Synthesis of fused silica by flame hydrolysis

Apparatus to synthesize and dope high purity, optical quality fused silica by flame hydrolysis was constructed. Fused silica samples containing 0, \u3c35, 35 and 90 ppm niobium were synthesized and characterized by the following properties: purity, refractive index, radiation damage resistance, and transmission spectra. The properties of the undoped sample were shown to be comparable to those of available commercial fused silica. Deviations in the properties of the doped samples from those of the undoped samples were explained in terms of the niobium content --Abstract, page ii

Foraging opportunity: a method of monitoring shorebird migration and overwintering sites in a changing environment

Roberts Bank within the Fraser River estuary, BC contains important migratory stopover and overwintering habitat for shorebirds such as the western sandpiper (Calidris mauri) and the Pacific dunlin (Calidris alpina pacifica). Shorebirds are especially abundant during northward migration, with single-day counts numbering into the hundreds of thousands of birds. Previous research and ecological theory have demonstrated that site usage by shorebirds is influenced by numerous factors, including prey availability and predation risk. We developed a concept termed “foraging opportunity” that quantifies shorebird food availability (biofilm, meiofauna, and macrofauna) in relation to predation danger from hunting falcons. Foraging opportunity was determined across Roberts Bank during northward migration and evaluated against shorebird usage for the same period. Model results agreed with prior research and foraging theories, demonstrating good alignment between prey resources and shorebird usage in safer foraging areas and a shift in usage into areas with less prey, but safer foraging conditions, when high prey abundances were located in more dangerous conditions close to shore. As shorebird migration and overwintering sites are potentially affected by a changing environment, including climate change and anthropogenic effects, we suggest foraging opportunity techniques as a method of understanding and monitoring site quality and shorebird distribution patterns in a changing world

The Rourke Baby Record Infant/Child Maintenance Guide: do doctors use it, do they find it useful, and does using it improve their well-baby visit records?

Background. The Rourke Baby Record (RBR) - http://www.rourkebabyrecord.ca - is a freely available evidence-based structured form for child health surveillance from zero to five years. Family physicians/general practitioners (FP/GPs) doing office based well-baby care in three Ontario Canada cities (London, Ottawa, and Toronto) were randomly sampled to study the prevalence and utility of the RBR and documentation of well-baby visits. Methods. Database with telephone confirmation was conducted to assess the prevalence of use of the RBR. Study Part 1: Questionnaire mailed to a random sample of 100 RBR users. Outcome measures were utility of, helpfulness of, and suggestions for the RBR. Descriptive analysis was employed. Study Part 2: Retrospective chart review of well-baby visits by 38 FP/GPs using student t-tests and factor analysis. Outcome measures were well-baby visit documentation of growth, nutrition, safety issues, developmental milestones, physical examination, and overall comprehensiveness. Results. The RBR was used by 78.5% (402/512) of successfully contacted FP/GPs who did well-baby care in these 3 cities. Study Part 1: Questionnaire respondents (N = 41/100) used the RBR in several ways, and found it most helpful for assessing healthy child development, charting/recording the visits, managing time effectively, addressing parent concerns, identifying health problems, and identifying high risk situations. The RBR was seen to be least helpful as a tool for managing or for referring identified health problems. Study Part 2: Charts from a total of 1,378 well-baby visits on 176 children were audited. Well-baby care provided by the 20 FP/GPs who used the RBR compared to that by the 18 non-users was statistically more likely to include documentation of type of feeding (p = 0.023), discussion of safety issues (p < 0.001), assessment of development (p = 0.001), and overall comprehensiveness (p < 0.001). Well-baby care provided by the RBR users compared to that by the non-users was not more likely to include documentation of measurement of growth (p = 0.097), or physical examination (p = 0.828). Conclusion. The RBR was widely used by FP/GPs in these settings. RBR users found it helpful for many purposes, and had a consistently high rate of documentation of many aspects of well-baby care. The Rourke Baby Record has become a de facto gold standard clinical practice tool in knowledge translation for pediatric preventive medicine and health surveillance for primary care pediatric providers

Retention of provisionally licensed international medical graduates: a historical cohort study of general and family physicians in Newfoundland and Labrador

