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Страница 1 от 27 полученные результаты
Liver necrosis and fulminant hepatic failure in rats: protection by oxyanionic form of tungsten.
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The hepatic lesion produced as a result of oxidative stress is of wide occurrence. In the present study, the effect of tungsten on liver necrosis and fulminant hepatic failure (FHF) has been studied in rats treated with various compounds known to produce oxidative stress. Supplementation of animals
Tungsten treatment prevents tumor necrosis factor-induced injury of brain endothelial cells.
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Exposure to recombinant human tumor necrosis factor-alpha (TNF-alpha) or calcium ionophore (A23187) for 4 h increased (P less than 0.05) lactate dehydrogenase (LDH) release from cultured bovine brain endothelial cells (EC). In contrast, treatment with endotoxin or interleukin-1 did not increase (P
Reduction of the ex vivo production of tumor necrosis factor alpha by alveolar phagocytes after administration of coal fly ash and copper smelter dust.
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We investigated the effect of intratracheally instilled coal fly ash (FA) and copper smelter dust (CU) on the lung integrity and on the ex vivo release of tumor necrosis factor alpha (TNF-alpha) by alveolar phagocytes. Groups of female NMRI mice received a single intratracheal administration of
Lung toxicity of hard metal particles and production of interleukin-1, tumor necrosis factor-alpha, fibronectin, and cystatin-c by lung phagocytes.
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Hard metal alloys (WC-Co) are made of a mixture of cobalt (Co; 6%) and tungsten carbide (WC; 94%) particles. Chronic inhalation of hard metal dust can lead to the development of a fibrosing alveolitis, the pathogenesis of which is still undefined. The present investigation was undertaken to assess
Segmental necrosis and its demarcation in experimental micropuncture injury of skeletal muscle fibers.
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Muscle fibers of rat gastrocnemii were punctured in vivo with a tungsten wire whose tip was 10 microns wide. After two hours, most punctured fibers had clearly necrotic segments. The length of necrotic segments appeared to increase between three and four hours. Demarcation of surviving stumps from
A tungsten-supplemented diet delivered by transplacental and breast-feeding routes lowers intestinal xanthine oxidase activity and affords cytoprotection in ischemia-reperfusion injury to the small intestine.
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Ischemia-reperfusion injury has been implicated as playing a major role in the development of necrotizing enterocolitis, a major cause of morbidity and mortality in the newborn. A tungsten-supplemented molybdenum-free diet can reduce xanthine oxidase (XO) enzyme activity in the intestine, which in
Biocompatibility evaluation and corrosion resistance of tungsten added Co-30Cr-4Mo-1Ni alloy.
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Biomaterials are continuously being developed to overcome the drawbacks of existing materials and provide improved function in artificial organs. Currently Co-Cr based alloys are used in many medical applications such as hip and knee implants which still require modification to better perform. In
Intraosseous Heat Production and Preparation Efficiency of Surgical Tungsten Carbide Round Drills: The Effect of Coronectomy on Drill Wear.
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OBJECTIVE
The aim of this in vitro study was to examine the effects of surgical drill wear after coronectomy on bone temperature changes and preparation times for bone cavity drilling.
METHODS
Tungsten carbide round drills were used to perform 10 (D_10), 20 (D_20), or 30 (D_30) coronectomies on
Alveolar macrophages accumulate iron and ferritin after in vivo exposure to iron or tungsten dusts.
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Extracellular iron present in alveolar structures may contribute to oxidative lung injury induced by toxic mineral dusts by enhancing dust-induced generation of hydroxyl radicals. Alveolar macrophages (AMs) can sequester iron within ferritin and limit generation of hydroxyl radicals. In the current
Tungsten determination in biological fluids, hair and nails by plasma emission spectrometry in a case of severe acute intoxication in man.
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A healthy 19-year-old recruit in a French artillery regiment drank 250 mL of a mixture of beer and wine that had rinsed in a hot 155-mm gun-barrel. Fifteen minutes later, he complained of nausea followed by seizures. He was comatose for 24 h, presenting signs of encephalopathy. A moderate renal
Highly efficient ablation of metastatic breast cancer using ammonium-tungsten-bronze nanocube as a novel 1064 nm-laser-driven photothermal agent.
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Photothermal ablation (PTA) therapy has been viewed as an invasive option for cancer therapy with minimal deconstruction of healthy tissues. In this study, a potent candidate of (NH4)xWO3 nanocube was developed for PTA treatment of metastatic breast cancer in the second near-infrared (NIR) window.
Potential mechanisms of endothelialisation in individuals implanted with a leadless pacemaker systems: An experimental in vitro study.
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[Pathology of cardiac lesions induced by radiofrequency ablation in an experimental model].
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Radiofrequency catheter ablation is increasingly being used for the treatment of several tachyarrhythmias. The main aim of this paper is to describe the lesional pathology produced by this type of current. Fourteen Wistar rats (mean weight 300 g) were subjected to discharges of a 700 KHz, pure,
Sodium tungstate (Na2WO4) exposure increases apoptosis in human peripheral blood lymphocytes.
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The potential for adverse health effects of using tungsten and its alloys in military munitions are an important concern to both civilians and the US military. The toxicological implications of exposure to tungsten, its alloys, and the soluble tungstate (Na(2)WO(4)) are currently under
In vitro inflammatory effects of hard metal (WC-Co) nanoparticle exposure.
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Identifying the toxicity of nanoparticles (NPs) is an important area of research as the number of nanomaterial-based consumer and industrial products continually rises. In addition, the potential inflammatory effects resulting from pulmonary NP exposure are emerging as an important aspect of
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