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Jarosite pseudomorph formation from arsenopyrite oxidation using Acidithiobacillus ferrooxidans
(Elsevier B.V., 2010-09-01)
In this work, the oxidizing action of a native strain type A. ferrooxidans on a sulphide containing a predominance of arsenopyrite and pyrite has been evaluated. Incubation of the A. ferrooxidans strain in flasks containing ...
Jarosite pseudomorph formation from arsenopyrite oxidation using Acidithiobacillus ferrooxidans
(Elsevier B.V., 2010-09-01)
In this work, the oxidizing action of a native strain type A. ferrooxidans on a sulphide containing a predominance of arsenopyrite and pyrite has been evaluated. Incubation of the A. ferrooxidans strain in flasks containing ...
Exceptional cases of textile mineralization in archaeological metallic objects from Santiago del Estero's lowlands (Argentina)
(Elsevier Ltd, 2020-10)
Here, we present and discuss the results obtained from a series of techno-morphological and compositional analyses performed on two objects from the collection of the “Emilio and Duncan Wagner” Anthropology and Natural ...
Design of a LNA and a Gilbert Cell Mixer MMICs with a GaAs PHEMT technology
(1999-12-01)
The design of a Gilbert Cell Mixer and a low noise amplifier (LNA), using GaAs PHEMT technology is presented. The compatibility is shown for co-integration of both block on the same chip, to form a high performance 1.9 GHz ...
UM NOVO TIPO DE ESTRUTURA EM LAVAS ULTRAMÁFICAS: GREENSTONE BELT CRIXÁS, GOUM NOVO TIPO DE ESTRUTURA EM LAVAS ULTRAMÁFICAS: GREENSTONE BELT CRIXÁS, GO
(Sociedade Brasileira de Geologia, 2018)
Late Holocene hydrology inferred from lacustrine sediments of Laguna Cháltel (southeastern Argentina)
(Elsevier Science, 2014-07)
Hydrological changes that occurred during the last 4700 years have been reconstructed using multi-proxy analyses of sediment cores from the volcanic crater lake of Laguna Cháltel (50°S, 71°W). The chronology is based on ...