Christopher J. Johnston

Learn More
What knowledge is needed to teach mathematics with digital technologies? The overarching construct, called technology, pedagogy, and content knowledge (TPACK), has been proposed as the interconnection and intersection of technology, pedagogy, and content knowledge. Mathematics Teacher TPACK Standards offer guidelines for thinking about this construct. A(More)
BACKGROUND Methicillin-resistant Staphylococcus aureus (MRSA) in animals is a rare finding in Sweden. In horses, MRSA was first detected in a screening survey in 2007. In 2008, six clinical cases occurred in an equine hospital, indicating an outbreak. METHOD All MRSA isolates detected, 11 spa-type t011 and one t064 (n = 12), in infected horses (n = 10)(More)
BACKGROUND The first outbreak of methicillin-resistant Staphylococcus aureus (MRSA) infection in horses in Sweden occurred in 2008 at the University Animal Hospital and highlighted the need for improved infection prevention and control. The present study describes interventions and infection prevention control in an equine hospital setting July 2008 - April(More)
This is a descriptive study of tendon pathology with different structural appearances of repair tissue correlated to immunolocalization of cartilage oligomeric matrix protein (COMP) and type I and III collagens and expression of COMP mRNA. The material consists of nine tendons from seven horses (5-25 years old; mean age of 10 years) with clinical(More)
BACKGROUND Orthopaedic injury is the most common reason for lameness and wastage in sport and leisure horses. Studies on racehorses have shown differences in injury risk between trainers and training strategies. The aim was to study between riding school variation in orthopaedic health status by clinical examination and horses age, and control for change of(More)
Whilst dopamine replacement improves cardinal features of Parkinson's disease, chronic levodopa administration is associated with dose-related side effects and not all symptoms are ameliorated, necessitating the development of new treatments. Studies of trishomocubanes, a novel group of sigma ligands, have shown enhanced amphetamine-stimulated striatal(More)
Multiple existing frameworks address aspects of teachers' knowledge for teaching mathematics with technology. This study proposes the integration of several frameworks, including TPACK (Mishra & Koehler, 2006), MKT (Ball, Thames, & Phelps, 2008), and technology evaluation criteria (Battey, Kafai, & Franke, 2005) into a new comprehensive model for(More)
This paper reports the evaluation of a hybrid mathematics methods course for novice teachers. During a fifteen-week semester, participants met face-to-face for approximately 60% of the semester and took advantage of an online format for the other 40% of the semester. Online activities included asynchronous discussion board postings, synchronous chats as an(More)
Her research interests include lesson study and the development of preservice mathematics teachers. Christopher J. Johnston, cjohnst2@ gmu.edu, is a doctoral student at George Mason University interested in preservice and beginning mathematics teachers' use of technology. Joshua Douds, joshua.douds@fcps.edu, is a fourth-grade teacher at Westlawn Elementary(More)
  • 1