Science Content Courses: Workshop in Food Chemistry for 4th Grade School Teachers

ABSTRACT: A science content course in food chemistry was offered as a 4-day summer workshop from 1999 to 2001 to 4th grade school teachers in the Seattle School District. The objectives of the workshop were to increase the teachers' knowledge of food science, to perform simple experiments that could be used in the 4th grade classroom, and to help the teachers become more familiar with the scientific method. The workshop is described, and challenges associated with running the workshop from the instructors' perspective are discussed. Protocol for hands-on experiments used in the workshop, discussion questions/answers, and comments about each experiment are included in Appendices. The use of hands-on experiments that were easily adaptable to the 4th grade classroom and the comfortable atmosphere for discussion appear to have contributed the most to a successful workshop.     

Seeing Is Believing: Effective Components of Professional Development Training for County Extension Educators on an Innovation Perceived as Risky—Food Irradiation

ABSTRACT: Decades of research have provided evidence that food irradiation is a safe technology that can decrease the incidence of foodborne diseases; however, adoption of this technology has been slow. The purpose of our study was to qualitatively explore the effectiveness of various components of a professional development training on family and consumer sciences county extension educators' understanding of food irradiation. This training included presentations by experts in the field, a tour of a food irradiation research facility and a meat processing facility, group activities, and a computer simulation model. Data were collected using qualitative research methodology through in-depth interviews conducted after the training. Results indicated that those components that allowed participants to visualize food irradiation processes seemed most beneficial to their understanding. Based on these data, implications for practice are discussed.     

Do Costs Differ Between For-Profit and Not-for-Profit Producers of Higher Education?

In theory, not-for-profit organizations will be characterized by higher production costs per unit of output than for-profit producers of otherwise-identical goods/services, since profit maximization implies cost minimization per unit of output; breaking even does not imply cost minimization and, indeed, may imply inflated costs. We explore the empirical validity of this hypothesis in the context of higher education. Using 1996 data, we estimate multiproduct cost functions for 1,450 public, 1,316 private, not-for-profit, and 176 private, for-profit institutions of higher education in the United States. We fail to find a statistically significant difference between for-profit and not-for-profit private providers, but do find a statistically significant difference between private, not-for-profit institutions and public institutions.     

New Metrics for Employee Development

Organizations are increasingly concerned about human resource accountability and have turned to HR metrics as an economical way to assess results from human resource activities. Unfortunately, many existing development metrics have limited utility. In this article, we review and discuss existing metrics for employee development. Then, we present five new development metrics and that can provide a core set of metrics for any type of organization. These metrics will provide new perspectives that older metrics do not, and lead to better human resource development decisions.     

Multiple choice and true/false tests: reliability measures and some implications of negative marking

The standard error of measurement usefully provides confidence limits for scores in a given test, but is it possible to quantify the reliability of a test with just a single number that allows comparison of tests of different format? Reliability coefficients do not do this, being dependent on the spread of examinee attainment. Better in this regard is a measure produced by dividing the standard error of measurement by the test's ‘reliability length’, the latter defined as the maximum possible score minus the most probable score obtainable by blind guessing alone. This, however, can be unsatisfactory with negative marking (formula scoring), as shown by data on 13 negatively marked true/false tests. In these the examinees displayed considerable misinformation, which correlated negatively with correct knowledge. Negative marking can improve test reliability by penalizing such misinformation as well as by discouraging guessing. Reliability measures can be based on idealized theoretical models instead of on test data. These do not reflect the qualities of the test items, but can be focused on specific test objectives (e.g. in relation to cut‐off scores) and can be expressed as easily communicated statements even before tests are written.     

Illuminating and facilitating professional knowledge through case work

In the spring of 2002 the Ontario College of Teachers began a research project in order to foster awareness of the Standards of Practice for the 187 000 teachers in the province. Case work, in which 18 teachers representative of the College's membership wrote narratives describing their professional dilemmas, was the methodology chosen. Through reflection and collaborative group work these practitioners co‐created a set of cases, mapping them back to the standards in order to ascertain how the standards had been embedded or absent from their daily practice. To validate the effectiveness of this method, we used the cases in pre‐service, in‐service, principal and supervisory personnel venues. We also recorded the impact of the ‘case institute’ in a focus group session with the original writers. Augmented by commentaries from internationally known teacher educators, this text will be sent to all provincial school boards as part of a resource kit to educate teachers about the standards of practice.

Au printemps 2002, l'Ordre des enseignantes et des enseignants de l'Ontario amorçait un projet de recherche ayant pour but de sensibiliser les 187 000 enseignants de la province aux normes d'exercice de leur profession. L'étude de cas rédigés par 18 enseignants membres de l'Ordre est la méthode qui allait servir à présenter divers dilemmes professionnels. Ainsi, ces praticiens ont réfléchi et travaillé ensemble pour présenter des cas et les rattacher aux normes afin de déterminer la présence ou l'absence des normes dans leurs pratiques quotidiennes. Pour valider l'efficacité de cette méthode, nous avons mis les cas à l'épreuve lors d'activités organisées pour les étudiants des facultés d'éducation, des enseignants en perfectionnement professionnel, des directeurs d'école et des agents de supervision. Nous avons également réuni les 18 rédacteurs pour discuter de l'impact des ateliers de rédaction de cas. Le texte, auquel s'ajoutent les commentaires d'éducateurs de renommée internationale, fera partie de la trousse de ressources qui sera envoyée à tous les conseils scolaires de la province pour initier les enseignants aux normes d'exercice de la profession.

