University of Extremadura
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Topics, methods and research results on TikTok/Instagram and reading. Bibliographic reviewistemática bibliográfica
No full textLos estudios sobre redes sociales y lectura, como los de Sorensen; Mara, 2013; Jeffman, 2015; Hughes, 2017; Cruces, 2017; Lluch, 2021 o Amo Sánchez-Fortún, 2021, centran su atención en los blogs y en YouTube como espacios en los que se crea contenido relacionado con la lectura. Esta revisión sistemática pretende conocer, sintetizar y valorar el estado de la investigación sobre Instagram y TikTok donde se habla, se recomiendan o venden libros, evaluando la calidad de los estudios mediante la lista de verificación del CASPe. Con este objetivo, se han realizado búsquedas en las bases de datos SCOPUS, WOS, LISA, LISTA y en el buscador especializado Google Scholar. La búsqueda ha identificado 1006 registros; después del cribado, se incluyeron artículos científicos, trabajos de investigación y académicos sobre libros, lectura, Instagram y TikTok. Finalmente, el corpus de la revisión lo forman 66 documentos, en su mayoría, de España y EE.UU. Dependiendo del tipo de documento y de la base de datos, la investigación mayoritaria quiere conocer 1) cómo son los administradores de las cuentas, 2) qué tipo de contenido comparten y con qué forma; 3) qué uso hacen los bibliotecarios, las editoriales y las librerías.Previous studies on social networks and reading, such as those by Sorensen; Mara, 2013; Jeffman, 2015; Hughes, 2017; Cruces, 2017; Lluch, 2021 o Amo Sánchez-Fortún 2021 focus their attention on blogs and YouTube as spaces in which content related to reading is created. This systematic review aims to know, synthesize and assess the research on the last two social networks, Instagram and TikTok, where readers, authors, companies and institutions speak, recommend or sell books. With this objective, searches have been carried out in the SCOPUS, WOS, LISA, and LISTA databases and in the specialized search engine Google Scholar. The search has identified 1006 records; after screening, scientific articles, research papers, and academics dealing with books, reading, Instagram, and TikTok from different approaches were included, and the quality of the studies was assessed using the CASPe checklist. Finally, the corpus of the review has been made up of 66 documents that come, for the most part, from Spain and the US; they began to be published in 2016 and belong mainly to the areas of communication and journalism and libraries. Depending on the type of document and the database, the majority line of research wants to know 1) what the account administrators are like, 2) what kind of content they share and how; 3) what librarians use and how publishers and bookstores use them.Artículo elaborado en el marco del proyecto de investigación «El canon literario no académico: construcción, características, responsables, selección y recepción en los epitextos públicos virtuales» PID2019-10587RB-I00. Proyectos de I+D+i en el marco de los Programas Estatales generación de conocimiento y fortalecimiento científico y tecnológico del sistema de I+D+i Orientada a los Retos de la Sociedad. Ministerio de Ciencia e innovación de España. Convocatoria 2019peerReviewe
La involucración y aprendizaje en la enseñanza del balonmano: Una experiencia pedagógica con alumnos de secundaria
No full textA inadequação das instalações desportivas nas escolas é uma realidade que afeta negativamente a Educação Física, nomeadamente o ensino dos jogos desportivos. Esta experiência pedagógica decorreu em contexto de estágio profissional cujo propósito foi analisar o valor formativo de tarefas observacionais e da heteroavaliação na participação e envolvimento dos alunos numa unidade de ensino de andebol lecionada sob a égide do modelo de competência dos jogos de invasão, em espaços reduzidos. A experiencia decorreu no segundo semestre do ano letivo 2022/2023, em 11 tempos letivos, numa turma do 11º ano de escolaridade constituída por vinte sete alunos. O diário de bordo da estudanteestagiária, os registos observacionais dos alunos e o grupo focal com os alunos no final da intervenção foram as fontes de dados. O conteúdo informativo dos diversos instrumentos foi analisado recorrendo a procedimentos de análise temática do conteúdo. Os resultados evidenciam que o ensino centrado nos problemas de jogo, associado às tarefas observacionais e de heteroavaliação, permitiram envolver todos os alunos na aula e promoveram a aprendizagem ao nível da competência motora, do entendimento do jogo e dos elementos organizativos e regulamentares das competições de andebol. Os alunos valorizaram a experiência, principalmente os processos de observação e de heteroavaliação.The inadequacy of sports facilities in schools significantly impacts Physical Education (PE), particularly the teaching of sports games. This