Search Results - (Author, Cooperation:J. Billen)
-
1Latest Papers from Table of Contents or Articles in PressA. Van Oystaeyen ; R. C. Oliveira ; L. Holman ; J. S. van Zweden ; C. Romero ; C. A. Oi ; P. d'Ettorre ; M. Khalesi ; J. Billen ; F. Wackers ; J. G. Millar ; T. Wenseleers
American Association for the Advancement of Science (AAAS)
Published 2014Staff ViewPublication Date: 2014-01-18Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: Animals ; Ants/*physiology ; Bees/*physiology ; Biological Assay ; *Biological Evolution ; Female ; Fertility/drug effects/*physiology ; Male ; Pheromones/classification/pharmacology/*physiology ; Reproduction/drug effects/physiology ; Wasps/*physiologyPublished by: -
2Articles: DFG German National LicensesHellings, P. W. ; Vandekerckhove, P. ; Claeys, R. ; Billen, J. ; Kasran, A. ; Ceuppens, J. L.
Oxford, UK : Blackwell Science Ltd
Published 2003Staff ViewISSN: 1365-2222Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: MedicineNotes: Background Sex hormones might affect the severity and evolution of bronchial asthma. From existing literature, there exists, however, no convincing evidence for either exacerbation or improvement of allergic symptoms by progesterone.Objective This study was aimed to explore the effect of exogenously administered progesterone in a mouse model of allergic asthma.Methods BALB/c mice were sensitized to ovalbumin (OVA) by intraperitoneal injections with OVA followed by chronic inhalation of nebulized OVA or physiologic saline (Sal). Medroxyprogesterone acetate or placebo was instilled daily into the oesophagus before and during the inhalatory OVA challenge phase.Results Progesterone worsened allergic airway inflammation in OVA-challenged mice, as evidenced by enhanced bronchial responsiveness to inhaled metacholine and increased bronchial eosinophilia. Elevated airway eosinophilia corresponded with higher bronchial and systemic IL-5 levels in the progesterone group. The ratio of IL-4/IFN-γ levels in bronchoalveolar lavage fluid and numbers of eosinophil colony-forming units in the bone marrow were also elevated in the latter group. Progesterone, however, did not influence allergen-specific IgE production, nor did it affect bronchial responses in Sal-challenged mice.Conclusion Our data show that exogenously administered progesterone aggravates the phenotype of eosinophilic airway inflammation in mice by enhancing systemic IL-5 production. Progesterone also increases bronchial hyper-reactivity.Type of Medium: Electronic ResourceURL: -
3Articles: DFG German National LicensesStaff View
ISSN: 0020-7322Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyType of Medium: Electronic ResourceURL: -
4Articles: DFG German National LicensesStaff View
ISSN: 0020-7322Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyType of Medium: Electronic ResourceURL: -
5Articles: DFG German National LicensesStaff View
ISSN: 0020-7322Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyType of Medium: Electronic ResourceURL: -
6Articles: DFG German National LicensesStaff View
ISSN: 0305-0491Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyChemistry and PharmacologyType of Medium: Electronic ResourceURL: -
7Articles: DFG German National LicensesStaff View
ISSN: 0305-0491Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyChemistry and PharmacologyType of Medium: Electronic ResourceURL: -
8Articles: DFG German National LicensesStaff View
ISSN: 1572-8889Keywords: Ponerinae ; Formicinae ; interspecific interactions ; trails ; recruitmentSource: Springer Online Journal Archives 1860-2000Topics: BiologyNotes: Abstract Gnamptogenys menadensis (subfamily Ponerinae) foragers use chemical trails to home to their nests. Although prey capture and retrieval are generally performed solitarily, trails seem to enhance foraging to areas rich in prey or to sugar sources. Trail laying and following are most conspicuous during nest migration. These trails are laid down by tapping the sting onto the substrate. In laboratory tests, only extracts from the Dufour's gland were readily followed. Workers of Polyrhachis rufipes (Formicinae) use the trails of G. menadensis to gain access to otherwise nonavailable sugar sources. When they encounter Gnamptogenys foragers, P. rufipes workers show a typical aggressive antennal boxing, to which Gnamptogenys reacts with a submissive behavior. This is the first report of commensalism between a ponerine and a formicine ant.Type of Medium: Electronic ResourceURL: -
9Articles: DFG German National LicensesStaff View
ISSN: 1420-9071Keywords: Ant ; Nothomyrmecia ; Dufour gland ; hydrocarbons ; farnesene ; springeneSource: Springer Online Journal Archives 1860-2000Topics: BiologyMedicineNotes: Summary The Dufour gland of the primitive Australian antNothomyrmecia macrops contains microgram quantities in total of linear alkanes and alkenes from C13 to C30 with heptadecene the major component (66%). In all, 50 substances, including methyl-branched hydrocarbons, aldehydes and acetates, α-farnesene and α-springene in low nanogram amounts, were identified by gas chromatography-mass spectrometry.Type of Medium: Electronic ResourceURL: -
10Articles: DFG German National LicensesStaff View
ISSN: 1420-9071Keywords: Formicidae ; Aenictus ; army ant ; trail pheromone ; methyl anthranilate ; methyl nicotinate ; primer pheromone ; releaser pheromoneSource: Springer Online Journal Archives 1860-2000Topics: BiologyMedicineNotes: Abstract Totally blind army ants carry out massive and highly organised foraging raids, apparently guided by chemical stimuli. Until now, this phenomenon has not been closely analysed. The existence of a trail pheromone in a postpygidial gland of anAenictus species has been demonstrated and the substances identified as methyl anthranilate and methyl nicotinate The pheromone consists of two parts: a primer effect, caused by methyl nicotinate, which prepares workers to follow trails, but is not itself followed, and a releaser effect, due to methyl anthranilate, which causes trail-following only in conjunction with the primer substance.Type of Medium: Electronic ResourceURL: -
11Articles: DFG German National LicensesUrbani, C. Baroni ; Boyan, G. S. ; Blarer, A. ; Billen, J. ; Musthak Ali, T. M.
