The Development of Dalton’s Atomic Theory as a Case Study in the History of Science: Reflections for Educators in Chemistry

The inclusion of the history of science in science curricula—and specially, in the curricula of science teachers—is a trend that has been followed in several countries. The reasons advanced for the study of the history of science are manifold. This paper presents a case study in the history of chemistry, on the early developments of John Dalton’s atomic theory. Based on the case study, several questions that are worth discussing in educational contexts are pointed out. It is argued that the kind of history of science that was made in the first decades of the twentieth century (encyclopaedic, continuist, essentially anachronistic) is not appropriate for the development of the competences that are expected from the students of sciences in the present. Science teaching for current days will benefit from the approach that may be termed the “new historiography of science”.     

Letter names and sounds: their implications for the phonetisation process

Our aim was to analyse the impact of the characteristics of words used in spelling programmes and the nature of instructional guidelines on the evolution from grapho-perceptive writing to phonetic writing in preschool children. The participants were 50 5-year-old children, divided in five equivalent groups in intelligence, phonological skills and spelling. All the children knew the vowels and the consonants B, D, P, R, T, V, F, M and C, but didn’t use them on spelling. Their spelling was evaluated in a pre and post-test with 36 words beginning with the consonants known. In-between they underwent a writing programme designed to lead them to use the letters P and T to represent the initial phonemes of words. The groups differed on the kind of words used on training (words whose initial syllable matches the name of the initial letter—Exp. G1 and Exp. G2—versus words whose initial syllable is similar to the sound of the initial letter—Exp. G3 and Exp. G4). They also differed on the instruction used in order to lead them to think about the relations between the initial phoneme of words and the initial consonant (instructions designed to make the children think about letter names—Exp. G1 and Exp. G3—versus instructions designed to make the children think about letter sounds—Exp. G2 and Exp. G4). The 5th was a control group. All the children evolved to syllabic phonetisations spellings. There are no differences between groups at the number of total phonetisations but we found some differences between groups at the quality of the phonetisations.     

Detection of Catabacter hongkongensis in polluted European water samples

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.     

Do What Darwin Did

Science & Education - We argue that teleological thinking plays a central role in biology and, more specifically, in theory of natural selection, and, therefore, the didactic goal cannot be its...     

Phonological abilities and writing among portuguese preschool children

The objective of this study was to identify causal relationships between the development of phonological abilities and progress in writing in preschool children. The participants were 44 children, with an average age of 5 years and 6 months, and whose writing was syllabic with phonetization. The children were divided into three groups. They were subjected to a pre-test and a post-test that were intended to evaluate both their writing and their phonological skills. In between the two tests experimental group 1 underwent a writing training program designed to lead them to produce syllabic-alphabetic/alphabetic writing, while experimental group 2 was subjected to a phonological training program designed to work on phonetic units. The third group served as a control group. The number of letters known and the level of intelligence were controlled. The children in the two experimental groups achieved results that revealed a similar degree of progress (greater than the control group) in both their writing and their phonological abilities.     

Contracting race: writing,racism, and education

This article presents the main terms of the racial contract, as they appear in the subcontracts of Mills’ theory, such as the spatial, epistemological, cognitive subcontracts. It is important to keep in mind that these subcontracts are by no means separate and represent analytical moments of the main contract. Furthermore, other than its institutional form, education is not a separate sphere from the racial contract. Finally, I end with the racial contract’s gaps to determine the possibility of its own demise, which requires the active signing off from the terms of the contract. That is, I sketch ideas about ways to counteract (i.e., counter-write) the racial contract as part of a corrective to the history that interpellates people of color as its targets. Both Whites and people of color have a stake in the rewriting of the contract, where in the end they are imagined as neither Black nor White but free. In this last portion, I spend some text on what Whites’ role may look like in signing off the contract, such as the case of white ‘race traitors’ within the white abolitionist proposal, recast as the ‘epistemological traitor’ in education.     

Development and evaluation of a Portuguese early literacy programme / Desarrollo y evaluación de un programa portugués de alfabetización temprana

Abstract

Over the last three decades, research in this field has addressed different early literacy skills and studied the pedagogical practices that promote the initial learning of reading and writing skills. This study develops a programme that promotes early literacy skills, called Ouvir as Letras (Listen to the Letters). The efficacy of the programme was evaluated in comparison with two implementations of the Portuguese preschool education curriculum: one structured and the other semi-structured, in a quasi-experimental design with a pre-test, post-test and follow-up. The study was carried out with the participation of 124 five- and six-year-old children who attended preschool in four schools in the north of Portugal. The results suggest that the Ouvir as Letras programme was more effective in facilitating the acquisition of basic skills to initiate children in the learning of written language.