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  • Springer  (77)
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Keywords
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  • 1
    Electronic Resource
    Electronic Resource
    A simple laser-triggered spark gap for kilovolt pulses of accurately variable timing (1969)
    Springer
    Optical and quantum electronics 1 (1969), S. 62-64 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01476795
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  • 2
    Electronic Resource
    Electronic Resource
    Flow due to the longitudinal and torsional oscillation of a cylinder (1990)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 41 (1990), S. 598-603 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Summary An exact solution is obtained for the motion of a fluid contained in an infinité circular cylinder which is undergoing both torsional and longitudinal oscillations. An analytical expression is obtained for the viscous drag on the cylinder and the velocity is depicted graphically. Where possible, comparisons are made with corresponding results for the external problem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00945958
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  • 3
    Electronic Resource
    Electronic Resource
    Morphogenetic and cytogenetic effects of 7,12-dimethylbenz(a)anthracene onHaworthia callus in vitro (1972)
    Springer
    Cellular and molecular life sciences 28 (1972), S. 1497-1498 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung 7,12-Dimethylbenz(a)anthracen (DMBA) in verschiedenen Konzentrationen anstelle von Auxin, Kinetin und Kokosmilch im Nährmedium induziert die Bildung von Wurzeln und beblätterten Sprossen auf den Kalli vonHaworthia variegata. Dieses Ergebnis gleicht demjenigen im vollständigen Kontrollmedium ohne DMBA, mit dem Unterschied, dass unter dem Einfluss von DMBA weniger Sprosse und eine grössere Anzahl von Wurzeln gebildet werden. Cytologische Untersuchungen an Kallus- und Wurzelzellen aus dem DMBA-Medium zeigten eine normale Konstitution des Chromosomensatzes ohne chromosomale Aberrationen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01957877
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  • 4
    Electronic Resource
    Electronic Resource
    Isolation of type II epithelial cells from rabbit fetal lungs by adherence on an IgG-coated surface (1996)
    Springer
    Cellular and molecular life sciences 52 (1996), S. 799-802 
    Details
    ISSN: 1420-9071
    Keywords: Pulmonary surfactant ; lung type II epithelial cell isolation ; adherence on IgG plates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The lung is comprised of about 40 different cell types, of which only 15% are type II cells. These are the major, if not the sole, source of synthesis and secretion of lung surfactant. To date a large number of methods have been described for the isolation of pure populations of type II cells using a wide variety of techniques, but most of these have employed differential centrifugation methods and have used adult rodents. The present study reports the isolation of type II cells from fetal rabbit lungs by the immunoglobin G plating method. Pure populations of fetal type II cells in high yield and with good viability were obtained by the procedure for the first time from rabbit fetal tissue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01923992
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  • 5
    Electronic Resource
    Electronic Resource
    Ultrasound Velocity of Trabecular Cubes Reflects Mainly Bone Density and Elasticity (1999)
    Springer
    Calcified tissue international 64 (1999), S. 18-23 
    Details
    ISSN: 1432-0827
    Keywords: Key words: Ultrasound—Velocity—Elasticity—Structure—Density.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. Studies have indicated that quantitative ultrasound (QUS) variables may be influenced by the mechanical properties of bone which in turn are determined by bone's material and structural properties. However, from these studies it is unclear what role density, elasticity, and structure play in determining velocity. Eighteen defatted, 12-mm cubic trabecular bone specimens were cut from cadaveric specimens. Amplitude-dependent speed of sound (SOS) using a single point QUS system was assessed in three orthogonal axes. Magnetic resonance images were obtained, from which measures of apparent trabeuclar structure were derived. The specimens were nondestructively tested in compression along three orthogonal axes defined by the sides of the cubes. The elastic modulus (in the three directions) and the strength (in one direction) were determined. Trabecular BMD was measured by quantitative computed tomography. SOS varied significantly with direction of measurement, with the highest value in the axial direction (axial:1715 m/s, sagittal: 1662 m/second, and coronal: 1676 m/s). SOS of each of the three axes was generally associated with the various mechanical (r = 0.30–0.87), density (r = 0.81–0.93), and bone structural variables (0.3–0.8). However, after adjusting the SOS correlations by density, only the correlation with elasticity remained significant in the coronal direction. BMD alone explained 88–93% of variance in SOS whereas in the multivariate model, BMD plus elasticity and/or anisotropic variables explained 96–98% of the variance in SOS. Variability of SOS is explained mostly by density and to a small extent by elasticity or anisotropy. Since only 2–6% of the variance of the QUS measurement is not explained by density and elasticity, one could conclude that the remaining variance reflects other properties of bone or perhaps simply measurement error. Evidence that these other properties may be structure related is only found in the anisotropy of QUS parameter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002239900572
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  • 6
