments of an acidic lignite mine lake. Using six different media with pH values ranging from 2.5 to 4.3, 117 isolates were obtained that grouped into 38 different strains, including 27 putative new species with respect to the closest characterized strains. Among the isolated strains, 22 strains were able to oxidize Fe(II), 34 were able to reduce Fe(III) in schwertmannite, the do

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Huynh, Dieu, Stefan Kaschabek, Wolfgang Sand, and Michael Schlömann. "Microorganisms Oxidize Iron (II) Ions in the Presence of High Concentrations of Sodium Chloride - Potentially Useful for Bioleaching." Solid State Phenomena 262 (August 2017): 364–67. http://dx.doi.org/10.4028/www.scientific.net/ssp.262.364.

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Acidophilic leaching microorganisms have been reported to be in general intolerant to high salinity, namely high concentrations of chloride. At present this restriction hampers the use of sea water for bioleaching technology. Enrichment cultures obtained in this study from a former ore deposit near the Spanish coast oxidize ferrous iron in the presence of up to 50 gL-1 NaCl at pH 2.5 and 37°C. The presence of at least 5 gL-1 NaCl was shown to be an obligate requirement for iron oxidation. The major microbial groups comprise Alicyclobacillus and Arthrobacter. The findings may be of biotechnolog

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Blöthe, Marco, Denise M. Akob, Joel E. Kostka, Kathrin Göschel, Harold L. Drake, and Kirsten Küsel. "pH Gradient-Induced Heterogeneity of Fe(III)-Reducing Microorganisms in Coal Mining-Associated Lake Sediments." Applied and Environmental Microbiology 74, no. 4 (2007): 1019–29. http://dx.doi.org/10.1128/aem.01194-07.

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ABSTRACT Lakes formed because of coal mining are characterized by low pH and high concentrations of Fe(II) and sulfate. The anoxic sediment is often separated into an upper acidic zone (pH 3; zone I) with large amounts of reactive iron and a deeper slightly acidic zone (pH 5.5; zone III) with smaller amounts of iron. In this study, the impact of pH on the Fe(III)-reducing activities in both of these sediment zones was investigated, and molecular analyses that elucidated the sediment microbial diversity were performed. Fe(II) was formed in zone I and III sediment microcosms at rates that were a

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Lefimil, C., Hector Osorio, Raquel Quatrini, David S. Holmes, and Eugenia Jedlicki. "Regulation of Expression of the PetI Operon Involved in Iron Oxidation in the Biomining Bacterium Acidithiobacillus Ferrooxidans." Advanced Materials Research 71-73 (May 2009): 199–202. http://dx.doi.org/10.4028/www.scientific.net/amr.71-73.199.

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Acidithiobacillus ferrooxidans is an acidophilic, chemolithotrophic bacterium that can gain energy and electrons by the oxidation of iron. PetI is an operon that encodes electron transport proteins involved in the reverse flow of electrons from iron to the NAD complex during iron oxidation. Although a substantial body of evidence describes the components and pathways for iron oxidation, little is known about their regulation. It is proposed that environmental iron concentrations and oxygen levels could influence the ability of A. ferrooxidans to oxidize iron as an energy source. We report init

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Liu, Ya Jie, Jiang Li, Yi Peng Zhou, et al. "Iron Oxidized Acidophiles Distribution and Activities in an Uranium In Situ Bioleaching Site." Advanced Materials Research 1130 (November 2015): 287–90. http://dx.doi.org/10.4028/www.scientific.net/amr.1130.287.

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Iron oxidized acidophlies are important in uranium extraction for it mainly depends on the indirect mechanism of bioleaching. Taking indirect field In-Situ bioleaching experiment in a uranium deposit as an example, several strains of acidophiles were isolated from the acid leachate. Bacteria compositions of the samples taken different stages were analyzed by 16SrDNA PCR-RFLP method. Results showed that the dominant bacteria in the leachate were Acidithiobacillus.ferrivorans,At.ferrooxidans and Leptospirrilum. ferrooxidans from the beginning to the middle stage of bioleaching process. With the

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., Nurseha, and Gunawan Djajakirana. "Isolation and Activity Test of Acidophilic Iron and Sulfur Oxidizing Bacteria from Black Water Ecosystem of Central Kalimantan." Jurnal Ilmu Tanah dan Lingkungan 6, no. 2 (2004): 51–56. http://dx.doi.org/10.29244/jitl.6.2.51-56.