Springer
Published 1994Staff ViewISSN: 1420-9071Keywords: Insect ; behaviour ; high-speed cinematography ; jumping ; electrophysiology ; evolutionSource: Springer Online Journal Archives 1860-2000Topics: BiologyMedicineNotes: Abstract The Indian antHarpegnathos saltator may be unique among insects in using its jumping capacity not only as an escape mechanism but also as a normal means of locomotion, and for catching its prey in flight. High-speed cinematography used to analyse the various phases of the jump suggests thatHarpegnathos employs a novel jumping mechanism to mediate these behaviours: namely the synchronous activation of its middle and hindlegs. Electrophysiological recordings from muscles or nerves in pairs of middle and hindlegs show remarkably synchronous activity during fictive jumping, supporting the synchronous activation hypothesis.Harpegnathos is not the only ant to jump, and a cladistic analysis suggests that jumping behaviour evolved independently three times during ant evolutionary history.Type of Medium: Electronic ResourceURL: -
12Articles: DFG German National LicensesStaff View
ISSN: 1420-9071Keywords: Ant ; Ponerinae ; reproduction ; exocrine glands ; queenlessSource: Springer Online Journal Archives 1860-2000Topics: BiologyMedicineNotes: Summary In the queenless antDiacamma australe, all workers eclose with a pair of tiny thoracic appendages (‘gemmae’). These are sac-like and exhibit a distinct cuticular sculpturing, with minute pores opening on the outer surface. These pores are connected to glandular cells which completely fill the appendages, and thus an exocrine stignal is likely to be released. We discuss the social context of this signal: only one worker in each colony retains the gemmae.Type of Medium: Electronic ResourceURL: -
13Articles: DFG German National LicensesStaff View
ISSN: 1570-7458Keywords: Hymenoptera ; Formicidae ; ants ; gland volumes ; lumen ; attine and myrmicine glands ; hydrocarbon reservoirSource: Springer Online Journal Archives 1860-2000Topics: BiologyType of Medium: Electronic ResourceURL: -
14Articles: DFG German National LicensesStaff View
ISSN: 1570-7458Keywords: Ants ; Dufour gland ; Camponotus aethiops ; Lasius fuliginosus ; queens ; hydrocarbons ; 2-alkanonesSource: Springer Online Journal Archives 1860-2000Topics: BiologyDescription / Table of Contents: Résumé Les sécrétions des glandes de Dufour sont toutes semblables et comprennent, chez les reines et les ouvrières de C. aethiops, une chaîne linéaire d'hydrocarbures de C10 à C15, avec C11 comme constituant principal. Les différences entre les castes se traduisent chez la reine, par une teneur totale en sécrétions plus faible et l'existence de C15 uniquement sous forme de traces. Chez L. fuliginosus, la sécrétion de la glande de Dufour comprend une série de chaînes linéaires d'hydrocarbures (C10−C17) avec l'undécane comme constituant principal, et une série de 2-alkanones allant de C13 à C19.Notes: Abstract The Dufour gland secretions of both virgin queens and workers of Camponotus aethiops are similar and consist of straight chain hydrocarbons ranging from C10−C15 with C11 the major compound. The difference between the two castes is that C15 appears only as a trace in queens, and the total amount of secretion is smaller in queens than in workers. In Lasius fuliginosus, the Dufour gland secretion contains a series of straight chain hydrocarbons (C10−C17) with undecane the major compound, and a series of 2-alkanones ranging from C13 to C19.Type of Medium: Electronic ResourceURL: -
15Articles: DFG German National LicensesOldham, N. J. ; Keegans, S. J. ; Morgan, F. D. ; Paiva, R. V. S. ; Brandão, C. R. F. ; Schoeters, E. ; Billen, J. P. J.
Springer
Published 1994Staff ViewISSN: 1432-1904Source: Springer Online Journal Archives 1860-2000Topics: BiologyChemistry and PharmacologyNatural Sciences in GeneralType of Medium: Electronic ResourceURL: -
16Articles: DFG German National LicensesOldham, N. J. ; Keegans, S. J. ; Morgan, E. D. ; Paiva, R. V. S. ; Brandão, C. R. F. ; Schoeters, E. ; Billen, J. P. J.
Springer
Published 1994Staff ViewISSN: 1432-1904Source: Springer Online Journal Archives 1860-2000Topics: BiologyChemistry and PharmacologyNatural Sciences in GeneralType of Medium: Electronic ResourceURL: -
17Articles: DFG German National LicensesStaff View
ISSN: 1432-1904Source: Springer Online Journal Archives 1860-2000Topics: BiologyChemistry and PharmacologyNatural Sciences in GeneralType of Medium: Electronic ResourceURL: -
18Articles: DFG German National LicensesStaff View
ISSN: 1432-1904Source: Springer Online Journal Archives 1860-2000Topics: BiologyChemistry and PharmacologyNatural Sciences in GeneralType of Medium: Electronic ResourceURL: -
19Articles: DFG German National LicensesStaff View
ISSN: 1432-1904Source: Springer Online Journal Archives 1860-2000Topics: BiologyChemistry and PharmacologyNatural Sciences in GeneralType of Medium: Electronic ResourceURL: -
20Articles: DFG German National LicensesStaff View
ISSN: 1432-1904Source: Springer Online Journal Archives 1860-2000Topics: BiologyChemistry and PharmacologyNatural Sciences in GeneralType of Medium: Electronic ResourceURL: