Fuentes primarias, objetos y artefactos en la interpretación de la historia. Diseño y evaluación de un taller de numismática en Educación Secundaria

Este trabajo presenta el diseño y evaluación de una experiencia de innovación para la enseñanza de la historia, basada en el uso de un taller de numismática en la unidad didáctica sobre el Antiguo Régimen. Se incide principalmente en los aspectos metodológicos de la experiencia, y en el uso de diferentes fuentes para desarrollar la interpretación y argumentación histórica en el alumnado. La experiencia se realizó en tres cursos consecutivos. La valoración de la experiencia se realizó a través de un cuestionario cerrado con una escala de estimación tipo Likert (1-5), donde el alumnado debía valorar tanto la actividad, como el proceso de enseñanza y el aprendizaje adquirido. Los resultados fueron positivos a lo largo de los tres años.This paper presents the design and evaluation of an innovative experience to teach history based on the use of a numismatic workshop in the teaching unit on the Old Regime. We deepen mainly on methodological aspects of the experience, and the use of different sources to develop the interpretation and historical argument in students. The experience was carried out in three consecutive courses. The assessment of the experience was carried out through a closed questionnaire with a Likert scale (1-5), where students should assess both the activity and the process of teaching and learning acquired. The results were positive over the three years

Leptogenesis, Z' bosons, and the reheating temperature of the Universe

We study the impact for leptogenesis of new U(1) gauge bosons coupled to the heavy Majorana neutrinos. They can significantly enhance the efficiency of thermal scenarios in the weak washout regime as long as the Z' masses are not much larger than the reheating temperature ($M_{Z'}<10 T_{rh}$), with the highest efficiencies obtained for Z' bosons considerably heavier than the heavy neutrinos ($M_{Z'} > 100 M_1$). We show how the allowed region of the parameter space is modified in the presence of a Z' and we also obtain the minimum reheating temperature that is required for these models to be successful.Comment: 14 pages, 6 figures; One figure added, discussion on the reheating temperature extende

Las complicaciones de la resonancia magnética nuclear en la exploración de la articulación temporomandibular

La presencia de ciertos materiales ferromagnéticos , implantes y aparatos metálicos en el organismo se considera una contraindicación relativa para la práctica de una resonancia magnética nuclear, debido a los riesgos asociados al desplazamiento o dislocación de los mismos al ser atraídos en el campo magnético a que se les somete. Se presenta un resumen sobre los materiales con un riesgo potencial de complicaciones durante la práctica de la resonancia magnética nuclear de la articulación temporomandibular y se destaca la importancia de la detección previa de los mismos mediante la anamnesis y la exploración fisica de los pacientes que precisan dicha técnica. En algunos casos, se precisará asesoramiento especializado

Complete CKM quark mixing via dimensional deconstruction

It is shown that the deconstruction of $[SU(2)\times U(1)]^N$ into $[SU(2)\times U(1)]$ is capable of providing all necessary ingredients to completely impliment the complex CKM mixing of quark flavors. The hierarchical structure of quark masses originates from the difference in the deconstructed chiral zero-mode distribution in theory space, while the CP-violating phase comes from the genuinely complex vacuum expectation value of link fields. The mixing is constructed in a specific model to satisfy experimental bounds on quarks' masses and CP violation.Comment: RevTex4, 25 pages, typos in section IIC corrected, published versio

Estilos arquitectónicos y estadios constructivos en el grupo May, Oxkintok, Yucatán.

Sin resume

Inverted ductal papilloma of the oral cavity secondary to lower lip trauma: a case report and literature review

Inverted ductal papilloma of the oral cavity is an infrequent benign neoplasm of papillary appearance that originates in the secretory duct of a salivary gland. The etiology is unknown, though some authors have related it to human papillomavirus (HPV) infection. We present the case of a 40-year-old woman with a tumor of the lower lip mucosa. Histopathological study of the lesion diagnosed inverted ductal papilloma of the oral cavity. Human papillomavi - rus DNA detection and typing based on tumor lesion DNA amplification and posterior hybridization, revealed no presence of viral DNA. The antecedents of trauma reported by the patient could have played an important role in the development of this tumor

Avaliação da eficiência de diferentes produtos enológicos na remoção de ocratoxina A de vinho

As micotoxinas são metabolitos secundários tóxicos produzidos por certos fungos, sendo a ocratoxina A (OTA) das mais importantes. A presença de OTA nos vinhos pode constituir um risco para a saúde dos consumidores, sendo por isso aconselhado que se tomem medidas para atingir níveis seguros para o consumo humano [1]. De acordo com o Regulamento n.º 1881/2006 da Comissão Europeia, o limite máximo para a OTA em vinho é de 2 µg/kg [2]. Sendo assim, foi objetivo deste trabalho conhecer a eficiência de diferentes produtos enológicos na remoção de OTA de vinhos, bem como o seu impacto nas suas características organoléticas. Foram testados onze produtos enológicos diferentes, com origem mineral, sintética, microbiana, vegetal e animal, de forma a avaliar a sua eficiência na remoção de OTA de vinhos. Os ensaios foram realizados em vinhos artificialmente suplementados com OTA numa concentração final de 10 µg/L. O produto enológico mais eficiente na remoção de OTA do vinho branco (80%) é composto por gelatina, bentonite e carvão ativado. Reduções entre 10-30% foram também obtidas com o caseinato de potássio, paredes de células de levedura e proteína de ervilha. Com a aplicação de bentonite, carboximetilcelulose, polivinilpolipirrolidona e quitosana não se verificou nenhuma remoção considerável de OTA dos vinhos brancos. Estes resultados podem fornecer informações úteis para os produtores de vinho, ajudando-os na seleção do produto enológico mais adequado para a remoção de OTA de vinhos brancos, reduzindo a toxicidade do vinho e melhorando simultaneamente a segurança alimentar e qualidade do produto final.Agradecimentos: Este trabalho foi financiado por fundos FEDER através do Programa Operacional Factores de Competitividade - COMPETE e por fundos nacionais através da Fundação para a Ciência e a Tecnologia -FCT, ref. FCOMP-01-0124-FEDER-028029 e PTDC/AGR-TEC/3900/2012, respetivamente. Luís Abrunhosa recebeu apoio através da bolsa Incentivo/EQB/LA0023/2014 do ON.2 O Novo Norte

Treatment of oral mucocele - scalpel versus CO2 laser

Objective: To compare the results obtained after oral mucocele resection with the scalpel versus the CO2 laser, based on the complications and recurrences after surgery Patients and Methods: Of the 68 patients we studied who have mucocele, 38 were resected with a scalpel and the remaining 30 with the CO2 laser (5-7 W). Patient sex and age were documented, along with location of the lesion as well as size, symptoms, duration, etiological factors, type of treatment, complications and recurrences after surgical removal. Results: The sample comprised 40 males and 28 females, aged between 6-65 years. The histological diagnosis was extravasation mucocele in 95% of the cases. The most frequent location was the lower lip (73.5%). The mean lesion diameter was 9 mm , and in most cases no evident etiological factor was recorded. The mean duration of the lesion was 4 months. Among the cases of conventional surgical removal of mucocele, recurrence was recorded in 8.8% of the cases, and 13.2% of the patients suffered postoperative complications - the most frequent being the presence of fibrous scars. There were no complications or relapses after a minimum follow-up of 12 months in the cases subjected to CO2 laser treatment. Conclusions: Oral mucocele ablation with the CO2 laser offers more predictable results and fewer complications and recurrences than conventional resection with the scalpe