Search results for "axis"
showing 10 items of 751 documents
Magnetic resonance imaging of the siliceous skeleton of the demosponge Lubomirskia baicalensis
2005
The skeletal elements (spicules) of the demosponge Lubomirskia baicalensis were analyzed; they are composed of amorphous, non-crystalline silica, and contain in a central axial canal the axial filament which consists of the enzyme silicatein. The axial filament, that orients the spicule in its longitudinal axis exists also in the center of the spines which decorate the spicule. During growth of the sponge, new serially arranged modules which are formed from longitudinally arranged spicule bundles are added at the tip of the branches. X-ray analysis revealed that these serial modules are separated from each other by septate zones (annuli). We describe that the longitudinal bundles of spicule…
An Extended Filament Based Lamellipodium Model Produces Various Moving Cell Shapes in the Presence of Chemotactic Signals
2015
The Filament Based Lamellipodium Model (FBLM) is a two-phase two-dimensional continuum model, describing the dynamcis of two interacting families of locally parallel actin filaments (C.Schmeiser and D.Oelz, How do cells move? Mathematical modeling of cytoskeleton dynamics and cell migration. Cell mechanics: from single scale-based models to multiscale modeling. Chapman and Hall, 2010). It contains accounts of the filaments' bending stiffness, of adhesion to the substrate, and of cross-links connecting the two families. An extension of the model is presented with contributions from nucleation of filaments by branching, from capping, from contraction by actin-myosin interaction, and from a pr…
Reflections on dialogicity: Challenges and suggestions by mathematics student teachers
2021
Abstract Research related to dialogic teaching has been gaining ground in recent decades. On a theoretical level, researchers have described how sociocultural approaches are linked to dialogic teaching. In addition, empirical studies have explained how dialogic teaching manifests itself in educational dialogue and classroom interactions. However, studies addressing how the dialogic theory and practice could be linked meaningfully in teacher education and professional development programs in subject teacher education and related praxis are still limited. Especially in the case of math teacher education, the reported professional development programs are limited in number. Whereas the tendenc…
Experience, Subjectivity and Politics in the Italian Feminist Movement
2006
This article describes the political practices of a part of the Italian women’s movement that, as of the 1980s, gave way to the sexual difference thought. Through a political analysis of their own experience, which removed any humanist identity assumptions, the women’s movement generated new practices and discourses. With these, women were able to exert self-criticism, and simultaneously to produce new subjectivities articulated around the sexual difference concept. The difference thought helped highlight the limits of institutional policy, renewing the premises of political analysis and redefining the borders of what was deemed to be ‘political’. Intended to foster dialogue with other femi…
Old French Parataxis: syntactic variant or stylistic variation?
2012
The existence of paratactic constructions in Old French is a well-known fact, as in the following: Co sent Rollanto la veue ad perdue‘Roland feels (that) he has lost his sight’ (Chanson de Roland2297). These structures alternate with structures containing que: Co sent Rollant que s’espee li tolt‘Roland feels that his sword has been taken from him’ (Chanson de Roland2284). Although traditional philologists note that different types of asyndetic subordinate clauses exist, they do not provide an explanation of how and why such structures alternate with those introduced by que. Moreover, a detailed analysis reveals that the distribution of paratactic constructions does not seem to be homogeneou…
Optical near-field microscopy of light focusing through a photonic crystal flat lens
2008
We report here the direct observation by using a scanning near-field microscopy technique of the light focusing through a photonic crystal flat lens designed and fabricated to operate at optical frequencies. The lens is fabricated using a III-V semiconductor slab, and we directly visualize the propagation of the electromagnetic waves by using a scanning near-field optical microscope. We directly evidence spatially, as well as spectrally, the focusing operating regime of the lens. At last, in light of the experimental scanning near-field optical microscope pictures, we discuss the lens ability to focus light at a subwavelength scale.
Nordic contemporary art education and the environment: Constructing an epistemological platform for Art Education for Sustainable Development (AESD)
2012
How can art educators address questions of environmental sustainability, accepting to be ethically normative but avoiding becoming dogmatic? How can the complex ‘pool’ of knowledge generated in and through art education research become useful in working with these questions, which many of us find overwhelmingly difficult? AESD – Art Education for Sustainable Development – is a concept coined for this article with the intention of bringing environmental problems onto the agenda. In an attempt to provoke the necessary discussion about environmental sustainability in art education, the article examines selected texts from recent Nordic research in order to build an ‘epistemological platform’ t…
Synthetic aperture microscopy using off-axis illumination and polarization coding
2007
A new method to improve the resolution of optical imaging systems beyond the classical Rayleigh resolution limit is presented. The technique relies on synthetic aperture generation in three stages. The first one (encoding stage) uses an illumination procedure that combines both on-axis and off-axis illumination beams with different polarization states onto the object. After the imaging system, a second stage (decoding stage) allows the recovering of the encoded spatial-frequency object information by means of an interferometric configuration based on the polarization coding carried out in the previous stage. Finally, a third stage (digital post-processing stage) is used to generate a synthe…
Talin1 sets the stage for dendritic cell activation
2020
In dendritic cells, talin1 links integrin binding to efficient TLR downstream signaling through interaction with MyD88 and PIP5K.
What is (good) practitioner research?
2016
This special issue recognizes EAPRIL as being a platform for practitioner and practice-based research and by organizing the 10th annual conference for practitioner research on improving learning in education and professional practice. Papers in this conference and in this special issue are rooted in practice-based research or practitioner research. They reflect the popularity of practitioner research in vocational teacher education and in universities of applied sciences. Reason enough for the authors of the current paper to reflect on the question: “What is practitioner research?” And, more importantly what makes good practitioner research? Reviews show that people use broad interpretation…