Crematogaster

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Désiré E. Daloze - One of the best experts on this subject based on the ideXlab platform.

  • new 1 alk en yl 1 3 5 trihydroxycyclohexanes from the dufour gland of the african ant Crematogaster nigriceps
    Tetrahedron Letters, 2003
    Co-Authors: Pascal Laurent, Anissa Hamdani, Désiré E. Daloze, Jean Christophe De Biseau, Jean Claude Braekman, Lynne A. Isbell, Jacques Pasteels
    Abstract:

    The Dufour gland of the African ant Crematogaster nigriceps contains a mixture of at least eight 1-heptadec(en)yl- and 1-nonadec(en)yl-1,3,5-trihydroxycyclohexane derivatives, the mono-unsaturated components being the major ones (about 65%). They are accompanied by small amounts of (Z,Z)-dienic derivatives (<10%). The structures, the relative and absolute configurations, and the preferred conformation of these new compounds have been established by spectroscopic and chemical methods, whereas the positions of the double bond in the alkenyl chains were determined by DMDS derivatisation followed by linked scan EIMS.

  • New 1-alk(en)yl-1,3,5-trihydroxycyclohexanes from the Dufour gland of the African ant Crematogaster nigriceps
    Tetrahedron Letters, 2003
    Co-Authors: Pascal Laurent, Anissa Hamdani, Désiré E. Daloze, Jean Christophe De Biseau, Jean Claude Braekman, Lynne A. Isbell, Jacques M. Pasteels
    Abstract:

    The Dufour gland of the African ant Crematogaster nigriceps contains a mixture of at least eight 1-heptadec(en)yl- and 1-nonadec(en)yl-1,3,5-trihydroxycyclohexane derivatives, the mono-unsaturated components being the major ones (about 65%). They are accompanied by small amounts of (Z,Z)-dienic derivatives (

  • furanocembranoid diterpenes as defensive compounds in the dufour gland of the ant Crematogaster brevispinosa rochai
    Tetrahedron, 2000
    Co-Authors: Sabine Leclercq, Désiré E. Daloze, Jean Christophe De Biseau, Jean Claude Braekman, Yves Quinet, Michel Luhmer, Anders Sundin, Jacques Pasteels
    Abstract:

    Abstract Two new furanocembranoid diterpenes, crematofuran [(1R∗,11R∗,12R∗)-6,19:11,12-bisepoxycembra-3,6,8(19),15-tetraene] (1) and isocrematofuran [(1R∗,3S∗,4S∗)-3,4:6,19-bisepoxycembra-6,8(19),11,15-tetraene] (2), have been isolated from the Dufour gland secretion of the Brazilian ant Crematogaster brevispinosa rochai. Their structures, including the relative configuration, have been determined by a combination of NMR and molecular mechanics methods. The toxicity of 1 towards other ants is on the same level as that of nicotine. This is the first report of cembranoid diterpenes as defensive compounds in an ant.

  • Five new furanocembrenoids from the venom of the ant Crematogaster brevispinosa ampla from Brazil
    Tetrahedron Letters, 2000
    Co-Authors: Sabine Leclercq, Désiré E. Daloze, Jean Christophe De Biseau, Jean Claude Braekman, Yves Quinet, Jacques M. Pasteels
    Abstract:

    Abstract Five new furanocembrenoids (3–7) were isolated from the Dufour gland secretion of the Brazilian ant Crematogaster brevispinosa ampla. The structure of the major component was established by a detailed high-field 1D and 2D NMR study as the dibutanoate 3. Compounds 4 and 5 were shown to be the two isomeric monoacetate monobutanoates corresponding to 3, whereas 6 and 7 are the two isomeric monohydroxy monobutanoates.

  • 13e 15e 18z 20z 1 hydroxypentacosa 13 15 18 20 tetraen 11 yn 4 one 1 acetate from the venom of a brazilian Crematogaster ant
    Tetrahedron Letters, 1998
    Co-Authors: Désiré E. Daloze, Jean Christophe De Biseau, Jean Claude Braekman, Yves Quinet, Sabine Leclercq, Jacques Pasteels
    Abstract:

    Abstract (13 E ,15 E ,18 Z ,20 Z )-1-hydroxypentacosa-13,15,18,20-tetraen-11-yn-4-one 1-acetate, a new polyfunctionalized long chain derivative, was isolated from the venom of an as yet undetermined Crematogaster ant species from Brazil, and its structure established by a detailed high-field 1D and 2D NMR study.

