Teaching Ecosystems and Matter Cycles with Creative Drama Activities

The purpose of this study is to examine the effect of creative drama-based instruction on seventh graders’ science achievements in the ecology and matter cycles unit and their attitudes toward science. The study is an experimental study carried out in one of the public elementary schools in Turkey during 2005–2006 schooling year. An ecological concept achievement test was developed and administered to 45 students in two classes (as control and experimental group) of an elementary school before and after the treatment. The experimental group received creative drama-based instruction and the control group received traditional instruction. A guiding instruction material which contains six lesson plans in the subject was constructed for the teacher to administer creative drama-based instruction. The topics of ecosystems and matter cycles were taught to the both of groups for 3 weeks. A science attitude test was administered to both groups before and after the treatment. The results revealed a statistically significant difference between the mean scores of the both groups with respect to achievement in the ecology concepts and median of the attitudes toward science in favour of the experimental group after the treatment.     

An investigation on value orientations,attitudes and concern towards the environment: the case of Turkish elementary school students

Environmental attitudes depend on the relative importance that individuals attach to themselves, other people, or all living things. These distinct bases have been found to predict environmental concern, and may act as statistically significant determinants of pro-environmental behaviours. We claim that examining the complex nature of value orientations and concern levels among elementary school students as well as the interrelationships between these attributes could guide researchers and educators in Turkey. This study aimed (1) to explore Turkish elementary students’ ecocentric and anthropocentric attitudes, and environmental apathy; (2) to investigate their egoistic, altruistic and biospheric value orientations as well as their environmental concerns; (3) to examine relationships among environment-related attributes and (4) to determine the role of gender on these attributes. Participants seemed to be highly concerned and held favourable ecocentric attitudes. Furthermore, students with higher levels of anthropocentric attitudes tended to exhibit higher levels of environmental apathy, and those expressing biospheric concerns held lower levels of egoistic concerns. The findings suggest that girls were significantly more concerned about environmental problems and tended to value nature more for its own sake than boys.     

Swinging in imaginary time More on the not-so-simple pendulum

When the small angle approximation is not made, the exact solution of the simple pendulum is a Jacobian elliptic function with one real and one imaginary period. Far from being a physically meaningless mathematical curiosity, the second period represents the imaginary time the pendulum takes to swing upwards and tunnel through the potential barrier in the semi-classical WKB approximation¹ in quantum mechanics. The tunneling here provides a simple illustration of similar phenomena in Yang-Mills theories describing weak and strong interactions.     

The neuroscience of perceptual categorization in pigeons: A mechanistic hypothesis

We are surrounded by an endless variation of objects. The ability to categorize these objects represents a core cognitive competence of humans and possibly all vertebrates. Research on category learning in nonhuman animals started with the seminal studies of Richard Herrnstein on the category “human” in pigeons. Since then, we have learned that pigeons are able to categorize a large number of stimulus sets, ranging from Cubist paintings to English orthography. Strangely, this prolific field has largely neglected to also study the avian neurobiology of categorization. Here, we present a hypothesis that combines experimental results and theories from categorization research in pigeons with neurobiological insights on visual processing and dopamine-mediated learning in primates. We conclude that in both fields, similar conclusions on the mechanisms of perceptual categorization have been drawn, despite very little cross-reference or communication between these two areas to date. We hypothesize that perceptual categorization is a two-component process in which stimulus features are first rapidly extracted in a feed-forward process, thereby enabling a fast subdivision along multiple category borders. In primates this seems to happen in the inferotemporal cortex, while pigeons may primarily use a cluster of associative visual forebrain areas. The second process rests on dopaminergic error-prediction learning that enables prefrontal areas to connect top down the relevant visual category dimension to the appropriate action dimension.     

A bottlenose dolphin discriminates visual stimuli differing in numerosity

A bottlenose dolphin was trained to discriminate two simultaneously presented stimuli differing in numerosity (defined by the number of constituent elements). After responding correctly to stimuli consisting of three-dimensional objects, the dolphin transferred to two-dimensional stimuli. Initially, a variety of stimulus parameters covaried with the numerosity feature. By systematically controlling for these stimulus parameters, it was demonstrated that some of these attributes, such as element configuration and overall brightness, affected the animal’s discrimination performance. However, after all the confounding parameters were under control, the dolphin was able to discriminate the stimuli exclusively on the basis of the numerosity feature. The animal then achieved a successful transfer to novel numerosities, both intervening numerosities and numerosities outside the former range. These findings provide substantial evidence that the dolphin could base his behavior on the numerosity of a set independently of its other attributes and that he represented ordinal relations among numerosities.     

Conservation laws, equivalence principle and forbidden radiation modes

There are standard proofs showing there can be no monopole electromagnetic radiation and no dipole gravitational radiation. We supplement these with a global topological argument for the former, and a local argument based directly on the principle of equivalence for the latter.     

Unemployment,the Great Recession,and apprenticeship attrition in the U.S.

The author estimates the impacts of the local rate of unemployment and the Great Recession on the quit and graduation rates of the U.S. construction trade apprentices over the 2001–2014 period. Trade union participation in training sponsorship had a strong influence on attrition rates. The impacts of the business cycle and the Great Recession on the attrition rate also varied across sponsor types. During downturns, apprenticeship duration of the quitters in union-employer jointly sponsored programmes was longer, suggesting that the trainees were able to stay with the programme as jobs become scarcer. However, during the Great Recession the quit hazard among these trainees increased, which indicates declining long-term career prospects. In contrast, apprentices in unilateral multiple-employer programmes dropped out at faster rates during the downturns, except during the Great Recession. The increase in the staying power of the quitters in employer-only programmes during the Great Recession is a puzzle. The eventual probability of cancellation was lower among the union-employer joint programmes than in the employer-only programmes, although the difference narrowed down during the Great Recession.     

Utilization of biological variation data in the interpretation of laboratory test results – survey about clinicians’ opinion and knowledge

IntroductionTo interpret test results correctly, understanding of the variations that affect test results is essential. The aim of this study is: 1) to evaluate the clinicians’ knowledge and opinion concerning biological variation (BV), and 2) to investigate if clinicians use BV in the interpretation of test results.Materials and methodsThis study uses a questionnaire comprising open-ended and close-ended questions. Questions were selected from the real-life numerical examples of interpretation of test results, the knowledge about main sources of variations in laboratories and the opinion of clinicians on BV. A total of 399 clinicians were interviewed, and the answers were evaluated using a scoring system ranked from A (clinician has the highest level of knowledge and the ability of using BV data) to D (clinician has no knowledge about variations in laboratory). The results were presented as number (N) and percentage (%).ResultsAltogether, 60.4% of clinicians have knowledge of pre-analytical and analytical variations; but only 3.5% of them have knowledge related to BV. The number of clinicians using BV data or reference change value (RCV) to interpret measurements results was zero, while 79.4% of clinicians accepted that the difference between two measurements results located within the reference interval may be significant.ConclusionsClinicians do not use BV data or tools derived from BV such as RCV to interpret test results. It is recommended that BV should be included in the medical school curriculum, and clinicians should be encouraged to use BV data for safe and valid interpretation of test results.