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  • 2000-2004  (16)
  • 1985-1989  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Extracellular proteinase production and the pathogenicity of Nocardiae (1989)
    Springer
    Archives of dermatological research 281 (1989), S. 78-80 
    Details
    ISSN: 1432-069X
    Keywords: Extracellular proteinase ; Nocardiae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00424279
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  • 2
    Electronic Resource
    Electronic Resource
    Correlation between culture medium pH, extracellular proteinase activity, and cell growth of Candida albicans in insoluble stratum corneum-supplemented media (1989)
    Springer
    Archives of dermatological research 281 (1989), S. 342-345 
    Details
    ISSN: 1432-069X
    Keywords: Candida albicans ; Extracellular proteinase ; Medium pH
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Candida albicans produces a major extracellular proteinase whose activities are observed only in weakly acidic pH. However, in affected lesions, a variety of pH conditions exist, including neutral pH. To verify the pathological importance of the extracellular proteinase, the correlation between culture medium pH, extracellular proteinase activity, and cell growth of C. albicans was followed for 3 weeks with unbuffered and insoluble stratum corneum-supplemented liquid media. Each medium pH, initially adjusted within a range of pH 3–7 by the addition of sodium hydroxide or hydrochloric acid solution, was acidified, and a subsequent high proteolytic activity and rapid fungal growth were observed. After full fungal growth, neutralization of each medium to pH 7 and reduction of proteinase activity occurred. Results from a glucose addition experiment suggest that acidification of each medium was produced by the acid formation from glucose and neutralization by the exhaustion of glucose and increase of ammonia from denatured stratum corneum. These data suggest that extracellular proteinase from C. albicans could act as a virulence factor under a wide range of pH conditions by the acidification of the environmental pH close to the organism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00412979
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  • 3
    Electronic Resource
    Electronic Resource
    Probing bulk states of correlated electron systems by high-resolution resonance photoemission (2000)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 403 (2000), S. 396-398 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Electron correlations are known to play an important role in determining the unusual physical properties of a variety of compounds. Such properties include high-temperature superconductivity, heavy fermion behaviour and metal-to-insulator transitions. High-resolution photoelectron spectroscopy ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35000140
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of oxygen on the corrosion of dental amalgam (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 12 (1985), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The anodic and cathodic polarization of five dental amalgams were determined as a function of oxygen concentration in Ringer's solution and artificial saliva. The results indicate an anodic polarization behaviour dependent on Cl ion concentration and a corrosion potential determined primarily by oxygen concentration. At high oxygen concentrations the corrosion rates of traditional and copper enriched amalgams were equivalent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1985.tb00629.x
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  • 5
    Electronic Resource
    Electronic Resource
    Low resistance magnetic tunnel junctions and their interface structures (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 7558-7560 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Effects of interface structure and oxidation state were studied in stacked magnetic tunnel junction (MTJ) structures with top and bottom antiferromagnetic layers to obtain optimum resistance and high tunneling magnetoresistance (TMR) ratios for read heads. The roughness of the NiFe surface and the Al coverage were significantly improved by introduction of O2 surfactant gas on the Ta-seed-layer surface, which increased TMR ratios of the MTJ with low resistance area (RA) products of less than 10 Ω μm2. Furthermore, it was found that avoidance of Ni oxidation and Co oxidation at the tunnel barrier interface is essential to obtaining high TMR ratios, and that a good Al coverage and Fe–oxide formation may enhance TMR ratios when Fe-rich magnetic materials are used. For the top-type and bottom-type structures, a TMR ratio of 12%–17% with RA products of 6–7 Ω μm2 was obtained, which provides sufficient performance for read heads. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1361054
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  • 6
    Electronic Resource
    Electronic Resource
    Formation of MnSb during the growth of MnSi layers in the presence of an Sb flux (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 4932-4935 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Structural and compositional analyses of a MnSi layer have been performed to elucidate the growth mechanism. The MnSi layer was grown by reactive deposition epitaxy in the presence of an Sb flux. The existence of Sb was found at the MnSi/Si interface and on the surface of MnSi layer by secondary ion mass spectrometry. In addition, x-ray photoelectron spectroscopy measurement shows that MnSb is formed on the surface of the grown MnSi layer. On the atomic scale, scanning transmission electron microscopy observations reveal the existence of an Sb–Mn–Sb structure at the interface between the MnSi layer and the Si substrate. The formation of the MnSb plays an important role for the improvement of crystalline quality of the silicide layer, acting both as a surfactant and as a compliant substrate for stress relief. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1461063