Jean Christophe De Biseau - One of the best experts on this subject based on the ideXlab platform.

  • Frequency distribution of fresh body weight in Crematogaster pygmaea queens (n = 279) from two colonies (Col-4, Col-5).
    2017
    Co-Authors: Rachid Hamidi, Jean Christophe De Biseau, Glauco Bezerra Martins Segundo, Thomas Bourguignon, Matheus Torres Marinho Bezerril Fontenelle, Yves Quinet
    Abstract:

    Frequency distribution of fresh body weight in Crematogaster pygmaea queens (n = 279) from two colonies (Col-4, Col-5).

  • Antibacterial properties of contact defensive secretions in neotropical Crematogaster ants
    Journal of Venomous Animals and Toxins including Tropical Diseases, 2012
    Co-Authors: Yves Quinet, Jean Christophe De Biseau, Rhsf Vieira, Sousa, Norma Suely Evangelista-barreto, Fct Carvalho, M.i.f. Guedes, Carlucio Roberto Alves, Ana Heredia
    Abstract:

    Crematogaster ants use their contact venoms to compete with other ants. Although those venoms are used primarily as repellent and toxic secretions, they may have other functions. The present study aimed to test the antibacterial property of abdominal venom of three neotropical Crematogaster ant species (C. distans, C. pygmaea and C. rochai) against gram-negative (Escherichia coli and Pseudomonas aeruginosa) and gram-positive (Enterococcus faecalis and Staphylococcus aureus) bacteria. Sterile filter paper was soaked with C. distans, C. pygmaea or C. rochai crude venom and placed on an agar dish that was inoculated with bacterial suspensions. The agar dish was incubated overnight at 37ºC and examined for zones of growth inhibition. For each tested venom and bacterial strain, three venom concentrations were used, with six replicates for each concentration: 1, 2 and 4 DGE (Dufour's gland equivalent). The venom of C. pygmaea, but not those of C. rochai and C. distans, inhibited the growth of all tested gram-positive and gram-negative bacterial strains. This is the first evidence of antibacterial properties of contact venoms in Crematogaster ants and it supports the claim that ant venoms are multifunctional. It is hypothesized that only C. pygmaea venom showed antibacterial activities due to its nesting habits

  • Crematogaster pygmaea hymenoptera formicidae myrmicinae a highly polygynous and polydomous Crematogaster from northeastern brazil
    Zootaxa, 2009
    Co-Authors: Yves Quinet, Jean Christophe De Biseau, Rachid Hamidi, Mario X Ruizgonzalez, John T Longino
    Abstract:

    Crematogaster pygmaea is revived from synonymy under C. abstinens and newly characterized as a ground-nesting ant from northeastern Brazil. It is a habitat specialist in coastal and tabuleiro zones, where it forms extensive polydomous and polygynous colonies that nest in the soil. Workers forage extensively on honeydew and extrafloral nectar, and foraging continues day and night, although it is depressed at ground temperatures above 32°C. Gyne production occurs at the beginning of the rainy season, while male production starts in the dry season, some months before gyne production.

  • Toxicity of the venom in three neotropical Crematogaster ants (Formicidae: Myrmicinae)
    Chemoecology, 2005
    Co-Authors: Ana Heredia, Jean Christophe De Biseau, Yves Quinet
    Abstract:

    Bioassays were performed to investigate and compare the toxic properties of the contact venoms of three Neotropical Crematogaster species (C. sp. prox. abstinens, C. distans and C. brevispinosa rochai), whose main venom compounds are chemically different (long chain derivatives linked to an aldehyde or a primary acetate, and furanocembrenoid diterpenes, respectively). Different quantities of venom were topically applied on the bodies of three target insect species (workers of the termite Nasutitermes ephratae, workers of the ant Solenopsis sp., “media” and “major” workers of the ant Cephalotes pusillus). The toxicity of the venom greatly varied according to the Crematogaster species, the venom of C. b. rochai showing the highest toxic activity towards all target species. The sensitivity of the target species also greatly varied, the workers of N. ephratae showing a great sensitivity to the venoms, while the heavily armoured workers of the ant C. pusillus, particularly “major” ones, were resistant. Cuticle thickness was found to be a key factor in the resistance to the toxic effects of Crematogaster venom. Sensitivity of the target workers was also directly related to the amount of venom applied to their cuticle. Workers of C. distans were resistant to topical application of their own venom, while C. sp. prox. abstinens and C. b. rochai were not. In all cases, the venoms were slow acting, as several hours to one or even several days were needed to obtain a significant mortality. The main biological activities of the Crematogaster venom could be related to more immediate repellent properties, as recently shown with the European species C. scutellaris.

