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Evdokimova Olga L. Alves Carla S. Krsmanović Whiffen Radenka M. Ortega Zaida Tomás Helena Rodrigues João 《Journal of Zhejiang University. Science. B》2021,22(6):450-461
In this study, the fibers of invasive species Agave americana L. and Ricinus communis L. were successfully used for the first time as new sources to produce cytocompatible and highly crystalline cellulose nanofibers. Cellulose nanofibers were obtained by two methods, based on either alkaline or acid hydrolysis. The morphology, chemical composition, and crystallinity of the obtained materials were characterized by scanning electron microscopy(SEM) together with energy-dispersive X-ray spectroscopy(EDX), dynamic light scattering(DLS), X-ray diffraction(XRD), and Fourier transform infrared(FTIR)spectroscopy. The crystallinity indexes(CIs) of the cellulose nanofibers extracted from A. americana and R. communis were very high(94.1% and 92.7%, respectively). Biological studies evaluating the cytotoxic effects of the prepared cellulose nanofibers on human embryonic kidney 293 T(HEK293 T) cells were also performed. The nanofibers obtained using the two different extraction methods were all shown to be cytocompatible in the concentration range assayed(i.e., 0-500 μg/mL). Our results showed that the nanocellulose extracted from A. americana and R. communis fibers has high potential as a new renewable green source of highly crystalline cellulose-based cytocompatible nanomaterials for biomedical applications. 相似文献
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This article, derived from a three-year ethnography of distributed medical education provision in a Canadian university, explores the ways in which information and communication technologies are used by teachers and students in their everyday work within technologically rich teaching environments. The environments being researched are two university campuses: a campus at the main university site and a satellite campus in a neighbouring province. The article seeks to contrast dominant, institutional discourses of technology use in higher education teaching with the everyday practices of staff and students. The article concludes that there is a gap between policy and practice in distributed education and that the teaching and learning experience and context of staff and students in different sites need to be analysed in depth, in terms of: whether the experience of learning across sites can be positioned as being comparable; the extent to which technology ameliorates learning and teaching; and understanding the work done by staff. 相似文献
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The usability of interactive whiteboards vs. computers was evaluated on three dimensions (visibility, legibility and comprehension) in the secondary school pupils. The visibility assessment consisted in detecting a visual stimulus varying in luminance using a staircase procedure, legibility was assessed with a target-search task, and we administered narrative and explanatory texts with or without illustrations to evaluate comprehension. The results of the visibility test showed that pupils found the light signal easier to detect on the IWB. For the legibility test, we observed differences in error rates and discriminability according to medium, font size and congruence between target and the distractor letters. Performances in the comprehension test were similar for both explanatory and narrative texts. Moreover, the presence of illustrations does not improve comprehension. These results could be related to the hierarchical structure of the texts, which facilitate comprehension. 相似文献
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Olga Denac 《Early Childhood Education Journal》2008,35(5):439-444
In the interaction between the child and the adult, interest can be a significant motivational initiator of activities. Systematic
monitoring and development of the interest in music activities enables the teachers to influence the preschool children in
forming a positive attitude towards the art of music. The research involving preschool teachers, children at the age of five
to six and their parents, was conducted in order to determine the interest of preschool teachers and children in music activities.
We found that the teachers showed greatest interest in singing songs, playing instruments and listening to music. The children’s
favourite activities in kindergarten were movement to music (dancing), singing songs and playing on instruments, namely activities
where they could take active part in the educational process. The parents reported that at home the children preferred most
to listen to music, to sing songs and move to the sounds of music, and less to play on instruments and to be creative in music.
The development of the children’s interest in music depends on the teachers’ expression of interest in music activities, on
the choice of music activities and music contents and on the experience in the music environment of the family. 相似文献
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Leonard A. Jason Karen E. Danner Andrew M. Weine Karen S. Kurasaki Jay H. Johnson Luann Warren-Sohlberg Olga Reyes 《Early education and development》1994,5(4):277-288
Two cohorts of children from inner-city elementary schools were provided a tutoring intervention to help in their transition to new schools. Participants were third, fourth, and fifth grade children who were identified as having low-income status, evidencing lags on achievement tests, and experiencing stressful life events. The intervention involved an orientation program with twice weekly paraprofessional tutoring. Two and three year academic and sociometric follow-up data were collected. Those provided the intervention evidenced some improvements over time, and these changes were most prominent in the area of reading grades. Fewer significant findings were found on sociometric indices. 相似文献
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Even though there are increasing numbers of PhD students in the distance mode, our current understanding of PhD candidature at a distance is limited and incomplete. On the one end of the spectrum are accounts of unhappy and isolated doctoral students who are separated from communities of practice. At the same time, literature offers accounts of PhD students at a distance who view themselves as agential and autonomous and are happy not to get sidetracked by others. In this reflection we ask what distinguishes the conventional PhD student from one who is studying at a distance, and invite more research on self-efficacy and vicarious learning of PhD students at a distance. 相似文献
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共工是中国古代神话传说中的传奇人物,或被认为是"王天下"的古帝,亦曾贬为治水不利的罪臣。共工蒙世之恶诟,其声名亦渐致寂寥。该文试以探求共工的真面目,从纷繁的古代神话传说中揭示上古社会思潮的变迁。 相似文献
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