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  • 1990-1994  (7)
  • 1985-1989  (1)
  • 1975-1979  (3)
  • 1965-1969  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Positron mobility in thermally grown SiO2 measured by Doppler broadening technique (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 2874-2876 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The positron mobility in thermally grown SiO2 is deduced from Doppler broadening lineshape data on a metal-oxide-semiconductor sample for positrons implanted into the oxide layer. The fitted mobility is ∼13(10)×10−3 cm2/s V. This value is between that of the electron and hole mobilities in the same system and is two orders of magnitude smaller than the previous estimate from positron measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349353
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  • 2
    Electronic Resource
    Electronic Resource
    Efficient magnetic focusing of low-energy ions (1–5 eV) onto solids for use in surface chemistry studies (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 175-178 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A method is described that allows the efficient collection and focusing of ions, with kinetic energies between 1 and 5 eV, onto a nonmagnetic metal surface. Magnetic fields near the sample are used to focus the low-energy ions and typical currents achieved thus far exceed 100 nA/cm2 for 1-eV ion energies. The magnetic field of a magnet placed behind the sample significantly reduces the problem of transverse displacement of the ions due to beam divergence and space-charge effects. The magnetic field confines the particle to a circular orbit along the axial direction (cyclotron motion), while leaving the kinetic energy of the ion unaffected. We have utilized this method to interact Ar+ and CH+3 with 1-eV translational energy and 100 nA of current on a Pt surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142952
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Centroid shift of γ rays from positron annihilation in the depletion region of metal-oxide-semiconductor structures (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 86-88 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using metal-oxide-semiconductor (MOS) structures, the shift of centroid (peak) of γ-ray energy distributions emitted from positron annihilation has been measured as a function of incident positron energy. The Doppler centroid shift was found to be consistent with the positron motion in the MOS depletion region. The results are described by a one-dimensional positron diffusion model, and provide information on "effective'' positron diffusion length under applied field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104399
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    IMMUNOGENETIC ASPECTS OF HUMAN THYROGLOBULIN-REACTIVE T CELL LINES AND HYBRIDOMAS (1990)
    Oxford, UK : Blackwell Publishing Ltd
    International journal of immunogenetics 17 (1990), S. 0 
    Details
    ISSN: 1744-313X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: The in vitro proliferative response of T cells primed with human thyroglobulin (Tg) was compared in 11 independent haplotypes on B10 background. B10.K and B10.S mice were the most responsive, whereas, with the exception of B10.PL (H-2u, all other B10 congenics were intermediate responders. The two best responders to in vitro challenge with human Tg, of the k and s haplotype, are the same as those showing H-2-linked susceptibility to induction of experimental autoimmune thyroiditis (EAT) with mouse Tg. Since shared epitopes on human and mouse Tgs have been shown to be thyroiditogenic by adoptive transfer studies in CBA (H-2k) mice, the findings indicate that shared epitopes may be studied in appropriate (i.e. EAT-susceptible) strains of mice. Therefore, we proceeded to develop methods to produce T-cell lines and hybridomas to human Tg in B10.K and B10.S mice, test their cross-reactivity to heterologous Tgs and their Ia restriction patterns. By using antigen-presenting cells from recombinant strains, we identified restriction elements encoded by the I-A subregion alone and a combinatorial molecule from the I-AI/I-E subregions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1744-313X.1990.tb00887.x
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Studies on Interference with Tolerance Induction in T Cells (1977)
    Oxford, UK : Blackwell Publishing Ltd
    Scandinavian journal of immunology 6 (1977), S. 0 
    Details
    ISSN: 1365-3083
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The mechanism of T-cell tolerance to a thymus-dependent antigen was examined, using the adjuvant polyadenylic-polyuridylic acid (poly A:U). In adoptive transfer experiments, thymus cells obtained from donor mice 2 days after treatment with a tolerogenic dose of bovine γ-globulin (sBGG) did not cooperate with bone marrow (BM) cells in irradiated recipients challenged with aggregated BGG (aBGG). In contrast, thymus cells from donors given sBGG plus poly A:U retained their helper activity, as assayed by hemagglutination and rosette formation of spleen cells. The effect of poly A:U in preventing tolerance induction was also demonstrable in the cortisone-resistant population, in that thymus cells from cortisone-treated donors that had received sBGG and poly A:U retained their helper function. The presence of suppressor cells and the effect of poly A:U on their stimulation were also examined. sBGG-treated thymus cells suppressed the response of BGG-primed spleen cells in lethally irradiated mice, whereas thymus cells from donors treated with sBGG and poly A:U were not suppressive. These observations show that poly A:U prevents tolerance induction and the development of suppressor activity in T cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3083.1977.tb00359.x
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Incorporation of Exogenous (Phage) DNA into Amphibian Oocytes (1967)
    [s.l.] : Nature Publishing Group
    Nature 214 (1967), S. 491-491 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In order to investigate this possibility, we have treated Triton oocytes with 14C-DNA (phage) in vivo and followed its incorporation by autoradiography. Phage DNA, randomly labelled with carbon-14, was given by Schwarz. The radioactive DNA had a specific activity of 1.34 µc./ mg and appeared ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/214491a0
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Mutants of Schizosaccharomyces pombe defective in glycerol catabolism (1987)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 43 (1987), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Mutants of Schizosaccharomyces pombe unable to grow or growing very slowly on glycerol have been isolated. Some, which could grow on dihydroxyacetone, lacked, or in one mutant possessed reduced amounts of, glycerol dehydrogenase (glycerol:NAD+ 2-oxidoreductase); others could not grow on dihydroxyacetone and lacked dihydroxyacetone kinase. Spontaneous revertants able to grow on glycerol had regained these enzymes. These results provide evidence that glycerol catabolism in S. pombe proceeds via initial dehydrogenation of glycerol followed by phosphorylation of dihydroxyacetone. There is evidence that dihydroxyacetone can be converted to a toxic product.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1987.tb02100.x
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  • 8
    Electronic Resource
    Electronic Resource
    Positron Surface States (1992)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 28-29 (Jan. 1992), p. 275-292 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/25/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.28-29.275.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Positron Emission Phenomena from Solids (1992)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 28-29 (Jan. 1992), p. 195-212 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/25/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.28-29.195.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Leonurine, an improved synthesis (1979)
    Springer
    Cellular and molecular life sciences 35 (1979), S. 571-572 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Leonurine (1) is the uterotonic principle ofLeonurus artemisia. We have developed a simple, high-yield synthetic procedure of1 that is adaptable to large scale preparation. The synthesis involves the condensation of syringic acid and 4-guanidino-1-butanol hydrochloride in the presence of DDC using 1∶1 HMPT-ether as solvent. The synthetic leonurine showed uterotonic activity in vivo and in vitro.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01960323
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