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Search Results: 1 - 10 of 333184 matches for " Martín F; Bobadilla "
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Divergencias en la estimación de receptividad ganadera en el noroeste de la Patagonia: diferencias conceptuales y consecuencias prácticas
Golluscio,Rodolfo A; Bottaro,Hugo; Rodano,Daniel; Garbulsky,Martín F; Bobadilla,Segundo; Buratovich,Osvaldo; Villa,Martín;
Ecolog?-a austral , 2009,
Abstract: an effective estimate of the carrying capacity of different vegetation types would contribute to reduce some grazing-induced desertification processes in patagonia. at present there are several methods in use. however, none can be considered "a priori" as the reference-method. in this study, we compared the estimates obtained by two commonly used in northwestern patagonia, aboveground net primary productivity method (mppna) and pastoral value method (mvp). using both methods, we calculated the carrying capacity for 119 sites encompassing a wide range of anpp (130 to 2100 kg dm.ha-1.y-1). estimates obtained using mppna were generally higher than those obtained using mvp, and the difference widened as anpp increased. we used path analysis to identify the determinants of both estimates and their difference. mppna values depend mainly on anpp, as the other component of the metric (harvest index) is also calculated as a function of anpp. on the other hand, mvp values are more strongly dependent on the value of forage consumed prior to measurement than on the pastoral value of the stand at that time (vpstand), as the latter is used to estimate the amount of forage available at the time of measurement. vpstand, in turn, depends more on forage cover than on the vp of the vegetation (vpveg). as expected, the difference between the two carrying capacity estimates widened as anpp increased and as forage consumed prior to measurement decreased. the difference between estimates also broadened as vpstand increased, reflecting an indirect effect of anpp as sites of high vpstand had also high anpp and forage cover. the analysis suggests that mppna and mvp provide the upper and lower limits, respectively, to carrying capacity estimates. these estimates could be improved by developing more reliable models for the estimation of harvest index and forage available at the time of measurement, reducing the sensitivity to anpp of the first variable and increasing the sensitivity to anpp of
PET-FDG Y Gammagrafía ósea en la enfermedad de Paget. A propósito de un caso.
Gil Martínez, Eduardo Manuel,Ramírez López, Miguel ángel,Millán Lisbona, Antonia,Fernández Bobadilla, Manuel
Alasbimn Journal , 2008,
Abstract: Exponemos el caso de un varón de 76 a os con molestias articulares difusas desde a os antes, que le aparece bruscamente un intenso dolor en hombro izquierdo. Se realizó radiografía del hombro, concluyéndose la compatibilidad con lesión ósea metastásica y la conveniencia de descartar una posible afectación prostática. Su analítica, mostró ligera elevación de fosfatasa alcalina, y una PET –FDG mostró únicamente, un foco de hipermetabolismo en tercio proximal de hombro izquierdo. Una gammagrafía ósea (GO) con 99mTc-MDP, presentó importante aumento de actividad osteogénica en región humeral proximal izquierda y hemipelvis derecha posiblemente relacionado con metástasis óseas (MO) o deEnfermedad de Paget (EP).Se realiza biopsiahumeral izquierda, descartándose enfermedad maligna primaria o metástasis. A raíz de los resultados de la GO y la PET, se realizó un segundo análisis de la radiología y la biopsia, concluyéndose en el diagnóstico de EP.Realizamos una revisión sobre este tipo de situaciones, a propósito de un caso. We present a case of a 76 years old man with widespread articulation pains since several years ago, that suddenly shows an intense pain in left shoulder. A left shoulder X-ray was performed and the conclusion was the compatibility with bone metastases (BM) from a possible prostate origin. The blood analysis showed light elevation of alkaline phosphatase. A FDG-PET showed pathologic uptake in left shoulder′s proximal third without any other anomalies, A 99mTc-MDP bone scintigraphy (BS) showed important pathologic uptake in left shoulder′s proximal third and in right pelvis, probably bound up with BM or Paget′s disease (PD).The humerus biopsy was negative for malignant primary disease or metastases. Then the BS and PET findings guided to a second sight of the X-ray and biopsy, looking for a process that would explain the increase of metabolism confirmed the PD diagnosis.We review the bibliography about this special kind of pathology, about one case.
