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  • 1
    Digitale Medien
    Digitale Medien
    Bioassays on the combined effects of chlorine, heavy metals and temperature on fishes and fish food organisms part I. Effects of chlorine and temperature on juvenile brook trout (Salvelinus fontinalis) (1976)
    Springer
    Bulletin of environmental contamination and toxicology 15 (1976), S. 40-48 
    Details
    ISSN: 1432-0800
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01686194
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  • 2
    Digitale Medien
    Digitale Medien
    Photocontrol of Mimosa pudica L. leaf movement (1967)
    Springer
    Planta 75 (1967), S. 228-238 
    Details
    ISSN: 1432-2048
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary 1. Mimosa pudica L. pinnae close in darkness when phytochrome is predominantly in the far-red-absorbing form (Pfr) and remain open when Pfr is low [6]. The leaflets remain open, however, in normal light periods irrespective of the form of phytochrome. Pinnae, after closing in darkness, regularly reopen in light. 2. An action spectrum for the opening response shows maxima for effectiveness near 710 and 480 nm. This action spectrum is similar to that for a high-energy response affecting morphogenesis in many plants. 3. Dropping of the petiole of M. pudica can be photostimulated by irradiation of the primary pulvinus after holding the plants in darkness [4]. 4. The photostimulation of the primary pulvinus is effective only at wavelengths less than 520 nm. Wave bands in the region of 400 to 470 nm are about equally effective. 5. These photoresponses of M. pudica are related to current discussion about the nature of the high-energy and phytochrome photomorphogenic reactions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00386322
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  • 3
    Digitale Medien
    Digitale Medien
    Water in biological membranes: Adsorption isotherms and circular dichroism as a function of hydration (1972)
    Springer
    The journal of membrane biology 9 (1972), S. 127-140 
    Details
    ISSN: 1432-1424
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Summary Adsorption isotherms of water on human red cell membranes have been measured and the results used to determine the Brunauer-Emmett-Teller monolayer coverage, saturation hydration, and relevant heats and entropies of hydration. The tightly bound monolayer corresponds to a complete covering of only one membrane surface and the saturation hydration is greater than values for globular proteins and phospholipids. A hysteresis loop is observed in the adsorption-desorption cycle. Circular dichroism spectra of membrane films have been measured as a function of hydration in the ultraviolet region of the spectrum. The spectra resemble those of membrane suspensions with reduced scattering. The circular dichroism did not change upon dehydration of the membrane films from 92 to 0% relative humidities, implying a stable membrane protein structure independent of both water content and lipid phase.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01868048
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  • 4
    Digitale Medien
    Digitale Medien
    Simulation studies: a new method of prospective technology assessment and design (1999)
    Springer
    Quality of life research 8 (1999), S. 161-170 
    Details
    ISSN: 1573-2649
    Schlagwort(e): Design proposals ; digital signature ; method simulation studies ; prospective technology assessment ; psychological user problems ; telecooperation.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract In order to examine the social conditions and effects of a broad usage of telecooperation technology in the future, such as the development of design proposals, PROVET (Projektgruppe Verfassungsverträgliche Technikgestaltung) developed the method of simulation studies. The paper describes the problem of prospective technology design for telecooperation, a method to handle it, the simulation studies and the methological background. It demonstrates three simulation studies, in administration of justice, about office dossiers and for a reachability management. It presents results, particularly about the psychological effects of the digital signature as a technical–organizational measure to guarantee obligations between the cooperation partners. The conclusion discusses this research approach in relation to others.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1026442530663
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  • 5
    Digitale Medien
    Digitale Medien
    Temperature dependence of copolymerization parameters in ethene/1-octene copolymerization using homogeneous rac-Me2Si(2-MeBenz[e]Ind)2ZrCl2/MAO catalyst (1997)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 35 (1997), S. 735-740 
    Details
    ISSN: 0887-624X
    Schlagwort(e): homogeneous Ziegler-Natta polymerization ; metallocenes ; ethene/1-octene copolymerization ; copolymerization parameters ; influence of the temperature and solvent ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Ethene was copolymerized with 1-octene using homogeneous MAO-activated rac-Me2Si(2-MeBenz[e]Ind)2ZrCl2 at constant ethene concentration with temperature varying between 0 and 60°C to determine a temperature dependence of copolymerization parameters. At constant 1-octene and ethene concentration (constant ethene/1-octene feed molar ratio) 1-octene incorporation decreased with increasing temperature. Furthermore, when ethene/1-octene molar ratio was varied by varying the temperature keeping 1-octene concentration and ethene pressure constant, increasing temperature accounted for lower molecular masses without affecting 1-octene incorporation. An explanation for the observed temperature dependence of the copolymerization parameters is presented, considering the solution-enthalpy of the gaseous ethene in the solvent. In all cases amorphous poly(ethene-co-1-octene) with 1-octene content varying between 20 and 40 mol % was obtained. © 1997 John Wiley & Sons, Inc.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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  • 6
    Digitale Medien
    Digitale Medien
    Model of partial crystallization and melting derived from small-angle X-ray scattering and electron microscopic studies on low-density polyethylene (1980)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 18 (1980), S. 1361-1381 
    Details
    ISSN: 0098-1273
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: A temperature-dependent small-angle x-ray scattering and electron microscopic study on a sample of low-density polyethylene affords a determination of the structure changes in a heating and cooling cycle and suggests a new model of partial crystallization and melting. The analysis of SAXS data is based upon some general properties of the electron-density correlation function. Electron micrographs are obtained from stained sections γ irradiated at elevated temperatures and are analyzed quantitatively by statistical means. According to the model proposed here the thickness distribution in the amorphous layers, rather than that of the crystalline regions, is the essential factor governing the crystallization and melting behavior. The temperature-dependent changes in this thickness distribution provide a natural explanation for the large reversible changes in long-spacing.
    Zusätzliches Material: 16 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1980.180180615
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