Conceptual Incoherence as a Result of the use of Multiple Historical Models in School Textbooks

This paper explores the occurrence of conceptual incoherence in upper secondary school textbooks resulting from the use of multiple historical models. Swedish biology and chemistry textbooks, as well as a selection of books from English speaking countries, were examined. The purpose of the study was to identify which models are used to represent the phenomenon of gene function in textbooks and to investigate how these models relate to historical scientific models and subject matter contexts. Models constructed for specific use in textbooks were identified using concept mapping. The data were further analyzed by content analysis. The study shows that several different historical models are used in parallel in textbooks to describe gene function. Certain historical models were used more often then others and the most recent scientific views were rarely referred to in the textbooks. Hybrid models were used frequently, i.e. most of the models in the textbooks consisted of a number of components of several historical models. Since the various historical models were developed as part of different scientific frameworks, hybrid models exhibit conceptual incoherence, which may be a source of confusion for students. Furthermore, the use of different historical models was linked to particular subject contexts in the textbooks studied. The results from Swedish and international textbooks were similar, indicating the general applicability of our conclusions.     

Quantification of Helicobacter pylori levels in soil samples from public playgrounds in Spain

Helicobacter pylori are ubiquitous Gram-negative bacteria with a high estimated level of infection in the world populations, but a majority of the infected persons are asymptomatic. This pathogen has been classified by the World Health Organization as a class I carcinogen and recognized as the causal agent of most peptic ulcers and chronic gastritis that might lead to stomach cancer. Although not all the transmission pathways of these bacteria into humans have been properly identified, enough data have suggested that the oral-oral or fecal-oral ones are the main infection routes. Helicobacter pylori have been detected in non-treated water and in drinking water, which suggested that water might be an important infection source. As childhood is the critical period of infection, the aim of the present work was to examine the presence of Helicobacter pylori in soil samples from public playing areas of Spanish parks.     

Argumentation-teaching as a method to introduce indigenous knowledge into science classrooms: opportunities and challenges

An innovative school science curriculum in South Africa requires the inclusion of African societal/cultural knowledge, such as indigenous knowledge (IK). The main project involves introducing argumentation to accomplish this requirement. We used a focus group plus critical incident technique to ascertain nine teachers’ understandings of argumentation and IK, their perceptions of how argumentation helps in teaching IK, examples of how argumentation-teaching had (or had not) worked in their classrooms, and their suggestions. Our results show that the teachers accepted argumentation as a viable approach to teach science and introduce IK into their classrooms.     

Laboratory professionals’ attitudes towards ISO 15189:2012 accreditation: an anonymous survey of three Croatian accredited medical laboratories

IntroductionEffective implementation and continual compliance with ISO 15189:2012 require ongoing commitment and active involvement of laboratory staff. Our aim was to assess attitudes regarding accreditation implementation by conducting a survey in three Croatian accredited medical laboratories.Materials and methodsAn anonymous survey consisting of 34 questions was distributed either electronically or in a paper form a week prior to scheduled annual audits. Distributions of answers regarding age, work experience, laboratory workplace, and education level and according to the respective laboratory were compared.ResultsThe overall response rate was 76% (225/297). Preference towards working in an accredited laboratory and a positive attitude were revealed by 70% and 56% participants, respectively, with better process documentation as the main advantage. Only 14% of responders considered themselves completely familiar with ISO 15189:2012. Total of 68% of responders felt that accreditation increases the usual workload, with excessive paperwork as the main contributor. Half of the responders declared partial agreement that accreditation requirements and expectations were clearly explained and claimed that their suggestions were taken into account only occasionally, which was especially emphasized by technical staff. The vast majority (89%) completely follow the prescribed protocols. Only 27% consider turnaround time monitoring useful. Competence assessment is considered efficient by 41% of responders. The majority (73%) prefer an online audit in times of COVID-19.ConclusionsDespite an overall positive attitude towards accreditation, further efforts are needed in providing better education about ISO 15189:2012 for technical staff and modifying formats of competence assessment, in order to achieve better adherence to ISO 15189:2012 requirements.     

Plasticity of altruistic behavior in children

The present study investigates the plasticity of altruistic behavior in children, analyzing the effect of a short intervention on 6- to 7-year-olds. After a 10-session intervention performed in a school context, altruism significantly increased. The intervention, which included relaxation practices, cooperative activities and emotional security priming, positively modulated altruistic behavior in children, beyond reciprocation and reputation. The experiences of collaborating, feeling emotional security and attaining moments of relaxation increased participants’ awareness of themselves and of others, favoring the emergence of intrinsic altruism. These results are in line with our hypothesis that altruism is an embodied human resource, highly susceptible to experience within social contexts.     

