Facilitating inquiry-based science learning online in a virtual university

The purpose of this paper is to illustrate the authors’ interaction-engagement approach in facilitating online courses, which focused on a guided inquiry approach to build understanding of core science concepts using hands-on experimental science investigations. The graduate-level courses were taught during 2005 through 2010, entirely online. The course participants were practicing teachers who were enrolled in the K-8 Science Specialization of a Master of Science in Education degree program. It was presumed that teachers undertook this graduate program to improve their content knowledge, as well as for their professional advancement in their teaching careers and, for some, financial incentives from their state. The courses in this graduate program integrated science and pedagogy; the science and pedagogy components of the courses were facilitated by two different people online: a scientist and a science educator. Most of the program participants were employed fulltime as teachers. For this reason, the weekly sessions began on Fridays to enable them to start their hands-on investigations during the weekend. The authors observed that group discussions and facilitators’ postings that foster interactive engagement support collaborative learning among participants in online discussion boards.DOI: 10.18870/hlrc.v3i2.10

Assessment of regional myocardial blood flow and regional fractional oxygen extraction in dogs, using 15O-water and 15O-hemoglobin

A new approach to the assessment of regional myocardial blood flow and fractional oxygen extraction has been developed using 15O-water (H2- 15O) and 15O-hemoglobin (15O-Hb). Bolus doses (1 mCi) of H2-15O and 15O- Hb were injected 10 minutes apart into the left main coronary artery of 12 normal dogs. Sequential images of regional myocardial tracer clearance were obtained over 5 minutes with a positron camera. Myocardial blood flow calculated from the monoexponential washout of H2- 15O after background correction was 78 +/- 6 (SE) ml/100 g per min. Functional images of regional blood flow in which the image of peak activity was divided by the integrated image of H2-15O washout were derived by computer processing. These images demonstrated homogeneous blood flow in the normal myocardium. Fractional myocardial O2 extraction was determined from an image of initial distribution of O2 used (obtained by extrapolating back to time zero the series of images obtained after 15O-Hb administration), divided by initial distribution of O2 delivered (obtained by back extrapolating H2-15O washout). These functional images showed uniform distribution of fractional O2 extraction in the normal myocardium. Thus, these studies show that regional myocardial blood flow and regional oxygen extraction can be measured simultaneously by sequential imaging after serial intracoronary injections of H2-15O and 15O-Hb

Interaction of Neutrons with Alpha Particles: A Tribute to Heinz Barschall

As a tribute to our teacher and mentor on the occasion of his centennial celebration, we provide a brief historical overview and a summary of sustained interest in the topic of interaction of neutrons with alpha particle

Facilitating inquiry-based science learning online in a virtual university

The authors reviewed their approaches to facilitating inquiry-based science courses from 2005 through 2010 in a fully online master's degree program at Walden University designed to help teachers bring inquiry-based science to their students. The purpose of this paper is to illustrate their interaction-engagement approach in facilitating online courses, which focused on a guided inquiry approach to build understanding of core science concepts using hands-on experimental science investigations.SIN FINANCIACIÓNNo data 201