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  • 1985-1989  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 43 (1987), S. 83-85 
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0630
    Keywords: 61.70 ; 78.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract By component analyses of positron lifetime spectra in quenched gold, it was found that positrons are strongly trapped by stacking fault tetrahedra (SFT) at which the lifetime is about 160 ps remarkably smaller than that for monovacancies (∼200 ps) or divacancies (∼220 ps). Positron lifetimes at small vacancy clusters were also estimated in relation to the nucleation process of SFT, with the aid of computer simulation of kinetics of vacancy clustering during quenching and on subsequent isochronal annealing. The results show that large atomic relaxation occurs in small vacancy clusters among which pentavacancies have the largest open-space, thereby having the lifetime of about 230 ps larger than that of trior tetra-vacancies (∼160ps). It is also suggested that tetra- and penta-vacancies act as prenuclei for stable nuclei of SFT consisting of six or more vacancies.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Infection 13 (1985), S. S103 
    ISSN: 1439-0973
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Der Einfluß von Antibiotika auf die Bakterienflora des Darmes und die mit möglichen Superinfektionen nach Antibiotikatherapie assoziierten Befund-Änderungen wurden untersucht. Nach oraler Antibiotikatherapie fanden sich in der Darmflora keine wesentlichen Änderungen. Nach der Injektion von Cephemen der zweiten und dritten Generation verminderten sich jedoch die meisten Bakterien mit Ausnahme vonStreptococcus faecalis, der gegen dieses Medikament resistent ist, und Pilze vermehrten sich. Mit oraler Therapie mit Amoxicillin und Amoxicillin plus Clavulansäure war eine hohe Inzidenz von Diarrhöe assoziiert. Bei manchen Patienten mit geschwächter Abwehr, wie Leukämiepatienten und Neugeborenen, führte die Abnahme der Darmbakterien zu einer Zunahme pathogener Bakterien; sie drangen in den Blutkreislauf ein und verursachten Septikämien. Septikämien, die vom Darmtrakt ausgingen, waren häufig mit der Entwicklung von Vitamin K-Mangel assoziiert. Neben Veränderungen der Darmflora sind Verminderung der oralen Nahrungsaufnahme und die Gabe von Antibiotika mit einer Methylthiotetrazol-Gruppe wichtige Determinanten für den Vitamin K-Mangel.
    Notes: Summary Studies were conducted on the effects of antibiotics on intestinal bacterial flora and symptomatic changes associated with possible superinfection following antibiotic treatment. Following the administration of oral antibiotics, there were no marked changes in the intestinal flora. After second and third-generation cephems were injected, most bacteria, excludingStreptococcus faecalis which is resistant to them, decreased and fungi increased. The incidences of diarrhea after administering oral antibiotics were high for amoxicillin and amoxicillin + clavulanic acid. In some patients with depressed immunity, such as leukemic patients and neonates, decreases in intestinal bacteria after doses of antibiotics led to increases in pathogenic bacteria. They invaded the circulating blood, leading to septicemia. Septicemia originating in the intestinal tract was frequently associated with the development of vitamin K deficiency. Besides changes in the intestinal flora, a decrease in oral food intake and the presence of a methylthiotetrazole group in the structure of the administered antibiotics were also found to play a crucial role in causing vitamin K deficiency
    Type of Medium: Electronic Resource
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