Eutetrarhynchid trypanorhynchs (Cestoda) from elasmobranchs off Argentina, including the description of Dollfusiella taminii sp. n. and Parachristianella damiani sp. n., and amended description of Dollfusiella vooremi (São Clemente et Gomes, 1989)

During a parasitological survey of teleosts and elasmobranchs in the Argentine Sea, 3 species of eutetrarhynchids were collected from the batoids Myliobatis goodei Garman and Psammobatis bergi Marini, and the shark Mustelus schmitti Springer. The specimens collected from Mu. schmitti were identified as Dollfusiela vooremi (São Clemente et Gomes, 1989), whereas the specimens from My. goodei and Ps. bergi resulted in new species of Dollfusiella Campbell et Beveridge, 1994 and Parachristianella Dollfus, 1946, respectively. Dollfusiella taminii sp. n. from Ps. bergi is characterised by a distinct basal armature with basal swelling and a heteroacanthous homeomorphous metabasal armature with 7–9 falcate hooks per principal row. Parachristianella damiani sp. n. from My. goodei lacks a distinct basal armature, having 2–3 initial rows of uncinate hooks, a heteroacanthous heteromorphous metabasal armature with the first principal row of small hooks, followed by rows with 10–14 large hooks. This is the first record of Parachristianella in the southwestern Atlantic. The amended description of D. vooremi includes the detailed description of the tentacular armature, including SEM micrographs of all tentacular surfaces. This species is characterised by a basal armature consisting of rows of uncinate and falcate hooks, a basal swelling and a metabasal armature with billhooks on the antibothrial surface and uncinate hooks on the bothrial surface. The scolex peduncle of D. vooremi is covered with enlarged spinitriches. This species is restricted to carcharhiniform sharks, since the report of D. vooremi in Sympterygia bonapartii Müller et Henle off Bahía Blanca (Argentina) is dubious.Fil: Menoret, Adriana. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Biodiversidad y Biología Experimental y Aplicada. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Biodiversidad y Biología Experimental y Aplicada; ArgentinaFil: Ivanov, Veronica Adriana. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Biodiversidad y Biología Experimental y Aplicada. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Biodiversidad y Biología Experimental y Aplicada; Argentin

Les formations quaternaires du Bassin de Huancayo et leur néotectonique (Andes Centrales Péruviennes)

In the Huancayo-Jauja intra-Andean basin, whose origin seems to be linked to a warping of the «Puna» tertiary erosion surface, an important set of quaternary formations was deposited. The oldest one is the «Jauja» lacustrine formation; the following ones constitute t', t" and t'" terraces, each one of them being contemporaneous with one glaciation stage. New observations allow to prove that the «Jauja » and t'" formations have been folded, generating a System of narrow anticlinal ripples as also large, flat synclinal basins. The terraces sedimentation and the deepening of the rio Mantaro gorges below the basin were also partly conditioned by a block tectonics which appears to continue at the present time. These new facts are then replaced into the frame of the basin and of the area climatic evolution, in the Quaternary

Les vulnérabilités des sociétés et des espaces urbanisés : concepts, typologie, modes d'analyse

International audienceLe thème des vulnérabilités des sociétés et des espaces urbanisés est abordé à partir de la vingtaine de communications qui, au cours du colloque de Clermont-Ferrand ont traité de cette question (Colloque international : "Croissance urbaine et risques naturels dans les pays en développement", Université Blaise Pascal, Clermont-Ferrand, 2-3 décembre 1994). Dans un premier temps, la synthèse présente les concepts et les différentes approches de la vulnérabilité. Un regard critique est ensuite porté sur la relation entre l’évaluation et la réduction de la vulnérabilité. Enfin, les possibilités de convergence entre les différentes approches sont examinées et des pistes de recherche sont lancées

Eight previously unidentified mutations found in the OA1 ocular albinism gene

BACKGROUND: Ocular albinism type 1 (OA1) is an X-linked ocular disorder characterized by a severe reduction in visual acuity, nystagmus, hypopigmentation of the retinal pigmented epithelium, foveal hypoplasia, macromelanosomes in pigmented skin and eye cells, and misrouting of the optical tracts. This disease is primarily caused by mutations in the OA1 gene. METHODS: The ophthalmologic phenotype of the patients and their family members was characterized. We screened for mutations in the OA1 gene by direct sequencing of the nine PCR-amplified exons, and for genomic deletions by PCR-amplification of large DNA fragments. RESULTS: We sequenced the nine exons of the OA1 gene in 72 individuals and found ten different mutations in seven unrelated families and three sporadic cases. The ten mutations include an amino acid substitution and a premature stop codon previously reported by our team, and eight previously unidentified mutations: three amino acid substitutions, a duplication, a deletion, an insertion and two splice-site mutations. The use of a novel Taq polymerase enabled us to amplify large genomic fragments covering the OA1 gene. and to detect very likely six distinct large deletions. Furthermore, we were able to confirm that there was no deletion in twenty one patients where no mutation had been found. CONCLUSION: The identified mutations affect highly conserved amino acids, cause frameshifts or alternative splicing, thus affecting folding of the OA1 G protein coupled receptor, interactions of OA1 with its G protein and/or binding with its ligand

Initiation aux exercices de géographie régionale

Dollfus Olivier. Initiation aux exercices de géographie régionale. In: Annales de Géographie, t. 78, n°425, 1969. pp. 85-86

Deux ou trois choses sur la recherche dans un parc national : le cas du Parc national des Ecrins

Dollfus Olivier. Deux ou trois choses sur la recherche dans un parc national : le cas du Parc national des Ecrins. In: Revue de géographie alpine, tome 86, n°1, 1998. pp. 11-17

Chaos bornés et monde actuel

Dollfus Olivier. Chaos bornés et monde actuel. In: Espace géographique, tome 19-20, n°4, 1990. pp. 302-308

Les entreprises multinationales

Dollfus Olivier. Les entreprises multinationales. In: Espace géographique, tome 19-20, n°2, 1990. p. 186