GLORIA

GEOMAR Library Ocean Research Information Access

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Host-location kairomone fromPeriplaneta americana (L.) for parasitoidAprostocetus hagenowii (Ratzeburg) (1996)
    Springer
    Journal of chemical ecology 22 (1996), S. 637-651 
    Details
    ISSN: 1573-1561
    Keywords: Biological control ; cuticular hydrocarbon ; attractant ; ootheca ; 6,9-heptacosadiene ; Blattidae ; frass ; Insecta ; Periplaneta americana ; Aprostocetus hagenowii ; kairomone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Chemically mediated host location in the eulophid parasitoidAprostocetus hagenowii (Ratzeburg) was investigated. In Y-tube bioassays 77.6% of female parasitoids responded to aPeriplaneta americana (L.) ootheca; parasitoids did not respond to air with no volatile stimuli. Frass from adult cockroaches was as attractive as an ootheca. Bioassay of one ootheca equivalent of five lipid fractions (eluted with hexane and 1, 5, 10, and 30% ether in hexane) from silica gel column chromatography indicated that the active component was a hydrocarbon. Further separation and bioassay of oothecal hydrocarbons by AgNO3-impregnated silica gel column chromatography indicated that the biological activity was in one fraction. Gas chromatographic (GC) analysis of this fraction revealed a single peak; this peak was identified by researchers in 1963, 1969, and 1972 as (Z,Z)-6,9-heptacosadiene. Qualitative and quantitative GC analyses of total hydrocarbons from oothecae, frass, and adult females were essentially identical; 6,9-heptacosadiene was the dominant hydrocarbon from each source. The alkadiene was 37 times more abundant in frass than on the ootheca. The volatilization of the alkadiene from oothecae was demonstrated by aeration and trapping on Super Q adsorbent. The current study is the first evidence for biological activity of (Z,Z)-6,9-heptacosadiene, a major hydrocarbon component on adult female American cockroaches, on their oothecae, and in their frass.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02033575
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Cuticular Hydrocarbons of Glossina, III: Subgenera Glossina and Nemorhina (1997)
    Springer
    Journal of chemical ecology 23 (1997), S. 1291-1320 
    Details
    ISSN: 1573-1561
    Keywords: Tsetse fly ; sex pheromone ; gas–liquid chromatography ; mass spectrometry ; methylalkanes ; patterns ; Diptera ; hydrocarbons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The cuticular methyL-branched alkanes of tsetse flies of the subgenera Glossina (sensu stricto, formerly morsitans) and Nemorhina (formerly palpalis) were identified and quantified by capillary gas–liquid chromatography (GC) and gas chromatography–mass spectrometry (GC-MS). Males of Glossina (Nemorhina) are differentiated from G. (Glossina) by dominant 27-, 28-, and/or 29-carbon backbone trimethylalkanes with the methyl positions at 3,7,11-, 4,8,12-, and 3,7,11-, respectively. All females contain major quantities of long-chain internally branched di- and/or trimethylalkanes that were previously implicated as mediators of sexual behavior in males. Taxa within these two subgroups that are closely related and/or conspecific, based upon conventional morphological and ecological criteria, exhibit similar GC patterns and similar internally branched di- and trimethylalkane isomers in females. Examination of these potentially stimulatory methylalkanes may provide reasons for the reproductive isolation of closely related species from each other.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/B:JOEC.0000006465.90735.a0
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Elution Patterns from Capillary GC for Methyl-Branched Alkanes (1998)
    Springer
    Journal of chemical ecology 24 (1998), S. 1845-1865 
    Details
    ISSN: 1573-1561
    Keywords: Hydrocarbons ; alkanes ; methyl-branched hydrocarbons ; cuticular hydrocarbons ; insects ; GC-MS data ; retention indices
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract A common and confusing problem in analyses of insect hydrocarbons is in making sense of complicated gas chromatograms and interpreting mass spectra since branched chain compounds differing by one or two carbons in backbone or chain length may elute from the column at nearly the same time. To address this confusing situation, relative gas chromatography (GC) retention times are presented for typical mono-, di-, tri-, and tetramethylalkanes comprising most of the commonly appearing series of homologous methyl-branched alkanes up to 53 carbons that are found in insect cuticular hydrocarbons. Typical insect-derived methylalkanes with backbones of 33 carbons were characterized by Kovats indices (KI); monomethyl alkanes elute between KI 3328 and 3374, dimethylalkanes elute between KI 3340 and 3410, trimethylalkanes elute between KI 3378 and 3437, and tetramethylalkanes elute between KI 3409 and 3459, depending upon the positions of substituents. A protocol is described for identification of methyl-branched hydrocarbons eluted from nonpolar polysiloxane DB-1 capillary GC columns. In this protocol, retention indices (KI values) are assigned to peaks, then the patterns in GC peaks that probably contain homologs are marked to assist subsequent GC-mass spectrometric (GC-MS) interpretation. Use of the KI allows assignment of likely structures and the elimination of others, with demonstrative consistency, as there are no known exceptions. Interpretation of electron ionization mass spectra can then proceed within narrowed structural possibilities without the necessity of chemical ionization GC-MS analysis. Also included are specific examples of insect hydrocarbons that were assembled from 30 years of the literature, and these are intended to help with confirmation of confusing or contradictory structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022311701355
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...