Identification of Threshold Concepts for Biochemistry

Threshold concepts (TCs) are concepts that, when mastered, represent a transformed understanding of a discipline without which the learner cannot progress. We have undertaken a process involving more than 75 faculty members and 50 undergraduate students to identify a working list of TCs for biochemistry. The process of identifying TCs for biochemistry was modeled on extensive work related to TCs across a range of disciplines and included faculty workshops and student interviews. Using an iterative process, we prioritized five concepts on which to focus future development of instructional materials. Broadly defined, the concepts are steady state, biochemical pathway dynamics and regulation, the physical basis of interactions, thermodynamics of macromolecular structure formation, and free energy. The working list presented here is not intended to be exhaustive, but rather is meant to identify a subset of TCs for biochemistry for which instructional and assessment tools for undergraduate biochemistry will be developed.     

Introducing an observational measure of standards-based mathematics teaching practices: Evidence of validity and score reliability

The purpose of this study is to introduce a measure of standards-based mathematics teaching practices, the Mathematics Scan (M-Scan), and to examine its validity and score reliability. First, we define standards-based mathematics teaching practices based on eight dimensions that have emerged in recent conceptualizations by researchers and in the context of existing observational measures. Second, we present three sources of validity evidence: content review by experts, analysis of response processes of coders, and convergent and discriminant patterns with existing observational measures. Third, we provide evidence of inter-coder (or inter-rater) reliability through analyses of variance components and calculation of reliability coefficients, using the framework of generalizability theory. Results show the M-Scan holds promise as a useful tool in mathematics education research, measuring indicators of standards-based teaching practices unique to the subject of mathematics.     

HOW HOMES INFLUENCE SCHOOLS: EARLY PARENTING PREDICTS AFRICAN AMERICAN CHILDREN'S CLASSROOM SOCIAL–EMOTIONAL FUNCTIONING

Data from the Early Childhood Longitudinal Study, Kindergarten Cohort were used to examine the extent to which early parenting predicted African American children's kindergarten social–emotional functioning. Teachers rated children's classroom social–emotional functioning in four areas (i.e., approaches to learning, self‐control, interpersonal skills, and externalizing behaviors). Mothers completed self‐report questionnaires assessing their home‐based parenting practices (i.e., warmth and home learning stimulation). Hierarchical regression analyses revealed that mothers who engaged in more frequent home learning stimulation (e.g., shared book reading) had children with more positive teacher ratings of approaches to learning, self‐control, interpersonal skills, and fewer externalizing behaviors. Notably, demographic characteristics also contributed to children's social–emotional functioning. Specifically, African American girls from more affluent, two‐parent homes with highly educated mothers had the most positive ratings of classroom social–emotional functioning across all four dimensions.     

Teacher–student relationship and academic achievement: a cross-lagged longitudinal study on three different age groups

Although the relation between teacher–student relationship and academic achievement has been addressed in many studies, the reciprocal relations between these two constructs have not been explored sufficiently. The aim of the present study was to test three competing models that hypothesized directionality of influence in relations between teacher acceptance, student-perceived teacher support, and academic achievement. Eight hundred sixteen students from 3 different grade levels in Slovenian elementary and secondary schools, covering the age range from late childhood through early-to-middle adolescence, participated in the study at the beginning and at the end of the school year. Structural equation modeling was used. Different models of relations between teacher acceptance, student-perceived teacher support, and academic achievement were analyzed using the cross-lagged panel correlation technique. The results supported the hypothesized reciprocal model, indicating the relation between teacher acceptance and academic achievement in both directions. Student-perceived teacher personal support partially mediates the relation between teacher acceptance and achievement in both directions on the whole sample but not in specific age groups. Finally, we found some age-specific differences in the relations between teacher acceptance, teacher personal support, and achievement.     

