Student and Teacher Perceptions of the Use of Multimedia Supported Predict–Observe–Explain Tasks to Probe Understanding     

Kearney  Matthew  Treagust  David F.  Yeo  Shelley  Zadnik  Marjan G. 《Research in Science Education》2001,31(4):589-615

This paper discusses student and teacher perceptions of a new development in the use of the predict–observe–explain (POE) strategy. This development involves the incorporation of POE tasks into a multimedia computer program that uses real-life, digital video clips of difficult, expensive, time consuming or dangerous scenarios as stimuli for these tasks. The program was created by the first author to be used by pairs of secondary physics students to elicit their conceptions of force and motion and encourage discussion about these views. In this computer learning environment, students were required to type full sentence responses that were recorded by the computer for later analysis by the researcher. Other data sources for this study included audio and video recordings of student discussions, interviews with selected students and their teachers, classroom observations, and student questionnaires. This paper will report on some findings from the study, focussing on student and teacher perceptions of the computer-mediated POE tasks. The findings have implications for the effective use of multimedia to enhance meaningful learning in science classrooms.  相似文献   

Hydroxychavicol,a polyphenol from Piper betle leaf extract,induces cell cycle arrest and apoptosis in TP53-resistant HT-29 colon cancer cells     

Aiysvariyah RAJEDADRAM  Kar Yong PIN  Sui Kiong LING  See Wan YAN  Mee Lee LOOI 《Journal of Zhejiang University. Science. B》2021,22(2):112

This study aims to elucidate the antiproliferative mechanism of hydroxychavicol(HC).Its effects on cell cycle,apoptosis,and the expression of c-Jun N-terminal kinase(JNK)and P38 mitogen-activated protein kinase(MAPK)in HT-29 colon cancer cells were investigated.HC was isolated from Piper betle leaf(PBL)and verified by high-performance liquid chromatography(HPLC),nuclear magnetic resonance(NMR),and gas chromatography-mass spectrometry(GC-MS).The cytotoxic effects of the standard drug 5-fluorouracil(5-FU),PBL water extract,and HC on HT-29 cells were measured after 24,48,and 72 h of treatment.Cell cycle and apoptosis modulation by 5-FU and HC treatments were investigated up to 30 h.Changes in phosphorylated JNK(pJNK)and P38(pP38)MAPK expression were observed up to 18 h.The half maximal inhibitory concentration(IC₅₀)values of HC(30μg/mL)and PBL water extract(380μg/mL)were achieved at 24 h,whereas the IC₅₀of 5-FU(50μmol/L)was obtained at 72 h.Cell cycle arrest at the G0/G1 phase in HC-treated cells was observed from12 h onwards.Higher apoptotic cell death in HC-treated cells compared to 5-FU-treated cells(P<0.05)was observed.High expression of pJNK and pP38 MAPK was observed at 12 h in HC-treated cells,but not in 5-FU-treated HT-29 cells(P<0.05).It is concluded that HC induces cell cycle arrest and apoptosis of HT-29 cells,with these actions possibly mediated by JNK and P38 MAPK.  相似文献   

eVALUate: an evaluation instrument for measuring students’ perceptions of their engagement and learning outcomes     

Beverley Oliver  Beatrice Tucker  Ritu Gupta  Shelley Yeo 《Assessment & Evaluation in Higher Education》2008,33(6):619-630

In the current climate in Australian higher education, quality assurance in university teaching is a priority. In particular, the introduction of the Learning and Teaching Performance Fund (LTPF) has refocused attention on universities’ internal student evaluation survey instruments. This paper reports the development, validation and implementation of a new unit survey instrument which prompts students to reflect on what helps their achievement of unit learning outcomes, and to report their levels of motivation, engagement and overall satisfaction with a semester‐long course or unit of study. The instrument (eVALUate) was created from precepts reported in the research literature, current practices in evaluating teaching, and sound quality assurance practices appropriate to a university outcomes‐focused education paradigm.  相似文献   

The Development of Diploma in Education Student Teachers’ Mathematics Pedagogical Content Knowledge     

Suat Khoh Lim-Teo  Kwee Gek Chua  Wai Kwong Cheang  Joseph K. Yeo 《International Journal of Science and Mathematics Education》2007,5(2):237-261

Mathematics pedagogical content knowledge (MPCK) of teachers cannot be easily defined but is a complex concept integrating generic pedagogical knowledge, mathematics teaching methodology as well as knowledge of the discipline of mathematics. It is the objective of mathematics methodology courses in teacher preparation programmes to begin the development of MPCK in their pre-service teachers. As part of a research study on the development of MPCK in primary school beginning teachers, a 16-item instrument was developed to measure some aspects of the MPCK for teaching mathematics at primary level. The instrument was administered to the 2003 Intake of the Diploma in Education student teachers at the National Institute of Education, Singapore just at the beginning of their programme. As they completed their methodology course in February 2005, the instrument was administered again. This paper will discuss the findings concerning their performance in these two tests, with reference to the overall performance as well as topic-specific and MPCK construct-specific performance. The findings indicate that student teachers at the beginning of their programmes are generally quite weak in their mathematics pedagogical content knowledge, as might be expected. There was significant improvement in some aspects of their MPCK on completion of their mathematics pedagogy course.  相似文献   