ABSTRACT Background: To alleviate the shortage of primary care physicians in rural communities, the Canadian province of Newfoundland and Labrador (NL) introduced provisional licensure for international medical graduates (IMGs), allowing them to practise in under-served communities while completing licensing requirements. Although provisional licensing has been seen as a needed recruitment strategy, little is known about its impact on physician retention. To assess the relationship between provincial retention time and type of initial practice licence, we compared the retention of: (1) IMGs who began practice with a provisional licence; (2) fully licensed Memorial University medical graduates (MMGs); and (3) fully licensed medical graduates from other Canadian medical schools (CMGs). Methods: Using administrative data from the NL College of Physicians and Surgeons, the 2004 Scott’s Medical Database, and the Memorial University postgraduate database, we identified family physicians/general practitioners (FPs/GPs) who began their practice in NL in the period 1997–2000 and determined where they were in 2004. We used Cox regression to examine differences in retention among these 3 groups of physicians. Results: There were 42 MMGs, 38 CMGs and 77 IMGs in our sample. The median time for IMGs to qualify for full licensure was 15 months. Twenty-one physicians (13.4%) stayed in NL after beginning their practice (35.7% MMGs, 5.3% CMGs, 5.2% IMGs; p < 0.000). The median retention time was 25 months (MMGs, 39 months; CMGs, 22 months; IMGs, 22 months; p < 0.000). After controlling for Certificant of the College of Family Physicians status, CMGs (hazard ratio [HR] = 2.15; 95% confidence interval [CI] 1.29–3.60) and IMGs (HR = 2.03; 95% CI 1.26–3.27) were more likely to leave NL than MMGs. Conclusions: Provisional licensing accounts for the largest proportion of new primary care physicians in NL but does not lead to long-term retention of IMGs. However, IMG retention is no worse than the retention of CMGs

“I Understood You, But There was This Pronunciation Thing…”: L2 Pronunciation Feedback in English/French Tandem Interactions

We hope that our data brings a valuable and fairly unique contribution to SLA research, helping to establish which errors get corrected and how it may have implications for setting priorities in L2 pronunciation teaching

The effects of hibernation on the contractile and biochemical properties of skeletal muscles in the thirteen-lined ground squirrel, Ictidomys tridecemlineatus

Hibernation is a crucial strategy of winter survival used by many mammals. During hibernation, thirteen-lined ground squirrels, Ictidomys tridecemlineatus, cycle through a series of torpor bouts, each lasting more than a week, during which the animals are largely immobile. Previous hibernation studies have demonstrated that such natural models of skeletal muscle disuse cause limited or no change in either skeletal muscle size or contractile performance. However, work loop analysis of skeletal muscle, which provides a realistic assessment of in vivo power output, has not previously been undertaken in mammals that undergo prolonged torpor during hibernation. In the present study, our aim was to assess the effects of 3 months of hibernation on contractile performance (using the work loop technique) and several biochemical properties that may affect performance. There was no significant difference in soleus muscle power output-cycle frequency curves between winter (torpid) and summer (active) animals. Total antioxidant capacity of gastrocnemius muscle was 156% higher in torpid than in summer animals, suggesting one potential mechanism for maintenance of acute muscle performance. Soleus muscle fatigue resistance was significantly lower in torpid than in summer animals. Gastrocnemius muscle glycogen content was unchanged. However, state 3 and state 4 mitochondrial respiration rates were significantly suppressed, by 59% and 44%, respectively, in mixed hindlimb skeletal muscle from torpid animals compared with summer controls. These findings in hindlimb skeletal muscles suggest that, although maximal contractile power output is maintained in torpor, there is both suppression of ATP production capacity and reduced fatigue resistance

Exhaustive Exercise Training Enhances Aerobic Capacity in American Alligator (\u3ci\u3eAlligator Mississippiensis\u3c/i\u3e)

The oxygen transport system in mammals is extensively remodelled in response to repeated bouts of activity, but many reptiles appear to be ‘metabolically inflexible’ in response to exercise training. A recent report showed that estuarine crocodiles (Crocodylus porosus) increase their maximum metabolic rate in response to exhaustive treadmill training, and in the present study, we confirm this response in another crocodilian, American alligator (Alligator mississippiensis). We further specify the nature of the crocodilian training response by analysing effects of training on aerobic [citrate synthase (CS)] and anaerobic [lactate dehydrogenase (LDH)] enzyme activities in selected skeletal muscles, ventricular and skeletal muscle masses and haematocrit. Compared to sedentary control animals, alligators regularly trained for 15 months on a treadmill (run group) or in a flume (swim group) exhibited peak oxygen consumption rates higher by 27 and 16%, respectively. Run and swim exercise training significantly increased ventricular mass (~11%) and haematocrit (~11%), but not the mass of skeletal muscles. However, exercise training did not alter CS or LDH activities of skeletal muscles. Similar to mammals, alligators respond to exercise training by increasing convective oxygen transport mechanisms, specifically heart size (potentially greater stroke volume) and haematocrit (increased oxygen carrying-capacity of the blood). Unlike mammals, but similar to squamate reptiles, alligators do not also increase citrate synthase activity of the skeletal muscles in response to exercise

WONCA Rural Medical Education Guidebook

We are very excited to launch the WONCA Rural Medical Education Guidebook at the 12th WONCA World Rural Health Conference, Gramado, Brazil. The roots for the Guidebook go back to 1992 when a very important meeting was held on the sidelines of the WONCA Global Family Doctor conference in Vancouver, Canada. At this meeting an interested group of rural practitioners saw the need for WONCA to develop a specific focus on rural doctors. As a result, the WONCA Working Party on Rural Practice (WWPRP) was formed. The group set about producing a visionary roadmap for rural medical education in the form of a seminal document, the WONCA policy on Training for Rural Practice 1995. This was followed four years later by further recommendations made in a companion document, the WONCA policy on Rural Health and Rural Practice 1999, which was revised in 2001