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The acidophilic iron and sulfur oxidizing bacteria were isolatedfrom black water ecosystem, an 'extreme' ecosystemaffected indirect or directly by peat land Isolation and selection were done on minimal media (liquid and solid). All selectedstrain of bacteria (BB 179, OM 349, AH 41, TB 23, TB 27, TP 3, NN 323, and SI 188) were identified as Thiohacillusferrooxidans. Biooxidation and bio-leaching tests were accomplished using the isolated bacteria. The results showed thecapability of the isolated bacteria to oxidize ferrous-salt and to leach the low qualities of sulfide ores.

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Liljeqvist, Maria, Olena I. Rzhepishevska, and Mark Dopson. "Gene Identification and Substrate Regulation Provide Insights into Sulfur Accumulation during Bioleaching with the Psychrotolerant Acidophile Acidithiobacillus ferrivorans." Applied and Environmental Microbiology 79, no. 3 (2012): 951–57. http://dx.doi.org/10.1128/aem.02989-12.

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ABSTRACTThe psychrotolerant acidophileAcidithiobacillus ferrivoranshas been identified from cold environments and has been shown to use ferrous iron and inorganic sulfur compounds as its energy sources. A bioinformatic evaluation presented in this study suggested thatAcidithiobacillus ferrivoransutilized a ferrous iron oxidation pathway similar to that of the related speciesAcidithiobacillus ferrooxidans. However, the inorganic sulfur oxidation pathway was less clear, since theAcidithiobacillus ferrivoransgenome contained genes from bothAcidithiobacillus ferrooxidansandAcidithiobacillus caldus

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Amouric, A., C. Appia-Ayme, A. Yarzabal, and Violaine Bonnefoy. "Regulation of the Iron and Sulfur Oxidation Pathways in the Acidophilic Acidithiobacillus Ferrooxidans." Advanced Materials Research 71-73 (May 2009): 163–66. http://dx.doi.org/10.4028/www.scientific.net/amr.71-73.163.

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The acidophilic and strictly chemolithoautotrophic bacterium Acidithiobacillus ferrooxidans oxidizes ferrous (Fe(II)) to ferric (Fe(III)) iron and reduced inorganic sulfur compounds (RISC) to sulfuric acid, in oxic conditions. The redox proteins involved in the electron transfer between Fe(II) and oxygen are encoded in the same transcriptional unit, the rus operon. The expression of this operon is induced in the presence of Fe(II), but not Fe(III), and is not repressed in the presence of sulfur (S0). A number of genes differentially expressed in iron or sulfur conditions have been identified b

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Cleaver, Adam A., Nicolas P. Burton, and Paul R. Norris. "A Novel Acidimicrobium Species in Continuous Cultures of Moderately Thermophilic, Mineral-Sulfide-Oxidizing Acidophiles." Applied and Environmental Microbiology 73, no. 13 (2007): 4294–99. http://dx.doi.org/10.1128/aem.02658-06.

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ABSTRACT A novel species of Acidimicrobium appeared to be the predominant ferrous iron oxidizer in a mixed culture that effected the continuous, efficient extraction of nickel from a mineral concentrate at 49°C, but it was not isolated in pure culture. It outcompeted Acidimicrobium ferrooxidans, which was expected to have a major role in iron oxidation in reactors gassed with air, and was outnumbered at 49°C only by the sulfur-oxidizing Acidithiobacillus caldus. Sulfobacillus species were expected to compete with Acidimicrobium species when culture aeration was enriched with carbon dioxide, bu

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Patel, Mitesh J., Devayani R. Tipre, and Shailesh R. Dave. "Characterization and environmental impact of heterotrophic acidophilic thermotolerant iron oxidizer, isolated from Rajpardi lignite mine, India." Journal of Biotechnology 136 (October 2008): S633. http://dx.doi.org/10.1016/j.jbiotec.2008.07.1467.

