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  • Electronic Resource  (7)
  • 1985-1989  (7)
  • 1935-1939
  • 1988  (7)
  • 1
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 6898-6910 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The title reaction is studied using guided ion beam mass spectrometry. Absolute reaction cross sections are measured as a function of kinetic energy from thermal to 40 eV, and three endothermic product channels are observed. The dominant SiF++SiF3 channel is only slightly endothermic, while the SiF+3 +SiF and SiF+2 +SiF2 channels have much higher thresholds. The SiF+3 cross section magnitude is about half that of SiF+, while the SiF+2 cross section is an order of magnitude smaller than that of SiF+. A second feature which appears in the SiF+2 cross section is due to dissociation of SiF+3 . There is evidence that SiF+ and SiF+3 are produced via a direct mechanism. Competition between these two channels is interpreted in terms of molecular orbital correlations and qualitative potential energy surfaces. One surface is found to correlate only with the SiF+3 +SiF channel, while another correlates diabatically with this channel and adiabatically with the SiF++SiF3 channel. Competition on this latter surface has an energy dependence which is consistent with the Landau–Zener model. Reaction thresholds are analyzed to yield 298 K heats of formation for SiFx and SiF+x species. From an evaluation of these and literature values, we recommend the following values: ΔH0f(SiF+) =170.4±2.2 kcal/mol, IP(SiF)=7.54±0.16 eV, ΔH0f (SiF3)=−258±3 kcal/mol, and IP(SiF3)=9.99±0.24 eV.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3118-3118 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Materials exhibiting strong Faraday rotation are of interest for components in laser systems. These include optical isolators, circulars, modulators, and switches in sizes ranging from microdevices for integrated optics to 30-cm-diam rotators for Nd:glass lasers used in inertial confinement fusion research. Properties of diamagnetic, paramagnetic, ferromagnetic, dilute magnetic semiconductors and free carrier rotators have been evaluated for various laser applications and for operation in the spectral range from the infrared to the ultraviolet and at various temperatures. Both crystalline and amorphous materials are considered; forms include bulk materials, fibers, and thin films. The characteristics of selected materials, including bismuth-substituted rare-earth iron garnets, Cd1−xMnxTe, and rare-earth doped glasses and crystals, are discussed. Relative figures of merit based on specific rotation, losses, cost, and special properties such as the nonlinear refractive index are also given.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Planta 175 (1988), S. 39-49 
    ISSN: 1432-2048
    Keywords: Calcium (chlorotetrcycline fluorescence) ; Ceratodon ; Monensin ; Phototropism (moss) ; Phytochrome (moss) ; Protonema (moss) ; Tip growth (moss protonema)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A phytochrome-regulated phototropic response of the moss Ceratodon purpureus was investigated. Chlorotetracycline (CTC) was used to visualize membrane-associated calcium gradients in the tip cell of moss caulonemal filaments. A tip-to-base Ca2+ gradient was observed. The ionophore monensin rapidly inhibited the growth of the tip cell and abolished the CTC fluorescence. Six hours after transferring to inhibitor-free medium, protonemal growth resumed and reached the normal growth rate within 12 h. The growth was accompanied by a reappearance of the CTC-fluorescence gradient. Unilateral irradiation given during the monensin treatment or after the treatment during the period when growth inhibition persisted led, with the re-initiation of growth, to a typical positive phototropic bending in complete darkness. Far-red light applied just before the growth response started, or during growth inhibition, abolished the phototropic response. The phytochrome-mediated signal was qualitatively (position) and quantitatively (degree of bending) memorized. Signal perception and response could be separated temporally. This result indicates that at least under some circumstances, e.g. under the influence of monensin, the phytochrome-mediated signal can be stored for several hours in darkness. Calcium seems to be essential for the processing of polar growth only. A specific function (second messenger) in phytochrome-dependent signal transduction could not be confirmed.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 66 (1988), S. 892-898 
    ISSN: 1432-1440
    Keywords: Diabetic nephropathy ; Urine analysis ; Albumin ; Single proteins ; α-1-microglobulin ; SDS-PAGE ; Diabetische Nephropathie ; Harnanalyse ; Albumin ; Einzelproteine ; α-1-Mikroglobulin ; SDS-PAGE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Zahlreiche Untersuchungen haben in den vergangenen 10 Jahren belegt, daß die Quantifizierung von Albumin im Urin zur frühzeitigen Diagnose der diabetischen Nephropathie geeignet ist. Dabei wurde die Albuminbestimmung aufgrund ihrer hohen Treffsicherheit bei geringem methodischen Aufwand in den Vordergrund gehoben. Die parallele Untersuchung des Harnproteinspektrums mittels SDS-Polyacrylamidgelektrophorese zeigt jedoch, daß auch andere hoch- und niedermolekulare Proteine in den verschiedenen Stadien der diabetischen Nephropathie vermehrt ausgeschieden werden, so daß eine Erweiterung der reinen Albuminbestimmung um je ein makromolekulares (z.B. Transferrin) und ein mikromolekulares (z.B. α-1-Mikroglobulin) Protein sinnvoll erscheint. Nach der vorliegenden Untersuchung können beide Verfahren (kombinierte quantitative bzw. qualitative Analyse) in der Frühdiagnostik und der Verlaufskontrolle der diabetischen Nephropathie eingesetzt werden.
    Notes: Summary During the last ten years, several studies proved the applicability of urinary albumin quantification in the early diagnosis of diabetic nephropathy. Owing to its high accuracy and its comparable low methodological effort, only the albumin determination was emphasised. Parallel studies of urinary protein patterns, however, using sodium dodecylsulfate-polyacrylamidegel-electrophoresis demonstrated the increased excretion of other high- and low-molecular mass proteins in different stages of diabetic nephropathy. Consequently an extension of the mere albumin assay including a macromolecular (e.g., transferrin) and a micromolecular (e.g. α-1-microglobulin) protein seems meaningful. According to this study, both methodological lines (combined quantitative and qualitative analysis, respectively) are useful tools in the early detection and the follow up of diabetic nephropathy.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 66 (1988), S. 1196-1196 
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Annals of operations research 16 (1988), S. 149-160 
    ISSN: 1572-9338
    Keywords: Utility theory ; utility function assessment ; bias ; incomplete information
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract The procedure UFAP is presented which allows a decision maker to interactively assess his von Neumann/Morgenstern single attribute utility function. UFAP puts special emphasis on potential biases in the assessment process. In the first part of the procedure three different assessment methods are used to derive ranges for the utility function. Using different methods enables us to point out a possible bias in the elicitation process. In the second part a consistent class of utility functions is derived based on the ranges assessed in the first part. In case inconsistencies between methods arise the decision maker has to reconsider selected preference statements previously given.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 60 (1988), S. 574-574 
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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