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  • 1
    Electronic Resource
    Electronic Resource
    Potential and limitations of nucleon transfer experiments with radioactive beams at REX-ISOLDE (2001)
    Springer
    The European physical journal 10 (2001), S. 85-95 
    Details
    ISSN: 1434-601X
    Keywords: PACS. 29.40.Cs Gas-filled counters: ionization chambers, proportional, and avalanche counters – 29.30.Kv X- and γ-ray spectroscopy – 25.60.Je Transfer reactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: As a tool for studying the structure of nuclei far off stability the technique of γ-ray spectroscopy after low-energy single-nucleon transfer reactions with radioactive nuclear beams in inverse kinematics was investigated. Modules of the MINIBALL germanium array and a thin position-sensitive parallel plate avalanche counter (PPAC) to be employed in future experiments at REX-ISOLDE were used in a test experiment performed with a stable 36S beam on deuteron and 9Be targets. It is demonstrated that the Doppler broadening of γ lines detected by the MINIBALL modules is considerably reduced by exploiting their segmentation, and that for beam intensities up to 106 particles/s the PPAC positioned around zero degrees with respect to the beam axis allows not only to significantly reduce the γ background by requiring coincidences with the transfer products but also to control the beam and its intensity by single particle counting. The predicted large neutron pickup cross-sections of neutron-rich light nuclei on 2H and 9Be targets at REX-ISOLDE energies of 2.2 MeV . A are confirmed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500170147
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  • 2
    Electronic Resource
    Electronic Resource
    Enantioselective capillary gas chromatography —olfactometry in essential oil analysis (1993)
    Springer
    Naturwissenschaften 80 (1993), S. 470-472 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01136040
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  • 3
    Electronic Resource
    Electronic Resource
    Magma Mixing in Bolivian Tin Porphyries (1999)
    Springer
    Naturwissenschaften 86 (1999), S. 40-43 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001140050567
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  • 4
    Electronic Resource
    Electronic Resource
    Radioluminescence Dating: A New Tool for Quaternary Geology and Archaeology (1999)
    Springer
    Naturwissenschaften 86 (1999), S. 441-444 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Notes: Abstract  Natural minerals, such as widespread quartz and feldspars, have physical properties which enable them to be used as radiation dosimeters. The underlying luminescence phenomena have made it possible in recent decades to determine the age of a variety of materials important for quaternary geochronometry and archaeochronometry. We present a new luminescence dating method based on radioluminescence measurements of potassium feldspar. For the first time we have been able to investigate the light-emitting transition of electrons from the conduction band to an optically sensitive electron trap. Many advantages can be derived from such direct measurements of the metastable electron density in this particular trap, which produces the age-dependent signal. The method can be used to date the last light exposure of feldspar grains within a range of a few hundred to more than 200,000 years. Examples are presented of age determination of various waterlaid quaternary sands. The results of a basic study of feldspar radioluminescence also shed light on effects not sufficiently understood in conventional dating by luminescence techniques, especially in infrared optically stimulated luminescence dating of feldspar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001140050649
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  • 5
    Electronic Resource
    Electronic Resource
    From rocks to ore (2000)
    Springer
    International journal of earth sciences 89 (2000), S. 284-294 
    Details
    ISSN: 1437-3262
    Keywords: Key words Metallogeny ; Ore deposits ; Porphyry systems ; Central Andes ; Melt inclusions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Metal enrichment to ore grade is the ultimate outgrowth of large-scale and long-term fractionation processes of the thermally driven and unique water-cooled geological evolution of the Earth. Silicic magmatism along convergent margins is the most important lithospheric fractionation process for the formation of the continental crust and porphyry/intrusion-related ore deposits. Reconnaissance microanalysis of melt inclusions from Central Andean porphyry systems refines a metallogenic model for copper–gold and tin porphyry mineralization. Magmatic mixing and early exsolution of a fluid phase are important ingredients for porphyry Cu–Au systems in association with silicic rocks of moderate levels of fractionation (such as diorites and monzonites), whereas extended magmatic fractionation with late-stage fluid evolution characterize lithophile-element-enriched tin porphyry systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005310000085
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  • 6
    Electronic Resource
    Electronic Resource
    Domain shapes and monolayer structures of triple-chain phospholipids on water (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 1537-1544 
    Details
    ISSN: 0392-6737
    Keywords: Thin films, growth, structure, epitaxy, and nonelectronic properties ; Structure and morphology, thickness ; Structure, bonding, stereochemistry, and isomerism of biomolecules ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Two triple-chain phospholipid isomers were investigated at the air-water interface by means of fluorescence microscopy and grazing incidence X-ray diffraction (GID). The two lipids differ only in the position of the branched chain at the glycerol backbone. Fluorescence microscopy shows different domain sharp-edged domains. In the case of dendritic domains the chains are more tilted, the deviation from hexagonal symmetry is more pronounced and hence the lattice anisotropy is larger.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02462039
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  • 7
    Electronic Resource
    Electronic Resource
    HF sputtered indium oxide films doped with tin (1978)
    Springer
    Applied physics 16 (1978), S. 381-390 
    Details
    ISSN: 1432-0630
