Une espece nouvelle de Cucullanus (Nematoda: Cucullanidae) parasite de Genypterus blacodes et G. brasiliensis (Pisces : Ophidiidae) de l'Atlantique Sud

Cucullanus genypteri sp. n, a parasite of Genypterus blacodes Schneider, 1801 and G. brasiliensis Reagan, 1903 (Pisces: Ophidiidae) from different zones of the South West Atlantic Ocean is described and illustrated. The new species is distinguished from other south american members in the genus Cucullanus Mueller, 1777 by the distribution pattern of caudal papillae and by the body measurements, particularly spicule length. C. genypteri represents the first description of a marine species of this genus from Argentina. Variations of parasitism in relation to host size, sex and geographic distribution are also discussed.Cucullanus genypteri n. sp. parasite de Genypterus blacodes Schneider, 1801 et de G. brasiliensis Reagan, 1903 (Pisces: Ophidiidae) de l'Atlantique Sud, est décrit et figuré. L'espèce nouvelle se différencie des autres espèces sud-américaines de Cucullanus Mueller, 1777 par la disposition des papilles caudales et par l'ensemble des dimensions, en particulier par la longueur des spicules. C. genypteri est la première espèce du genre décrite en Argentine. Les variations du parasitisme liées à la taille, au sexe et à la distribution géographique des hôtes sont commentées par les auteurs.Centro de Estudios Parasitológicos y de Vectore

Variational method and duality in the 2D square Potts model

The ferromagnetic q-state Potts model on a square lattice is analyzed, for q>4, through an elaborate version of the operatorial variational method. In the variational approach proposed in the paper, the duality relations are exactly satisfied, involving at a more fundamental level, a duality relationship between variational parameters. Besides some exact predictions, the approach is very effective in the numerical estimates over the whole range of temperature and can be systematically improved.Comment: 20 pages, 5 EPS figure

Effects of ivabradine on residual myocardial ischemia after PCI evaluated by stress echocardiography

Background. Residual angina after PCI is a frequently occurring disease. Ivabradine improves symptoms but its role in patients without left ventricular systolic dysfunction is still unclear. The aim was to quantify the effects of ivabradine in terms of MVO 2 indicators and diastolic function. Methods. Twenty-eight consecutive patients with residual angina after PCI were randomized to ivabradine 5 mg twice/day (IG) or standard therapy (CG). All patients performed a stress echocardiography at the enrollment and after 30 days. MVO 2 was estimated from double product (DP) and triple product (TP) integrating DP with ejection time (ET). Diastolic function was evaluated determining E and A waves, E′ measurements, and E/E′ ratio both at rest and at the peak of exercise. Results. The exercise time was longer in IG 9′49″ ± 48″ vs 8′09″ ± 59″ in CG (p=0.0001), reaching a greater workload (IG 139.3 ± 13.4 vs CG 118.7 ± 19.6 Watts; p=0.003). MVO 2 expressed with DP and TP was significantly higher in IG (DP: IG 24194 ± 2697 vs CG 20358 ± 4671.8, p=0.01; TP: IG 17239 ± 4710 vs CG 12206 ± 4413, p=0.007). At peak exercise, the ET was diminished in IG than CG. The analysis of diastolic function after the exercise revealed an increase of E and A waves, without difference in the E/A ratio. The E′ wave was higher in IG than CG, and in the same group, the differences between baseline and peak exercise were greater (ΔE′3.14 ± 0.7 vs 2.4 ± 1.13, p=0.047). The E/E′ ratio was reduced in patients treated with ivabradine (IG 10.2 ± 2.0 vs CG 7.9 ± 1.6, p=0.002). Conclusions. Ivabradine seems to produce a significant improvement of ischemic threshold, chronotropic reserve, and diastolic function

Une espece nouvelle de Cucullanus (Nematoda: Cucullanidae) parasite de Genypterus blacodes et G. brasiliensis (Pisces : Ophidiidae) de l'Atlantique Sud

