25312 research outputs found
Sort by
Efecto de Aspergillus oryzae en la fermentación ruminal de una dieta de heno de alfalfa: concentrado con la utilización de la técnica de simulación de rumen (Rusitec)
Full text link[EN] Direct-fed microbial products have been shown to modify ruminal fermentation parameters and to have beneficial effects on ruminant performance. The aim of this study was to evaluate the effect of Aspergillus oryzae on ruminal fermentation of a 65:35 alfalfa hay:concentrate diet in continuous fermentation system Rusitec. Four fermenters corresponded to the control and four received 50 mg of A. oryzae lyophilized culture which was mixed with feed. Treatment with A. oryzae increase (p < 0.001 to p = 0.039) acetate, total short chain fatty acids (SCFA), minor SCFA production and acetate:propionate (Ac:Pr) ratio. A. oryzae addition decreased (p < 0.001) pH values and increased (p < 0.001) ammonia-N concentration. There were no differences among treatments in methane production (p = 0.230). The inclusion of A. oryzae did not affect (p = 0.386 to p = 0.865) the dry matter and fiber disappearance. Rumen fluid from A. oryzae fermenters did not affect (p=0.465 to p=0.938) gas production neither (p = 0.131 to p = 0.942) total SCFA from pure substrates. The increase of acetate, minor SCFA and total SCFA production indicate that A. oryzae strain stimulated rumen fermentation of a 65:35 alfalfa hay:concentrate diet in continuous fermentation system Rusitec.SILos autores desean agradecer el apoyo financiero recibido del MCYT de España (proyecto AGL2008- 04707-C02-02) y del MAE-AECID (Proyecto PCIIberoamérica A/4951/06). A. Sosa y A. Díaz agradecen haber recibido becas del MAEC-AECID
Linking the energy-emissions-water-food security nexus to the economic return of wheat production in Iran: A nutritional LCA approach
Full text link[EN] Wheat is a strategic crop of global importance, with a primary function of supplying calories and protein to meet human nutritional needs. In this regard, it is crucial to study the sustainability and the economic viability of this crop in order to improve food security. The central objective of this study is to examine the nexus between water, energy, emissions, food security and economic performance in wheat production (irrigated versus rainfed) in Iran. To this end, data from 96 farms in Gonbad-e Kavus (Golestan Province), collected via structured questionnaires and face-to-face interviews, were analyzed using a nutritional Life Cycle Assessment approach. An innovative set of eco-efficiency indicators was also applied to assess the energy–emissions–water–food security (EEWFs) nexus, explicitly integrating the economic and nutritional dimensions of wheat production. The analysis revealed substantial trade-offs among the various dimensions examined. Irrigated wheat was more profitable (24 % higher net margin per hectare) with a 21 % higher yield (4990 vs. 4109 kg/ha). However, this system increased non-renewable energy consumption by 55 % and tripled the water footprint (0.88 vs 0.29 m3/kg) (though it did not significantly raise the carbon footprint). Conversely, rainfed wheat showed higher resource efficiency, producing a threefold higher net margin per m3 of water used. By combining nutritional value with environmental productivity criteria, this study provides new insights and offers practical implications for technical, political, and economic planning in sustainable wheat production.S
Brain activity marks of logical validity: results from EEG and MEG studies
No full text[ES] Abstract. The objective of this research is to verify or refute the presence of specific cerebral electrical marks in logically valid inferences
Three-valued relevance logics
No full text[EN] The paper analyzes a subclass of non-classical relevance logics and proposes an axiomatization based on Belnap–Dunn semantics.Acknowledgement.Work supported by research project PID2020-116502GB-I00, financed by the Spanish Ministry of Science and Innovation (MCIN/AEI/10.13039/501100011033)
Formación del profesorado en competencias docentes en inclusión educativa
No full text[ES] Se presenta la investigación realizada durante dos años y medio en el programa
de Doctorado de Psicología Educativa y Ciencias de la Educación de la Universidad de León
por compendio de artículos. Se explicarán los resultados del primer estudio elaborado para el
primer artículo sobre una revisión sistemática sobre competencias docentes hacia la inclusión
educativa, se analizaron 61 publicaciones. El segundo artículo está en proceso de elaboración y
versa sobre un estudio comparativo entre el sistema educativo Italiano y el sistema educativo
Español en el ámbito de la inclusión educativa en las etapas de escolarización obligatoria sobre
el alumnado con necesidades educativas especiales, para ello, se seleccionaron dos dimensiones
para comparar, la organización de la escolarización y la formación inicial del profesorado. Por
último, para el tercer estudio se han establecido las bases para su elaboración centrándolas en
una investigación sobre la competencia de adaptación a las diferencias en una muestra amplia
de docentes, todavía no se ha iniciado.[EN] The research carried out during two and a half years in the Doctoral Programme
in Educational Psychology and Educational Sciences at the University of León is presented
in the form of a compendium of articles. The results of the first study elaborated for the first
article on a systematic review on teaching competences towards educational inclusion will be
explained. 61 publications were analysed. The second article is in the process of elaboration and
deals with a comparative study between the Italian and the Spanish educational systems in the
field of educational inclusion in the stages of compulsory schooling for students with special
