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  • 1
    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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  • 2
    Electronic Resource
    Electronic Resource
    Atracurium overdose in a small infant (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Anaesthesia 44 (1989), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: An error in setting a syringe driver caused a 2.75 kg infant to receive 37 mg atracurium over 75 minutes. Clinically full recovery of muscle power had returned spontaneously 135 minutes after the infusion was stopped. The child suffered no ill effects. Assay of blood and urine for atracurium and laudanosine conjirmed rapid clearance of the drug.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2044.1989.tb11375.x
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  • 3
    Electronic Resource
    Electronic Resource
    Cortisol and thyroid hormone responses to acid stress in the brown trout, Salmo trutta L. (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 35 (1989), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Individual cannulated brown trout monitored during exposure to acidic water showed increased plasma cortisol after 3 h at pH 4.0 with low (0.05 mm) or high (2.8 mm) calcium (Ca) content, and after 2 days in acidic water with a high Ca content. Most fish did not survive for 2 days in acidic water with a low Ca content. Non-cannulated fish showed a similar increase in mean plasma cortisol after 2 days in high-Ca acidic water (pH 4.0–4.6), but not in acidic water of a low Ca content. After 7 days of exposure to acidic water, plasma cortisol appeared to recover when there was a high Ca content but increased 20-fold when Ca content was low. In cannulated fish severe acid stress resulted in a marked and rapid thyroid response. Plasma thyroxine (T4) was elevated after 3 h exposure to acidic water of both low and high Ca content and remained elevated for 2 days of acid exposure with high Ca. In non-cannulated fish an increase in mean T4 was apparent only after 7 days in low-Ca acidic water. Plasma triiodothyronine (T3) levels were not significantly altered by any of the acid regimes. Plasma glucose of cannulated fish was elevated within 3 h of acid-exposure and remained elevated after 2 days in high-Ca acidic water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1989.tb03394.x
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  • 4
    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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  • 5
    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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  • 6
    Electronic Resource
    Electronic Resource
    Organic solute accumulation in osmotically-stressed Enteromorpha intestinalis (1987)
    Springer
    Marine biology 95 (1987), S. 583-592 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The role of organic solutes in the osmotic adjustment processes of the marine macroalga Enteromorpha intestinalis (L.) Link was investigated in 1986, using fresh samples collected from mid-shore rock pools at Tayport, Fife, Scotland. Natural-abundance 13C nuclear magnetic-resonance spectroscopy revealed β-dimethylsulphoniopropionate (DMSP) to be the only major low molecular weight organic osmolyte present. However, on transfer to a hypersaline medium (300% sea water; 100%=35 S‰), tissue sucrose and proline levels increased markedly, while DMSP remained constant. Recovery of optimal photosynthetic activity and increases in inorganic ion levels occurred over a similar time scale to the changes in sucrose and proline (within 48 h), indicating that these two organic solutes are involved in hyperosmotic adjustment in E. intestinalis while DMSP is not. Freshly-collected plants transferred to 300% sea water medium in the dark showed no significant increases in organic osmolytes. In contrast, starch-enrichment (16 d continuous illumination) led to enhanced synthesis of sucrose and proline in the light and in darkness, but tissue DMSP levels showed no variation throughout. These observations suggest that DMSP is not involved in short-term osmoacclimation in E. intestinalis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00393102
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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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  • 10
    Electronic Resource
    Electronic Resource
    Stomata and sterome in early land plants (1986)
    [s.l.] : Nature Publishing Group
    Nature 323 (1986), S. 438-440 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] To the naked eye the axial fossils, preserved in a grey siltstone dated as early Gedinnian by palynomorphs, are unexceptional with no obvious sporangia. After dissolving the matrix in hydrofluoric acid, the residue contained abundant opaque dark fragments a few millimetres long. These were mounted ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/323438a0
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