How teachers learn: the roles of formal,informal, and independent learning

A qualitative study of math and science teachers at two middle schools identifies how their system for learning to integrate technology into their teaching goes beyond what school leaders typically consider when planning for teachers’ learning. In addition to (a) the district-initiated, or formal, system of professional development (PD) and professional learning communities (PLCs), it includes (b) teacher-initiated, or informal, learning with colleagues as well as (c) teachers’ independent learning activities. Analysis of why and how they form their system highlights how by only supporting the formal PD activities and PLCs, the district not only loses the valuable collective knowledge of the districts’ teachers derived from their informal and independent learning activities, but also diminishes the learning teachers derive from the formal PD activities since informal collaborations and independent work after formal PD activities often helps to bring the learning from the training room to the classroom. We present teachers’ insights and then discuss implications for the design of a holistic approach to facilitate teachers’ formal, informal, and independent learning that is tied together and supported by technology. While research on formal, informal and independent teacher learning exists, with technology frequently mentioned as a potential support for each of these three modes, these approaches have not been considered together as interdependent parts of the same holistic system for teacher learning nor has the way technology might knit these modes of teacher learning together been imagined as a part of that system.     

Enhancing Students’ Learning Process Through Self-Generated Tests

The use of new technologies in higher education has surprisingly emphasized students’ tendency to adopt a passive behavior in class. Participation and interaction of students are essential to improve academic results. This paper describes an educational experiment aimed at the promotion of students’ autonomous learning by requiring them to generate test type questions related to the contents of the course. The main idea is to make the student feel part of the evaluation process by including students’ questions in the evaluation exams. A set of applications running on our university online learning environment has been developed in order to provide both students and teachers with the necessary tools for a good interaction between them. Questions uploaded by students are visible to every enrolled student as well as to each involved teacher. In this way, we enhance critical analysis skills, by solving and finding possible mistakes in the questions sent by their fellows. The experiment was applied over 769 students from 12 different courses. Results show that the students who have actively participated in the experiment have obtained better academic performance.     

How do preservice teachers perceive ‘environment’ and its relevance to their area of teaching?

The environment is not only an ecological entity distinct from people but a cultural, social, and political construct. Understanding how learners conceptualize ‘environment’ may contribute to more effective environmental education (EE). This study investigated, in a paired pre–post design, 215 students’ understandings of ‘environment’ and perceptions of its relevance to their teaching area, at the onset and toward the end of their studies in teacher-education colleges in Israel. While student teachers, regardless of their major, acknowledged the importance of EE to their future function as teachers, they do not demonstrate an adequate understanding of the concept environment: humans are not viewed as part of the environment nor is the environment understood as a complex web of interactions among people, man-made systems and natural ecosystems. The fact that toward the end of studies, student teachers’ understandings of environment remained essentially basic indicates the necessity to reorient teacher-education programs toward EE. The various ways in which students perceived the relevance of environment to their teaching area are the starting points for this change.     

Development and validation of a method to directly measure the cable force during the hammer throw

The development of cable force during hammer-throw turns is crucial to the throw distance. In this paper, we present a method that is capable of measuring cable force in real time and, as it does not interfere with technique, it is capable of providing immediate feedback to coaches and athletes during training. A strain gauge was mounted on the wires of three hammers to measure the tension in the wire and an elite male hammer thrower executed three throws with each hammer. The output from the gauges was recorded by a data logger positioned on the lower back of the thrower. The throws were captured by three high-speed video cameras and the three-dimensional position of the hammer's head was determined by digitizing the images manually. The five best throws were analysed. The force acting on the hammer's head was calculated from Newton's second law of motion and this was compared with the force measured via the strain gauge. Qualitatively the time dependence of the two forces was essentially the same, although the measured force showed more detail in the troughs of the force–time curves. Quantitatively the average difference between the measured and calculated forces over the five throws was 76 N, which corresponds to a difference of 3.8% for a cable force of 2000 N.     

Heart Rate Variability

The purpose of the present study was to investigate the influence of two exercise intensities (moderate and severe) on heart rate variability (HRV) response in 16 runners 1 hr prior to (-1 hr) and at +1 hr, +24 hr, +48 hr, and +72 hr following each exercise session. Time domain indexes and a high frequency component showed a significant decrease (p < .001) between -1 hr and +1 hr for severe intensity. The low frequency component in normalized units significantly increased (p <.01) for severe intensity at +1 hr. Only severe exercise elicited a change in HRV outcomes postexercise, resulting in a reduction in the parasympathetic influence on the heart at +1 hr; however, values returned to baseline levels by +24 hr.