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  • 1
    Electronic Resource
    Electronic Resource
    Shock wave demagnetization of BaFe12O19 hard ferrimagnetics (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 3007-3009 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A study of the effect of shock waves on the phase state of a hard ferrimagnetic material has been performed. A plane shock wave was passed along the axis of a cylindrical BaFe12O19 hard ferrite magnet. The shock wave demagnetized the cylinder, reducing the magnetic flux. This change in magnetic flux generated an electromotive force (EMF) in a coil wound around the ferrite. The value of the EMF calculated on the assumption that the ferrite was completely demagnetized by the shock wave is in good agreement with the peak EMF value obtained experimentally. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1431434
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  • 2
    Electronic Resource
    Electronic Resource
    Olfactory-induced muscle potentials inDendroctonus frontalis: Effects of trans-verbenol and verbenone (1978)
    Springer
    Cellular and molecular life sciences 34 (1978), S. 463-464 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Potentials from antennal muscle movement induced by stimulation with the pheromone frontalin were recorded simultaneously with the electroantennogram (EAG) fromDendroctonus frontalis. The beetle-produced pheromones verbenone and trans-verbenol were found to decrease the muscle potential activity elicited by frontalin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01935928
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  • 3
    Electronic Resource
    Electronic Resource
    External Ocelli in Lepidoptera Previously Considered to be Anocellate (1973)
    [s.l.] : Nature Publishing Group
    Nature 242 (1973), S. 205-206 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 a, Scanning elec-tron micrograph of Man-duca sexta (Lepidoptera: Sphingidae) head show-ing the two corneal len-ses. The posterior of the head capsule is up. Bar equals lOOji. b, Higher magnification of the cor-nea on the left side of a. c, Light micrograph of a longitudinal section through ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/242205a0
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  • 4
    Electronic Resource
    Electronic Resource
    Enhancement of insect pheromone responses by green leaf volatiles (1990)
    Springer
    Naturwissenschaften 77 (1990), S. 29-31 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01131792
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  • 5
    Electronic Resource
    Electronic Resource
    Green leaf volatiles interrupt aggregation pheromone response in bark beetles infesting southern pines (1992)
    Springer
    Cellular and molecular life sciences 48 (1992), S. 523-524 
    Details
    ISSN: 1420-9071
    Keywords: Inhibitor ; antiaggregation pheromone ; bark beetle ; green leaf volatile ; Dendroctonus frontalis ; Ips avulsus ; Ips grandicollis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Green leaf volatiles were shown to interrupt responses to aggregation pheromones of three species of bark beetles (Coleoptera: Scolytidae) which infest pines in the southern United States [the southern pine beetle,Dendroctonus frontalis Zimm.; the four-spined engraver,Ips avulsus (Eichhoff); and the five-spined engraver,Ips grandicollis (Eichhoff)]. The order of effectiveness of the compounds tested for each species was hexanal〉hexanal+hexan-1-ol〉hexan-1-ol. Neither hexanal, hexan-1-ol nor hexanal+hexan-1-ol was as effective in interrupting pheromone responses ofD. frontalis as verbenone, a known inhibitor of this species. Other than interspecific chemical signals, this is the first report of an interruptant forIps species, and the only report of a pheromone interruptant active for bothIps andDendroctonus species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01928180
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  • 6
    Electronic Resource
    Electronic Resource
    Olfactory perception of pheromone and host-odour enantiomers byIps typographus (Coleoptera : Scolytidae) (1978)
    Springer
    Entomologia experimentalis et applicata 24 (1978), S. 336-342 
    Details
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé On a enregistré des électroantennogrammes deIps typographus mâles et femelles en réaction aux énantiomères de leur phéromone,cis-verbénol, et du précurseur, α-pinène. (S)-(-)-α-pinène, précurseur de (S)-(-)-cis-verbénol, a provoqué des réactions sensiblement plus importantes que le (R)-(+)-énantiomère aussi bien chez les mâles que chez les femelles. Les mâles ont réagi davantage à (S)-(-)-α-pinène que les femelles. La réaction des femelles à (S)-(-)-cis-verbénol était sensiblement plus forte qu'au (R)-(+)-énantiomère. Ces résultats ont montré un nombre semblable d'accepteurs pour la phéromone et pour le terpène de la plante-hôte, la phéromone ayant une plus grande affinité pour ses accepteurs. Sur la base des données électro-physiologiques, on a construit des accepteurs hypothétiques.
