Preservice Elementary Teachers’ Science Self-Efficacy Beliefs and Science Content Knowledge

Self-efficacy beliefs that relate to teachers’ motivation and performance have been an important area of concern for preservice teacher education. Research suggests high-quality science coursework has the potential to shape preservice teachers’ science self-efficacy beliefs. However, there are few studies examining the relationship between science self-efficacy beliefs and science content knowledge. The purpose of this mixed methods study is to investigate changes in preservice teachers’ science self-efficacy beliefs and science content knowledge and the relationship between the two variables as they co-evolve in a specialized science content course. Results from pre- and post-course administrations of the Science Teaching Efficacy Belief Instrument-B (Bleicher, 2004) and a physical science concept test along with semi-structured interviews, classroom observations and artifacts served as data sources for the study. The 18 participants belonged to three groups representing low, medium and high initial levels of self-efficacy beliefs. A repeated measures multivariate analysis of variance design was used to test the significance of differences between the pre- and post-surveys across time. Results indicated statistically significant gains in participants’ science self-efficacy beliefs and science conceptual understandings. Additionally, a positive moderate relationship between gains in science conceptual understandings and gains in personal science teaching efficacy beliefs was found. Qualitative analysis of the participants’ responses indicated positive shifts in their science teacher self-image and they credited their experiences in the course as sources of new levels of confidence to teach science. The study includes implications for preservice teacher education programs, science teacher education, and research.     

Perceptions of future and cur rent teachers on the organization of elementary schools: a dissonance approach to the investigation of job satisfaction

The study compares the satisfaction ratings of future and current elementary school teachers with respect to the main aspects of school organization and administration. Data were collected from 66 in-service teachers and 79 preservice teachers in Cyprus. The application of factor analysis on the data resulted in the identification of the following main dimensions of school organization: headmaster's role, school organization, school climate, teacher incentives/work conditions, inspector's role and teachers' role. The comparison of the satisfaction ratings of future and current teachers on the above factors produced the following findings: first, the ratings of the two groups differed significantly for the first four factors. Secondly, future teachers reported lower satisfaction ratings than their in-service counterparts in the headmaster's role, school organization and school climate factors and higher ratings on the teacher incentives/work conditions factor.These discrepancies are considered to constitute causes of concern for educational policy-makers. The high expectations of future teachers on the teacher incentives/work conditions factor are viewed as a probable subsequent cause of cognitive dissonance and job dissatisfaction. On the other hand, the low expectations of future teachers with respect to three factors (headmaster's role, school organization, school climate) are likely to reduce their initial enthusiasm for their job. The implications of the findings for teacher training programmes are discussed, and suggestions are made on ways of reducing discrepancies between the expectations of future teachers and the realities of the workplace.     

A microfluidic co-culture system to monitor tumor-stromal interactions on a chip

The living cells are arranged in a complex natural environment wherein they interact with extracellular matrix and other neighboring cells. Cell-cell interactions, especially those between distinct phenotypes, have attracted particular interest due to the significant physiological relevance they can reveal for both fundamental and applied biomedical research. To study cell-cell interactions, it is necessary to develop co-culture systems, where different cell types can be cultured within the same confined space. Although the current advancement in lab-on-a-chip technology has allowed the creation of in vitro models to mimic the complexity of in vivo environment, it is still rather challenging to create such co-culture systems for easy control of different colonies of cells. In this paper, we have demonstrated a straightforward method for the development of an on-chip co-culture system. It involves a series of steps to selectively change the surface property for discriminative cell seeding and to induce cellular interaction in a co-culture region. Bone marrow stromal cells (HS5) and a liver tumor cell line (HuH7) have been used to demonstrate this co-culture model. The cell migration and cellular interaction have been analyzed using microscopy and biochemical assays. This co-culture system could be used as a disease model to obtain biological insight of pathological progression, as well as a tool to evaluate the efficacy of different drugs for pharmaceutical studies.