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  • 1990-1994
  • 1980-1984  (5)
  • 1984  (5)
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  • 1990-1994
  • 1980-1984  (5)
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    The Santiago Peak Volcanic rocks of the Peninsular Ranges batholith, Southern California: volcanic rocks associated with coeval gabbros (1984)
    Springer
    Bulletin of volcanology 47 (1984), S. 153-171 
    Details
    ISSN: 1432-0819
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Analyses of the latest Jurassic Santiago Peak volcanic rocks from the western zone of the Peninsular Ranges batholith reveal the existence of two independent groups; one comprising basalts and andesites of the island arc tholeiitic series, and the second made up of the dacites and rhyolites of the subalkaline (calc-alkaline?) series or silicic series. The basalts and andesites have V, Co and Ni contents similar to those estimated for the residual melts in equilibrium with the Peninsular Ranges gabbros. This fact together with the tholeiitic nature of the gabbros and the intimate spatial and temporal relationship between the SPV and the gabbros suggests that the basalts and andesites had a common origin with the gabbros. The mafic volcanism and plutonism seems to have occurred in a youthful island arc and the silicic volcanism in a mature island arc or a continental margin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01960546
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Dermatopathological studies on skin lesions of MRL mice (1984)
    Springer
    Archives of dermatological research 276 (1984), S. 186-194 
    Details
    ISSN: 1432-069X
    Keywords: MRL/l mouse ; New Zealand mouse ; Lupus band test ; Anti-DNA antibodies ; Proteinuria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The MRL-lpr/lpr(MRL/l) mouse is a new animal model for human systemic lupus erythematosus (SLE) and skin lesions with hair loss and scab formation are one of the characteristic manifestations in this mouse. We investigated the histopathology of the skin lesions in MRL/l mice and studied the related autoimmune phenomenon. Light microscopical observations revealed hyperkeratosis, acanthosis, hypergranulosis, liquefaction, vasodilation in the dermis and T-cell infiltration into the dermis at the age of 5 months (mo). Immunohistological studies showed the presence of immunoglobulins and/or complement depositions at the dermal-epidermal junction (DEJ). In some mice there was deposition of immunoglobulin at the DEJ at 2 mo and in 90%–100% of MRL/l mice at over 5 mo. Temporal relationship was present among cutaneous immunoglobulin depositions, the occurrence of anti-DNA antibodies and proteinuria. These findings suggest that MRL/l mice might provide a new aid for studying the biological mechanisms of the development of skin lesions in human SLE.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00414018
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Activity of renal 25-hydroxyvitamin D3-1α-hydroxylase in a case of X-linked hypophosphataemic rickets (1984)
    Springer
    European journal of pediatrics 142 (1984), S. 219-222 
    Details
    ISSN: 1432-1076
    Keywords: Hypophosphataemic rickets ; 1,25(OH)2D ; 1α-hydroxylase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In 1974, a 2-year-old boy was diagnosed as having X-linked hypophosphataemic rickets (XLH) because of severe rickets and hypophosphataemia. The vitamin D metabolite concentrations, blood and urine chemistry and renal 25-hydroxyvitamin D3 (25 OHD3)-1α-hydroxlase were measured in 1982 (about 2 weeks after withdrawal of medication). 1α-hydroxylase was 392 pg/mg tissue/20 min in the patient, which was high compared with aged-matched controls (69.7±28.5 pg/mg tissue/20 min, mean ±SD, n=7). Our present studies showed that the 1α-hydroxylase activity in the patient with XLH was elevated. Therefore, the normal or low 1,25-dihydroxyvitamin D3 (1,25-(OH)2D3) concentrations in XLH patients could be due to accelerated catabolism of 1,25-(OH)2D3 or abnormally regulated 25OHD3-1α-hydroxylase in response to hypophosphataemia, although significantly elevated above that in normal controls.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00442454
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Kinetics and thermodynamics of thermal dehydration of magnesium oxalate dihydrate (1984)
    Springer
    Journal of thermal analysis and calorimetry 29 (1984), S. 87-93 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Kinetik und Thermodynamik der thermischen Dehydratisierung von kristallinen Pulvern von MgC2O4 · 2 H2O wurde thermoanalytisch bei konstanter und linear ansteigender Temperatur untersucht. Die Dehydratisierung des Dihydrats folgt einem der Avrami-Erofeyev-Gesetzen. Die aus TG-Messungen bei konstanter und bei mit der geringsten Geschwindigkeit linear ansteigender Temperatur erhaltenen kinetischen Parameter stimmen gut überein. Die Kinetik der dynamischen Dehydratisierung wurde ebenfalls durch DSC und gleichzeitiger Registrierung der TG-Kurven untersucht. Die Zuverlässigkeit des ermittelten Mechanismus und der bestimmten kinetischen Parameter wird kurz diskutiert.