  • new 1 alk en yl 1 3 5 trihydroxycyclohexanes from the dufour gland of the african ant Crematogaster nigriceps
    Tetrahedron Letters, 2003
    Co-Authors: Pascal Laurent, Anissa Hamdani, Désiré E. Daloze, Jean Christophe De Biseau, Jean Claude Braekman, Lynne A. Isbell, Jacques Pasteels
    Abstract:

    The Dufour gland of the African ant Crematogaster nigriceps contains a mixture of at least eight 1-heptadec(en)yl- and 1-nonadec(en)yl-1,3,5-trihydroxycyclohexane derivatives, the mono-unsaturated components being the major ones (about 65%). They are accompanied by small amounts of (Z,Z)-dienic derivatives (<10%). The structures, the relative and absolute configurations, and the preferred conformation of these new compounds have been established by spectroscopic and chemical methods, whereas the positions of the double bond in the alkenyl chains were determined by DMDS derivatisation followed by linked scan EIMS.

Jacques M. Pasteels - One of the best experts on this subject based on the ideXlab platform.

  • New 1-alk(en)yl-1,3,5-trihydroxycyclohexanes from the Dufour gland of the African ant Crematogaster nigriceps
    Tetrahedron Letters, 2003
    Co-Authors: Pascal Laurent, Anissa Hamdani, Désiré E. Daloze, Jean Christophe De Biseau, Jean Claude Braekman, Lynne A. Isbell, Jacques M. Pasteels
    Abstract:

    The Dufour gland of the African ant Crematogaster nigriceps contains a mixture of at least eight 1-heptadec(en)yl- and 1-nonadec(en)yl-1,3,5-trihydroxycyclohexane derivatives, the mono-unsaturated components being the major ones (about 65%). They are accompanied by small amounts of (Z,Z)-dienic derivatives (

  • Five new furanocembrenoids from the venom of the ant Crematogaster brevispinosa ampla from Brazil
    Tetrahedron Letters, 2000
    Co-Authors: Sabine Leclercq, Désiré E. Daloze, Jean Christophe De Biseau, Jean Claude Braekman, Yves Quinet, Jacques M. Pasteels
    Abstract:

    Abstract Five new furanocembrenoids (3–7) were isolated from the Dufour gland secretion of the Brazilian ant Crematogaster brevispinosa ampla. The structure of the major component was established by a detailed high-field 1D and 2D NMR study as the dibutanoate 3. Compounds 4 and 5 were shown to be the two isomeric monoacetate monobutanoates corresponding to 3, whereas 6 and 7 are the two isomeric monohydroxy monobutanoates.

  • (13E,15E,18Z,20Z)-1-Hydroxypentacosa-13,15,18,20-tetraen-11-yn-4-one 1-acetate, from the venom of a Brazilian Crematogaster ant
    Tetrahedron Letters, 1998
    Co-Authors: Désiré E. Daloze, Jean Christophe De Biseau, Jean Claude Braekman, Yves Quinet, Sabine Leclercq, Jacques M. Pasteels
    Abstract:

    (13E,15E,18Z,20Z)-1-hydroxypentacosa-13,15,18,20-tetraen-11-yn-4-one 1- acetate, a new polyfunctionalized long chain derivative, was isolated from the venom of an as yet undetermined Crematogaster ant species from Brazil, and its structure established by a detailed high-field 1D and 2D NMR study.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

  • Venom constituents of three species of Crematogaster ants from Papua New Guinea.
    Journal of Natural Products, 1997
    Co-Authors: Sabine Leclercq, Désiré E. Daloze, Jean Christophe De Biseau, Jean Claude Braekman, M. Kaisin, C. Detrain, Jacques M. Pasteels
    Abstract:

    Fourteen new long-chain derivatives (1j-11, 2j-21, 4a-4f, 6, and 7) have been isolated, together with the known 4-oxo-2,5-dienyl acetates 1g-1i and 4-oxo-2,5-dienals 2g-2i, from the defensive secretions of three species of Crematogaster ants from Papua-New Guinea. Their structures have been established by HREIMS and 1 H-NMR studies, and by MS-MS analyses of the dimethyl disulfide derivatives 3a-3f, 5a-5f, and 8a-8f. These results, together with those already reported on the three European Crematogaster species, suggest that the production of long-chain electrophilic contact poisons is a characteristic feature of this ant genus.

