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  • 11
    Electronic Resource
    Electronic Resource
    Structural changes during Ar-ion irradiation of laser-deposited Fe/Ag multilayers (1995)
    Springer
    Applied physics 61 (1995), S. 591-594 
    Details
    ISSN: 1432-0630
    Keywords: 61.80.-x ; 68.35.Rh ; 81.40.-z
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract During 350 keV Ar+ irradiation at 77K, laser-deposited Fe−Ag multilayers first show stress relaxation and demixing processes at the interfaces followed by grain coarsening and a supersaturation of the bcc α-Fe phase with Ag due to ballistic mixing. At high fluence, the fcc γ-Fe(Ag) phase (a=3.65 Å) is formed, which can be explained by either chemically guided ballistic short-range relocations or by the occurrence of thermal spikes, where all atoms possess sufficient energy to allow collective structural rearrangements, but only during such a short time that a decomposition due to long-range diffusion is suppressed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01542869
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    Paper (German National Licenses)
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  • 12
    Electronic Resource
    Electronic Resource
    Radar mapping of Mercury's polar anomalies (1994)
    [s.l.] : Nature Publishing Group
    Nature 369 (1994), S. 213-215 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In a preliminary report of Arecibo radar results2 we showed that the south polar anomaly was mostly confined to the large crater Chao Meng-Fu. At the north pole the evidence was not so tidy. The north polar anomaly was clearly too large to fit within a single crater and had an offset from the pole ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/369213a0
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    Paper (German National Licenses)
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  • 13
    Electronic Resource
    Electronic Resource
    Comparison of rRNA genotype frequencies ofParmelia sulcata from long established and recolonizing sites following sulphur dioxide amelioration (1999)
    Springer
    Plant systematics and evolution 217 (1999), S. 177-183 
    Details
    ISSN: 1615-6110
    Keywords: Lichenized-fungi ; recolonization ; rRNA ; Parmelia sulcata ; SO2 ; genotypes ; conservation ; introns
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The variable internally transcribed spacer (ITS) regions of the rRNA gene cluster, and the termini of the large and small subunit genes, were amplified from 231 specimens of the lichen-forming fungusParmelia sulcata from the UK and Spain. Amplification products comprised three distinct size groups of 580, 622 and 835 base pairs (bp). Analyses of the collections from England, Wales and central Spain established the 622 bp genotype as the most widespread, and the 835 bp genotype as the next most frequent. The size difference was due to a group I intron at the 3′ end of the small subunit. The relative frequencies of the three genotypes were consistent between long established sites in Spain and the UK. The frequencies of the different size classes were examined in the vegetatively reproducing populations recolonizing following the amelioration of sulphur dioxide air pollution. Populations ofP. sulcata from long established sites where sulphur dioxide levels are known to have risen and then fallen contained two genotypes. Populations from recolonising sites whereP. sulcata had previously been lost consisted of a single genotype (622bp). This technology provides a powerful tool for testing hypotheses relating to the individuality and population structure of lichens, and has implications for lichen conservation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00984363
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  • 14
    Electronic Resource
    Electronic Resource
    Nir spectroscopy and molecular shocks in Herbig-Haro 1 (1995)
    Springer
    Astrophysics and space science 233 (1995), S. 63-66 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Near Infrared spectroscopic observations (1.2–2.4µm) of two condensations (HH 1A & HH 1G) of Herbig-Haro object 1 are used to explore the nature of its molecular shocks and extinction. The H2 emission lines display a more complex behaviour than that accounted for C or J type shock models. The extinction, determined from the ratio of [Fe II] 1.257 & 1.644µm, is higher than what is expected from optical [S II] measurements, and it may indicate real discrepancies between the optical and IR regions of the ISM extinction curve.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00627333
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  • 15
    Electronic Resource
    Electronic Resource
    Use of scanning cytometry in studying bradykinin binding in MRC-5 cells (1994)
    Springer
    Cell biology and toxicology 10 (1994), S. 317-322 
    Details
    ISSN: 1573-6822
    Keywords: bradykinin ; calcium ; ionomycin ; scanning cytometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Ligand-receptor affinity is classically demonstrated by measuring ligand binding density to a specific site on membrane preparations, and receptor function is studied by measuring calcium flux, cell by cell, using microspectrofluorimetry. In order to study these phenomena in a larger cell population, calcium flux was measured in MRC-5 cell line expressing the B2 receptor for bradykinin using an ACAS 570 scanning cytometer. Following incorporation of fluo3/AM, different ligands were studied, singly or in association with bradykinin. This study confirmed that only the B2 receptor is present on the plasma membrane of MRC-5 cells. Bradykinin binding to the B2 receptor was not modified by a B1 agonist (Des-Arg9-bradykinin) or by a B1 antagonist (Des-Arg9-[Leu8]-bradykinin) but was inhibited by a B2 agonist ([Hyp3]-bradykinin) and a B2 antagonist (HOE 140). The source of free calcium was also studied in comparison with ionomycin. The intensity of the calcium peak after binding of bradykinin is independent of the concentration of extracellular calcium. Preincubation with diltiazem or TMB-8 did not modify calcium flux indicating that transduction of the signal after bradykinin binding in this cell line is independent of voltage-dependent channels and does not require mobilization of intracellular calcium blocked by TMB-8. In conclusion, scanning cytometry can be used to study ligand-receptor binding and to obtain results rapidly from multiple cells. Recording of individual cell variations and kinetics enables identification of active agonists or antagonists and consequently the selection of new compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00755777
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