Developing Pedagogical Content Knowledge for Teaching a New Topic: More Than Teaching Experience and Subject Matter Knowledge

Teaching experience has been identified as an important factor in pedagogical content knowledge (PCK) development. However, little is known about how experienced teachers may draw on their previous experience to facilitate their PCK development. This study examined how two experienced high school biology teachers approached the teaching of a newly introduced topic in the curriculum, polymerase chain reaction and their PCK development from the pre-lesson planning phase through the interactive phase to the post-lesson reflection phase. Multiple data sources included classroom observations, field notes, semi-structured interviews and classroom artefacts. It was found that the teachers’ previous experience informed their planning for teaching the new topic, but in qualitatively different ways. This, in turn, had a bearing on their new PCK development. Subject matter knowledge (SMK) can not only facilitate but may also hinder this development. Our findings identify two types of experienced teachers: those who can capitalise on their previous teaching experiences and SMK to develop new PCK and those who do not. The critical difference is whether in the lesson planning stage, the teacher shows the disposition to draw on a generalised mental framework that enables the teacher to capitalise on his existing SMK to develop new PCK. Helping teachers to acquire this disposition should be a focus for teacher training in light of continuous curriculum changes.     

Same Assessment,Different Practice: Professional consciousness as a determinant of teachers' practice in a school-based assessment scheme

The forms that assessment takes are widely recognised as determinants of educational practice. This paper, however, argues that a teacher's professional consciousness is a more fundamental determinant of teaching practice. To explore the issue, this paper examines data from a larger study which set out to examine the relationship between teachers' practice and their beliefs in the context of a mandatory school-based assessment scheme. Using a theoretical framework that advocates an emancipatory approach to educational changes, it was found that some teachers adopted a passive role regarding policy interpretation and implementation while others adopted a more critical stance in interpreting the policy requirements, demonstrating a more proactive approach in its implementation. The emancipatory approach is conceptualised in terms of three key dimensions: professional confidence, professional interpretation and professional consciousness. The findings of the study carry implications for teacher professional development.     

The Sun — Major energy resource for the future

With rising standards of living, the per capita energy consumption is increasing rapidly all over the world. The limited reserves of fossil fuels may be exhausted by the middle of the next century. This crisis situation has forced technologists to turn to alternate sources of energy, like wind energy, ocean thermal energy and solar energy. All the above forms of energy are indirectly derived from solar energy. In this article a short account of the amount of solar radiation reaching the earth, its spectral distribution and its interaction with the earth’s atmosphere is presented. A brief discussion is given on hydro-power, wind-power and ocean thermal energy conversion as indirect techniques of utilization of solar energy. Solar energy can also be directly converted into heat and electricity. Techniques for such direct conversion, with special reference to photovoltaic generation of electricity, are also described in this article.     

Factors Influencing Retention of Gen Y and Non-Gen Y Teachers Working at International Schools in Asia

Quantitative studies on international-school teacher retention are few, especially studies that differentiate between Gen Y and non-Gen Y teachers. This article reports on the findings of a study that examined the relationship of job satisfaction factors to the likelihood of contract renewal by international-school teachers. Results from the study show statistically significant relationships between some factors of job satisfaction and contract renewal for teachers in Gen Y and non-Gen Y (Baby Boomers, Gen X) cohorts.     

Lipid metabolism in tumour bearing mice treated withAeromonas L-asparaginase

The anticancerous drug isolated in our laboratory from estuarineAeromonas was characterised and is found to be an enzyme, L-asparaginase. The antileukaemic effect of this drug was studied in mice by inducing leukaemia with Ehrlich ascites cell lines. It was compared with commercially available drug, Leunase, isolated fromE. coli. The lipid profiles in mice during leukaemia and under treatment was studied. The decreased levels of cholesterol and increased levels of triglycerides and phospholipids in serum, liver and kidney were observed in tumour bearing mice. Significant changes in the above values were observed with enzyme therapy. It could bring some of the values to near normal level. L-asparaginase fromAeromonas was found to be more effective.     

Star gazing: Transing gender communication

ABSTRACT

This activity implores students and pedagogues to engage intrapersonal gender subjectivity through the analytic practice of transing gender communication. Specifically, Yep, Russo, and Allen (Pushing boundaries: Toward the development of a model for transing communication in (inter)cultural contexts. In L. G. Spencer & J. C. Capuzza (Eds.), Transgender communication studies: Histories, trends, and trajectories. Lanham, MD: Lexington Books, 2015, pp. 69–89) suggest gender is best understood as: (1) intersectional, (2) a performative and administrative accomplishment, (3) multiple, and (4) self-determined. Students are asked to analyze their gender sense of self through each of the pillars in a hands-on creative activity. The end result is a means of narrating one’s own gender in relational tension with other gender subjectivities.

Courses: Interpersonal Communication, Intercultural Communication, Gender and Communication, Performance Studies

Objectives: Designed to accompany a sustained conversation on questions of gender and communication, this unit- or semester-long activity imparts a critical approach to gender understanding through one’s own subjective gender experience by engaging the analytic work of “transing” (Stryker, Currah, & Moore, Introduction: Trans-, trans, or transgender? WSQ: Women’s Studies Quarterly, 2008;36(3–4):13). Further, the activity equips students with a working understanding of trans-affirming discourse including the critical capacity to de-center normative gender through lived experience. Finally, students are provided a space in which to explore and voice, through creative means, their own gender “galaxy” (Yep, Russo, & Allen, Pushing boundaries: Toward the development of a model for transing communication in (inter)cultural contexts. In L. G. Spencer & J. C. Capuzza (Eds.), Transgender communication studies: Histories, trends, and trajectories. Lanham, MD: Lexington Books, 2015, p. 70).