Short Report： Cyclic patterns of incidence rate for skin malignant melanoma： association with heliogeophysical activity     

Dimitrov BD  Rachkova MI  Atanassova PA 《Journal of Zhejiang University. Science. B》2008,9(6):489-495

Background: Our previous studies revealed cyclicity in the incidence rate of skin malignant melanoma (SMM; ICD9, Dx: 172) in the Czech Republic (period T=7.50～7.63 years), UK (T=11.00 years) and Bulgaria (T=12.20 years). Incidences com-pared with the sunspot index Rz (lag-period dT= 2, 4, 6, 10 or 12 years) have indicated that maximal rates are most likely to appear on descending slopes of the 11-year solar cycle, i.e., out of phase. We summarized and explored more deeply these cyclic variations and discussed their possible associations with heliogeophysical activity (HGA) components exhibiting similar cyclicity. Methods: Annual incidences of SMM from 5 countries (Czech Republic, UK, Bulgaria, USA and Canada) over various time spans during the years 1964～1992 were analyzed and their correlations with cyclic Rz (sunspot number) and aa (planetary geomagnetic activity) indices were summarized. Periodogram regression analysis with trigonometric approximation and phase-correlation analysis were applied. Results: Previous findings on SMM for the Czech Republic, UK and Bulgaria have been validated, and cyclic patterns have been revealed for USA (T=8.63 years, P<0.05) and Canada (Ontario, T=9.91 years, P<0.10). Also, various 'hypercycles' were established (T=45.5, 42.0, 48.25, 34.5 and 26.5 years, respectively) describing long-term cyclic incidence patterns. The association of SMM for USA and Canada with Rz (dT= 6 and 7 years, respectively) and aa (dT=-10 and 9 years, respectively) was described. Possible interactions of cyclic non-photic influences (UV irradiation, Schumann resonance signal, low-frequency geomagnetic fluctuations) with brain waves absorbance, neuronal calcium dynamics, neuro-endocrine axis modulation, melatonin/serotonin disbalance and skin neuro-immunity impairment as likely causal pathways in melanoma appearance, were also discussed. Conclusion: The above findings on cyclicity and temporal association of SMM with cyclic environmental factors could not only allow for better forecasting models but also lead to a better understanding of melanoma aetiology.  相似文献   

Education of deaf students in Spain: legal and educational politics developments     

Fernández-Viader Mdel P  Fuentes M 《Journal of deaf studies and deaf education》2004,9(3):327-332

This article examines the legal instruments and educational politics affecting deaf persons' educational rights in Spain. We present a historical view of deaf education in Spain before and after the Congress of Milan (1880) and then introduce educational legislation and practices in recent decades. At present, Spanish legislation is moving toward recognition of sign languages and the suitability of bilingual education for deaf students at all educational levels. This is a consequence of taking into account the low academic achievement of two generations of deaf students educated in a monolingual model. Bilingual projects are now run throughout Spain. We emphasize that efforts must be made in the legal sphere to regulate the way in which professionals who know sign language and Deaf culture-teachers, interpreters, deaf adult models-are incorporated in bilingual deaf schools.  相似文献   

Age is more than just a number! The role of age and maturity in the processes leading to early school leaving in Flanders (Belgium)          下载免费PDF全文

Lore Van Praag  Rut Van Caudenberg  Mariana Orozco 《British Educational Research Journal》2018,44(4):557-572

In many educational systems, age is used as a criterion to organise education. Children's age is used to group students together and indicate entry into particular programmes. The use of age for organisational purposes in education stems from the idea that age provides an indication of the development of children, which is associated with teaching and learning. However, more far‐reaching consequences of age‐related educational practices are insufficiently recognised in policy and academic research. Qualitative methods are used to study students and school personnel in diverse types of educational institutions in Flanders (Belgium) to assess how age and age‐related issues matter for the students’ educational trajectories and educational decision‐making processes leading to early school leaving. Data analyses reveal that school staff members consider age and perceived maturity during evaluation procedures. Students also consider age during educational decision‐making processes: when getting older or being too old for the grade, students increasingly weigh the costs and benefits associated with getting an educational qualification and being enrolled in school and alternative opportunities. Students’ expectations related to age shape their school experiences and feelings of belonging. The findings of this study demonstrate how these educational practices add to the reproduction of inequalities through education. These results could inform debates concerning the evaluation procedures in secondary education, compulsory education and the reduction of early school leaving in Europe.  相似文献   

Innovation in teacher education: towards a critical re-examination     

Viv Ellis  Mariana Souto-Manning  Keith Turvey 《师资教育杂志》2019,45(1):2-14

ABSTRACT

In the course of introducing a themed issue of the journal on “Innovation in Teacher Education’, we lay out an argument for re-examining the meaning of innovation in the field, shifting it away from the dominance of the economistic and technological. Acknowledging its status as a ‘buzzword’, we distinguish between purposes for innovation and, in particular, between changes driven by arguments for social mobility and those driven by social justice and equity. Two imperatives for innovation underpinned by arguments for social justice and equity are identified: the concept of a ‘teacher education debt’, built on Ladson-Billings’ more general notion of ‘education debt’; and the humanization of learning, teaching and becoming a teacher as person-centred, relational practices. The final section of the article introduces each of the six papers in the context of the discussion in previous sections about these imperatives for change.  相似文献   

Conceptual Variation in the Depiction of Gene Function in Upper Secondary School Textbooks     

Niklas Markus Gericke  Mariana Hagberg 《Science & Education》2010,19(10):963-994

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The effects of resistance training volume on osteosarcopenic obesity in older women     

