Institution
University of Extremadura
Education•Badajoz, Spain•
About: University of Extremadura is a education organization based out in Badajoz, Spain. It is known for research contribution in the topics: Population & Hyperspectral imaging. The organization has 7856 authors who have published 18299 publications receiving 396126 citations. The organization is also known as: Universidad de Extremadura.
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13 Jan 1996TL;DR: In this paper, the authors describe a research carried out with four student teachers of primary and secondary science education and compare their conceptions of the nature of science and learning and teaching of science with their classroom practice when teaching science lessons.
Abstract: The present article describes a research carried out with four student teachers of primary and secondary science education. The preservice teachers’ conceptions of the nature of science and learning and teaching of science were analyzed and compared with their classroom practice when teaching science lessons. Transfer of the conceptions to the classroom was not immediate and there was influence from other factors. Lastly the implications of the research for teacher education are discussed.
137 citations
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TL;DR: It is hypothesize that failures in innate immunity observed in frail elderly are related to those alterations described in adaptive immunity defined as the IRP, a predictor of mortality in elderly individuals that is based on several parameters of the adaptive immune response.
Abstract: Scientific and clinical advances in the last century have led to increased numbers of individuals living to older ages. Thus a major concern is how to live these years with a high quality of life. The ageing immune system is less well able to cope with infectious diseases than the youthful immune system probably as a consequence of altered immune response to pathogens. Thus, both innate and adaptive immune responses show age-related changes that could be decisive for healthy ageing and survival. Longitudinal studies in healthy elderly have allowed the definition of the ″immune risk phenotype” (IRP) a predictor of mortality in elderly individuals that is based on several parameters of the adaptive immune response. Here, we hypothesize that failures in innate immunity observed in frail elderly are related to those alterations described in adaptive immunity defined as the IRP. It will be important to include assays of NK cell markers and functions in future longitudinal studies in order to investigate this point in detail as well as to consider the trace element zinc as an essential co-factor for optimal NK cell activity.
137 citations
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TL;DR: In this article, the ozonation kinetics of oxalic acid in water in the presence of an activated carbon has been investigated at acid pH, and experimental results suggest that the reaction proceeds in the water phase between oxalric acid and oxidant species, likely hydroxyl radicals, coming from the ozone decomposition on the carbon surface.
Abstract: The ozonation kinetics of oxalic acid in water in the presence of an activated carbon has been investigated at acid pH. The presence of the activated carbon significantly enhances the degradation rate of oxalic acid if compared to single ozonation and single adsorption. According to total organic carbon measurements, nearly complete mineralization of oxalic acid can be achieved depending on the experimental conditions. The presence of tert-butyl alcohol, which scarcely adsorbs on the carbon surface at the conditions investigated, led to a significant reduction of the oxalic acid removal rate. Consequently, experimental results suggest that the reaction proceeds in the water phase between oxalic acid and oxidant species, likely hydroxyl radicals, coming from the ozone decomposition on the carbon surface. The proposed mechanism yielded a first-order kinetics with respect to ozone, close to the 0.8 order experimentally observed. Also, the energy of activation was found to be approximately 15 kcal mol-1.
137 citations
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University of Nottingham1, James Hutton Institute2, University of Dundee3, Ghent University4, University of Extremadura5, Utrecht University6, Oberlin College7, Centre de coopération internationale en recherche agronomique pour le développement8, University of Bonn9, Université catholique de Louvain10, University of Leeds11, Centre national de la recherche scientifique12, Kobe University13, Institut national de la recherche agronomique14, Forschungszentrum Jülich15, Institut de recherche pour le développement16, Duke University17
TL;DR: Comment on assays to describe lateral root phenotypes and proposed ways to move forward regarding the description of root system architecture are proposed, also considering crops and the environment.
Abstract: Roots are important to plants for a wide variety of processes, including nutrient and water uptake, anchoring and mechanical support, storage functions, and as the major interface between the plant and various biotic and abiotic factors in the soil environment. Therefore, understanding the development and architecture of roots holds potential for the manipulation of root traits to improve the productivity and sustainability of agricultural systems and to better understand and manage natural ecosystems. While lateral root development is a traceable process along the primary root and different stages can be found along this longitudinal axis of time and development, root system architecture is complex and difficult to quantify. Here, we comment on assays to describe lateral root phenotypes and propose ways to move forward regarding the description of root system architecture, also considering crops and the environment.
137 citations
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TL;DR: In this article, the authors study whether firms actually use RD, and they find that subsidies may be better suited than tax credits to encourage firms, especially knowledge-based firms, to start doing R&D.
Abstract: We study whether firms’ actual use of RD (2) one size may not fit all in innovation policy when the type or intensity of market failure differs across firm size, and (3) subsidies may be better suited than tax credits to encourage firms, especially young knowledge-based firms, to start doing R&D.
136 citations
Authors
Showing all 8001 results
Name | H-index | Papers | Citations |
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Russel J. Reiter | 169 | 1646 | 121010 |
Donald G. Truhlar | 165 | 1518 | 157965 |
Manel Esteller | 146 | 713 | 96429 |
David J. Williams | 107 | 2060 | 62440 |
Keijo Häkkinen | 99 | 421 | 31355 |
Robert H. Anderson | 97 | 1237 | 41250 |
Leif Bertilsson | 87 | 321 | 23933 |
Mario F. Fraga | 84 | 267 | 32957 |
YangQuan Chen | 84 | 1048 | 36543 |
Antonio Plaza | 79 | 631 | 29775 |
Robert D. Gibbons | 75 | 349 | 26330 |
Jocelyn Chanussot | 73 | 614 | 27949 |
Naresh Magan | 72 | 400 | 17511 |
Luis Puelles | 71 | 269 | 19858 |
Jun Li | 70 | 799 | 19510 |