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  • 1
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Based upon studies of natural quartz and upon laboratory experiments on mechanical and chemical destruction of quartz, it was established that the statistical density characteristics of detrital quartz change during sedimentary processes. Grains with defective structure, gas-liquid inclusions, inclusions of organic matter and other lighter minerals have lesser densities, whereas grains with inclusions of heavier minerals have larger densities than those of optically pure grains. The susceptibility to destruction is less for optically pure grains than for grains with lower or higher density. This is responsible for the increasing maturity of quartz sand during weathering and transport as indicated by the increasing percentage of optically pure grains. Mathematical modelling of the dynamics of this process was carried out.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 26 (1954), S. 734-735 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 28 (1956), S. 507-508 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Mineralium deposita 22 (1987), S. 18-25 
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The vein graphite deposits of Sri Lanka are located in a Precambrian high grade metamorphic terrain dominated by granulite facies rocks. The vein graphite has been interpreted as being of solid phase lateral secretion origin, derived by hydrothermal solutions or of biogenic origin. Based on what is known on the composition of the fluids under granulite facies conditions and the role of these fluids in their transport through the crust, the origin of the graphite is proposed to be the direct consequence of granulite facies metamorphism in the presence of a CO2 rich fluid under low fO2 conditions. This CO2 rich fluid could promote hydraulic fracturing and precipitation of vein graphite. Textures and structures of the vein graphite indicate syntectonic deposition by a crack-seal process under granulite facies metamorphic conditions. This model is supported by temperature estimates on graphite based on XRD data and stable carbon isotopes of graphite that suggest a deep-seated crustal origin.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-0711
    Keywords: Key words Epidural analgesia ; Parenteral pethidine ; Labor ; Pain ; Visual analog scale
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  The study was aimed to define parturients’ opinion on either epidural analgesia or intravenous pethidine, and to determine the effect of both analgesics after delivery. We interviewed and examined 401 consecutive parturients who requested analgesia during the beginning of their active stage of labor. Of those, 131 women requested and underwent epidural analgesia, and 270 received parenteral pethidine. The pain experienced before admission of any analgesia, was significantly higher in the epidural group than in the parental group (mean visual analog scale (VAS) score 8.9 and 8.4, respectively; P=0.004). However, after analgesics, women from the epidural analgesia experienced significantly less pain during labor as compared to those receiving pethidine (mean VAS scores 5.05 vs. 9.14, respectively; p〈0.001). The pain scores 24 h after labor were significantly lower in patients who underwent epidural analgesia (1.69 vs. 2.13, respectively; p〈0.001). We conclude that epidural analgesia is more effective than parenteral analgesia in pain and discomfort relief. This method is helpful also the day after delivery. Thus, epidural analgesia should be strongly recommended to all patients who do not have any medical contraindications to this method of treatment.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    European journal of pediatrics 152 (1993), S. 721-726 
    ISSN: 1432-1076
    Keywords: Growth hormone neurosecretory dysfunction (GHND) ; β-Thalasaemia major
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Growth hormone (GH) secretion was determined by evaluating ultradian GH profiles for 12 h and GH responses to insulin stimulated hypoglycaemia (ITT) in 28 stunted boys with β-thalassaemia major aged 15.2–17.4 years, who presented with pubertal failure (FP). Healthy non thalassaemia prepubertal boys (n=10) aged 7.5–8.8 years, were studied as controls. All patients had normal responses to ITT with peak GH levels ≥15 mU/l. Basal GH concentrations (mean±sem) (1.65±0.03 mU/l vs 2.58±0.27 mU/l;P〈0.05) and the stimulated GH responses (peak GH=15.4±0.20 mU/l vs 21.08±0.78 mU/l;P〈0.001) were significantly lower in the patients with failed puberty than in the controls, indicating that the FP patients had diminished GH reserve and secretory capacity. Moreover, all the GH peak parameters including the maximum spontaneous concentrations (MX-GH) and the area under the GH curve (AUC) were significantly lower in the thalassaemic patients than in the controls (MX-GH=5.2±0.21 mU/l vs 20.42±0.14 mU/l;P〈0.001; AUCb=421.22±4.31 mU/l vs 712.20±3.42 mU/l;P〈0.001). These observations suggest that the thalassaemic patients had endogenous neurosecretory GH deficiency (GHND). Priming with sex steroid did not cause any improvement in the spontaneous or stimulated GH secretory patterns in thalassaemic patients. It was noteworthy that in neither the patients nor the control subjects, was there a significant correlation between the maximum stimulated and the MX-GH concentrations. These data suggest that the provocative ITT underestimates spontaneous GH secretion and that measurement of spontaneous GH secretion was a more reliable method for identifying patients with GH insufficiency than the ITT.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    European journal of pediatrics 156 (1997), S. 243-244 
    ISSN: 1432-1076
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of cosmetic science 8 (1986), S. 0 
    ISSN: 1468-2494
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Stratum corneum moisturization was measured by two instruments simultaneously on the same subjects at different body sites. One instrument is based on the 1 GHz focused mirowave dielectric measurement; the other instrument measures impedance at 16 Hz.A linear relationship r = 0.86 was observed between the measurements by the two above-mentioned instruments. The 1 GHz focused microwave measurement is more accurate in measuring water concentration in the stratum corneum, especially in the upper layers relevant to “moisturization”; it is, however, an expensive research instrument. The low frequency impedance measurement involves a much simpler, cheaper and portable instrument which can be used routinely to evaluate ‘moisturization’ for the purpose of skin classification under field conditions.Comparaison de divers appareils de mesure de I'hydratation de la couche cornee〈section xml:id="abs1-2"〉〈title type="main"〉ésuméL'hydratation de la couche cornée a été mesurée simultanément par deux appareils sur plusieurs sites de mêmes sujets: le front, la face et les membres. Un appareil est basé sur la mesure par micro ondes, I'autre mesure I'impédance à 16 Hz.On observe une relation linéaire, r= 0.86, entre les mesures effectuées par les deux appareils ci-dessus. L'appareil à micro ondes est plus précis pour la mesure de la concentration en eau de la couche cornée et plus spécialement dans les couches supérieures qui sont importantes pour I'hydratation, mais cet appareil est onéreux. La mesure des impédances à basse fréquence utilisé un appareil portable, simple et bon marché qui peut être utilisé en routine pour évaluer I'hydratation dans le but de classer des types de peaux sur le terrain.II n'est pas toujours possible de comparer des appareils diffeérents sur les mêmes personnes et dans le même temps et il est encore plus difficile d'obtenir des donneées sur un nombre de personnes de type diffeérent. Nous suggeérons d'utiliser à I'avenir une meéthode de comparaison diffeérente basée sur I'application d'un traitement standard bien défini, qui pourrait par example consister en I'application pendant une heure d'une solution à 2% de glycérine sur I'avant bras, avant la mesure.Ces données, avec la connaissance de la distribution des valeur du prétraitement pour les divers appareils, permettraient également la comparaison et la validation des différentes méthodes.
    Type of Medium: Electronic Resource
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