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排序方式: 共有97条查询结果,搜索用时 31 毫秒
81.
Effect of physiological harvest stages on the composition of bioactive compounds in Cavendish bananas 总被引:1,自引:0,他引:1
Christelle Bruno Bonnet Olivier Hubert Didier Mbeguie-A-Mbeguie Dominique Pallet Abel Hiol Max Reynes Patrick Poucheret 《Journal of Zhejiang University. Science. B》2013,14(4):270-278
The combined influence of maturation, ripening, and climate on the profile of bioactive compounds was studied in banana (Musa acuminata, AAA, Cavendish, cv. Grande Naine). Their bioactive compounds were determined by the Folin-Ciocalteu assay and high-performance thin layer chromatographic (HPTLC) method. The polyphenol content of bananas harvested after 400 degree days remained unchanged during ripening, while bananas harvested after 600 and 900 degree days exhibited a significant polyphenol increase. Although dopamine was the polyphenol with the highest concentration in banana peels during the green developmental stage and ripening, its kinetics differed from the total polyphenol profile. Our results showed that this matrix of choice (maturation, ripening, and climate) may allow selection of the banana (M. acuminata, AAA, Cavendish, cv. Grande Naine) status that will produce optimal concentrations of identified compounds with human health relevance. 相似文献
82.
Olivier Bégin-Caouette Véronique Angers Kimon Niflis 《Community College Journal of Research & Practice》2013,37(6):568-583
International experience is said to promote students’ intercultural sensitivity, employability and academic achievement; yet few community college students go abroad during their studies. This study aims to identify which organizational strategies are related to the participation rate in study abroad programs (SAPs). Taking the case of Quebec general and vocational colleges (CEGEPs [collèges d’enseignement general et professionnel]), a group-frequency analysis was performed on data obtained through a survey to which 39 CEGEPs responded (81% of the population). Using Knight’s (1999, 2004) terminology of organizational strategies, findings reveal that institutions with higher participation rates use four strategies to a greater extent: institutional commitment towards internationalization; educative mission statement referring to SAPs; international offices; and funding offered to students who participate in SAPs. A standard regression confirms that commitment and funding are positively correlated with student participation rates. 相似文献
83.
Olivier Girard Franck Brocherie Jean-Benoit Morin Grégoire P. Millet 《Journal of sports sciences》2016,34(12):1190-1198
We determined if performance and mechanical running alterations during repeated treadmill sprinting differ between severely hot and hypoxic environments. Six male recreational sportsmen (team- and racket-sport background) performed five 5-s sprints with 25-s recovery on an instrumented treadmill, allowing the continuous (step-by-step) measurement of running kinetics/kinematics and spring-mass characteristics. These were randomly conducted in control (CON; 25°C/45% RH, inspired fraction of oxygen = 20.9%), hot (HOT; 38°C/21% RH, inspired fraction of oxygen = 20.9%; end-exercise core temperature: ~38.6°C) and normobaric hypoxic (HYP, 25°C/45% RH, inspired fraction of oxygen = 13.3%/simulated altitude of ~3600 m; end-exercise pulse oxygen saturation: ~84%) environments. Running distance was lower (P < 0.05) in HOT compared to CON and HYP for the first sprint but larger (P < 0.05) sprint decrement score occurred in HYP versus HOT and CON. Compared to CON, the cumulated distance covered over the five sprints was lower (P < 0.01) in HYP but not in HOT. Irrespective of the environmental condition, significant changes occurred from the first to the fifth sprint repetitions (all three conditions compounded) in selected running kinetics (mean horizontal forces, P < 0.01) or kinematics (contact and swing times, both P < 0.001; step frequency, P < 0.001) and spring-mass characteristics (vertical stiffness, P < 0.001; leg stiffness, P < 0.01). No significant interaction between sprint number and condition was found for any mechanical data. Preliminary evidence indicates that repeated-sprint ability is more impaired in hypoxia than in a hot environment, when compared to a control condition. However, as sprints are repeated, mechanical alterations appear not to be exacerbated in severe (heat, hypoxia) environmental conditions. 相似文献
84.
