Profiles of self-perceived competencies and conceptions of academic writing in university students / Perfiles de competencias y concepciones sobre la escritura académica en estudiantes universitarios     

Núria Castells  Mar Mateos  Elena Martín  Isabel Solé  Mariana Miras 《Cultura y Educación》2015,27(3):569-593

Abstract

This study analyses Spanish undergraduates’ perceptions of their competency in academic writing, as well as their perception of the criteria that define its quality. We identified student profiles and examined their relationship with (1) certain sample characteristics, such as years of university experience, area of study and students’ gender, and (2) variables related to the process of writing, namely the students’ perception of the writing process and the importance they attribute to its characteristics. The data obtained came from the European Writing Survey (EUWRIT) which was administered to 1,044 students from nine Spanish universities. Profiles were identified by means of k-means cluster analysis. The relationship between these profiles and the variables studied was examined by means of chi-squared analyses and univariate ANOVAs. Two profiles were identified: students who are confident about their writing skills and who acknowledge the importance of writing in their field of knowledge; and students who are relatively confident about their writing ability and who consider writing to be relatively important in their subject area.  相似文献   

Phaseguide-assisted blood separation microfluidic device for point-of-care applications     

Linfeng Xu  Hun Lee  Mariana Vanderlei Brasil Pinheiro  Phil Schneider  Deekshitha Jetta  Kwang W. Oh 《Biomicrofluidics》2015,9(1)

We propose a blood separation microfluidic device suitable for point-of-care (POC) applications. By utilizing the high gas permeability of polydimethylsiloxane (PDMS) and phaseguide structures, a simple blood separation device is presented. The device consists of two main parts. A separation chamber with the phaseguide structures, where a sample inlet, a tape-sealed outlet, and a dead-end ring channel are connected, and pneumatic chambers, in which manually operating syringes are plugged. The separation chamber and pneumatic chambers are isolated by a thin PDMS wall. By manually pulling out the plunger of the syringe, a negative pressure is instantaneously generated inside the pneumatic chamber. Due to the gas diffusion from the separation chamber to the neighboring pneumatic chamber through the thin permeable PDMS wall, low pressure can be generated, and then the whole blood at the sample inlets starts to be drawn into the separation chamber and separated through the phaseguide structures. Reversely, after removing the tape at the outlet and manually pushing in the plunger of the syringe, a positive pressure will be created which will cause the air to diffuse back into the ring channel, and therefore allow the separated plasma to be recovered at the outlet on demand. In this paper, we focused on the study of the plasma separation and associated design parameters, such as the PDMS wall thickness, the air permeable overlap area between the separation and pneumatic chambers, and the geometry of the phaseguides. The device required only 2 μl of whole blood but yielding approximately 0.38 μl of separated plasma within 12 min. Without any of the requirements of sophisticated equipment or dilution techniques, we can not only separate the plasma from the whole blood for on-chip analysis but also can push out only the separated plasma to the outlet for off-chip analysis.  相似文献   

The Role of Action Research in Fostering Culturally-Responsive Practices in a Preschool Classroom     

Mariana Souto-Manning  Christina Hanson Mitchell 《Early Childhood Education Journal》2010,37(4):269-277

Early childhood teachers and educational programs are expected to be the primary resources as children experience different and sometimes conflicting cultural contexts. Early educators can play a paramount role as young children move through fluid identities and start recognizing and navigating within and across spaces of cultural differences—e.g., between home cultures and the socially-dominant school culture. In this sense, we draw attention to a multi-year action research study, paying particular attention to the process whereby an early childhood teacher investigated, problematized, and challenged the nature of curriculum and practices in a diverse preschool classroom. We focus on the role of action research in fostering culturally-relevant teaching. As we do so, we analyze an early childhood teacher’s shifting perceptions of what it means to engage in culturally-relevant teaching, respecting and honoring cultural diversities.  相似文献   

Using the onto-semiotic approach to identify and analyze mathematical meaning when transiting between different coordinate systems in a multivariate context     

Mariana Montiel  Miguel R. Wilhelmi  Draga Vidakovic  Iwan Elstak 《Educational Studies in Mathematics》2009,72(2):139-160

The main objective of this paper is to apply the onto-semiotic approach to analyze the mathematical concept of different coordinate systems, as well as some situations and university students’ actions related to these coordinate systems. The identification of objects that emerge from the mathematical activity and a first intent to describe an epistemic network that relates to this activity were carried out. Multivariate calculus students’ responses to questions involving single and multivariate functions in polar, cylindrical, and spherical coordinates were used to classify semiotic functions that relate the different mathematical objects.  相似文献   

Detection of Catabacter hongkongensis in polluted European water samples     

Francesc Codony  Bárbara Adrados  Leonardo Martín Pérez  Mariana Fittipaldi  Jordi Morató 《Journal of Zhejiang University. Science. B》2009,10(12):867-869

The Catabacteriaceae is a new bacterial family with a unique member: Catabacter hongkongensis is a strictly anaerobic, non-sporulating, Gram-positive coccobacillus that is phylogenetically related to some clostridial clusters. Little is known of its epidemiology and environmental distribution, but the inclusion of its 16S rRNA gene sequence in GenBank has allowed it to be detected qualitatively. As a first approach for prospective surveys, a real-time polymerase chain reaction (PCR) procedure to identify C. hongkongensis has been developed. The presence of Catabacteriaceae in 29 water bodies subjected to possible human or animal impact has been investigated. Four of them were positive. The results confirm that highly polluted water can contain C. hongkongensis.  相似文献   

A brief history of family life education in Romania     

Mariana Momanu  Nicoleta Laura Popa 《Paedagogica Historica: International Journal of the History of Education》2018,54(3):266-286

