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  • Best. von Isoniazid, Oxalyldihydrazid, Hydrochinon, Resorcin, organ. Verbindungen  (1)
  • CRF  (1)
  • Erythropoiesis  (1)
  • Hypothalamus  (1)
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  • 1
    ISSN: 1618-2650
    Keywords: Best. von Isoniazid, Oxalyldihydrazid, Hydrochinon, Resorcin, organ. Verbindungen ; coulometrische Titration ; Silber(II)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Conditions are described for the efficient generation of silver(II) and the titration of organic compounds by electrogenerated silver(II). An electrolyte of 0.1 M silver nitrate and 5 M nitric acid at −10°C is used, with a gold generating anode and a current density of 1.5–5 mA/cm2. A potentiometric (platinum-S.C.E. pair) or biamperometric (platinum electrodes, 200 mV) end point detection is used. For potentiometric detection, the platinum electrode is preconditioned with AgO in nitric or by anodization. The compounds isoniazid, oxalyldihydrazide, hydroquinone, and resorcinol were titrated down to sub-milligram quantities with errors of 1–2%.
    Notes: Zusammenfassung Der verwendete Elektrolyt besteht aus 0,1 M Silbernitrat in 5 M Salpetersäure bei −10°C. Die Generatoranode besteht aus Gold (Stromdichte 1,5–5 mA/cm2). Die Bestimmung des Endpunkts erfolgt potentiometrisch (Pt/SKE) oder biamperometrisch (Pt-Elektroden, 200 mV). Für die potentiometrische Bestimmung wird die Indicatorelektrode mit einer Lösung von AgO in Salpetersäure oder durch elektrochemische Anodisierung vorbehandelt. Folgende Substanzen wurden bis herab in den sub-Milligramm-Bereich mit Fehlern von 1–2% titriert: Isoniazid, Oxalyldihydrazid, Hydrochinon, Resorcin.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1439-6327
    Keywords: Altitude ; Hypobaric chamber ; Physical training ; Aerobic metabolism ; Erythropoiesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The effects of training in a hypobaric chamber on aerobic metabolism were studied in five high performance triathletes. During 3 weeks, the subjects modified their usual training schedule (approximately 30 h a week), replacing three sessions of bicycling exercise by three sessions on a cycle ergometer in a hypobaric chamber simulating an altitude of 4,000 m (462 mm Hg). Prior to and after training in the hypobaric chamber the triathletes performed maximal and submaximal exercise in normoxia and hypoxia (462 mm Hg). Respiratory and cardiac parameters were recorded during exercise. Lactacidaemia was measured during maximal exercise. Blood samples were drawn once a week to monitor blood cell parameters and erythropoetin concentrations. Training in the hypobaric chamber had no effect on erythropoiesis, the concentrations of erythropoetin always remaining unchanged, and no effect on the maximal oxygen uptake ( $$\dot V$$ O2max) and maximal aerobic capacity measured in normoxia or hypoxia. Submaximal performance increased by 34% during a submaximal exhausting exercise performed at a simulated altitude of 2,000 m. During a submaximal nonexhausting test, ventilation values tended to decrease for similar exercise intensities after training in hypoxia. The changes in these parameters and the improved performance found for submaximal exercise may have been the result of changes taking place in muscle tissue or the result of training the respiratory muscles.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-1912
    Keywords: Key words Morphine ; Tolerance ; Hypothalamus ; CRF ; AVP ; pituitary-adrenal axis ; Noradrenergic activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The changes in the content of corticotropin-releasing factor (CRF) and arginine vasopressin (AVP) in discrete brain nuclei during chronic opioids administration have not been well established. We evaluated the effects of acute and chronic morphine administration on the content of CRF and AVP in different hypothalamic and extrahypothalamic (bed nucleus of the stria terminalis, BNST) nuclei in rats. Concomitantly, changes in hypothalamic noradrenaline (NA) turnover [estimated by the 3-methoxy-4-hydroxyphenylethyleneglycol MHPG/ NA ratio] and in plasma corticosterone release (as a marker of the activity of the hypothalamus-pituitary-adrenal axis) were determined. Male rats were implanted with placebo (naïve) or morphine (tolerant) pellets for 7 days. On day 8, groups of rats received an acute injection of either saline i.p. or morphine (30mg/kg i.p.) and were sacrificed 30min later. Acute morphine injection to naïve rats increased both the release of corticosterone and the hypothalamic NA turnover. CRF and AVP showed no modifications in the paraventricular nucleus (PVN) or in the median eminence (ME). CRF content decreased in the ventromedian nucleus (VMN) and increased in the BNST, but did not change in the arcuate nucleus (AN). AVP was elevated in the supraoptic nucleus (SON) but not changed in the suprachiasmatic nucleus (SCN). In chronic morphine-treated rats, there was a pronounced decrease in the NA turnover and in the release of corticosterone, which indicates that tolerance develops to the acute effects of morphine. Correspondingly, CRF and AVP were enhanced in the PVN and decreased in the ME, when compared with naïve rats injected with morphine. CRF content was decreased in the AN and in the BNST, but increased in the VMN. The AVP content was decreased in the SON, and no modifications were seen in the SCN. The present study shows that, in addition to the modifications in corticosterone secretion and in hypothalamic NA turnover, chronic morphine administration produces a complex response in the CRF and AVP systems. These modifications might contribute to the behavioral, emotional and neuroendocrine alterations produced during opioid tolerance.
    Type of Medium: Electronic Resource
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