pedagogical experience took place in the context of a school placement whose purpose was to analyze the formative value of observational tasks and peer-assessment in the participation and involvement of students in a handball teaching unit taught under the aegis of the competence model of invasion games in reduced spaces. The experience occurred during the second semester of the 2022/2023 academic year, spanning 11 PE classes with twenty-seven 11th-grade students. Data sources included the preservice teacher logbook, student observational records, and a focus group with students conducted at the intervention's conclusion. Thematic content analysis procedures were employed to analyze the informative content of the various instruments. Results indicate that teaching focused on game problems, along with observational and peerassessment tasks, facilitated the involvement of all students in the class and promoted learning. This learning encompassed motor skills development, comprehension of game dynamics, and understanding of handball competition organization and rules. Students expressed appreciation for the experience, particularly highlighting the observation and peerassessment processes.La inadecuación de instalaciones deportivas en las escuelas impacta en la Educación Física, especialmente en la enseñanza de los juegos deportivos. Esta experiencia pedagógica tuvo lugar en una práctica escolar cuyo propósito fue analizar el valor formativo de las tareas de observación y la hetero-evaluación en la participación e involucramiento de los estudiantes en una unidad de enseñanza de balonmano impartida bajo el modelo de competencia de juegos de invasión en espacios reducidos. La experiencia tuvo lugar durante el segundo semestre del año académico 2022/2023, abarcando 11 clases de Educación Física con veintisiete estudiantes de 11º grado. Los datos incluyeron el cuaderno de registro del profesor en formación, los registros observacionales y un grupo focal con los estudiantes al concluir la intervención. Los datos se analizaron mediante un análisis de contenido temático. Los resultados indican que la enseñanza centrada en los problemas del juego, junto con las tareas de observación y hetero-evaluación, facilitó la participación de los estudiantes y promovió el aprendizaje. Este aprendizaje abarcó el desarrollo de habilidades motoras, la comprensión de la dinámica del juego y la comprensión de la organización y reglas de competencia del balonmano. Los estudiantes disfrutaron de la experiencia, destacando la observación y hetero-evaluación.peerReviewe
Electronic Prediction of Chemical Contaminants in Aroma of Brewed Roasted Coffee and Quantification of Acrylamide Levels
No full textEl objetivo de esta investigación fue aplicar un dispositivo electrónico como tecnología predictiva indirecta para evaluar compuestos químicos tóxicos en café espresso tostado. Los granos de café frescos fueron sometidos a diferentes tratamientos térmicos y analizados para determinar compuestos orgánicos volátiles, contenido de acrilamida y 5-hidroximetilfurfural, características sensoriales y datos de la nariz electrónica. En total, se detectaron 70 compuestos volátiles diferentes y se agruparon en 15 familias químicas. El mayor porcentaje de estos compuestos fueron furanos, pirazinas, piridinas y aldehídos. El aroma positivo detectado tenía la intensidad del olor a café y un aroma tostado, mientras que el aroma negativo estaba relacionado con un olor a quemado. Se estableció una relación lineal entre las sustancias tóxicas y el defecto sensorial. Un alto defecto sensorial implicaba un menor contenido de acrilamida y un mayor contenido de 5-hidroximetilfurfural. Finalmente, las señales electrónicas también se correlacionaron con el defecto sensorial. Esta relación nos permitió predecir la presencia de estos contaminantes en la bebida de café tostado con un método indirecto utilizando este dispositivo electrónico. Por lo tanto, este dispositivo puede ser útil para evaluar indirectamente los contaminantes químicos en las bebidas de café según sus características sensoriales.The aim of this research was to apply an electronic device as indirect predictive technology to evaluate toxic chemical compounds in roasted espresso coffee. Fresh coffee beans were subjected to different thermal treatments and analyzed to determine volatile organic compounds, content of acrylamide and 5-hydroxymethylfurfural, sensory characteristics and electronic nose data. In total, 70 different volatile compounds were detected and grouped into 15 chemical families. The greatest percentage of these compounds were furans, pyrazines, pyridines and aldehydes. The positive aroma detected had the intensity of coffee odor and a roasted aroma, whereas the negative aroma was related to a burnt smell. A linear relationship between the toxic substances and the sensory defect was established. A high sensory defect implied a lower content of acrylamide and a higher content of 5-hydroxymethylfurfural. Finally, electronic signals were also correlated with the sensory defect. This relationship allowed us to predict the presence of these contaminants in the roasted coffee beverage with an indirect method by using this electronic device. Thus, this device may be useful to indirectly evaluate the chemical contaminants in coffee beverages according to their sensory characteristics.This research was funded by the National University of Agriculture (Honduras), the local government of Extremadura (ref. GR21121—AGA008) and the European Regional Development Fund (FEDER).peerReviewe
