Older and More Experienced? Comparing Mainland Chinese International Students in Canada on Social Cognitive Correlates of Leisure Time Physical Activity, Acculturation, and Mental Health by Study Year

Background: Physical activity is a mandatory component of many university programs in China and there is evidence that Chinese students value physical activity for health (Chen & Liu, 2008); however, academics are generally prioritized as students advance in their studies (Ha, Macdonald, & Pang, 2010). Among international students in the United States, Asian students were found to have some of the lowest rates of physical activity, which could be linked with many combinations of cultural, environmental, and individual barriers (Yoh, Yang, & Gordon, 2008). Physical activity may aid in healthy transitions for Chinese international students. Aim: Chinese international students were compared by study year on physical activity, mental health, culture, and social cognitive theory variables. Method: First year (n = 92), second year (n = 52), and senior (n = 77) international students studying in Canada were compared on physical activity, self-efficacy, intention, access, stress, acculturative stress, subjective well-being, acculturation, and self-construal. The relationships between the social cognitive, mental health, culture variables, and physical activity were also compared. Results: Senior students perceived fewer places to do physical activity and more discrimination compared to first- and second-year students. Senior students experienced more academic pressure and guilt towards their family compared to second year students. First year students reported more general stress compared to second year students. Self-efficacy, intention, and exercise to reduce stress shared relationships with vigorous physical activity. Subjective well-being was related to moderate physical activity, and self-efficacy and independent self-construal were related to walking. Walking decreased by study year. Conclusions: Physical activity may be used to improve mental health for Chinese international students, but interventions may need to be adjusted or implemented depending on the academic stage of the student

Analysis of leaf surfaces using scanning ion conductance microscopy

Leaf surfaces are highly complex functional systems with well defined chemistry and structure dictating the barrier and transport properties of the leaf cuticle. It is a significant imaging challenge to analyse the very thin and often complex wax-like leaf cuticle morphology in their natural state. Scanning electron microscopy (SEM) and to a lesser extent Atomic force microscopy are techniques that have been used to study the leaf surface but their remains information that is difficult to obtain via these approaches. SEM is able to produce highly detailed and high-resolution images needed to study leaf structures at the submicron level. It typically operates in a vacuum or low pressure environment and as a consequence is generally unable to deal with the in situ analysis of dynamic surface events at submicron scales. Atomic force microscopy also possess the high-resolution imaging required and can follow dynamic events in ambient and liquid environments, but can over exaggerate small features and cannot image most leaf surfaces due to their inherent roughness at the micron scale. Scanning ion conductance microscopy (SICM), which operates in a liquid environment, provides a potential complementary analytical approach able to address these issues and which is yet to be explored for studying leaf surfaces. Here we illustrate the potential of SICM on various leaf surfaces and compare the data to SEM and atomic force microscopy images on the same samples. In achieving successful imaging we also show that SICM can be used to study the wetting of hydrophobic surfaces in situ. This has potentially wider implications than the study of leaves alone as surface wetting phenomena are important in a range of fundamental and applied studies

Fruit and vegetable consumption and all-cause, cancer and CVD mortality : analysis of Health Survey for England data

Background Governments worldwide recommend daily consumption of fruit and vegetables. We examine whether this benefits health in the general population of England. Methods Cox regression was used to estimate HRs and 95% CI for an association between fruit and vegetable consumption and all-cause, cancer and cardiovascular mortality, adjusting for age, sex, social class, education, BMI, alcohol consumption and physical activity, in 65 226 participants aged 35+ years in the 2001–2008 Health Surveys for England, annual surveys of nationally representative random samples of the non-institutionalised population of England linked to mortality data (median follow-up: 7.7 years). Results Fruit and vegetable consumption was associated with decreased all-cause mortality (adjusted HR for 7+ portions 0.67 (95% CI 0.58 to 0.78), reference category <1 portion). This association was more pronounced when excluding deaths within a year of baseline (0.58 (0.46 to 0.71)). Fruit and vegetable consumption was associated with reduced cancer (0.75 (0.59–0.96)) and cardiovascular mortality (0.69 (0.53 to 0.88)). Vegetables may have a stronger association with mortality than fruit (HR for 2 to 3 portions 0.81 (0.73 to 0.89) and 0.90 (0.82 to 0.98), respectively). Consumption of vegetables (0.85 (0.81 to 0.89) per portion) or salad (0.87 (0.82 to 0.92) per portion) were most protective, while frozen/canned fruit consumption was apparently associated with increased mortality (1.17 (1.07 to 1.28) per portion). Conclusions A robust inverse association exists between fruit and vegetable consumption and mortality, with benefits seen in up to 7+ portions daily. Further investigations into the effects of different types of fruit and vegetables are warranted

