Identification of histological threshold concepts in health sciences curricula: Students' perception

Students' metacognitive skills and perceptions are considered important variables for high-quality learning. In this study, students' perceptions were used to identify histological threshold concepts (integrative, irreversible, transformative, and troublesome) in three health sciences curricula. A specific questionnaire was developed and validated to characterize students' perceptions of histological threshold concepts. A sample of 410 undergraduate students enrolled in the dentistry, medicine, and pharmacy degree programs participated in the study. Concepts assessed in the study were clustered to ten categories (factors) by exploratory and confirmatory factor analysis. Concepts linked to tissue organization and tissue functional states received the highest scores from students in all degree programs, suggesting that the process of learning histology requires the integration of both static concepts related to the constituent elements of tissues and dynamic concepts such as stem cells as a tissue renewal substrate, or the euplasic, proplasic and retroplasic states of tissues. The complexity of integrating static and dynamic concepts may pose a challenging barrier to the comprehension of histology. In addition, several differences were detected among the students in different degree programs. Dentistry students more often perceived morphostructural concepts as threshold concepts, whereas medical students highlighted concepts related to two-dimensional microscopic identification. Lastly, pharmacy students identified concepts related to tissue general activity as critical for the comprehension and learning of histology. The identification of threshold concepts through students' perceptions is potentially useful to improve the teaching and learning process in health sciences curricula.     

Quantification of mercury in XVIII century books by Energy Dispersive X-Ray Fluorescence (EDXRF)

This work describes the quantitative analysis of mercury present in the ink used to colour some books of XVIII century. The mercury content was determined by Energy Dispersive X-ray Spectrometry. This is a non-destructive technique which allows elemental identification and quantification (Z > 13) by atomic physics processes. The organic pigments cannot be identified by this technique, taking into account that its composition is mainly C, O and H. Levels of 2 wt.% and 4.5 wt.% were measured in 1756 and 1753 books respectively. No significant amount of mercury was observed in other red books, on a total of 11, all from XVIII century: 1720, 1732, 1753, 1756, 1780, 1798, 1800. More than one book for each year were analysed. The studied books belong to a private collection, and were selected taking into account the age and the reddish colour of their external parts. High content on Fe were observed in some of the books. This work highlights the application of a physics technique in a very important aspect for art and cultural heritage conservation and restoration, considering that high levels of toxic elements might be found in ancient documents. It is of great importance that preliminary elemental analyses are performed on ancient documents before handling them, because they might constitute some danger for restorers, conservators and collectors. This work highlights, for the first time, the danger of some ancient books. They might contain a very high concentration of mercury, which is toxic for the organism. This is also a particularly important problem of public health never mentioned in literature before.     

A Combined Strategy of Additive Manufacturing to Support Multidisciplinary Education in Arts,Biology, and Engineering

This research presents results for the design and creation of supporting teaching materials using additive manufacturing. The materials are inspired by selected artwork of four animal species, which belong to a collection from the museum of the University of Antioquia. The topic selected was fauna in Colombia, and the animals in question were chosen based on important roles they have in areas like health, the environment, and food. These animals will complement science education given to several age groups visiting the museum. In addition to the 3D-manufactured objects, a study was conducted using several age groups that are very relevant to the museum: children, teenagers, and first year undergraduate students. A video showing technical information cards about the manufacturing process was also developed. This project was multidisciplinary, involving collaboration between the engineering school, the museum, and a local high school. The results showed that young visitors want complete information on the animals and to have interaction with the animal models, which is not always possible. This project serves as a local strategy not only for taking arts and knowledge out of the museum but also for planning first year courses in the university and thus reducing problems like school dropout, low motivation, and poor performance in national exams.

