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3 4 dihydroxyphenylacetic acid/versterkte bloedingsneiging
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Changes in DOPAC and 5-HIAA after acute cerebral hemorrhage induced by hypertonic glucose solution (i.p.)--in vivo voltammetry study.
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Intraperitoneal injection of hypertonic glucose solution induced intracranial hemorrhage in rats. Simultaneously determined plasma norepinephrine exponentially increased followed by death. Using in vivo voltammetry, the present study was undertaken to estimate the relationship between neurochemical
Rapid and reliable high-performance liquid chromatographic method for analysing human plasma serotonin, 5-hydroxyindoleacetic acid, homovanillic acid and 3,4-dihydroxyphenylacetic acid.
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The simultaneous measurement of homovanillic acid, 3,4-dihydroxyphenylacetic acid, serotonin and 5-hydroxyindoleacetic acid in human plasma by an ultrafiltration and microbore high-performance liquid chromatography-electrochemical detection technique is established. Conventional preparation of blood
Pharmacological and functional evidence for extracellular 3,4-dihydroxyphenylacetic acid as an index of metabolic activity of the adrenergic neurons: an in vivo voltammetry study in the rat rostral ventrolateral medulla.
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Catecholamine metabolism was studied in vivo in the C1 adrenergic area of the rostral ventrolateral medulla oblongata in rats, using differential normal pulse voltammetry coupled with an activated carbon fiber microelectrode. Pharmacological evidence indicates that 3,4-dihydroxyphenylacetic acid,
Effect of hemorrhagic hypotension on cortical oxygen pressure and striatal extracellular dopamine in cat brain.
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This study investigated the relationships between blood pressure, cortical oxygen pressure, and extracellular striatal dopamine in the brain of adult cats during hemorrhagic hypotension and retransfusion. Oxygen pressure in the blood of the cortex was measured by the oxygen dependent quenching of
Monoamine metabolites in human cerebrospinal fluid. HPLC/ED method.
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Catecholamines and indolealkylamines are of clinical interest in neurological and psychiatric disorders. We measured 3-methoxy-DOPA, 3-methoxy-4-hydroxyphenylglycol, dihydroxyphenylacetic acid, tryptophan, 5-hydroxyindoleacetic acid and homovanillic acid in human cerebrospinal fluid with a simple,
Simultaneous analysis of catecholamine acidic metabolites by single ion monitoring and manual control of the magnetic field.
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A method for multicomponent analysis by single ion monitoring is presented. This method involves monitoring of one ion per selected compound in a GC run. To focus sequentially on each ion, the magnetic field strength of the mass spectrometer is manually reset to the proper value during the intervals
Effects of various stressors on in vivo norepinephrine release in the hypothalamic paraventricular nucleus and on the pituitary-adrenocortical axis.
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The hypothalamic-pituitary adrenocortical (HPA) system and sympathoneural and adrenomedullary systems are major effector systems that serve to maintain homeostasis during stress. Corticotropin-releasing hormone (CRH) in the paraventricular nucleus (PVN) of the hypothalamus, a determinant of both HPA
Rapid measurement of the monoamine content in small volumes of rat plasma.
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A method for the simultaneous measurement of serotonin, catecholamines, and their metabolites, 5-hydroxy-indoleacetic acid, homovanillic acid, and 3, 4-dihydroxyphenylacetic acid, by ultrafiltration and microbore high-performance liquid chromatography with dual electrochemical detection in small
Dopamine metabolite levels in the vitreous of diabetic and non-diabetic humans.
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Animal studies suggest that the retinal dysfunction in diabetic subjects that precedes overt clinical vasculopathy may be due to a retinal dopamine deficit. We analyzed levels of dopamine (DA) and its primary metabolite, 3,4-dihydroxyphenylacetic acid (DOPAC), in the vitreous of diabetic and
Is there a relationship between dopamine and rhegmatogenous retinal detachment?
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Dopamine and its receptors have been widely studied in the neurological conditions and in the retina. In this study, we evaluated the possible role of dopamine in rhegmatogenous retinal detachment (RRD) by comparing the amount of 3,4-dihydroxyphenylacetic acid (DOPAC), a surrogate index of retinal
Effects of transient forebrain ischemia and pargyline on extracellular concentrations of dopamine, serotonin, and their metabolites in the rat striatum as determined by in vivo microdialysis.
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Striatal microdialysis was performed in rats subjected to 20 min of transient forebrain ischemia produced by occlusion of the carotid arteries during hemorrhagic hypotension. Extracellular changes of dopamine, serotonin, and their metabolites were monitored before, during, and after the ischemic
Methamphetamine-induced striatal dopamine release, behavior changes and neurotoxicity in BALB/c mice.
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The behaviors associated with the neurotoxic effects of methamphetamine were evaluated in BALB/c mice. Hyperthermia and behavioral observations were measured 60 min after each subcutaneous injection of methamphetamine (4x4 or 8 mg/kg) or saline, each given 2 h apart. The behavioral observations
Simultaneous measurement of serotonin, catecholamines and their metabolites in cat and human plasma by in vitro microdialysis-microbore high-performance liquid chromatography with amperometric detection.
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A method for the simultaneous measurement of norepinephrine, epinephrine, dopamine, 3,4-dihydroxyphenylacetic acid, homovanillic acid, serotonin and 5-hydroxyindole-3-acetic acid in cat and human plasma by in vitro microdialysis-microbore high-performance liquid chromatography with electrochemical
Nitric oxide modulates dopamine release during global temporary cerebral ischemia.
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Dopamine (DA) is released in large quantities from the striatum during cerebral ischemia. Along with excitatory neurotransmitters, DA plays a role in cellular neuronal ischemic injury. In this study we examined the role of nitric oxide (NO) in the ischemia-induced release of DA. A microdialysis
Kainic acid induced seizures: neurochemical and histopathological changes.
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Behavioural, histopathological and neurochemical changes induced by systemic injection of kainic acid (10 mg/kg, s.c.) were investigated in rats. The most pronounced behavioural changes were strong immobility ("catatonia"), increased incidence of "wet dog shakes", and long-lasting generalized
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