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  • 1
    Electronic Resource
    Electronic Resource
    Discharge pattern analysis suggests existence of a low-threshold calcium channel in cold receptors (1991)
    Springer
    Cellular and molecular life sciences 47 (1991), S. 47-50 
    Details
    ISSN: 1420-9071
    Keywords: Cold receptor ; periodic discharge pattern ; transducer process ; low-threshold calcium channel
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The regular periodic activity patterns of mammalian cold receptors have been quantitatively studied. Analysis of the timing of either single impulses or impulse groups demonstrated that the periodic receptor process is maintained independently of impulse generation and continues to operate under conditions when afferent impulses are not initiated. These results imply that the underlying conductances must be operational at threshold potentials related to impulse generation. In addition to temperature, the periodic process is considerably sensitive to calcium, which affects mainly the probability of impulse generation during each cycle. Reduction of external calcium and application of calcium entry blockers with relative selectivity for low-threshold calcium channels are similarly effective in modulating cold receptor activity. The data imply the existence of a low-threshold calcium conductance at the sensory terminal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02041249
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Deaths of Canada geese following spraying of turf with diazinon (1991)
    Springer
    Bulletin of environmental contamination and toxicology 46 (1991), S. 852-858 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01689729
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Degradation of parent compounds of nine organophosphorus insecticides in Ontario surface and ground waters under controlled conditions (1991)
    Springer
    Bulletin of environmental contamination and toxicology 47 (1991), S. 374-380 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01702197
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The ADP/ATP translocator from potato has a long amino-terminal extension (1991)
    Springer
    Current genetics 20 (1991), S. 405-410 
    Details
    ISSN: 1432-0983
    Keywords: ADP/ATP translocator ; Mitochondria ; Presequence ; Gene expression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The ADP/ATP translocator is an abundant protein of the mitochondrial inner membrane, which in fungi and mammals is synthesized without a presequence. Here we report that the translocator from potato has an amino-terminal extension which may function in mitochondrial targeting. Several cDNA clones encoding the nucleotide sequence of the ADP/ATP translocator have been isolated from potato leaf and tuber cDNA libraries constructed in lambda phages. Only one class of cDNA clones was found but possibly different translocator genes are expressed in other tissues. High levels of transcripts for the translocator are found in all tissues analysed. Sequence determination of the complete insert of one of the clones reveals a long open reading frame of 1158 bp encoding a protein of 386 amino acids corresponding to a calculated molecular weight of 42 kDa. In contrast, the ADP/ATP translocator proteins from fungi and mammals are significantly smaller. Comparison of the Neurospora translocator with the potato protein shows about 75% sequence homology, being confined to the region after amino acid 85 of the potato polypeptide. Antibodies directed against the fungal translocator recognize a protein of 30 kDa in the inner membrane of potato mitochondria, suggesting that the mature protein has a similar size as the translocators from fungi and mammals. Thus, the additional segment of the potato ADP/ATP translocator forms an amino-terminal extension which may be involved in the import of the protein into plant mitochondria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317069
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Monitoring air, soil, stream and fish for aerial drift of permethrin (1991)
    Springer
    Environmental monitoring and assessment 16 (1991), S. 137-150 
    Details
    ISSN: 1573-2959
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Permethrin drift from two aerial applications at each of two sites in a potato growing area in Ontario were measured to a maximum distance of 61 m outside the treatment area. Droplet drift did not enter the adjacent surface water streams at either study site, since there was little or no wind on the four occasions. The concentration of the insecticide in soil as a result of drifting off site was significantly lower than the amount deposited on the treatment area. The spray drifting off-target was generally made up of droplets 〈100 μm. Permethrin residues were detected in the water and sediment samples collected after treatment along the Bailey Creek and Beeton Creek; however, these levels did not cause lethal or sublethal effects to aquatic invertebrates and fish species. Based on the conditions and results of this study, it is concluded that a buffer zone of 65 m around sensitive and productive bodies of water would be effective and practical.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00418101
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    A model for the thermorheological behavior of viscoelastic fluids (1991)
    Springer
    Rheologica acta 30 (1991), S. 523-529 
    Details
    ISSN: 1435-1528
    Keywords: Viscoelasticity ; dissipation in transient flows ; nonisothermal rheological constitutive equations ; dissipation in transient flows
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Using a power-law ansatz for the temperature dependence of the shear modulus on the level of internal variables, the thermorheological behavior is modeled for viscoelastic fluids of a special group of rheological constitutive equations (rate-type models). The model parameter introduced characterizes thermoelastic contributions. The relation between the model parameter and the physical quantities appearing in deformation processes is discussed. Based on the chosen temperature dependence of the shear modulus, thermodynamically consistent equations like the nonlinear rheological constitutive equation and the temperature equation are derived. The special cases of entirely entropy and energy elastic fluids are also considered. The thermorheological behavior (exo-, α- or endothermal processes) of a viscoelastic fluid in a stress-growth experiment followed by relaxation is analyzed with respect to the model parameter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00444370
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    Paper (German National Licenses)
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