Proceso de simbolización del concepto de potencia : análisis de libros de texto de secundaria

En este trabajo se presenta un estudio del desarrollo del sistema de signos del concepto de potencia en los libros de texto de matemáticas de educación secundaria obligatoria. Se analiza el tratamiento que los textos promueven de los contenidos conceptuales y procedimentales asociados a la idea de potencia. Para ello se seleccionan «dominios de actividad matemática» (Mamona-Downs y Downs, 2002) que caracterizan el concepto y se relacionan con las «etapas del proceso de abstracción» asociado al desarrollo de los signos matemáticos en el sentido que propone Socas (1997). El análisis permite identificar las características del concepto y la ausencia de aspectos relevantes del signifi cado de potencia que ponen de manifiesto los libros de texto analizados

Proceso de simbolización del concepto de potencia : análisis de libros de texto de secundaria

En este trabajo se presenta un estudio del desarrollo del sistema de signos del concepto de potencia en los libros de texto de matemáticas de educación secundaria obligatoria. Se analiza el tratamiento que los textos promueven de los contenidos conceptuales y procedimentales asociados a la idea de potencia. Para ello se seleccionan «dominios de actividad matemática» (Mamona-Downs y Downs, 2002) que caracterizan el concepto y se relacionan con las «etapas del proceso de abstracción» asociado al desarrollo de los signos matemáticos en el sentido que propone Socas (1997). El análisis permite identificar las características del concepto y la ausencia de aspectos relevantes del significado de potencia que ponen de manifiesto los libros de texto analizados.This paper studies the development of sign systems associated with the concept of power presented in secondary school Mathematics textbooks. The treatment that texts provide of the conceptual and procedural contents associated to the concept of power is analysed in this work. For this objective, we have selected «Mathematical activity domains» (Mamona-Downs & Downs, 2002) which characterizes the concept, connecting it with the development of abstraction process stages of mathematical signs as described by Socas (1997). This analysis allows us to identify features of the concept and the lack of relevant aspects of the meaning of the concept of powe

Vivir y morir en la Baeza moderna (1550-1650)

[ES]El presente estudio, analiza dos momentos fundamentales en la vida de toda persona . Por un lado, pretendemos conocer cómo vivió la sociedad baezana. Para ello, aspectos como el trabajo , el matrimonio y el papel que ejercieron las baezanas como eje vertebrador de los hijos y de la familia , serán importantes para conocer esa vida cotidiana .Por otro lado, estudiamos cómo se preparaban para morir y especialmente cómo veían y sentían la muerte los baezanos y baezanas . El testamento era el documento más importante que podemos utilizar ya que en él se mostraba no sólo las últimas voluntades , sino también sus preocupaciones , su estatus económico y sus creencias. De esta manera, las dos partes que componen este estudio mostrarán un aspecto que hasta ahora no se había analizado en el caso particular de Baeza: cómo vivió y cómo murió la sociedad baezana en la Edad Moderna.[EN]This study analyzes two important moments in the lite of every person. We want to know how Baezana society lived. For this reason, aspects like work , marriage and role of the Baezanas were the backbone of their children and their family.These aspects will be important to know their everyday lite. We study how they prepared to die and specially how Baezanos and Baezanas feel death. The testament is the most important document that we can use as it shows not only the last wills but also their worries, their economic status and their beliefs. In this way, the two parts of this study show an aspect that until now had not been analyzed in the case of Baeza: how he lived and how Baezana society died in the modern age.Tesis Univ. Jaén. Departamento de Antropología, Geografía e Historia. Leída el 18 de enero de 201

La novela virtual: intertextualidad y posmodernismo la cita Neobarroca

Tesis ( Maestría en Letras Españolas) U.A.N.L.UANLhttp://www.uanl.mx

Potential Protective Role Exerted by Secoiridoids from Olea europaea L. in Cancer, Cardiovascular, Neurodegenerative, Aging-Related, and Immunoinflammatory Diseases

Iridoids, which have beneficial health properties, include a wide group of cyclopentane [c] pyran monoterpenoids present in plants and insects. The cleavage of the cyclopentane ring leads to secoiridoids. Mainly, secoiridoids have shown a variety of pharmacological effects including anti-diabetic, antioxidant, anti-inflammatory, immunosuppressive, neuroprotective, anti-cancer, and anti-obesity, which increase the interest of studying these types of bioactive compounds in depth. Secoiridoids are thoroughly distributed in several families of plants such as Oleaceae, Valerianaceae, Gentianaceae and Pedialaceae, among others. Specifically, Olea europaea L. (Oleaceae) is rich in oleuropein (OL), dimethyl-OL, and ligstroside secoiridoids, and their hydrolysis derivatives are mostly OL-aglycone, oleocanthal (OLE), oleacein (OLA), elenolate, oleoside-11-methyl ester, elenoic acid, hydroxytyrosol (HTy), and tyrosol (Ty). These compounds have proved their efficacy in the management of diabetes, cardiovascular and neurodegenerative disorders, cancer, and viral and microbial infections. Particularly, the antioxidant, anti-inflammatory, and immunomodulatory properties of secoiridoids from the olive tree (Olea europaea L. (Oleaceae)) have been suggested as a potential application in a large number of inflammatory and reactive oxygen species (ROS)-mediated diseases. Thus, the purpose of this review is to summarize recent advances in the protective role of secoiridoids derived from the olive tree (preclinical studies and clinical trials) in diseases with an important pathogenic contribution of oxidative and peroxidative stress and damage, focusing on their plausible mechanisms of the action involved.España Ministerio de Economía y Competitivida

