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  • 1
    Electronic Resource
    Electronic Resource
    Frictional Electrification (1949)
    [s.l.] : Nature Publishing Group
    Nature 163 (1949), S. 172-172 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] RECENT experiments on the so-called frictional electrification produced when dielectrics slide over conductors appear to throw light on the mechanism of its production. Small cubes of ebonite or a measured volume of sand were allowed to slide down an earth-connected inclined metal plane ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/163172a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Laser measurements of coral growth (1997)
    [s.l.] : Nature Publishing Group
    Nature 386 (1997), S. 30-31 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Calcification in reef-building corals is highly variable and strongly affected by environmental factors1, especially light, temperature, water motion and pollution2. The mechanisms by which environmental influences alter calcification are not well understood3"5, but it is widely accepted that ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/386030a0
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  • 3
    Electronic Resource
    Electronic Resource
    Electrification of Liquid Drops (1949)
    [s.l.] : Nature Publishing Group
    Nature 164 (1949), S. 1003-1003 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IT has been known for some time that electrification is produced when water breaks into drops, one of the earliest observations being made by Lenard, who found charged drops in the vicinity of a waterfall. This phenomenon is of interest in many ways, one of the most important being in connexion ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1641003a0
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  • 4
    Electronic Resource
    Electronic Resource
    Frictional Electrification of Sand (1948)
    [s.l.] : Nature Publishing Group
    Nature 162 (1948), S. 568-569 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A VERY simple experiment seems to have a meteorological significance. A small plate about one square inch in area was attached to the insulated quadrant of a Dolezalek electrometer. A cupful of fairly dry sand was then poured through a funnel and allowed to fall some three feet to the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/162568b0
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  • 5
    Electronic Resource
    Electronic Resource
    Low-Pressure Electrical Discharges (1947)
    [s.l.] : Nature Publishing Group
    Nature 159 (1947), S. 404-405 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SOME experiments awaiting publication show how remarkably easy it is to start high-frequency electrodeless discharges at pressures of the order of 1/100 or even 1/1,000 mm. of mercury in a uniform electric field. For a bulb of given size, the wave-lengths must be less than a certain value which ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/159404a0
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  • 6
    Electronic Resource
    Electronic Resource
    Quantitative Structure–Activity Relationships (QSAR) of Cinnamic Acid Bird Repellents (1999)
    Springer
    Journal of chemical ecology 25 (1999), S. 2825-2845 
    Details
    ISSN: 1573-1561
    Keywords: Cinnamic acids ; bird repellents ; quantitative structure–activity relationship ; dose–response ; pigeon ; Columba livia ; crop protection ; feeding deterrent
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Plants have evolved an array of defense chemicals that inhibit the feeding of vertebrate herbivores and therefore have potential for agricultural and environmental applications to reduce feeding damage. We investigated the relationship between structure and repellency for 14 derivatives of the plant secondary compound, cinnamic acid, using the feral pigeon (Columba livia) as the test species. The mechanism behind the repellent activity of these derivatives is explained by a combination of four descriptors: heat of formation (ΔH f), polarizability (XY and YY) and superdelocalizability (Sr). All these parameters are electronic, indicating that changes in electronic distribution within cinnamic acid structures are crucial for activity. This is the first published quantitative structure–activity model for avian repellents, and as a result we can now begin to predict which cinnamic acid derivatives should make effective repellents. The full power of this model to aid the selection and screening of new repellents awaits further experimentation on both related compounds and other avian species. However, this modeling approach promises to provide a more efficient and economic method for prospecting chemical databases for new effective bird repellents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1020863927061
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  • 7
    Electronic Resource
    Electronic Resource
    Evaluation of anti-sheep tree-stem-protection products in silvopastoral agroforestry (1996)
    Springer
    Agroforestry systems 34 (1996), S. 259-264 
    Details
    ISSN: 1572-9680
    Keywords: Acer pseudoplatanus ; damage ; Fraxinus excelsior ; herbivory ; plastic tree-shelters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Direct herbivore damage to trees in temperate silvopastoral agroforestry systems is a major management consideration. Individual plastic tree-shelters may sometimes cause poor tree development and they have limited life span. Therefore, some alternative tree-shelter products were tested on four year old Acer pseudoplatanus and Fraxinus excelsior. Damage to the main stem was assessed by determining the area of bark removed by sheep browsing. Wobra®, a paint-on abrasive substance applied to the main stem, was effective in reducing sheep damage. However, some damage did occur due to breach of the protective barrier as a result of stem diameter increases and its removal through rubbing by animals. Anipel®, a systemic bittering agent supplied through the root system, was not effective in preventing significant damage compared to no-treatment controls, possibly because of poor uptake of the active ingredient into the tree. Within treatments, there were significant differences in damage incurred. Most notably Fraxinus suffered more damage than Acer, an effect which may be related to differences in tree size and/or relative palatability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00046926
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  • 8
    Electronic Resource
    Electronic Resource
    The chromosomal distributions of Ty1-copia group retrotransposable elements in higher plants and their implications for genome evolution (1997)
    Springer
    Genetica 100 (1997), S. 197-204 
    Details
    ISSN: 1573-6857
    Keywords: in situ ; hybridization ; centromeres ; retrotransposons ; genome organization ; evolution ; sequence evolution ; Arabidopsis ; barley
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Retrotransposons make up a major fraction – sometimes more than 40% – of all plant genomes investigated so far. We have isolated the reverse transcriptase domains of the Ty1-copia group elements from several species, ranging in genome size from some 100 Mbp to 23 000 Mbp, and determined the distribution patterns of these retrotransposons on metaphase chromosomes and within interphase nuclei by DNA:DNA in situ hybridization. With some exceptions, the reverse transcriptase domains were distributed over the length of the chromosomes. Exclusion from rDNA sites and some centromeres (e.g., slash pine, 23 000 Mbp, or barley, 5500 Mbp) is frequent, whereas many species exclude retrotransposons from other sites of heterochromatin (e.g., intercalary and centromeric sites in broad bean). In contrast, in the plant Arabidopsis thaliana, widely used for plant molecular genetic studies because of its small genome (c. 100 Mbp), the Ty1-copia group reverse transcriptase gene domains are concentrated in the centromeric regions, collocalizing with the 180 bp satellite sequence pAL1. Unlike the pAL1 sequence, however, the Ty1-copia signal is also detectable as weaker, diffuse hybridization along the lengths of the chromosomes. Possible mechanisms for evolution of the contrasting distributions are discussed. Understanding the physical distribution of retrotransposons and comparisons of the distribution between species is critical to understanding their evolution and the significance for generation of the new patterns of variability and in speciation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018337831039
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  • 9
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    Evaluation of anti-sheep tree-stem-protection products in silvopastoral agroforestry (1996)
    Springer
    Details
    Publication Date: 1996-06-01
    Print ISSN: 0167-4366
    Electronic ISSN: 1572-9680
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Springer
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  • 10
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    Frictional Electricity (1948)
    American Physical Society
    Details
    Publication Date: 1948-10-01
    Print ISSN: 0031-899X
    Electronic ISSN: 1536-6065
    Topics: Physics
    Published by American Physical Society
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