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  • 1985-1989  (9)
  • 1988  (9)
  • 1
    Electronic Resource
    Electronic Resource
    Spatial variation in response to odorants on the rat olfactory epithelium (1988)
    Springer
    Cellular and molecular life sciences 44 (1988), S. 208-211 
    Details
    ISSN: 1420-9071
    Keywords: Electro-olfactogram ; olfaction ; spatial patterning ; nicotine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary We have measured the electro-olfactogram produced by four odorants, nicotine, i-pentyl acetate, i-pentanoic acid and cineole from twelve positions on an in vitro preparation of rat olfactory tissue. Each odorant shows a different pattern of response over the twelve positions which can be explained by differences in olfactory receptor populations between regions of the rat olfactory epithelium. The result for nicotine is further evidence that there are olfactory receptors which are stimulated by nicotine when it is presented as a vapour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01941707
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Spin-wave energies in ferromagnetic nickel alloys (abstract) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3830-3830 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An expression is derived for the spin-wave stiffness constant D in a ferromagnetic metallic alloy. The formalism is based on a multiorbital tight-binding model and the Hartree–Fock approximation. Both diagonal and off-diagonal disorder are taken into account. Results for Ni-Fe, Ni-Co, and Ni-Cu alloys are obtained within the coherent potential approximation (CPA) and compared with previous calculations and experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340629
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    NMR in pure3He films on a Nuclepore substrate (1988)
    Springer
    Journal of low temperature physics 72 (1988), S. 213-239 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The properties of3He films on a Nuclepore substrate have been measured by pulsed NMR at a Larmor frequency of 10 MHz between 1.3 and 4.2 K. The3He film thickness was varied from 0.14 to 2 layers. The spin-spin relaxation timeT 2 agrees well with previous measurements of3He films on Mylar and Vycor glass at low temperatures. The spin-lattice relaxation timeT 1 for submonolayer films shows a strong temperature dependence consistent with a thermally activated process. This behavior has not previously been observed on amorphous substrates. The spin diffusion coefficient was measured for the thickest films at 4.2 and 2.6 K and found to be consistent with free atom motion of the3He in the vapor. In thin films or at low temperatures, the diffusion was too small to be observed. The magnetic coupling between the3He nuclei in a film and the protons in the Nuclepore substrate was determined from the effect of the3He on the proton-lattice relaxation time. It is about 100 times weaker than the interaction between3He and the fluorine nuclei in a Teflon substrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00682097
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Osmoacclimation in Enteromorpha intestinalis: long-term effects of osmotic stress on organic solute accumulation (1988)
    Springer
    Marine biology 98 (1988), S. 467-476 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effects of salinity variation on organic solute accumulation have been studied in marine Enteromorpha intestinalis (L.) Link (St. Andrews, Fife, National Grid Ref. NO 514168, and Fife Ness, Fife, National Grid Ref. NO 638098) collected from upper mid-shore rock pools from January to July 1987; and in freshwater E. intestinalis (Forfar Loch, Angus, National Grid Ref. NO 440504) collected during August 1986, in short-term (48 h) and long-term (35 d) experiments. The tertiary sulphonium compound β-dimethylsulphoniopropionate (DMSP) was the principal organic osmolyte in unstressed cells; marine plants contained greater amounts of DMSP than freshwater plants. Exposure to increased salinity resulted in the short-term accumulation of proline and sucrose, while DMSP was unchanged in freshwater and marine plants. In longer-term exposure to salt stress, sucrose levels declined while DMSP increased and proline levels remained high. Long-term incubation in hypersaline media increased the tissue protein and chlorophyll levels of marine E. intestinalis; this may be linked to changes in the cytoplasm:vacuole ratio of the cell. Prolonged exposure to hyposaline and hypersaline conditions led to changes in DMSP content in the manner predicted for an osmotic effector, suggesting that DMSP is involved in long-term osmoacclimation in Enteromorpha spp. The results are also consistent with the proposal that DMSP acts as a compatible cytosolute in Enteromorpha species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00391537
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  • 5
    Electronic Resource
    Electronic Resource
    High transverse momentum prompt photon production by π− and π+ on protons at 280 GeV/c (1988)
    Springer
    The European physical journal 37 (1988), S. 535-544 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The inclusive cross sections for prompt photon production by π− and π+ on protons have been measured with a beam momentum of 280 GeV/c using a fine grained electromagnetic calorimeter and the CERN Omega spectrometer. The transverse momentum and Feynmanx F ranges covered are 4.0〈p T 〈7.0GeV/c and −0.45〈x F 〈0.55 respectively. A quantitative comparison of the prompt photon cross section with next-to-leading order QCD predictions using Duke and Owens structure functions is performed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01549712