Starting from the state of conceptual diversity, semantic ambiguity, and poor connection of family life education practices to current policies and theoretical models in Romania, our study aims at understanding the underlying meanings of these issues by recourse to the history of approaches in the field. To this purpose, we carried out a qualitative historical research, based on the thematic analysis of a set of educational works produced between the sixteenth century, when the first Romanian texts were written, and the present time. Primary historical sources are supplemented with reliable secondary sources, while the criteria used for the selection of texts were their relevance to family life education (FLE), and the notoriety of the works in the corresponding historical periods. As in western countries, the concept of FLE was coined in Romania at the beginning of the twentieth century, when the family education discourse was outlined, but the roots of the field can be traced even in the first printed texts. Although marked by strong moral and religious emphases during pre-modernity, FLE has entered the slow process of secularisation and evolved from the perspective of political, social, and moral reconstruction goals of modern Romania. However, FLE’s goals and contents were redefined during Communism, and the discrepancies between discourses, practices, and realities compromised the functionality of the pedagogical model promoted at the time. A unitary definition of FLE in relation to Romanian contemporary families’ needs requires reconciliation with historical, cultural, and educational premises, as well as a careful contextualisation of western models and practices.  相似文献   

The AGTR2 rs11091046 (A>C) polymorphism and power athletic status in top-level Brazilian athletes     

João Paulo Limongi França Guilherme  Mariana Sussi Silva  Rômulo Bertuzzi  Antonio Herbert Lancha Junior 《Journal of sports sciences》2018,36(20):2327-2332

The main purpose of this study was to investigate if the rs11091046 (A>C) polymorphism in AGTR2 gene is associated with athletic status in top-level athletes from Brazil. Since the AGTR2 gene is located on the X chromosome, the case-control association study was done separately for women and men. The female cohort was composed of 205 athletes and 241 non-athletes, and the male cohort was composed of 419 athletes and 490 non-athletes. We did not identify an association between the C-allele and the endurance phenotype. However, power athletes had a higher frequency of the A-allele. In women, A/A genotype was overrepresented in international-level power group compared with non-athletes or international-level endurance athletes (23.2% vs. 16.6% or 8.8%, respectively; p < 0.05). In men, the A-allele frequency observed in power athletes or international-level power athletes was statistically different from that observed in non-athletes (51.6% or 57.8% vs. 40.4%; p < 0.009). Furthermore, men sprinters with the A-allele showed significantly faster personal best times for the 100 m than those with the C-allele (10.56 ± 0.32 s vs. 10.93 ± 0.49 s; p < 0.02). In conclusion, it was found that the AGTR2 A-allele is a candidate genetic marker for top-level power athletes.  相似文献   

Student–Mentor Relationships and Students' College Attitudes     

Chenoa S. Woods  Mariana Preciado 《Journal of Education for Students Placed at Risk》2016,21(2):90-103

Many college and SAT preparation programs are designed to improve the postsecondary success of traditionally marginalized students. In addition to academic preparation, students' social and emotional preparation is important for the transition from high school to college. Mentors can serve as role models and supports to aid students in this development. Using student survey data and hierarchical linear modeling, this study examines the influences of student–mentor relationships within an SAT program setting on students' college attitudes. Results indicate that these relationships can positively influence students' college attitudes, particularly for students who have lower baseline SAT scores. Recommendations for future research and practice are provided.  相似文献   

Reliability and validity of Yo-Yo tests in 9- to 16-year-old football players and matched non-sports active schoolboys     

Susana C. A. Póvoas  Carlo Castagna  José M. C. Soares  Pedro M. R. Silva  Mariana V. M. F. Lopes 《European Journal of Sport Science》2016,16(7):755-763

The purpose of this study was to examine the test–retest reliability and construct validity of three age-adapted Yo-Yo intermittent tests in football players aged 9–16 years (n?=?70) and in age-matched non-sports active boys (n?=?72). Within 7 days, each participant performed two repetitions of an age-related intensity-adapted Yo-Yo intermittent test, i.e. the Yo-Yo intermittent recovery level 1 children's test for 9- to 11-year-olds; the Yo-Yo intermittent endurance level 1 for 12- to 13-year-olds and the Yo-Yo intermittent endurance level 2 test for 14- to 16-year-olds. Peak heart rate (HR_peak) was determined for all tests. The distance covered in the tests was 57% (1098?±?680 vs. 700?±?272?m), 119% (2325?±?778 vs. 1062?±?285?m) and 238% (1743?±?460 vs. 515?±?113?m) higher (p?≤?.016), respectively for football-trained than for non-sports active boys aged 9–11, 12–13 and 14–16 years. The typical errors of measurement for Yo-Yo distance, expressed as a percentage of the coefficient of variation (confidence interval), were 11.1% (9.0–14.7%), 10.1% (8.1–13.7%) and 8.5% (6.7–11.7%) for football players aged 9–11, 12–13 and 14–16 years, respectively, with corresponding values of 9.3% (7.4–12.8%), 10.2% (8.1–14.0%) and 8.5% (6.8–11.3%) for non-sports active boys. Intraclass correlation coefficient values for test–retest were excellent in both groups (range: 0.844–0.981). Relative HR_peak did not differ significantly between the groups in test and retest. In conclusion, Yo-Yo intermittent test performances and HR_peak are reliable for 9- to 16-year-old footballers and non-sports active boys. Additionally, performances of the three Yo-Yo tests were seemingly better for football-trained than for non-sports active boys, providing evidence of construct validity.  相似文献   

The Moon Investigation: Instructional Strategies for Elementary Science Methods     

Abell  Sandra  George  Melissa  Martini  Mariana 《Journal of Science Teacher Education》2002,13(2):85-100

Journal of Science Teacher Education -  相似文献