共查询到20条相似文献，搜索用时 562 毫秒
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Liu LP Xiang JH Dong B Natarajan P Yu KJ Cai NE 《Journal of Zhejiang University. Science. B》2006,7(6):467-474
The ascidian Ciona intestinalis is a model organism of developmental and evolutionary biology and may provide orucial clues concerning two fundamental matters, namely, how chordates originated from the putative deuterostome ancestor and how advanced chordates originated from the simplest chordates. In this paper, a whole-life-span culture of C. intestinalis was conducted. Fed with the diet combination of dry Spirulina, egg yolk, Dicrateria sp., edible yeast and weaning diet for shrimp, C. intestinalis grew up to average 59 mm and matured after 60 d cultivation. This culture process could be repeated using the artificially cultured mature ascidians as material. When the fertilized eggs were maintained under 10, 15, 20, 25 ℃, they hatched within 30 h, 22 h, 16 h and 12 h 50 min respectively experiencing cleavage, blastulation, gastrulation, neurulation, tailbud stage and tadpole stage, The tadpole larvae were characterized as typical but simplified chordates because of their dorsal nerve cord, notochord and primordial brain. After 8-24 h freely swimming, the tadpole larvae settled on the substrates and metamorphosized within 1-2 d into filter feeding sessile juvenile ascidians. In addition, unfertilized eggs were successfully dechorionated in filtered seawater containing 1% Tripsin, 0.25% EDTA at pH of 10.5 within 40 min. After fertilization, the dechorionated eggs developed well and hatched at normal hatching rate. In conclusion, this paper presented feasible methodology for rearing the tadpole larvae of C. intestinalis into sexual maturity under controlled conditions and detailed observations on the embryogenesis of the laboratory cultured ascidians, which will facilitate developmental and genetic research using this model system. 相似文献
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Advances have been made in detecting and deterring the student plagiarism that has accompanied the uptake and development of the internet. Many authors from the late 1990s onwards grappled with plagiarism in the digital age, presenting articles that were provoking and established the foundation for strategies to address cyber plagiarism, including software such as TurnitinTM. In the spirit of its predecessors, this article presents a new, less-detectable method of cyber-facilitated plagiarism known as ‘back translation’, where students are running text through language translation software to disguise the original source. This paper discusses how this plagiarism strategy attempts to subvert academic attempts to detect plagiarism and maintain academic integrity in the digital age, before presenting useful detection tools and then critiquing three classroom plagiarism management approaches for their usefulness in the current digital and educational context. 相似文献
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Sharon L. Nichols Paul A. Schutz Kelly Rodgers Kimberly Bilica 《Teachers and Teaching》2017,23(4):406-421
The goal of our project was to develop an understanding of the connections among emotional episodes and emerging professional teacher identities of first year teachers. We interviewed eight first year mathematics and science teachers. We asked them to reflect on emotional episodes and talk about how those emotions informed their teaching identities. Our data yielded a model of ‘identity-work’ that reflected the teachers’ engagement in a reflective process of understanding themselves as it related to those emotional episodes. Our model includes four key processes: (1) Teacher incoming identity beliefs; (2) Teacher identity emotional episodes; (3) Teacher attributions and (4)Identity adjustment. All of our teachers exhibited a form of this process with some teachers elaborating on the ways in which pleasant emotional experiences confirmed their identities and others elaborating on the ways in which unpleasant emotional experiences caused them to confront and/or adjust their emergent identities. Implications for future research and teacher education are discussed. 相似文献
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China)With many tests, the paper studied the main factors affected to coal fine grinding result, such as ball grinding rotary speed, ball coal quality ratio, ball grinding 相似文献
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《Journal of Further & Higher Education》2012,36(3):265-275
This article sets out to offer the reader an opportunity to engage with our emerging ideas about a reflective, person centred model for students and facilitators using problem‐based learning (PBL). The model developed initially through several strands of qualitative inquiry including research with students, immersion in the existing literature and a reflexive approach to our own work. We feel it enables the user to explore key challenges of PBL curricula through the interactive elements of readiness, congruence, group dynamics, communication and environment with the person being pivotal to the process. It is suggested that the model offers an opportunity to consider crucial questions in the successful implementation and development of PBL practice and requires users to challenge their own thinking. It is a tool for individuals, groups and organizations involved in PBL. 相似文献
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David Hartley 《牛津教育评论》2013,39(5):629-642
In England, a ‘revised’ educational code appears to be emerging. It centres upon the concept of ‘personalisation’. Its basis is less in educational theory, more in contemporary marketing theory. Personalisation can be regarded in two ways. First, it provides the rationale for a new mode of public‐service delivery, one which seeks to enable ‘users’ to co‐produce with professionals a solution to their needs. In this endeavour, it takes further that process of marketisation which had been set in train under the New Public Management. Second, it portends a new ‘grammar’ for the school, in the guise of ‘personalised learning’. At this stage, what shall count as personalisation—particularly in relation to personalised learning—remains incoherent and inchoate. For its justification as a policy, personalisation appeals to child‐centredness, to democracy and to consumerism. The analysis draws on contemporary social and marketing theory. 相似文献
