Training educational administrators in Central America     

Jean-François Bernède 《Prospects》1977,7(1):113-117

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A tapered channel microfluidic device for comprehensive cell adhesion analysis, using measurements of detachment kinetics and shear stress-dependent motion     

Rupprecht P  Golé L  Rieu JP  Vézy C  Ferrigno R  Mertani HC  Rivière C 《Biomicrofluidics》2012,6(1):14107-1410712

We have developed a method for studying cellular adhesion by using a custom-designed microfluidic device with parallel non-connected tapered channels. The design enables investigation of cellular responses to a large range of shear stress (ratio of 25) with a single input flow-rate. For each shear stress, a large number of cells are analyzed (500–1500 cells), providing statistically relevant data within a single experiment. Besides adhesion strength measurements, the microsystem presented in this paper enables in-depth analysis of cell detachment kinetics by real-time videomicroscopy. It offers the possibility to analyze adhesion-associated processes, such as migration or cell shape change, within the same experiment. To show the versatility of our device, we examined quantitatively cell adhesion by analyzing kinetics, adhesive strength and migration behaviour or cell shape modifications of the unicellular model cell organism Dictyostelium discoideum at 21 °C and of the human breast cancer cell line MDA-MB-231 at 37 °C. For both cell types, we found that the threshold stresses, which are necessary to detach the cells, follow lognormal distributions, and that the detachment process follows first order kinetics. In addition, for particular conditions’ cells are found to exhibit similar adhesion threshold stresses, but very different detachment kinetics, revealing the importance of dynamics analysis to fully describe cell adhesion. With its rapid implementation and potential for parallel sample processing, such microsystem offers a highly controllable platform for exploring cell adhesion characteristics in a large set of environmental conditions and cell types, and could have wide applications across cell biology, tissue engineering, and cell screening.  相似文献   

Δ-distance: A family of dissimilarity metrics between images represented by multi-level feature vectors     

Marta Rukoz  Maude Manouvrier  Geneviève Jomier 《Information Retrieval》2006,9(6):633-655

This article presents the Δ-distance, a family of distances between images recursively decomposed into segments and represented by multi-level feature vectors. Such a structure is a quad, a quin or a nona-tree resulting from a fixed and arbitrary image partition or from an image segmentation process. It handles positional information of image features (e.g. color, texture or shape). Δ-distance is the generalized form of dissimilarity measures between multi-level feature vectors. Using different weights on tree nodes and different distances between nodes, distances between trees or visual similarity between images can be computed based on the general definition of Δ. In this article, we present three Δ-based distance families: two families of distances between tree structures, called -distance( for Tree) and -distance ( for Segment), and a family of visual distances between images, called ( for Visual). The -distance visually compares two images using their tree representation and the other two distances compare the tree structures resulting from image segmentation. Moreover, we show how existing distances between multi-level feature vectors appear to be particular cases of the Δ-distance  相似文献   

Coherence in professional education: does it foster dedication and identification?     

Kåre Heggen  Lars Inge Terum 《Teaching in Higher Education》2013,18(6):656-669

This article examines the impact of professional education on students' dedication to and identification with a profession. The premise is that professional education is not only about knowledge acquisition and reasoning but also about attitudes and aspirations. In fostering dedication and identification, students' experiences of relevance seem to be important. The concept of coherence seen as an expression of relevance is introduced and measured by four kinds of interactions: Theory–practice interaction, teacher–student interaction, peer interaction and supervisor–student interaction. Analysis indicates that coherence, particularly as theory–practice interaction, peer interaction and supervisor–student interaction, has a significant impact on dedication to and identification with a profession. Longitudinal survey data – collected from students in colleges for teaching, nursing and social work – are analysed.  相似文献   

Whisper it softly,professors are really academic developers too     

Michèle Saint‐Jean 《International Journal for Academic Development》2013,18(2):181-183

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The lived experiences of orphaned learners in South Africa: implications for the provision of quality education     

Kholofelo Charlotte Motha  George Frempong 《International Journal of Inclusive Education》2013,17(7):686-697

