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  • 33.40.Hp  (3)
  • Agrostis capillaris  (2)
  • Skewness  (2)
  • 3320K  (1)
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Years
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Microwave-optical polarization spectroscopy of theX 2 Σ state of SrF (1983)
    Springer
    Applied physics 30 (1983), S. 105-108 
    Details
    ISSN: 1432-0649
    Keywords: 33.40.Hp ; 35.80.+s
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Hyperfine components in theN=1←0 rotational transition of theX 2Σ state of SrF have been studied with microwave-optical polarization spectroscopy. Of particular interest was the examination of the line shape under the influence of various microwave intensities, cell pressures and small magnetic fields below 1 G. Compensation of the earth's magnetic field with external Helmholtz coils resulted in line widths as small as 600 kHz.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00695463
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A molecular beam laser-microwave double-resonance spectrometer for precise measurements of high temperature molecules (1983)
    Springer
    Applied physics 31 (1983), S. 79-83 
    Details
    ISSN: 1432-0649
    Keywords: 35.80.+s ; 33.40.Hp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A laser-microwave double-resonance experiment has been developped basing on the principle of the known laser-rf double-resonance technique. This novel beam experiment allows high-resolution measurements of rotational transitions in a molecular ground state. The method was applied to the high-temperature radical CaCl to study the hyperfine structure of transitions between low-lying rotational states. Microwave scans yielded linewidths of 15–20 kHz limited only by time-of-flight broadening and residual Zeeman splitting.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00702602
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Accurate determination of wavenumbers for iodine molecular lines in the red spectral region (1989)
    Springer
    Applied physics 48 (1989), S. 463-466 
    Details
    ISSN: 1432-0649
    Keywords: 3320K ; 4272
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The hyperfine structure of various absorption lines of molecular iodine with wavenumbers between 12980 and 13890 cm−1 has been resolved using Doppler-free polarization spectroscopy. The wavenumbers of theo-component of 17 rovibrational lines of I2 due to the transitionB 3Π ou + −X1∑ g + with even rotational quantum numbers have been determined with an accuracy of 0.001 cm−1. A comparison of the centers of gravity of these 17 lines with the values of the iodine atlas of Gerstenkorn et al. yields a difference of $$\delta \tilde v = \tilde v_{c.g} - \tilde v_{atl} = - (1.8 \pm 1.2)x 10 - 3 cm^{ - 3}$$ thus corroborating the data of the iodine atlas in the red region within limits of error.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00694680
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Some considerations of and perspectives in coastal ecology (1985)
    Springer
    Plant ecology 62 (1985), S. 533-545 
    Details
    ISSN: 1573-5052
    Keywords: Ammophila arenaria ; Ecological optimum ; Mineral allocation ; Optimal control ; Phleum arenarium ; Salicornia europaea ; Skewness ; Variability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Ecophysiological studies of plant species in wet saline habitats have been one-sided in the past, emphasizing sodium chloride only. More emphasis should be given to anaerobiosis, to mechanical factors, to the effects of a surplus of other nutrients in seawater and coastal ecosystems and their metabolic impact as well as to aspects of nutrient (re)allocation. Research should incorporate theoretical models on plant strategies maximizing yield, minimizing risk. At the population level, a new operational parameter for ecological optima and ecological stress is presented considering normal and skewed distributions of plant parameters in relation to growth and the concentration of mineral nutrients. Some considerations on the ecological effects of phenotypic plasticity and genetic variability are given by emphasizing the aspects of diaspores. Future investigations of coastal vegetation should consider the interaction of populations within plant communities, including the regulating effects of animals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00044779
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Size hierarchy and mineral status of Rhinanthus angustifolius populations under different grassland management regimes (1987)
    Springer
    Plant ecology 70 (1987), S. 93-103 
    Details
    ISSN: 1573-5052
