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  • 1985-1989  (3)
  • 1989  (3)
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  • 1985-1989  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    On the relaxation oscillation in copper-vapor lasers (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 4068-4070 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The possibility of relaxation oscillations in the laser output of a discharge-pumped copper (CuCl) vapor laser is explained qualitatively considering resonance-radiation trapping and collisional effects for experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343335
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    RENAL INTERACTION OF ATRIAL NATRIURETIC PEPTIDE WITH ANGIOTENSIN II: GLOMERULAR AND TUBULAR EFFECTS (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical and experimental pharmacology and physiology 16 (1989), S. 0 
    Details
    ISSN: 1440-1681
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: 1. The possible interactions between the renal effects of atrial natriuretic peptide (ANP) and angiotensin II (All) were studied in normal sodium-replete human subjects. Recent investigations have suggested that ANP inhibits the pressor and volume-retaining effects of activation of the renin-angiotensin system. Thus, ANP may attenuate the effects of All on renal haemodynamics or tubular transport.2. ANP (0.1 μg/kg per min, 60 min) was intravenously infused into eight normal human subjects with and without pretreatment with enalapril (20 mg, per oral), an inhibitor of the converting enzyme, and during infusion of All (10 mg/kg per min).3. ANP infusion alone caused increases in the urine volume (from 96 ± 23 to 229 ± 44 mL/h, P 〈 0.05) and urinary sodium excretion (from 11.5 ± 1.6 to 20.9 ± 4.2 mEq/h, P 〈 0.05). These changes were accompanied by an increase in the glomerular filtration rate (from 127 ± 9 to 158 ± 9 mL/min, P 〈 0.05). ANP infusion after enalapril administration lowered the mean blood pressure (from 76 ± 2 to 71 ± 3 mmHg, P 〈 0.05) to a level similar to that observed during ANP infusion alone (from 84 ± 2 to 74 ± 2 mmHg, P 〈 0.01), but did not result in a significant diuresis (from 139 ± 23 to 174 ± 51 mL/h) or natriuresis (from 19.7 ± 2.5 to 14.3 ± 3.4 mEq/h, P 〈 0.05). This combined treatment with a converting enzyme inhibitor and ANP reduced both the glomerular filtration rate (160 ± 9 to 141 ± 10 mL/min) and the renal plasma flow (from 775 ± 49 to 570 ± 45 mL/min, P 〈 0.01).4. The antinatriuretic effects of exogenous All were reversed by superimposed ANP infusion (urinary sodium excretion: from 4.8 ± 1.0 to 24.3 ± 5.2 mEq/h, P 〈 0.01). Under these conditions, the glomerular filtration rate increased (from 114 ± 6 to 156 ± 7 mL/min, P 〈 0.05) to levels similar to those observed with ANP infusion alone. In addition the increased tubular sodium reabsorption induced by All was inhibited by concomitant ANP infusion (fractional proximal tubular sodium reabsorption: from 90.7 ± 3.5 to 80.3 ± 16.6%, P 〈 0.05, fractional post-proximal tubular sodium reabsorption: from 91.5 ± 9.8 to 87.6 ± 8.8%, P 〈 0.05).5. These results suggest that ANP interacts with endogenous All particularly in the glomerulus, to cause a diuresis and natriuresis, and also suggest that ANP inhibits All-induced tubular sodium reabsorption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1440-1681.1989.tb01533.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Characteristics of rectifying devices with thin films of polyphthalocyanine (1989)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 190 (1989), S. 2693-2701 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Chemically and thermally stable thin films of polyphthalocyanine were prepared by a simple evaporation-polymerization method. The rectifying characteristics of metal/semiconductor/metal (MSM) type sandwich devices with the film were studied. A Schottky type device metal (Cu, Al, Ti)/polyphthalocyanine/Cu shows reproducible rectifying characteristics when Ti is selected as a counter electrode. The reproducibility is improved by pre-oxidation treatment of the surface of Cu substrate. Best electric parameters for the device are as follows: rectifying ratio = 14; threshold potential difference = 0,61 V; saturation current = 2,5 · 10-6 A · cm-2; barrier height = 0,75 eV; diode ideality parameter = 4,23. Doping of five kinds of quinones [p-benzoquinone (p-BQ), tetrabromo-p-benzoquinone (p-TBBQ) tetrachloro-p-benzoquinone (p-TCBQ) tetrachloro-o-benzoquinone (o-TCBQ) 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ)] and 2,5-cyclohexadien-1,4-diylidenedimalodinitrile (TNCR) in thin films of polyphthalocyanine affected electrocharacteristics in some cases. The diode ideality parameter decreases to 2,17 at 0,90 · 10-6 mol · cm-1 of p-TBBQ, and the rectifying ratio increases to about fourteen times by doping p-TBBQ and p-TCBQ. The doped device shows a rectifying response up to 1 kHz.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1989.021901103
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    Paper (German National Licenses)
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