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Carlo Tarsitani 《Interchange》1996,27(1):23-40
As the scientific change problem is at the center of epistemological research, the conceptual change problem is widely discussed in didactical research. In this paper common features of both problems will be discussed. Recent ideas on the role of analogies and metaphors in the growth of scientific knowledge are analyzed in order to show their relevance for scientific education problems. These ideas are also confronted with the image of scientific learning put forward by pedagogical and epistemological constructivism. In this perspective, the analysis of Maxwell's views about metaphors and analogies seems to give a deeper insight as to the problem of scientific change and scientific abstraction which still require clarification in educational and epistemological reflection. 相似文献
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Maurizio Fanchini Carlo Castagna Aaron J. Coutts Federico Schena Alan McCall Franco M. Impellizzeri 《Journal of sports sciences》2014,32(20):1950-1957
AbstractThe aim of this study was to compare the reliability, internal responsiveness and interchangeability of the Yo-Yo intermittent recovery test level 1 (YY1), level 2 (YY2) and submaximal YY1 (YY1-sub). Twenty-four young soccer players (age 17 ± 1 years; height 177 ± 7 cm; body mass 68 ± 6 kg) completed each test five times within pre- and in-season; distances covered and heart rates (HRs) were measured. Reliability was expressed as typical error of measurement (TEM) and intraclass correlation coefficient (ICC). Internal responsiveness was determined as effect size (ES) and signal-to-noise ratio (ESTEM). Interchangeability was determined with correlation between training-induced changes. The TEM and ICC for distances in the YY1 and YY2 and for HR in YY1-sub were 7.3% and 0.78, 7.1% and 0.93 and 2.2% and 0.78, respectively. The ESs and ESTEMs were 0.9 and 1.9 for YY1, 0.4 and 1.2 for YY2 and ?0.3 and ?0.3 for YY1-sub. Correlations between YY1 vs. YY2 and YY1-sub were 0.56 to 0.84 and ?0.36 to ?0.81, respectively. Correlations between change scores in YY1 vs. YY2 were 0.29 and ?0.21 vs. YY1-sub. Peak HR was higher in YY1 vs. YY2. The YY1 and YY2 showed similar reliability; however, they were not interchangeable. The YY1 was more responsive to training compared to YY2 and YY1-sub. 相似文献
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Julie A. Bianchini 《Cultural Studies of Science Education》2011,6(4):871-882
In this response to Konstantinos Alexakos, Jayson K. Jones, and Victor H. Rodriguez’s study, I discuss ways attending to student
membership in groups can both inform research on equity and diversity in science education and improve the teaching of science
to all students. My comments are organized into three sections: how underrepresented students’ experiences in science classrooms
are shaped by their peers; how science teachers can help students listen to and learn from one another; and how the subject
matter can invite or discourage student participation in science. More specifically, I underscore the need for teachers and
students to listen to one another to promote student learning of science. I also highlight the importance of science education
researchers and science teachers viewing students both as individuals and as members of multiple groups; women of color, for
example, should be understood as similar to and different from each other, from European American women and from ethnic minorities
in general. 相似文献
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Luigi M Castello Sophie Negro Francesca Santi Isabella Zanotti Matteo Vidali Marco Bagnati Giorgio Bellomo Gian Carlo Avanzi 《Biochemia medica : ?asopis Hrvatskoga dru?tva medicinskih biokemi?ara / HDMB》2012,22(3):380-384
Introduction:
Two Italian adults arrived at the Emergency Department referring diarrhea, nausea and vomiting for 4 days; weakness, fatigue and visual hallucinations were also complained of. Patients reported the ingestion of some leaves of a plant, which they supposed to be “donkey ears”, a week before. Physical examination showed hypotension and bradycardia and ECG examination disclosed sinus rhythm and repolarization abnormalities (scooping of the ST-T complex) in both patients and a 2:1 AV block in the man.Materials and methods:
Digoxin concentration was evaluated twice for each patient (at the admission and after 4 hours) by the automated immunoassay system ADVIA Centaur®. Digitoxin concentration was evaluated by liquid chromatography-mass spectrometry (LC-MS/MS).Results:
Despite clinical picture was suggestive of digitalis intoxication, digoxin levels were undetectable. Due to the more severe clinical picture, the male patient was treated with anti-digoxin antibodies (Digifab®) achieving a good clinical improvement and remission of the AV block within two hours. Initial diagnosis was confirmed by LC-MS/MS showing high digitoxin concentrations, but digoxin was undetectable. Patients remained stable and 48 hours later were discharged from the hospital.Conclusion:
Whereas digoxin determination frequently relies on monoclonal antibodies which do not cross-react to digitoxin, polyclonal antibodies constituting Digifab® recognize a large spectrum of cardiac glycosides, including digitoxin. This report emphasizes the primary role of the clinical approach to patients in the emergency setting and how an active communication and a continuous sharing of professional experiences between Laboratory and Clinicians ensure an early and correct diagnosis. 相似文献10.
The Obama administration campaigned on the platform of increased transparency and access to government information after the limitations of the Bush years. As part of this focus on transparency, the Obama administration is emphasizing the use of e-government and new social media services to open up access to government. This paper explores the considerations and challenges of this approach, such as the inclusion of members of the public with limited access to the internet, the use of non-governmental channels to disseminate government information, the permanence of digital-born government information, and the design of e-government. 相似文献