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Cruz Viggi, Carolina, Francesca Pagnanelli, Matteo Sabattini, and Luigi Toro. "Inhibition of Iron Oxidizing Bacteria Involved in the Generation of Acid Mine Drainage." Advanced Materials Research 71-73 (May 2009): 681–84. http://dx.doi.org/10.4028/www.scientific.net/amr.71-73.681.

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Obligate autotrophic and acidophilic characteristics of iron oxidizing bacteria were exploited to prevent or attenuate the generation of AMD. Inhibition of iron oxidizing bacteria growth was performed by variation of growth medium by increasing pyrite concentration (substrate inhibition), by addition of limestone (inhibition by pH increase) and olive pomace (inhibition by organic compounds). Preliminary pyrite bioleaching tests showed the ability of the available inoculum to oxidize the mineral. Inhibition tests of batch growth were performed according to full factorial design with three facto

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Mathur, Jayanti, Richard W. Bizzoco, Dean G. Ellis, et al. "Effects of Abiotic Factors on the Phylogenetic Diversity of Bacterial Communities in Acidic Thermal Springs." Applied and Environmental Microbiology 73, no. 8 (2007): 2612–23. http://dx.doi.org/10.1128/aem.02567-06.

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ABSTRACT Acidic thermal springs offer ideal environments for studying processes underlying extremophile microbial diversity. We used a carefully designed comparative analysis of acidic thermal springs in Yellowstone National Park to determine how abiotic factors (chemistry and temperature) shape acidophile microbial communities. Small-subunit rRNA gene sequences were PCR amplified, cloned, and sequenced, by using evolutionarily conserved bacterium-specific primers, directly from environmental DNA extracted from Amphitheater Springs and Roaring Mountain sediment samples. Energy-dispersive X-ray

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Sagdieva, M. G., S. I. Borminskiy, Z. E. Rakhmatullaeva, A. K. Tonkikh, K. S. Sanakulov, and B. Scott. "Biohydrometallurgical Processing of Flotation Tailings from Different Copper Mills." Advanced Materials Research 20-21 (July 2007): 299–303. http://dx.doi.org/10.4028/www.scientific.net/amr.20-21.299.

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Two copper flotation tailings samples, one from the Almalyk Mining and Metallurgical Complex, Uzbekistan (sample designated AMMC) and the other from Whitehorse (WT), Yukon, Canada, were bioleached at laboratory scale. Acidophilic, iron- and sulphur-oxidizing cultures were enriched from the two tailings and these cultures were used for the testing. After 24 weeks of bioleaching in percolator columns 70-72% of the copper was leached from the AMMC tailings and 91-93% of the copper was leached from the WT tailings. The chalcopyritic nature of the copper and larger particle size of the AMMC tailing

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Nancucheo, Ivan, Guilherme Oliveira, Manoel Lopes, and David Johnson. "Bioreductive Dissolution as a Pretreatment for Recalcitrant Rare-Earth Phosphate Minerals Associated with Lateritic Ores." Minerals 9, no. 3 (2019): 136. http://dx.doi.org/10.3390/min9030136.

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Recent research has demonstrated the applicability of a biotechnological approach for extracting base metals using acidophilic bacteria that catalyze the reductive dissolution of ferric iron oxides from oxidized ores, using elemental sulfur as an electron donor. In Brazil, lateritic deposits are frequently associated with phosphate minerals such as monazite, which is one of the most abundant rare-earth phosphate minerals. Given the fact that monazite is highly refractory, rare earth elements (REE) extraction is very difficult to achieve and conventionally involves digesting with concentrated s

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Amouric, Agnès, Céline Brochier-Armanet, D. Barrie Johnson, Violaine Bonnefoy, and Kevin B. Hallberg. "Phylogenetic and genetic variation among Fe(II)-oxidizing acidithiobacilli supports the view that these comprise multiple species with different ferrous iron oxidation pathways." Microbiology 157, no. 1 (2011): 111–22. http://dx.doi.org/10.1099/mic.0.044537-0.