educational needs, for which two dimensions were selected for comparison, the organisation
of schooling and initial teacher training. Finally, for the third study, the foundations for its
elaboration have been established, focusing on an investigation of the competence to adapt to
differences in a large sample of teachers, which has not yet been initiated
Estudio del tecnoestrés en docentes de Educación Superior
No full text[ES] El principal propósito de este trabajo incluído en la obra " Transformando la educación: una formación docente en TIC para un aprendizaje inclusivo y emocional" reside en caracterizar el tecnoestrés en el personal docente de la etapa de Educación Superior a través del análisis los artículos publicados en la base de datos Scopus
A Sexual Affiliation Network of Men Who Have Sex With Men Practicing Risk Sexual Behaviors and Chemsex: A Two‐Mode Approach
Full text linkOpen access funding provided by FEDER European Funds and the Junta De Castilla y León under the Research and Innovation Strategy for Smart Specialization (RIS3) of Castilla y León 2021-2027.[EN] Background: Dating apps for men who have sex with men (MSM) have facilitated unprotected sexual encounters and practices. In addition, drug use during such encounters is widespread among MSM. Traditionally, these populations have been studied in order to relate these facts to their socioeconomic characteristics and not from the perspective of the structure of their relationships, an aspect included in all nursing metaparadigms. Aim: Describe the structure of the MSM affiliation network and their dating apps. Methods: This was a descriptive cross-sectional study with 32 participants recruited online through the apps. The data used by this article come from the same sample and the same questionnaires as a previously conducted study; full details are provided in the Methods section. Results: MSM demonstrated varying degrees, engaging with 1–5 applications (normalized degree: 0.200–0.494), while venue popularity spanned from 1 to 32 (normalized degree: 0.031–0.500). The core of the network, including two applications and 16 central MSM units, exhibited a higher density, that is, a high number of connections (0.593), compared to the periphery (0.050), indicating significant centralization. Conclusion: The sexual affiliation network of MSM forms a cohesive, extensive network, with higher app usage affinity seen among individuals who use drugs, are from different birth countries, engage in group sex, or identify with nonhomosexual orientations.S
Plans spécifiques de formation pour de nouveaux enseignants pour l’enseignement online
Full text link[ES] Este capítulo, incluido en la obra "Formation des enseignants-chercheurs" se centra en las estrategias institucionales para la transformación digital y la mejora de la calidad docente, sirviendo como guía para la implementación de unidades de formación estables
Apuntes sobre las enfermedades del alma en la narrativa de Luis Mateo Díez
Full text link[ES] En relación con la obra de Luis Mateo Díez, se han analizado muchos resortes, elementos y asuntos, pero la riqueza de
su mundo literario multiplica siempre los cauces en los que sumergirnos para aprehender la completitud de su sentido.
En esta ocasión, he elegido una vertiente de aproximación a su narrativa que trata de ahondar, aunque sea en pocas páginas
y a través de unos sintéticos apuntes, en el protagonismo de algunas enfermedades del alma. Para ello, enfocaré la
atención, especialmente, en la melancolía que impregna su universo fabulador, un aspecto que puede parecer, en un
principio, de menor importancia que las entidades de voces narradoras, personajes y espacios, incluso que los temas que
desarrollan sus ficciones, pero que contribuye a la creación esencial de sus atmósferas
Desorption of rare earth elements (REEs) from schwertmannite under acid mine drainage (AMD) and AMD-seawater conditions
Full text link[EN] Schwertmannite as a sink for rare earth elements (REEs) in environments affected by acid mine drainage (AMD)
plays a significant role in the fate of these elements. The conditions to precipitate schwertmannite (i.e., sulfate-
rich water and pH between 2.5 and 3.5) are not suitable for this Fe-oxyhydroxysulfate (Fe8O8(OH)6SO4) to
adsorb REEs. In estuaries where AMD-impacted rivers meet (e.g. the Odiel and the Tinto rivers in the Ría de
Huelva estuary in SW Spain), AMD mixes with seawater raising the pH between 4.5 and 8, thereby enabling REE
adsorption on schwertmannite at circumneutral pH. However, the estuarine tidal dynamics exposes REE-
enriched schwertmannite to more acidic water, inducing REE desorption, which has yet to be studied.
In the present work, batch experiments were performed to study the REE desorption from a REE-enriched
schwertmannite within the pH range 4.5–7 in the presence of sulfate at room temperature. Solution-chemistry
data were used to obtain the REE desorption surface constants from different surface complexation. Desorp-
tion of a Lu-enriched schwertmannite at different pH was investigated with High Energy X-Ray Diffraction
(HEXD) and Extended X-ray Adsorption Fine Structure (EXAFS) to characterize the changes in the surface
complexes during desorption. The results indicate that (1) REEs desorb from schwertmannite at pH < 6 and
desorption is pH dependent, (2) desorption of light REEs is higher than that of heavy REEs, (3) REE sorption onto
schwertmannite surface is not a totally reversible reaction, and that (4) both monodentate and bidentate surface
complexes are involved in the Lu-desorption reaction. These observations indicate that (1) REE-enriched
schwertmannite remains stable in the areas of the estuary nearer the sea and that (2) tidal fluctuations
displace schwertmannite colloids towards areas that are more affected by AMD, inducing REE desorption from
schwertmanniteS