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  • 1
    Electronic Resource
    Electronic Resource
    Forward-scattered optical radiation in a bipolar ionized medium (1986)
    Springer
    Russian physics journal 29 (1986), S. 152-156 
    Details
    ISSN: 1573-9228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We study the dependence of the forward-scattered radiation from a point source in wood smoke on the electrical conductivity of the medium. It is shown that as the number of airborne ions in the medium increases, the intensity of the forward-scattered radiation increases because of ionization. Intensity variations are due to the growth of particles because of coagulation, which occurs because the airborne ions are cooled on the surfaces of the scattering centers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00896356
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  • 2
    Electronic Resource
    Electronic Resource
    Composition and role of volatile substances in atmosphere surrounding two gregarious locusts,Locusta migratoria andSchistocerca gregaria (1988)
    Springer
    Journal of chemical ecology 14 (1988), S. 1023-1033 
    Details
    ISSN: 1573-1561
    Keywords: Locusts ; Orthoptera ; Locustidae ; Schistocerca gregaria ; Locusta migratoria ; pheromones ; phenol ; guaiacol ; veratrole ; aggregation ; gregarious locusts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Volatile substances in the atmosphere surrounding gregarious locustsSchistocerca gregaria andLocusta migratoria were captured and investigated by combined gas chromatography-mass spectrometry. Three aromatic derivates have been identified: phenol, guaiacol, and veratrole. Their relative percentages differ for different ages and species. Behavioral tests show that essentially phenol, guaiacol, and the mixture of the three products tend to increase the aggregation behavior in both species and thus act as “cohesion pheromones.”
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01018790
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  • 3
    Electronic Resource
    Electronic Resource
    Cuticular hydrocarbons of gregarious and solitary locustsLocusta migratoria cinerascens (1986)
    Springer
    Journal of chemical ecology 12 (1986), S. 1213-1238 
    Details
    ISSN: 1573-1561
    Keywords: Locusts ; Locusta migratoria ; cuticular hydrocarbons ; mass spectrometry ; phase polymorphism ; Orthoptera ; Acrididae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The cuticular hydrocarbons ofLocusta migratoria cinerascens—larvae and adults, males and females, gregarious and solitaries—have been investigated by combined gas chromatography-mass spectrometry. The hydrocarbons comprise 52–78% of the cuticular lipids and are divided inton-alkanes (28.7–47.3%), 3-, 4-, and 5-methylalkanes (11.3–15.8%), internally branched monomethylalkanes (13.7–19.9%), and internally branched dimethylalkanes (19.8–35.9%) with seven or nine methylenes between the two branch points. While the sexual dimorphism does not seem to be reflected in the cuticular hydrocarbon composition, clear quantitative variations favoring the longest chain alkanes have been observed between gregarious and solitary locusts, thus revealing a new phase character in these insects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01012343
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  • 4
    Electronic Resource
    Electronic Resource
    New natural aliphatic ethers in cuticular waxes of gregarious and solitary locustsLocusta migratoria cinerascens (II) (1987)
    Springer
    Journal of chemical ecology 13 (1987), S. 265-282 
    Details
    ISSN: 1573-1561
    Keywords: Locusts ; Locusta migratoria ; cuticular waxes ; aliphatic ethers ; mass spectrometry ; phase polymorphism ; Orthoptera ; Locustidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract An original homologous series of di-n-alkyl ethers has been revealed in the cuticular waxes ofLocusta migratoria cinerascens. The mass spectrometry-electron impact, and positive and negative chemical ionization of these derivatives has been investigated in order to define the optimal conditions for structural determination. The quantitative analyses have shown that the ethers C n1H2n1 + 1-O-C n2H2n2+1 with an odd number of carbon atoms (n1 even andn2 odd) are clearly predominant. Furthermore, they have made a double phasal dimorphism appear: heavier ethers in the case of the solitary insects and majority participation ofn-alkyl chains in C16 (60%) in the case of the gregarious locusts and in C18 (50%) in the solitary ones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01025887
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