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  • 1
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 6-7 (Jan. 1989), p. 309-314 
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Environmental geology 30 (1997), S. 189-197 
    ISSN: 1432-0495
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  The objectives of the interdisciplinary pilot project "Development of a municipal environmental information system" in Hannover encompassed the development, modification and improvement of data acquisition methods and methods for describing the environment on the basis of this data, as well as methods for evaluating the data as a basis for measures affecting the environment taken by the community. The subproject "Urban Soils" had the following two main objectives: (i) development of a data acquisition method for soils in municipal areas and a method for evaluating this data, and (ii) development of methods for making this information available to local government in the form of a "soil information system" for urban areas. To achieve these objectives, the following work was carried out: (1) a factor analysis to determine which factors affect the soil in an urban area; (2) study of methods for mapping soils in cities; (3) development of a concept for a soil information system; and (4) evaluation of environmental problems of the municipality using the soil information system. Data acquisition was done in two steps: First, soil-relevant data was selected, standardized, digitized and stored in an alphanumeric and a graphic database for a factor analysis. By intersection of the eight information levels, the factors affecting the soil were determined for the city of Hannover (200 km2). To test the hypothesis that the results for one site can be transferred to another site with the same combination of factors, 43 test sites typical of urban land use were selected. These test sites were mapped in a way to fulfill geostatistical requirements; physical and chemical analyses of the soils were made. A prognosis of soil distribution and properties was made on the basis of the factor analysis. and compared with the actual conditions. Concurrent with the pedological research, a prototype soil information system was developed. The system consists of databases, a methodbase, a geometrical tool, and a control system. Alphanumeric data is stored in a relational database, the geometric data in ISAM files. Methods for determining soil parameter values were selected and tested for their applicability. Using the pedological data and the soil information system, information can be obtained about soil conditions in Hannover as well as about soil processes (e.g. infiltration rates) and interaction with the atmosphere, hydrosphere, etc. This information can be obtained in the form of thematic maps and statistical representations, which can be used by decision-makers at the municipal level.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 57 (1979), S. 1317-1321 
    ISSN: 1432-1440
    Keywords: Angioimmunoblastic lymphadenopathy ; Immunoblastic lymphadenopathy ; Virus infection ; Rubella virus ; Immunopathology ; Angioimmunoblastische Lymphadenopathie ; Immunoblastische Lymphadenopathie ; Virusinfekt ; Rötelnvirus ; Immunpathologie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Mit immunhistologischen Methoden wurden in zwei Fällen von angioimmunoblastischer Lymphadenopathie Rötelnantigene in Lymphknoten nachgewiesen. Ein Patient hatte einen hohen Rötelnantikörpertiter und eine Myocarditis. Diese Befunde stützen die Vermutung, daß sich die angioimmunoblastische Lymphadenopathie aus einem Zusammenspiel von persistierendem Virusinfekt und partiellem Immundefekt entwickelt.
    Notes: Summary The presence of rubella virus antigen was demonstrated by means of immunohistological methods in two cases of angioimmunoblastic lymphadenopathy. One patient had elevated serum anti rubella titer and myocarditis. These findings support the idea that angioimmunoblastic lymphadenopathy develops as a combined effect of persistent virus infection and partial immune deficiency.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Lung 132 (1965), S. 103-103 
    ISSN: 1432-1750
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Biological cybernetics 79 (1998), S. 15-27 
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract. A nonlinear analysis of the underlying dynamics of a biomedical time series is proposed by means of a multi-dimensional testing of nonlinear Markovian hypotheses in the observed time series. The observed dynamics of the original N-dimensional biomedical time series is tested against a hierarchy of null hypotheses corresponding to N-dimensional nonlinear Markov processes of increasing order, whose conditional probability densities are estimated using neural networks. For each of the N time series, a measure based on higher order cumulants quantifies the independence between the past of the N-dimensional time series, and its value r steps ahead. This cumulant-based measure is used as a discriminating statistic for testing the null hypotheses. Experiments performed on artificial and real world examples, including autoregressive models, noisy chaos, and nonchaotic nonlinear processes, show the effectiveness of the proposed approach in modeling multivariate systems, predicting multidimensional time series, and characterizing the structure of biological systems. Electroencephalogram (EEG) time series and heart rate variability trends are tested as biomedical signal examples.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 10 (1988), S. 221-227 
    ISSN: 0392-6737
    Keywords: Electron microscopy determinations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Nel presente lavoro si mostrano alcuni risultati riguardanti lo studio del danno provocato dal bombardamento con Ar+ durante l'assottigliamento di campioni di GaAs impiantato con Si+. Gli effetti prodotti da tale tecnica sono stati osservati e valutati su sezioni trasversali dei campioni tramite microscopia elettronica ad alta risoluzione (HRTEM).
