Polychlorinated biphenyls (PCBs) are a family of synthetic chemicals consisting of carbon, hydrogen, and chlorine atoms. PCBs have been produced commercially since 1929 in hundreds of industrial applications. Their continued production in the United States was phased out in the late 1970s, and strict disposal guidelines were regulated as adverse…

Inuit communities in Northern Quebec (Canada) are exposed to environmental contaminants, particularly to mercury, lead and polychlorinated biphenyls (PCBs). Previous studies reported adverse associations between these neurotoxicants and memory performance. Here we aimed to determine the associations of pre- and postnatal exposures to mercury, lead…

Drawing upon social cognitive career theory model of career self-management, we examined the relationship between work placement supervisor support (WPSS) and students' proactive career behaviors (PCB), mediating role of work placement learning self-efficacy and the moderating effect of proactivity in the indirect relationships. Data were…

This study develops a framework for describing the components and variations of pedagogic content beliefs (PCBs) held by accounting teachers in vocational schools in Shanghai. Semistructured interviews were held with 17 in-service teachers from four vocational schools in Shanghai. The findings show that the PCBs of accounting teachers are a…

Meta-analyses suggest that student learning outcomes (SLOs) are comparable across modalities of instruction. None of these studies examined how unmet student expectations (here, unexpected changes in course delivery) might increase perceptions of student--instructor-university psychological contract breaches (PCBs) and, ultimately, perceived SLOs…

Research suggests (a) students benefit when educators implement positive and proactive classroom behavior support practices (e.g., maximizing structure, teaching expected behaviors, delivering engaging instruction) and (b) educators benefit when school leadership teams invest in positive and proactive professional development support systems…

There is a research base for practices associated with Positive Classroom Behavior Supports (PCBS). An ongoing concern in the field is how to support educators in selecting and implementing with fidelity, the evidence-based practices matched to student needs. The classroom strand at the recent 2022 Center on Positive Behavioral Interventions and…

Over the past decade the Accreditation Board for Engineering and Technology, Inc. (ABET) has changed the general chemistry requirements to include a single introductory course for most engineering majors. There is a focus on outcomes that equip students with the ability to pass the Fundamentals of Engineering (FE) Exam and to work in…

A low-cost multispectral imager was built using a multiwavelength LED PCB (light-emitting diode printed circuit board), 3D printed housing, and a monochrome camera, and it was controlled via National Instruments LabVIEW software coupled with some simple electronics. Multivariate data analysis was performed using freely available software packages.…

This exploratory study compares how young people (ages 15-16) learn circuitry concepts and layout design principles important to electrical engineering using one of two educational circuitry toolkits: paper circuits and traditional solderless breadboards. Paper-based prototyping kits are representative of a trend that incorporates new materials…

A strategy-based reading promotion program was implemented over a course of 8 months in 65 classes from grades 5 to 7 (student age M?=?11.2 years, SD?=?1.0). It was investigated whether teachers flexibly adapted their pedagogical content beliefs (PCBs) on the teaching of reading according to the instructional principles of the intervention.…

Studies of high-school science course sequences have been limited primarily to a small number of site-specific investigations comparing traditional science sequences (e.g., Biology-Chemistry-Physics: BCP) to various Physics First-influenced sequences (Physics-Chemistry-Biology: PCB). The present study summarizes a five-year program evaluation…

The extraction of cooccurrences between two events, A and B, is a central learning mechanism shared by all species capable of associative learning. Formally, the cooccurrence of events A and B appearing in a sequence is measured by the transitional probability (TP) between these events, and it corresponds to the probability of the second stimulus…

This study aimed to find out the dependence of myeloperoxidase content in patients living in the environmentally unfriendly region of Kazakhstan (Taraz), on the PCBs content in the air. During this study, 324 patients were examined to solve the clinical problem. The content of myeloperoxidase fluctuated significantly depending on the age of the…

Improving science, technology, engineering, and mathematics (STEM) education has become a national priority and the call to modernize secondary science has been heard. A Physics First (PF) program with the curriculum sequence of physics, chemistry, and biology (PCB) driven by inquiry- and project-based learning offers a viable alternative to the…