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Search Results: 1 - 10 of 5086 matches for " Luz Roa "
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Los Jóvenes de Familias Tareferas de los Barrios Periurbanos: ?La Generación del Cambio?
Luz Roa,María;
Psicoperspectivas , 2012, DOI: 10.5027/psicoperspectivas-Vol11-Issue1-fulltext-170
Abstract: from the mid-90's in the province of misiones there was generated a process of expulsion of agricultural workers living in the countryside. this population was concentrated in the periurban areas of intermediate cities in the province, and today they depend on the temporary work in the yerba mate harvest ?tarefa- and occasional jobs in town. as part of these processes, young people are the first generation who was socialized in such territories. this study aims to understand and explain the young people contributions to the family reproduction strategies, in the case of families from the suburban areas of the oberá city, whose members work as yerba mate harvesters. in this regard, we observe substantial transformations between current contributions and those young people made when they resided in the country side -generation of their fathers and mothers-, which vary by gender and family types. to assess these processes, we adopt a triangular approach, combining data from a inquest of peri-urban households in oberá and qualitative information from ethnographic fieldworks.
Sufriendo en el yerbal… Los procesos de self en jóvenes de familias tareferas
María Luz Roa
Revista Latinoamericana de Ciencias Sociales, Ni?ez y Juventud , 2013,
Abstract: En este artículo presento un análisis de los procesos de constitución del self e jóvenes de familias de cosecheros de yerba mate -tareferos y tareferas- que residen en los barrios periurbanos de la provincia de Misiones (Noreste de Argentina), indagando sobre las dimensiones corporal, situacional y emocional. Reflexiono particularmente sobre los procesos de objetivación de identidades juveniles, considerando el lugar protagónico que tiene la emoción del sufrimiento en su conformación. Al respecto, observo que los sujetos jóvenes trazan diversas estrategias ligadas a la resistencia por asumir la identidad tarefera sufrida de sus padres y madres. Tales hallazgos demuestran el lugar protagónico de la emoción corporizada en la objetivación de ciertas relaciones sociales. Para evaluar estas cuestiones, adopto una metodología etnográfica.
Expression of the metalloproteases MMP-1, MMP-2, MMP-3, MMP-9, MMP-11, TIMP-1 and TIMP-2 in angiocentric midfacial lymphomas
Abelardo Meneses-García, Alejandro Betancourt, Jorge Abarca, Adriana Montes, Lourdes Roa, Luz Ruíz-Godoy
World Journal of Surgical Oncology , 2008, DOI: 10.1186/1477-7819-6-114
Abstract: Twenty cases of this type of lymphomas were studied and collected patient clinical data. The expressions of MMP-1, 2, 3, 9, 11, 13 and TIMP-1, 2 were studied by immunohistochemistry. Ultrastructural studies were performed in two cases. Statistical analysis was done with Fisher's exact test, Chi2 test.Of the 20 patients, 13 were men with median age of 43 years. In 13 patients the primary tumor was localized in the nasal cavity. Treatment was combined chemotherapy and radiotherapy in 60%. The 55% advanced clinical stages, 70% died from the disease. There were neoplastic cell and peritumoral fibroblasts positivity to MMP-1 and MMP-11 in most of the cases. The MMPs-2, 3 and 9 were expressed in neoplastic cell between 30 to 65%of the cases. TIMP-1 was presented mainly in the epithelium and TIMP-2 was poor expressed of the all cases.There were no statistical significance between the different enzymes used and the clinical parameters, besides status and survival of the patients. It is necessary to study more enzymes and focus them to quantify and determine their activity, in order to have a better correlation with histological features in this type of neoplasm.Nasal-type extranodal T/natural killer (T/NK) cell lymphomas represent a distinctive clinico-pathological entity, characterized by progressive destruction. This type of lymphoma generally originates in the nasal cavity, the palate or midfacial region, and its main characteristic is angioinvasion and angiodestruction, accompanied by extensive areas of necrosis [1-4].The typical localization of this neoplasm is the nasal cavity; however, it may also appear in the palate, adjacent anatomic regions and/or distant tissues, such as gastrointestinal, testicular, liver, spleen, central nervous system, and even lymph node tissue [1,5,6]. Nasal type extraganglionary T/NK cell lymphomas have a characteristic geographical distribution. They show predominance in Asian and Latin American countries, including Mexico [7-10], and rar
Saavedra-Díaz,Lina M.; Roa-Varón,Adela; Acero P.,Arturo; Mejía,Luz Stella;
Boletín de Investigaciones Marinas y Costeras - INVEMAR , 2004,
Abstract: five cruises were made between october 1998 and april 1999 in order to improve the knowledge about the fish fauna of the upper continental slope in the colombian caribbean, as a part of the project “invemar macrofauna i”. a total of 80 trawls were made during five cruises between october of 1998 and april of 1999, distributed along of the ecoregions of guajira, palomino, tayrona, magdalena, morrosquillo, and darién, along the continental slope of the colombian caribbean between 200 and 525 m depth using a semi-balloon trawling net. nineteen species of the orders albuliformes, anguilliformes, osmeriformes, stomiiformes, ateleopodiformes, aulopiformes, and pleuronectiformes are reported for the first time from colombian waters, and the presence of two others is ratified. the results show a first report for the caribbean, three first reports for the southern caribbean, and 15 first reports for the colombian caribbean. the data extend the depth range of two species and the maximum size of another one.
