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  • 1
    Electronic Resource
    Electronic Resource
    Effect of hyperphenylalaninemia on polyphosphoinositides content of rat brain (1982)
    Springer
    Cellular and molecular life sciences 38 (1982), S. 1458-1459 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Hyperphnylalaninemia (experimental PKU) induced in developing rats by treatment with p-chlorophenylalanine (PCPA) plus phenylalanine (PHE) causes a significant reduction in the triphosphoinositide (TPI) and diphosphoinositide (DPI) content of brain. Since TPI and DPI play an important role in excitable nervous membranes, the functional abnormality in experimental and perhaps in genetic PKU may be related to the reduction in TPI and DPI content.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01955769
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  • 2
    Electronic Resource
    Electronic Resource
    Comparison of DMSO and glycerol as cryoprotectants for ascites tumor cells (1983)
    Springer
    Cellular and molecular life sciences 39 (1983), S. 327-328 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Mouse Ehrlich ascites and rat D23 ascites tumors were stored in liquid nitrogen under identical conditions for up to 3 years. Cell viability (trypan blue exclusion) and transplantability of both tumors in animals remained virtually unaffected if preserved in 10% DMSO containing medium, whereas, cells preserved in 10% glycerol failed to produce lethal tumors in rodents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01955331
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  • 3
    Electronic Resource
    Electronic Resource
    Antigenic differences between a primary hamster lymphosarcoma and its liver metastases (1982)
    Springer
    Cellular and molecular life sciences 38 (1982), S. 610-611 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary An antiserum was raised in rabbits against a primary metastasizing lymphosarcoma (ML) of the hamster. This was made tumor-specific by absorption with normal hamster tissue extracts. Immunoglobulin-G was prepared and tested for its cytotoxicity towards cells derived from the primary tumor and its liver metastases. The ML-specific IgG was found to be 2–5 times more cytotoxic for cells derived from the primary tumor compared to cells obtained from liver metastases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02327078
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  • 4
    Electronic Resource
    Electronic Resource
    Influence of microbial concentration on the rheology of non-Newtonian fermentation broths (1999)
    Springer
    Applied microbiology and biotechnology 51 (1999), S. 310-315 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The objective of this study was to quantify the effect of fungal biomass concentration on the rheology of non-Newtonian fermentation systems. Batch fermentations of Penicillium chrysogenum were carried out with glucose as the sole carbon source. The flow behavior of the system was characterized at various fermentation times and was adequately described by the power-law model. The apparent viscosity of the fermentation broth was significantly affected by biomass concentrations in the fermenter. Fermentation broths containing 17.71 g/l biomass as dry weight were characterized by an apparent viscosity of 0.25 Pa s at a shear rate of 50 s−1. Microbial concentration also affected the power-law flow-behavior index and the consistency index. The value of the consistency index ranged from 0.002 Pa s n at a biomass concentration of 0.1 g/l to 6.14 Pa s n at a biomass concentration of 17.71 g/l. The flow-behavior index decreased from an initial value of 1 to a final value of 0.17. Simple empirical correlations have been proposed to quantify the dependence of the power-law parameters on fungal biomass concentration. Experimental data obtained in this study were accurately described by these correlations. The general applicability of these relationships was tested, using previously published rheological data on Aspergillus awamori and Aspergillus niger fermentation broths, and good agreement was seen between experimental data and the predictions from the empirical correlations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530051396
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  • 5
    Electronic Resource
    Electronic Resource
    Predictions of comulative damage for concrete and reinforced concrete (1984)
    Springer
    Materials and structures 17 (1984), S. 65-68 
    Details
    ISSN: 1359-5997
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Description / Table of Contents: Résumé On suggère une équation d'évolution non linéaire de la détérioration en vue de prédire la résistance ultime en fatigue du béton non armé soumis à un chargement séquentiel d'amplitude constante. Cette approche paraît éliminer l'aspect dissipatif de la loi linéaire de dététérioration (hypothèse de Miner) et elle repose sur la forme observée de la relation de croissance de la détérioration. Aux fins de calcul en relation avec l'aptitude au service des structures de béton armé, on a développé une simple relation non linéaire qui relie les augmentations de flèche et les largeurs de fissures avec le taux de sollicitation cyclique. Les résultats se rapprochent des données expérimentales.
