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  • 1
    Electronic Resource
    Electronic Resource
    Raman measurement of vertical conductivity and localization effects in strongly coupled semiconductor periodical structures (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 1825-1831 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Raman scattering was applied to a study of collective plasmon–LO phonon excitations polarized normal to the layers in strongly coupled GaAs/AlAs and δ-doped GaAs superlattices. Thus, the corresponding (vertical) motion of electrons and their localization were studied and compared in both types of superlattices. The localization of the collective excitations caused by the localization of the electrons at the top of the miniband was found in the GaAs/AlAs superlattices. Much stronger localization effects were observed in the δ-doped structures than in the GaAs/AlAs superlattices. Our results reveal evidence of the formation of a miniband structure in the δ-doped structures even in the case of complete localization of electrons inside one period. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372097
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  • 2
    Electronic Resource
    Electronic Resource
    Fourier-transform infrared and Raman spectroscopies of plasmon anisotropy in heavily doped GaAs/AlAs superlattices (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 8024-8029 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The plasmon-longitudinal optical phonon vibrational modes in heavily doped GaAs/AlAs superlattices were analyzed both with Fourier transform infrared and Raman spectroscopies. The modes polarized in the direction normal to the layers were observed in the infrared spectra, while the Raman spectra revealed those modes polarized along the layers. The experimental results allowed us to derive the dispersion relations of the electrons in both directions and these relations were found to be in good agreement with the miniband dispersions calculated in the envelope function approximation when both Γ and X conduction electron states were taken into account. No evidence of the contribution of the two-dimensional electron states to the vertical transport was found. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362354
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  • 3
    Electronic Resource
    Electronic Resource
    IS901, a new member of a widespread class of atypical insertion sequences, is associated with pathogenicity in Mycobacterium avium (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 5 (1991), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: An insertion sequence (IS901), found in pathogenic strains of Mycobacterium avium, but absent in M. avium complex isolates from patients with acquired immune deficiency syndrome (AIDS), has been isolated and sequenced. This insertion element has a nucleotide sequence of 1472 bp, with one open reading frame (0RF1), which codes for a protein of 401 amino acids. The amino acid sequence, terminal ends and target site of IS901 are similar to those of IS900, present in Mycobacterium paratuberculosis. However, the DNA sequences of these two IS elements exhibit only 60% homology, compared to a DNA homology of 98% between their respective hosts. IS901, like IS900, appears to belong to a family of related insertion elements present in actinomycetes and other bacteria. M. avium strains containing IS900 were found to be more virulent in mice than closely related strains lacking IS901. IS901 may be a useful tool for the study of the genetics of virulence in the M. avium complex and for obtaining stable integration of foreign genes into mycobacteria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2958.1991.tb02157.x
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  • 4
    Electronic Resource
    Electronic Resource
    Peroxidase activity as a measure of neutrophil populations in inflammatory peritoneal exudates of rainbow trout, Oncorhynchus mykiss (Walbaum) (1999)
    Oxford, UK : Blackwell Science, Ltd
    Journal of fish diseases 22 (1999), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: A quantitative peroxidase assay using tetramethylbenzidine was applied to exudates from peritoneal cavities of rainbow trout which had been inflamed by intraperitoneal injection of Yersinia ruckeri. Most of the peroxidase activity was cell-associated, with values for extracellular peroxidase below 5% of total peroxidase. No free peroxidase activity was detected in resting cavities. The kinetics of neutrophil numbers and peroxidase activity in peritoneal exudates during the 6 days of inflammation studied followed identical patterns, with a correlation coefficient of 0.996. This shows that the peroxidase assay can be used as an indirect, quantitative evaluation of neutrophil responses during peritoneal inflammation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2761.1999.00149.x
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  • 5
    Electronic Resource
    Electronic Resource
    An exosporium-like outer layer in Bacillus subtilis spores (1976)
    [s.l.] : Nature Publishing Group
    Nature 263 (1976), S. 53-54 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] PM9, a normally sporulating, auxotrophic (Trp C2, Met C3, Phe Al) strain derived from B. subtilis Marburg 168 was used. Spores were obtained in a complex nutrient broth9 and fixed for electron microscopy either untreated or after incubation for 2 h at 37 C in 0.1 M Tris, 8 M urea, at pH 8.5 in the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/263053a0
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  • 6
    Electronic Resource
    Electronic Resource