The organizational impact in Kibs companies of certain digital marketing factors: digital capabilities and internet technologies
No full textVersión aceptada del artículo publicado en Journal of Marketing Analytics (2024). https://doi.org/10.1057/s41270-024-00322-1The concept of digital marketing is currently fragmented due to the emergence of many sub-areas of research. This is moti-vated by the evolution of markets that believe in the widespread adoption of digital technologies and online social networks. These changes generate turbulent environments. However, companies have not evolved uniformly, and there is a dearth of research, results, and conclusions for small businesses to compete with more objective, relational, and interactive marketing techniques. This paper aims to explore the relationship between dynamic capabilities, social media, and cloud computing in the context of digital marketing, based on resource and capability theory. It also develops and validates a measurement scale for digital marketing in knowledge-intensive business services (KIBS) companies with knowledge management business strategies. The study used an exploratory factor analysis (EFA) to identify underlying factors, followed by a confirmatory factor analysis (CFA) to validate the model. The dataset used for this analysis was collected through an online survey of 335 KIBS owners in Spain. An innovative and perfectly adapted conceptualisation of digital marketing for KIBS is presented. Specifically, digital marketing capabilities (DMC) with a holistic perspective are aligned with social networks and cloud technology. These factors optimise knowledge management through their absorptive capacity and increase the efficiency of their business operations via the proper implementation of operational capabilities.peerReviewe
Machine Learning Applied to Tourism: A Systematic Review
No full textThe application of machine learning techniques in the field of tourism is experiencing a remarkable growth, as they allow to propose efficient solutions to problems present in this sector, by means of an intelligent analysis of data in their specific context. The increase of work in this field requires an exhaustive analysis through a quantitative approach of research activity, contributing to a deeper understanding of the progress of this field. Thus, different approaches in the field of tourism will be analyzed, such as planning, forecasting, recommendation, prevention, and security, among others. As a result of this analysis, among other findings, the greater impact of supervised learning in the field of tourism, and more specifically those techniques based on neural networks, has been confirmed. The results of this study would allow researchers not only to have the most up-to-date and accurate overview of the application of machine learning in tourism, but also to identify the most appropriate techniques to apply to their domain of interest, as well as other similar approaches with which to compare their own solutions.This work was supported by the AEI (State Research Agency, Spain), the MICIU (Ministry of Science, Innovation and Universities, Spain), and the ERDF (European Regional Development Fund, EU), as part of the project PID2022-137275NA-I00 (X-BIO project) funded by MICIU/AEI/10.13039/501100011033 and by ERDF, EU.peerReviewe
La nueva cotización al régimen especial de trabajadores autónomos y su contraste con las mutualidades alternativas
No full textLa aprobación del Real Decreto-ley 13/2022, de 26 de julio, por el que se establece un nuevo sistema de cotización para los trabajadores por cuenta propia o autónomos y se mejora la protección por cese de actividad, pretende acercar las bases de cotización a las rentas reales de los trabajadores autónomos, lo que viene a suponer un giro radical en el modelo de cotización de éstos, el cual permanecía desvinculado de los ingresos obtenidos por el ejercicio de la actividad profesional. El legislador afronta esta reforma normativa con el claro objetivo de aproximar la cotización del Régimen Especial de Trabajadores Autónomos a la cotización del Régimen General. Además, la reforma supone la equiparación de la legislación española a los modelos existentes en otros Estados europeos.
