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  • 1985-1989  (7)
  • 1935-1939
  • 1930-1934
  • 1989  (7)
  • 1
    Electronic Resource
    Electronic Resource
    Trispiro[2.1.2.1.2.1]dodecane-4,8,12-trione and other oligomers of carbonylcyclopropane. The organozinc route (1989)
    s.l. : American Chemical Society
    The @journal of organic chemistry 54 (1989), S. 6096-6100 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00287a022
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Correlations in micellar solutions under shear: a small-angle neutron scattering study of the chain surfactant N-hexadecyloctyldimethylammonium bromide (1989)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 93 (1989), S. 4267-4276 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100347a071
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Cloudphysical parameters in dependence on height above cloud base in different clouds (1989)
    Springer
    Meteorology and atmospheric physics 41 (1989), S. 247-254 
    Details
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Summary On flights with the DLR icing research aircraft the dependence of aircraft icing on cloudphysical parameters was determined; both for aircraft-referred icing and for normalized icing, as well as for various clouds and locations in clouds. This is done with an improvement of icing predicitons in mind. The species of the cloud and the distance from cloud base are called here “cloud parameters”; while under “cloudphysical parameters” are understood liquid water content, temperature, particle size distribution and particle phase. Results from four icing flights are discussed, selected from a total of forty vertical soundings. —The results are arranged in four classes: Stratus/cumulus mixed, stratus; with and without precipitation at the ground. 1. Stratus/cumulus with either simultaneous or earlier (3 h) precipitation at ground: Maxima of liquid water content (LWC: 0.75 and 0.55 g/m3, resp.) and maxima of the median volume diameter (MVD: 183 and 123 μm, resp.) both located in lower half of clouds. 2. Stratus/cumulus without precipitation: Maximum ofLWC (0.45 g/m3) in upper third of cloud, butMVD increasing from base to top of cloud (7 to 20 μm). 3. Stratus with precipitation: No results. 4. Stratus without precipitation: BothLWC andMVD increase from base to top of cloud; maxima directly beneath cloud top:LWC 0.50 g/m3;MVD 17 μm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01026113
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Regulation of plant genes specifically induced in nitrogen-fixing nodules: role of cis-acting elements and trans-acting factors in leghemoglobin gene expression (1989)
    Springer
    Plant molecular biology 13 (1989), S. 319-325 
    Details
    ISSN: 1573-5028
    Keywords: nodulins ; leghmoglobin ; gene regulation ; cis-acting elements ; trans-acting factors ; transgenic plants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Transgenic alfalfa plants harboring a gene fusion between the soybean leghemoglobin (lbc3) promoter region and the chloramphenicol acetyl transferase (cat) gene were used to determine the influence of rhizobial mutants on lb gene expression in nodules. The promoter region of the Sesbania rostrata glb3 (Srglb3) leghemoglobin gene was examined for the presence of conserved motifs homologous to binding site 1 and 2 of the soybean lbc3 promoter region, found to interact with a trans-acting factor present in soybean nodule nuclear extracts (Jensen EO, Marcker KA, Schell J, de Bruijn FJ, EMBO J 7: 1265–1271, 1988). Subfragments of the S. rostrata glb3 (Srglb3) promoter region were examined for binding to trans-acting factors from nodule nuclear extracts. In addition to the binding sites previously identified (Metz BA, Welters P, Hoffmann HJ, Jensen EO, Schell J, de Bruijn FJ, Mol Gen Genet 214: 181–191), several other sites were found to interact with trans-acting factors. In most cases the same trans-acting factor(s) were shown to be involved. One fragment (202) was found to bind specifically to a different factor (protein) which was extremely heat-resistant (100°C). The appearance of this factor was shown to be developmentally regulated since the expected protein-DNA complexes were first observed around 12 days after infection, concomitant with the production of leghemoglobin proteins. Fragments of the Srglb3 5′ upstream region were fused to the β-glucuronidase reporter gene with its own CAAT and TATA box region or those of the cauliflower mosaic virus 35S and nopaline synthase (nos) promoters. These constructs were used to generate transgenic Lotus corniculatus plants and their expression was measured in different plant tissues. The Srglb3 CAAT and TATA box region was found to be required for nodule-specific expression and several upstream enhancer-type regions were identified.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025320