    Abstract: Резюме Методом термическог о анализа при постоян ных и линейно-возростающи х температурах изучена кинетика и те рмодинамика термической дегидра тации кристаллическ их порошков MgC2O4 · 2 H2O. Реакци я дегидратации подчиняется одному и з уравнений Аврами-Ерофеева. Кине тические параметри, установленные на осн ове ТГ при постоянном нагреве, хорошо согла суются с теми, которые были выведены из данных ТГ при самой низкой скорости подъ ема температур. Динам ика кинетики дегидратац ии была исследована совмещенным методом ДСК-ТГ при линейном на греве. Кратко обсужден меха низм и параметры кинетики реакции дегидратаци и.
    Notes: Abstract The kinetics and thermodynamics of the thermal dehydration of crystalline powders of MgC2O4 · 2 H2O were studied by means of thermal analyses both at constant temperatures and at linearly increasing temperatures. The dehydration of the dihydrate is regulated by one of the Avrami-Erofeyev laws. The kinetic parameters from TG at constant temperatures are in good agreement with those from TG at the lowest rate of rising temperatures. The dynamic dehydration kinetics was also examined, using DSC recorded simultaneously with TG at linearly increasing temperatures. The validity of the estimated mechanism and kinetic parameters is briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02069943
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  • 5
    Electronic Resource
    Electronic Resource
    The kinetic study of thermal dehydration of oxalic acid dihydrate (1984)
    Springer
    Journal of thermal analysis and calorimetry 29 (1984), S. 1115-1122 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Kinetik der thermischen Dehydratisierung von kristallinen Pulvern von (COOH)2 · 2 H2O wurde thermogravimetrisch bei konstanter und linear ansteigender Temperatur untersucht. Es wurde festgestellt, da\ das Avrami-Erofeyev-Gesetz gefolgt wird und die Möglichkeit besteht, da\ gleichzeitig eine phasen grenzflÄchen-kontrollierte Reaktion verlÄuft. Dies wird durch die Beeinflussung der Geschwindigkeitskonstante durch die Partikelgrö\e unterstützt. Die AktivierungsenergieE für die Dehydratisierung wurde zu etwa 80 kJ mol−1 gefunden. Es ist wahrscheinlich, da\ die Effekte von Partikelgrö\e und Temperatur aufE durch den des HÄufigkeitsfaktorsA kompensiert werden.
    Abstract: РЕжУМЕ кИНЕтИкА тЕРМИЧЕскО И ДЕгИДРАтАцИИ кРИстАллИЧЕскИх пОР ОшкОВ ДИгИДРАтА ЩАВЕлЕВОИ кИслОты Бы лА ИсслЕДОВАНА МЕтОД ОМ тЕРМОгРАВИМЕтРИИ кА к пРИ пОстОьННОИ, тАк И лИНЕИНО УВЕлИЧИ ВАУЩЕИсь тЕМпЕРАтУР Ах. НАИДЕНО, ЧтО жАкОН АВРАМИ—ЕРО ФЕЕВА сОглАсУЕтсь с ВОжМОж НОстьУ, ЧтО кОНтРОлИР ОВАННАь РЕАкцИь ФАжА-гРАНИцА пРОтЕкАЕт ОДНОВРЕМЕННО. ЁтО пОД тВЕРжДАЕтсь ВлИьНИЕ М РАжМЕРА ЧАстИц НА кОНстАНтУ с кОРОстИ. ЁНЕРгИь АктИВАцИИE РЕАкцИИ Д ЕгИДРАтАцИИ БылА Уст АНОВлЕНА РАВНОИ пРИБлИжИтЕль НО 80 кДж · МОль−1. ВЕРОьтНО, стО ВлИьНИЕ РАжМЕРОВ ЧАстИц И тЕМпЕРАтУРы НА ЁНЕРг ИУ АктИВАцИИE кОМпЕНсИРУЕтсь ВлИ ь НИЕМ Их НА ЧАстОтНыИ М НОжИтЕльA.
    Notes: Abstract The thermal dehydration kinetics of crystalline powders of (COOH)2 · 2 H2O was examined by thermogravimetry both at constant and linearly increasing temperatures. An Avrami-Erofeyev law is found to hold with a possibility that a phase-boundary controlled reaction proceeds simultaneously. This is supported by the particle size effect on the rate constant. The activation energyE for the dehydration is estimated as around 80 kJ mol−1. It is likely that the effects of particle size and temperature onE are compensated by those on the frequency factorA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02188864
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    Paper (German National Licenses)
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