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  • 7
    Electronic Resource
    Electronic Resource
    Near-field photoluminescence study of GaNAs alloy epilayer at room and cryogenic temperature (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 1508-1510 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have measured the spatial distribution of the optical properties of a GaNAs (N∼0.8%) epilayer to investigate the carrier recombination mechanism at both room temperature and cryogenic temperature using a near-field scanning optical microscope. A difference between the macro and near-field photoluminescence (PL) spectra at room temperature was not observed. At low temperature, we found spatial inhomogeneity of the optical properties and sharp features in the near-field PL spectrum. These findings indicate that the dominant emission mechanism changes from recombination of delocalized carriers at room temperature to recombination of localized carriers (excitons) trapped in the local potential minimum due to compositional fluctuation at low temperature. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1353815
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  • 8
    Electronic Resource
    Electronic Resource
    Reduced magnetoresistance in magnetic tunnel junctions caused by geometrical artifacts (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 3060-3062 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Spuriously reduced magnetoresistance (MR) ratios have been observed in magnetic tunnel junctions in which a square contact portion with dimensions smaller than the width of the lead electrodes connects both the top and bottom lead electrodes. The phenomenon becomes apparent by measuring the magnetoresistance of the junctions with various sizes systematically varied under a fixed line width of the electrodes. Observed junction size dependence of resistance (R)×area(A) products and MR ratios were analyzed through finite difference calculation, and it was found that there exist junction sizes for which R×A products and MR ratios are larger and smaller, respectively, than the intrinsic ones. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1323740
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  • 9
    Electronic Resource
    Electronic Resource
    Room-temperature photoluminescence spectroscopy of self-assembled In0.5Ga0.5As single quantum dots by using highly sensitive near-field scanning optical microscope (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 73-75 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied the optical properties of self-assembled In0.5Ga0.5As single quantum dots (QDs) at room temperature with a near-field scanning optical microscope. Successful detection of a weak photoluminescence (PL) signal from a single QD at room temperature could be achieved by using a double-tapered fiber probe having the advantages of both high collection efficiency and high spatial resolution. Through the precise examination of PL spectra of many QDs, including broadening and saturation behaviors, the homogeneous linewidth of the ground state emission is evaluated as from 9.8 to 14.5 meV. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125660
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  • 10
    Electronic Resource
    Electronic Resource
    Polyribosome metabolism, growth and water status in the growing tissues of osmotically stressed plant seedlings (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 64 (1985), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Relationships between growth of osmotically stressed intact seedlings and polyribosome levels and water status of growing tissues were examined. Sudden exposure of barley (Hordeum vulgare L. cv. Arivat) roots to a solution of −0.8 MPa polyethylene glycol caused leaf growth to stop almost immedately, but growth resumed at a much lower rate after 0.5–1 h. In the growing region of leaves, the polyribosome: total ribosome ratio of free (non-membrane-bound) ribosomes was significantly reduced after 15 min stress, but a decrease in the large polyribosome:total polyribosome ratio occurred only after 1–2 h. Membrane-bound and free polyribosome levels both decreased to 70% of unstressed control values after 4 h stress. Recovery of total polyribosomes occurred within 1 h after relief of 4 h stress, but required 3 h after relief of 24 h stress. Stress detectably reduced the water potential and osmotic potential of growing tissue within 0.5–1.0 h, and osmotic adjustment continued for up to 10 h. Recovery of water status was incomplete after 1 h relief of a 4 h stress. In contrast, expanded blade tissues of stressed plants underwent minor changes in water status and slow decreases in polyribosomes levels. These results confirm that growing tissues of barley leaves are selectively responsive to stress, and suggest that changes in growth, water status and polyribosome levels may be initiated by the same signal. Measurements of seedling growth, polyribosome levels and water status of growing tissues of barley and wheat (Triticum aestivum L. cv. Zaragoza) leaves, etiolated pea (Pisum sativum L. cv. Alaska) epicotyl and etiolated squash (Cucurbita pepo L. cv. Elite) hypocotyl stressed with polyethylene glycol solutions of −0.3 to −0.8 MPa for 12 h or more showed that polyribosome levels were highly correlated with seedling growth rate as well as with tissue water and osmotic potentials, while turgor remained unchanged. These results suggest that long-term growth of osmotically stressed plants may be limited by a reduced capacity for protein synthesis in growing tissues and is not dictated by turgor loss.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1985.tb01218.x
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