Learners living in impoverished communities and subjected to the kind of disadvantage in operation in their home environment are at risk of receiving education of an inferior quality. The situation is worse for orphans, especially those residing in poor communities in that they bring to school peculiar attributes which poses challenges for the South African government in its endeavour to provide quality education for all. This paper presents constructed narratives of four primary-school learners living in a poor community in South Africa. The narratives are presented from the perspectives of the learners themselves, teachers and caregivers. These narratives reveal that following the death of parents, orphaned learners experience emotional changes, increased responsibilities, safety concerns as well as absence of learning support in the case of sibling-headed households. We argue that the challenges they experience in their home environment impact negatively on learning at school. We, therefore, propose that the extended family and the community serve as resources in providing needed support for promoting positive educational experiences to these learners.  相似文献   

Teachers’ dilemmatic decision-making: reconciling coexisting policies of increased student retention and performance     

Charlotte Jonasson  Åsa Mäkitalo  Klaus Nielsen 《Teachers and Teaching》2013,19(7):831-842

In recent years, many countries within the Organisation for Economic Co-operation and Development have formulated educational policies aimed at providing better education to more students. However, this may be perceived as constituting dilemmatic spaces, where teachers must make efforts to reconcile coexisting political demands in their everyday work. The purpose of this article is to provide insight into how teachers handle coexisting educational policies of increased student retention and performance. Empirical findings from a one-year field study at a Danish vocational school explore how teachers’ decision-making as response to coexisting demands of increased student retention and performance involves the development of various pedagogical approaches to the students: an active ‘caring’ approach, a passive ‘wait until this class is over’ approach, an active ‘vocational gate-keeping’ approach, and a passive ‘wait and see whether they drop out’ approach. Based on the findings, it is argued that the various pedagogical approaches are developed through social negotiations with leaders, students, and other teachers. Moreover, these pedagogical approaches lead to the development of further negotiated, dilemmatic decisions to be made. Thus, a dynamic approach to teachers’ dilemmatic decision-making is proposed.  相似文献   

Spelling,Reading Abilities and Speech Perception in Deaf Children with a Cochlear Implant     

Marie Simon  Lauren A. Fromont  Marie-Thérèse Le Normand 《Scientific Studies of Reading》2013,17(6):494-508

ABSTRACT

This study aims to compare word spelling outcomes for French-speaking deaf children with a cochlear implant (CI) with hearing children who matched for age, level of education and gender. A picture written naming task controlling for word frequency, word length, and phoneme-to-grapheme predictability was designed to analyze spelling productions. A generalized linear mixed model on the percentage of correct spelling revealed an effect of participant’s reading abilities, but no effect of hearing status. Word frequency and word length, but not phoneme-to-grapheme predictability, contributed to explaining the spelling variance. Deaf children with a CI made significantly less phonologically plausible errors and more phonologically unacceptable errors when compared to their hearing peers. Age at implantation and speech perception scores were related to deaf children’s errors. A good word spelling level can be achieved by deaf children with a CI, who nonetheless use less efficiently the phoneme-to-grapheme strategy than do hearing children.  相似文献   

NURTURING EARLY CHILDHOOD PROFESSIONALISM: THE RHODE ISLAND EARLY CHILDHOOD SUMMER INSTITUTE     

Charlotte Diffendale  Diane M. Horm‐Wingerd  David A. Caruso  Virginia Nardone 《Journal of Early Childhood Teacher Education》2013,34(1):77-87

This article describes the independent study project of a student who was a graduate assistant in a child development laboratory preschool when Hurricanes Katrina and Rita struck the Gulf Coast area. Through her experiences with “Project Katrina” she deepens her understanding of developmentally appropriate practices as she learns firsthand about the project approach and writing an article for publication in a professional journal.  相似文献   

An Instructional Strategy to Introduce Pedagogical Content Knowledge Using Venn Diagrams     

Charlotte A. Otto  Susan A. Everett 《Journal of Science Teacher Education》2013,24(2):391-403

This paper describes the use of a three-circle Venn diagram as a vehicle for introducing pre-service elementary teachers to pedagogical content knowledge (PCK). Each circle of the diagram represents pedagogy, content and context individually. The overlap of any two circles represents the interaction between the circles. For example, the overlap of pedagogy and context relates to the ways that each of these general topics influences the other. The overlap of all three circles represents a complete lesson that is an integration of the three major components of PCK. The Venn diagram is an easily remembered graphic illustration of PCK that can be useful in planning lessons. The use of this graphic organizer in a science capstone course required of all pre-service elementary teachers is described.  相似文献