    Notes: Abstract Electroantennograms (EAGs) were recorded from adult male and female beetles to enantiomers of their pheromone,cis-verbenol, and the precursor,α-pinene. (S)-(-)-α-pinene, the precursor for (S)-(-)-cis-verbenol, elicited significantly greater responses in both males and females than did the (R)-(+)-enantiomer. Male beetles were more responsive to the (S)-(-)-α-pinene than female beetles. The response of female beetles was significantly greater to (S)-(-)-cis-verbenol than to the (R)-(+)-enantiomer. Although EAGs indicated a similar number of acceptor sites for both the pheromone and host terpene, the pheromone had a greater affinity for its acceptor sites. Based on electro-physiological data hypothetical acceptors were constructed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02385082
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  • 7
    Electronic Resource
    Electronic Resource
    Insect predator-prey coevolution via enantiomeric specificity in a kairomone-pheromone system (1984)
    Springer
    Journal of chemical ecology 10 (1984), S. 487-492 
    Details
    ISSN: 1573-1561
    Keywords: Dendroctonusfrontalis ; Coleoptera ; Scolytidae ; Thanasimus dubius ; Cleridae ; southern pine beetle ; kairomone ; behavior ; olfaction ; coevolution ; predator ; enantiomer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Insect predators can be guided to their prey by a kairomonal response to the prey pheromone. We found this phenomenon to be highly specific in the bark beetle predatorThanasimus dubius. Olfactory responses and behavioral tests revealed that the predator is guided to its major preyDendroctonusfrontalis by the primary enantiomer of the pheromone of the prey, (1S, 5R)-(−)-frontalin. These and other findings suggest the co-evolution of a kairomone system of the predator and the pheromone system of its prey.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00988094
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  • 8
    Electronic Resource
    Electronic Resource
    Antennal olfactory responsiveness of three sympatricIps species [Ips avulsus (Eichhoff),Ips calligraphus (Germar),Ips grandicollis (Eichhoff)], to intra- and interspecific behavioral chemicals (1988)
    Springer
    Journal of chemical ecology 14 (1988), S. 1289-1304 
    Details
    ISSN: 1573-1561
    Keywords: Electroantennogram ; pheromone ; bark beetles ; Ips, Dendroctonus ; Coleoptera ; Scolytidae ; olfactory receptors ; intraspecific ; interspecific ; electrophysiology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Electroantennograms (EAGs) from male and femaleIps avulsus, I. calligraphus, andI. grandicollis to their pheromones and selected host odorants or kairomones verified the presence of antennal olfactory receptors in both sexes of each species capable of detecting ipsdienol, ipsenol,cis- andtrans-verbenol,endo-brevicomin α-pinene, frontalin, and verbenone. Each species possesses receptors with lower thresholds and in greater abundance for the compounds they produce and to which they are behaviorally most responsive. Detection of bothIps andDendroctonus pheromones by the three cohabiting species provides a sensory basis for olfactory interactions among the species. Differences in both threshold and saturation levels for EAGs for the various behavioral chemicals could denote differences in specific behavioral roles for each compound.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01019353
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  • 9
    Electronic Resource
    Electronic Resource
    Antennal olfactory responsiveness of Douglas-fir beetle,Dendroctonus pseudotsugae Hopkins (Coleoptera: Scolytidae) to pheromones and host odors (1983)
    Springer
    Journal of chemical ecology 9 (1983), S. 1383-1395 
    Details
    ISSN: 1573-1561
    Keywords: Douglas-fir beetle ; Dendroctonus pseudotsugae ; Coleoptera ; Scolytidae ; electroantennograms ; host selection ; attractants ; aggregation ; 3-methylcyclohex-2-en-1-one ; 3-methylcyclohex-2-en-1-ol ; frontalin ; trans-verbenol ; verbenone ; limonene ; camphene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Electroantennograms were obtained fromD. pseudotsugae in response to the pheromones 3-methylcyclohex-2-en-1-one (3,2-MCHone), 3-methylcyclohex-2-en-1-ol (3,2-MCHol), frontalin,trans-verbenol, verbenone, and the host terpene hydrocarbons limonene and camphene. Male and female beetles were 10 and 100 times more sensitive to 3,2-MCH-one and 3,2-MCHol than to the other compounds. Of the other compounds, males were most sensitive totrans-verbenol, verbenone, and camphene, while females were most sensitive to frontalin, limonene, and camphene. The results parallel and help explain behavior of individual males and females during host tree selection, aggregation, and colonization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00990745
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  • 10
    Electronic Resource
    Electronic Resource
    Southern pine beetle: Olfactory receptor and behavior discrimination of enantiomers of the attractant pheromone frontalin (1982)
    Springer
    Journal of chemical ecology 8 (1982), S. 873-881 
    Details
    ISSN: 1573-1561
    Keywords: Enantiomers ; bark beetle ; pheromone ; Dendroctonus frontalis ; Coleoptera ; Scolytidae ; southern pine beetle ; electrophysiology ; olfaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract In laboratory and field bioassays, the response ofDendroctonus frontalis was significantly greater to the mixture of (1S, 5R)-(−)-frontalin andalpha-pinene than to (1R,5S)-(+)-frontalin andalpfa-pinene. Electro-physiological studies revealed that antennal olfactory receptor cells were significantly more responsive to (1S, 5R)-(−)-frontalin than to (1R, 5S)-(+)-frontalin. Both enantiomers stimulated the same olfactory cells which suggests that each cell possesses at least two types of enantiomer-specific acceptors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00994788
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