A transition program to primary health care for new graduate nurses: a strategy towards building a sustainable primary health care nurse workforce?

Background: This debate discusses the potential merits of a New Graduate Nurse Transition to Primary Health Care Program as an untested but potential nursing workforce development and sustainability strategy. Increasingly in Australia, health policy is focusing on the role of general practice and multidisciplinary teams in meeting the service needs of ageing populations in the community. Primary health care nurses who work in general practice are integral members of the multidisciplinary team but this workforce is ageing and predicted to face increasing shortages in the future. At the same time, Australia is currently experiencing a surplus of and a corresponding lack of employment opportunities for new graduate nurses. This situation is likely to compound workforce shortages in the future. A national nursing workforce plan that addresses supply and demand issues of primary health care nurses is required. Innovative solutions are required to support and retain the current primary health care nursing workforce, whilst building a skilled and sustainable workforce for the future. Discussion: This debate article discusses the primary health care nursing workforce dilemma currently facing policy makers in Australia and presents an argument for the potential value of a New Graduate Transition to Primary Health Care Program as a workforce development and sustainability strategy. An exploration of factors that may contribute or hinder transition program for new graduates in primary health care implementation is considered. Summary: A graduate transition program to primary health care may play an important role in addressing primary health care workforce shortages in the future. There are, however, a number of factors that need to be simultaneously addressed if a skilled and sustainable workforce for the future is to be realised. The development of a transition program to primary health care should be based on a number of core principles and be subjected to both a summative and cost-effectiveness evaluation involving all key stakeholders

Relationship between sociodemographic factors and specialty destination of UK trainee doctors:a national cohort study

We are grateful to UKMED for releasing the data for this project. We also are grateful to the following for their support of the application to UKMED for this and other research projects: Dr Sally Curtis (University of Southampton, UK), Dr Sandra Nicholson (Barts and The London School of Medicine and Dentistry, UK). We thank Daniel Smith and Andy Knapton of the General Medical Council of the UK for their support for the application and throughout the project, particularly regarding data linkage and troubleshooting.Peer reviewedPublisher PD

The On/Off Nature of Star-Planet Interactions

Evidence suggesting an observable magnetic interaction between a star and its hot Jupiter appears as a cyclic variation of stellar activity synchronized to the planet's orbit. In this study, we monitored the chromospheric activity of 7 stars with hot Jupiters using new high-resolution echelle spectra collected with ESPaDOnS over a few nights in 2005 and 2006 from the CFHT. We searched for variability in several stellar activity indicators (Ca II H, K, the Ca II infrared triplet, Halpha, and He I). HD 179949 has been observed almost every year since 2001. Synchronicity of the Ca II H & K emission with the orbit is clearly seen in four out of six epochs, while rotational modulation with P_rot=7 days is apparent in the other two seasons. We observe a similar phenomenon on upsilon And, which displays rotational modulation (P_rot=12 days) in September 2005, in 2002 and 2003 variations appear to correlate with the planet's orbital period. This on/off nature of star-planet interaction (SPI) in the two systems is likely a function of the changing stellar magnetic field structure throughout its activity cycle. Variability in the transiting system HD 189733 is likely associated with an active region rotating with the star, however, the flaring in excess of the rotational modulation may be associated with its hot Jupiter. As for HD 179949, the peak variability as measured by the mean absolute deviation for both HD 189733 and tau Boo leads the sub-planetary longitude by 70 degrees. The tentative correlation between this activity and the ratio of Mpsini to the planet's rotation period, a quantity proportional to the hot Jupiter's magnetic moment, first presented in Shkolnik et al. 2005 remains viable. This work furthers the characterization of SPI, improving its potential as a probe of extrasolar planetary magnetic fields.Comment: Accepted for publication in the Astrophysical Journa

