Results 181 to 190 of about 10,443 (220)

Microbiological leaching of a chalcopyrite concentrate by Thiobacillus ferrooxidans

Biotechnology and Bioengineering, 1976
AbstractThe microbiological leaching of a chalcopyrite concentrate has been investigated using a pure strain of Thiobacillus ferrooxidans. The optimum leaching conditions regarding pH, temperature, and pulp density were found to be 2.3, 35°C, and 22%, respectively. The energy of activation was calculated to be 16.7 kcal/mol.
Hiromichi Sakaguchi, Marvin Silver, Arpad E. Torma   +2 more
openaire   +2 more sources

Chalcopyrite bioleaching by A. ferrooxidans and surface passivation

2011 International Conference on Remote Sensing, Environment and Transportation Engineering, 2011
Based on the fact that the primary copper sulfide bioleaching has long leaching time and low leaching rate and has not been used in industry, through selective breeding, domesticated species leaching good using the scanning electron microscopy. The chalcopyrite bioleaching by A. ferrooxidans was studied.
null Guanghua Ai, null Xiuxiang Tao, null Xinyang Yu, Rongbo Shu   +3 more
openaire   +1 more source

Existence of a tungsten-binding protein in Acidithiobacillus ferrooxidans AP19-3

Journal of Bioscience and Bioengineering, 2004
A tungsten-binding protein was purified from a plasma membrane preparation of the iron-oxidizing bacterium, Acidithiobacillus ferrooxidans AP19-3 in an electrophoretically homogenous state. The protein was composed of two subunits with apparent molecular masses of 12 and 20.7 kDa. The molecular mass of the native protein was estimated to be 26.4 kDa in
Tsuyoshi, Sugio, Hiroyuki, Kuwano, Yoshiko, Hamago, Atsunori, Negishi, Terunobu, Maeda, Fumiaki, Takeuchi, Kazuo, Kamimura   +6 more
openaire   +2 more sources

A structured model forThiobacillus ferrooxidans growth on ferrous iron

Biotechnology and Bioengineering, 1997
A structured model for Thiobacillus ferrooxidans growth dependence on ferrous and ferric iron, arsenic, oxygen, carbon dioxide, pH, and temperature is presented. A new kinetic mechanism for ferrous oxidation by T. ferrooxidans is introduced. Data from several earlier experimental studies of T. ferroaxidans growth are used for model development.
openaire   +2 more sources

Cadmium Tolerance and Uptake by a Thiobacillus Ferrooxidans Biomass

Environmental Technology, 1997
A non-growing living biomass of the acidophilic bacterium Thiobacillus ferrooxidans exhibited a high cadmium uptake capacity dependent on pH, on the physiological state and on the nature of the biomass. Thus an uptake (0.21 g cadmium g−1 dry weight) was obtained at pH 1.6 with a non adapted cadmium biomass, harvested in the end of the exponential phase
F. Baillet, J. P. Magnin, A. Cheruy, P. Ozil   +3 more
openaire   +1 more source

A comparative study of characteristic properties ofThiobacillus ferrooxidans strains

Folia Microbiologica, 1992
Several cultures ofThiobacillus ferrooxidans were purified by isolation of single colonies and simple physiological and biochemical properties of the purified cultures, such as colony morphology, kinetics of ferrous ion oxidation, growth on elemental sulfur and thiosulfate, oxidation of ferrous ion by growing cells in the presence of organic compounds ...
S. Bhattacharyya, A. Das, B. K. Chakrabarti, P. C. Banerjee   +3 more
openaire   +1 more source

A trickle bed reactor for ferrous sulphate oxidation using Thiobacillus ferrooxidans

Biotechnology Techniques, 1994
A trickle bed reactor was used to improve ferrous sulphate oxidation rate with Thiobacillus ferrooxidans immobilised in BSPs (Biomass Support Particles). A maximum iron(II) oxidation rate of 4.4 gL−1h−1 was observed at a dilution rate D = 0.9 h−1.
JENSEN, AB, Webb, Colin
openaire   +2 more sources

A kinetic model for biological oxidation of ferrous iron byThiobacillus ferrooxidans

Biotechnology and Bioengineering, 1997
The kinetics of bacterial oxidation of ferrous iron in the presence of Thiobacillus ferrooxidans cells were studied using an initial-rate method. Measurements of the redox potential of the solution during the oxidation of ferrous iron were used to assess the initial rate of the reaction.
Nemati, M., Webb, C.
openaire   +3 more sources

A novel gene encoding a sulfur-regulated outer membrane protein in Thiobacillus ferrooxidans

Journal of Biotechnology, 1999
Thiobacillus ferrooxidans is a Gram-negative chemolithotrophic bacterium able to oxidize ferrous iron, elemental sulfur and inorganic sulfur compounds. The oxidation of sulfur by T. ferrooxidans resulted in an expression of some outer membrane proteins (OMPs) at a level higher than that observed during ferrous iron oxidation.
Vincenzo Buonfiglio, Mario Polidoro, Ferda Soyer, VALENTI, PIERA, Jessup Shively   +4 more
openaire   +3 more sources

Microbiological leaching of a low-grade uranium ore byThiobacillus ferrooxidans

European Journal Of Applied Microbiology, 1976
The microbiological leaching of low-grade uranium ore has been investigated using a pure strain ofThiobacillus ferrooxidans. It has been shown that only minute quantities of iron are required to achieve a maximum effect on uranium release. The ore sample contained enough iron (3.23%) to produce this effect, consequently, very little influence has been ...
R. Guay, M. Silver, A. E. Torma
openaire   +1 more source