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  • 1
    ISSN: 1432-0584
    Keywords: Ciclosporin ; Graft-versus-host-disease ; Bone marrow transplantation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Between 1982 and 1986 51 patients were treated with ciclosporin a (CSA) to prevent graft versus host disease (GvHD) after bone marrow transplantation (BMT). Major side effects of the drug were tremor, hypertension, hepatotoxicity and nephrotoxicity. Acute GvHD 0° to II° occurred in 80% of our patients, and GvHD III° and IV° in 20% despite the use of CSA. Two to four days before the onset of GvHD, CSA serum levels were significantly lower on the average in patients who developed GvHD III° and IV° compared to the others. Our data indicate that plasma CSA concentrations higher than 250 ng/ml should be achieved to reduce the severity of GvHD after BMT.
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  • 2
    ISSN: 1434-601X
    Keywords: 23.20.Lv ; 23.20.Nx ; 27.90.+b
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Neutron-rich isotopes of radon, produced by spallation reactions in a ThC2 target and selected chemically, were mass-separated and used as samples for radiation counting experiments. Assignments of the activities to radon isotopes were confirmed by genetic relationships to the previously known francium daughters. The halflife for the new isotope227Rn is 23±1 s and that for226Rn is 7.4±0.1 min. X-rays,γ-rays, and conversion electrons from the223Rn activity were measured. The decay patterns ofK X-rays and known gamma transitions in the223Fr daughter yield a halflife of 23.2± 0.4 min for223Rn, in contrast to the value of 43± 5 min reported earlier. Energies, intensities, and likely multipolarities for the most prominent gamma transitions in the223Rn→223Fr decay are presented.
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  • 3
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Muonic Coulomb capture ratios for 35 fluorides and 13 sulfides have been measured at SIN, Switzerland. We observed a periodic variation with the atomic numberZ of the cation. This is in agreement with recent theoretical calculations.
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 316 (1985), S. 302-302 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR-The classical electrostatic energy ? ? point charges, q, symmetrically disposed on a circular circumference with radius R has been recently discussed here (A. A. Berezin, Nature 315,104; 1985). A surprising feature of these regular polygonal systems was reported for 12 ^ ? =? 400. Such ...
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  • 5
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
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  • 6
    ISSN: 1434-6079
    Keywords: 21.10.Ft ; 21.10.Ky ; 27.80+w ; 35.10.Fk ; 35.80.+s
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The hfs of205Pb in the 283.3-nm resonance line and its isotope shift (IS) have been measured in absorption with the use of dispersive spectroscopy. A new method for calibration and analysis, when internal standards are not available is described. The results are: hfs interaction constantsA=70.3(5)×10−3 cm−1,B=−0.6(1.1)×10−3 cm−1,205Pb-208Pb IS=−123.9(2.0)×10−3 cm−1. The derived nuclear magnetic dipole moment,μ=0.704(5)μ N is in good agreement with values calculated with a nuclear configuration mixing model.
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  • 7
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
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  • 8
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Résumé On a étudié la décomposition du chlorure de magnésium hexahydraté par analyse thermique différentielle et par thermogravimétrie combinée avec l'analyse des gaz dégagés. On a effectué les examens avec un dérivatographe-Q (entre 20 et 400°, sous une pression de 1 bar) en conditions de chauffage quasi-isotherme et dynamique, en changeant le type de creuset. La température de l'élimination étagée de H2O et HCl est influencée par le pression partielle de H2O et HCl. Suivant les conditions, il est possible d'éliminer deux moles d'eau de MgCl2 · 6H2O solide ou fondu, en une étape non-isotherme. En conditions quasi-isobares, MgCl2 · 4H2O réagit, par étapes isothermes, pour donner MgCl2 · H2O et des chlorures basiques de magnésium stables.
    Abstract: Zusammenfassung Vergleichende thermoanalytische Untersuchungen der thermischen Zersetzung von MgCl2 · 6 H2O bis 400° C bei p=1 bar unter quasiisothermen und temperaturdynamischen Bedingungen bei simultaner Gasanalyse (EGA) und Variation des H2O- und HCl-Partialdrucks über der Substanz. Die H2O- und HCl-Abspaltung erfolgt in Stufen, deren Temperatur vom H2O-HCl-Partialdruck beeinflußt wird. In Abhängigkeit von den Bedingungen ist die Überführung in MgCl2 · 4 H2O direkt aus dem Feststoff oder aus einer Schmelze in einem nichtisothermen Schritt möglich. Die Zersetzung von MgCl2 · 4 H2O vollzieht sich unter quasiisobaren Verhältnissen in weiteren drei isothermen Reaktionen über MgCl2 · 2 H2O und thermisch stabile basische Magnesiumchloride.
