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  • 1
    Electronic Resource
    Electronic Resource
    Coevolution: Mathematical analysis of host-parasite interactions (1984)
    Springer
    Journal of mathematical biology 19 (1984), S. 63-77 
    Details
    ISSN: 1432-1416
    Keywords: Slow coevolution ; singular perturbations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract An S→I→S epidemic transmitted by two similar strains of parasite acting on a host population of three genotypes which differ in their reaction to the disease is modelled and analyzed. Singular perturbation techniques are used to reduce the original system of nine differential equations to a coupled system of two equations describing the slowtime coevolution of gene frequency and parasite strain frequency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00275931
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    The effect of epidemics on genetic evolution (1984)
    Springer
    Journal of mathematical biology 19 (1984), S. 79-94 
    Details
    ISSN: 1432-1416
    Keywords: Epidemics ; slow-genetic evolution ; singular perturbations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Mathematical models of a vector-borne infectious disease acting on a host population consisting of three genotypes which differ in susceptibility to, recovery from, and death due to the disease are presented and analyzed. Singular perturbation techniques are used to obtain a single differential equation describing the slow time evolution of gene frequencies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00275932
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    Paper (German National Licenses)
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  • 3
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    Measurements of free tropospheric ozone - An aircraft survey from 44 degrees north to 46 south latitude (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Ozone data were obtained in the free troposphere at altitudes of 5 to 7.5 km and at latitudes from 44 degrees N to 46 degrees S during a 3-week period from October 19 to November 4, 1982. Flight trajectories included the continental U.S., Central America, and the western coast of South America. Maximum observed ozone was 110 ppb at about 41 degrees S latitude and at an altitude of 7.3 km (msl). Analysis of the data as a function of latitude showed a region of elevated ozone in the southern latitudes extending from about 2 degrees to 30 degrees in which latitudinal ozone averages (2 degree bands) peaked at about 80 ppb. Ozone concentrations, measured at northern latitudes, were lower, averaging about 35 ppb. A discussion of the data, including comparison with other ozone data sets, is presented.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 89; 9642-964
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Observations of atmospheric ozone - 38 to 76 deg north latitude at altitudes from 8 km to the surface (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Ozone data were obtained from 8 km to the surface and at latitudes from 38 to 76 deg N during January and February 1983. Flight lines covered northeastern U.S., Canada, and Greenland. The results of the latitudinal survey at 5- to 8-km altitude showed O3 mixing ratios to be about 40 ppbv with little variation in latitude. One region of elevated O3 was observed and extended from 54 N to 57 deg N latitude. Ozone reached 150 ppbv at 6.4-km altitude. This sampling was stratospheric air as the tropopause height was 5.6-km altitude. Profiles at 76, 67, and 53 deg N showed O3 to be be well mixed from about 5 km to the surface. In some cases, profiles identified a layer of 1 km to 100 m vertical dimension at the surface, in which O3 destruction had occurred.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 11; 1129-113
    Format: text
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    NASA TECHNICAL REPORTS
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