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  • Springer  (34)
  • American Chemical Society  (4)
  • 2000-2004  (19)
  • 1975-1979  (19)
  • 1920-1924
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  • 1
    Digitale Medien
    Digitale Medien
    Effect of polyenyl phosphatidyl choline on clofibrate-induced increase in LDL cholesterol (1979)
    Springer
    European journal of clinical pharmacology 15 (1979), S. 15-19 
    Details
    ISSN: 1432-1041
    Schlagwort(e): clofibrate ; polyenyl phosphatidyl choline ; hyperlipoproteinemia ; LDL cholesterol ; coronary heart disease
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary In a double-blind, randomised, cross-over trial clofibrate and a combination of polyenyl phosphatidyl choline (PPC) plus clofibrate were tested in 67 patients with hyperlipoproteinemia. Each treatment lasted for 4 weeks and was separated by a 4 week placebo period. The daily doses were clofibrate 1.2 g and PPC 1.8 g + clofibrate 1.2 g, respectively. The results revealed that polypenyl phosphatidyl choline prevented the elevation of LDL-cholesterol induced by clofibrate treatment, and that the lipid-lowering potency of the combination did not differ significantly from that of clofibrate. Since elevation of LDL-cholesterol is considered to increase the risk of coronary heart disease, the combination appears to offer a therapeutic advantage. Despite the significance of this clinical observation, a final decision may only be obtained from a prospective, long term investigation in patients with coronary heart disease and hyperlipoproteinemia.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00563553
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Determination of the measuring position in laser-Doppler anemometry (2004)
    Springer
    Experiments in fluids 6 (2004), S. 105-110 
    Details
    ISSN: 1432-1114
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The present paper is concerned with the determination of the measuring position of a laser-Doppler anemometer (LDA) relative to a wall. The proposed method is based on the finding that the output of a hot-wire anemometer increases when the wire, which is mounted in quiescent air parallel to the wall, is brought closer than 800 μm to the wall. For given hot-wire anemometer parameters, the hot-wire anemometer output voltage depends on the wall material and the wire distance from the wall. After suitable calibration for the wall material of the test section, the anemometer reading in a test rig can be used to find the wire position. Moving the measuring volume of a LDA-system across the wire yields an output voltage variation of the LDA-photomultiplier showing a Gaussian shape. When the maximum output voltage is reached, the centre of the measuring control volume is located at the centre of the wire and, hence, the location of the LDA-measuring position is known. All position measurements for the LDA-system are then taken relative to this point using the scale of the LDA-traversing system. If optical effects of transparent test section walls are eliminated by employing refractive index matched liquids, there are other ways to find the measuring position of a laser-Doppler anemometer relative to a wall. One such method and its application to the study of the turbulent near wall flow in a pipe is described in this paper.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00196460
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  • 3
    Digitale Medien
    Digitale Medien
    Characterization of an ethylene receptor family with differential expression in rose (Rosa hybrida L.) flowers (2000)
    Springer
    Plant cell reports 19 (2000), S. 1232-1239 
    Details
    ISSN: 1432-203X
    Schlagwort(e): Keywords Abscisic acid ; Ethylene ; ETR homologues ; Flower senescence ; Rosa hybrida ; Abbreviations ABA Abscisic acid ; DIG Digoxigenin ; SSC Standard saline citrate
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract  To analyze differences in flower longevity and ethylene sensitivity, we isolated Rosa hybrida gene fragments with sequence similarity to the Arabidopsis thaliana ethylene receptor gene-family. A rose gene (RhETR1) highly similar to AtERS1 had been previously sequenced. Here, we report the isolation of three additional partial rose genes (RhETR2–4) belonging to different sub-groups of ethylene receptor genes. RhETR2 clusters with AtETR1, RhETR4 with AtERS1 and RhETR1, whereas RhETR3 shows high sequence similarity to AtETR2 and AtERS2. Expression analysis of RhETR2 and RhETR3 revealed that they are differentially expressed. RhETR2 is expressed at a constitutive level throughout flower development whereas RhETR3 expression increases in senescing flowers of the cultivar Bronze which has a short floral life while it remains at low levels in the long-lasting flowers of the cultivar Vanilla. Expression of both genes was increased by ABA and ethylene treatment, but transcript abundance differed between rose cultivars with different postharvest performance. These results indicate that differences in flower life among rose cultivars could be due to differences in receptor levels.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002990000251
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  • 4
    Digitale Medien
    Digitale Medien
    Electron Spectroscopy of Single-Layer (n = 1) Bi2Sr2−xLaxCuO6+δ Crystals at Optimal Doping (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 883-887 
    Details
    ISSN: 1572-9605
    Schlagwort(e): high-temperature superconductors ; angle-reserved photoemission ; x-ray absorption spectroscopy ; electronic structure ; cuprate superconductors
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract On single crystals of the single-layer (n = 1) high-T c superconductor Bi2Sr2−x La x CuO6+δ at optimal doping (x = 0.4), the electron spectroscopies x-ray absorption (XAS) and high-resolution angle-resolved photoemission (ARPES) were performed. The XAS gives the intensity of the so-called prepeak of the O 1s line what is due to the unoccupied part of the Zhang–Rice (ZR) singlet band. For ARPES, the advantages of single-layer material are the absence of bilayer effects and the possibility to study the electronic properties of the normal state at a sample temperature where the thermal broadening is extremely small (〈10 meV). The controlled variation of the polarization vector of the synchrotron radiation made it possible to resolve a distinct fine-structure of the occupied part of the ZR singlet band at the Fermi level. These observations have enormous consequences for line shape analyses and the determination of pseudogaps, and thus the mechanism of high-T c superconductivity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1026430432376
