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841.
The successful encapsulation of human hepatocellular carcinoma (HepG2) cells would greatly assist a broad range of applications in tissue engineering. Due to the harsh conditions during standard chitosan fiber fabrication processes, encapsulation of HepG2 cells in chitosan fibers has been challenging. Here, we describe the successful wet-spinning of chitosan-alginate fibers using a coaxial flow microfluidic chip. We determined the optimal mixing conditions for generating chitosan-alginate fibers, including a 1:5 ratio of 2% (w∕w) water-soluble chitosan (WSC) solution to 2% (w∕w) alginate solution. Ratio including higher than 2% (w∕w) WSC solution increased aggregation throughout the mixture. By suspending cells in the WSC-alginate solution, we successfully fabricated HepG2 cell-laden fibers. The encapsulated HepG2 cells in the chitosan-alginate fibers were more viable than cells encapsulated in pure alginate fibers, suggesting that cross-linked chitosan provides a better environment for HepG2 cells than alginate alone. In addition, we found that the adhesion of HepG2 cells on the chitosan-alginate fiber is much better than that on the alginate fibers. 相似文献
842.
843.
844.
Martin Forsey 《Zeitschrift für Erziehungswissenschaft》2014,17(3):95-112
Schools offer powerful scope for viewing and comprehending the wider society in which they are produced and replicated. The ways in which schools are structured, positioned, funded, managed, appreciated, critiqued, cared for and neglected, presents us with a means for seeing beyond the rhetoric of a nation state to the lived realities faced by its citizens. In this paper I want to link the development of Australian educational policies to shifts in socio-cultural thought and practice that reflect and reproduce a mobile modernity. I am interested in school funding policies as they relate to the private, or non-government education sector from the late colonial period to these so-called neo-liberal/late modern times. The interrogated scenes shift about amongst a complex of interrelated fields, from the urban to the rural, the public and the private, as well as the primary, secondary and tertiary layers of educational “offerings”. The periodization reveals a loosening of commitments to a secular, state-centred, welfare-focused modernity, towards a privatizing, individualizing “second modernity”. Drawing from a range of empirical studies of school choice I highlight the shifting ideas and practices of those involved in the re-production of both public and private schools either as professionals/workers in the system, or as “consumers” of the products available in education’s “quasi-markets”. 相似文献
845.
Looking at the conflictual constitution of educational systems by equality and excellence, this paper examines the discursive formation of two political rationalities in the contemporary German educational system that are directly opposed. While early childhood and primary education discourses are dominated by a terminology of equity, tertiary education institutions such as universities are described with a terminology of excellence that has become a reference point for political interventions and institutional reform processes.Taking up the theoretical position of hegemony-theory, governmentality studies and system theory, the paper analyzes the rules of justification these hegemonic discourses refer to by employing a discourse analysis of strategic, conceptional, and institutional texts of the German education policy discourse between 2003 and 2010. The paper puts forth the thesis that mobilizing and optimizing represent the common principles of equality and excellence as rationalities of the maximal mobilization of educational ressources. 相似文献
846.
Steffen Hillmert 《Zeitschrift für Erziehungswissenschaft》2014,17(2):73-94
This paper describes mutual links between educational attainment and social inequality from a life course perspective. Analytically we distinguish between aspects of inequality with regard to access to education, consequences of education, and social reproduction through education. A special emphasis is put on the role institutions play in these processes. The paper presents selected empirical findings, discusses theoretical mechanisms, and draws some conclusions for the conceptualisation of education systems. 相似文献
847.
Soziale Ungleichheit beim Zugang in eine Berufsausbildung: Welche Bedeutung haben die Institutionen?
The corporatistic governance model of nonacademic vocational training, which is predominant in Germany, has produced heterogeneous and complex conditions for the access to vocational training. Which training programs are offered and the selection of applicants is largely determined by the training companies themselves. Adolescents interested in vocational training are thus confronted with diverse admission requirements. Which resources they can and have to use in order to receive a training position is significantly determined by the respective admission requirements. The present paper elucidates key institutional conditions of the access to vocational training which can serve as explanations for the (re-)production of social inequalities in the transition process from school to vocational training. In particular, the inequalities with respect the admission to vocation training along the lines of educational degrees, gender, as well as regional, social, and ethnic backgrounds are investigated. 相似文献
848.
Jennifer Paetsch Katrin M. Wolf Petra Stanat Annkathrin Darsow 《Zeitschrift für Erziehungswissenschaft》2014,17(2):315-347
Children and adolescents of families with immigrant background are less successful in the German education systems than those without immigrant background. These differences can largely be explained by deficits in the language of instruction, indicating a lack of learning opportunities in the second language. The present paper investigates how it is possible to reduce language disparities before children enter school on the one hand and during the course of schooling on the other hand. This is being done by presenting the current state of research on the acquisition of a second language. In particular, recent findings on the influence of the quantity and quality of early childhood education on the language acquisition of children are summarized. Furthermore, findings on the effectiveness of attending all-day schools and of current programs for language instruction are presented. Finally, potential avenues for further development of language instruction as well as for future research are discussed. 相似文献
849.
Heinz-Hermann Krüger Catharina Keßler Ariane Otto Anne Schippling 《Zeitschrift für Erziehungswissenschaft》2014,17(3):221-241
Against the backdrop of the recent political discourse on elite and excellence in the German education system, this paper examines how such constructions manifest themselves in programmatic concepts of schools and in the orientations of their pupils and their peers. They are reconstructed on the basis of a qualitative research project on educational careers of young people. This paper focuses on pupils and their peers at an elite school of sports and an international school. Firstly, the state of research on those types of school as well as on educational careers of their pupils will be presented. Secondly, the theoretical reference points and the methodological design of the study will be introduced. At the core of the paper is the analysis of the education related orientations of selected cases of young people and their peers: How do they position themselves towards elite and excellence in their individual and collective orientations and how is this relevant for processes of distinction and coherence building in the groups? In the resuming part of the paper, the results will be summarised and related to the state of research and the scientific discourse on elite and excellence. 相似文献
850.