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  • 1985-1989  (4)
  • 1975-1979
  • 1987  (4)
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  • 1985-1989  (4)
  • 1975-1979
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  • 1
    Electronic Resource
    Electronic Resource
    Induced tolerance of neonate Heliothis zea to host plant allelochemicals and carbaryl following incubation of eggs on foliage of Lycopersicon hirsutum f. glabratum (1987)
    Springer
    Oecologia 73 (1987), S. 615-620 
    Details
    ISSN: 1432-1939
    Keywords: Heliothis zea ; Cytochrome P-450 ; Induced tolerance ; Allelochemicals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Incubation of Heliothis zea (Boddie) eggs on foliage of Lycopersicon hirsutum f. glabratum C.H. Mull (accession PI 134417) results in neonates with elevated levels of tolerance to the toxic effects of PI 134417 foliage attributable to 2-tridecanone found in the glandular trichomes which abound on that foliage. The neonates from such eggs are also shown to have elevated levels of tolerance to the carbamate insecticide carbaryl. Incubation of eggs in an atmosphere containing 2-tridecanone similarly produced elevated levels of tolerance to 2-tridecanone among resulting neonates, indicating that 2-tridecanone is the likely inducing agent and that exposure to 2-tridecanone vapor, which is known to emanate from PI 134417 foliage, is sufficient for induction. Analysis of the cytochrome P-450 content in gut microsomes of fifth instar larvae indicated that exposure of larvae to 2-tridecanone in artificial diet or to PI 134417 foliage resulted in significantly elevated levels of cytochrome P-450 relative to larvae fed diet without 2-tridecanone or foliage of L. esculentum which contains no 2-tridecanone. In addition, removal of the glandular trichomes from PI 134417 foliage eliminated the ability of that foliage to induce elevated levels of cytochrome P-450. These results provide circumstantial evidence that cytochrome P-450 may be involved in the induced tolerance to xenobiotics among neonates from eggs exposed to 2-tridecanone or PI 134417 foliage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00379425
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The lognormal distribution of trace elements in glacial till (1987)
    Springer
    Journal of radioanalytical and nuclear chemistry 109 (1987), S. 275-281 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The concentrations of Au, Ce, Cr, Eu, Hf, La, Lu, Sc, Sm, Th, U and Yb were determined by instrumental neutron activation analysis in 1200 samples of glacial till from Quebec by using a SLOWPOKE reactor. All these elements are lognormally distributed in the till which would suggest that their concentrations, while reflecting somewhat the composition of the bedrock, are apparently not regulated about a central value by any geological process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02037871
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    An activation analysis system for short-lived radioisotopes including automatic dead-time corrections with a microcomputer (1987)
    Springer
    Journal of radioanalytical and nuclear chemistry 110 (1987), S. 61-66 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A system based on an IBM-PC microcomputer coupled to a Canberra Series 80 multichannel analyser has been developed for activation analysis with short-lived radioisotopes. The data transfer program can store up to 77 gamma-ray spectra on a floppy disk. A spectrum analysis program, DVC, has been written to determine peak areas interactively, to correct the counting losses, and to calculate elemental concentrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02055010
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Determination of erbium in silicate rocks at the 1 μg/g level (1987)
    Springer
    Journal of radioanalytical and nuclear chemistry 114 (1987), S. 319-327 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A method for the determination of erbium by instrumental neutron activation analysis in rocks using 2.28 s167mEr has been developed. The technique employs pseudocyclic activation in an epithermal neutron flux and a detection limit of 0.5 μg/g was attained. Eight international rock standards were analysed to test the method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02039806
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    Paper (German National Licenses)
    Fulltext
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