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  • 1
    Electronic Resource
    Electronic Resource
    Electrical properties of Nd1.85Ce0.15CuO4−y at high temperatures (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4159-4160 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The temperature dependence of electrical resistivity of Nd1.85Ce0.15CuO4−y was measured with oxygen partial pressure fixed at 2.08×10−1, 1.8×10−2, 8.1×10−4, and 3.3×10−6 atm. The oxygen partial pressure dependence of resistivity indicated that the charge carriers in Nd1.85Ce0.15CuO4−y were electrons. The temperature dependence of resistivity exhibited a linear metallic behavior at high temperatures and a semiconductorlike behavior at low temperatures, having a minimum at an intermediate temperature. Difficulties are pointed out in obtaining a unified view for the mechanism of normal electrical conduction in Nd1.85Ce0.15CuO4−y .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344978
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  • 2
    Electronic Resource
    Electronic Resource
    Determination of effective energy loss functions and x-ray photoelectron spectroscopy source functions for Si 2p photoelectrons from clean Si(111), oxygen-adsorbed Si(111) and SiO2 surfaces (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 8016-8026 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Effective energy loss functions for Si 2p photoelectrons were determined for the thermally cleaned Si(111), oxygen-adsorbed Si(111) and SiO2 surfaces by the analysis of the reflection electron energy loss spectroscopy (REELS) spectra using the extended Landau theory. The background subtraction of the Si 2p x-ray photoelectron spectroscopy (XPS) spectra using these effective energy loss functions has enabled the XPS source functions to be derived with considerable effectiveness. This result has indicated that the effective energy loss functions derived for the clean Si(111) surface are significantly affected by the oxygen adsorption and the XPS source functions from the clean and oxygen-adsorbed Si(111) surfaces show a small hump due to the chemical shift by the oxygen adsorption appearing at the tail of the lower kinetic energy side of the Si 2p peak from the oxygen-adsorbed Si surface. On the SiO2 surface, the analysis of the REELS spectrum has yielded the effective energy loss function reflecting the fine structures which were not as clearly observed in the measured REELS spectrum. The Si 2p XPS source function determined for the SiO2 surface at two different measuring geometries showed very good agreement with each other. This study strongly suggests that the present analysis is very informative for the study of the initial oxidation of the silicon surface. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367894
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  • 3
    Electronic Resource
    Electronic Resource
    Characterization of the progressive sublines derived from a weakly malignant cloned cell line, ER-1, co-inoculated subcutaneously with a foreign body (1998)
    Springer
    Clinical & experimental metastasis 16 (1998), S. 291-298 
    Details
    ISSN: 1573-7276
    Keywords: in vitro invasion ; malignant progression ; rat mammary carcinoma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We previously established an experimental model of tumor progression using a weakly malignant rat mammary carcinoma cell line, ER-1. Using this model, we demonstrated that ER-1 cells converted into highly tumorigenic and metastatic cells, ERpP, by s.c. co-inoculation with plastic plates. We here compared in vitro biological properties associated with malignancy of ER-1 cells with those of ERpP cells which were highly malignant when inoculated into syngeneic rats. In vitro growth rate of ERpP cells was higher than that of ER-1 cells under a low nutrient condition. Invasion capacity of ERpP cells to rat lung endothelial cell monolayer or reconstituted basement membrane, Matrigel, was higher than that of ER-1 cells. Migration of ERpP cells toward fibronectin or laminin was also significantly higher than that of ER-1 cells.There was no difference in gelatinolytic or plasminogen activator activity detected in conditioned media between ER-1 and ERpP cells. Furthermore, we found that ER-1 cells communicated better among themselves and with normal fibroblasts through gap junctions compared to ERpP cells. These results suggest that growth advan-tage in a poor nutrient condition, enhancement of cell motility, and loss or decrease of junctional communication may be associated with tumor progression of ER-1 cells. © Rapid Science 1998
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006505211766
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