Zobrazeno 1 - 10
of 22
pro vyhledávání: '"Maggy F. Lengke"'
Publikováno v:
Economic Geology. 111:1485-1494
A gold-bearing ore from the San Salvador vein, Capillitas mine, Argentina, was exposed to an enriched, iron- and sulfur-oxidizing bacterial consortium for two months in an experimental system that represented an oxidized, acid-leached weathering envi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::00c895cb6ba1df6756bcded0eb61eb84
https://doi.org/10.2113/econgeo.111.6.1485
https://doi.org/10.2113/econgeo.111.6.1485
Publikováno v:
Elements. 5:303-307
The biosphere catalyzes a variety of biogeochemical reactions that can transform gold. Microbial weathering contributes to the mobilization of gold by releasing elemental gold trapped within minerals and by solubilizing gold via oxidation-promoting c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::75f4c5210226a8e44fa5a07c4b94ee4b
https://doi.org/10.2113/gselements.5.5.303
https://doi.org/10.2113/gselements.5.5.303
Publikováno v:
The Canadian Mineralogist. 47:593-613
We provide a comprehensive review of research conducted on the dissolution–oxidation of As-bearing sulfides including arsenopyrite, orpiment, realgar, tennantite, and the amorphous forms of As2S3 and AsS. In general, a rise in pH and the presence o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f7790ba53687f2d2b3ea833333d09942
https://doi.org/10.3749/canmin.47.3.593
https://doi.org/10.3749/canmin.47.3.593
Autor:
Gregory Wanger, Michael E. Fleet, Gordon Southam, Bruce Ravel, Robert A. Gordon, Maggy F. Lengke
Publikováno v:
Canadian Journal of Chemistry. 85:651-659
The mechanisms of gold precipitation by the interaction of cyanobacteria (Plectonema boryanum UTEX 485) and gold(III) chloride aqueous solutions (7.6 mmol/L final gold) have been studied at 25, 60, and 80 °C, using both laboratory and real-time sync
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9c2b4e20cda2105682a6d7bfbc5dd78a
https://doi.org/10.1139/v07-024
https://doi.org/10.1139/v07-024
Publikováno v:
The ISME Journal. 1:567-584
Microorganisms capable of actively solubilizing and precipitating gold appear to play a larger role in the biogeochemical cycling of gold than previously believed. Recent research suggests that bacteria and archaea are involved in every step of the b
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a17f99ae9281b92aa3b32205bd0dd6ee
https://doi.org/10.1038/ismej.2007.75
https://doi.org/10.1038/ismej.2007.75
Publikováno v:
Langmuir. 23:8982-8987
The interaction of cyanobacterial biomass (Plectonema boryanum UTEX 485) with aqueous palladium(II) chloride (PdCl2 degrees ) has been investigated at 25-100 degrees C for up to 28 days. We report that the release of organic materials from the cyanob
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8be93d9fa74733f4f8333e129ea139d2
https://doi.org/10.1021/la7012446
https://doi.org/10.1021/la7012446
Autor:
Gordon Southam, Maggy F. Lengke
Publikováno v:
Economic Geology. 102:109-126
The role of sulfate-reducing bacteria in the precipitation of elemental gold through a geologic stratum was investigated using column experiments. The mixed culture, dominated by sulfate-reducing bacteria, was isolated from the Driefontein consolidat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::974af1bc292b992aa5e2214b18115c97
https://doi.org/10.2113/gsecongeo.102.1.109
https://doi.org/10.2113/gsecongeo.102.1.109
Publikováno v:
Geomicrobiology Journal. 23:591-597
Plectonema boryanum UTEX 485 was reacted with aqueous AuCl 4 − solutions ( ∼ 2 mM Au) at 25 to 100°C for 1 month, and 200°C for one day. Addition of AuCl4 − to cyanobacteria killed the cultures instantly, and Au was precipitated throughout th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a4fd926737f0c06eb7fc72f49f08b47d
https://doi.org/10.1080/01490450600964326
https://doi.org/10.1080/01490450600964326
Autor:
Robert A. Gordon, Michael E. Fleet, Gordon Southam, Bruce Ravel, Gregory Wanger, Maggy F. Lengke
Publikováno v:
Environmental Science & Technology. 40:6304-6309
The mechanisms of gold bioaccumulation by cyanobacteria (Plectonema boryanum UTEX 485) from gold(III)-chloride solutions have been studied at three gold concentrations (0.8,1.7, and 7.6 mM) at 25 degrees C, using both fixed-time laboratory and real-t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::741e08d72a4dfe1c9491524fb4c3ba5d
https://doi.org/10.1021/es061040r
https://doi.org/10.1021/es061040r
Autor:
Maggy F. Lengke, Gordon Southam
Publikováno v:
Geochimica et Cosmochimica Acta. 69:3759-3772
An Acidithiobacillus thiooxidans spp., isolated from the Driefontein Consolidated Gold Mine, Witwatersrand Basin, Republic of South Africa was able to precipitate gold from Au(S2O3)23− in the presence of up to 0.26 mM gold. In chemical control expe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::835a30ce86bbd5e89dd80e172489445e
https://doi.org/10.1016/j.gca.2005.03.012
https://doi.org/10.1016/j.gca.2005.03.012