Jean Claude Braekman - One of the best experts on this subject based on the ideXlab platform.

  • new 1 alk en yl 1 3 5 trihydroxycyclohexanes from the dufour gland of the african ant Crematogaster nigriceps
    Tetrahedron Letters, 2003
    Co-Authors: Pascal Laurent, Anissa Hamdani, Désiré E. Daloze, Jean Christophe De Biseau, Jean Claude Braekman, Lynne A. Isbell, Jacques Pasteels
    Abstract:

    The Dufour gland of the African ant Crematogaster nigriceps contains a mixture of at least eight 1-heptadec(en)yl- and 1-nonadec(en)yl-1,3,5-trihydroxycyclohexane derivatives, the mono-unsaturated components being the major ones (about 65%). They are accompanied by small amounts of (Z,Z)-dienic derivatives (<10%). The structures, the relative and absolute configurations, and the preferred conformation of these new compounds have been established by spectroscopic and chemical methods, whereas the positions of the double bond in the alkenyl chains were determined by DMDS derivatisation followed by linked scan EIMS.

  • New 1-alk(en)yl-1,3,5-trihydroxycyclohexanes from the Dufour gland of the African ant Crematogaster nigriceps
    Tetrahedron Letters, 2003
    Co-Authors: Pascal Laurent, Anissa Hamdani, Désiré E. Daloze, Jean Christophe De Biseau, Jean Claude Braekman, Lynne A. Isbell, Jacques M. Pasteels
    Abstract:

    The Dufour gland of the African ant Crematogaster nigriceps contains a mixture of at least eight 1-heptadec(en)yl- and 1-nonadec(en)yl-1,3,5-trihydroxycyclohexane derivatives, the mono-unsaturated components being the major ones (about 65%). They are accompanied by small amounts of (Z,Z)-dienic derivatives (

  • furanocembranoid diterpenes as defensive compounds in the dufour gland of the ant Crematogaster brevispinosa rochai
    Tetrahedron, 2000
    Co-Authors: Sabine Leclercq, Désiré E. Daloze, Jean Christophe De Biseau, Jean Claude Braekman, Yves Quinet, Michel Luhmer, Anders Sundin, Jacques Pasteels
    Abstract:

    Abstract Two new furanocembranoid diterpenes, crematofuran [(1R∗,11R∗,12R∗)-6,19:11,12-bisepoxycembra-3,6,8(19),15-tetraene] (1) and isocrematofuran [(1R∗,3S∗,4S∗)-3,4:6,19-bisepoxycembra-6,8(19),11,15-tetraene] (2), have been isolated from the Dufour gland secretion of the Brazilian ant Crematogaster brevispinosa rochai. Their structures, including the relative configuration, have been determined by a combination of NMR and molecular mechanics methods. The toxicity of 1 towards other ants is on the same level as that of nicotine. This is the first report of cembranoid diterpenes as defensive compounds in an ant.

  • Five new furanocembrenoids from the venom of the ant Crematogaster brevispinosa ampla from Brazil
    Tetrahedron Letters, 2000
    Co-Authors: Sabine Leclercq, Désiré E. Daloze, Jean Christophe De Biseau, Jean Claude Braekman, Yves Quinet, Jacques M. Pasteels
    Abstract:

    Abstract Five new furanocembrenoids (3–7) were isolated from the Dufour gland secretion of the Brazilian ant Crematogaster brevispinosa ampla. The structure of the major component was established by a detailed high-field 1D and 2D NMR study as the dibutanoate 3. Compounds 4 and 5 were shown to be the two isomeric monoacetate monobutanoates corresponding to 3, whereas 6 and 7 are the two isomeric monohydroxy monobutanoates.

  • 13e 15e 18z 20z 1 hydroxypentacosa 13 15 18 20 tetraen 11 yn 4 one 1 acetate from the venom of a brazilian Crematogaster ant
    Tetrahedron Letters, 1998
    Co-Authors: Désiré E. Daloze, Jean Christophe De Biseau, Jean Claude Braekman, Yves Quinet, Sabine Leclercq, Jacques Pasteels
    Abstract:

    Abstract (13 E ,15 E ,18 Z ,20 Z )-1-hydroxypentacosa-13,15,18,20-tetraen-11-yn-4-one 1-acetate, a new polyfunctionalized long chain derivative, was isolated from the venom of an as yet undetermined Crematogaster ant species from Brazil, and its structure established by a detailed high-field 1D and 2D NMR study.

