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Search Results: 1 - 10 of 13497 matches for " Marcelo;Luque "
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The genus lobatostoma (Trematoda: Aspidocotylea) in the pacific coast of South America, with description of Lobatostoma veranoi new species, parasite of Menticirrhus ophycephalus (Teleostei: Sciaenidae)
Oliva, Marcelo E.;Luque, Jose L.;
Memórias do Instituto Oswaldo Cruz , 1989, DOI: 10.1590/S0074-02761989000200004
Abstract: the presence of three aspidocotyleans trematodes in marine fishes from perú and chile is reported. one of them, lobatostoma veranoi from the intestine of menticirrhus ophicephalu (sciaenidae) is considered a new species. distinct characteristcs of the new species are:a cirrus sac smaller than the pharynx; tail overlapping posteriorly the ventral disk; testis in the last third of the body and the presence of 64-66 marginal alveoli. the two other species are lobatostoma pacificum manter, 1940 found in trachinotus paitensis cuvier, 1830 from perú and chile and lobatostoma anisotremum oliva & carvajal, 1984 from the intestine of anisotremus scapularis (tschudi, 1844) from perú.
Metazoan Parasite Infracommunities in Five Sciaenids from the Central Peruvian Coast
Oliva, Marcelo E;Luque, José L;
Memórias do Instituto Oswaldo Cruz , 1998, DOI: 10.1590/S0074-02761998000200007
Abstract: parasitological analysis of 237 menticirrhus ophicephalus, 124 paralonchurus peruanus, 249 sciaena deliciosa, 50 sciaena fasciata and 308 stellifer minor from callao (perú) yielded 37 species of metazoan parasites (14 monogenea, 11 copepoda, 4 nematoda, 3 acanthocephala, 1 digenea, 1 aspidobothrea, 1 eucestoda, 1 isopoda and 1 hirudinea). only one species, the copepoda bomolochus peruensis, was common to all five hosts. the majority of the components of the infracommunities analyzed are ectoparasites. the brillouin index (h) and evenness (j′) were applied to the fully sampled metazoan parasite infracommunities. high values of prevalence and mean abundance of infection are associated to the polyonchoinean monogeneans; the low values of j' reinforce the strong dominance of this group in the studied communities. the paucity of the endoparasite fauna may be a consequence of the unstable environment due to an upwelling system, aperiodically affected by the el ni?o southern oscillation phenomena.
Monogenean parasitic on marine fishes from Perú and Chile: three new species and two new combinations
Oliva, Marcelo E.;Luque, José L.;
Memórias do Instituto Oswaldo Cruz , 1995, DOI: 10.1590/S0074-02761995000500005
Abstract: five species of monogeneans collected from marine fishes of the pacific coast of chile and perú were studied. three of them are new species: interniloculus chilensis n. sp. (capsalidae), neoheterobothrium insalaris n. sp. (diclidophoridae) and loxura peruensis n. sp. (axinidae) parasitic on sebastes capensis (scorpaenidae), paralichthys sp. (bothiidae) and belone scapularis (belonidae), respectively. two new combinations are proposed, intracotyle neghmei (microcotylidae) for neobivagina neghmei villalba, 1987 and hargicotlyle conceptionensis (diclidophoridae) for choricotyle conceptionensis villalba, 1987.
Metazoan Parasite Infracommunities in Five Sciaenids from the Central Peruvian Coast
Oliva Marcelo E,Luque José L
Memórias do Instituto Oswaldo Cruz , 1998,
Abstract: Parasitological analysis of 237 Menticirrhus ophicephalus, 124 Paralonchurus peruanus, 249 Sciaena deliciosa, 50 Sciaena fasciata and 308 Stellifer minor from Callao (Perú) yielded 37 species of metazoan parasites (14 Monogenea, 11 Copepoda, 4 Nematoda, 3 Acanthocephala, 1 Digenea, 1 Aspidobothrea, 1 Eucestoda, 1 Isopoda and 1 Hirudinea). Only one species, the copepoda Bomolochus peruensis, was common to all five hosts. The majority of the components of the infracommunities analyzed are ectoparasites. The Brillouin index (H) and evenness (J′) were applied to the fully sampled metazoan parasite infracommunities. High values of prevalence and mean abundance of infection are associated to the polyonchoinean monogeneans; the low values of J' reinforce the strong dominance of this group in the studied communities. The paucity of the endoparasite fauna may be a consequence of the unstable environment due to an upwelling system, aperiodically affected by the El Ni o Southern Oscillation phenomena.
