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  • Electronic Resource  (7)
  • 2000-2004  (7)
  • 2000  (7)
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  • Electronic Resource  (7)
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  • 2000-2004  (7)
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  • 1
    Electronic Resource
    Electronic Resource
    Three-configurational surface magneto-optical Kerr effect measurement system for an ultrahigh vacuum in situ study of ultrathin magnetic films (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 3801-3805 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have constructed a three-configurational surface magneto-optical Kerr effect system, which provides the simultaneous measurements of the "polar," "longitudinal," and "transverse" Kerr hysteresis loops at the position where deposition is carried out in an ultrahigh vacuum growth chamber. The present system enables in situ three-dimensional vectorial studies of ultrathin film magnetism with a submonolayer sensitivity. We present three-configurational hysteresis loops measured during the growth of Co films on Pd(111), glass, and Pd/glass substrates. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1310346
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  • 2
    Electronic Resource
    Electronic Resource
    Formation of icosahedral phase from amorphous Zr65Al7.5Cu12.5Ni10Ag5 alloys (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 978-980 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The kinetic behavior of quasicrystalline phase formation in amorphous Zr65Al7.5Cu12.5Ni10Ag5 alloys has been studied by using differential scanning calorimetry (DSC), x-ray diffractometry, and transmission electron microscopy. DSC trace obtained during continuous heating from 473 to 873 K shows two distinct exotherms with peak temperatures of 727 and 776 K. The first and second exothermic reactions, respectively, correspond to the formation of quasicrystalline phase from the amorphous matrix and the formation of tetragonal CuZr2 and hexagonal Zr6NiAl2 phases from the previously formed quasicrystalline phase. Partial replacement of Cu by Ag enhanced the formation of quasicrystalline phase from the amorphous structure. Johnson–Mehl–Avrami analysis of isothermal transformation data suggests that the formation of quasicrystalline phase is not entirely polymorphic in nature and may involve partitioning of solute at a later stage. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1289069
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of columnar defects in YBa2Cu3O7−x ramp-edge Josephson junctions (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 3239-3241 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We investigated the transport properties in YBa2Cu3O7−x (YBCO) ramp-edge Josephson junctions before and after 1.3 GeV Pb-ion irradiation. The barrier of the junctions was formed by structural modification of the ramp-edge surface of the YBCO base electrode. After a dose of ∼2×1010 Pb ions/cm2, both critical current and normal resistance of the junctions increased by ∼30% and 10%, respectively, except near the transition temperature. We interpret such an enhancement of the critical current as a result of impeding Josephson vortex motion by pinned magnetic flux in the electrodes. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1325403
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  • 4
    Electronic Resource
    Electronic Resource
    Caspase-3/CPP32 immunoreactivity and its correlation with frequency of apoptotic bodies in human prostatic carcinomas and benign nodular hyperplasias (2000)
    Oxford, UK : Blackwell Science Ltd
    Histopathology 37 (2000), S. 0 
    Details
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Apoptosis is mediated by apoptosis-specific genes, certain oncogenes and tumour suppressor genes. Caspase-3, a group of cystein proteases, is involved in the induction of apoptosis and has been considered to correlate with apoptosis. The aim of this study was to determine whether caspase-3 is expressed in prostatic carcinoma and benign prostatic hyperplasia, and correlated with the apoptosis.We studied the apoptotic index and caspase-3 immunoreactivity in 40 cases of benign nodular hyperplasia (BPH) and 40 cases of prostate carcinoma (PCA) by in-situ labelling and immunohistochemistry. The mean number of apoptotic bodies in cases with BPH was not significantly different from cases with PCA I (Gleason score 2–4), but samples from patients with PCA II (Gleason score 5–7) and PCA III (Gleason score 8–10) showed a significantly higher apoptotic number than cases with BPH. Positive staining for caspase-3 was seen in 42.5% (17/40) of the BPH, and 27.5% (11/40) of the PCA: PCA I was 41.7% (5/12), PCA II 14.3% (2/14) and PCA III was 28.6% (4/14).Based on our results, the number of apoptotic bodies was not correlated with the caspase-3 expression and there was no relationship between caspase-3 expression and Gleason score. However, the number of apoptotic bodies was significantly higher in cases with intermediate (Gleason score 5–7) and high-grade (Gleason score 8–10) PCAs than cases with BPH and low-grade PCAs (Gleason score 2–4).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2559.2000.01062.x