Keyne Charlot Paul Zongo Anthony Scott Leicht Olivier Hue Olivier Galy 《Journal of sports sciences》2016,34(4):379-388
Physiological responses (intensity and recovery kinetics) and well-being indices were examined during a 4-day FIFA international tournament. Ten outfield New Caledonian players (age: 25.5 ± 3.8 years; height: 170 ± 7 cm; weight: 70.7 ± 8.6 kg) were assessed during the four matches. Players’ aerobic and anaerobic capacities were measured before the tournament while heart rate (HR), intra-matches recovery and well-being indices (Hooper index) were measured throughout the tournament. HR (168 ± 8 bpm), exercise intensity (83.4 ± 2.3% of HR reserve) and recovery indices were similar throughout the tournament. Well-being indices were largely alike during the tournament while rating of perceived exertion increased throughout the tournament that was not associated with HR or well-being indices. High aerobic and anaerobic capacities were associated with high match intensities and slow recovery indices. In summary, match intensity assessed by HR, recovery kinetics and well-being of Oceanian futsal players were not modified during a 4-day FIFA futsal tournament. Assessment of aerobic and anaerobic capacities may be useful to select players for optimal performance during this type of international tournament. 相似文献
85.
86.
The purpose of this study was to examine the redundancy effects obtained when spoken information was duplicated in writing during the learning of a multimedia document. Documents consisting of diagrams and spoken information on the development of memory models were presented to three groups of students. In the first group, no written text was presented. In the second, written sentences redundant with the spoken information were progressively presented on the screen while in the third group, these written sentences were presented together. The results show that whatever the type of text presentation (sequential or static), the duplication of information in the written mode led to a substantial impairment in subsequent retention and transfer tests as well as in a task in which the memorization of diagrams was evaluated. This last result supports the hypothesis that the visual channel is overloaded as the cognitive theory of multimedia learning suggests. 相似文献
87.
AbstractAs the Professional Learning Community (PLC) process becomes embedded within schools, the level of district support has a direct impact on whether schools have the ability to re-culture and sustain highly effective collaborative practices. The purpose of this article is to share a professional learning community conceptual framework from the US, and to highlight recent findings relating to district level support for the PLC process in schools. The professional learning community conceptual model is organized around five dimensions: shared and supportive leadership, shared values and vision, collaborative learning and application, shared personal practice, and supportive conditions. The overarching question guiding this qualitative research study is: How do school district personnel (central office staff) support schools in the professional learning community process? Findings reveal the importance of transformative and proactive district involvement, and the use of transparency, trust, accountability, and autonomy in school re-culturing. It was also found that developing leadership capacity, embedding professional development, and focusing the culture on student success were critically important. As districts provide support for the PLC dimensions and themes, school leaders will have a foundation of curricular strategies, collaborative skills, and necessary resources to serve teachers and students through continuous school improvement. 相似文献
88.
Christelle Devos Gentiane Boudrenghien Nicolas Van der Linden Assaad Azzi Mariane Frenay Benoit Galand Olivier Klein 《European Journal of Psychology of Education - EJPE》2017,32(1):61-77
A central trend in qualitative studies investigating doctoral students’ dropout is to stress the importance of students’ integration and socialisation in their working environment. Yet, few of these studies actually compared the experiences of doctoral students who completed or quit their PhD. In order to overcome this limitation and identify the factors that differentiate these two groups, the present study interviewed 21 former doctoral students: 8 completers and 13 non-completers. The results show that what best differentiates these two groups of participants is the extent to which they feel that they are moving forward, without experiencing too much distress, on a research project that makes sense to them. We assume that this set of factors is central in the dropout process. Support from doctoral peers was found to play a positive role overall but did not contribute to differentiating the two groups, presumably because peers have a limited impact on dissertation progress. Supervisors’ support was central to the participants’ stories; it is thus assumed to play a role in the process, but this role is complex and needs further investigation. These results call for a stronger consideration of the doctoral task itself when investigating the process of persistence and attrition and for a more integrated framework that considers jointly both task- and environment-related aspects. 相似文献
89.
Steve Olivier 《Quest (Human Kinetics)》2013,65(3):196-204
Maltreatment of subjects has led to the introduction of an ethics review process for research involving humans. There is a feeling that the bureaucratization of the process is too restrictive and that it may be hampering research. The function, duties, and effectiveness of ethics committees are examined, and it is contended that there are problems with the way that committees operate. The remit of committees needs to be clarified, and the paper presents guidelines for making decisions on ethical matters, with deontological considerations taking precedence over consequentialist ones. It is concluded that the functions and processes of ethics committees need to be modified. 相似文献
90.