    Keywords: 73 ; 72.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Indium-tin-oxide films (ITO films) sputtered in Ar-atmosphere with and without addition of oxygen reveal an irreversible increase in conductivity during annealing in vacuum. This annealing process increases drastically the density of free electrons, while the Hall mobility changes only slightly. Below the annealing temperature the temperature dependence of the conductivity is reversible. In films with low density of free electrons, which behave like non-degenerated semiconductors, two activation energies for the mobility could be found. The irreversible changes, observed during annealing in the vacuum, are explained by diffusion of oxygen from the interior of the film to the surface, followed by desorption of the oxygen from the surface into the vacuum. The excess oxygen in the non-stoichiometric films plays the role of electron traps. The irreversible effects during annealing in the vacuum are partly reversible in the long run. If the annealed films are exposed to oxygen or air their conductivity decreases because of diffusion of oxygen from the surface into the film.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00885863
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  • 8
    Electronic Resource
    Electronic Resource
    A change in the phosphorylation pattern of the 30000–33000 M r synaptonemal complex proteins of the rat between early and mid-pachytene (1995)
    Springer
    Chromosoma 104 (1995), S. 154-163 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. The lateral elements (LEs) of synaptonemal complexes (SCs) of the rat contain major components with relative electrophoretic mobilities (M r s) of 30000–33000, which are the products of a single gene. After one-dimensional separation of SC proteins on polyacrylamide-SDS gels, these components show up as two major bands, whereas upon two-dimensional electrophoresis they are resolved in at least 24 spots, which focus at pH 6.5 to 9.5. In this paper we show that these spots represent phosphorylation variants. For the analysis of the phosphorylation of the 30000- to 33000-M r SC components during progression through meiotic prophase, we developed a procedure for isolation of fractions of testicular cells of the rat that are enriched in separate stages of meiotic prophase. Analysis of the 30000- to 33000-M r SC components in these fractions by two-dimensional electrophoresis and immunoblotting showed that phosphorylated variants of the 30000- to 33000-M r SC proteins occur throughout meiotic prophase. However, the extent of phosphorylation changes between early and mid-pachytene, when one phosphate group is probably added to each of the variants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00352179
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  • 9
    Electronic Resource
    Electronic Resource
    Localization of SCP2 and SCP3 protein molecules within synaptonemal complexes of the rat (1998)
    Springer
    Chromosoma 107 (1998), S. 540-548 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract.  SCP2 and SCP3 are major protein components of the lateral elements (LEs) of synaptonemal complexes (SCs) of the rat, with M rs of 173,000 and 30,000. We performed a detailed immunocytochemical comparison of the localization of SCP2 and SCP3 within SCs at the electron microscopic level. The ultrastructural localization of SCP2 and SCP3 was analyzed by immunogold labeling of two types of preparations, namely surface-spread spermatocytes and ultrathin sections of Lowicryl-embedded testicular tissue of the rat. For each of the antisera used, the distribution of immunogold label over SCs in surface-spread spermatocytes differed significantly from the distribution of label on sections. We attributed this difference to artifacts caused by the surface-spreading technique, and therefore we relied on sections for the precise localization of epitopes. On sections, the distribution of label obtained with two antisera against nonoverlapping, widely separated fragments of SCP2 did not differ significantly. There was a small but significant difference between the labeling pattern obtained with an anti-SCP3 serum and the pattern obtained with either of the two antisera against fragments of SCP2; although for all three antisera the peak of the immunogold label coincided with the center of the LE, the distributions of label obtained with the antisera against fragments of SCP2 were asymmetrical, with a shoulder at the inner side of the LE, whereas the distribution of label obtained with anti-SCP3 serum was symmetrical. Furthermore, we observed fuzzy connections between the LEs that were labeled by anti-SCP2 but not anti-SCP3 antibodies. It is possible that labeling of these fuzzy bridges caused the shoulder in the gold label distributions obtained with anti-SCP2 antibodies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004120050340
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  • 10
    Electronic Resource
    Electronic Resource
    Automated matrix separation and preconcentration for the trace level determination of metal impurities in ultrapure inorganic salts by high-resolution ICP-MS (1999)
    Springer
    Fresenius' journal of analytical chemistry 364 (1999), S. 694-699 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A rapid and simple analytical method for the determination of transition metals and rare earth elements at sub-ng/g levels in alkaline and earth alkaline salt matrices was developed. Automated solid-phase extraction was utilized for matrix separation and analyte preconcentration from highly concentrated brine solutions. The HPLC system used was equipped with a chelation column packed with an iminodiacetate-based resin. Detection was accomplished by means of high-resolution inductively-coupled plasma mass spectrometry (ICP-MS), which allowed quasi-simultaneous multi-element determinations. A microconcentric nebulizer was employed for HR-ICP-MS to determine the elements of interest in small volumes of sample extracts. The method was shown to be very sensitive with limits of quantification in the range of 1–40 ng/g for all investigated elements. The method exhibited excellent precisions, high analyte recoveries, linear responses of least three orders of magnitude, high accuracy and low contamination susceptibility. A comparison of automated solid-phase extraction with methodologies utilizing traditional liquid-liquid extraction showed that the former offered similar analytical performance but was clearly easier to use and faster to perform, resulting in substantial time, labor and cost savings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160051416
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