Distribution Patterns of Microcotyle nemadactylus (Monogenea) on Gill Filaments of Cheilodactylus variegatus (Teleostei)
Oliva Marcelo E,Luque José L
Memórias do Instituto Oswaldo Cruz , 1998,
Abstract:
The metazoan parasites of Stellifer minor (Tschudi, 1844): an ecological approach
Oliva, Marcelo E.;Luque, Jose L.;Iannacone, Jose A.;
Memórias do Instituto Oswaldo Cruz , 1990, DOI: 10.1590/S0074-02761990000300003
Abstract: a quantitative and qualitative analysis of the parasite fauna of the sciaenid stellifer minor (tschudi) from chorrillos, peru, was made. some characteristics of the infectious processes, in terms of intensity and prevalence of infection, as a function of host sex and size, are given. moreover, comments on the characteristics of the parasite fauna, related with host role in the marine food webs are included. the parasite fauna of stellifer minor taken of chorrillos, peru, include the monogeneans pedocotyle annakohni, pedocotyle bravoi, rhamnocercus sp. and cynoscionicola sp., the digenean helicometra fasciata, the adult acantocephalan rhadinorhynchus sp. and the larval corynosoma sp., the nematode procamallanus sp., the copepods caligus quadratus, clavellotis dilatata and bomolochus peruensis and one unidentified isopod of the family cymothoidae. a distinctive characteristic of the parasite fauna (metazoa) of s. minor is the almost absence of larval forms.
Kudoa sciaenae (Myxozoa: Multivalvulidae) cysts distribution in the somatic muscles of Stellifer minor (Tschudi, 1844) (Pisces: Sciaenidae)
Oliva, Marcelo;Luque, Jose Luis;Teran, Luz;Llican, Leonardo;
Memórias do Instituto Oswaldo Cruz , 1992, DOI: 10.1590/S0074-02761992000100006
Abstract: the distribution of kudoa sciaenae cysts (myxozoa), in terms of intensity and prevalence, in the somatic muscles of the sciaenid stellifer minor, shows an apparent preference for the anterior body region, including the head. the observed preference seems to be a consequence of the differential distribution of muscle mass, in the defined area, because when density (cyst/g dry muscle), is considered, all the somatic areas, but not cephalic area, do no show significant differences in terms of mean intensity and prevalence.