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Autotrophic acidophilic iron- and sulfur-oxidizing bacteria of the genus Acidithiobacillus constitute a heterogeneous taxon encompassing a high degree of diversity at the phylogenetic and genetic levels, though currently only two species are recognized (Acidithiobacillus ferrooxidans and Acidithiobacillus ferrivorans). One of the major functional disparities concerns the biochemical mechanisms of iron and sulfur oxidation, with discrepancies reported in the literature concerning the genes and proteins involved in these processes. These include two types of high-potential iron–sulfur proteins (

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Ňancucheo, I., S. Hedrich, and D. B. Johnson. "New microbiological strategies that enable the selective recovery and recycling of metals from acid mine drainage and mine process waters." Mineralogical Magazine 76, no. 7 (2012): 2683–92. http://dx.doi.org/10.1180/minmag.2012.076.7.04.

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AbstractApproaches currently used for remediating acid mine drainage (chiefly active chemical treatment and passive bioremediation systems) have a number of major detractions, including their failure to recover potentially valuable metals from these waters. Bioremediation strategies that utilize reactor-housed microorganisms can circumvent this problem, but have tended not to be widely used due to their relatively high costs. We have devised innovative approaches for remediating mine waters that use acidophilic bacteria to remove metals either as oxidized or reduced phases, using modular biore

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Sheng, Yizhi, Kyle Bibby, Christen Grettenberger, et al. "Geochemical and Temporal Influences on the Enrichment of Acidophilic Iron-Oxidizing Bacterial Communities." Applied and Environmental Microbiology 82, no. 12 (2016): 3611–21. http://dx.doi.org/10.1128/aem.00917-16.

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ABSTRACTTwo acid mine drainage (AMD) sites in the Appalachian bituminous coal basin were selected to enrich for Fe(II)-oxidizing microbes and measure rates of low-pH Fe(II) oxidation in chemostatic bioreactors. Microbial communities were enriched for 74 to 128 days in fed-batch mode, then switched to flowthrough mode (additional 52 to 138 d) to measure rates of Fe(II) oxidation as a function of pH (2.1 to 4.2) and influent Fe(II) concentration (80 to 2,400 mg/liter). Biofilm samples were collected throughout these operations, and the microbial community structure was analyzed to evaluate impac

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Hallberg, Kevin B., Sabrina Hedrich, and D. Barrie Johnson. "Acidiferrobacter thiooxydans, gen. nov. sp. nov.; an acidophilic, thermo-tolerant, facultatively anaerobic iron- and sulfur-oxidizer of the family Ectothiorhodospiraceae." Extremophiles 15, no. 2 (2011): 271–79. http://dx.doi.org/10.1007/s00792-011-0359-2.

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Okibe, Naoko, Shiori Morishita, Masahito Tanaka, Tsuyoshi Hirajima, and Keiko Sasaki. "Effect of Cu(II) on Bio-Scorodite Crystallization Using Acidianus brierleyi." Advanced Materials Research 1130 (November 2015): 101–4. http://dx.doi.org/10.4028/www.scientific.net/amr.1130.101.

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The effect of different concentrations of Cu (II) on microbial scorodite (FeAsO4⋅2H2O) formation was investigated by using thermo-acidophilic iron-oxidizing archaeon, Acidianus brierleyi. In the presence of 8-16 mM Cu (II) microbial Fe (II) oxidation and cell growth was only marginal. Its As (III) oxidation ability was especially severely inhibited by the presence of Cu (II), consequently disabling scorodite formation. However, when scorodite seed crystals were fed, Ac. brierleyi readily oxidized Fe (II) and As (III) even in the presence of 8.0 mM Cu (II), forming crystalline scorodite within

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Küsel, Kirsten, Tanja Dorsch, Georg Acker, and Erko Stackebrandt. "Microbial Reduction of Fe(III) in Acidic Sediments: Isolation of Acidiphilium cryptum JF-5 Capable of Coupling the Reduction of Fe(III) to the Oxidation of Glucose." Applied and Environmental Microbiology 65, no. 8 (1999): 3633–40. http://dx.doi.org/10.1128/aem.65.8.3633-3640.1999.

