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On agonistic behaviour among workers of the Ponerine antEctatomma ruidum (Hymenoptera: Formicidae) (1987)

Jaffé, K. ; Marquez, M.

Springer

Insectes sociaux 34 (1987), S. 87-95

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ISSN: 1420-9098

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Description / Table of Contents: Resume Les ouvrières reconnaissent leur territoire grâce aux odeurs mais ne semblent pas utiliser une phéromone spécifique pour le marquage de celui-ci. La durée de ces signaux odorants n'excède pas deux heures. Les phénomènes de reconnaissance territoriale semblent être aussi sous la dépendance d'autres signaux qui ne sont pas localisés sur le substrat. La reconnaissance entre membres d'une colonie est assurée par des substances chimiques volatiles produites par la tête et le gastre, probablement des phéromones d'alarme. La cuticule de cadavres lyophilisés peut réabsorber ces composés. Une hypothèse évolutive est proposée, pour laquelle la reconnaissance du congénère utiliserait des signaux, simplifiés pendant la pylogénèse, et se confondant avec des phéromones d'alarme. Parallèlement, les phéromones de reconnaissance territoriale seraient devenues la clé du comportement agonistique.

Notes: Summary Workers recognize their territory by odours but do not seem to use a specific pheromone for marking it. Odours signals on the territory last less than 2 hours. Other cues, not located on the substrate, seem also to be involed in territorial recognition. Nestmate recognition is achieved by volatile chemical signals produced in the head and gaster, the same as the alarm pheromones. Freeze dried ant bodies reabsorb these chemicals on the cuticle. An evolutionary hypothesis is proposed in which the nestmate recognition signals are simplified during phylogenetic development and fused with alarm pheromones. Parallel to this development, territorial recognition pheromones emerge as important components of agonistic behaviour.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02223827

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Effect of doping with chromium on the physicochemical properties of ironmolybdenum oxide systems (1989)

Arco, M. ; Martin, C. ; Rives, V. ; [et al.]

Springer

Journal of materials science 24 (1989), S. 3750-3755

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ISSN: 1573-4803

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract Iron-molybdenum oxide systems have been prepared by coprecipitation from aqueous solutions. Two sets of samples have been prepared, undoped and doped with chromium, and the results have been compared with those corresponding to a commercial catalyst now under use. The catalysts have been characterized by chemical analysis, X-ray diffraction, visible-ultraviolet (diffuse reflectance), nitrogen adsorption at 77 K for surface area and porosity and scanning electron microscopy. It has been concluded that the composition of the final solid strongly depends on the composition of the starting solutions, but that the presence of chromium does not severely affect the Mo—Fe ratio; on the contrary, the presence of chromium in the catalysts leads to an outstanding development of surface area.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02385766

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