Do Childhood Vaccines Have Non-Specific Effects on Mortality

A recent article by Kristensen et al. suggested that measles vaccine and bacille Calmette–Guérin (BCG) vaccine might\ud reduce mortality beyond what is expected simply from protection against measles and tuberculosis. Previous reviews of the potential effects of childhood vaccines on mortality have not considered methodological features of reviewed studies. Methodological considerations play an especially important role in observational assessments, in which selection factors for vaccination may be difficult to ascertain. We reviewed 782 English language articles on vaccines and childhood mortality and found only a few whose design met the criteria for methodological rigor. The data reviewed suggest that measles vaccine delivers its promised reduction in mortality, but there is insufficient evidence to suggest a mortality benefit above that caused by its effect on measles disease and its sequelae. Our review of the available data in the literature reinforces how difficult answering these considerations has been and how important study design will be in determining the effect of specific vaccines on all-cause mortality.\u

A robust low-cost high-sensitivity subangstrom bidirectional displacement sensor

Copyright © 2010 American Institute of PhysicsThe design of a simple, robust, low-cost, and bidirectional displacement sensor with subangstrom resolution is described. A small gold plate is attached to the object, whose displacement is to be measured, and a small gold tip is brought into contact with the plate, establishing a reference current between the two. Movements of the gold plate away from the tip lead to a change in the tip-plate current; the reference current is then re-established by moving the tip using a simple magnetic actuator. The resolution of the sensor has been calibrated using an interferometer and was shown to be as high as 0.3 Å per system count. Potential applications of the sensor are numerous, including microbar air pressure measurement, motion and infrasound detection, thermal sensing, and gravitational field and relativistic gravity wave measurement

A model of meta-population dynamics for North Sea and West of Scotland cod - the dynamic consequences of natal fidelity

It is clear from a variety of data that cod (Gadus morhua) in the North Sea do not constitute a homogeneous population that will rapidly redistribute in response to local variability in exploitation. Hence, local exploitation has the potential to deplete local populations, perhaps to the extent that depensation occurs and recovery is impossible without recolonisation from other areas, with consequent loss of genetic diversity. The oceanographic, biological and behavioural processes which maintain the spatial population structures are only partly understood, and one of the key unknown factors is the extent to which codexhibit homing migrations to natal spawning areas. Here, we describe a model comprising 10 interlinked demes of cod in European waters, each representing groups of fish with a common natal origin. The spawning locations of fish in each deme are governed by a variety of rules concerning oceanographic dispersal, migration behaviour and straying. We describe numerical experiments with the model and comparisons with observations, which lead us to conclude that active homing is probably not necessary to explain some of the population structures of European cod. Separation of some sub-populations is possible through distance and oceanographic processes affecting the dispersal of eggs and larvae. However, other evidence suggests that homing may be a necessary behaviour to explain the structure of other sub-populations. Theconsequences for fisheries management of taking into account spatial population structuring are complicated. For example, recovery or recolonisation strategies require consideration not only of mortality rates in the target area for restoration, but also in the source areas for the recruits which may be far removed depending on the oceanography. The model has an inbuilt capability to address issues concerning the effects of climate change, including temperature change, on spatial patterns of recruitment, development and population structure in cod

Raising the Curtain: Investigating the Practicum Experiences of Pre-service Drama Teachers

The practicum is internationally recognised as a valuable component of teacher education. It is an opportunity for pre-service teachers to develop teaching skills in authentic ways and pursue professional inquiry into practice. While extensive research has been conducted into the practicum generally, little research focuses on the practicum experience for pre-service drama teachers. This article, investigates the preparation of drama teachers for the profession with a particular focus on the practicum component of pre-service education. Drawing on the experiences of 19 pre-service drama teachers from a Western Australian university, focus-groups were conducted in order to scope the key components of the enablers and constraints embedded in their practicum. Four key themes were identified: stress, self-efficacy, mentoring practices, and teaching craft. In addition, the dimensions of each theme in relation to the adequate preparation of drama teachers were further revealed. Particular to the research was the role played by the extra curricula demands associated with drama as a learning area, and the mismatch between participant’s experience of drama and the culture shock many experienced in contemporary times. The research further emphasised the highs and lows of practicum, illuminating conditions most conducive to a quality practicum where pre-service drama teachers are able to develop pedagogy and the self-efficacy necessary to be an effective drama teacher, and importantly, one who remains in the profession

Performativity and creativity in senior secondary drama classrooms

This article examines the intersection between the senior secondary drama classroom, creativity and neoliberalism. Informed by a research project involving fifteen West Australian drama teachers and thirteen students, it considers the drama classroom as one site where tensions between the performative needs of neoliberal education and the more humanistic desires that drama teachers embody are enacted. This paper suggests that drama education can be a powerfully transformative vehicle for creative and innovative thinking because of its spatially unique classroom environment and embodied nature. However, collisions between rhetoric and reality, social good and economic return, can mean that young people are denied opportunities for choice and the capability development that drama education brings

More than “sluts” or “prissy girls”: Gender and becoming in senior secondary drama classrooms

This article examines the relationships between the embodiment of dramatic characters, gender, and identity. It draws on ethnographic data based on observations and interviews with 24 drama teachers and senior secondary drama students in Western Australia. We explore how student becomings in year 12 drama classrooms are mediated and constituted through socially overcoded gender binaries in a dominant neoliberal culture of competitive performativity. We ask the questions: What constructions of femininity and masculinity are students embodying from popular dramatic texts in the drama classroom at a critical time in their social and emotional development? Are these constructions empowering? Or disempowering? What factors are influencing teachers’ choices of texts for their predominantly female students? Our research shows that what is delimiting about this potentiality in a time of identity exploration and formation are the constraining gender-binary roles available to young women particularly, and the performative pressures teachers are experiencing

WISE Brown Dwarf Binaries: The Discovery of a T5+T5 and a T8.5+T9 System

The multiplicity properties of brown dwarfs are critical empirical constraints for formation theories, while multiples themselves provide unique opportunities to test evolutionary and atmospheric models and examine empirical trends. Studies using high-resolution imaging cannot only uncover faint companions, but they can also be used to determine dynamical masses through long-term monitoring of binary systems. We have begun a search for the coolest brown dwarfs using preliminary processing of data from the Wide-field Infrared Survey Explorer and have confirmed many of the candidates as late-type T dwarfs. In order to search for companions to these objects, we are conducting observations using the Laser Guide Star Adaptive Optics system on Keck II. Here we present the first results of that search, including a T5 binary with nearly equal mass components and a faint companion to a T8.5 dwarf with an estimated spectral type of T9