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  • Conference proceedings  (179)
  • Column liquid chromatography  (95)
  • Immunocytochemistry  (77)
  • Springer  (351)
  • American Chemical Society (ACS)
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  • American Institute of Physics
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  • 1990-1994  (351)
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  • Springer  (351)
  • American Chemical Society (ACS)
  • American Geophysical Union
  • American Institute of Physics
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  • 2015-2019
  • 2005-2009
  • 1990-1994  (351)
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  • 1
    Digitale Medien
    Digitale Medien
    Effects of aflatoxin B1 on in vitro cultures ofNicotiana tabacum var. Samsun (1994)
    Springer
    Mycopathologia 125 (1994), S. 107-117 
    Details
    ISSN: 1573-0832
    Schlagwort(e): Aflatoxin B1 ; Immunocytochemistry ; Regeneration ; Tissue culture ; Tobacco plantlets
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract The effects of aflatoxin B1, (0.5–25 µg ml−1) on in vitro root and shoot development in young tobacco explants were investigated. Despite an initial apparent stimulatory effect on most measured parameters at 0.5 µg ml−1 AFB1, the number of leaves, root and leaf mass per plantlet were progressively inhibited with increasing AFB1 concentration. The number of explants developing roots was reduced to 34% at the highest (25 µg ml−1) AFB1 concentration, following 3 weeks exposure to the toxin. Leaf chlorophyll content at this toxin concentration was significantly lower than that measured for control plantlets. Thin layer chromatography confirmed the absorption of AFB1 by the plantlets. Using immunocytochemical techniques, AFB1 was immunolocated predominantly in the vacuoles, the nucleus and the cytoplasm (possibly intravesicularly). The results are discussed in terms of this immunolocation within the cell.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01371099
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  • 2
    Digitale Medien
    Digitale Medien
    Preparation and analysis of electronic-transport properties of BSCCO-2223 platelets (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 1715-1721 
    Details
    ISSN: 0392-6737
    Schlagwort(e): Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.) ; Flux pinning ; flux motion ; fluxon-defect interactions ; Conference proceedings
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Summary High-quality single-phase thin platelets of BSCCO-2223 have been produced by a novel method on thermal-gradient-enhanced KCl flux which allows the growth of the 2223-phase in an extremely short time interval compared to those reported in the literature. In-plane electrical resistivity measurements in zero applied magnetic field have been performed. Experimental data have been analysed and interpreted within the Aslamazov-Larkin theory of amplitude fluctuations and the Ginzburg-Landau Coulomb gas model of phase fluctuations. These theories seem to fit in a very reliable way the experimentalR(T) curves.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02462165
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  • 3
    Digitale Medien
    Digitale Medien
    High critical temperature by resonant quantum confinement: Evidence for polarons ordering atT*≈1.5T c in Bi-2212 and La-214 by EXAFS (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 1815-1820 
    Details
    ISSN: 0392-6737
    Schlagwort(e): Insulator-superconductor transitions ; unconventional mechanisms of high-T c superconductivity ; Other topics in superconductivity ; Conference proceedings
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Summary The temperature dependence of local Cu site conformations in single-domain crystals of Bi2Sr2CaCu2O8+y (Bi-2212) and La1.85Sr0.15CuO4 (La-214) has been determined by EXAFS (Extended X-ray Absorption Fine Structure), a fast (10−15 s) and local probe. Two sets of Cu site conformations characterized by the Cu−O(apical) bond distances and tilting of copper square plane have been found atT〈T*∼1.5T c . The difference between the long and short Cu−O(apical) distance appeared to be 0.17 Å and 0.12 Å atT〈T* in Bi-2212 and La-214 systems, respectively. The polarons are associated with the short Cu−O(apical) bond distance. The ratio between the number of short and the total number of Cu−O(apical) bonds (N short/N tot∼0.42 in both systems) is a measure of the relative area of distorted and undistorted domains. By using this result we have been able to show the polaronic nature of the one-dimensional structural anharmonic modulation of the CuO2 plane in Bi-2212 where the polarons have dimensionW=(11±1) Å atT〈T*≈1.4T c and are condensed into a one-dimensional generalized Wigner charge density wave (CDW). It appears that superconductivity is stabilized at thigh temperature by resonant quantum confinement in a superlattice of stripe widthL wherek Fx ∼k Fy ∼π/L.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02462179
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  • 4
    Digitale Medien
    Digitale Medien
    Influence of thermal treatment and oxygen stoichiometry on paraconductivity of YBa2Cu3O7−δ pellets (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 1843-1849 
    Details
    ISSN: 0392-6737
    Schlagwort(e): Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.) ; Conference proceedings
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Summary This work is focused on how oxygen stoichiometry and distribution affects the pretransitional region in YBa2Cu3O7−δ pellets prepared by different thermal treatments starting from the same batch with oxygen content 6.94. We find that slightly deoxygenated samples, which show higherT c and narrower transition than the starting material, also exhibit a more pronounced rounding of the resistivity extending towards higher temperatures. We analyse the presence and the extension of regions with different power law behaviour of excess conductivityvs. temperature.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02462183
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  • 5
    Digitale Medien
    Digitale Medien
    Magnetic characterization of hot-pressed BSCCO (2223) phase superconducting ceramic (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 1871-1876 
    Details
    ISSN: 0392-6737
    Schlagwort(e): Magnetization curves ; Meissner effect ; penetration depth ; Critical currents ; Conference proceedings