    Notes: Abstract Nonlinear damage evolution equation is suggested to predict fatigue life of plain concrete subjected to sequential, constant amplitude loading. This approach seems to eliminate the nonconservative aspect of the linear damage law (the Miner hypothesis) and is based on the observed shape of the damage growth relationship. For serviceability based design of reinforced concrete structures, a simple nonlinear relationship is developed to relate the increases in deflection and crack width with the cycle-ratio. The results compare favorably with experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02474059
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  • 6
    Electronic Resource
    Electronic Resource
    Rate effect on interfacial response between fibres and matrix (1995)
    Springer
    Materials and structures 28 (1995), S. 83-91 
    Details
    ISSN: 1359-5997
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Description / Table of Contents: Resume On a étudié l'effet d'arrachement, à différentes vitesses de glissement, de fibres scellées dans une matrice de ciment. On a établi un système de mesure pour le ‘pendule Charpy’, qui permet d'utiliser deux méthodes indépendantes pour évaluer l'arrachement des fibres du ciment. On a essayé deux séries d'éprouvettes de 16 et 8 fibres, et on a examiné l'effet de la vitesse de glissement et du nombre de fibres. On propose un modèle théorique basé sur la mécanique de la rupture, qui prédit l'effet de la vitesse de glissement sur l'arrachement des fibres. Le modèle proposé, qui s'appuie sur la force maximale d'arrachement des fibres d'un modéle de référence à faible vitesse, peut prédire les forces maximales d'arrachement ainsi que les déplacements correspondant à des vitesses de glissement supérieures.
    Notes: Abstract A study on steel fibres pulled out from a cementitious matrix at different slip rates was conducted. A measurement system, which allows one to use two independent methods to evaluate pull-out load, was developed for the Charpy pendulum. Two series of specimens, with 16 and 8 fibres, respectively, were tested. Effects of the rate of slip and of numbers of fibres on interfacial behaviour have been examined. A theoretical model to predict the slip-rate effect on fibre pull-out has been proposed based on fracture mechanics. Based on the peak fibre pull-out load of a reference specimen with a static slip-rate, the proposed model can predict peak pull-out loads and corresponding slips at faster slip-rates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02473175
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  • 7
    Electronic Resource
    Electronic Resource
    Separating temporally-overlapped waveforms with electrooptic sampling (1996)
    Springer
    Optical and quantum electronics 28 (1996), S. 953-960 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The authors report on a new approach in ultrafast characterization of electronic devices to recover temporally-overlapping incident and reflected signals near a device. The technique involves electrooptic measurement at two locations. With suitable processing, the measured waveforms can be decomposed into components propagating towards and away from the device. Experimental results for coplanar structures are shown.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00820160
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  • 8
    Electronic Resource
    Electronic Resource
    Enhanced nucleation and growth of diamond thin films using a nanodiamond monolayer (1997)
    Springer
    Journal of materials science 16 (1997), S. 476-478 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Abstracts are not published in this journal
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018568427678
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  • 9
    Electronic Resource
    Electronic Resource
    Evolutionary Maximum Entropy Spectral Estimation and Heart Rate Variability Analysis (1998)
    Springer
    Multidimensional systems and signal processing 9 (1998), S. 453-458 
    Details
    ISSN: 1573-0824
    Keywords: non-stationary time series ; evolutionary spectral theory ; spectral analysis of heart rate variability ; cardiovascular time series
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Spectral analysis has been used extensively in heart rate variability (HRV) studies. The spectral content of HRV signals is useful in assessing the status of the autonomic nervous system. Although most of the HRV studies assume stationarity, the statistics of HRV signals change with time due to transients caused by physiological phenomena. Therefore, the use of time-frequency analysis to estimate the time-dependent spectrum of these non-stationary signals is of great importance. Recently, the spectrogram, the Wigner distribution, and the evolutionary periodogram have been used to analyze HRV signals. In this paper, we propose the application of the evolutionary maximum entropy (EME) spectral analysis to HRV signals. The EME spectral analysis is based on the maximum entropy method for stationary processes and the evolutionary spectral theory. It consists in finding an EME spectrum that matches the Fourier coefficients of the evolutionary spectrum. The spectral parameters are efficiently calculated by means of the Levinson algorithm. The EME spectral estimator provides very good time-frequency resolution, sidelobe reduction and parametric modeling of the evolutionary spectrum. With the help of real HRV signals we show the superior performance of the EME over the earlier methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008435130351
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  • 10
    Electronic Resource
    Electronic Resource
    Characterization of the paste-aggregate interfacial transition zone surface roughness and its relationship to the fracture toughness of concrete (1995)
    Springer
    Journal of materials science 30 (1995), S. 3149-3154 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Notched concrete beams containing varying amounts of pea gravel aggregate were tested under three-point bend, and their fracture toughness determined. The roughness of the region near the interface between the cement paste and the aggregate was evaluated by digitizing images from a confocal tandem scanning microscope. The average roughness of the paste was found to be related to the fracture parametersK IC (critical stress intensity factor) and Δa c (critical crack extension), as determined by the two-parameter fracture model. The roughness in the proximity of the paste-aggregate interface was generally higher than that of the paste far from the aggregate, and it decreased with the distance from the aggregate. This study indicates that aggregate particles increase the toughness of the cement paste portion of concrete, and that this is an important mechanism for toughening concrete.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01209230
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