    Abstract: Резюме Приводятся результаты исследования влияния Ar+-бомбаровки в процессе утончения кристаллов GaAs, имплантированных Si+. Используя трансмиссионную электронную микроскопию высокого разрешения, оцениваются эффекты, связанные с разупорядочением слоев при Ar+-бомбардировке.
    Notes: Summary The results obtained by cross-sectional technique applied to Si+-implanted GaAs crystals, thinned by Ar+-milling, are presented. The effects of the disordered layers produced by Ar+-milling have been estimated through high-resolution transmission electron microscopy (HRTEM).
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 50 (1994), S. 709-730 
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The structure of the copper protein plastocyanin from poplar leaves (Populus nigra var. italica) at 173 K has been subjected to two independent refinements, using a single set of synchrotron X-ray data at 1.6 A resolution. Energy-restrained refinement using the program EREF resulted in lower root-mean-square deviations from ideal geometry (e.g. 0.011 Å for bond lengths) but a higher residual R (0.153) than restrained least-squares refinement using the program PROLSQ (0.014 Å, 0.132). Electron-density difference maps in both refinements provided evidence for disorder at some side chains and solvent atoms, and the PROLSQ refinement made allowance for this disorder. The number of solvent sites identified at the 4σ(ρ) level was 171 in the EREF refinement and 189 in the PROLSQ refinement; 159 of the solvent sites are common to both refinements within 1 Å. The root-mean-square differences between the atomic positions produced by the two refinements are 0.08 Å for Cα atoms, 0.08 Å for backbone atoms and 0.12 Å for all non-H atoms (excluding six obvious outliers) of the protein molecule. The two sets of Cu–ligand bond lengths differ by up to 0.07 Å, and the ligand–Cu–ligand angles by up to 7°. At 173 K the volume of the unit cell is 4.2% smaller than at 295 K. Greater order in the solvent region is indicated by the location of 79 more solvent sites, the identification of extensive networks of hydrogen-bonded rings of solvent molecules, and a general decrease in the thermal parameters. Within the unit cell, the protein molecules are significantly translated and rotated from their positions at ambient temperature. An important structural change at low temperature is a 180° flip of the peptide group at Ser48-Gly49. Nearly all other significant differences between the structures of the protein at 173 and 295 K occur at exposed side chains. If the backbone atoms in the 173 and 295 K structures are superposed, excluding atoms involved in the peptide flip, the root-mean- square difference between the positions of 393 atoms is 0.25 Å. Two internal water molecules, not included in previous descriptions of poplar plastocyanin, have been located. The plastocyanin Cu-site geometry at 173 K is not significantly different from that at 295 K. If plastocyanin undergoes a change in Cu-site geometry at low temperature, as has been suggested on the basis of resonance Raman spectroscopic evidence, then the change is not detected within the limits of precision of the present results.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochemical and Biophysical Research Communications 75 (1977), S. 427-433 
    ISSN: 0006-291X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochemical and Biophysical Research Communications 67 (1975), S. 596-603 
    ISSN: 0006-291X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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