Paolo M. Cunha  Alex S. Ribeiro  Crisieli M. Tomeleri  Brad J. Schoenfeld  Analiza M. Silva  Mariana F. Souza 《Journal of sports sciences》2018,36(14):1564-1571

The aim of this study was to analyze the effects of resistance training (RT) performed with 1 or 3 sets per exercise on osteosarcopenic obesity (OSO) syndrome parameters in older women. Sixty-two older women (68.0 ± 4.3 years, 26.8 ± 4.4 kg/m²) participated in a 12-week RT program. Participants were randomly assigned into one of the three groups: two training groups that performed either 1 set (G1S, n = 21) or 3 sets (G3S, n = 20) 3 times weekly, or a control group (CG, n = 21). Body composition was assessed by dual X-ray absorptiometry, strength was evaluated by 1 repetition maximum testing. The G3S presented significantly higher strength changes than G1S. The changes for percentage of body fat were higher for G3S compared to G1S. There was no difference in skeletal muscle mass between G3S and G1S, however both training groups displayed greater increases in this outcome compared to CG. There was no effect for bone mineral density. The overall analysis indicated higher (P < 0.05) positive changes for G3S than G1S (composed Z-score: G3S = 0.62 ± 0.40; G1S = 0.11 ± 0.48). The results suggest that a 12-week RT period is effective to improve the risk factors of OSO, and that 3 sets induce higher improvements than a single set.  相似文献   

The continuous nature of timing reprogramming in an interceptive task     

Luis Augusto Teixeira  Elke Dos Santos Lima  Mariana Marília Franzoni 《Journal of sports sciences》2013,31(9):943-950

The time course of movement timing reprogramming was examined in a task requiring temporal coincidence of the conclusion of a forehand drive with the arrival of a moving luminous target at the end of an electronic trackway. The moving target departed from one end of the trackway at a constant velocity of 2?m ^. s^?1, and for a part of the trials its velocity was increased to 3?m ^. s^?1. Target velocity was modified at different moments during stimulus displacement, producing times-to-arrival after velocity increment (TAVIs) from 100 to 600?ms. The effect of specific practice on movement reprogramming was also examined. The results showed early adjustments to the action (TAVIs = 100?–?200?ms) that seemed to be stereotyped, while feedback-based corrections were implemented only at TAVIs of 300?ms or longer. Temporal accuracy was progressively increased as longer TAVIs were provided up to 600?ms. Skill training led to an overall increment of temporal accuracy, but no effect of specific practice was found. The results indicate that timing reprogramming in interceptive actions is a continuous process limited mainly by intrinsic factors: latency to initiate more effective adjustments to the action, and rate-of-movement timing reprogramming.  相似文献   

Participation in sports in childhood and adolescence and physical activity in adulthood: A systematic review     

Mariana Biagi Batista  Catiana Leila Possamai Romanzini  Cynthia Correa Lopes Barbosa  Gabriela Blasquez Shigaki  Marcelo Romanzini  Enio Ricardo Vaz Ronque 《Journal of sports sciences》2013,31(19):2253-2262

ABSTRACT

The aim of this study was to systematically review the literature to verify the association between participation in sports (PS) in childhood and adolescence and physical activity (PA) in adulthood. A systematic search was conducted in the following databases: Medline (PUBMED), Web of Science, Scopus, and SPORTDiscus, LILACS and SciELO. All steps of the process followed the recommendations of the PRISMA FlowDiagram. After all the steps of the process, 29 articles were included for analysis. In general, only three of the studies analyzed found no relation between PS in childhood and adolescence and PA in adulthood. However, a positive relationship was found to be weak in only 7% of the studies, a moderate relation in 62% of the studies, and a strong relation in 21%. It was found that higher weekly frequencies of PS; persistence of at least three years of PS and, finally, the highest level of practice and/or competition reached were related to higher levels of PA in adulthood. Thus, it can be concluded that there is a positive association considered moderate to strong between PS in childhood and adolescence and PA in adulthood.  相似文献   

The role of conceptual conflict in conceptual change and the design of science instruction   总被引：9，自引：0，他引：9  

Peter W. Hewson  Mariana G. A'Beckett Hewson 《Instructional Science》1984,13(1):1-13

Conceptual conflict has long been recognized as a factor that could facilitate student learning. Due, however, to the lack of a convincing explanation of why it occurs, and how it can be resolved, it has seldom been used in instructional design. Its potential use in instruction is particularly relevant in the light of the recent, well-documented finding that students' existing conceptions frequently constitute a barrier to effective learning. This article examines conceptual conflict in the light of an epistemological model of learning as conceptual change. This analysis shows that the conceptual change model provides an explanation of conceptual conflict which is sufficiently detailed to allow it to be used in the design of instruction. The results of two studies, the first of which addressed the concepts of mass, volume, and density, and the second, the concept of speed, show that instruction, designed in this way, is effective in changing students' existing conceptions.  相似文献   

The state and higher education in Colombia     

Ricardo Lucio  Mariana Serrano 《Higher Education》1993,25(1):61-72

The development of higher education in Colombia is discussed in terms of its recent quantitative expansion and the accompanying qualitative differentiation. Beginning in 1980 with the University Reform of that year, the state sought to give shape to the system by policies intended (i) to improve its organization (ii) to expand it on more democratic lines and (iii) to improve its quality. The authors discuss the developments which marked attempts to implement these aims. Two critical policy areas emerged—the funding of the system and the administration of the public sector part of it. Current debates are analysed and the authors provide pointers to possible future developments including the development of a highly stratified system with little interaction between the top and the bottom.  相似文献