When inclusion excludes: a counter narrative of open online education

Open education aspires to democratize education, promote inclusion and effect change through social justice. These aspirations are difficult to realize in open, online environments, which enable multiple, and often conflicting, perspectives. This paper proposes a counter-narrative that surfaces certain operational norms of the internet and foregrounds their exclusionary nature. We offer an illustrative inventory of some social media interactional patterns to examine communication used in open online education communities. This examination leads us to conclude that language online is subject to a dialectical tension that both includes and excludes. We conclude that a different language is needed in open online educational environments; one that embraces exclusionary structures and strategic ambiguity, as well as the aspirations to further democratize education via digital means.     

Innovation and network multiplexity: R&D and the concurrent effects of two collaboration networks in an emerging economy

This study focuses on the multiplexity of firm R&D networks, and it investigates two types of boundary-spanning networks: the bipartite network between firms and government-sponsored institutions (GSIs), and the traditional firm–firm network. We apply a social network perspective to examine the effects that these kinds of networks have on firm innovativeness, in relation to the effects of the firm’s internal R&D efforts. We define the firm-GSI network as bipartite, and we investigate how the structural characteristics of this network (cohesion and centrality) affect innovativeness. We then decompose the innovational effects of firm–firm networks into two categories (intra- and inter-sector) to distinguish the effects of these collaboration networks. Furthermore, we investigate how these various external collaborative networks interact with a firm’s internal R&D efforts for driving innovativeness. Our empirical study of 420 manufacturing firms in Mexico evaluates evidence from surveys and secondary data. The findings indicate that the structural properties of both firm–GSI and firm–firm networks have positive effects on innovativeness, but firm–GSI network cohesion has a stronger negative interaction with R&D in influencing firm innovativeness. Moreover, intra-sector centrality in a firm–firm network has a stronger negative interaction with R&D than inter-sector centrality does in driving firm innovativeness. We contribute to the literature by integrating insights from the perspectives of network multiplexity, social embeddedness, and resource complementarity in regard to inter-organizational behavior. Our study also provides meaningful guidelines for both managers and policy makers. The study’s findings are robust to concerns of common method bias and alternative model specifications.     

A case of cooperation in the European OR education

European cooperation is a relevant subject that contributes to building a competitive network of high education institutions. A case of teacher mobility on behalf of the Erasmus programme is presented: it considers some Operations Research topics and the development of the Lego on My Decision module. The module considers eight lecture hours in four sessions: (i) the introductory session, to focus on the basics of computational linear algebra, linear programming, integer programming, with computational support (Excel®); (ii) the interim session, to address modelling subjects in a drop by-session; (iii) the advanced session, on the sequence of (i), to consider uncertainty and also how to use multi-criteria decision-making methods; (iv) the final session, to perform the evaluation of learning outcomes. This cooperation at European level is further exploited, including curricula normalisation and adjustments, cultural exchanges and research lines sharing in the idea of promoting the mobility of students and faculty.     

Crosscutting concepts and achievement: Is a sense of size and scale related to achievement in science and mathematics?

This study examined the relationship between students' (N = 229) concepts of size and scale and students' achievement in science and mathematics over a 3-year period. Size and scale are considered one of the big ideas in science that permeates disparate science and mathematics content areas, yet little is known about the relationship between students' conceptualization of size and scale and students' achievement in science and mathematics. The study used a modified panel longitudinal design to follow the same class of students over a 3-year period. The goal was to explore whether understandings of size and scale are related to achievement in mathematics and science. Results indicated a strong positive significant relationship existed between students' understanding of size and scale and students' science achievement in grades 5 and 8. There was a positive significant relationship between students' concepts of size and scale and students' mathematics achievement in grades 5, 6, 7, and 8. An examination of the relationships is included as well as a discussion of the integration of crosscutting concepts into science and mathematics instruction as a way to support deep learning.     

Geht’s auch mit der Maus? – Eine Methodenstudie zu Online-Befragungen in der Jugendforschung

While internet based surveys have gained importance in recent years, their use in adolescent related research is rare at best. The present paper offers an overview of advantages and disadvantages of online surveys and discusses their use in regard to the questioning of adolescents. In a comparison between two random samples of 13 to 17 year olds, we examine how differences between a telephone (N?= 1,784) and an online (N?= 1,652) survey materialize in regard to the coverage rate, discontinuation behavior, and item-non-response. The sampling is analyzed further with regard to sociodemographic differences. While there are no expected coverage problems for the adolescent target group, the results show that adolescents from educated families, as well as those with a migration background, took part more often in the online survey as opposed to the telephone survey. Also, a more intensive mobile use of the internet, as well as in part greater sports activity, is connected to a higher willingness to take part in the survey which suggests that the survey topic influences the willingness to participate.