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The purpose of this study was to investigate whether conceptual change texts and laboratory experiments are effective in overcoming
misconceptions and whether the concepts were acquired permanently when these methods were utilized. In this study, we addressed
some topics from the “Matter and Change” unit in science and technology class of elementary 4th grade. Students from three
classes of an elementary school participated in the study (N = 104). Students’ misconceptions were determined by administering the “Matter Concept Test” before, immediately after and
13 weeks after the instructional period. The results of the study showed that both conceptual change texts and experiment
method were more successful than traditional instruction in overcoming the misconceptions and acquiring permanent knowledge.
However, there was not a significant difference between these two alternative approaches in terms of reducing the misconceptions. 相似文献
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The purpose of this study was to diagnose the misconceptions held by pre-service physics teachers about force and motion.
The secondary aim of the study was to detect whether misconceptions vary according to gender, educational level, and culture.
The study was conducted with 79 student-teachers attending to one of the largest faculties of education in Turkey. Force Concept
Inventory (FCI) was used to diagnose student-teachers’ misconceptions. FCI is a conceptual test consisting of 29 multiple
choice items. Each wrong choice for each question reflects a specific misconception about the force and motion concepts. Data
from the study was analyzed by using frequencies, t-test, and ANOVA for making comparisons according to gender and years of education. Results of the study showed that student-teachers
of physics hold very strong misconceptions about impetus and active force. No significant differences were found between male
and female students’ scores on the concept test. The results also showed that misconceptions about force and motion decreased
through the years of education. However, they did not disappear completely. Findings of the study are very similar to the
other research findings conducted on the subject in other countries. Student-teachers’ conceptions about Newton’s Third Law,
on the other hand, were significantly better than those observed in other research done in other countries such as the US
and Finland. 相似文献
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Müjgan Ercan Emi Deniz Akbulut Nihayet Bayraktar erif Ercan 《Biochemia medica : ?asopis Hrvatskoga dru?tva medicinskih biokemi?ara / HDMB》2021,31(3)
IntroductionThe current study aimed to assess the interference of in vitro haemolysis on complete blood count (CBC) using Abbott Alinity hq system, and to determine which haemolysis levels affect the reliability of sample results.Materials and methodsBlood samples obtained from 25 volunteers in K3-EDTA tubes were divided into four aliquots. The first aliquot was not subjected to any intervention. The second, third and fourth aliquots were passed through a fine needle 2, 4 and 6 times, respectively. Complete blood count was performed by multi-angle polarized scatter separation technology and haemolysis index (HI) was assessed from the plasma samples separated by centrifugation. Five groups were formed according to the HI values. The percentage biases between the results of non-haemolysed and haemolysed groups were compared with the desirable bias limits from The European Federation of Clinical Chemistry and Laboratory Medicine database and reference change values (RCVs).ResultsIn groups 1 to 4, the effects of haemolysis on CBC parameters were acceptable comparing to the analytical bias except for lymphocytes (7.26%-7.42%), MCH (2.59%), and MCHC (0.47%-2.81%). Results of group 5 (gross haemolysis) showed decreases in HCT(- 4.56%), RBC (- 4.07%) count and increase in lymphocyte (11.60%) count higher than the analytical performance specifications. Moreover, variations in MCH (4.65%) and MCHC (5.24%) were exceeding the RCVs.ConclusionsGross haemolysis (haemoglobin concentration > 10 g/L) is likely to produce unreliable CBC results on non-pathological samples. Further studies including pathological specimens are needed. 相似文献
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