La presente obra expone pormenorizadamente este nuevo sistema de cotización aplicable a los trabajadores autónomos y pretende resolver las dudas interpretativas que se vienen generando en la aplicación de este nuevo modelo, abordando, específicamente, los elementos fundamentales que configuran este nuevo sistema de cotización y el contraste de este con las mutualidades alternativas de previsión social para algunas profesiones colegiadas. Finalmente, se analizan algunos otros modelos de cotización existentes para los trabajadores autónomos en diferentes Estados europeos, al objeto de obtener una visión global sobre el estado de esta cuestión
Desarrollo de estrategias basadas en levaduras antagonistas para el control de hongos alterantes en alimentos de origen vegetal y animal
No full textPrograma de Doctorado en Ciencia de los AlimentosEntre las principales causas que acortan la vida útil de los alimentos destaca el desarrollo de múltiples especies fúngicas que alteran y pueden representar además un riesgo sanitario. Para su control, el enfoque actual de implementar en la cadena alimentaria tecnologías que mejoren la sostenibilidad de los sistemas ha permitido el desarrollo de estrategias de control biológico mediante microorganismos antagonistas. En este sentido, esta Tesis Doctoral explora el empleo de levaduras antagonistas como nueva alternativa para el control de las alteraciones fúngicas en frutas y quesos. Para ello se han aislado, identificado y caracterizado levaduras antagonistas y mohos causantes de alteración procedentes de frutas y quesos. Las pruebas in vitro han permitido identificar varias levaduras con antagonismo asociado a la producción de compuestos orgánicos volátiles, competición por espacio y nutrientes, producción de enzimas líticas, parasitismo, etc., así como modelizar su comportamiento en las condiciones ambientales de aplicación. En frutas, la aplicación de Zygoascus meyerae L29 y Pichia kudriavzevii PK18 permitió el control de podredumbres en uvas por Penicillium glabrum. Además, P. kudriavzevii PK18 y Metschnikowia pulcherrima L672 aumentaron la vida útil de cerezas en sistemas de atmósferas controladas. En quesos, Pichia jadinii PJ433 demostró su eficacia en el control de alteraciones causadas por diferentes mohos en la corteza, mientras que Debaryomyces hansenii DH1249 limitaba la pigmentación rosa asociada a Yarrowia lipolytica. Estos resultados ponen de manifiesto la idoneidad de las levaduras autóctonas antagonistas como método sostenible para el control de alteraciones fúngicas en productos de origen vegetal y animal.Among the main causes that shorten the shelf life of food is the development of multiple fungal species that spoil and can also represent a health risk. To control them, the current focus on implementing technologies in the food chain that improve the sustainability of the systems has allowed the development of biological control strategies using antagonistic microorganisms. In this sense, this PhD explores the use of antagonistic yeasts as a new alternative for the control of fungal alterations in fruits and cheeses. For this purpose, antagonistic yeasts and moulds from fruits and cheeses have been isolated, identified, and characterised. In vitro tests have identified several yeasts with antagonism associated with the production of volatile organic compounds, competition for space and nutrients, production of lytic enzymes, parasitism, etc., as well as modelling their behaviour under the environmental conditions of application. In fruits, the application of Zygoascus meyerae L29 and Pichia kudriavzevii PK18 allowed the control of Penicillium glabrum rots in grapes. In addition, P. kudriavzevii PK18 and Metschnikowia pulcherrima L672 increased the shelf life of cherries in controlled atmosphere systems. In cheeses, Pichia jadinii PJ433 proved effective in controlling alterations caused by different moulds on the rind, while Debaryomyces hansenii DH1249 limited pink pigmentation associated with Yarrowia lipolytica. These results demonstrate the suitability of indigenous yeast antagonists as a sustainable method for the control of fungal spoilage in plant and animal products.Junta de Extremadura y de la Agencia Estatal de Investigación, IB16038 y RTI2018-096882-B10
About mulejas, cachelos, cebollejas and other coseja: fuctionning and distributions of - Ejo as appreciative suffix in Spain
No full textEste trabajo tiene por objetivo delimitar la extensión y el funcionamiento del sufijo - ejo como apreciativo en España. Dado que se trata de un uso dialectal, se realizará una revisión de obras prescriptivas y de la nomenclatura toponímica española para analizar su trayectoria diacrónica. A partir de los datos de los atlas y corpus lingüísticos y de twitter, se fijará su distribución geográfica y semántica, y su alomorfia. Por último, en vista de que en La Mancha se usa de forma más frecuente, se examinará su relación con el sufijo -ete, con el que parece estar en distribución complementaria.The aim of this work is to delimit the extension and functioning of -ejo as an appreciative suffix in Spain. Since it involves a dialectal use, a review of prescriptive works and of works about the Spanish toponymic nomenclature will be carried out in order to analyze its diachronic trajectory. Using data from linguistic atlases and corpora, and from
X/Twitter, its geographical and semantic distribution and its allomorphy will be established. Finally, given that it is more frequently used in La Mancha, its relationship with.peerReviewe
Prognostic value of bioelectrical impedance analysis in head and neck cancer patients undergoing radiotherapy: a VALOR® study
No full textINTRODUCTION: Bioelectrical impedance analysis (BIA) serves as a method to estimate body composition. Parameters such as phase angle (PA), standardized phase angle (SPA), body mass cell (BCM), BCM index (BCMI), and fat-free mass (FFM) might significantly impact the prognosis of head and neck cancer (HNC) patients. The present study aimed to investigate whether bioelectrical parameters can be used to predict survival in the HNC population and establish the optimal cutoff points for predictive accuracy.