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Summary BSCCO (2223) phase superconductor, prepared by the traditional solid-state reaction route, was densified by hot pressing, yielding high-density and textured-bulk materials. A correlation between processing parameters and inter-, intra-granular properties of the sample was performed through the evaluation of microstructural features and the study of electrical resistivity and magnetization behaviour as a function of different temperature and magnetic field.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02462187
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  • 6
    Digitale Medien
    Digitale Medien
    Flux motion by quantum tunnelling in high-T c superconductors (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 1925-1932 
    Details
    ISSN: 0392-6737
    Schlagwort(e): Flux pinning ; flux motion ; fluxon-defect interactions ; Critical currents ; Conference proceedings
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Summary The results of low-temperature magnetic-relaxation experiments in TlBaCaCuO superconductors (2212 and 2223 phase) are reported. They give evidence of a crossover from a thermally activated regime of flux motion to a nonthermally activated one. The magnetic-relaxation rate is found to become temperature independent below ≅7K and ≅3K, for the 2212 and 2223 phase, respectively. Its value compares well with that predicted by the theories of flux motion by quantum tunnelling.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02462195
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  • 7
    Digitale Medien
    Digitale Medien
    Fluxon dynamics and higher harmonics of a.c. susceptibility in HTSC (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 1917-1924 
    Details
    ISSN: 0392-6737
    Schlagwort(e): Flux pinning ; flux motion ; fluxon-defect interactions ; Conference proceedings
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Summary Measurements of fundamental and higher harmonics of a.c. susceptibility on polycrystalline high-T c superconductors were carried out using a new method, involving a 2-channel dynamic analyser, allowing 20 harmonics in phase and out of phase to be measured at the same time. The critical-state model, used for describing the higher-harmonics dependence on temperature at fixed d.c. and a.c. magnetic fields, did not explain the experimental results. A frequency analysis indeed suggested that an effect of the fluxon dynamics takes place. Simple considerations lead to the conclusion that really Thermally Activated Flux Flow (TAFF), Flux Creep (FC) and Flux Flow (FF) would have a big role in determining the higher harmonics of a.c. susceptibility. Measurements on low-T c superconductors showed the occurrence of the same effect.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02462194
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Modulation of HTSC characteristics induced by proton irradiation (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 1933-1939 
    Details
    ISSN: 0392-6737
    Schlagwort(e): Flux pinning, flux creep, and flux-line lattice dynamics ; Critical currents ; Material effects onT c, κ, critical currents (including impurities, ion implantation, etc.) ; Conference proceedings
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Summary Bulk slabs of sintered YBCO were irradiated with monoenergetic protons at different energies (3.5 and 6.5 MeV) and different fluences, ranging from 1.8·1016 to 8.6·1016 p/cm2. The effects on intergrain critical currents of protons crossing the sample and the effects of protons implanting in the specimen, has been studied by means of a.c. susceptibility characterizations. D.c. hysteresis cycles were measured in low fields in order to investigate the modifications in the intergrain critical current density due to proton implantation. The main result is the evidence that the intergrainJ c response to the applied field can be modulated by means of the proton irradiation. Resistive measurements were also performed in order to investigate the complex transport phenomena in polycrystalline materials. Irradiation-induced effects on both superconducting- and normal-state resistivity are studied. The addition of extrinsic defects can lead to enhanced transport properties, emerging especially when a magnetic field is applied.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02462196
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  • 9
    Digitale Medien
    Digitale Medien
    Problems in the low-temperature synthesis of 92K Superconducting YBCO (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 1671-1678 
    Details
    ISSN: 0392-6737
    Schlagwort(e): Effects of material synthesis ; crystal structure ; chemical composition ; Y-based compounds ; Conference proceedings
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Summary YBCO with high granulometric perfection and low dispersion can be obtained by a low-temperature reaction (≈800°C) of atomic-scale dispersed powders, produced through the thermal decomposition of liquid precursors. As reacted such powders are tetragonal and not superconducting, but they transform into the high-T c phase after optimized annealing treatments. We describe the method we developed and the characteristics of the materials we achieved, and we discuss the main features of the process in the light of the current know-how.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02462158
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  • 10
    Digitale Medien
    Digitale Medien
    High-quality YBCO d.c. SQUIDs based on bicrystal substrates (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 2019-2024 
    Details
    ISSN: 0392-6737
    Schlagwort(e): Proximity effects, tunneling phenomena, and Josephson effects ; Conference proceedings
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Summary An analysis of superconducting transport properties and magnetic behaviour of d.c. SQUIDs employing YBCO bicrystal grain boundary junctions (GBJs) has been performed. GBJs have been obtained by deposition of ac-axis-oriented YBCO film on a SrTiO3 bicrystal substrate by ICM sputtering technique. Experimental measurements on a YBCO d.c. SQUID with a misorientation angle θ=20° are reported. The SQUID shows a critical temperatureT c∼89 K and a high critical current densityJ c∼3·106 A/cm2 atT=4.2 K. Current-voltage characteristics are close to the behaviour predicted by the resistively shunted junction (RSJ) model and the temperature dependenceJ c(T) shows a linear behaviour at small reduced temperatures and a depressedJ c value close toT c. High-quality flux-voltage curves have been found upT=87 K over a large range of magnetic field. The high reproducibility and the good control of transport properties by the variation of θ make YBCO bicrystal GBJs very useful for applications in electronics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02471861
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