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  • 1995-1999  (8)
  • 1985-1989  (3)
  • 1980-1984  (4)
  • 1
    Digitale Medien
    Digitale Medien
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6270-6272 
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We have investigated the local structural anisotropy of Tb/Fe multilayers using linear polarized synchrotron radiation. X-ray absorption measurements were performed at Fe K edge (7.1 keV) using normal and glancing angle incident photon. From the Fe extended x-ray absorption fine structure (EXAFS), the local structural anisotropy was found for all multilayers as a slight difference of oscillation amplitude between the two incident directions. From the Fourier transformed EXAFS spectra, it is found that the local structural anisotropy shows the maximum at bilayer period of about 1 nm, where perpendicular magnetic anisotropy also shows the maximum value in various rare-earth/transition metal multilayers. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
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  • 2
    Digitale Medien
    Digitale Medien
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 4779-4781 
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Highly ordered MnPt3 alloy film was grown by molecular-beam epitaxy (MBE) at a temperature of 300 °C. The MnPt3 film exhibits a large Kerr rotation, which reaches a maximum value of −0.7° at 1.24 eV. MnPt3(2 nm)/Co(0.6 nm) multilayers were also grown by MBE method onto MgO(111) substrates at a temperature of 300 °C. It was verified by the observation of the reflection high-energy electron diffraction patterns that Co and MnPt3 layers in the film were grown epitaxially on MgO(111). The appearance of superlattice line due to Cu3Au structure in x-ray-diffraction patterns confirmed the formation of the ordered phase in the MnPt3 layer. The hysteresis loops for in-plane and film normal directions became close to each other, which implies that the perpendicular magnetic anisotropy was induced through the multilayered structure. The Kerr spectrum of the MnPt3/Co multilayer have a negative peak of −0.26° around 1.4 eV. This value is fairly smaller in magnitude compared to the one estimated by the effective reflectivity method using the optical and the magneto-optical constants for Co and MnPt3 alloy. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
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  • 3
    Digitale Medien
    Digitale Medien
    s.l. : American Chemical Society
    Journal of chemical information and modeling 21 (1981), S. 86-90 
    ISSN: 1520-5142
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    s.l. : American Chemical Society
    Journal of the American Chemical Society 117 (1995), S. 747-754 
    ISSN: 1520-5126
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5438-5440 
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The magnetic and magneto-optical properties have been investigated for ordered (Mn1−xFex)Pt3 alloy (0〈x〈0.6) films, prepared by annealing (Mn-Fe)/Pt multilayer films at 800 °C. The Kerr spectrum of the MnPt3 film had a large negative peak value of −1.18° at 1.24 eV, and showed a small positive peak around 3.2 eV. With increasing Fe content x, the peak value at 1.24 eV decreased in magnitude and the position of the peak shifted towards lower energy side. Furthermore, another peak appeared in the Kerr spectra around 2.3 eV for x〉0.24. The spectral analysis of the diagonal component of dielectric tensor and the off-diagonal component of conductivity tensor showed that all the peaks mentioned above were attributed to interband transitions. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
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  • 6
    Digitale Medien
    Digitale Medien
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 43 (1987), S. 83-85 
    ISSN: 1600-5740
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Springer
    Journal of neural transmission 50 (1981), S. 283-295 
    ISSN: 1435-1463
    Schlagwort(e): Aspartame ; aspartate ; mice ; water-restriction ; dehydration ; drinking behavior ; hypothalamic lesion
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Weanling mice that had been deprived overnight of water, or of water and diet, were offered a solution containing L-aspartyl-L-phenylalanine-methylester (APM) or monosodium L-aspartate monohydrate (MSA) as the sole source of drinking water, and/or a diet containing large amounts of APM and/or MSA for 30 min, and were killed subsequently. Only those animals exposed to concentrated (6.64% w/v) MSA solutions developed neuronal lesions in the hypothalamic arcuate nuclei. Those offered MSA in the diet only, or APM either in the diet and/or in solution, failed to develop such lesions. Apparently water-restricted weanling mice lose their ability to regulate subsequent drinking behavior, and consume hyperosmolar MSA or APM solutions whose osmolarity or sweetness would be aversive to humans. Such animals are unsuitable for the safety evaluation of APM.
    Materialart: Digitale Medien
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  • 8
    ISSN: 1432-0630
    Schlagwort(e): 61.70 ; 78.70
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: 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.
    Materialart: Digitale Medien
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  • 9
    ISSN: 1434-6052
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The inclusive cross-section for π0 production near 90° inpp collisions at the CERN Intersecting Storage Rings has been studied for thep T range 3〈p T 〈16GeV/c at four different centre-of-mass energies ( $$\sqrt s = 30.6$$ , 44.8, 52.7, and 62.8 GeV). In this experiment the two photons from the π0→yy decay were resolved and measured separately forp T values up to 10 GeV/c. Results indicate an agreement with thep T −8 behaviour for the lower values ofp T and a slower decrease of the cross-section for the higher values ofp T . The high-p T data deviate from the scaling expressionp T −n F(x T ), which holds for the lowerp T values (p T 〈8GeV/c).
    Materialart: Digitale Medien
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  • 10
    Digitale Medien
    Digitale Medien
    Springer
    Infection 13 (1985), S. S103 
    ISSN: 1439-0973
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: 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.
    Notizen: 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
    Materialart: Digitale Medien
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