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  • 1
    Electronic Resource
    Electronic Resource
    A Theoretical Model for Kaiser Effect in Rock (1997)
    Springer
    Pure and applied geophysics 150 (1997), S. 203-215 
    Details
    ISSN: 1420-9136
    Keywords: Key words: Kaiser effect, acoustic emission, rock failure, damage, seismicity, non-linearity.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract. —The mechanism of Kaiser effect was studied with the aid of a damage model for rock. Recognizing that the AE counts are transient elastic waves due to local damage of the rock, the quantitative relation between AE counts and statistical distribution of the local strength of the rock has been established. Subsequently, according to Damage Theory, an expression for Kaiser Effect under uniaxial stress state was derived from the model. This is found to be in good agreement with the experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000240050073
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  • 2
    Electronic Resource
    Electronic Resource
    Glucosaminylmuramyl dipeptide (GMDP) modulates endothelial cell activities in vitro but has no effect on angiogenesis in vivo (1997)
    Springer
    Inflammation research 46 (1997), S. 348-353 
    Details
    ISSN: 1420-908X
    Keywords: Key words: Glucosaminylmuramyl dipeptide — Human umbilical vein endothelial cells — ICAM-1 — CD31 — Cell adhesion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Objective and Design: The aim of the study was to evaluate the effects of GMDP on angiogenesis in vivo and as a modulator of human umbilical vein endothelial cell proliferation, cell surface antigen expression and cell adhesion in vitro.¶Materials: Human umbilical vein endothelial cells (HUVEC), fertilized white leghorn chicken eggs, antibodies against adhesion molecules and glucosaminylmuramyl dipeptide (GMDP).¶Treatment: GMDP [0.01–100 μg/ml] applied to cell cultures for 6–72 h and to the chick chorioallantoic membrane (CAM) for four days.¶Methods: Angiogenic activity of GMDP in vivo was assessed using the CAM assay; HUVEC proliferation was measured by tritiated thymidine incorporation and cell cycle studies; cell surface antigen expression by indirect immunofluorescence and flow cytometry; cell adhesion by quantification of [3H]-thymidine labeled leukocyte adherence to HUVEC monolayers. Statistical analysis was performed using one-way ANOVA and if necessary was followed by Duncan's multiple range test for variables.¶Results: GMDP induced [3H]-thymidine incorporation in a concentration- and time-dependent manner (p 〈 0.003) and significantly increased the proportion of cells in the S phase of the cell cycle (p 〈 0.03). It weakly augmented the expression of ICAM-1 and CD31 but not adhesion of leukocytes to HUVEC monolayers GMDP was not angiogenic in the CAM assay.¶Conclusions: GMDP can modulate endothelial cell activity without the induction of angiogenesis in vivo which may have implications for its use as a therapeutic agent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000110050200
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  • 3
    Electronic Resource
    Electronic Resource
    ClC-2 Activation Modulates Regulatory Volume Decrease (1999)
    Springer
    The journal of membrane biology 167 (1999), S. 215-221 
    Details
    ISSN: 1432-1424
    Keywords: Key words: ClC-2 — Chloride channels — Patch-clamp electrophysiology — Baculovirus expression — Anti-ClC-2 antibody — Regulatory volume decrease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract. ClC-2 belongs to a large family of chloride channels and its expression in certain cell types is associated with the appearance of swelling-activated chloride (Cl−) currents. In the present report, we examined the hypothesis that ClC-2 plays a role in regulatory volume decrease by expressing ClC-2 in Sf9 cells using the baculovirus system. First, we showed that ClC-2 protein expression is associated with appearance of a Cl− conductance which is activated by hypo-osmotic shock and can be distinguished from swelling-activated chloride currents endogenous to Sf9 cells on the basis of its pharmacology and specific inhibition by an anti-ClC-2 antibody. Second, we show that the rate of regulatory volume decrease is significantly enhanced in Sf9 cells expressing ClC-2 protein. Hence, our data support the hypothesis that ClC-2 is capable of mediating regulatory volume decrease.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002329900485
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  • 4
    Electronic Resource
    Electronic Resource
    Crystallization and preliminary X-ray studies of azurin-I and azurin-II from denitrifying bacterium Alcaligenes xylosoxidans GIFU 1051 (1997)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 53 (1997), S. 337-338 
    Details
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Two distinct azurins named azurin-I and azurin-II were isolated from Alcaligenes xylosoxidans GIFU 1051 (AzG-I and AzG-II). They have been purified and crystallized. The crystals of AzG-I belong to the monoclinic crystal system, space group C2, unit-cell parameters a = 130.6, b = 54.4, c = 74.7 Å, β = 96.1°. The crystals of AzG-II belong to the tetragonal crystal system, space group P4122 or P4322, unit-cell parameters a = b = 52.6, c = 100.7 Å. Both crystals diffract up to 2.0 Å resolution and are suitable for X-ray crystallographic studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0907444996014758
