1
|
Fatemi F, Miri S, Jahani S. Effect of metal sulfide pulp density on gene expression of electron transporters in Acidithiobacillus sp. FJ2. Arch Microbiol 2016; 199:521-530. [PMID: 27885407 DOI: 10.1007/s00203-016-1318-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2016] [Revised: 10/21/2016] [Accepted: 11/04/2016] [Indexed: 11/30/2022]
Abstract
In Acidithiobacillus ferrooxidans, one of the most important bioleaching bacterial species, the proteins encoded by the rus operon are involved in the electron transfer from Fe2+ to O2. To obtain further knowledge about the mechanism(s) involved in the adaptive responses of the bacteria to growth on the different uranium ore pulp densities, we analyzed the expression of the four genes from the rus operon by real-time PCR, when Acidithiobacillus sp. FJ2 was grown in the presence of different uranium concentrations. The uranium bioleaching results showed the inhibitory effects of the metal pulp densities on the oxidation activity of the bacteria which can affect Eh, pH, Fe oxidation and uranium extractions. Gene expression analysis indicated that Acidithiobacillus sp. FJ2 tries to survive in the stress with increasing in the expression levels of cyc2, cyc1, rus and coxB, but the metal toxicity has a negative effect on the gene expression in different pulp densities. These results indicated that Acidithiobacillus sp. FJ2 could leach the uranium even in high pulp density (50%) by modulation in rus operon gene responses.
Collapse
Affiliation(s)
- Faezeh Fatemi
- Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute, Tehran, Iran.
| | - Saba Miri
- Department of Biotechnology, Faculty of Life Science, Alzahra University, Tehran, Iran
| | - Samaneh Jahani
- Department of Microbiology, Faculty of Science, Qom Branch, Islamic Azad University, Qom, Iran
| |
Collapse
|
2
|
Jeremic S, Beškoski VP, Djokic L, Vasiljevic B, Vrvić MM, Avdalović J, Gojgić Cvijović G, Beškoski LS, Nikodinovic-Runic J. Interactions of the metal tolerant heterotrophic microorganisms and iron oxidizing autotrophic bacteria from sulphidic mine environment during bioleaching experiments. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2016; 172:151-161. [PMID: 26942859 DOI: 10.1016/j.jenvman.2016.02.041] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2016] [Revised: 02/19/2016] [Accepted: 02/22/2016] [Indexed: 06/05/2023]
Abstract
Iron and sulfur oxidizing chemolithoautotrophic acidophilic bacteria, such as Acidithiobacillus species, hold the dominant role in mine environments characterized by low pH values and high concentrations of reduced sulfur and iron compounds, such as ores, rocks and acid drainage waters from mines. On the other hand, heterotrophic microorganisms, especially their biofilms, from these specific niches are receiving increased attention, but their potential eco-physiological roles have not been fully understood. Biofilms are considered a threat to human health, but biofilms also have beneficial properties as they are deployed in waste recycling and bioremediation systems. We have analyzed interactions of the metal tolerant heterotrophic microorganisms in biofilms with iron oxidizing autotrophic bacteria both from the sulphidic mine environment (copper mine Bor, Serbia). High tolerance to Cu(2+), Cd(2+) and Cr(6+) and the presence of genetic determinants for the respective metal tolerance and biofilm-forming ability was shown for indigenous heterotrophic bacteria that included strains of Staphylococcus and Rhodococcus. Two well characterized bacteria- Pseudomonas aeruginosa PAO1 (known biofilm former) and Cupriavidus metallidurans CH34 (known metal resistant representative) were also included in the study. The interaction and survivability of autotrophic iron oxidizing Acidithiobacillus bacteria and biofilms of heterotrophic bacteria during co-cultivation was revealed. Finally, the effect of heterotrophic biofilms on bioleaching process with indigenous iron oxidizing Acidithiobacillus species was shown not to be inhibitory under in vitro conditions.
Collapse
Affiliation(s)
- Sanja Jeremic
- Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, P.O. Box 23, 11010 Belgrade, Serbia
| | - Vladimir P Beškoski
- Faculty of Chemistry, University of Belgrade, P.O. Box 51, 11158 Belgrade, Serbia.
| | - Lidija Djokic
- Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, P.O. Box 23, 11010 Belgrade, Serbia
| | - Branka Vasiljevic
- Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, P.O. Box 23, 11010 Belgrade, Serbia
| | - Miroslav M Vrvić
- Faculty of Chemistry, University of Belgrade, P.O. Box 51, 11158 Belgrade, Serbia
| | - Jelena Avdalović
- Department of Chemistry, Institute of Chemistry, Technology and Metallurgy, University of Belgrade, P.O. Box 473, 11001 Belgrade, Serbia
| | - Gordana Gojgić Cvijović
- Department of Chemistry, Institute of Chemistry, Technology and Metallurgy, University of Belgrade, P.O. Box 473, 11001 Belgrade, Serbia
| | | | - Jasmina Nikodinovic-Runic
- Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, P.O. Box 23, 11010 Belgrade, Serbia.
| |
Collapse
|
3
|
Wang Y, Li J, Zhai S, Wei Z, Feng J. Enhanced phosphorus removal by microbial-collaborating sponge iron. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2015; 72:1257-1265. [PMID: 26465294 DOI: 10.2166/wst.2015.323] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The collaborative and mutually reinforcing phosphorus removal in domestic wastewater in a sponge iron and microorganisms system was studied through a laboratory and a pilot scale experiment. The results showed that the total phosphorus concentration of the effluent of less than 0.5 mg/L could be achieved. The results also support that the biochemical reaction accelerated the iron electrochemical corrosion. As a driving force, iron bacteria strengthened the chemical oxidation of Fe(II) to Fe(III). The chemical precipitation of Fe(III) is the main form of phosphorus removal. In addition, there exists adsorption phosphorus removal by phosphate-accumulating organisms. The mechanism of the enhanced phosphorus removal by microbial-collaborating sponge iron was thus proposed.
Collapse
Affiliation(s)
- Ya'e Wang
- School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, China E-mail:
| | - Jie Li
- School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, China E-mail:
| | - Siyuan Zhai
- School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, China E-mail:
| | - Zhiyong Wei
- School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, China E-mail:
| | - Juanjuan Feng
- School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu, China E-mail:
| |
Collapse
|