The process of oxygenic photosynthesis is robust and ubiquitous, relying centrally on input of light, carbon dioxide, and water, which in many environments are all abundantly available, and from which are produced, principally, oxygen and reduced organic carbon. However, photosynthetic machinery can be conflicted by the simultaneous presence of carbon dioxide and oxygen through a process someti...

Staphylothermus marinus Fiala and Stetter 1986 belongs to the order Desulfurococcales within the archaeal phylum Crenarchaeota. S. marinus is a hyperthermophilic, sulfur-dependent, anaerobic heterotroph. Strain F1 was isolated from geothermally heated sediments at Vulcano, Italy, but S. marinus has also been isolated from a hydrothermal vent on the East Pacific Rise. We report the complete geno...

The microbially mediated recovery of valuable metals contained in mining waste presents an economical alternative to conventional hydrometallurgical processes. In order investigate the effect bacterial adaptation and biological oxidation on bioleaching, bioleaching a pyrrhotite sample from mine waste, with indigenous bacteria existing acid drainage, was studied. were sub-cultured repeatedly for...

Although microbes directly accepting electrons from a cathode have been applied for CO2 reduction to produce multicarbon-compounds, a high electron demand and low product concentration are critical limitations. Alternatively, the utilization of electrons as a co-reducing power during fermentation has been attempted, but there must be exogenous mediators due to the lack of an electroactive heter...

Mining has advanced primarily through the use of two strategies: pyrometallurgy and hydrometallurgy. Both have been used successfully to extract valuable metals from ore deposits. These strategies, without a doubt, harm environment. Furthermore, due decades excessive mining, there global decline in high-grade ores. This resulted decrease metal supply, which prompted reconsideration these tradit...

the term biomining have been coined to refer to the use of microorganisms in mining processes as in the biooxidation of refractory gold minerals. the biooxidation of refractory gold ores presents similar characteristics when compared with roasting and pressure oxidation. almost without exception, microbial extraction procedures are more environmentally friendly. the isolated bacteria in this st...

Bioleaching is a proven bioprocess for metal recovery by solution from solid matrices, while a bioprecipitation or biomineralization approach is of potential for biorecovery from solution. Fungi can directly and indirectly mediate the formation of many kinds of minerals, including oxides, phosphates, carbonates and oxalates, as well as elemental forms of metals and metalloids such as Ag, Se and...

Abstract Interest in low-grade Ni-laterite ores has increased recent years; however, the laterite process proven technically difficult and costly, development of alternative low-cost biotechnologies for Ni solubilization been encouraged. In this context, first time, a sample Brazilian ore was subjected to microbial bioleaching using heterotrophic Burkholderia sp. strain. Experiments were perfor...

Ferric ion is a strength oxidant and its precipitation is an undesired phenomenon in the bioleaching process. Previous studies showed that it considerably occurs in bioleaching operations even at optimum conditions. Although there have been many reports on the Fe3+ precipitation, no study has made a mathematical modeling of the affecting parameters. The aim of the present work is the developmen...