567 research outputs found
Renewing Steiner Teacher Education: A Conversation With Florian Osswald
No full textThis article contains an interview between the author and Florian Osswald, one of the co-leaders of the Steiner education movement worldwide, held at the end of the four-day Asian Steiner Teacher Educators’ Conference in Yuchi, Taiwan in February, 2020. It focuses on the work of the International Teacher Education Project (ITEP), an initiative set up by Osswald in 2017; the aim of ITEP is the renewal of Steiner teacher education worldwide, through a process of long-term engagement with teacher educators around the world. The interview covers the consultative process Osswald has chosen for ITEP and indicates how a century-old, globally distributed, spiritually based educational movement is looking to maintain that relevance. It gives insight into the current status of Steiner teacher education and some indications of directions in which it might develop further
Photoinduced Processes in Self-Assembled Porphyrin/Perylene Bisimide Metallosupramolecular Boxes
No full textPlayer agency in interactive narrative: audience, actor & author
No full textThe question motivating this review paper is, how can
computer-based interactive narrative be used as a constructivist learn-
ing activity? The paper proposes that player agency can be used to
link interactive narrative to learner agency in constructivist theory,
and to classify approaches to interactive narrative. The traditional
question driving research in interactive narrative is, ‘how can an in-
teractive narrative deal with a high degree of player agency, while
maintaining a coherent and well-formed narrative?’ This question
derives from an Aristotelian approach to interactive narrative that,
as the question shows, is inherently antagonistic to player agency.
Within this approach, player agency must be restricted and manip-
ulated to maintain the narrative. Two alternative approaches based
on Brecht’s Epic Theatre and Boal’s Theatre of the Oppressed are
reviewed. If a Boalian approach to interactive narrative is taken the
conflict between narrative and player agency dissolves. The question
that emerges from this approach is quite different from the traditional
question above, and presents a more useful approach to applying in-
teractive narrative as a constructivist learning activity
Photoinduced Processes in Self-Assembled Porphyrin/Perylene Bisimide Metallosupramolecular Boxes
No full textTwo new supramolecular boxes, (ZnMC)2(rPBI)2 and (ZnMC)2(gPBI)2, have been obtained by axial
coordination of N,N′-dipyridyl-functionalized perylene bisimide (PBI) dyes to the zinc ion centers of two
2+2 porphyrin metallacycles (ZnMC ) [trans,cis,cis-RuCl2(CO)2(Zn · 4′-cis-DPyP)]2). The two molecular
boxes involve PBI pillars with different substituents at the bay area: the “red” PBI (rPBI ) N,N′-di(4-pyridyl)-
1,6,7,12-tetra(4-tert-butylphenoxy)perylene-3,4:9,10-tetracarboxylic acid bisimide) containing tert-butylphenoxy
substituents and the “green” PBI (gPBI ) N,N′-di(4-pyridyl)-1,7-bis(pyrrolidin-1-yl)perylene-3,4:9,10-
tetracarboxylic acid bisimide) bearing pyrrolidinyl substituents. Due to the rigidity of the modules and the
simultaneous formation of four pyridine-zinc bonds, these discrete adducts self-assemble quantitatively and
are remarkably stable in dichloromethane solution. The photophysical behavior of the new supramolecular
boxes has been studied in dichloromethane by emission spectroscopy and ultrafast absorption techniques. A
different photophysical behavior is observed for the two systems. In (ZnMC)2(rPBI)2, efficient electron transfer
quenching of both perylene bisimide and zinc porphyrin chromophores is observed, leading to a charge separated
state, PBI--Zn+, in which a perylene bisimide unit is reduced and zinc porphyrin is oxidized. In the deactivation
of the perylene bisimide localized excited state, an intermediate zwitterionic charge transfer state of type
PBI--PBI+ seems to play a relevant role. In (ZnMC)2(gPBI)2, singlet energy transfer from the Zn porphyrin
chromophores to the perylene bisimide units occurs with an efficiency of 0.7. This lower than unity value is
due to a competing electron transfer quenching, leading to the charge separated state PBI--Zn+. The distinct
photophysical behavior of these two supramolecular boxes is interpreted in terms of energy changes occurring
upon replacement of the “red” rPBI by “green” gPBI
Immunodepletion of α-plurivorin effector leads to loss of virulence of Phytophthora plurivora towards Fagus sylvatica