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高飞 《中学生英语读写(高中版)》2003,(4)
Inrecentseniorsurveys，amajorityofuniversitystudentshaveindi鄄catedthattheyintendtopursue（goonwith）graduatestudysometimeinthefuture．ManyarethinkingaboutanMBA（工商管理硕士）．Therearesomebasicquestionsthataresimpletoaskbutrequireself鄄explorationandresearch：WhypursueanMBA？Typically，youareprobablythinkingaboutpursuinganMBAforfourbasicreasons：１．Yourchosenprofessiondemandsfurtherstudy．２．Youwanttoenhanceyourmarketabilityandsalary．３．Youwanttochangecareer．４．Youarecommittedtof… 相似文献
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在有关数列问题中，经常要求数列的通项，许多同学对此类问题感到困难．特别是给出Sn与an的函数关系，即Sn=F(an)型，其中Sn表示数列{an}的前n项和，an表示数列的第n项．此类题难就难在关系复杂，不便转化．下面笔者根据自己的教学实践谈一谈此类问题的解题策略． 相似文献
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金志刚 《中学数学教学参考》2005,(9):59-60
If F1 （c, 0） and F2（ -c, 0） are two fixed points in the plane and a is a constant, 0〈c〈a, then the set of all points P in the plane such that ｜ PF1｜ ＋ ｜ PF2 ｜ = 2a is an ellipse. F1 and F2 are the loci of the ellipse. 相似文献
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Supporting emerging teacher identities: can we identify teacher potential among students? 总被引：1，自引：1，他引：0
Erika Löfström Katrin Poom‐Valickis Markku S. Hannula Samuel R. Mathews 《欧洲师范教育杂志》2010,33(2):167-184
The research focuses on Estonian university students’ emerging teacher identity and their interest in becoming teachers. Five hundred and sixty‐five first, third and fifth year students participated in the survey. The results suggest that pedagogical reasons for entering teacher education and clear motives for studying are significant indicators of teacher potential. Pedagogical reasons for entering teacher education or the teaching profession and the wish to function as a change agent in the society were related to academic self‐efficacy beliefs and the belief that the teacher expertise is mainly pedagogical in nature. However, at the point in their studies at which the students are able to choose their masters programme and entry into teacher education, their likelihood of choosing teacher education remains low, indicating that there is a need to develop pedagogical content, study counselling and career guidance services to encourage students’ continued interest in and entry to teacher education and the teaching profession. 相似文献
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The International Baccalaureate (IB) has undergone rapid growth and largely unhindered expansion over the past four decades. It has moved beyond its European nexus and the three IB programmes now have a relatively large presence in the USA, especially among public high schools. The IB gathered federal funding in 2003, and a concerted attack has subsequently emerged from a vast array of ultra-conservative agencies and commentators who denounce the curriculum as federal interference, and fundamentally ‘un-American’. This paper explores the complex nature of this ‘culture war’ and reveals the key issues and protagonists. 相似文献
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《师资教育杂志》2012,38(2):209-210
This article brings together two studies which contribute to the examination of the nature of professionalism in education by focusing on the perspectives of two under-researched groups namely ‘teaching assistants’ and teacher educators working ‘either side’ of the school teacher. The projects were conducted in, and framed by, the UK policy context of public sector modernization and cuts, and raise issues of relevance to international debates on notions of professionalism in education in a context of neo-liberal policy and austerity. The studies drew upon different approaches including autoethnography, life history and discourse analysis. The authors examine the formation and representation of professional identity in education through the discourses of ‘professionalism’ of teaching assistants and teacher educators. Professionalism is articulated through three themes in the accounts; ‘non-standard’ professional transformations, role ambiguity, and the role of classroom experience and higher education in the development of professional identities. Through these themes the perspectives of teaching assistants and teacher educators locate the notion of ‘teacher professionalism’ within a broader concept of professionalism in education providing alternatives to the discourse of imposed policy, and the authors reflect upon the ways in which these voices contribute to the wider international debate on professionalism in education. 相似文献
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Katerina Bodovski 《British Journal of Sociology of Education》2014,35(3):389-412
This study makes two contributions to the literature. First, it bridges the sociological discussion of social class habitus with psychological notions of adolescents’ educational expectations, locus of control, and self-concepts. Second, it empirically examines the relationships between early employed parental practices and expectations and adolescents’ dispositions using a recently available wave of data from a nationally representative sample of US students. The findings reveal that students from higher socioeconomic status families had more positive general and area-specific self-concepts, higher educational expectations, higher internal locus of control, and higher academic achievement, and higher parental educational expectations were positively associated with all studied outcomes. The findings provide only partial support for the effects of early parental practices and highlight the role of gender and race/ethnicity in shaping adolescents’ habitus. 相似文献