    Keywords: Gini coefficient ; Grassland management ; Mineral allocation ; Rhinanthus angustifolius ; Size hierarchy ; Skewness ; Variability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The size hierarchy and mineral concentrations of adult plants in flower and their seed crop have been investigated in three populations of Rhinanthus angustifolius under a grassland management regime consisting of haying without fertilization. The effect of this type of management on the nutrient budgets of soil or Rhinanthus plants was shown to be small initially, i.e. up to the twelfth year of changed management. Although the mean biomass of plants significantly diminished by 30% in this period, their nutrient concentration was not strongly affected. Small plants consistently had lower concentrations of N and Na than large plants. Prolongation of this management regime beyond twelve years let to a general reduction in the phosphorus concentration of the plants. An observed increase in the concentrations of K, Mn, and Cu, especially in small plants, is tentatively ascribed to an imbalance in mineral nutrition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00041475
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Mycorrhizal infection of an Agrostis capillaris population on a copper contaminated soil (1994)
    Springer
    Plant and soil 158 (1994), S. 83-89 
    Details
    ISSN: 1573-5036
    Keywords: Agrostis capillaris ; copper tolerance ; mine soils ; vesicular-arbuscular mycorrhiza ; zinc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract To investigate the possible natural development of heavy metal tolerance in VA-mycorrhizal fungi, plants of Agrostis capillaris from an uncontaminated, a copper-contaminated and a zinc/cadmium-contaminated area were examined for VA-mycorrhizal infection. During a period of 5 years (1987 to 1991) the plants of the copper-tolerant population were hardly infected, whereas the population on the uncontaminated soil showed a mean infection of nearly 60% and the zinc/cadmium-tolerant population of 40%. A detailed analysis of the surroundings of the copper-enriched site revealed the presence of VA-mycorrhizal fungi and a negative correlation between the infection rate of A. capillaris and the copper content of the soil. In contrast to the copper-contaminated soil, the abundant presence of VA-mycorrhizal fungi in the area contaminated by zinc and cadmium indicates that these fungi have evolved a zinc and cadmium tolerance and that they may play a role in the zinc and cadmium tolerance of A. capillaris.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00007920
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Seasonality of VAM infection in three populations of Agrostis capillaris (Gramineae) on soil with or without heavy metal enrichment (1992)
    Springer
    Plant and soil 139 (1992), S. 67-73 
    Details
    ISSN: 1573-5036
    Keywords: Agrostis capillaris ; heavy metals ; macro- and micro-nutrients ; natural populations ; seasonality ; VAM-infection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Three populations of the perennial grass Agrostis capillaris, growing on limestone derived clay with and without natural enrichment of the heavy metals cadmium, lead, and zinc, and on a sandy soil polluted by a metal smelter have been investigated with regard to the percentage and seasonality of infection with vesicular-arbuscular mycorrhizal (VAM) fungi and its impact on mineral nutrition. In all populations VAM infection was lowest during winter, and highest during late summer and autumn. The population at the metal smelter site was less infected by VAM fungi than both other populations. The concentration of mineral nutrients for the three populations was clearly related to the soil concentration, but hardly modified by the degree of VAM infection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00012843
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Polarization spectroscopy of Sr79Br and Sr81Br: Analysis of theX 2 Σ + andB 2 Σ + hyperfine structure (1986)
    Springer
    The European physical journal 1 (1986), S. 103-112 
    Details
    ISSN: 1434-6079
    Keywords: 33.40.Hp ; 33.20.Kf ; 35.20.Sd
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Microwave optical polarization spectroscopy has been used to measure the hyperfine structure in theX 2 Σ + (v=0) electronic ground state of Sr79Br and Sr81Br. Optical hyperfine structure in theB 2 Σ +−X 2 Σ + (0,0) system was resolved by Doppler-free laser polarization spectroscopy. The magnetic hyperfine parametersb andc and the electricquadrupole hfs parametereqQ were determined for theX 2 Σ + andB 2 Σ + states of both molecules. The magnetic hfs has been interpreted as an effect of halide electron spin polarization. The electric quadrupole coupling constants are compared with the alkali halides and discussed in terms of Sternheimer antishielding in polar molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01384664
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    Paper (German National Licenses)
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