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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 3229-3233 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Photoacoustic (PA) measurements on some molecular gases, such as air and benzene vapor, have been performed by the microphone method in a wavelength range from 300 to 135 nm using synchrotron radiation as a light source. It was found that the amplitude signals in the region of strong absorptions exhibit the minima, instead of the maxima, corresponding to the absorption maxima. Mechanism by which the absorption maxima are inverted to the amplitude minima was found explicable in terms of the thermal diffusion model similar to one examined by Rosencwaig and Gersho [J. Appl. Phys. 47, 64 (1976)] for analysis of the PA signal from solids. The phase signals were found to yield a spectrum that approximates the absorption spectrum.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 4790-4795 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In many of the results of previous investigations, systematic differences have been observed in the directly measured reflectances of liquid Hg and those calculated from the optical constants determined by ellipsometry. We have performed a comprehensive set of experiments on liquid Hg at room temperature in order to resolve the problem of whether these discrepancies are real. A summary of some of our results have been published [Phys. Rev. B 40, 11994 (1989)]. Here we present a more detailed account of the experimental details and some new results. The spectral range of these experiments was confined to the visible spectral region. Normal-incidence reflectances of liquid Hg under vacuum and in contact with dielectric overlayers were measured. Reflectances of polarized light were measured at a photon angle of incidence of 70° for liquid Hg under vacuum. The optical constants of liquid Hg in contact with various dielectric overlayers were determined by ellipsometry and also by measuring reflectances as a function of angle of photon incidence at a MgF2–Hg interface. The results of the direct reflectance measurements were consistent with the optical properties determined by ellipsometry. No evidence was found for transition layers on the surface of liquid Hg.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Celestial mechanics and dynamical astronomy 54 (1992), S. 275-277 
    ISSN: 1572-9478
    Keywords: Interstellar grains ; organic material
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A number of experimental studies have been carried out to verify the claim that interstellar grains largely consist of organic material, including biological cells. Our spectroscopic studies on biological cells and organic extracts from carbonaceous compounds have failed to identify the well-known 2200 Å interstellar extinction peak with the organic material.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Celestial mechanics and dynamical astronomy 54 (1992), S. 229-231 
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-0533
    Keywords: Granulovacuolar degeneration ; Hippocampus ; Topography ; Aging ; Dementia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The occurrence and topographic analysis of granulovacuolar degeneration (GVD) in the hippocampal cortex of mentally normal controls (75 cases) and patients with Alzheimer's dementia (AD; 17 cases which included Alzheimer's disease and senile dementia of Alzheimer type), multi-infarct dementia (MID; 16 cases), Pick's disease (PD; 5 cases) and atypical dementia [5 cases; non-Alzheimer, non-Pick dementia with Fahr's syndrome (NANPDF)] were investigated. GVD was rarely found in control cases below the age of 60 years. In elderly normal brains, the statistically most representative ranking order of predilection for GVD (in decreasing severity) was: in the 60 s, CA1〉prosubiculum 〉CA2 (no GVD was found in the CA3 and CA4); in the 70 s, CA1〉prosubiculum 〉CA2 〉CA3〉CA4; in the 80 s, CA1〉prosubiculum 〉CA2〉CA3〉CA4; in the 90s, CA1〉prosubiculum 〉CA2〉CA3〉CA4. In the brains of demented patients, the rank order for GVD was: for AD, CA1 〉CA2〉CA3〉 prosubiculum 〉CA4; for MID, CA1 〉 prosubiculum 〉CA2〉CA3〉CA4; for PD, CA1 〉CA2〉CA3〉 prosubiculum 〉CA4; and for atypical dementia (NANPDF), CA1〉CA2〉 prosubiculum 〉CA3〉CA4. The similarity of the predilection to ranking order was noted both in normal aged subjects and in MID as well as both in AD and in PD. The qualitative investigation disclosed that the affected neurons with GVD in the cases of AD were found in all the examined areas outside the hippocampus (gyrus praecentralis, temporal and occipital cortex, globus pallidus, amygdaloid nuclei, mammillary bodies, medial thalamic nuclei, red nuclei, nuclei basalis of Meynert, dentate nuclei and inferior olivary nuclei) and, contrary to the results in AD, there were no affected neurons with GVD in the cases of MID. The occurrence and distribution of GVD in demented patients were different in these respective disorders.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-203X
