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  • Articles  (54)
  • 2000-2004  (24)
  • 1990-1994  (30)
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  • Articles  (54)
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  • 1
    Electronic Resource
    Electronic Resource
    Chain conformation of the Technora copolyamide (1990)
    s.l. : American Chemical Society
    Macromolecules 23 (1990), S. 2843-2848 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00213a004
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  • 2
    Electronic Resource
    Electronic Resource
    Instrument for the remote determination of viscosity and density in hostile environments (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 4192-4195 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A continuous bubble-rise-velocity (BRV) viscometry method was developed for Newtonian fluids which is based upon the remote determination of the rise velocity of a helium bubble. The bubble rise velocity was remotely determined by using a helium-leak detector to measure the rise time of a bubble passing through a constant distance. The density of the fluid was simultaneously obtained from differential pressure measurements in the bubble launch tubes. Empirical equations were developed which allow for calculation of the absolute viscosity and density from several remotely measurable variables: helium gas pressures in the bubble generation and launching system, liquid temperature, and helium concentrations at the liquid/air interface as a function of time. BRV viscometry results for highly viscous liquids (1 Pa s〈viscosity 〈40 Pa s) correlated within ±10% with data obtained with capillary or rotational viscometers. An integrated probe was conceived for the on-line monitoring of viscosity, density, temperature, and liquid level, especially in a hostile environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143233
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  • 3
    Electronic Resource
    Electronic Resource
    Correlation of room temperature photoluminescence to structural properties of ZnSSe/ZnSe superlattices grown by metalorganic vapor phase epitaxy (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 5880-5882 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: ZnS0.1Se0.9/ZnSe strained layer superlattices with up to 120 periods were grown by metalorganic vapor phase epitaxy. We demonstrate the sensitivity of room temperature photoluminescence of these structures for the assessment of the dependence of structural properties on growth conditions. Low temperature photoluminescence (PL) and x-ray diffraction data confirm the results of the room temperature PL measurements. In optimized samples showing highly efficient blue luminescence (2.71 eV) at 300 K heavy-hole and light-hole free exciton recombinations at 11 K and higher-order satellite reflections in the x-ray diffraction profiles were observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354162
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  • 4
    Electronic Resource
    Electronic Resource
    Stabilization and growth interruption effects at ZnSxSe1−x/ZnSe quantum-well interfaces grown by metalorganic vapor-phase epitaxy (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 7181-7187 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: ZnSxSe1−x/ZnSe quantum wells (QW) with and without growth interruption at the interface were grown using atmospheric pressure metalorganic vapor-phase epitaxy. It has been shown that growth interruptions have a major influence on the optical properties of the QW. An interruption of growth in ternary ZnSSe layers causes a quasi-QW photoluminescence (PL), explained by sulfur depletion of the layer. A stabilization is necessary to avoid a quasi-QW. High-quality ZnSSe/ZnSe QWs were achieved by suitable stabilization with H2S and DESe during the growth interruption at the interface, so a sulfur diffusion out of the barrier can be avoided. The QW thicknesses grown under these conditions were in agreement with the nominal well thicknesses, and for stabilized 1-nm QWs we obtain a PL blueshift of 158 meV for x=0.68 and 60 meV for x=0.4 compared to the ZnSe band-edge emission. Characteristic QW-PL transitions at room temperature were observed for unstabilized QW grown with a long interruption time, tp=90 s. The thermal activation energies of the QW excitons investigated by temperature-dependent PL show that with decreasing interruption time an increased binding energy is obtained. The binding energy shows no dependence on the stabilization so that other effects (e.g., interface roughness and sulfur diffusion) may play a role. For QW with a low sulfur content (x=0.4) in the barrier material, we find binding energies which fit to theoretical models. This was not achieved for QWs with x=0.68.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355035
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  • 5
    Electronic Resource
    Electronic Resource
    Fluorescence in situ hybridization polymorphism using two repetitive DNA clones in different cultivars of wheat (2003)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 122 (2003), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Twenty-two wheat cultivars and a wheat line were analysed with two-colour fluorescence in situ hybridization (FISH) using the pSc119.2 and pAs1 repetitive DNA clones to detect if polymorphism could be observed in the hybridization patterns of different wheat cultivars. The FISH hybridization pattern of ‘Chinese Spring’ was compared with wheat cultivars of different origins. Differences were observed in the hybridization patterns of chromosomes 4A, 5A, 1B, 2B, 3B, 5B, 6B, 7B, 1D, 2D, 3D and 4D. Although a low level of polymorphism exists in the FISH pattern of different wheat cultivars, it is possible to identify 17 pairs of chromosomes according to their hybridization patterns with these two probes. This study will help to predict the expected variation in the FISH pattern when analysing wheat genetic stocks of different origin. It is presumed that variation in hybridization patterns are caused by chromosome structural rearrangements and by differences in the amount and location of repetitive sequences in the cultivars analysed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1439-0523.2003.00891.x
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  • 6
    Electronic Resource
    Electronic Resource
