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  • 1995-1999  (3)
  • 1985-1989
  • 1930-1934
  • 1925-1929
  • 1920-1924
  • 1905-1909
  • freshwaters  (2)
  • Amphibian  (1)
  • 1
    Electronic Resource
    Electronic Resource
    The impact of nitrogen deposition on upland surface waters in Great Britain: A regional assessment of nitrate leaching (1995)
    Springer
    Water, air & soil pollution 85 (1995), S. 297-302 
    Details
    ISSN: 1573-2932
    Keywords: Acid deposition ; freshwaters ; nitrate ; nitrogen deposition ; Great Britain
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A national dataset of water chemistry collected for critical loads mapping is used to make a regional assessment of surface water nitrate concentrations in Great Britain. The primary data are dominated by high concentrations in lowland regions Where N inputs are dominated by non-atmospheric sources. Land cover data are used to screen out sites with potential catchment sources of N, allowing the evaluation of nitrate leaching due to atmospheric deposition alone. In the screened dataset several upland regions show elevated nitrate concentrations, notably Wales, the Pennines, Cumbria, Galloway and the Cairngorms, and there is a clear relationship between surface water nitrate and total N deposition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00476845
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    GABAergic inhibition shapes frequency tuning and modifies response properties in the auditory midbrain of the leopard frog (1999)
    Springer
    Journal of comparative physiology 185 (1999), S. 479-491 
    Details
    ISSN: 1432-1351
    Keywords: Key words Iontophoresis ; Inferior colliculus ; Amphibian ; Rana pipiens ; Bicuculline ; GABA ; AbbreviationsBIC bicuculline methiodide ; CF characteristic frequency ; DNLL dorsal nucleus of the lateral lemniscus ; eFTC excitatory frequency tuning curve ; GABAγ-amino butyric acid ; IC inferior colliculus ; iFTC inhibitory frequency tuning curve ; PB phasic burst ; PL-1 primary-like 1 ; PL-2 primary-like 2 ; PL-3 primary-like 3 ; PSTH post-stimulus time histogram ; SPL sound pressure level ; SRN superficial reticular nucleus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The functional role of GABAergic inhibition in shaping the frequency tuning of 96 neurons in the torus semicircularis of the leopard frog, Rana pipiens, was studied using microiontophoresis of the GABAA receptor antagonist, bicuculline methiodide. Bicuculline application abolished, or reduced in size, the inhibitory tuning curves of 72 neurons. In each case, there was a concommitant broadening of the excitatory tuning curve such that frequency-intensity combinations that were inhibitory under control conditions, became excitatory during disinhibition with bicuculline methiodide. These effects were observed irrespective of the excitatory tuning curve configuration prior to bicuculline methiodide application. Results indicate an important role for GABA-mediated inhibition in shaping the frequency selectivity of neurons in the torus semicircularis of the leopard frog. Bicuculline application also affected several other response properties of neurons in the leopard frog torus. Disinhibition with bicuculline methiodide increased both the spontaneous firing rate (18 cells) and stimulus-evoked discharge rate (81 cells) of torus neurons, decreased the minimum excitatory threshold for 18 cells, and altered the temporal discharge pattern of 47 neurons. Additional roles for GABAergic inhibition in monaural signal analysis are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003590050409
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Predicting freshwater critical loads from national data on geology, soils and land use (1995)
    Springer
    Water, air & soil pollution 85 (1995), S. 2443-2448 
    Details
    ISSN: 1573-2932
    Keywords: critical loads ; freshwaters ; geology ; soil ; land use ; sensitivity ; acidification ; catchments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Using information on geology, soils and land use, a map has been generated for Great Britain which indicates five classes of sensitivity of surface waters to acidification. This map has been used for designing sampling strategies for mapping critical loads of acidity for freshwaters. This paper evaluates the freshwater sensitivity map using a data set of water chemistry collected as part of the UK critical loads programme. Discriminant analysis was used to predict five critical load classes from information on geology and soil sensitivity for freshwater sites. This showed geology and soil information can correctly predict approximately 50% of all critical loads classes. In addition, 77% of sites fall within one critical loads class of that predicted. Predictions may be improved by including other variables eg altitude and geographical location. Differences between lake, stream and reservoir sites are also examined. Ranges of critical loads values were determined for each of the five classes of surface water sensitivity. While a trend in critical load values was evident between classes, there was significant overlap. A simplified sensitivity map with only three classes related more closely to critical loads values. The paper demonstrates the usefulness of the surface water sensitivity map for assessing acidification at a national scale, but highlights the difficulties of predicting critical loads for individual sensitive catchments using national data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01186200
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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