    Keywords: Key words Albedo ; Flavedo ; Peeling ; Random sequencing ; Satsuma mandarin (Citrus unshiu Marc.)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Changes in mRNA levels for the seven gene homologues to endoxyloglucan transferase-related protein, expansin, extensin, β-1,3 glucanase, glycine-rich protein, pectinacetylesterase and pectinesterase, which were obtained by random sequencing studies, were investigated in relation to rind development in citrus (Citrus unshiu Marc.) fruit. Expression patterns in the albedo and flavedo were classified into four types: Type-I, transcript levels low in early fruit development but increased at the ripening stage; Type-II, transcript levels high until mid-development and then decreased towards ripening; Type-III, detectable transcript limited to fruitlets at 26 days after flowering (DAF); Type-IV, ubiquitous during the development. Based on the expression patterns, we discuss the possible roles of these genes in rind development.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Astrophysics and space science 182 (1991), S. 75-80 
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using the discrete dipole approximation, we have calculated the extinction efficiency of hollow spherical particles of graphite as a possible constituent of interstellar grains. The particles had a shell structure with the basal plane perpendicular to the radius. The calculations were made on the particles having the outer radiusR 0=10 and 5nm in the wave number region from 0.8 to 8.0 μm−1 using the anisotropic optical constants. It was found that the hollow particles with the inner radiusR 1≅0.65R 0 yield an extinction feature at 4.6 μm−1, which fits fairly well to one observed in the interstellar extinction.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Astrophysics and space science 206 (1993), S. 111-117 
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Absorption spectra in the visible to the near ultraviolet were measured on the Belgica chondrite B-7904 in a form of thin solid film made by the vacuum evaporation. The spectra obtained exhibit a sharp peak at 226 nm and a broad bump around 280nm. These features were found arising from the meteorite component FeS (troilite). The peak at 226 nm shows a doublet structure with the band-width considerably narrower than the 217.5 nm feature in the interstellar extinction. The absorption spectra obtained previously with the pulverized chondrites suspended in a liquid were also found reproducible by the pulverized FeS.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Clinical rheumatology 19 (2000), S. 435-441 
    ISSN: 1434-9949
    Keywords: Key words:Anticentromere antibody – Antitopoisomerase I antibody
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract: Some connective tissue diseases are characterised by specific autoantibodies. Although anticentromere or antikinetochore antibodies (ACA), and antitopoisomerase-I or anti-Scl-70 antibodies (ATA), have disease-specific meanings for systemic sclerosis and its CREST variant, respectively, the clinical significance of their concurrent existence has not been clarified. We investigated this condition in our case and with reference to the literature. For this purpose published reports between 1980 and 1998, where both ACA and ATA were measured simultaneously, were analysed by a MEDLINE search. In 10 papers 24 patients had both antibodies. In a further 25 reports, covering 3509 subjects who had either ACA or ATA, no concurrent existence was found. Prevalences of ACA (P(ACA)) and ATA (P(ATA)) in exclusive cases varied from 8.8% to 54.5%, and from 11.8% to 87.5%, respectively, whereas P(ACA) varied from 20.0% to 56.6%, and P(ATA) from 16.8% to 63.7% in the reports with patients positive for both. The actual prevalence of simultaneous presence was between 0.7% and 5.6%, significantly lower than the expected probabilities if both antibodies were to occur independently (p〈0.005). In concurrently positive cases visceral involvement was characteristic, especially affecting the vascular system, with deterioration of oesophageal function and cutaneous lesions. We suggest that ATA and ACA do not coexist by chance, and that clinical characteristics with coexistence have a significance for the classification of scleroderma.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A variety of spray pyrolysis (SP) techniques have been developed to directly produce ceramic powders from solutions. Examples that are discussed include the following powders: (La0.8Sr0.2)0.9MnO3-YSZ (La(Sr)MnO3-YSZ), La0.6Sr0.4CoO3 (La(Sr)CoO3), (CeO2)0.8(SmO1.5)0.2-NiO (SDC-NiO) and La0.9Sr0.1Ga0.8Mg0.2O3-NiO (LSGM-NiO). For all these powders, spherical, non-agglomerated, submicrometer particles were obtained from aqueous solution of metal salts into a furnace using an ultrasonic atomizer at 1.7 MHz. After SP some of the particles exhibit a hollow-shell morphology. Subsequent calcination at 1000°C yielded crystalline particles. The electrical performance of Ni-SDC/LSGM/La(Sr)CoO3 fuel cells operating at 800°C, prepared from the powders obtained by SP, is reported.
    Type of Medium: Electronic Resource
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