Roa-Varón,Adela; Saavedra-Díaz,Lina M.; Acero P.,Arturo; Mejía M.,Luz S.;
Boletín de Investigaciones Marinas y Costeras - INVEMAR , 2007,
Abstract: between 1998 and 1999, the expedition invemarmacrofauna i was conducted through the colombian caribbean slope, from punta estrella (guajira) to cabo tiburón, near the panamá border. eighty trawls were performed between 200 and 500 m depth, with a semi balloon net. seventeen first records of fishes for the colombian caribbean of the orders myctophiformes, polymixiiformes, gadiformes, ophidiiformes, and lophiiformes are listed here. diplacanthopoma brachysoma is a first record for the caribbean and neoscopelus microchir, chaunax pictus and malthopsis gnoma are also first records for the southern caribbean. neobythites gilli includes other two species that were recently validated, n. ocellatus y n. monocellatus.
El derecho a la salud de las mujeres víctimas del conflicto armado.El enfoque psicosocial (Sentencia T-045 de 2010)
Jorge Ernesto Roa Roa
Revista Derecho del Estado , 2010,
La libertad de expresión en las redes sociales y los casos de “school bullying”. La pérdida y el coste de oportunidad en la Sentencia T-713 de 2010
Jorge Ernesto Roa Roa
Revista Derecho del Estado , 2011,
La protección del espacio público y los derechos de los trabajadores informales
Jorge Roa
Revista Derecho del Estado , 2009,
Role of GnRH Neurons and Their Neuronal Afferents as Key Integrators between Food Intake Regulatory Signals and the Control of Reproduction
Juan Roa
International Journal of Endocrinology , 2013, DOI: 10.1155/2013/518046
Abstract: Reproductive function is regulated by a plethora of signals that integrate physiological and environmental information. Among others, metabolic factors are key components of this circuit since they inform about the propitious timing for reproduction depending on energy availability. This information is processed mainly at the hypothalamus that, in turn, modulates gonadotropin release from the pituitary and, thereby, gonadal activity. Metabolic hormones, such as leptin, insulin, and ghrelin, act as indicators of the energy status and convey this information to the reproductive axis regulating its activity. In this review, we will analyse the central mechanisms involved in the integration of this metabolic information and their contribution to the control of the reproductive function. Particular attention will be paid to summarize the participation of GnRH, Kiss1, NPY, and POMC neurons in this process and their possible interactions to contribute to the metabolic control of reproduction. 1. Introduction From an evolutionary point of view, the integration of the circuits controlling metabolism and reproduction is essential for the survival and perpetuation of the species. Wasting of energy on reproduction, in situations of deficit in food availability, may threaten the survival of the individuals and their progeny. Reproduction is a costly process in terms of energy consumption. Thus, in times of famine or under certain pathological conditions, which cannot ensure the correct utilization of the metabolic resources (anorexia nervosa, obesity, diabetes, lipodystrophies, etc.), the body has to define priorities to preserve physiological processes essential for survival [1]. In this sense, key physiological activities as blood circulation or neural activity cannot be compromised, whereas others, such as locomotion, thermoregulation, or growth can be reduced in conditions of metabolic stress, as occurs in hibernating animals. In the above situations, reproduction is totally dispensable or even incompatible with survival since, besides the high energetic cost required to maintain the fertility, pregnancy and nursing limit considerably the mobility for food seeking. In wildlife, animals are more dependent on seasonal fluctuations in food availability than their counterparts living under domestic conditions or humans. However, the increased prevalence in developed countries of metabolic pathologies (ranging from anorexia to obesity and metabolic syndrome) makes the study of the metabolic control of reproduction of special interest, in part due to economic reasons.
Concealed Quantum Information
Luis Roa
Physics , 2007,
Abstract: We study the teleportation scheme performed by means of a partially entangled pure state. We found that the information belonging to the quantum channel can be distributed into both the system of the transmitter and the system of the receiver. Thus, in order to complete the teleportation process it is required to perform an "unambiguous non-orthogonal quantum states discrimination" and an "extraction of the quantum information" processes. This general scheme allows one to design a strategy for concealing the unknown information of the teleported state. Besides, we showed that the teleportation and the "concealing the quantum information" process, can be probabilistically performed even though the bipartite quantum channel is maximally entangled.
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