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  • 5
    Digitale Medien
    Digitale Medien
    The “Authoring on the Fly” system for automated recording and replay of (tele)presentations (2000)
    Springer
    Multimedia systems 8 (2000), S. 158-176 
    Details
    ISSN: 1432-1882
    Schlagwort(e): Key words: Multimedia authoring – Electronic note-taking – Real-time random access – Stream synchronization – Educational software
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik
    Notizen: Abstract. We discuss the problem of capturing media streams which occur during a live lecture in class or during a telepresentation. Instead of presenting yet another method or system for capturing the classroom experience, we introduce some informal guidelines and show their importance for such a system. We derive from these guidelines a formal framework for sets of data streams and an application model to handle these sets so that a real-time replay becomes possible. The Authoring on the Fly system is a possible realization of a framework which follows these guidelines. It allows the capture and real-time replay of data streams captured during a (tele)presentation, including audio, video, and whiteboard action streams. This article gives an overview of the different AoF system components for the various phases of the teaching and learning cycle. It comprises an integrated text and graphics editor for the preparation of pages to be loaded by the whiteboard during the presentation phase. The recording component of the system captures various data streams of the live presentation. They are postprocessed by the system so that they become instances of the class of media for whose replay the general application model was developed. From a global point of view, the Authoring on the Fly system allows one to merge three apparently distinct tasks – teaching in class, telepresentation, and multimedia authoring – into one single activity. The system has been used routinely for recording telepresentations over the MBone net and has already led to a large number of multimedia documents which have been integrated automatically into Web-based teaching and learning environments.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s005300000042
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Tetraaza[14]annulen-Derivate und ihre Vorstufen. 1. Mitt. Niedermolekulare Modellverbindungen (1978)
    Springer
    Colloid & polymer science 256 (1978), S. 90-90 
    Details
    ISSN: 1435-1536
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01746734
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Tetraaza[14]annulen-Derivate und ihre Vorstufen. 2. Mitt. Bicyclische Verbindungen und polymere Substanzen (1978)
    Springer
    Colloid & polymer science 256 (1978), S. 308-308 
    Details
    ISSN: 1435-1536
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01550735
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Precision measurement of the nuclear magnetic dipole moment of175Lu by optical pumping of free Lu+ ions (1975)
    Springer
    The European physical journal 275 (1975), S. 305-311 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Nuclear spin polarization in the 4f 146s 2 1 S 0 ground state of175Lu+(I=7/2) ions is achieved by optical pumping with the resonance line (1 S 0-1 P 1,λ=261.5 nm). Nuclear magnetic resonance of the free ions in He buffer gas yields for the magnetic dipole momentμ(175Lu)=2.2240(11)μ n (with diamagnetic correction). This value can be used for a more accurate determination of the magnetic dipole moments of other Lu isotopes from knownA factor ratios. A comparison with nuclear induction measurements in solids results in the chemical shiftsδ(LuB12)=−23(5)·10−4 andδ(LuSb)= −31(5)·10−4.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01434016
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    Surface induced reactivity for titanium by ion implantation (2000)
    Springer
    Journal of materials science 11 (2000), S. 383-391 
    Details
    ISSN: 1573-4838
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin , Technik allgemein
    Notizen: Abstract Calcium and phosphorus storage in a thin layer of titanium surface was achieved by ion implantation. We study the reactivity of this surface in response to a hydrothermal treatment. The incipient implanted species are observed to convert to Ca2+ and PO4 3-, the precursors for generating calcium phosphate polymorphs. Hydroxyapatite is formed from these precursors by an interface-liquid mediated mineralization preceded by the hydrolysis of oxygen compounds of Ca and P from the solid phase. The morphology and organization of apatite mineral is controlled by the fluid dynamics reflecting the surface remodeling to adapt to the available local environment. Exposed to calcium and phosphate ion containing solution, the hydrothermally treated surface templates hydroxyapatite deposition. Ca and P implanted Ti surface was shown to be chemically and morphologically actively involved in the interfacial reactions. ©2000 Kluwer Academic Publishers
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1008938125348
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  • 10
    Digitale Medien
    Digitale Medien
    Calculation of Magnetic Properties and Specific Heat for the Nuclear Enhanced Ferromagnet PrNi5 (2000)
    Springer
    Journal of low temperature physics 120 (2000), S. 401-434 
    Details
    ISSN: 1573-7357
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A general model hamiltonian for hyperfine enhanced magnetic materials is presented. The use of the model is not limited only to the nuclear regime, but the model treats also situations when the strength of the exchange interaction is close to and above the threshold value. The model is solved numerically for PrNi5 and the results are compared with recent ultra-low temperature experiments. In particular, the behavior of magnetization, susceptibility, and specific heat of PrNi5 is studied for two external field geometries and anisotropic properties are pointed out. The effect of the quadrupole interaction is examined in detail. The question of the correlations among interacting ions is also addressed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1004692821396
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