    Induction of Non-Specific Immunosuppression in Mice by Mycobacterial Infections and Its Relationship to Macrophage Activation (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Scandinavian journal of immunology 30 (1989), S. 0 
    Details
    ISSN: 1365-3083
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The development of non-specific immunosuppression during the infection of different strains of mice with three mycobacterial species was evaluated by studying the immune response to a heterologous antigen (sheep red blood cells) and comparing it with the induction of non-specific resistance to a Listeria monocytogenes challenge. It was shown that early (at 15 days) immunosuppression developed in Mycobacterium avium-susceptible mouse strains infected with a high inoculum dose [2.5 ± 106 colony forming units (CFU)] of virulent M. avium but not in resistant mice infected with a similar inoculum nor in susceptible mice infected by a smaller inoculum dose (2.5 ± 106 CFU). In the latter case it developed only during the second month of infection and was of smaller magnitude. An inoculum of M. avium of attenuated virulence did not induce immunosuppression. M. lepraemurium induced a late immunosuppression, which occurred when extensive bacterial proliferation had already taken place. The non-pathogenic M. bovis BCG induced immunosuppression in C57BL/6 mice. The results do not establish a correlation between the development of generalized immunosuppression and susceptibility to infection. It could be seen that the early immunosuppression was observed in those situations where there was extensive macrophage activation as shown by the development of non-specific resistance to a listeria challenge. The late immunosuppression was observed when bacterial proliferation was extensive.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3083.1989.tb01198.x
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  • 7
    Electronic Resource
    Electronic Resource
    Collagen, the Circulation and Positioning Lymphocytes: a Unifying Clue? (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Scandinavian journal of immunology 31 (1990), S. 0 
    Details
    ISSN: 1365-3083
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3083.1990.tb02766.x
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  • 8
    Electronic Resource
    Electronic Resource
    Radical reactions of N-heterocyclic compounds, XV. Radial intermediates and end products of the oxidation of 3-anilino-1,5-diphenylpyrazoles with Pb(OAc)4 (1997)
    Springer
    Monatshefte für Chemie 128 (1997), S. 261-270 
    Details
    ISSN: 1434-4475
    Keywords: Aminyl radicals ; ESR ; NMR ; Pyrazoles ; Triarylaminium cation radicals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die substituierten 3-Anilino-1,5-diphenylpyrazole1a–i wurden mit Pb(OAc)4 in Benzol oder CH2Cl2 oxidiert. Die intermediären Aminylradikale3f–i wurden ESR-spektroskopisch bei der Oxidation der im Anilinrest methylsubstituierten Pyrazole1f–i nachgewiesen. Die ESR-spektroskopisch nach Oxidation der Pyrazole1a–e beobachteten Radikalintermediate interpretieren wir als Kationradikale6a–e. Diese werden durch Weiteroxidation der Dimeren4a–e gebildet, deren Struktur durch NMR-Untersuchungen und15N-Markierung bewiesen wurde.
    Notes: Summary Substituted 3-anilino-1,5-diphenylpyrazoles1a–i were oxidized with Pb(OAc)4 in benzene or CH2Cl2 solution. The ESR measurements confirmed the formation of aminyl radicals3f–i frompara-CH3 substituted pyrazoles1f–i. The radical intermediates from unsubstituted pyrazoles1a–e were assigned to triarylaminium cation radicals These were generated by consecutive oxidation of the dimeric products4a–e whose structure was proven by NMR spectroscopy and15N labeling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00807892
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  • 9
    Electronic Resource
    Electronic Resource
    The fixative action of uranyl acetate in electron microscopy (1968)
    Springer
    Cellular and molecular life sciences 24 (1968), S. 1074-1074 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Resumen La utilización del acetato de uranilo después del osmio durante la fijación, reduce la cantidad de fosfolípidos extraídos durante la deshidratación de los tejidos, lo que demuestra sus propiedades de fijador químico.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02138757
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  • 10
    Electronic Resource
    Electronic Resource
    Mitochondrial diseases in children: neuroradiological and clinical features in 17 patients (1999)
    Springer
    Neuroradiology 41 (1999), S. 920-928 
    Details
    ISSN: 1432-1920
    Keywords: Key words Mitochondrial diseases ; Leigh's disease ; Kearns-Sayre disease ; Computed tomography ; Magnetic resonance imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Mitochondrial diseases result from structural, biochemical or genetic defects of mitochondria, which contain the respiratory chain. They usually affect children and young adults. We report the CT and MRI findings in 17 patients under 14 years of age, the youngest reported to date, with various mitochondrial diseases. Although imaging studies may be normal negative in the early stages, follow-up usually shows many abnormalities, which depend on clinical status and the disease. We have recognised a spectrum of findings that can be divided into four patterns: nonspecific myelin lesions (8/17); grey-matter nuclei involvement (6/17); a leukodystrophic pattern; and calcification of the brain (1/17), although mixed forms, particularly myelin and grey-matter lesions are frequent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002340050868
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