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  • 5
    Electronic Resource
    Electronic Resource
    Single-frame (two-field image) 3-D PTV for high speed flows (2000)
    Springer
    Experiments in fluids 29 (2000), S. S085 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A single-frame 3-D PTV algorithm was constructed to measure 3-D high-speed flows with NTSC cameras. The measurement system consists of three NTSC cameras, an optical instrument called AOM, a digital image grabber and a hosting computer. The tracking algorithm of particles' pair is based on a concept of a spatial match probability. The measurement system is used to probe the turbulent properties of the backward-facing step flow. A preliminary test of the measurement system is also made on the measurement of 3-D vectors of 36 targets on a rotating table to verify its validity. The measurement uncertainty of the system is systematically evaluated through the preliminary test. A set of virtual images is constructed by using the vectors selected randomly from the grid vectors that had been obtained by the experiment on the backward-facing step flow with the system. A performance test is made on the vector recovery using the virtual images and it is validated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003480070011
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  • 6
    Electronic Resource
    Electronic Resource
    Dynamic changes in sarcoplasmic reticulum function in cardiac hypertrophy and failure (2000)
    Springer
    Pflügers Archiv 439 (2000), S. 339-348 
    Details
    ISSN: 1432-2013
    Keywords: Sarcoplasmic reticulum Ca2+ uptake Ca2+ release Heart failure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Previous studies have demonstrated that cardiac function changes with development of pressure overload-induced hypertrophy. The present study was undertaken to discover the basis for the changes in sarcoplasmic reticulum (SR) functions: uptake, (as related to the SR Ca2+ pump properties) and release in isolated, perfused hypertrophied rat hearts. Our results demonstrated significant prolongation of the time-to-90%-relaxation, both during the period of compensation (8 weeks after banding the ascending aorta, group HR1), when systolic function was preserved, and later with progressive hypertrophy (20 weeks after banding, group HR2) and contractile failure (20–22 weeks after banding, group F). The initial rates of the oxalate-supported SR Ca2+ uptake and the maximum transport rate (V max) of the SR Ca2+ pump, measured in the left ventricular homogenates, during blockade of the SR Ca2+ release channels with ruthenium red, were preserved in group HR1. To correlate early relaxation abnormalities with SR function, the [Ca2+] required for half-maximal pump activation (EC50) was examined and increased significantly in HR1 vs. Sham1 (0.95±0.06 vs. 0.81±0.04 µM, P〈0.05) indicating that the affinity of the SR Ca2+ pump for Ca2+ was reduced. The same tendency was demonstrated in groups HR2 (0.94±0.06 vs. 0.79±0.05) and F (0.89±0.05 vs. 0.78±0.05). In addition, with progression of hypertrophy we observed a significant decline in the amount of SR Ca2+ pump, as assessed by the V max, from 31.22±1.20 (Sham2) to 26.47±1.58 HR2) nmol/mg protein per min (P〈0.05), and from 33.81±1.23 (Sham3) to 25.15±1.57 (F) nmol/mg protein per min, (P〈0.01). This decrease was accompanied by a parallel reduction in the number of SR Ca2+ release channels by 14% (HR2) and 23% (F), as determined by maximum [3H] ryanodine binding (B max). These results suggest that pressure overload-induced changes in SR Ca2+ uptake (as reflected by V max and EC50) and SR Ca2+ release (as reflected by B max), both leading to diminished Ca2+ sequestration, may contribute to impaired cardiac relaxation with compensatory hypertrophy and failure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004249900097
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  • 7
    Electronic Resource
    Electronic Resource
    Possibilities of producing single phase kilogram scale Al70Ni13Co13Si4 alloy by conventional casting (2000)
    Springer
    Journal of materials science 19 (2000), S. 363-365 
    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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006766016202
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    Paper (German National Licenses)
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