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Puslapis 1 nuo 19 rezultatus
Lithium chloride stimulates human monocytes to secrete tumor necrosis factor/cachectin.
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The purpose of this study was to examine the effect of lithium chloride (LiCl) on human monocytes. Patients undergoing lithium therapy have elevated white blood cell counts. Since both tumor necrosis factor alpha (TNF alpha) and interleukin 1 (IL-1), which are secreted by monocytes, can stimulate
Differentiation of cerebral radiation necrosis from tumor recurrence by [18F]FDG and 82Rb positron emission tomography.
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Nine radiation-treated brain tumor patients were studied by positron emission tomography (PET) in an attempt to differentiate tumor recurrence from radiation necrosis. Rubidium-82 was used to define the region of absent or disturbed blood-brain barrier and [18F]2-fluoro-2-deoxy-D-glucose ([18F]FDG)
82Rubidium chloride PET discrimination of recurrent intracranial malignancy from radiation necrosis.
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Experimental comparative renal toxicity of lithium and rubidium.
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Rat kidney was perfused using Krebs solution containing 3 or 6 mEq/l lithium or 3 or 6 mEq/l rubidium; the histological lesions thus induced were compared. Rubidium-induced lesions, irrespective of concentrations, consisted of tubular dilations, degeneration and necrosis very similar to those
Effect of physical fitness on myocardial damage and circulation after myocardial necrosis.
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The effect of physical training (conditioning) on myocardial circulation and myocardial damage has been evaluated in experimental myocardial necrosis in albino rats. Conditioning was done by making the animals swim in a tank of water, thermostatically controlled at 32 degrees +/- 1 degrees C, 60
Myocardial metabolism of fluorodeoxyglucose compared to cell membrane integrity for the potassium analogue rubidium-82 for assessing infarct size in man by PET.
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Potassium loss from damaged myocardial cells is linearly related to CPK enzyme loss reflecting extent of necrosis. The potassium analog, rubidium-82 (82Rb), is extracted after i.v. injection and retained in viable myocardium but is not trapped or washed out of necrotic regions. To compare myocardial
Effects of ischemia on intracellular rubidium in pig and rat hearts: (87)Rb NMR imaging and spectroscopic study.
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87Rb MR imaging and spectroscopy were used to study the effects of ischemia on the properties of K(+) in cardiac tissue. Isolated pig and rat hearts perfused by the Langendorff method with Krebs-Henseleit buffer were preloaded with Rb(+). Ischemia (Isc) was induced by 120-min occlusion of the left
Effects of lead, molybdenum, rubidium, arsenic and organochlorines on spermatogenesis in fish: monitoring at Mekong Delta area and in vitro experiment.
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To estimate the influence of water contaminants on fish reproduction in the Mekong Delta area, we sampled cultivated male catfish (Pangasianodon hypophthalmus), investigated testicular development, and measured persistent organic pollutants (POPs) and trace element levels in muscle and liver,
PET of malignant cerebral tumors after interstitial brachytherapy. Demonstration of metabolic activity and correlation with clinical outcome.
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Positron emission tomography (PET) with rubidium-82 (82Rb) and fluorine-18-fluorodeoxyglucose (18F-FDG) was used to diagnose active tumor recurrence and to differentiate this from radiation injury after interstitial irradiation of malignant gliomas. Patients were studied when they presented with
The effects of drugs modulating K(+) transport on Rb(+) uptake and distribution in pig hearts following regional ischemia: (87)Rb MRI study.
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The effects of drugs that can modulate passive permeability of K(+) into cardiomyocytes in normal and reperfusion-damaged cardiac muscle were assessed. Rubidium ion (Rb(+)) was used as a K(+) tracer and (87)Rb-MRI as a detection method. The left anterior descending artery (LAD) of isolated pig
Cytokines affect ion transport in primary cultured thick ascending limb of Henle's loop cells.
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Tumor necrosis factor-alpha (TNF) and interleukin-1 (IL-1) affect epithelial cell ion transport. However, the site of action along the nephron has not been elucidated fully for these cytokines. Thus, the effect of TNF and IL-1 on the ion transport function of primary cultured medullary thick
[Positron-emission tomography (PET) in the evaluation of metabolic processes in the myocardium].
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Nuclear cardiology, and in particular myocardial scintigraphy, is used with increasing frequency to detect the presence of ischemia before revascularization by angioplasty or coronary artery bypass grafting. On the basis of recent publications it is evident that there are certain conditions in which
Abnormalities in myocardial metabolism in patients with unstable angina as assessed by positron emission tomography.
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Regional myocardial perfusion and glucose metabolism were assessed in six normal volunteers and 29 patients with coronary heart disease and stable or unstable angina using rubidium-82 (Rb-82) and F-18 fluoro 2-deoxy-D-glucose (FDG) with positron emission tomography. All normals and patients were
Blood flow distribution within transplantable tumours in the mouse.
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Tumour blood flow was estimated by fractional distribution of rubidium in two allografts (B16 melanoma and Lewis lung tumour) and two xenografts (Glioma 522, a human grade IV astrocytoma and Mel-mo, a human melanoma), in order to investigate the influence of certain tumour characteristics on tumour
Automated quantitation of three-dimensional cardiac positron emission tomography for routine clinical use.
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Visual comparison of rest/stress cardiac positron emission tomography indicates coronary flow reserve for diagnosing and assessing severity of coronary artery disease. An accurate, rapid, automated method for comparison and quantitation of paired cardiac PET studies has been developed to analyze
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