    Relationship between the isotopically exchangeable and resin-extractable phosphate of deficient to heavily fertilized soil (2000)
    Oxford, UK : Blackwell Science Ltd
    European journal of soil science 51 (2000), S. 0 
    Details
    ISSN: 1365-2389
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The rate and extent of soil–solution transfer of orthophosphate ions (Pi) depend both on soil solution Pi concentration and on time. This is so both in experiments on sorption–desorption and in those on isotopic exchange. Because the two methods are based on different principles, it is questionable whether they give a similar quantification of Pi transfer.The amount of isotopically exchangeable Pi, E, was determined over periods of 100 minutes and described as a function of both time and Pi concentration in solution for three soil samples taken from field plots having different P fertilizer histories over 26 years of annual application. In separate experiments, amounts of Pi, Qd, were extracted from soil suspensions using three levels of anion exchange resin strips for periods ranging from 10 minutes to 7 days. Both initial and final solution Pi concentrations were measured. These concentrations and periods of resin-contact were used to predict the difference in E, ΔE, between the initial and final states of the suspension–resin system using extrapolations of the equations fitted to the exchange data. Under conditions in which the solution concentration of Pi decreased during extraction the ΔE values and the resin-extracted Pi values, Qd, were equal. It is thus possible, using the description of E, to predict the amount of Pi released from soil suspension knowing the initial and final solution Pi concentrations and the time it took for the system to pass from the initial to the final state. For the soil studied, identical amounts of mobile Pi, i.e. the Pi which participates in the soil–solution dynamics, may therefore be assessed by either isotopic exchange or desorption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2389.2000.00351.x
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  • 7
    Electronic Resource
    Electronic Resource
    Acute effect of ibopamine and isosorbide mononitrate on blood volume distribution in congestive heart failure (1994)
    Springer
    European journal of clinical pharmacology 47 (1994), S. 325-330 
    Details
    ISSN: 1432-1041
    Keywords: Ischaemic heart disease ; Isosorbide mononitrate ; Ibopamine ; regional blood volume ; venous capacitance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Abstract In order to compare ibopamine (IBO), a dopamine congener, with isosorbide mononitrate (ISMN) and to study their interaction in effects on the capacitance vasculature in congestive heart failure (CHF), a prospective, randomized, placebo-controlled, double-blind clinical trial was performed in 32 patients with New York Heart Association class II–IV CHF, randomly assigned to receive single oral doses of placebo, 200 mg IBO, 20 mg ISMN, or both IBO and ISMN. After labelling of red cells with 99mTc, changes in regional radioactivity, indicative of changes in blood volume, were recorded using a γ-camera before and at 30, 60 and 120 min after drug administration. At 30 and 60 min, arterial systolic and pulse pressures were higher with IBO than with ISMN and placebo (for pulse pressure by mean 13.7 mm Hg, 95% confidence interval 4.5–23.0 mm Hg, at 30 min), probably reflecting an IBO-induced rise in stroke volume at unchanged heart rate and mean arterial pressure. IBO did not change regional radioactivity except for a transient increase of 4.4% (0.5–7.6%) in the thorax at 30 min. This was attenuated by concomitant ISMN treatment since, starting at 30 min, the drug increased radioactivity in the legs, compared with patients not receiving the drug, by 8.0% (95% confidence interval 0.2–15.8%), leading to a fall in thoracic and left ventricular radioactivity at 30 min of 3.4% (0.3–7.0%) and 6.4% (0.8–11.9%), respectively, and a fall of 5.5% (0.5–10.5%) in hepatic radioactivity at 60 min. In CHF, arterial vasodilating IBO lacks a peripheral venodilating effect and even transiently increases thoracic blood volume, caused probably by a transient rise in left ventricular afterload. This is attenuated by ISMN, which acutely unloads the left ventricle, thorax and liver by venodilation in extremities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00191163
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  • 8
    Electronic Resource
    Electronic Resource
    Multistage, stochastic models of the cancer process: A general theory for calculating tumor incidence (2000)
    Springer
    Stochastic environmental research and risk assessment 14 (2000), S. 173-179 
    Details
    ISSN: 1436-3259
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract.  The use of complicated models of the cancer process has been limited by the need to have a mathematical framework allowing for a general expansion of the theory of carcinogenesis while maintaining numerically tractable results. A system of ordinary differential equations is derived for calculating tumor incidence in multistage models of carcinogenesis. The resulting system of equations is applicable to nonhomogenous processes (i.e. ones in which the rates change with time, age, etc.). In addition, a solution is given for the case of instantaneous initiation. These formulae can easily be coupled with physiologically-based pharmacokinetic models to link biomarkers of exposure to cancer risks. An example is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00009780
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  • 9
    Electronic Resource
    Electronic Resource
    The role of two distinct subunit types in the architecture of keyhole limpet hemocyanin (KLH) (1991)
    Springer
    Naturwissenschaften 78 (1991), S. 512-514 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01131401
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  • 10
    Electronic Resource
    Electronic Resource
    Inexpensive and universal PC-based bus system for process control and data acquisition (1990)
    Springer
    Medical & biological engineering & computing 28 (1990), S. 505-508 
    Details
    ISSN: 1741-0444
    Keywords: Bus system ; Data acquisition ; Personal computer ; Process control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02441977
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