Aislamiento, identificación y da os asociados al síndrome de la muerte súbita en el cultivo de soja en Argentina Isolation, identification and yield losses associated with sudden death syndrome in soybeans in Argentina
María Mercedes Scandiani,Marcelo Aníbal Carmona,Alicia Graciela Luque,Kedma da Silva Matos
Tropical Plant Pathology , 2012, DOI: 10.1590/s1982-56762012000500009
Abstract: Los objetivos de este trabajo fueron aislar e identificar los agentes causales del síndrome de la muerte súbita (SMS) en muestras provenientes de diferentes localidades de Argentina, y cuantificar la incidencia de la enfermedad y los da os causados a campo en el rendimiento. Se analizaron 215 raíces provenientes de plantas con síntoma foliares típicos de SMS para el aislamiento e identificación de los agentes causales. Para realizar las pruebas de patogenicidad se efectuaron dos bioensayos en invernáculo. Los da os fueron estimados en un ensayo a campo situado en Pergamino a través de la cuantificación del rendimiento de muestras apareadas. El 36% (78 raíces) de las raíces presentó signos de Fusarium, compatibles con los causantes de SMS. Los estudios morfológicos realizados permitieron identificar 35 aislamientos como F. tucumaniae y 18, como F. virguliforme. Otros ocho aislamientos no pudieron identificarse. Todos los aislamientos inoculados reprodujeron los síntomas foliares típicos de SMS. Se observaron diferencias entre el peso de mil granos de plantas sanas y de plantas enfermas y entre el rendimiento potencial y el real (p<0,05). Los da os promedio fueron de 1514 kg/ha (rango 192-3770 kg/ha). Los resultados obtenidos corroboraron la distribución y predominio de F. tucumaniae y F. viguliforme en el área estudiada y su potencial destructivo. The main objectives of this work were to isolate and identify the causal agents of sudden death syndrome (SDS) from samples collected in different Argentinean localities, to quantify its incidence, and to estimate yield losses. Two hundred and fifteen roots from plants with typical SDS foliar symptoms were analyzed. In order to perform pathogenicity tests, two bioassays were conducted in the greenhouse. Yield losses were estimated in a field trial located in Pergamino by quantification and comparison of yield of paired samples. Thirty-six percent of total roots (78 roots) presented signs of Fusarium, compatible with signs caused by SDS. Morphological studies allowed the identification of 35 isolates as F. tucumaniae and 18 as F. virguliforme. Other eight isolates could not be identified. All isolates that were inoculated reproduced typical SDS foliar symptoms. Significant differences were observed between healthy and diseased plants for 1000-grain weight and between potential and real yield (p<0.05). Average yield loss was 1514 kg/ha (range 192-3770 kg/ha). These results corroborated the distribution and predominance of F. tucumaniae and F. viguliforme in the area under study and its destructive potential.
Automatic Mapping Tasks to Cores - Evaluating AMTHA Algorithm in Multicore Architectures
Laura De Giusti,Franco Chichizola,Marcelo Naiouf,Armando De Giusti,Emilio Luque
Computer Science , 2010,
Abstract: The AMTHA (Automatic Mapping Task on Heterogeneous Architectures) algorithm for task-to-processors assignment and the MPAHA (Model of Parallel Algorithms on Heterogeneous Architectures) model are presented. The use of AMTHA is analyzed for multicore processor-based architectures, considering the communication model among processes in use. The results obtained in the tests carried out are presented, comparing the real execution times on multicores of a set of synthetic applications with the predictions obtained with AMTHA. Finally current lines of research are presented, focusing on clusters of multicores and hybrid programming paradigms.
GOMECISMO Y EDUCACIóN: REFORMA, CONTRARREFORMA Y NUEVAS REFORMAS. 1900- 1930
Luque,Guillermo;
Investigación y Postgrado , 2001,
Abstract: as curious it may look like, the educative matter under gomecism has not received the same historian?s attention from one or another trend of thought; the study of the economical and political matters have been more exhaustive than the cultural aspects, in general, and particularly the evolution of our scholar system. as gomecism we understand the system initiated with the restoring revolution under cipriano castro′s lead, whose most noticeable features are: the presidentialism, the elimination of leaders, the centralism, the andean presence in the national politics and the domain of a positivist liberal elite, placed backwards to the majority′s interests. gómez continued the political begun by castro. referring to education, three figures left their track in that period since 1899 through 1935 and beyond. these were: the historian josé gil fortoul, the doctor felipe guevara rojas and the jurist rubén gonzález. each one of them worked under very particular political circumstances which, in part, explain their performance. to that historical circumstance we should add the particular education of each one of them, their political orientations, and their sense of citizen responsibility. the essential is that, even though gomecism did not characterize by promoting the national education beyond elementary school and university for exclusive groups, it is possible to find in its interior critics, innovations, reflections and even clashes on aspects such as the state intervention and the laicism, just to point out a few. this is what we are proposed to present.
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