Helping Prospective Principals Understand the Mathematics Curriculum: a Singapore experience

Principals should play an important role as curriculum leaders in their schools. To discharge this role effectively, the principals must understand the nature of curriculum not only of the disciplines in which they have been trained, but also of other key disciplines commonly included in the school programme. A way must be found to train the principals to acquire up‐to‐date knowledge of the practices and trends in various subject curricula, so that they can carry out informed discussions with the heads of subject departments to set goals and directions for these programmes. This article focuses on such a programme, called the Diploma in Educational Administration (DEA), which has been developed at the Institute of Education, Singapore to train prospective principals. In particular, the paper shows how local research has been integrated into the training programme to help participants understand the mathematics curriculum.     

Thermally multiplexed polymerase chain reaction

Amplification of multiple unique genetic targets using the polymerase chain reaction (PCR) is commonly required in molecular biology laboratories. Such reactions are typically performed either serially or by multiplex PCR. Serial reactions are time consuming, and multiplex PCR, while powerful and widely used, can be prone to amplification bias, PCR drift, and primer-primer interactions. We present a new thermocycling method, termed thermal multiplexing, in which a single heat source is uniformly distributed and selectively modulated for independent temperature control of an array of PCR reactions. Thermal multiplexing allows amplification of multiple targets simultaneously—each reaction segregated and performed at optimal conditions. We demonstrate the method using a microfluidic system consisting of an infrared laser thermocycler, a polymer microchip featuring 1 μl, oil-encapsulated reactions, and closed-loop pulse-width modulation control. Heat transfer modeling is used to characterize thermal performance limitations of the system. We validate the model and perform two reactions simultaneously with widely varying annealing temperatures (48 °C and 68 °C), demonstrating excellent amplification. In addition, to demonstrate microfluidic infrared PCR using clinical specimens, we successfully amplified and detected both influenza A and B from human nasopharyngeal swabs. Thermal multiplexing is scalable and applicable to challenges such as pathogen detection where patients presenting non-specific symptoms need to be efficiently screened across a viral or bacterial panel.     

Dialogue's Impact on the Quality of Relationships

This paper presents the findings of an action research that examines teachers' perception of the quality of dialogue and how it impacts on the quality of relationships in a primary school in Singapore. The paper explores how school leaders can facilitate dialogue and also discusses the issues and factors that affect teachers' perception of dialogue. Analysis of the data obtained through a questionnaire and face-to-face interviews shows that the more favourable the perception of dialogue amongst teachers, the more favourable is their perception of the quality of relationships in the school. The implication for school leaders is that by developing a higher quality of dialogue, a better school climate is fostered. This revised version was published online in August 2006 with corrections to the Cover Date.