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Production of high transverse momentum prompt photons and neutral pions in proton-proton interactions at 280 GeV/c (1988)
    Springer
    The European physical journal 38 (1988), S. 371-382 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The inclusive cross sections for production of prompt photons and π0 s by 280 GeV/c protons incident on a liquid hydrogen target, have been measured forp T in the range 4.0 to 6.5 GeV/c and for |x F |〈0.45. A quantitative comparison of the prompt photon cross section with next-to-leading order QCD predictions using Duke and Owens structure functions is performed. Phenomenological fits to the π0 and prompt photon cross sections are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01584385
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  • 7
    Electronic Resource
    Electronic Resource
    Thermoplastic matrix controlled-release zinc fertilizers (1988)
    Springer
    Nutrient cycling in agroecosystems 17 (1988), S. 235-250 
    Details
    ISSN: 1573-0867
    Keywords: Zinc fertilizer ; controlled-release
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Thermoplastic matrix controlled-release (C.R.) zinc fertilizers are produced by extruding a mixture of zinc salt and inert polymer material. Three methods of laboratory evaluation were used to characterize a range of C.R. zinc formulations differing in concentration and nature of zinc salt, carrier matrix, and size. The methods were (i) electron microscopy, (ii) zinc emission into water, and (iii) zinc diffusion in indicator-agar. These methods complemented each other, with electron microscopy elucidating physical features governing zinc release from the fertilizer pellets. Finely divided particles of soluble zinc salt, for instance, were associated with formulations whose release characteristics approached theoretical (time)0.5 -order release kinetics. Apart from zinc particle size, other factors controlling zinc emission characteristics were the type of zinc salt, the zinc loading, and pellet size. Varying the polymer matrix materials had little or no effect on zinc release from the C.R. zinc formulations compared in this study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01049580
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  • 8
    Electronic Resource
    Electronic Resource
    Thermoplastic matrix controlled-release zinc fertilizers (1988)
    Springer
    Nutrient cycling in agroecosystems 17 (1988), S. 251-266 
    Details
    ISSN: 1573-0867
    Keywords: Zinc ; controlled-release ; diffusion ; pH ; temperature ; phosphate ; clay ; sand ; moisture content
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The emission and movement of zinc from planar arrangements of controlled-release (C.R.) thermoplastic matrix zinc fertilizer formulations was studied in cylindrical diffusion cells packed with a clay or a sand. The influences of a number of soil characteristics known to affect zinc diffusion were also investigated. Zinc emission was initially (over 2 days) very rapid. The rate declined markedly thereafter. Morphologically distinct C.R. zinc formulations released zinc at different rates. Zinc moved appreciably and consistently further in the sand than in the clay. Of the soil characteristics studied, increasing phosphate levels had no effect upon zinc emission or mobility in either soil. Increasing pH in the sand did not affect zinc emission, but decreased zinc mobility. Conversely, in the two soils, increasing temperature stimulated zinc emission, but had little influence on zinc mobility. At higher water contents, zinc release was increased in both soils. However, zinc movement was only increased in the sand.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01049581
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  • 9
    Electronic Resource
    Electronic Resource
    Thermoplastic matrix controlled-release zinc fertilizers (1988)
    Springer
    Nutrient cycling in agroecosystems 17 (1988), S. 267-283 
    Details
    ISSN: 1573-0867
    Keywords: Zinc ; controlled-release ; linseed
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Thermoplastic matrix controlled-release (C.R.) zinc fertilizers were compared as zinc sources for linseed (Linum usitatissimum) grown on a zinc-deficient sand and a zinc-deficient clay. C.R. formulations differed in characteristics including origin (different extruders), type of zinc salt, and polymer matrix blends. Conventional fertilization with pure zinc salts was also included in the comparison. C.R. formulations based on zinc oxide (ZnO) were ineffective zinc sources, linseed growth and tissue zinc concentrations being similar to untreated controls. However, both zinc sulphate (ZnSO4·H2O)- and zinc chloride (ZnCl2)-based formulations were effective zinc fertilizers. A group of ZnSO4·H2O-based formulations produced in Melbourne (Australia) gave relatively higher plant zinc concentrations than similar formulations produced on a different extruder in Akron (U.S.A.). Varying the type of plastic or the blend of plastics constituting the matrices of the C.R. products had no consistent effects on tissue zinc concentrations or plant growth. Similarly, no specific benefit of C.R. over conventional zinc fertilization was established under the conditions of the present experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01049582
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