Im Frühjahr 2002, unternahm das Ontario College of Teachers einen Forschungsprojekt mit dem Ziel, das Bewußtsein der Normen der Praxis unter den 187,000 Lehrer des Bundeslandes Ontario zu fördern. Die gewählte Methodologie war die Untersuchung von spezifischen Fallberichten, in denen 18 Lehrer, die repräsentativ für die Mitglieder der Organisation dastehen, ihre Entscheidungen im beruflichen Alltag begründeten. In einem von Überlegung, Zusammenarbeit und Gruppenarbeit geprägten Verfahren schufen diese Lehrer und Lehrerinnen einen Korpus der Fälle, die sie anschließend zu den Berufsnormen zurückverfolgten, um festzustellen, wie die Normen sich in der täglichen Praxis eingebettet hatten oder das Gegenteil. Um die Wirksamkeit der Methode zu bestätigen, wurden Einzelfälle in vorberuflichen, beruflichen, Direktor‐ und Aufsichtsstellen‐bezogenen Umgebungen ausgesucht. Die Wirkung der Falluntersuchungen wurde auch in einer Diskussionsrunde mit den Autoren aufgenommen. Dieser Text, bereichert durch Kommentare von Lehrerausbildern von internationalem Ruf, wird an alle Schulverwaltungen im Bundesland Ontario als Bestandteil eines Ressourcen‐Compendiums versandt, mit dem Ziel, Lehrer über die Normen der Berufspraxis weiterzubilden.

En la primavera del 2002, el Colegio de Profesores de Ontario inició un proyecto de investigación para crear conciencia entre los 187,000 maestros en la provincia sobre los estándares de práctica profesional. La metodología elegida fue el ‘Estudio de antecedentes’ en la que un grupo representativo de la membresía del Colegio, conformado por 18 maestros, redactó historias contando sus dilemas profesionales. Tras mucha reflexión y trabajo mancomunado de equipo, estos profesores crearon colectivamente un conjunto de casos, trazando un mapa vinculándolos a los estándares y así poder determinar de qué manera estos estándares habían estado arraigados en su práctica profesional cotidiana o si los habían dejado de lado. Para validar la eficacia de este método, aplicamos los casos en varios contextos docentes: estudiantes de la facultad de educación, capacitación profesional para docentes, directores de plantel y superintendentes de las juntas directivas escolares. También tomamos nota del impacto del ‘Taller para la redacción de casos’ en una sesión de enfoque grupal con los propios autores. Este texto, que ha sido complementado con comentarios de capacitadores de maestros conocidos internacionalmente, será enviado a todas las Juntas Directivas de las escuelas provinciales como parte del kit de recursos para educar a los profesores sobre los estándares de práctica profesional.     

Embodiment,social praxis and environmental education: Some thoughts

The body has been neglected and devalued in Western philosophy. This neglect and devaluation of the body is rooted in dualistic reasoning that has its origin in Greek philosophical thought, and reinforced by philosophers of science during the scientific revolution of 17^th century Europe. Dualistic reasoning is in part the cause of current global environmental crises. Moreover, it underpins different approaches to environmental education. In this article I explore the nexus of embodiment and social praxis generally and more specifically in relation to the construct of race. Difference (including race difference) has been given scant attention in environmental education literature in South Africa and I attempt in this article to give it some attention so as to move it into the spaces of our dialogues and conversations.     

Biomarkers of inflammation and cardiac remodeling: the quest of relevant companions for the risk stratification of heart failure patients is still ongoing

Heart failure (HF) is a frequent chronic disease in elderly people and represents a major health and economic burden. The accurate diagnosis of HF and the identification of high risk patients is mandatory to select the appropriate therapy and care. HF is associated to cardiac remodeling and inflammation and to the release of neurohormones. If natriuretic peptides remain the biomarkers of choice for the diagnosis and the prognosis of HF, several biomarkers related to cardiac remodeling and inflammation are available for testing and may add valuable information for the risk estimation of HF patients and for the selection of the most appropriated therapy. Furthermore, the quest for new efficient biomarkers of cardiac remodeling and inflammation is still ongoing and new candidates have been identified for a potential use in daily clinical practices. However, before their potential translation to routine parameters several challenges ranging form the analytical validation to the cost-effectiveness estimation should be considered.     

Mixed ℓ2 and ℓ1-norm regularization for adaptive detrending with ARMA modeling

In this paper, the problem of detrending a time series and/or estimating a wandering baseline is addressed. We propose a new methodology that adaptively minimizes different regularized cost functions by introducing an ARMA model of the underlying trend. Mixed ?₁/?₂-norm penalty functions are taken into consideration and novel RLS and LMS solutions are derived for the model parameters estimation. The proposed methods are applied to typical trend estimation/removal problems that can be found in the analysis of economic time series or biomedical signal acquisition. Comparisons with standard noncausal filtering techniques are also presented.