No full textPhytophthora species secrete several proteins during their interaction with plants. Some of these proteins manipulate host metabolism favouring infection, while others can be recognized by plants thus triggering defence. Elicitins are known to elicit plant defences, leading to resistance. Here, we characterized the elicitin α-plurivorin and proved that it was essential for the virulence of Phytophthora plurivora towards Fagus sylvatica. The immunodepletion of this peptide impaired its penetration into host tissue and in parallel P. plurivora lost its ability to colonize beech roots. Furthermore, the lack of α-plurivorin inside the host led to an up-regulation of several defence-related genes of both salicylic acid and jasmonate/ethylene pathways, suggesting that α-plurivorin might act as an effector-triggered susceptibility during infection. Consequently, plants survived infection with P. plurivora after α-plurivorin immunodepletion, whereas the majority of the infected control plants had died at the end of the experiment. Because canonical elicitins are ubiquitously secreted by many Phytophthora species, it is possible that these molecules may play a similar role in other susceptible interactions, being a potential target for controlling Phytophthora diseases
Dendrimers with a 4,4′-bipyridinium core and electron-donor branches. Electrochemical and spectroscopic properties
No full textThe synthesis, characterization, and electrochemical and spectroscopic properties of a new family of dendrimers comprising a 4,4′-bipyridinium core and 1,3-dimethyleneoxybenzene-type dendrons are described. The electrochemical results show that there is no significant inhibition of electron transfer involving the dendrimer core by the dendrons. The strong fluorescence of the 1,3-dimethyleneoxybenzene units of the branches is completely quenched as a result of charge-transfer interactions with the core
The passive constitution of sensation: association and affection in Husserl and Merleau-Ponty
No full textLos análisis sobre la pasividad emprendidos por E. Husserl constituyen un importante antecedente de la fenomenología desarrollada por M. Merleau-Ponty. En este sentido, es posible reconocer líneas de interpretación que muestran una clara continuidad entre ambos: la fundación de estratos yoicos en procesos pasivos, el rechazo de las interpretaciones reale» e irreales de la asociación, la concepción gestáltica del sentir y el carácter afectante de lo sensible. Merleau-Ponty, sin embargo, estima más allá de Husserl que una real consideración de la dimensión pasiva de la experiencia implica debilitar la prioridad constituyente del polo subjetivo en la experiencia del mundo.This paper examines Husserl’s theory of passive synthesis of association identifying some of its resonances in Merleau-Ponty’s phenomenology. For this purpose, first it situates the specific problem in the general context of Husserlian analyses on passivity and its different levels, taking into account the Merleau-Pontyan reception of these analyses. Secondly, it considers the parallel critique that both philosophers address to the atomist interpretation of associative synthesis. In this way, it is finally possible to evaluate certain differences between the interpretation that each author proposes of the affecting nature of the sensible.Fil: Garcia, Esteban Andres. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires; ArgentinaFil: Osswald, Andrés Miguel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires; Argentin
Oligothia dendrimers for the formation of gold nanoparticles
No full textThe synthesis and characterization of oligothia dendrimers and their use for the formation of gold nanoparticles is described. The role played by these dendrimers in controlling the stability and size of the particles is discussed. It is shown that the generation of the dendrimers, as well as the position of the sulfur atoms in the dendritic structure (S6G1 and S 9G1), influence the formation and reactivity of the nanoparticles. UV-visible spectroscopy, 1H nuclear magnetic resonance spectroscopy and high-resolution transmission electron microscopy have been employed for the characterization of the nanoparticles. Furthermore, purification by Soxhlet extraction has been performed
Osswald, Helen (Birth, 1905-12-27)
No full textAddress: 448 Klotter Avenue5705/Pg.136/1905/F W/Am./Am./Mrs. Hardt, Mid.Original record filed in drawer labeled 'OSER-OTTEN'
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