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Search Results: 1 - 10 of 199898 matches for " Sebastián Fracchia "
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Aa achalensis Schltr (Orchidaceae) en la Sierra de Velasco, La Rioja, Argentina
Sobral,Ana; Fracchia,Sebastián;
Kurtziana , 2010,
Abstract: identification of aa achalensis in the sierra de velasco ravines in la rioja province, enlarge the distribution of this species, previously claimed as endemic of the san luis and córdoba mountains in central argentina.
Aa achalensis Schltr (Orchidaceae) en la Sierra de Velasco, La Rioja, Argentina Aa achalensis Schltr (Orchidaceae) in the Sierra de Velasco, La Rioja province, Argentina.
Ana Sobral,Sebastián Fracchia
Kurtziana , 2010,
Abstract: Basándose en la identificación de ejemplares colectados en las quebradas de la Sierra de Velasco, La Rioja, se extiende el rango de distribución de la especie Aa achalensis, declarada previamente como endémica de las sierras de Córdoba y San Luis en el centro de Argentina. Identification of Aa achalensis in the Sierra de Velasco ravines in La Rioja province, enlarge the distribution of this species, previously claimed as endemic of the San Luis and Córdoba mountains in central Argentina.
La biología de Pogonomyrmex cunicularius pencosensis (Hymenoptera: Formicidae) en relación con su comportamiento como dispersora de semillas coneleosoma en el Noroeste semiárido argentino The biology of Pogonomyrmex cunicularius pencosensis (Hymenoptera: Formicidae) in relationship to its behaviour as disperser of elaiosome-bearing seeds in semiarid Northwest Argentina
Adriana Aranda-Rickert,Sebastián Fracchia
Revista de la Sociedad Entomol?3gica Argentina , 2012,
Abstract: Pogonomyrmex cunicularius pencosensis Forel es la dispersora dominante de semillas con eleosoma en el Desierto del Monte septentrional del Noroeste semiárido de Argentina. En este trabajo, se estudian varios aspectos de la biología de esta especie de hormiga, relacionados con su capacidad para dispersar semillas mirmecócoras. Se presentan datos sobre la nidificación, el tama o de la colonia, la dieta y la estrategia de forrajeo de P. cunicularius pencosensis. Finalmente, se discute cómo todos estos aspectos de la historia natural de P. cunicularius pencosensis podrían influenciar positivamente sobre la dispersión de semillas mirmecócoras de plantas nativas del área de estudio, así como sus implicancias ecológicas y evolutivas. Pogonomyrmex cunicularius pencosensis Forel is the dominant disperser of elaiosome bearing seeds in the northern Monte Desert of semiarid Northwest Argentina. In this study, various aspects of the biology of this ant species were examined and related to its ability to disperse myrmecochorous seeds. Data are presented on P. cunicularius pencosensis nesting habits, colony size, feeding habits and foraging behaviour. Finally, it is discussed how all these aspects of the life history of P. cunicularius pencosensis may positively influence the seed dispersal of native myrmecochorous plants, as well as their ecological and evolutive implications.
Cultivo de una cepa comercial de Pleurotus ostreatus en desechos de Simmondsia chinensis y Jatropha macrocarpa
Fracchia, Sebastián;Aranda Rickert, Adriana;Terrizzano, Esteban;
Revista mexicana de micología , 2009,
Abstract: the feasibility of the cultivation of a pleurotus ostreatus strain was evaluated on wastes of two plant species cultivated in north-west argentina: simmondsia chinensis and jatropha macrocarpa. the mycelial growth of p. ostreatus was analysed on petri dishes containing different proportions of both plant species wastes. the combination 4:1 of j. macrocarpa/s. chinensis resulted as the most effective on the vegetative growth of p. ostreatus. subsequently it was carried out the experimental culture under controlled conditions of light, temperature and humidity. six treatments were done with different combinations of wheat straw and the plant wastes. j. macrocarpa and s. chinensis combination resulted as the most effective, with a biological efficiency of 89.7% and a production rate of 1.74%. both substrates are a feasible alternative for the commercial production of pleurotus genus in regions where no cereals crops are cultivated, like in the province of la rioja, argentina.