Cucullanus genypteri sp. n, a parasite of Genypterus blacodes Schneider, 1801 and G. brasiliensis Reagan, 1903 (Pisces: Ophidiidae) from different zones of the South West Atlantic Ocean is described and illustrated. The new species is distinguished from other south american members in the genus Cucullanus Mueller, 1777 by the distribution pattern of caudal papillae and by the body measurements, particularly spicule length. C. genypteri represents the first description of a marine species of this genus from Argentina. Variations of parasitism in relation to host size, sex and geographic distribution are also discussed.Cucullanus genypteri n. sp. parasite de Genypterus blacodes Schneider, 1801 et de G. brasiliensis Reagan, 1903 (Pisces: Ophidiidae) de l'Atlantique Sud, est décrit et figuré. L'espèce nouvelle se différencie des autres espèces sud-américaines de Cucullanus Mueller, 1777 par la disposition des papilles caudales et par l'ensemble des dimensions, en particulier par la longueur des spicules. C. genypteri est la première espèce du genre décrite en Argentine. Les variations du parasitisme liées à la taille, au sexe et à la distribution géographique des hôtes sont commentées par les auteurs.Centro de Estudios Parasitológicos y de Vectore

Larvae and adults of <i>Hysterothylacium aduncum</i> (Rudolphi, 1802) (Nematoda: Anisakidae) in fishes and crustaceans in the South West Atlantic

La presence de Hysterothylacium aduncum (kudolphi, 1802) chez cinq especes de poissons et chez une espece de crustaces est signalee dans ce travail. Les larves du troisieme stade ont ete trouvees chez le crustace Themisto gaudichaudii et sur les mesenteres des poissons Engraulis anchoita et Merluccius hubbsi, les larves du quatrieme stade ont ete prelevees dans l'appareil digestif de M. hubbsi et de Scomber japonicus et les nematodes adultes ont ete recoltes dans l'estomac et dons l'intestin de M. hubbsi, S. japonicus, Genypterus blacodes et Genypterus brasiliensis. Les nematodes sont decrits, mesures et figures. La prevalence et l'intensite moyenne du parasitisme sont calculees chez les differents hotes et dans les differentes zones geographiques s'etendant de la Zone de Peche Commune Argentine-Uruguay aux cotes de la Patagonie. Une augmentation du parasitisme du nord au sud a ete observee. Un schema du cycle biologique de H. aduncum chez les especes d'hotes considerees dans cette etude, est propose par les auteurs.Hysterothylacium aduncum (Rudolphi, 1802) is reported from five fishes and one invertebrate species. Third-stage larvae were found in the crustacean Themisto gaudichaudii and in mesenteries of the fishes Engraulis anchoita and Merluccius hubbsi ; fourth-stage larvae were recovered from the digestive tract of M . hubbsi and Scomber japonicus and adult specimens were obtained from the stomach and intestine of M. hubbsi, S. japonicus, G enypterus blacodes and Genypterus brasiliensis. Nematodes are described, measured and illustrated. Parasitic prevalence, mean intensity and range were calculated in relation to different geographic zones, from the Argentinean-Uruguayan Common Fishing Zone to Patagonic areas. An increase of parasitism from the northern areas southwards was observed. The life-cycle of H. aduncum, involving the host species considered, is also postulated.Centro de Estudios Parasitológicos y de VectoresUniversidad Nacional de Mar del Plat

Genetic relationships among species of Contracaecum railliet & Henry, 1912 and Phocascaris Höst, 1932 (Nematoda: Anisakidae) from pinnipeds inferred from mitochondrial cox2 sequences, and congruence with allozyme data

