Effects of temperature on the rates of iron and sulfur oxidation by selected bioleaching Bacteria and Archaea: Application of the Ratkowsky equation

Franzmann, P.D.; Haddad, Christina; Hawkes, Rebecca; Robertson, Wendy; Plumb, Jason J.

doi:10.1016/j.mineng.2005.04.006

Cited by 107 publications

(51 citation statements)

References 25 publications

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“…Our results showed that the AtGroEL ATPase activity was temperature-dependent, and the AtGroEL had an optimal ATPase activity at 50°C, which maybe above the maximum temperature for growth of the bioleaching microorganisms, especially for At. ferrooxidans (Franzmann et al 2005). The results suggest that AtGroEL might have an increased activity under stressful conditions, e.g.…”

Section: Discussionmentioning

confidence: 81%

Expression and function of two chaperone proteins, AtGroEL and AtGroES, from Acidithiobacillus ferrooxidans ATCC 23270

Qin

Huang

Zhu

et al. 2011

World J Microbiol Biotechnol

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Two molecular chaperone genes encoding the Acidithiobacillus ferrooxidans Hsp60 (AtGroEL) and Hsp10 (AtGroES), respectively were introduced into Escherichia coli using the pLM1 expression vector. Then the AtGroEL and AtGroES proteins were overexpressed successfully in Escherichia coli BL21 (DE3), and purified by one-step immobilized metal affinity chromatography. The ATPase assay showed that the proteins were in active form, and the ATPase activity of AtGroEL was temperature dependent with an optimal temperature of 50°C, but the co-chaperonin AtGroES inhibited the ATPase activity of AtGroEL. The chaperonin function of the recombinant proteins was examined using three different protein substrates in vitro, and the results showed that AtGroEL/AtGroES chaperone system could facilitate the refolding of the thermodenatured rusticyanin and recover the activity of thermodenatured ArsH protein. In addition, it could improve the thermal stability of xylanase. Molecular modelling for AtGroEL protein revealed that residues of Tyr199, Ser201, Tyr203, Phe204, Leu234, Leu237, Leu259, Val263 and Val264 were necessary for binding the denatured polypeptides.

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Section: Discussionmentioning

confidence: 81%

Expression and function of two chaperone proteins, AtGroEL and AtGroES, from Acidithiobacillus ferrooxidans ATCC 23270

Qin

Huang

Zhu

et al. 2011

World J Microbiol Biotechnol

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“…Figure 2) and be influenced by both temperature and N/S ratio changes when HS -(sulfur reduced compound) is available (Sposob et al, 2017b(Sposob et al, , 2016. The observation that S 0 leaching increases with temperature (Franzmann et al, 2005) should also be accounted for in the further model development.…”

Section: N/s Ratiomentioning

confidence: 98%

“…It can therefore be useful to develop the model further to better account for accumulation and consumption of S 0 . Some relevant information is available, such as: kinetics for S 0 leaching and usage as electron donor is available (Franzmann et al, 2005;Gourdon and Funtowicz, 1998;Koenig and Liu, 2001). Models including similar accumulation phenomena related to energy storage are developed, i.e.…”

Section: N/s Ratiomentioning

confidence: 99%

Modeling N/S ratio and temperature effects in simultaneous biological denitrification and sulfide oxidation

Sposób

Bakke

Dinamarca

2017

Linköping Electronic Conference Proceedings

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A model describing the simultaneous removal of NO3 Elemental sulfur production is included in the mathematical model, however, its accumulation and release (as SO4 2-) with increasing feed N/S ratio (e.g. leading to higher effluent than feed total sulfur mass at N/S = 1.30) is not simulated. A conceptual model to account for biological accumulation and release of elemental sulfur is proposed here.

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“…7, se muestra el incremento de los valores del potencial redox de 4 a 24 días, aumentando de 314 a 576,3 mV (Fig. 7a) con el menor tamaño del mineral con la mayor recuperación de cobre, indicando una buena actividad bacteriana y una biolixiviación eficiente según Franzmann et al (2005).…”

Section: Efectos Del Tamaño De Partícula En Biolixiviación Y Lixiviacunclassified

Biolixiviación de mineral cuarzo por <em>Acidithiobacillus ferrooxidans</em> en reactor de columna por gravedad

et al. 2017

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RESUMEN:La biolixiviación es el proceso mediante el cual se extrae cobre de minerales sulfuros de baja ley usando microorganismos. La lixiviación química se aplica preferentemente para extraer cobre de minerales oxidados o mixtos, pero no existe información de aplicación de microorganismos en esta operación. En tal sentido, en la presente investigación se trabajó con reactores en columna por gravedad para procesos de lixiviación química, con cultivos bacterianos de Acidithiobacillus ferrooxidans en medio 9K y mineral de cuarzo que contenía cuprita y pirita, con diferentes tamaños de partícula. Se encontró que después de 24 días de lixiviación química se recuperó el 86% de cobre cuando se incluyeron bacterias, mientras que sin ellas sólo se recuperó el 54%. La mayor recuperación de cobre en ambos procesos se obtuvo en el siguiente orden de acuerdo al tamaño de partícula: 9,5 mm > 12,5 mm > 19,05 mm. Así, la aplicación de células bacterianas a procesos lixiviación química con minerales oxidados de cobre que incluyen cuarzo y células de A. ferrooxidans, aumenta la recuperación de cobre cuanto menor sea el tamaño de partícula del mineral. Esta tecnología puede ser utilizada por empresas mineras que aún siguen realizando lixiviación química convencional y se puede incluir en la operación la adición de microorganismos para aumentar la recuperación de cobre de minerales sulfurados incluyendo cuarzo. ABSTRACT: Quartz mineral bioleaching by Acidithiobacillus ferrooxidans in gravity column reactor. Bioleaching is the process by which copper is extracted from low-sulfur minerals using microorganisms. However, chemical leaching is preferably applied to extract copper from oxidized or mixed minerals, without reports of application of microorganisms in this operation. In this work, we investigated the presence of Acidithiobacillus ferrooxidans in 9K medium and quartz mineral, with quartz sandstone, cuprite and pyrite at different particle sizes. It was found that at 24 days of the chemical leaching process 86% of copper was recovered when bacteria were included and only 54% recovered without them. The highest copper recovery in both processes was obtained in the following order according to the particle size: 9.5 mm > 12.5 mm > 19.05

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Effects of temperature on the rates of iron and sulfur oxidation by selected bioleaching Bacteria and Archaea: Application of the Ratkowsky equation

Cited by 107 publications

References 25 publications

Expression and function of two chaperone proteins, AtGroEL and AtGroES, from Acidithiobacillus ferrooxidans ATCC 23270

Expression and function of two chaperone proteins, AtGroEL and AtGroES, from Acidithiobacillus ferrooxidans ATCC 23270

Modeling N/S ratio and temperature effects in simultaneous biological denitrification and sulfide oxidation

Biolixiviación de mineral cuarzo por <em>Acidithiobacillus ferrooxidans</em> en reactor de columna por gravedad

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