La ciencia llama a la ciencia Science calls science
F. Martín Cazorla
Cuadernos de Medicina Forense , 2011,
Abstract:
Effects of El Ni o on beds of Ulva lactuca along the northwest coast of the Gulf of California, Mexico
I. Pacheco-Ruíz,F. Becerril-Bobadilla,J. A. Zertuche-González,A. Chee Barragán
Geofísica internacional , 2003,
Abstract: The effect of El Ni o 1997-1998 on the biomass and size of beds of the green alga Ulva lactuca L., along the northwest coast of the Gulf of California across the Canal de Ballenas, was evaluated in May 1998 and compared with May 1995, 1996 and 2000. The El Ni o event (97-98) had a significant negative effect on size and biomass. The percent cover area was reduced by 70%, and biomass by 80%, with respect to previous years. A complete recovery was observed in 2000. Growth of the algae was studied under controlled conditions in the laboratory. No significant effect of irradiance was detected, but temperature did have a significant effect on growth. Optimum growth was found at 18°C. Temperatures of 14°, 22° and 26°C caused reduced growth. A temperature of 30°C was lethal to U. lactuca.
Estimulación magnética transcraneana (EMT)
Bobadilla,Hernán; Fierro,Marco;
Revista Colombiana de Psiquiatría , 2002,
Abstract: transcranial magnetic stimulation (tms) is a new neurophysiologic technique that allows the induction of a electrical current in the brain using a magnetic field that can penetrate the subject's scalp and skull. the effect of the magnetic field and the induction of the current in the brain are not painful. the procedure is done while the subject is awake and no anesthesia is needed. there are two kinds of administration: single-pulse tms and repetitive tms (rtms). single-pulse tms is the administration of single stimulus. rtms is the administration of repetitive stimulus to same area of cerebral cortex. tms is safe and free of side-effects in most situations. however, there are some adverse effects. the principal is the induction of a muscle tension headache or a neck ache in approximately 3 of every 100 subjects studied. these are generally mild and respond easily to an aspirin or acetaminophen. there are relative and absolute contraindications to rtms. rtms should not be in patients with metal anywhere in the head, excluding the mouth, in subjects with cardiac pacemakers and implanted medication pumps, in patients with electrodes inside the heart and in persons with increased intracranial pressure. subjects with a history of seizures or a family history of epilepsy are at increased risk of a seizure and caution is needed when applying rtms to this persons. tms is being studied as a potential treatment for depression and other neurologic and psychiatric disorders. some studies have suggested that repetitive tms may be very useful instead of electroconvulsive therapy in treatment of drug-resistant depression.
Estimulación magnética transcraneana (EMT)
Hernán Bobadilla,Marco Fierro
Revista Colombiana de Psiquiatría , 2002,
Abstract: La estimulación magnética transcraneana (EMT) es una técnica neurofisiológica nueva que permite inducir una corriente eléctrica en el interior del cerebro mediante un campo magnético que atraviesa el cuero cabelludo y el cráneo sin causar dolor. Debido a esto no se requiere anestesia alguna. Existen dos tipos de aplicación: EMT simple y EMT repetitiva (EMTr). La primera hace referencia a la aplicación de estímulos únicos. La EMTr es la aplicación de estímulos repetidos con regularidad a una misma zona de la corteza cerebral. La EMT es segura y no tiene efectos colaterales la mayoría de las veces. No obstante, los más frecuentes son la presencia de cefalea o dolor en el cuello, leves en intensidad y ceden fácilmente con Aspirina o acetaminofén. Las contraindicaciones absolutas incluyen a las personas que tengan algún objeto metálico en la cabeza, con excepción de las prótesis dentales. También quienes tienen implantado marcapasos, bombas de infusión y aumento de la presión endocraneana. En personas con antecedentes personales o familiares de epilepsia debe guardarse especial precaución, debido al riesgo de convulsiones. La EMT se está estudiando como un tratamiento potencial para la depresión y otros trastornos neurológicos y psiquiátricos. Algunos estudios sugieren su utilidad en lugar de la terapia electroconvulsiva en pacientes con depresión resistente al tratamiento con antidepresivos. Transcranial magnetic stimulation (TMS) is a new neurophysiologic technique that allows the induction of a electrical current in the brain using a magnetic field that can penetrate the subject's scalp and skull. The effect of the magnetic field and the induction of the current in the brain are not painful. The procedure is done while the subject is awake and no anesthesia is needed. There are two kinds of administration: single-pulse TMS and repetitive