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  • 5
    Electronic Resource
    Electronic Resource
    Crystallization and preliminary X-ray studies of plastocyanin from Silene expressed in E. coli (1997)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 53 (1997), S. 129-130 
    Details
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Plastocyanin from Silene (SilPc) expressed in E. coli has been crystallized in a form suitable for X-ray diffraction analysis by a macroseeding method using ammonium sulfate as a precipitant in acetate buffer (pH = 5.5). These crystals belong to the trigonal space group P3121 or P3221 with lattice parameters a = b = 76.6, c = 65.5 Å, indicating an asymmetric unit containing two plastocyanin molecules. The crystals diffracted to at least 2.0 Å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0907444996010724
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  • 6
    Electronic Resource
    Electronic Resource
    Linking insulator-to-metal transitions at zero and finite magnetic fields (1999)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 400 (1999), S. 735-737 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] For many years, it was widely accepted that electrons confined to two dimensions would adopt an insulating ground state at zero temperature and in zero magnetic field. Application of a strong perpendicular magnetic field changes this picture, resulting, in a transition from the insulating phase ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/23419
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  • 7
    Electronic Resource
    Electronic Resource
    Dilemma over genetics and population in China (1998)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 394 (1998), S. 313-314 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SirAs you write in a recent editorial, the forthcoming 18th International Congress on Genetics in Beijing will provide a rare opportunity to continue discourse on the ethics and science of eugenics. But a number of fundamental problems facing geneticists in China deserve ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/28481
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  • 8
    Electronic Resource
    Electronic Resource
    Gain bandwidth and noise characteristics of millimeter-wave YBa2Cu3O7 hot-electron bolometer mixers (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 1727-1729 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Conversion gain bandwidth and noise characteristics are reported for lattice-cooled superconducting YBa2Cu3O7 hot-electron bolometers acting as low-power, wide-bandwidth heterodyne mixers at 75 and 585 GHz. Near 77 K, these mixers show intrinsic conversion gain as high as −16 dB using ∼1 μW of local oscillator power. The measured gain bandwidth is well described by a single Lorentzian with −3 dB frequency of 5–9 GHz. Measurements of output noise combined with conversion gain indicate an optimal input noise temperature of ∼5000 K, significantly lower than calculations predict. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122268
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  • 9
    Electronic Resource
    Electronic Resource
    Quantum transport in metallic nanowires fabricated by electrochemical deposition/dissolution (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 894-896 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A nonmechanical method for fabricating a metallic narrow constriction between two electrodes using electrochemical deposition is described. The width of the constriction can be adjusted by slowly dissolving metal atoms away or redepositing atoms onto the constriction which can be controlled flexibly by the electrodes' potentials. Well-defined plateaus near the integer numbers of the conductance quantum have been observed in these constrictions at room temperature. Since no mechanical movements are involved, this method has the potential of fabricating nanoconstrictions with long term stability. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120928
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of TiC additions to the microstructure and magnetic properties of Nd9.5Fe84.5B6 melt-spun ribbons : The 7th joint MMM-intermag conference on magnetism and magnetic materials (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 6631-6633 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Rapidly solidified samples of Nd9.5Fe84.5B6 with and without 3 at. % TiC were prepared by melt spinning and melt extraction and then annealed in vacuum (3×10−6 Torr) at temperatures from 600 to 750 °C. For alloys melt spun under similar conditions, the overquenched state was achieved at wheel speeds 〉10 m/s for the TiC added alloy while 〉20 m/s was necessary without TiC. The overquenched samples contained a smaller fraction of α-Fe in smaller grains than the undercooled samples where Fe dendrites formed near the free surface during solidification. These Fe dendrites were not removed by annealing. In addition, large orientated 2-14-1 grains nucleated on the Fe dendrites. This combination is detrimental to the magnetic properties. The addition of TiC results in improved control of the microstructure over a larger fraction of the ribbon volume enhancing the magnetic properties. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367929
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