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  • Springer  (81)
  • American Institute of Physics  (56)
  • American Physical Society  (23)
  • Wiley  (22)
  • Nature Publishing Group  (3)
  • American Physical Society (APS)  (2)
  • University of Bremen, Faculty of Geosciences  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Changes in form of elongation factor during development of Artemia salina (1975)
    [s.l.] : Nature Publishing Group
    Nature 258 (1975), S. 452-454 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We purified EF1 from Artemia cysts to near homogeneity using ammonium sulphate precipitation followed by chromatography on DEAE-Sephadex, Sepharose 6B and hydroxylapatite (see legend to Fig. 1). The purified enzyme gave one band on gel electrophoresis at /?H 8.9 and sedi-mented at the same position ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/258452a0
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  • 2
    Electronic Resource
    Electronic Resource
    Primary Structure Heterogeneity in Ribosomal Proteins from Escherichia coli (1967)
    [s.l.] : Nature Publishing Group
    Nature 215 (1967), S. 1293-1295 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1. Chromatography of E. coli ribosomal protein on CM cellulose. The column (43 cm x 3.2 cm) at 14? C was loaded in two portions: 400 mg of ribosomal protein, dissolved in 20 ml. of starting buffer, 0.005 molar ammonium phosphate, 8.0 molar urea, pH 8.0, was applied to the column and the acidic ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2151293a0
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  • 3
    Electronic Resource
    Electronic Resource
    On the Validity of the Evidence for Sub-Units of High Molecular Weight Ribonucleic Acids (1962)
    [s.l.] : Nature Publishing Group
    Nature 194 (1962), S. 444-446 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] ALTHOUGH it is generally agreed that ribosomal /JL ribonucleic acid (UNA) when first isolated consists of two components having sedimentation constants of approximately 16 and 23 S, several investigators have reported that these high-molecular-weight components represent aggregates of low molecular ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/194444a0
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  • 4
    Electronic Resource
    Electronic Resource
    Neue Luminophore mit UV-Emission (1962)
    Springer
    Naturwissenschaften 49 (1962), S. 181-181 
    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/BF00640813
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  • 5
    Electronic Resource
    Electronic Resource
    Zur Biegungstheorie einer Vierpilzplatte mit rechteckigen Stützflächen (1954)
    Springer
    Archive of applied mechanics 22 (1954), S. 163-170 
    Details
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00535869
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  • 6
    Electronic Resource
    Electronic Resource
    Structural investigations of laser-deposited Fe/Al multilayers (1999)
    Springer
    Applied physics 68 (1999), S. 497-503 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 68.55.-a
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Fe/Al multilayers are prepared by crossed-beam pulsed laser deposition and investigated by Rutherford backscattering, conversion electron Mössbauer spectroscopy, and transmission electron microscopy. The results are compared to purely ballistic simulations of the deposition process using the TRIDYN4.0 code. It is found that the intermixing of adjacent layers must be described in terms of ballistic mixing followed by chemical mixing. The phase formation in the transition layer between adjacent layers follows the non-equilibrium behavior of Fe/Al in analogy to investigations on mechanically alloyed and ion-beam-mixed Fe/Al. In Fe-rich areas a bcc solid solution is formed. In Al-rich environment an amorphous phase is observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050932
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  • 7
    Electronic Resource
    Electronic Resource
    Tribological properties of chromium implanted silicon nitride ceramics correlated with microstructure (1997)
    Springer
    Applied physics 65 (1997), S. 281-286 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 81.40; 61.80; 62
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: 3 N4 ceramic after chromium implantation were investigated for the dependence on implantation energy between 200 keV and 3 MeV at a fixed fluence of 1017 ions/cm2. The wear of the modified material is reduced for a load of 2 N independent of ion energy accompanied by a slight increase of the friction coefficient. At higher loads only high-energy implantations result in improved wear behaviour. Structural investigations show the absence of any new phases formed by ion implantation. All energies result in an amorphous layer. For lower energies this amorphous layer reaches up to the surface whereas at higher energies it is covered by still-crystalline but damaged material. The observed wear behaviour can be explained with the amorphization of the near surface region and the stress generated by the volume swelling of the amorphous layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050579
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  • 8
    Electronic Resource
    Electronic Resource
    Preparation of granular Co/Cu by ion-beam mixing of laser-deposited multilayers (2000)
    Springer
    Applied physics 71 (2000), S. 105-107 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 68.55.-a; 61.82.Bg; 81.40.Rs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Co/Cu multilayers were prepared by crossed-beam pulsed laser deposition and characterized by high-angle X-ray diffraction, as well as specular and non-specular reflection. Ion-beam mixing of the multilayers with 150 keV Cu+ ions and a fluence of up to 5×1015 cm-2 leads to the formation of a granular system of superparamagnetic Co clusters in Cu, as shown by magnetic measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050035
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  • 9
    Electronic Resource
    Electronic Resource
    Statistical evidence for remnants of the primordial code in the acceptor stem of prokaryotic transfer RNA (1992)
    Springer
    Journal of molecular evolution 34 (1992), S. 471-477 
    Details
    ISSN: 1432-1432
    Keywords: Transfer RNA ; Acceptor helix stem ; Primordial code ; Statistics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The specificity of interaction of amino acids with triplets in the acceptor helix stem of tRNA was investigated by means of a statistical analysis of 1400 tRNA sequences. The imprint of a prototypic genetic code at position 3–5 of the acceptor helix was detected, but only for those major amino acids, glycine, alanine, aspartic acid, and valine, that are formed by spark discharges of simple gases in the laboratory. Although remnants of the code at position 3–5 are typical for tRNAs of archaebacteria, eubacteria, and chloroplasts, eukaryotes do not seem to contain this code, and mitochondria take up an intermediary position. A duplication mechanism for the transposition of the original 3–5 code toward its present position in the anticodon stern of tRNA is proposed. From this viewpoint, the mode of evolution of mRNA and functional ribosomes becomes more understandable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00160461
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  • 10
    Electronic Resource
    Electronic Resource
    Amorphization of Fe/Al: bulk and thin-film effects (2000)
    Springer
    Applied physics 71 (2000), S. 47-54 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 68.55.-a; 61.82.Bg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. The amorphous non-equilibrium state of the system Fe/Al is studied in bulk and thin-film systems. For bulk samples prepared by ion-beam mixing of laser-deposited multilayers, a bcc solid solution is found for alloys with up to 70 at. % Al. Around 75 at. % Al a Fe2Al5-like crystalline phase is found. An amorphous state with Fe2Al5-like short-range order is found for 80 at. % Al. In thin films, for example the amorphous Al-rich transition layer of a laser-deposited Fe/Al multilayer, the amorphous state can exist for up to 30 at. % Fe due to the high interfacial energy. By ion-beam mixing at low temperatures (about 140 K) an oversaturation with 40 at. % Fe can be achieved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050024
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