Cultivo de una cepa comercial de Pleurotus ostreatus en desechos de Simmondsia chinensis y Jatropha macrocarpa Culture of a commercial strain of Pleurotus ostreatus on Simmondsia chinensis and Jatropha macrocarpa residues
Sebastián Fracchia,Adriana Aranda Rickert,Esteban Terrizzano
Revista mexicana de micología , 2009,
Abstract: Se evaluó la factibilidad del cultivo de una cepa de Pleurotus ostreatus en desechos de dos especies vegetales cultivadas en el noroeste de Argentina: Simmondsia chinensis y Jatropha macrocarpa. Se analizó el crecimiento micelial de P. ostreatus en cajas de Petri conteniendo distintas proporciones de los desechos de ambas especies. La combinación de 4:1 de J. macrocarpa/S. chinensis resultó la más efectiva en el crecimiento vegetativo de P. ostreatus. Posteriormente se realizó el cultivo experimental en condiciones controladas de luz, temperatura y humedad. Se evaluaron seis tratamientos combinando paja de trigo y los desechos nombrados. La combinación de J. macrocarpa y S. chinensis resultó la más efectiva con una eficiencia biológica de 89.7% y una tasa de producción de 1.74%. Ambos sustratos son una alternativa viable para la producción comercial de Pleurotus en regiones donde no se cultivan cereales, como la provincia de La Rioja, Argentina. The feasibility of the cultivation of a Pleurotus ostreatus strain was evaluated on wastes of two plant species cultivated in north-west Argentina: Simmondsia chinensis and Jatropha macrocarpa. The mycelial growth of P. ostreatus was analysed on Petri dishes containing different proportions of both plant species wastes. The combination 4:1 of J. macrocarpa/S. chinensis resulted as the most effective on the vegetative growth of P. ostreatus. Subsequently it was carried out the experimental culture under controlled conditions of light, temperature and humidity. Six treatments were done with different combinations of wheat straw and the plant wastes. J. macrocarpa and S. chinensis combination resulted as the most effective, with a biological efficiency of 89.7% and a production rate of 1.74%. Both substrates are a feasible alternative for the commercial production of Pleurotus genus in regions where no cereals crops are cultivated, like in the Province of La Rioja, Argentina.
Book Review: Bocquet-Appel, Jean-Pierre and Ofer Bar-Yosef (Eds.). (2008). The Neolithic Demographic Transition and its Consequences. New York: Springer.
Helena Fracchia
Canadian Studies in Population , 2010,
Abstract:
Evolución estructural del basamento ígneo-metamórfico en la estancia Las Tres Hermanas, noreste de la comarca del Deseado, Santa Cruz Structural evolution of the igneous-metamorphic basement in the Estancia Tres Hermanas, northeast of the Deseado region, Santa Cruz
D. Fracchia,R. Giacosa
Revista de la Asociación Geológica Argentina , 2006,
Abstract: En la evolución estructural del basamento ígneo-metamórfico paleozoico del noreste de la comarca del Deseado son evidentes dos etapas fundamentales, acontecidas con anterioridad al Pérmico temprano. En el Silúrico tardío se desarrolló una etapa D1 de intensa deformación dúctil con evidencias de tres fases de deformación progresiva, acompa ada de metamorfismo y magmatismo granítico sincinemático. En la fase F1a, caracterizada por deformación dúctil con aplastamiento heterogéneo y asociada a metamorfismo de grado medio y diques graníticos sincinemáticos, se desarrollaron la foliación penetrativa, los pliegues P1a y el boudinage. Durante F1b, en un régimen con mayor dominio de plane strain, se deformaron las estructuras anteriores mediante pliegues P1b de rumbo NNO y vergencia NE. Posteriormente delgados diques graníticos intruyeron a estas estructuras. Finalmente, durante F1c, y aún en condiciones de grado metamórfico medio, se formaron discretas zonas de cizalla dúctil de rumbo NNO y cinemática dextral. La etapa de deformación D2 comienza con la fase F2a, bajo un régimen transcurrente dextral en condiciones de bajo grado metamórfico, caracterizado por una zona de cizalla frágil-dúctil que yuxtapone rocas de distintos dominios tectónicos. Posteriormente, durante la fase F2b, se desarrolló una peque a faja de corrimientos