1,721,265 research outputs found
Significación del Espacio Urbano en el Ciclo Franciscano de Asís
Full text linkFil: Corti, F. Universidad de Buenos Aires, Facultad de Filosofía y Letras, Instituto de Historia de las Artes "Julio E. Payró"; Argentina.Se analizan dos frescos del ciclo franciscano de la iglesia superior de Asís: "Homenaje en la plaza" y "Expulsión de los demonios de Arezzo", tratando de dilucidar la significación particular de los edificios en cada caso configuran el espacio urbano, y de establecer la relación de aquellos con las acciones que se desarrollan en dicho espacio
Significación del Espacio Urbano en el Ciclo Franciscano de Asís
Full text linkFil: Corti, F. Universidad de Buenos Aires, Facultad de Filosofía y Letras, Instituto de Historia de las Artes "Julio E. Payró"; Argentina.Se analizan dos frescos del ciclo franciscano de la iglesia superior de Asís: "Homenaje en la plaza" y "Expulsión de los demonios de Arezzo", tratando de dilucidar la significación particular de los edificios en cada caso configuran el espacio urbano, y de establecer la relación de aquellos con las acciones que se desarrollan en dicho espacio
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Editorial: Proteoglycans in the tumor microenvironment
Full text linkProteoglycans (PGs) are a family of heavily glycosylated proteins consisting of a core protein covalently attached to glycosaminoglycans (GAGs) and present in diverse environments, such as cell membrane surface, extracellular matrix, and intracellular granules. Extracellular proteoglycans play crucial roles in promoting cell signaling and migration by interaction with growth factor and/or their receptors, intracellular enzymes, extracellular ligands, matrix components, inflammatory cytokines, and structural proteins. Besides regulating the normal behavior and turnover of tissues, proteoglycans can also encourage tumor-microenvironment interactions via the same dysregulated pathways and facilitating metastasis, thus becoming important markers in cancer progression.
Proteoglycans play crucial roles in regulating tumor cell growth, proliferation, adhesion, metastasis, and angiogenesis. These functions are widely mediated through interaction between their GAGs chains and several bioactive proteins such as growth factors, morphogens, adhesion molecules, chemokines, and cytokines.
The main goal of this Research Topic will be to provide a better understanding of the functional role of proteoglycans in all the aspects of carcinogenesis. In particular, the topics can be focused in, but not restricted to, to some aspects still debated such as the presence of proteoglycans in extracellular vesicle shared between cancer and normal tissue; the correlation between hormones and proteoglycans metabolism; the roles of PGs in cell cycle; changes in GAG composition and their roles in tumor development; epigenetics events that can lead to PGs alterations
Effects of Control Strategies on AC-DC Conversion Efficiency in EV Wireless Charging
No full textIn this paper, the performance of an AC-DC rectifier for Electric Vehicle (EV) wireless charging operated under two different control strategies are compared. The first control technique results in a Zero Current Switching (ZCS) for the power switches and is named ZCS-C (Zero Current Switch Control), the second one does not allow this operation and is named NZCS-C. The two control strategies make the rectifier input equivalent impedance to be different. In detail the ZCS-C result in an equivalent impedance constituted by both an active and a reactive part, while the NZCS-C make the rectifier impedance to be only real and, therefore, the circulating current is lower in the latter. The effect of the equivalent impedance on the transmission efficiency and the effect of the operation in Zero Current Switching (ZCS) to the AC-DC conversion efficiency are evaluated. The control strategy which allows to operate at higher efficiency is identified
Frequency Analysis and Comparison of LCCL and CLLC Compensations for Capacitive Wireless Power Transfer
No full textIn this paper a comparison between a LCCL and CLLC resonant compensations for Capacitive Wireless Power Transfer (CWPT) system is presented. A review of several compensation topologies is presented. From this analysis emerges that these two topologies represent the more promising compensation for high power applications, such as Electric Vehicle (EV) wireless charging. The frequency behavior of each topology is analyzed studying the equivalent input impedance and the voltage transfer function. After design of each compensation to operate at optimum operating condition, the output power and the efficiency are evaluated under load, coupling parasitic resistances variations through LTspice simulations
Class-E Inverters for Capacitive Wireless Power Transfer in Charger Circuit Applications
No full textIn this paper a comparison between two Class-E inverter topologies for Capacitive Wireless Power Transfer (CWPT) application is presented. The first topology uses additional passive components to create an LC compensation and increase the transmission efficiency, while the second one directly exploits the capacitive coupling between the plates. An in-depth analysis of the output power and efficiency under variation of the coupling between plates is presented. Finally, the advantages and disadvantages of each topology are discussed
Mitochondria-Chloroplast Cross Talk: A Possible Role for Calcium and Reactive Oxygen Species?
No full textOne of the major challenges for plant biology research is to elucidate the complex mechanisms involved in the plant response to stress conditions. This is of utmost importance in view of climatic change that affects crop yields, because of exposure of plants to more severe and frequent environmental stresses such as drought, salinity, and high light. The defense response of the plants to stress conditions requires the orchestration among different signaling pathways activated in different subcellular compartments. An increasing knowledge became available about the role of bioenergetics organelles, the sites of energy conversion in eukaryotes by photosynthesis in chloroplasts and respiration in mitochondria. Information is mainly restricted to retrograde signaling between the organelles and the nucleus. The emerging hypothesis discussed in this minireview is that interorganellar cross talk between mitochondria and chloroplasts through Ca2+ and reactive oxygen species signaling may also play a role in ensuring an optimized response of plants and algae to environmental stresses
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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