     

Reading development and dyslexia in a transparent orthography: a survey of Spanish children

Spanish-speaking children learn to read words printed in a relatively transparent orthography. Variation in orthographic transparency may shape the architecture of the reading system and also the manifestation of reading difficulties. We tested normally developing children and children diagnosed with reading difficulties. Reading accuracy was high across experimental conditions. However, dyslexic children read more slowly than chronological age (CA)-matched controls, although, importantly, their reading times did not differ from those for ability-matched controls. Reading times were significantly affected by frequency, orthographic neighbourhood size and word length. We also found a number of significant interaction effects. The effect of length was significantly modulated by reading ability, frequency and neighbourhood. Our findings suggest that the reading development of dyslexic children in Spanish is delayed rather than deviant. From an early age, the salient characteristic of reading development is reading speed, and the latter is influenced by specific knowledge about words.     

Writing processes in a shallow orthography

The aim of this study was to find out if the spelling models proposed to account for performance in languages with a deep orthography are applicable to a shallow orthography such as Spanish. For this reason, two experiments were carried out, one of lexical decision (in which subjects heard words and nonwords but only wrote down the nonwords) and the other a dictation in which the variables of grapheme frequency and lexical priming were manipulated. The results coincide with those found in the English language as in both experiments the two variables produced significant effects: the variable of grapheme frequency, which indicates the existence of a process of phonological spelling and the variable of lexical priming which indicates the existence of a lexical process.     

Development of word reading fluency along primary education: a six-year follow-up / El desarrollo de la fluidez en la lectura de palabras en educación primaria: un seguimiento longitudinal de seis años

Word reading fluency is a key component in the process of reading. In order to understand its acquisition it is crucial to conduct longitudinal studies. The aim of this work was to describe the development of word recognition in Spanish, considering accuracy and speed, from a longitudinal perspective. A group of 31 children were followed for six years. Reading performance was assessed with a list of 72 stimuli in which lexicality, frequency and length were manipulated. Results show that initial gains in reading accuracy occurred very rapidly. However, the growth of reading speed was found to be more difficult and complex, and automatic word recognition remains low at the end of Grade 6. Low frequency, long words were the most difficult stimuli. High stability in reading speed was observed and it was a relevant indicator that differentiates between good and poor readers. The findings also highlighted the need to develop training programs with the specific aim of improving word reading fluency throughout primary education.     

Language,high school leadership and the postsecondary outcomes of Hispanic students

This paper asks whether high school leadership activities play an important role in explaining the Hispanic college-completion gap. The analysis in this paper considers the role that English language fluency plays in a Hispanic student's leadership probability and in the student's future educational success. The main results in this paper are: first, after controlling for demographic and school characteristics, there are no major differences in high school leadership activities between Hispanics and non-Hispanics; second, high school leadership activities predict higher college attendance rates for all demographic groups; and third, high school leadership activities predict a higher probability of attaining a college degree among Hispanic students whose first language is not English. Importantly, this relationship is stronger among students whose first post-secondary institution is a 2-year college.     

Does blended instruction enhance English language learning in developing countries? Evidence from Mexico

Despite steady investment in English language education made by developing countries over the past few decades, results continue to be constrained by lack of high-quality instructors and language learning resources. Thus, using technology in language instruction has increasingly been recognized as a potential approach for addressing these constraints. This study uses administrative data from a large public university in Mexico to examine the impact of a technology-enhanced blended program on students' English course grades and course completion rates. Specifically, we focus on a campus-wide policy change in all compulsory English language courses that replaces half of the traditional face-to-face class time with an interactive online learning environment developed by a leading technology-mediated English language learning and assessment provider. Our results suggest that, compared to traditional face-to-face instruction, blended learning had a significant, positive impact on students' course grades and course completion rates. In addition, the enrollment-teacher ratio increased after replacing half of the face-to-face instructional time with online learning, suggesting that blended learning environments hold promise for providing high-quality and cost-effective language instruction.     

A Longitudinal Analysis of Gender Differences in Affective Outcomes in Mathematics During Middle and High School

This study examined gender differences in the rate of change in mathematics affect (attitude and anxiety toward mathematics and utility of mathematics) across middle and high school, using data from the Longitudinal Study of American Youth. Hierarchical linear models indicated no gender differences in the rate of decline in either attitude or utility, but females grew faster in anxiety than males. Schools were more responsible for variation in the male than female rate of change in mathematics affect. Student and school variables influenced the rate of change in mathematics affect in a quite different way between males and females.