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  • 1
    ISSN: 0942-0940
    Keywords: Cerebral vasospasm ; subarachnoid haemorrhage ; lupus anticoagulant ; anti-cardiolipin antibodies ; platelet
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Delayed ischaemic deficits due to cerebral vasospasm contribute to the high morbidity and mortality rates associated with subarachnoid haemorrhage. We evaluated the usefulness of measuring anti-phospholipid antibodies (aPLs) for prediction of the occurrence of symptomatic vasospasm and the outcome after subarachnoid haemorrhage. 32 consecutive patients with subarachnoid haemorrhage due to ruptured cerebral aneurysms were studied. They were admitted and operated on within 72 hours after the onset of subarachnoid haemorrhage. aPLs such as lupus anticoagulants, anti-cardiolipin IgG and anti-cardiolipin IgM were measured repeatedly after admission. Furthermore, platelet count, platelet aggregability and plasma platelet factor 4 were also measured. Eleven among the 32 patients (34.4%) showed positive in the examination for aPLs. Although aPLs could not predict symptomatic vasospasm, once symptomatic vasospasm occurred, patients with aPLs frequently demonstrated cerebral infarction and there-fore their outcome was worse. aPLs were associated with a severe initial clinical grade and SAH grade on CT scan. Therefore it may explain the association of aPLs with worse outcome. aPLs were detected between 1 and 7 days. Four of 6 patients (67%) with aPLs became negative between 7 and 13 days after subarachnoid haemorrhage. The mechanism of transient aPLs is unclear but it is more likely to occur in the severer grade patients. The reduction in platelet count, the increased platelet aggregability, and the increased plasma platelet factor 4 concentration were also observed in aPLs-positive patients with symptomatic vasospasm.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 1846-1851 
    ISSN: 0392-6737
    Keywords: Electronic properties of thin films
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si sono studiati due tipi di fenomeni di commutazione in film sottili amorfi e policristallini di CdIn2S4 che sono stati ottenuti col metodo di evaporazione nel vuoto e col metodo di spruzzamento a c.c., rispettivamente. Uno è il cosiddetto fenomeno di commutazione della memoria che nasce dal percorso del filamento a bassa resistenza. Un altro è il caratteristico fenomeno di commutazione nel quale la resistività cambia bruscamente ogni qual volta la temperatura ambiente raggiunge un valore critico. Il tempo di commutazione è breve e intorno ai 100 ns. Questo fenomeno di commutazione è in relazione ai difetti innati nel reticolo CdIn2S4 perché questi possono essere osservati nei film policristallini cosí come nei film sottili amorfi.
    Abstract: РезУме Исследуится два типа явлений коммутации в поликристаллических и аморфных тонких пленках CdIn2S4, которые приготовлены методом вакуумного испарения и методом d.c. напыления. Одно явление представляет так называемое явление запоминающею коммутации. Другое представляет характеристическое явление коммутации, в котором удельное сопротивление резко меняется, когда температура окружающею среды достигает критическою величины. Время коммутации меньше или порядка 100 нс. Это явление коммутации связано с природными дефектами в решетке CdIn2S4, так как они могут наблюдаться в поликристаллических, а талже в аморфных тонких пленках.
    Notes: Summary Two kinds of switching phenomena in CdIn2S4 polycrystalline and amorphous thin films which were prepared by the vacuum evaporation method and the d.c. sputtering method, respectively, were studied. One is the so-called memory switching phenomenon arising from the low resistive filament path. Another is a characteristic switching phenomenon in which the resistivity abruptly changes whenever the ambient temperature reaches a critical value. The switching time is fast and about 100 ns. This switching phenomenon is related to the native defects in the CdIn2S4 lattice, because they can be observed in the polycrystalline as well as in the amorphous thin films.
    Type of Medium: Electronic Resource
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