y pliegues P2 de rumbo NNO, posiblemente bajo las mismas condiciones transpresivas de la F2a. Estas estructuras de la etapa D2 habrían sido parte del proceso de exhumación del basamento antes del Pérmico temprano. A pesar de representar diferentes condiciones corticales, las estructuras formadas durante las etapas D1 y D2 tienen una compatibilidad geométrica y cinemática que indica un importante acortamiento en dirección NNE-SSO ó NE-SO. Esto sugiere que las condiciones geodinámicas que controlaron la evolución del orógeno paleozoico de la comarca del Deseado fueron similares durante el lapso Silúrico tardío-Pérmico temprano. The structural evolution of Paleozoic basement in northeast of the Deseado region (Southern Patagonia) is described in terms of two deformation stages occurred in the pre-Early Permian. In Late Silurian intense ductile deformation (D1) occurred along three progressive phases. During a first F1a phase with inhomogeneous strain coeval with medium grade metamorphism and synkinematic magmatism, penetrative foliation, P1a folds and boudinage developed. During F1b phase with predominant plane strain conditions, NNW-striking NE-vergent P1b folds affected former structures. Later on some more granitic dikes intruded P1b folds
Marta Lorente Sari ena (coord.), De justicia de jueces a justicia de leyes: hacia la Espa a de 1870.
Sebastián Martín
Forum Historiae Iuris , 2008,
Abstract:
Hypothalamic metabolic compartmentation during appetite regulation as revealed by magnetic resonance imaging and spectroscopy methods
Sebastián Cerdán
Frontiers in Neuroenergetics , 2013, DOI: 10.3389/fnene.2013.00006
Abstract: We review the role of neuroglial compartmentation and transcellular neurotransmitter cycling during hypothalamic appetite regulation as detected by Magnetic Resonance Imaging (MRI) and Spectroscopy (MRS) methods. We address first the neurochemical basis of neuroendocrine regulation in the hypothalamus and the orexigenic and anorexigenic feed-back loops that control appetite. Then we examine the main MRI and MRS strategies that have been used to investigate appetite regulation. Manganese-enhanced magnetic resonance imaging (MEMRI), Blood oxygenation level-dependent contrast (BOLD), and Diffusion-weighted magnetic resonance imaging (DWI) have revealed Mn2+ accumulations, augmented oxygen consumptions, and astrocytic swelling in the hypothalamus under fasting conditions, respectively. High field 1H magnetic resonance in vivo, showed increased hypothalamic myo-inositol concentrations as compared to other cerebral structures. 1H and 13C high resolution magic angle spinning (HRMAS) revealed increased neuroglial oxidative and glycolytic metabolism, as well as increased hypothalamic glutamatergic and GABAergic neurotransmissions under orexigenic stimulation. We propose here an integrative interpretation of all these findings suggesting that the neuroendocrine regulation of appetite is supported by important ionic and metabolic transcellular fluxes which begin at the tripartite orexigenic clefts and become extended spatially in the hypothalamus through astrocytic networks becoming eventually MRI and MRS detectable.
El problema del nominalismo en la definición spinozista del alma
Braicovich, Rodrigo Sebastián;
Diánoia , 2008,
Abstract: the answer that i give to the problem of nominalism in the work of baruch spinoza determines in a decisive fashion the possibilities of replying affirmatively to the question about human nature. to decide (along with a large number of contemporary interpreters of spinoza's philosophy) that the latter is ultimately built upon nominalistic principles forces us to do away with every ontological foundation of human nature, touchstone concept of spinoza's deduction both of the affects and of the therapeutic strategies that show the way to beatitudo. my aim, on the contrary, consists in bringing to light the necessarily universal component that underlies spinoza's psychology. aiming at this, i review not only certain key aspects regarding the problem of the kinds of knowledge, but also the spinozistic theory of definition.
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