(n.) Copper pyrites, or yellow copper ore; a common ore of copper, containing copper, iron, and sulphur. It occurs massive and in tetragonal crystals of a bright brass yellow color.
Example Sentences:
(1) On the basis of this experimental work, a flow sheet has been proposed for commercial scale biohydrometallurgical treatment of high-grade chalcopyrite materials.
(2) The bacterial oxidation of naturally occurring gallium-bearing chalcopyrite concentrate and a pure synthetic gallium (III) sulfide has been investigated at pH 1.8 and 35 degree C, using an active culture of Thiobacillus ferrooxidans.
(3) The main values for T. ferrooxidans grown on ferrous iron, chalcopyrite and lead sulfide concentrates were calculated to be 56.0, 60.1 and 54.4% GC respectively.
(4) The following compounds (at a concentration of 1%) were used as an energy source: pyrite, chalcopyrite, arsenopyrite, antimonite, galenite, sphalerite, and copper-zinc-pyrite ore. A considerable part of cells was found to be attached to the surface of crystals in the course of oxidation of the above sulfide minerals.
(5) Jarosite formation was observed during the leaching of the chalcopyrite concentrate.
(6) The microbiological leaching of a chalcopyrite concentrate has been investigated using a pure strain of Thiobacillus ferrooxidans.
(7) Among the methods tested, along with the recommended method of serial transfer in a liquid medium, were methods such as lyophilization, storage in a liquid nitrogen and mixing with sterile, inert carriers like lignite or chalcopyrite ores.
Pyrite
Definition:
(n.) A common mineral of a pale brass-yellow color and brilliant metallic luster, crystallizing in the isometric system; iron pyrites; iron disulphide.
Example Sentences:
(1) The ultrastructure of rabbit tracheal epithelium was studied 2, 8 and 26 hours after termination of 8-hour inhalation of ground pyrite dust.
(2) Evidence for the direct utilization of the sulphur moiety of pyrite by Thiobacillus ferrooxidans was derived from the following observations: a.
(3) An aerobic facultative thermophilic bacterium was isolated from the ore of the Nikolaev copper-zinc-pyrite deposit in the Eastern Kazakhstan.
(4) A research study was carried out at a pyrite mine in Niccioleta, southern Tuscany, during the period 1980-1983 to investigate the possible effects of gaseous and particulate pollutants on the respiratory function of mine workers.
(5) Wistar rats were injected intratracheally with pyrite particles and after 6 and 12 mo, lungs were evaluated for histological changes.
(6) Pyrite particles persist in the cytoplasm of ciliated cells throughout the interval followed up.
(7) It is proposed that the energy-transducing system of the first cellular organism and its precursor was fueled by the oxidation of hydrogen sulfide and ferric sulfide to iron pyrites and two [H+] on the outside surface of a vesicle (the cell membrane), with the concomitant reduction of CO or CO2 on the interior.
(8) A technique was developed for measuring (14)CO(2) uptake by chemolithotrophic bacteria directly in pyritic materials associated with coal and coal refuse.
(9) The cycle is catalytic for pyrite formation and autocatalytic for its own multiplication.
(10) The presence of high concentrations of sulfate, iron, and hydrogen (acid) ions in drainage from coal mines and other areas containing waste pyritic materials is a serious water pollution problem.
(11) The effect of pyrite added to the waste materials before the beginning of leaching has also been examined.
(12) The aforementioned importance is related to the ability of the bacterium to oxidize reduced iron and sulfur, principally found in nature as pyrite (FeS2).
(13) The morphogenesis of Sulfobacillus thermosulfidooxidans BKM B-1269 was studied by electron microscopy at the vegetative stage of growth on a medium with pyrite as the source of energy.
(14) Three species of thermophilic archaebacteria of the genera Sulfolobus (Sulfolobus acidocaldarius and S. solfataricus) and Acidianus (Acidianus brierleyi) were tested for their ability to oxidize pyrite and to grow autotrophically on pyrite, to explore their potential for use in coal desulfurization.
(15) These include: lack of controls while mining is underway; catastrophic events, such as the collapse of a settling dam, lack of site specific understanding of pyrite oxidation processes, particularly those that are biologically enhanced; the need for adequate biological information on which to base decisions to meet biological information on which to base decisions to meet biological objectives.
(16) Ferric, sulfate, and hydrogen ions are produced from pyritic minerals associated with coal as a result of autotrophic bacterial metabolism.
(17) A cohort mortality study was conducted with regard to a pyrite mine located in central Italy.
(18) They were skillful dental surgeons and made prostheses from jade and turquoise and filled teeth with iron pyrite.
(19) Only A. brierleyi was able to oxidize and grow autotrophically on pyrite.
(20) For instance, gold mining in South Africa’s Witwatersrand Basin – on which Johannesburg’s economy was founded – has left 120 mines’ worth of pyrite tailings, containing 450,000 tonnes of uranium.