    Electronic Resource
    Electronic Resource
    Power Spectral Analysis of Vertebral Trabecular Bone Structure from Radiographs: Orientation Dependence and Correlation with Bone Mineral Density and Mechanical Properties (1998)
    Springer
    Calcified tissue international 63 (1998), S. 482-489 
    Details
    ISSN: 1432-0827
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. Trabecular bone structure and bone density contribute to the strength of bone and are potentially important in the study of osteoporosis. Fourier transforms of the textural patterns in radiographs of trabecular bone have previously been used for the measurement of trabecular bone structure in subjects, however, the relationship between these measures and biomechanical properties of bone have not previously been established. In this study radiographs were acquired of 28 cubic specimens of spinal trabecular bone along each of the three anatomic axes: cranio-caudal or superior-inferior (SI), medial-lateral (ML), and anterior-posterior (AP). The radiographs were digitized, background corrected, and uniformly aligned. The Fast Fourier transform (FFT) was performed on a region comprised solely of trabecular bone for each image. The zero (DC), first (FMO), and second moments (SMO) of the Fourier power spectrum and the fractal dimension (FD) as determined from the Fourier power spectrum were correlated with stereology measures, with bone mineral density (BMD) as well as with measured biomechanical properties [Young's elastic modulus (YM) and ultimate strength] of the cubes. The results show that the power spectra-based measures, when compared with structural parameters determined using 3D stereology, show good correlations with bone volume fraction, trabecular spacing, thickness, and number. These power spectral measures showed fair to good correlations with BMD and the biomechanical properties. Moreover, the correlations between the power spectral measures of trabecular structure and the BMD, YM, and stereology measures of structure depend on the orientation of the radiographic image. Specifically, these were significant differences in the measured biomechanical properties and the power spectral measures of the trabecular structure between the SI and ML and the SI and AP directions. In addition, depending on the spatial frequency range for analysis, the fractal dimension showed opposite trends with changes in BMD and biomechanical properties. Multivariate regression models showed the correlation coefficients increasing with the inclusion of some of the power spectral measures, suggesting that FFT-based texture analysis may play a potential role in studies of osteoporosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002239900562
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  • 7
    Electronic Resource
    Electronic Resource
    Medical mycology in India (1960)
    Springer
    Mycopathologia 13 (1960), S. 339-376 
    Details
    ISSN: 1573-0832
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02089932
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  • 8
    Electronic Resource
    Electronic Resource
    Finite transformations of SU(4) (1973)
    Springer
    Czechoslovak journal of physics 23 (1973), S. 1149-1158 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The problem of determining the representation matrices of SU(4) is investigated. A convenient set of parameters is first introduced by writing the general element of the group as a product of exponential functions of the generators, and the generators are expressed as differential operators involving these parameters. Special matrix elements of finite transformations with a SU(3) singlet as the initial state are then obtained by solving the eigenvalue equation of the quadratic Casimir operator of SU(4). The solution has the form of a product of elementary functions and threed m′m j functions of SU(2) and is free from summation over intermediate states. By expanding one of thed m′m j functions in an appropriate series a sum rule for the special matrix elements of the permutation operator 1234→3412 is obtained. The discussions are strictly confined to SU(4), but, some of the results given here can be extended to unitary groups of higher dimensions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01591196
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  • 9
    Electronic Resource
    Electronic Resource
    Canonical forms of the generalized hypergeometric series for the 3j and the 6j symbol (1984)
    Springer
    Czechoslovak journal of physics 34 (1984), S. 15-21 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01590475
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  • 10
    Electronic Resource
    Electronic Resource
    Studies on nutritional and oxygen requirements for production of L-asparaginase by Enterobacter aerogenes (2000)
    Springer
    Applied microbiology and biotechnology 53 (2000), S. 180-184 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The carbon and nitrogen sources most suitable for L-asparaginase production by Enterobacter aerogenes were selected and their concentrations optimized in shake-flask cultures. Sodium citrate (1.0%) and diammonium hydrogen phosphate (0.16%) proved to be the best sources of carbon and nitrogen, respectively. Nitrogen catabolite repression of enzyme formation was absent in this bacterium. Cultivation in a reactor showed that the dissolved oxygen level is the limiting factor for L-asparaginase production by E. aerogenes. Glucose was found to be a repressor of enzyme synthesis. Asparagine was absent intracellularly when the L-asparaginase level was high. An increase in the extracellular alanine level when the dissolved oxygen remained low indicated a shift from aerobic to fermentative metabolism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530050006
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