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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 91 (1987), S. 3099-3102 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 207 (1967), S. 484-499 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The emission spectra and the temperature dependence of the relative intensity of luminescence of three manganese activated titanate phosphors [Zn2TiO4, (Mg, Zn)2TiO4, Mg2TiO4] after optical excitation with radiation from 300–500 nm were measured for various temperatures above 4,2 °K. The luminescence of the Mn4+-centre is influenced by the cations (Mg2+ or Zn2+) of the lattice. The temperature dependence of the relative intensity of the luminescence depends on the excitation wavelength. The results are discussed and found to be in good agreement with those of aC-C-model which assumes two energy parabolas for the excited state.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 5 (1966), S. 371-379 
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Résumé La linie ESRg=1,957, caractéristique pour la poudre de ZnO propre activée, a été recherchée. On peut montrer, que la linie bien connue consiste en deux parts (g h=1,9555 etg a=1,9580). Les deux centres paramagnétiques peuvent identifiés en comparant des qualités de luminescence. La part „h” avec lag-valeurg h plus petit provient des pièges à trous remplis, c.-à-d. des ions oxygènes interstitiels. Le deuxième signal partiel „a” provient des activateurs pas ionisés, c.-à-d. des défauts oxygènes occupés d'un électron.
    Abstract: Abstract The ESR-lineg=1,957 of self-activated ZnO-powder is investigated. It can be shown that the well-known ZnO-line consists of two parts (g h=1,9555 andg a=1,9580). The two paramagnetic centers can be identified by considering corresponding luminescence properties. The part „h” with the lowerg-valueg h is given by the filled hole traps, i.e. by oxygen-ions on interstitual places. The second part of the ESR-signal results from activators, which are not ionized, i.e. oxygen defects filled by one electron.
    Notes: Zusammenfassung Es wird die für eigenaktiviertes ZnO-Pulver charakteristische ESR-Linie beig=1,957 untersucht. Es kann gezeigt werden, daß die bekannte ZnO-Linie aus zwei Anteilen besteht (g h=1,9555 undg a=1,9580). Die beiden paramagnetischen Zentren können durch Analogien zu Lumineszenzeigenschaften identifiziert werden. Der Anteil „h” mit dem kleinereng-Faktorg h stammt von den gefüllten Löcherhaftstellen, d. h. von: Sauerstoff-Zwischengitterionen. Das zweite Teilsignal „a” rührt von den nicht-ionisierten Aktivatoren, d. h. von mit einem Elektron besetzten Sauerstofflücken her.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 66 (1988), S. 1084-1084 
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-0711
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Plant and soil 118 (1989), S. 211-219 
    ISSN: 1573-5036
    Keywords: filter hybridization ; Frankia ; in-situ hybridization ; oligonucleotide probes ; rRNA sequences
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Reverse transcriptase sequence analyses of variable regions of 16S rRNA of the nitrogen-fixing (Nif+)Frankia strain Ag45/Mut 15 and the Nif− strains AgB1.9 and AgW1.1 showed large differences in two of three variable regions between bothFrankia groups. Synthetic oligonucleotides complementary to sequences in one of these different regions were used in hybridization experiments against isolated rRNA of severalFrankia strains belonging to three compatibility groups. Ribosomal RNA of eleven effectiveFrankia strains obtained from differentAlnus species strongly hybridized with the probe against the effective strain Ag45/Mut 15 (probe EFP), whereas ineffective strains and effective strains obtained from other hosts (Elaeagnus, Comptonia, Coriaria, Hippophaë, Colletia spp.) did not hybridize. Strong hybridization was also obtained with the effectiveCasuarina strain CcI3. In the group of effective alder strains one strain showed weaker hybridization indicating small sequence differences. Different sequences were also found after hybridization with the probe against the ineffectiveFrankia strains AgB1.9 and AgW1.1 (probe IFP). Only these two strains showed hybridization. The same results were obtained byin-situ hybridizations with probe EFP, whereas hybridization with probe IFP showed crossreaction with several other strains. Tests of these probes against rRNA of several microorganisms indicate a high specificity.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1573-5036
    Keywords: alder ; Alnus glutinosa ; clones ; compatibility ; ecotypes ; Frankia ineffectivity ; N2-fixation ; nodulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Nodulation tests onin-vitro propagated clones ofAlnus glutinosa ecotypes (forest ecotype, pioneer ecotype) withFrankia strains originating from both ecotypes indicated differences in host-plant compatibility. Inoculated plants of the pioneer ecotype clone were not infected by strains, that were unable to fix nitrogen in pure culture. Nodulation could only be induced on the clone of the forest ecotype, but no nitrogen-fixing activity could be detected. Ultra-structural observations of the nodules by SEM and TEM indicated that ineffectivity of these strains was correlated with the lack of vesicles in the infected cells. Cells were only filled with hyphae: neither sporangia nor vesicles could be detected. In contrast, effective nodules could be obtained on both alder clones after inoculation with an effective strain, showing normal development of vesicle clusters in infected cells. In pure culture the ineffective strains produced no vesicles; sporangia were found only during early stage of growth. The results demonstrate the existence ofFrankia strains which were either non-infective or ineffective on different clones ofAlnus glutinosa.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1435-2451
    Keywords: Mediastinal tumors ; Lymphomas ; Validity of diagnostic ; Mediastinaltumoren ; Lymphome ; Wertigkeit der Artdiagnostik
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Unter den malignen Raumforderungen des Mediastinums stellen einzig die Lymphome eine Kontraindikation zur Operation dar. Zu deren sicheren Unterscheidung von anderen, operationsbedürftigen Tumoren können nach unseren Erfahrungen die Feinnadelpunktion, Computer- und Kernspintomographie, Mediastinoskopie mit Lymphknotenbiopsie und die intraoperative Schnellschnitthistologie nur wenig beitragen. Die präoperative Artdiagnostik mittels computertomographisch gesteuerter oder direkter parasternaler Biopsie unter Einschluß der Immunhistochemie könnte eine nicht indizierte Operation vermeiden helfen. Nur in Zweifelsfällen erscheint die Operation mit dem Ziel der Tumorexstirpation gerechtfertigt.
    Notes: Summary Among malignant tumors of the mediastinum lymphomas are no indication for operation. In our experience, however, fine needle puncture, computed tomography (CT), nuclear magnetic resonance, mediastinoscopic biopsy of lymph nodes and intraoperative freeze section histology can only rarely differentiate between lymphomas and other tumors of the mediastinum. Only CT-guided or direct parasternal biopsy including immunhistochemistry can yield a reliable preoperative diagnosis and prevent unnecessary operation of lymphomas.
    Type of Medium: Electronic Resource
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