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ABSTRACT To evaluate the microbial populations involved in the reduction of Fe(III) in an acidic, iron-rich sediment, the anaerobic flow of supplemental carbon and reductant was evaluated in sediment microcosms at the in situ temperature of 12°C. Supplemental glucose and cellobiose stimulated the formation of Fe(II); 42 and 21% of the reducing equivalents that were theoretically obtained from glucose and cellobiose, respectively, were recovered in Fe(II). Likewise, supplemental H2 was consumed by acidic sediments and yielded additional amounts of Fe(II) in a ratio of approximately 1:2. In cont

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Navarrete, Jesica U., Ian J. Cappelle, Kimberlin Schnittker, and David M. Borrok. "Bioleaching of ilmenite and basalt in the presence of iron-oxidizing and iron-scavenging bacteria." International Journal of Astrobiology 12, no. 2 (2012): 123–34. http://dx.doi.org/10.1017/s1473550412000493.

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AbstractBioleaching has been suggested as an alternative to traditional mining techniques in extraterrestrial environments because it does not require extensive infrastructure and bulky hardware. In situ bioleaching of silicate minerals, such as those found on the moon or Mars, has been proposed as a feasible alternative to traditional extraction techniques that require either extreme heat and/or substantial chemical treatment. In this study, we investigated the biotic and abiotic leaching of basaltic rocks (analogues to those found on the moon and Mars) and the mineral ilmenite (FeTiO3) in aq

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Akob, Denise M., Michelle Hallenbeck, Felix Beulig, et al. "Mixotrophic Iron-Oxidizing Thiomonas Isolates from an Acid Mine Drainage-Affected Creek." Applied and Environmental Microbiology 86, no. 24 (2020). http://dx.doi.org/10.1128/aem.01424-20.

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ABSTRACT Natural attenuation of heavy metals occurs via coupled microbial iron cycling and metal precipitation in creeks impacted by acid mine drainage (AMD). Here, we describe the isolation, characterization, and genomic sequencing of two iron-oxidizing bacteria (FeOB) species: Thiomonas ferrovorans FB-6 and Thiomonas metallidurans FB-Cd, isolated from slightly acidic (pH 6.3), Fe-rich, AMD-impacted creek sediments. These strains precipitated amorphous iron oxides, lepidocrocite, goethite, and magnetite or maghemite and grew at a pH optimum of 5.5. While Thiomonas spp. are known as mixotrophi

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Christel, Stephan, Malte Herold, Sören Bellenberg, et al. "Multi-omics Reveals the Lifestyle of the Acidophilic, Mineral-Oxidizing Model Species Leptospirillum ferriphilum T." Applied and Environmental Microbiology 84, no. 3 (2017). http://dx.doi.org/10.1128/aem.02091-17.

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ABSTRACT Leptospirillum ferriphilum plays a major role in acidic, metal-rich environments, where it represents one of the most prevalent iron oxidizers. These milieus include acid rock and mine drainage as well as biomining operations. Despite its perceived importance, no complete genome sequence of the type strain of this model species is available, limiting the possibilities to investigate the strategies and adaptations that Leptospirillum ferriphilum DSM 14647 T (here referred to as Leptospirillum ferriphilum T ) applies to survive and compete in its niche. This study presents a complete, c

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Degli Esposti, Mauro, Ana Moya-Beltrán, Raquel Quatrini, and Lars Hederstedt. "Respiratory Heme A-Containing Oxidases Originated in the Ancestors of Iron-Oxidizing Bacteria." Frontiers in Microbiology 12 (June 15, 2021). http://dx.doi.org/10.3389/fmicb.2021.664216.

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Respiration is a major trait shaping the biology of many environments. Cytochrome oxidase containing heme A (COX) is a common terminal oxidase in aerobic bacteria and is the only one in mammalian mitochondria. The synthesis of heme A is catalyzed by heme A synthase (CtaA/Cox15), an enzyme that most likely coevolved with COX. The evolutionary origin of COX in bacteria has remained unknown. Using extensive sequence and phylogenetic analysis, we show that the ancestral type of heme A synthases is present in iron-oxidizing Proteobacteria such as Acidithiobacillus spp. These bacteria also contain a

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Thacker, Shital C., Nisha S. Nayak, Devayani R. Tipre, and Shailesh R. Dave. "Multi-Metal Mining from Waste Cell Phone Printed Circuit Boards using Lixiviant Produced by a Consortium of Acidophilic Iron Oxidizers." Environmental Engineering Science, August 27, 2021. http://dx.doi.org/10.1089/ees.2020.0389.

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