The genetic relationships among 11 taxa, belonging to the genus Contracaecum (C. osculatum A, C. osculatum B, C. osculatum (s.s.), C. osculatum D, C. osculatum E, C. osculatum baicalensis, C. mirounga, C. radiatum, C. ogmorhini (s.s.), C. margolisi) and Phocascaris IPhocascaris cystophorae), parasites as adults of seals, were inferred from sequence analysis (519 bp) of the mitochbndrial cytochrome c oxidase subunit II (mtDNA cox2) gene. Phylogenetic analyses obtained from Parsimony (MP) and Neighbour-Joining (NJ) K2P distance values generated similar topologies, each well supported at major nodes. All analyses delineated two main clades: the first encompassing the parasites of the phocid seals, i.e. the C. osculatum species complex, C. osculatum baicalensis, C. mirounga and C. radiatum, with the latter two species forming a separate subclade; the second including the parasites of otarids, i.e. C. ogmorhini (s.s.) and C. margolisi. An overall high congruence between mtDNA inferred tree topologies and those produced from nuclear data sets (20 allozyme loci) was observed. Comparison of the phylogenetic hypothesis here produced for Contracaecum spp. plus Phocascaris with those currently available for their definitive hosts (pinnipeds) suggests parallelism between hosts and parasite phylogenetic tree topologies.Fil: Mattiucci, Simonetta. Università di Roma; ItaliaFil: Paoletti, M.. Università di Roma; Italia. Università degli Studi della Tuscia; ItaliaFil: Webb, S.C.. Cawthron Institute; Nueva ZelandaFil: Sardella, Norma Haydee. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Departamento de Biología. Laboratorio de Parasitología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata; ArgentinaFil: Timi, Juan Tomas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; ArgentinaFil: Berland, B.. University of Bergen; NoruegaFil: Nascetti, G.. Università degli Studi della Tuscia; Itali

Vortex Matter Transition in Bi2{}_2Sr2{}_2CaCu2{}_2O8+y{}_{8+y} under Tilted Fields

Vortex phase diagram under tilted fields from the $c$ axis in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+y}$ is studied by local magnetization hysteresis measurements using Hall probes. When the field is applied at large angles from the $c$ axis, an anomaly ($H_p^\ast$) other than the well-known peak effect ($H_p$) are found at fields below $H_p$. The angular dependence of the field $H_p^\ast$ is nonmonotonic and clearly different from that of $H_p$ and depends on the oxygen content of the crystal. The results suggest existence of a vortex matter transition under tilted fields. Possible mechanisms of the transition are discussed.Comment: Revtex, 4 pages, some corrections are adde

Pd-Doped Cellulose Carbon Aerogels for Energy Storage Applications

In order to implement a sustainable approach in the development of carbonaceous materials with improved capacitive properties, the development of Pd-doped cellulose carbon aerogels (CA-PdX) is presented. Upon introducing Pd nanoparticles to the carbonaceous matrix prior to the gel formation, carbon aerogels with various Pd content are prepared. Physicochemical properties (such as texture, morphology, crystal structure, and surface chemistry) of CA-PdX are revealed. Additionally, a comparative analysis in their electrochemical properties is performed to shed light on the effect of Pd incorporated into the matrices. It is found that Pd-doping leads to the significant enhancement of power and energy densities (2.9-fold and 55-fold, respectively) compared to those of carbon aerogel without doping (CA-Blank). The straightforward preparation method as well as the powerful control over the structure and composition pave the way toward the utilization of these hybrid materials in energy storage applications

Stratigraphic reassessment of Grotta Romanelli sheds light on Middle-Late Pleistocene palaeoenvironments and human settling in the Mediterranean

During the last century, Grotta Romanelli (Southern Italy) has been a reference site for the European Late Pleistocene stratigraphy, due to its geomorphological setting and archaeological and palaeontological content. The beginning of the sedimentation inside the cave was attributed to the Last Interglacial (MISs 5e) and the oldest unearthed evidence of human occupation, including remains of hearths, was therefore referred to the Middle Palaeolithic. Recent surveys and excavations produced new U/Th dates, palaeoenvironmental interpretation and a litho-, morpho- and chrono-stratigraphical reassessment, placing the oldest human frequentation of the cave between MIS 9 and MIS 7, therefore embracing Glacial and Interglacial cycles. These new data provide evidence that the sea reached the cave during the Middle Pleistocene and human occupation occurred long before MISs 5e and persisted beyond the Pleistocene- Holocene boundary