Jacques Pasteels - One of the best experts on this subject based on the ideXlab platform.

  • new 1 alk en yl 1 3 5 trihydroxycyclohexanes from the dufour gland of the african ant Crematogaster nigriceps
    Tetrahedron Letters, 2003
    Co-Authors: Pascal Laurent, Anissa Hamdani, Désiré E. Daloze, Jean Christophe De Biseau, Jean Claude Braekman, Lynne A. Isbell, Jacques Pasteels
    Abstract:

    The Dufour gland of the African ant Crematogaster nigriceps contains a mixture of at least eight 1-heptadec(en)yl- and 1-nonadec(en)yl-1,3,5-trihydroxycyclohexane derivatives, the mono-unsaturated components being the major ones (about 65%). They are accompanied by small amounts of (Z,Z)-dienic derivatives (<10%). The structures, the relative and absolute configurations, and the preferred conformation of these new compounds have been established by spectroscopic and chemical methods, whereas the positions of the double bond in the alkenyl chains were determined by DMDS derivatisation followed by linked scan EIMS.

  • furanocembranoid diterpenes as defensive compounds in the dufour gland of the ant Crematogaster brevispinosa rochai
    Tetrahedron, 2000
    Co-Authors: Sabine Leclercq, Désiré E. Daloze, Jean Christophe De Biseau, Jean Claude Braekman, Yves Quinet, Michel Luhmer, Anders Sundin, Jacques Pasteels
    Abstract:

    Abstract Two new furanocembranoid diterpenes, crematofuran [(1R∗,11R∗,12R∗)-6,19:11,12-bisepoxycembra-3,6,8(19),15-tetraene] (1) and isocrematofuran [(1R∗,3S∗,4S∗)-3,4:6,19-bisepoxycembra-6,8(19),11,15-tetraene] (2), have been isolated from the Dufour gland secretion of the Brazilian ant Crematogaster brevispinosa rochai. Their structures, including the relative configuration, have been determined by a combination of NMR and molecular mechanics methods. The toxicity of 1 towards other ants is on the same level as that of nicotine. This is the first report of cembranoid diterpenes as defensive compounds in an ant.

  • Community interactions between ants and arboreal-nesting termites in New Guinea coconut plantations
    Insectes Sociaux, 1999
    Co-Authors: Maurice Leponce, Yves Roisin, Jacques Pasteels
    Abstract:

    We investigated the incidence of inquiline ants and of arboreal-nesting ants on a community of three arboreal-nesting termites living in New Guinea coconut plantations. Inquiline ants were present in 10 % of Microcerotermes biroi nests and in 4 % of Nasutitermes princeps nests. Live termite nests inhabited by the most common inquiline ant, Camponotus sp. A, were generally left by the ant after several months. In some nests, Camponotus sp. A was observed coexisting with its host during the whole observation period (3 years). Therefore, Camponotus sp. A was apparently an opportunistic inquiline which did not affect significantly the mortality of termite colonies. The arboreal-nesting ant, Crematogaster irritabilis, was locally found occupying up to 99 % of the trees present in 1 ha plots. In such hot spots, the overall abundance of termites was approximately half that of plots devoid of Crematogaster irritabilis. The high density of Crematogaster irritabilis may be an important limiting factor for the termite assemblage, by hastening the death or hindering the establishment of arboreal termite colonies.

  • 13e 15e 18z 20z 1 hydroxypentacosa 13 15 18 20 tetraen 11 yn 4 one 1 acetate from the venom of a brazilian Crematogaster ant
    Tetrahedron Letters, 1998
    Co-Authors: Désiré E. Daloze, Jean Christophe De Biseau, Jean Claude Braekman, Yves Quinet, Sabine Leclercq, Jacques Pasteels
    Abstract:

    Abstract (13 E ,15 E ,18 Z ,20 Z )-1-hydroxypentacosa-13,15,18,20-tetraen-11-yn-4-one 1-acetate, a new polyfunctionalized long chain derivative, was isolated from the venom of an as yet undetermined Crematogaster ant species from Brazil, and its structure established by a detailed high-field 1D and 2D NMR study.

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