TMS (rTMS). Single-pulse TMS is the administration of single stimulus. rTMS is the administration of repetitive stimulus to same area of cerebral cortex. TMS is safe and free of side-effects in most situations. However, there are some adverse effects. The principal is the induction of a muscle tension headache or a neck ache in approximately 3 of every 100 subjects studied. These are generally mild and respond easily to an aspirin or acetaminophen. There are relative and absolute contraindications to rTMS. rTMS should not be in patients with metal anywhere in the head, excluding the mouth, in subjects with cardiac pacemakers and implanted medication pumps, in patients with electrodes inside the heart and in persons with
Saul Kripke y la paradoja de Wittgenstein: un ensayo de crítica del escepticismo
Martín F.,Gustavo R.;
EPISTEME , 2006,
Abstract: saul kripke en su libro wittgenstein. on rules and private language (1982) presenta la denominada "paradoja de wittgenstein", también conocida como "paradoja del escéptico", la cual podría ser resumida de la siguiente manera: ?quién o qué garantiza, si no existe el lenguaje privado, que el seguimiento de una regla se mantendrá constante en el tiempo, especialmente en términos de los resultados obtenidos por su aplicación, cuando cada vez que sigo una regla tomo un curso de acción específico? los esfuerzos desplegados por kripke para intentar buscar una solución a esta paradoja se estrellan debido, y este es mi principal argumento en el presente trabajo, a que él hace uso de un "juego de lenguaje" diferente al empleado por wittgenstein, por lo que le otorga un significado diferente a los términos disposicionales.
Sobre la presencia de Paraptenodytes y Palaeospheniscus (Aves: Sphenisciformes) en la Formación Bahía Inglesa, Chile
CHáVEZ,MARTíN F;
Revista chilena de historia natural , 2007, DOI: 10.4067/S0716-078X2007000200010
Abstract: the present comment was motivated by the article by acosta-hospitaleche & canto (2005), and from the direct observation of some specimens of sphenicidae previously reported for the bahia inglesa formation, in the atacama region, chile. the lack of morphological characters that they allow the differentiation with the genus spheniscus and of associate diagnostic remains discard the assignment of cranial materials to palaeospheniscus. equally it is not possible to corroborate the assignment of specimens to paraptenodytes, being suggested the use of spheniscidae indet. aff. paraptenodytes for an isolated tarsometatarsus. it is also suggested the use of spheniscus spp. for the specimens previously referred to s. cf. chilensis and s. aff. humboldti. this way, the number of penguins registered in the formation decreases from nine to seven
Sobre la presencia de Paraptenodytes y Palaeospheniscus (Aves: Sphenisciformes) en la Formación Bahía Inglesa, Chile On the precense of Paraptenodytes y Palaeospheniscus (Aves: Sphenisciformes) on the Bahia Inglesa Formation, Chile
MARTíN F CHáVEZ
Revista chilena de historia natural , 2007,
Abstract: El presente comentario fue motivado por el artículo de Acosta-Hospitaleche & Canto (2005) y de la observación directa de algunos especímenes de Spheniscidae previamente reportados para la Formación Bahía Inglesa, en la región de Atacama, Chile. La falta de caracteres morfológicos que permitan la diferenciación con el género Spheniscus y de restos diagnósticos asociados, descartan la asignación de materiales craneales a Palaeospheniscus. Igualmente no es posible corroborar la asignación de especímenes a Paraptenodytes, sugiriéndose el uso de Spheniscidae indet. aff. Paraptenodytes para un tarsometatarso aislado. Se sugiere también el uso de Spheniscus spp. para los especímenes previamente referidos a S. cf. chilensis y S. aff. humboldti. De este modo, el número de pingüinos registrados en la formación se reduce de nueve a siete The present comment was motivated by the article by Acosta-Hospitaleche & Canto (2005), and from the direct observation of some specimens of Sphenicidae previously reported for the Bahia Inglesa Formation, in the Atacama region, Chile. The lack of morphological characters that they allow the differentiation with the genus Spheniscus and of associate diagnostic remains discard the assignment of cranial materials to Palaeospheniscus. Equally it is not possible to corroborate the assignment of specimens to Paraptenodytes, being suggested the use of Spheniscidae indet. aff. Paraptenodytes for an isolated tarsometatarsus. It is also suggested the use of Spheniscus spp. for the specimens previously referred to S. cf. chilensis and S. aff. humboldti. This way, the number of penguins registered in the formation decreases from nine to seven
Información Bibliográfica
Puertas, F.,Martín, M.
Materiales de Construccion , 2001,
Abstract:
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