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  • 5
    Electronic Resource
    Electronic Resource
    Small-angle neutron scattering on shear-induced micellar structures (1989)
    Springer
    Colloid & polymer science 267 (1989), S. 818-824 
    Details
    ISSN: 1435-1536
    Keywords: Sall-angleneutronscattering (SANS) ; shear-inducedphasetransition ; orientedmicelles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Small-angle neutron scattering (SANS) experiments on sheared aqueous surfactant solutions of tetradecyltrimethylammoniumsalicylate (TTMA-Sal) are reported. A5-mM-solution without shear shows a weak correlation peak at a momentum transfer of 0.09 nm−1 which has its origin in the micellar interaction. For shear rates above a threshold value of Γ=40 s−1 the scattering pattern shows an irregular increase in anisotropy. The analysis of the anisotropic pattern reveals the existence of two types of micelles: Small rodlike micelles which are weakly aligned and very large rodlike aggregates which are strongly aligned and which are present above the threshold value ofΓ. The two micelles are in equilibrium with each other and the equilibrium shifts with increasing shear rate to the side of the large oriented micelles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410121
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Thickness dependence of the work function in double-layer metallic films (1989)
    Springer
    The European physical journal 77 (1989), S. 399-407 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The work function of metallic thin films limited by symmetric surfaces is expected to be thickness dependent at a level of 0.1 eV and a thickness range of about 5 nm. Recent experiments, however, demonstrated that Cu films on glass or Ni substrates show a long ranging (10–20 nm) increase of the work function with increasing film thickness [1]. This effect was attributed to a violation of local charge neutrality in films with unlike surfaces. In this paper we show that the barrier height of thin film diodes like metal-insulator-metal (MIM)-, metal-semiconductor (Schottky contacts)-and metal-vacuum-metal (Kelvin capacitors) structures decreases with increasing thickness of one metal electrode. This metal electrode consists of a double layer whose single layer thicknesses are of the order of few tens of nm. The observed effect can be attributed to a decrease of the work function at the counter limiting interface not exposed to the evaporation beam. A possible explanation can be found again in the violation of the local charge neutrality in films with unlike surfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01453789
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Struktur-Wirkungs-Prinzipien von Korrosionsinhibitoren für die Rohöl- und ErdgasförderungHerrn Prof. Dr. W. Hilger zum 60. Geburtstag gewidmet (1989)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 40 (1989), S. 629-634 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Structure efficiency relationships of corrosion inhibitors for oil and gas productionStructure efficiency relationships for quarternary ammonium compounds as corrosion inhibitors for oil and gas production were investigated in the system mild steel/aqueous NaCl solution (5 weight%, CO2 saturated) at T = 298 K and T = 343 K by Electrochemical Impedance Spectroscopy (EIS) and weight loss measurements. In-situ EIS measurements rapidly gave relatively accurate results on differential inhibitor efficiencies. Composition, thickness and inhibitor content of the inhomogeneous 3-D protecting layers formed on highly pure iron surfaces were determined by XPS measurements. The inhibition mechanism of the inhibitor used could be determined by its distribution within the 3-D protecting surface layer and is interpreted in terms of the interphase inhibition concept.
    Notes: Struktur-Wirkungs-Prinzipien von quartären Ammoniumverbindungen als Korrosionsinhibitoren für die Rohöl- und Erdgasförderung wurden anhand von Elektrochemischer Impedanz Spektroskopie (EIS) und Gewichtsverlustmessungen in Systemen C-Stahl/wäßrige NaCl-Lösung (5 Gew.%, CO2-gesättigt) bei T = 298 K und T = 343 K untersucht. Es konnte gezeigt werden, daß in-situ EIS Messungen rasch relativ genaue Resultate über differentielle Inhibitorwirksamkeiten liefern. Aus XPS Untersuchungen an Oberflächen aus Reinsteisen ließen sich Zusammensetzung, Dicke und Inhibitorgehalt der sich auf dem Substrat bildenden inhomogenen 3-D Deckschichten bestimmen. Der Wirkungsmechanismus des verwendeten Inhibitors konnte aus seiner Verteilung innerhalb der 3-D Deckschicht mit dem Konzept der Interphaseninhibition gedeutet werden.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19890401102
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