Microfluidic blood plasma separation via bulk electrohydrodynamic flows   总被引：1，自引：0，他引：1  

Dian R. Arifin  Leslie Y. Yeo    James R. Friend 《Biomicrofluidics》2007,1(1)

An effective mechanism for rapid and efficient microfluidic particle trapping and concentration is proposed without requiring any mechanically moving parts. When a voltage beyond the threshold atmospheric ionization value is applied on a sharp electrode tip mounted at an angle above a microfluidic liquid chamber, the bulk electrohydrodynamic air thrust that is generated results in interfacial shear and, hence, primary azimuthal liquid surface recirculation. This discharge driven vortex mechanism, in turn, causes a secondary bulk meridional liquid recirculation, which produces an inward radial force near the bottom of the chamber. Particles suspended in the liquid are then rapidly convected by the bulk recirculation toward the bottom, where the inward radial force causes them to spiral in a helical swirl-like fashion toward a stagnation point. In particular, we show that these flows, similar to Batchelor flows occurring in a cylindrical liquid column between a stationary and rotating disk, can be used for the separation of red blood cells from blood plasma in a miniaturized device.  相似文献   

Redesigning problem-based learning in the knowledge creation paradigm for school science learning     

Jennifer Yeo  Seng Chee Tan 《Instructional Science》2014,42(5):747-775

The introduction of problem-based learning into K-12 science classrooms faces the challenge of achieving the dual goal of learning science content and developing problem-solving skills. To overcome this content-process tension in science classrooms, we employed the knowledge-creation approach as a boundary object between the two seemingly contradicting activities: learning of science content and developing problem-solving skills. As part of a design research, we studied a group of Grade 9 students who were solving a problem related to the Law of Conservation of Energy. Through the lens of the activity theory, we found that students’ understanding of the intended science knowledge deepened as they made sense of the disciplinary-content knowledge in the context of the problem and concurrently, the students successfully developed solutions for the problem. This study shows that developing problem-solving competencies and content learning need not be disparate activities. On the contrary, we can harness the interdependency of these two activities to achieve dual goals in learning.  相似文献   

Educational Media and Telecommunications     

James W. Brown  Ben Armstrong  M. Lay Vay Sheldon 《Communication Booknotes Quarterly》2013,44(8):88-89

James W. Brown, ed. Educational Media Yearbook: 1977 (New York: R.R. Bowker, 1977 –$19.95)

Ben Armstrong and M. Lay Vay Sheldon (eds.) Religious Broadcasting Sourcebook (National Religious Broadcasters, Box 2254R, Morristown, N.J. 07960, 1976—price not given, but about $15.00, paper)

Telecommunications Policy (IPC Business Press Ltd., 205 East 42nd St., New York, N.Y. 10017– S78.00/year for four quarterly issues)

Person to Person (Washington: Smithsonian Institution National Museum of History and Technology, 1976—$2.00, paper)  相似文献   

Experienced Physical Education Teachers Reaching Their “Use-by Date”     

Peter R. Whipp  Gregory Tan  Poh Tin Yeo 《Research quarterly for exercise and sport》2013,84(5):487-499

With the needs of experienced teachers potentially overshadowed by a focus on recruitment, the purpose of this study was to retrospectively explore the reasons why three experienced physical education teachers resigned. They were interviewed through Louis and Smith's (1990) quality of work life (QWL) model. Data suggested shared dissatisfactions related to the lack of “genuine” opportunities to participate in educational debate and decision making, and limited professional respect shown by administrators and parents. A physical education teacher's “use-by date” was proposed. Unless these issues are further explored and addressed, quality teachers will continue to abandon the service.  相似文献   

Midwifery on Trial: Balancing Privacy Rights and Health Concerns after Roe v. Wade     

Mary M. Lay 《Quarterly Journal of Speech》2013,99(1):60-77

Because Roe v. Wade left ill-defined or derivative just who could be a medical caregiver for pregnant women, courts struggled in the post-Roe medico-legal environment to decide just who could be a medical advisor in this newly recognized zone of privacy. The courts also were challenged to balance individual privacy rights, state interest in health and potential life, and medical authority when dealing with alternative caregivers. This article examines five court cases involving traditional midwives in the 1970s in California and in the 1990s in New York. The cases afford the opportunity to examine emerging legal definitions of medical caregivers and the success or failure of certain forms of resistance to these definitions.  相似文献   

Learning to manage and managing to learn     

Rob Paton  Christina Lay 《Open Learning》2013,28(3):18-21

In this paper Fiona Reeve, Jim Gallacher and Terry Mayes of Glasgow Caledonian University, bring together two current themes in higher education, work‐based learning and the use of new technology in teaching and learning. The paper begins to explore their interaction by examining the ways in which new technology can help to overcome some of the barriers which exist to work‐based learning. To begin this analysis a general model of a WWW‐based learning resource is described which has relevance for a range of open learning contexts. A central aspect of this model is the use of communication technologies to promote the creation of learning dialogues. The way in which this general model might be applied to work‐based learning is then examined. Having suggested that such a model has much to offer work‐based learning, some of the constraints which might be encountered on implementation are then identified. Finally, the authors conclude that it is in promoting more and better forms of communication that new technology can contribute towards work‐based learning practice.  相似文献