Antibacterial and Antibiofilm Activity of Methanolic Plant Extracts against Nosocomial Microorganisms

Biofilm is a complex microbial community highly resistant to antimicrobials.The formation of biofilms in biotic and abiotic surfaces is associated with high rates of morbidity and mortality in hospitalized patients. New alternatives for controlling infections have been proposed focusing on the therapeutic properties of medicinal plants and their antimicrobial effects. In the present study the antimicrobial and antibiofilm activities of 8 methanolic plant extracts were evaluated against clinical isolated microorganisms. Preliminary screening by diffusion well assay showed the antimicrobial activity of Prosopis laevigata, Opuntia ficus-indica, and Gutierrezia microcephala. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were determined ranging from 0.7 to >15 mg/mL. The specific biofilm formation index (SBF) was evaluated before and after the addition of plant extracts (MBC × 0.75). Opuntia ficus-indica caused the major reduction on SBF in dose-dependent manner. Cytotoxic activity of plant extracts was determined using brine shrimp lethality test (Artemia salina L.). Lethal Dose concentration (LD50 values) of the plant extracts was calculated. LD50 values for P. laevigata and G. microcephalawere 141.6 and 323.

Epigenetic linkage of systemic lupus erythematosus and nutrition

The term “epigenetics” refers to a series of meiotically/mitotically inheritable alterations in gene expression, related to environmental factors, without disruption on DNA sequences of bases. Recently, the pathophysiology of autoimmune diseases (ADs) has been closely linked to epigenetic modifications. Actually, epigenetic mechanisms can modulate gene expression or repression of targeted cells and tissues involved in autoimmune/inflammatory conditions acting as keys effectors in regulation of adaptive and innate responses. ADs, as systemic lupus erythematosus (SLE), a rare disease that still lacks effective treatment, is characterized by epigenetic marks in affected cells. Taking into account that epigenetic mechanisms have been proposed as a winning strategy in the search of new more specific and personalized therapeutics agents. Thus, pharmacology and pharmacoepigenetic studies about epigenetic regulations of ADs may provide novel individualized therapies. Focussing in possible implicated factors on development and predisposition of SLE, diet is feasibly one of the most important factors since it is linked directly to epigenetic alterations and these epigenetic changes may augment or diminish the risk of SLE. Nevertheless, several studies have guaranteed that dietary therapy could be a promise to SLE patients via prophylactic actions deprived of side effects of pharmacology, decreasing comorbidities and improving lifestyle of SLE sufferers. Herein, we review and discuss the cross-link between epigenetic mechanisms on SLE predisposition and development, as well as the influence of dietary factors on regulation epigenetic modifications that would eventually make a positive impact on SLE patients.Ministerio de Economía y Competitividad AG2017-89342-

Definición de un acuerdo de nivel de servicio que incorpore parámetros y métricas de QoS y QoE

Este artículo presenta la descripción del concepto básico de un SLA desde varias perspectivas y enfocado hacia servicios específicos. Del mismo modo se hará énfasis en otros conceptos igualmente importantes, como son la calidad de servicio (QoS) que hace referencia al rendimiento de la red de datos para un servicio especificado y la calidad de experiencia (QoE) que es la calidad percibida por el usuario final

The dilemmas of parental mediation: continuities from parenting in general

This article examines how much parent-child interactions around the online world reflect broader, more long-standing parent-child relations and parenting dilemmas. It does so through exploring the meanings that parents give to their parenting practices and the beliefs that underlie parental mediation their children's online activities as well as the reasons for any differences between their broader normative approach to parental mediation and their actual practices. Qualitative in-depth interviews conducted with 26 Spanish parents of children aged 9 to 16-years-old found that many parents favoured the managed progression of children towards more autonomy and gave reasons why it was important to trust older children. However, the analysis explores a range of dilemmas parents experience when trying to implement these ideals, where issues of privacy, trust and managing that progression all proved to be problematic

Antiurolithic activity of Berberis trifoliate extract on induced urolithiasis in rats by zinc disc implantation

Background: In clinical therapy, there is no satisfactory drug available for treatment of urolithiasis, especially for the prevention of their recurrence. The aim of this work was to evaluate in vivo antiurolithic activity of methanolic extract of Berberis trifoliata leaves.Material and methods: Urolithiasis was induced in Wistar rats by zinc disc implantation in urinary bladder. Upon postsurgical recovery, different doses of the methanolic extract of B. trifoliata leaves (50, 100 and 150 mg/kg body weight) were administered orally to zinc disc implanted rats for a period of 20 days. Antiurolithiatic activity was evaluated by measuring the difference between the weight of the implanted zinc discs at the time of implantation and the final weight of the dried calculi taken out from the bladder at the end of the 20 days period of treatment.Results: Extract of B. trifoliata significantly reduced calculi deposition around the implanted zinc disc at all doses (50, 100, and 150 mg/kg).Conclusion: Treatment with methanolic extract of B. trifoliata is useful agent against the kidney stone formation.Keywords: Antiurolithic, Berberis trifoliata, urolithiasis, zinc disc implantation