Studies of the obligate chemoautotrophic iron bacteria have been largely descriptive in character. This situation is not due to any lack of interest in the physiology and biochemistry of these bacteria, but rather to the inability to grow them in large numbers, and the attendant problem of harvesting cells free from the voluminous precipitate of iron that accompanies growth. Silverman and Lundg...

A nine year study was carried out on the evolution of macroscopic "acid streamer" growths in acidic, metal-rich mine water from the point of construction of a new channel to drain an abandoned underground copper mine. The new channel became rapidly colonized by acidophilic bacteria: two species of autotrophic iron-oxidizers (Acidithiobacillus ferrivorans and "Ferrovum myxofaciens") and a hetero...

This study deals with bioleaching of the low grade uranium ore of Saghand mine in Iran using a mixed culture of mesophilic bacteria (Acidithiobacillus ferrooxidans, Acidithiobacillus thiooxidans and Leptospirillum ferrooxidans). Experiments were carried out in shaking flask examining the effect of temperature, initial ferrous ion concentration, pulp density and particle size. Variations of ...

Applicability of the manometric method for studying the oxidation of pyritic material in the presence of bacteria has been demonstrated. Resting cells of Ferrobacillus ferrooxidans accelerated the oxidation of coal pyrites and coarsely crystalline marcasite, but were inactive on coarsely crystalline pyrite. Resting cells of Thiobacillus thiooxidans were inactive on all pyrites tested. Oxidation...

Microorganisms are dominant form of life on the Earth. It is necessary to enlarge the knowledge about them for more efficient use in all areas of biotechnology, medicine, ecology. Acidithiobacillus ferrooxidans are acidophilic chemolitoautothropfic bacteria, with capability to oxidize ferrous ions and used in waste water, tail gas treatment and bioleaching technologies. In appropriate condition...

A simple metabolic model of ferrous oxidizing bacteria based on biochemically structured balances of ATP and NAD(P)H is proposed in order to calculate maximum yield and maintenance on ATP. Similar values of growth yield and maintenance were obtained using data of ferrous iron and/or oxygen consumption in Acidithiobacillus ferrooxidans cultures on iron under different conditions. When pyrite was...

Polyphasic genotypic analysis of 25 Acidithiobacillus ferrooxidans strains isolated from ores and ore concentrates collected in different regions of the world showed considerable strain heterogeneity. Restriction patterns of the chromosomal DNA of these strains obtained by PFGE were specific for each strain. According to the degree of DNA relatedness, 17 of the 23 strains studied were divided i...

The iron-oxidizing bacteria Acidithiobacillus ferrooxidans is an example of strictly chemolitotrophic extremophile occurring in acidic environments. The prime niche of these microorganisms is an environment with low pH and high concentrations of iron, sulfide minerals or sulfur. Besides these environments, A. ferrooxidans is also isolated from heavy metal contaminated environments such as soil ...

Acidithiobacillus ferrooxidans ILS-2 was adapted in digested sludge and used to treat for dewaterability improvement. Results showed that increasing ferrous iron loading increased dewaterability, but the inoculation of bioleaching strain had little effect on compared controls without strain. The total extracellular polymeric substances (EPS) contents sludges with treatment were similar except a...

The susceptibility to the fouling of the NiTi and Ti6Al4V alloys due to the adhesion of microorganisms and the biofilm formation is very significant, especially in the context of an inflammatory state induced by implants contaminated by bacteria, and the implants corrosion stimulated by bacteria. The aim of this work was to examine the differences between the sulphur-oxidizing bacteria (SOB) an...