METHODS: A multicenter observational study was performed across 12 tertiary hospitals in Andalusia (a region from the south of Spain). A total of 494 patients diagnosed with HNC between 2020 and 2022 at different stages were included in this study, with a minimum follow-up period of 12 months. The BIA assessment was carried out during the first 2 weeks of radical radiotherapy treatment with chemotherapy or other systemic treatments. A multivariate logistic regression analysis of overall survival, complications, hospital admission, and palliative care and its relationship with BIA nutritional assessment was performed.
RESULTS: Significant prognostic factors identified in the multivariable analysis encompassed phase angle (PA), standardized phase angle (SPA), body cell mass (BCM), and BCM index (BCMI). Lower PA and BCM values were significantly associated with adverse clinical outcomes. A BCM threshold above 17 kg/m2 was the most significant predictor for predicting survival within the overall HNC population. The PA values of <5.1° in male and <4.8° in female patients showed the best predictive potential for mortality. Increased PA (as a continuous variable) demonstrated a significantly reduced risk for mortality (OR, 0.64; 95% CI, 0.43-0.94; p < 0.05) and a decreased likelihood of hospital admission (OR, 0.75; 95% CI, 0.52-1.07; p < 0.05). Higher BCM correlated with a lower risk of mortality (OR, 0.88; 95% CI, 0.80-0.96; p < 0.01) and a diminished probability of hospital admission (OR, 0.91; 95% CI, 0.83-0.99; p < 0.05).
CONCLUSION: BIA is a crucial tool in the nutritional assessment of HNC patients. BCM and PA are the main bioelectrical parameters used to predict clinical outcomes in this population. Future studies are needed to validate BIA variables in a large cohort to ensure whether early intensification of nutritional treatment would improve survival.The author(s) declare financial support was received for the research, authorship, and/or publication of this article. This research was funded by FRESENEIUS KABI. The APC was funded by FRESENIUS KABI. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript; or in the decision to publish the results.peerReviewe
Longitudinal analysis of the effect of sedentary behaviour on body composition, physical condition, and academic performance in preadolescents and adolescents
No full textEl objetivo de este estudio fue determinar los efectos que tiene el sedentarismo en la composición corporal, condición física y rendimiento académico a lo largo de las etapas de Educación Primaria y Secundaria. La muestra incluyó 70 niños evaluados durante 5 años. Se obtuvieron datos de composición corporal (Índice de Masa Corporal, Índice de Cintura Cadera, % de grasa corporal y % de masa muscular), condición física (salto de longitud, salto de altura, Test de agilidad o Test de Tapping, Test de Cooper, presión manual) y rendimiento académico en cada asignatura cursada en ambas etapas educativas. Los resultados mostraron que a mayor edad existe un mayor número de alumnado con comportamiento sedentario, un empeoramiento de la condición física y, además, el rendimiento académico se ve afectado por estos comportamientos sedentarios y la inactividad física.The aim of this study was to determine the effects of sedentary lifestyles on body composition, physical function and academic performance throughout primary and secondary school. The sample included 70 children assessed over 5 years. Data were obtained on body composition (Body Mass Index, Waist Hip Index, % body fat and % muscle mass), physical performance (long jump, high jump, agility test or Tapping Test, Cooper Test, manual pressure) and academic performance in each subject studied in both educational stages. The results showed that the older the age, the higher the number of students with sedentary behaviour, the worse the physical condition, and also the academic performance is affected by these sedentary behaviours and physical inactivity.O objetivo deste estudo foi determinar os efeitos dos estilos de vida sedentários na composição corporal, na função física e no desempenho académico ao longo do ensino básico e secundário. A amostra incluiu 70 crianças avaliadas ao longo de 5 anos. Foram obtidos dados sobre a composição corporal (índice de massa corporal, índice cintura-quadril, % de gordura corporal e % de massa muscular), o desempenho físico (salto em comprimento, salto em altura, teste de agilidade ou Tapping Test, teste de Cooper, pressão manual) e o desempenho académico de cada sujeito estudado em ambas as fases de ensino. Os resultados mostraram que quanto maior a idade, maior o número de alunos com comportamentos sedentários, pior a condição física e também o desempenho académico é afetado por estes comportamentos sedentários e pela inatividade física.peerReviewe