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  • 1
    Electronic Resource
    Electronic Resource
    Orientation control of ex situ (Hg1−xRex)Ba2CaCu2Oy (x(approximate)0.1) thin films on LaAlO3 (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 972-974 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: (Hg1−xRex)Ba2CaCu2Oy (x(approximate)0.1) thin films have been prepared ex situ on LaAlO3 substrates by a two-step process in which an HgO/Re0.1Ba2CaCu2Oy multilayer precursor film is annealed in a quartz tube using an unreacted monoxide pellet containing HgO as an Hg vapor source. By varying the composition of the monoxide pellet, the film orientation can be changed from c-axis to the predominantly a-axis one. The a-axis growth of the grains directly on the substrate is confirmed by x-ray diffraction and transmission electron microscopic observation, although the grains are twinned with 90° orientation. The a-axis films exhibit a Tc onset and Tc zero of approximately 110–127 and 55 K, respectively, suggesting substantial influence of weak links at the grain boundaries on their transport properties. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120613
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  • 2
    Electronic Resource
    Electronic Resource
    Expression of bcl-2 oncoprotein in transitional cell carcinoma of the upper urinary tract (1998)
    Springer
    Virchows Archiv 432 (1998), S. 445-450 
    Details
    ISSN: 1432-2307
    Keywords: Key words Transitional cell carcinoma ; Upper urinary tract ; bcl-2 Oncoprotein
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  We investigated the immunoreactivity for bcl-2 oncoprotein in 154 cases of transitional cell carcinoma of the upper urinary tract (TCC-UUT) and its relation with the immunoreactivity for p53 oncoprotein and proliferating cell nuclear antigen (PCNA) immunoreactivity. Immunohistochemically, bcl-2 oncoprotein was recognized as positive in 29.2% of the samples. The immunoreactivity for bcl-2 oncoprotein was significantly (P 〈 0.05) correlated only with stage, though there was a borderline correlation (P = 0.050) with PCNA immunoreactivity. Furthermore, in invasive TCC the immunoreactivity for bcl-2 oncoprotein was associated with PCNA immunoreactivity (P 〈 0.041). The 5-year disease-free and overall survival rates were 55.7% and 71.5%, respectively. A univariate analysis of survival revealed that stage, grade, pattern of growth, immunoreactivity for p53 oncoprotein, and PCNA immunoreactivity each had a significant effect on disease-free and overall survival rates, whereas the immunoreactivity for bcl-2 oncoprotein had no significant effect on either rate. In the final models of the multivariate analysis, stage was found to be the only prognostic factor for disease-free survival and for overall survival. Detection of immunoreactivity for bcl-2 oncoprotein appears to be of no real value in deciding the prognosis of TCC-UUT.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004280050189
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  • 3
    Electronic Resource
    Electronic Resource
    Alveolar soft part sarcoma (1998)
    Springer
    European radiology 8 (1998), S. 813-816 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Alveolar soft part sarcoma ; Soft tissue tumors ; Lung metastases ; Neoplasm ; Therapeutic radiology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. We report a case of alveolar soft part sarcoma (ASPS) of the thigh with lung metastases in a 22-year-old woman. The findings of digital subtraction angiography (DSA) and MRI contributed to the diagnosis of ASPS. Especially dynamic contrast-enhanced MRI was useful for evaluating the effect of chemoembolotherapy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300050477
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  • 4
    Electronic Resource
    Electronic Resource
    Structure Design of Double-Pore Silica and Its Application to HPLC (1998)
    Springer
    Journal of sol gel science and technology 13 (1998), S. 163-169 
    Details
    ISSN: 1573-4846
    Keywords: silica gels ; phase separation ; pore size distribution ; liquid chromatography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Utilizing the concurrence of polymerization-induced phase separation and sol-gel transition in the hydrolytic polycondensation of alkoxysilanes, a well-defined macroporous structure is formed in a monolithic wet gel. By exchanging the fluid phase of the wet gel with an appropriate external solution, the nanometer-range structure of the wet gel can be reorganized into structures with larger median pore size essentially without affecting the macroporous framework. The double-pore structure thus prepared is characterized by open pores distributed in discrete size ranges of micrometers and nanometers. A new type of chromatographic column (silica rod) has been developed using monolithic double-pore silica instead of packed spherical gel particles. Typical silica rod columns had significantly reduced pressure drops and improved analytical efficiencies which do not deteriorate even at higher sample flow rates, both arising from a greater macropore volume than particle packed columns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008644514849
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  • 5
    Electronic Resource
    Electronic Resource
    Apatite formation on silica gel in simulated body fluid: effects of structural modification with solvent-exchange (1998)
    Springer
    Journal of materials science 9 (1998), S. 279-284 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract The prerequisite for glasses and glass-ceramics to bond to living bone is the formation of biologically active bone-like apatite on their surfaces. It has been shown that even a pure silica gel forms the bone-like apatite on its surface in a simulated body fluid. In the present study, pore structure of silica gels prepared by hydrolysis and polycondensation of tetraethoxysilane in an aqueous solution containing polyethylene glycol was modified by 1M HNO3, and 0.1M and 1M NH4OH solution treatments. The three kinds of resultant gels all contained large amounts of silanol groups and trisiloxane rings, but differ greatly in pore structure of nanometre pore size. Irrespective of these differences, all the gels formed the bone-like apatite on their surface in the simulated body fluid. It was speculated that a certain type of structural unit of silanol groups, which is easily formed in the presence of the polyethylene glycol, is effective for the apatite formation. © 1998 Chapman & Hall
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008808828567
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  • 6
    Electronic Resource
    Electronic Resource
    Tissue factor is associated with the nonbacterial thrombotic endocarditis induced by a hypobaric hypoxic environment in rats (1998)
    Springer
    Virchows Archiv 433 (1998), S. 375-379 
    Details
    ISSN: 1432-2307
    Keywords: Key words Cardiovascular disease ; Coagulation ; Hypoxia ; Thrombosis ; Valves
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  High-altitude hypoxia causes a hypercoagulable state. In our previous study on the blood coagulation system in rats, nonbacterial thrombotic endocarditis (NBTE) developed after 4–12 weeks’ exposure to the equivalent of 5500 m in altitude. We hypothesized that TF (tissue factor)-producing cells in the cardiac valves might be induced by the hypobaric hypoxic environment (HHE) and then trigger NBTE. A total of 170 male Wistar rats were housed in a chamber at the equivalent of 5500 m altitude for 1–12 weeks. We measured TF activity in the plasma and studied morphological changes in the mitral valves using immunohistochemical and immunoelectrical methods for TF protein and in situ hybridization for TF mRNA. After 4 weeks or more of exposure to HHE, 28 of the 56 surviving rats had developed NBTE. After 4–8 weeks’ exposure to HHE, the plasma TF activity level was significantly higher than in control rats. There was a significant correlation between plasma TF activity and the incidence of NBTE. After 1 weeks’ exposure to HHE, immunoreactivity for TF protein was detected in foamy macrophages and stromal cells in the cardiac valves. In rats with NBTE, TF protein was present in foamy macrophages and spindle stromal cells and focally present in the extracellular matrix. TF mRNA was detected in some foamy macrophages within the thrombus, TF protein was localized to the rough endoplasmic reticulum and plasma membrane of many macrophages, some fibroblasts, and a few endocardial cells. TF is associated with the pathogenesis of the NBTE induced by exposure to HHE. The accumulation of TF-producing macrophages during exposure to HHE may be responsible for initiating thrombus formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004280050262
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