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  • Aldehydes  (2)
  • Lepidoptera  (2)
  • 57 M 99  (1)
  • Hemiptera
  • 1990-1994  (4)
  • 1
    Electronic Resource
    Electronic Resource
    The asymptotic behaviour of the number of three-connected triangulations of the disk, with a reflective symmetry in a line (1992)
    Springer
    Combinatorica 12 (1992), S. 149-153 
    Details
    ISSN: 1439-6912
    Keywords: 05 C 30 ; 05 A 15 ; 05 C 10 ; 57 M 99
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We consider the enumeration of the three-connected triangulations of the disk, with a reflective symmetry about a line. The asymptotic behavior is unlike that observed for rooted maps or for maps having rotational symmetry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01204718
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of some leaf-emitted volatile compounds on aphid population increase (1993)
    Springer
    Journal of chemical ecology 19 (1993), S. 1875-1887 
    Details
    ISSN: 1573-1561
    Keywords: Aldehydes ; alcohols ; fatty acids ; lipids ; lipoxygenase ; pest defense
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract A role of some volatile compounds produced by plant tissues may be as defensive molecules against various pests, including arthropods. Volatile six-carbon compounds derived in plant tissue from polyunsaturated fatty acids via lipoxygenase/hydroperoxide lyase reduced tobacco aphid fecundity at certain concentrations when added to headspace vapor to which aphids were exposed. Both C6 aldehydes and alcohols were effective, with the alcohols having greater activity. (Z)-3-Hexenyl acetate at levels in the headspace similar to those of the alcohols and aldehydes did not reduce aphid fecundity. A 6-hr exposure period to the C6 aldehydes and alcohols was needed for maximum effect on the aphids feeding on tobacco leaves. Analysis of the direct versus indirect effects of these compounds indicates that the volatile aldehydes had both direct effects on aphid fecundity and indirect effects due to induced changes in the leaves upon which the aphids were feeding, while only indirect effects were observed for the alcohols. Tomato leaves have the capacity to produce volatile compounds at levels that impact aphid population increase, with the volatiles produced from crushed leaves having a much larger effect. The C6 aldehydes and alcohols may be components of the fecundity reduction seen with tomato volatiles; however, volatile terpenes showed no effect. These results can be of significance for the genetic alteration of plants for improved aphid resistance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00983793
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  • 3
    Electronic Resource
    Electronic Resource
    Field tests of syntheticManduca sexta sex pheromone (1994)
    Springer
    Journal of chemical ecology 20 (1994), S. 579-591 
    Details
    ISSN: 1573-1561
    Keywords: Aldehydes ; formulation ; 10,12-hexadecadienal ; 10,12,14-hexadecatrienal ; moth ; Manduca sexta ; Lepidoptera ; Sphingidae ; tobacco hornworm ; trapping
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract In field experiments traps were baited with live females or with a two-, four-, or eight-component blend of the 16-carbon aldehydes previously identified as components of the sex pheromone emitted by femaleManduca sexta moths. The blends were formulated on rubber septa. Traps baited with a blend of all eight aldehydes captured moreM. sexta males than any other treatment. Septa loaded with 600 μg of the eight-component blend were attractive to males for about seven days in the field. Septa loaded with the eight-component blend and stored in a refrigerator at 4°C for a year released the conjugated diene and triene aldehydes at the same rate as freshly prepared septa and were equally attractive in the field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02059599
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  • 4
    Electronic Resource
    Electronic Resource
    Ovipositional response of tobacco budworm moths (Lepidoptera: Noctuidae) to cuticular labdanes and sucrose esters from the green leaves ofNicotiana glutinosa L. (Solanaceae) (1991)
    Springer
    Journal of chemical ecology 17 (1991), S. 2489-2506 
    Details
    ISSN: 1573-1561
    Keywords: Insecta ; Lepidoptera ; Noctuidae ; Heliothis virescens ; tobacco budworm ; Nicotiana ; ovipositional stimulants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Field plots of three accessions ofNicotiana glutinosa L. (Nicotiana species accessions 24, 24A, and 24B) at Oxford, North Carolina and Tifton, Georgia were heavily damaged by natural populations of tobacco budworms,Heliothis virescens (F.), during 1985–1989. Experiments in outdoor screen cages demonstrated that all accessions ofN. glutinosa were as prone to oviposition byH. virescens moths as was NC 2326, a commercial cultivar of flue-cured tobacco,N. tabacum L. However, in greenhouse experiments, tobacco budworm larvae did not survive or grow as well when placed on plants ofN. glutinosa as they did when placed on plants of NC 2326. Four labdane diterpenes (manool, 2-hydroxymanool, a mixture of sclareols, and labda-13-ene-8α,15-diol [labdenediol]) and two sucrose ester fractions (2,3,4-tri-O-acyl-3′-O-acetyl-sucrose [G-SE-I] and 2,3,4,-tri-O-acyl-sucrose [G-SE-II]) were isolated from green leaves of the three accessions ofN. glutinosa. These components were bioassayed for their effects on the ovipositional behavior of tobacco budworm moths using small screen cages in a greenhouse at Oxford, North Carolina. Labdenediol, manool, and both sucrose ester fractions stimulated tobacco budworm moths to oviposit on a tobacco budworm-resistant Tobacco Introduction, TI 1112 (PI 124166), when these materials were sprayed onto a leaf.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00994597
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