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  • 1990-1994  (5)
  • Adrenergic receptors  (2)
  • Analytical Chemistry and Spectroscopy  (2)
  • Acid rain
  • Forest soils
  • acid deposition
Source
Material
Years
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Spectral analysis of heart rate variability in bronchial asthma (1992)
    Springer
    Clinical autonomic research 2 (1992), S. 105-111 
    Details
    ISSN: 1619-1560
    Keywords: Asthma ; Heart rate variability ; Spectral analysis ; Respiration ; Autonomic nervous system ; Adrenergic receptors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Sympathetic and parasympathetic activity was evaluated in ten healthy controls, nine asymptomatic, untreated asthmatic subjects and ten asthmatic patients during treatment for acute asthma, by measurement of the variation in resting heart rate using frequency spectrum analysis. Heart rate was recorded by ECG and respiratory rate by impedance plethysmography. Spectral density of the beat-to-beat heart rate was measured within the low frequency band 0.04 to 0.10 Hz (low frequency power) modulated by sympathetic and parasympathetic activity, and within a 0.12 Hz band width at the respiratory frequency mode (respiratory frequency power) modulated by parasympathetic activity. Acute asthmatics had higher heart rates than either of the other two groups; this was probably related to the effects of beta-adrenoceptor agonist medication. Sympathetically mediated heart rate variability (normalized low frequency power) was significantly lower in both asymptomatic (p 〈 0.002) and acute (p 〈 0.02) asthma subjects compared to controls. This is consistent with altered sympathetic/parasympathetic regulation of heart rate in subjects with bronchial asthma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01819665
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Spectral analysis of heart rate variability in the sepsis syndrome (1993)
    Springer
    Clinical autonomic research 3 (1993), S. 5-13 
    Details
    ISSN: 1619-1560
    Keywords: Sepsis syndrome ; Intensive care ; Heart rate variability ; Spectral analysis ; Respiration ; Autonomic nervous system ; Adrenergic receptors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Sympathetic and parasympathetic activity was evaluated on 39 occasions in 17 patients with the sepsis syndrome, by measurement of the variation in resting heart rate using frequency spectrum analysis. Heart rate was recorded by electrocardiography and respiratory rate by impedance plethysmography. The sepsis syndrome was established on the basis of established clinical and physiological criteria. Subjects were studied, whenever possible, during the period of sepsis and during recovery. Spectral density of the beat-to-beat heart rate was measured within the low frequency band 0.04 to 0.10 Hz (low frequency power, LFP) modulated by sympathetic and parasympathetic activity, and within a 0.12 Hz band width at the respiratory frequency mode (respiratory frequency power, RFP) modulated by parasympathetic activity. Results were expressed as the total variability (total area beneath the power spectrum), as the spectral components normalized to the total power (LFPn, RFPn) or as the ratio of LFP/RFP. During the sepsis syndrome, total heart rate variability and the sympathetically mediated component, LFPn were significantly lower than during the following recovery phase (ANOVA,p 〈 0.0001,p 〈 0.01 respectively). Both APACHE II (Acute Physiological and Chronic Health Evaluation) and TISS (Therapeutic Intervention Scoring System) scores showed an inverse correlation with total heart rate variability, logLFP, LFPn and the LFP/RFP ratio (p 〈 0.002 to 0.0001). Sympathetically mediated heart rate variability was significantly lower during the sepsis syndrome and was inversely proportional to disease severity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01819137
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Stemflow nutrient inputs to soil in a successional hardwood forest (1992)
    Springer
    Plant and soil 140 (1992), S. 249-254 
    Details
    ISSN: 1573-5036
    Keywords: acid deposition ; hardwood forests ; nutrient leaching ; soil inputs ; stemflow ; succession
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Stemflow and throughfall from a regenerating (8-year-old) southern Appalachian hardwood forest were collected to examine the relative importance of tree bole nutrient leaching in response to acid deposition. Samples from nine (2 m2) stemflow collection plots were analyzed for four dormant season and 11 growing season rainstorm events. Results showed that, relative to throughfall fluxes, stemflow accounted, on average, for approximately 8.5% of total water reaching the forest floor during both dormant and growing season storms. Relative to foliar leaching, K-, SO4-, and PO4 ions appear to be the most easily leached ions from young tree stems. Proportional nitrate and base cation stemflow fluxes increased significantly (p〈0.05) with growing-season storm-event duration, suggesting that the stemsurface nutrient pool is depleted by precipitation more slowly than the foliar pool. On average, proportional stemflow fluxes of SO4 (12%) and K (14%) were consistently higher than reported maximum values for more mature forest stands, which indicates that small-scale stemflow inputs of ions such as these to the forest floor may be important in early successional ecosystems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00010601
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Translational energy spectroscopy. I. Theory and practical considerations (1993)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 7 (1993), S. 272-281 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Non-dissociative collision processes are classified and the accepted notation is given. The basic kinematics of binary collisions are derived and practical considerations based on Massey's adiabatic criterion together with the effects of pressure and temperature are discussed. A general description of instrumental developments and the performance achieved are given and the predictions of the Wigner spin conservation rule as regards the spectroscopic states of the products are summarized.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290070403
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Single-electron capture spectra for Ar3+ in argon and xenon (1994)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 8 (1994), S. 258-261 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: High-resolution translational energy spectra have been obtained for Ar2+ ions resulting from single-electron capture by 9 keV Ar3+ ions in argon and xenon gas targets. Our result for Ar3+ in argon is broadly in agreement with previous high-resolution studies, but we have further successfully assigned reaction channels to three peaks which were previously observed but not definitively identified. These channels appear to involve capture of a 3s-electron from the target argon atom to form Ar+ ions in the first excited state Ar+[3s3p6 2S]. The capture spectrum for Ar3+ in xenon displays eleven relatively well defined peaks with exothermic energy changes in the range of 4-12 eV. However, these capture channels are difficult to identify with certainty because they involve capture into closely spaced high excited states of Ar2+, and are further complicated by the splitting (1.31 eV) of the ground-state doublet 2P3/2, 1/20 target Xe+ product ion. There are over one hundred competing channels, comprising three entrance and over forty exit channels, within this range of energy change. Tentative assignments of capture channels have been made, guided by electron-core configuration and spin-conservation requirements.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290080307
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    Paper (German National Licenses)
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