Free Cyanide Solutions
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Photo-assisted electrochemical copper removal from cyanide solutions using porous TiO2 thin film photo-anodes
TiO2 porous films were prepared on ITO coated glass slides by the sol-gel dip-coating method assisted with Polyethylene glycol (PEG). The films were used as photo-anodes in the photo-assisted electrolytic removal of cuprous ions in cyanide media. These were characterized by SEM, UV-Visible spectroscopy and XRD. The PEG modified films were free of cracks and
Mat. Res.. Publicado em: 17/09/2013
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2. Estudo de camadas eletrodepositadas a partir de soluções livres de cianeto = Study of coatings electrodeposited from free cyanide solutions / Study of coatings electrodeposited from free cyanide solutions
As indústrias galvânicas utilizam, durante o seu processo produtivo, vários tipos de soluções químicas, além de água, que, após o seu ciclo de vida, devem ser descartadas. Entre esses insumos, está o cianeto cúprico, que é tóxico ao ser humano e ao meio ambiente e que está presente em vários tipos de revestimentos nos quais uma camada de cobre
Publicado em: 2011
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3. Leaching of a gold bearing partially roasted sulphide. Laboratory scale studies
This research aimed at defining a route for recovering precious metals from a very heterogeneous gold bearing sulphide and arsenide concentrate that was partially roasted and dumped by the 1960s when Santo António mine closed. Gold occurs in this concentrate as free particles in the range of 10-100 mum, most of them still enclosed in the pyrite and arsenopy
Materials Research. Publicado em: 2001-10
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4. Effects of metabolic inhibition and changes of intracellular pH on potassium permeability and contraction of rat uterus.
1. We have investigated the role of changes of potassium efflux in the inhibition of uterine force produced by cyanide. K+ efflux (86Rb) was measured from pregnant and non-pregnant rat myometrial strips during metabolic inhibition with cyanide and following manoeuvres to displace intracellular pH (pHi). 2. Cyanide greatly reduced or abolished spontaneous con
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5. Effect of external cation concentration and metabolic inhibitors on membrane potential of human glial cells.
1. The effect on membrane potential (Em) of low external [K+]o, [Na+]o and [Ca2+]o and of metabolic inhibitors was studied in cultured human glial cells (U-787CG) and human glioma cells (Tp-483MG and U-251MG). Whole cells were voltage or current clamped with the tight-seal recording technique. 2. Em was -76 and -80 mV in glial and glioma cells (mean values i
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6. Responses of type I cells dissociated from the rabbit carotid body to hypoxia.
1. The carotid body chemoreceptors are stimulated in situ by hypoxia. We have studied type I cells freshly dissociated from the carotid body of the rabbit. We have used microfluorimetric and patch clamp techniques to examine the responses to hypoxia, to anoxia, and to metabolic inhibition. 2. NADH autofluorescence measured at both 400 and 500 nm increased ra
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7. Nitric oxide reaction with red blood cells and hemoglobin under heterogeneous conditions
Understanding the interaction of nitric oxide (NO) with red blood cells (RBCs) is vital to elucidating the metabolic fate of NO in the vasculature. Because hemoglobin (Hb) is the most abundant intraerythrocytic protein and reacts rapidly with NO, the interaction of NO with Hb has been studied extensively. We and others have shown the NO reaction with RBCs is
The National Academy of Sciences.
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8. Fluoride uptake by Streptococcus mutans 6715.
The short-term kinetics of fluoride uptake by cells from 20- to 22-h cultures of Streptococcus mutans strain 6715 were studied using rapid filtration and centrifugation techniques. Saline-suspended organisms were diluted with fluoride-containing solutions buffered at four different pH values (2.0, 4.0, 5.5, and 8.2). Fluoride disappearance from the medium wa
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9. Effects of metabolic inhibition on the membrane properties of isolated mouse primary sensory neurones.
1. The patch-clamp technique has been used to investigate the mechanisms that couple membrane excitability to metabolism in neurones isolated from mouse dorsal root ganglia. 2. Blockade of electron transport by cyanide (CN-), reduction of the mitochondrial membrane potential with carbonyl cyanide p-trifluoromethoxyphenyl hydrazone (FCCP), removal of glucose
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10. Release of adenosine, inosine and hypoxanthine from rabbit non-myelinated nerve fibres at rest and during activity.
The composition of the efflux from desheathed rabbit vagus nerve, loaded with radioactivity by incubation in [3H]adenosine, was studied at rest and during electrical activity and after application of inhibitors of ecto-enzymes and modifications of intermediary metabolism. In addition, the degradation of externally applied ATP and adenosine was examined. [3H]
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11. Mitochondrial function in type I cells isolated from rabbit arterial chemoreceptors.
1. In this, and the accompanying paper (Duchen & Biscoe, 1992), we test the hypothesis that the oxygen sensitivity of mitochondrial electron transport forms a basis for transduction in the carotid body, the primary peripheral arterial oxygen sensor. We here describe for isolated type I cells the changes in autofluorescence of mitochondrial NAD(P)H that accom
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12. Measurements of intracellular Ca2+ in dissociated type I cells of the rabbit carotid body.
1. The carotid body chemoreceptors are stimulated in situ by cyanide (CN-), which mimics the effect of hypoxia. We have shown that CN- increases a calcium-dependent potassium conductance (gK(Ca)) in single type I cells dissociated from the carotid body of the rabbit. We have now used the Ca2(+)-sensitive fluorophore, Fura-2, to measure intracellular Ca2+ dir