    Notes: Abstract The decomposition of magnesium chloride hexahydrate was followed by differential thermal analysis and thermogravimetry in combination with evolved gas analysis. The examinations were carried out by means of a Q-derivatograph (temperature range 20–400°; pressure 1 bar) under quasiisothermal and dynamic heating conditions, with variation of the crucible type. The temperatures of the stepwise decomposition of H2O and HCl are influenced by the partial pressures of H2O and HCl. Depending on the conditions, it is possible to remove 2 moles of water from solid MgCl2 · 6 H2O or from a melt in a nonisothermal step. Under quasiisobaric conditions MgCl2 · 4 H2O is transformed in isothermal steps to MgCl2 · 2 H2O and stable basic magnesium chlorides.
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  • 9
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Trotz zahlreicher Untersuchungen sind die Angaben über die thermische Zersetzung von Borax in der Literatur widersprüchlich. Auf der Grundlage thermischer, röntgenographischer, gasanalytischer und optischer Untersuchungen kann dieser Sachverhalt auf einen komplexen Zersetzungsmechanismus zurückgeführt werden. Reaktionsprodukt nach der Abgabe von ca. 8 Molen Wasser ist eine röntgenamorphe Phase mit den thermischen Eigenschaften eines Glases. Zwischen 500 und 600
    Abstract: РЕжУМЕ НЕсМОтРь НА МНОгОЧИс лЕННыЕ ИсслЕДОВАНИь, лИтЕРАтУРНыЕ ДАННыЕ пО тЕРМИЧЕскОМУ РАжлОжЕНИУ БУРы ьВль Утсь пРОтИВОРЕЧИВыМ И. НА ОсНОВАНИИ тЕРМИЧЕск Их, РЕНтгЕНОгРАФИЧЕс кИх, гАж-АНАлИтИЧЕскИх И О птИЧЕскИх ИсслЕДОВА НИИ ЁтОт ФАкт МОжЕт Быть ОБУслОВлЕН слОжНыМ М ЕхАНИжМОА ЕЕ РАжлОжЕ НИь. пОслЕ ВыДЕлЕНИь пРИБлИжИт ЕльНО 8 МОлЕИ ВОДы, РЕАкцИОНН ыИ пРОДУкт ьВльЕтсь РЕНтгЕНОгРАФИЧЕскИ АМОРФНыМ И ОБлАДАУЩИ И тЕРМИЧЕскИМ хАРАктЕ РОМ стЕклА. пРИ ДАльНЕ ИшЕИ пОтЕРИ ВЕсА МЕжДУ 500–600
    Notes: Abstract In spite of numerous investigations the literature data on the thermal decomposition of borax are contradictory. On the basis of thermal, X-ray, gas analytical and optical investigations this fact can be attributed to the complex decomposition mechanism. After the release of about 8 mole water the reaction product is an X-ray amorphous phase, having the thermal behaviour of glass. From this glass sodium diborate (Na2O.2B2O3) crystallizes between 500–600
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  • 10
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Das thermische Verhalten der Solvate und Mischsolvate der Systeme LiCl, (MgCl2, AlCl3)-Wasser-1,4 Dioxan wurde mit Hilfe von DTA-Messungen zum Schmelzverhalten, und quasi-isothermen und quasi-isobaren Untersuchungen zum Ablauf der thermischen Zersetzung Untersucht. Die Verbindungen schmelzen inkongruent. Die Lage der Schmelzpunkte und der Verlauf der thermischen Zersetzung bekräftigen die Vorstellungen, daß 1,4 Dioxan im Mischsolvat des Lithiums in der ersten Koordinationsphäre direkt am Kation, hingegen bei Magnesium und Aluminium über Wasserstoffbrücken gebunden ist. Die Zersetzung der wasserfreien Solvate führt nur im Fall der Lithium- und Magnesiumverbindungen zu den wasserfreien Chloriden.
    Abstract: Резюме Термическое поведен ие сольватов и смешан ных сольватированных си стем хлористый литий (хлорид магния, х лорид алюминия)-вода-1,4-диоксан было исследовани ДТА измерениями их плавления, а квази-и зотермическими и квази-изобарными мет одами — процесс их термического разлож ения. Соединения плав ятся инконгруэнтно. Полож ение их точек плавлен ия и процесс термическо го разложения подтве рждают предположение, что 1,4-ди оксан связан с литием в первой коорд инационной сфере его смешанного сольвата. В случае же х лоридов магния и алюминия, он связан с катионами не прямо, а посредством водород ных связей. Только для соединений лития и ма гния термическое раз ложение безводных сольватов приводит к образованию безводн ых хлоридов.
    Notes: Abstract The thermal behaviour of the solvates and mixed solvates in the LiCl(MgCl2, AlCl3)-water-1,4-dioxane systems was investigated by means of DTA measurements of the melting behaviour and by quasi-isothermal and quasi-isobaric investigations of the thermal decomposition processes. The compounds melt incongruently. The positions of the melting points and the processes of thermal decomposition confirm the assumption that 1,4-dioxane is bonded in the first coordination sphere in the mixed solvate of lithium, but in the cases of magnesium and aluminium chloride it is bonded via hydrogen-bonds and not directly to the cations. Only for the lithium and magnesium compounds does the decomposition of the anhydrous solvates result in anhydrous chlorides.
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