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  • Acetylene blockage technique  (1)
  • Blood pressure  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Variables controlling denitrification from earthworm casts and soil in permanent pastures (1991)
    Springer
    Biology and fertility of soils 11 (1991), S. 24-29 
    Details
    ISSN: 1432-0789
    Keywords: Denitrification ; Earthworms ; Casts ; Pasture ; Rate determinants ; Acetylene blockage technique
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Denitrification (using the acetylene block method) was determined in earthworm casts and soils from permanent, drained or undrained pasture plots fertilized with 0 or 200 kg N ha-1 year-1 as ammonium nitrate. Rates of N2O production from soil cores were about three times higher from the fertilized than from the unfertilized plots while drainage had a relatively small effect. Denitrification rates from casts were 3–5 times higher than those from soil irrespective of the drainage treatment. Casts generally had higher NO inf3 sup- , NH inf4 sup+ , and moisture contents, and higher microbial respiration rates than soil. Rates of N2O production were determined primarily by NO inf3 sup- supply, secondarily by moisture; available C did not appear to limit denitrification in these pastures. Estimates of the potential contribution of casts to denitrification ranges from 10.1% of 29.3 kg ha-1 year-1 from the unfertilized, drained plot to 22% of 82.5 kg ha-1 year-1 from the fertilized undrained plot.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335829
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Cardiovascular effects of static and dynamic exercise (1988)
    Springer
    European journal of applied physiology 58 (1988), S. 152-157 
    Details
    ISSN: 1439-6327
    Keywords: Static exercise ; Dynamic exercise ; Heart rate ; Blood pressure ; Systolic time intervals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The cardiovascular response to static exercise has often been quantified on the basis of a comparison between static handgrip and dynamic cycling exercise. It is then difficult to make precise comparisons because the physical units of work are not compatible. If the data from dynamic exercise can be used to predict the cardiovascular response to zero movement (static exercise) this would suggest that static exercise is not fundamentally different from dynamic exercise. Using leg extension exercise which lasted for 1 min, a set of weights was lifted repeatedly 50 times/min, through three different distances. On each occasion, the heart rate, systolic time intervals (STI) and systemic arterial blood pressure were monitored non-invasively. Regression analysis of heart rate (HR) or blood pressure (BP) against the distance moved by the weights was used to predict the heart rate or blood pressure that would be expected for static exercise. In addition the same responses were measured following 1 min of static exercise during which the weights were held up but not moved. Five subjects, trained in leg extension exercise, completed the four exercise sessions in a random order. A constant force was produced in each variant of the protocol and in the static exercise it amounted to 50% maximal voluntary contraction (MVC). The forces developed and the distance the weights were lifted were monitored. During this sustained static exercise at relatively low intensity the cardiovascular changes could be predicted from the responses induced by dynamic exercise. It is suggested that other factors are important in determining the cardiovascular response to exercise, not simply the mode.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00636619
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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