Regulation of plasma aldosterone concentration in anephric man and renal transplant recipients

Regulation of plasma aldosterone concentration in anephric man and renal transplant recipients. Regulatory factors controlling plasma aldosterone in the anephric state were further examined in bilaterally nephrectomized patients and renal transplant recipients. The effect of supine and upright posture on the concentration of plasma aldosterone, and the possible role of potassium in these responses in the anephric patients, was studied on the first and either the third or fourth day post-dialysis (anephric patients) and during periods of high and low sodium intake (renal transplant recipients). As previously reported, a significant correlation between plasma aldosterone and serum potassium concentration (r = 0.871, P<0.001) could be demonstrated in anephric patients. In addition, the present studies demonstrate that in a single anephric individual, changes in serum potassium concentration are associated with concordant alterations in plasma aldosterone concentration (r value for Δ plasma aldosterone concentration in anephric patients on the third or fourth day post-dialysis was 0.911, P<0.005). Changes in posture from supine to upright produced no change in the concentration of plasma aldosterone in the anephric patients that could not be attributed to variations in the serum potassium concentration. In contrast, the plasma aldosterone concentration in renal transplant recipients increased significantly after two hours of ambulation during both high and low sodium intake, and was correlated with plasma renin activity (PRA). These studies demonstrate that plasma aldosterone, in the absence of the kidneys, is unresponsive to postural variation under conditions in which significant changes in plasma aldosterone concentrations are observed in renal transplant recipients. Thus, additional evidence indicating that changes in potassium rather than volume-related stimuli are the primary regulator of plasma aldosterone in anephric patients is provided.Régulation de la concentration plasmatique d'aldostérone au cours de l'anéphrie et après la transplantation rénale. Les facteurs régulateurs contrôlant la secrétion d'aldostérone au cours de l'anéphrie ont été étudiés chez des malades ayant subi une néphrectomie bilatérale et chez des transplantés. L'effet de la position couchée ou debout sur la concentration plasmatique d'aldostérone et le rôle possible du potassium dans ces réponses chez le malade anéphrique ont été étudiés le premier et le troisième ou quatrième jour après dialyse (malades anéphriques) et durant des périodes de régime riche puis pauvre en sodium (receveurs de reins transplantés). Ainsi que nous l'avons antérieurement rapporté il existe une corrélation significative entre les concentrations plasmatiques d'aldostérone et de potassium (r = 0,871; P<0,001) chez le malade anéphrique. De surcroît, l'étude actuelle démontre que chez un même sujet anéphrique les modifications de la concentration du potassium sont associées à des modifications concordantes de la concentration plasmatique d'aldostérone (le r de la corrélation Δ du potassium plasmatique avec Δ d'aldostérone plasmatique chez le sujet anéphrique le troisième ou le quatrième jour post dialyse est égal à 0,911; P<0,005). Le passage de la position couchée à la position debout ne produit pas de modification de l'aldostérone plasmatique, chez les sujets anéphriques, qui ne pourraient être attribués aux modifications du potassium plasmatique. Al'opposé, l'aldostérone plasmatique chez les transplantés augmente significativement après 2 heures d'ambulation, que le régime soit riche ou pauvre en sel, et elle est correlée avec l'activité rénine plasmatique. Ces résultats démontrent que la secrétion d'aldostérone, en l'absence de reins, ne répond pas auxh modifications posturales dans des conditions où des modifications significatives de la concentration plasmatique d'aldostérone sont observées chez les sujets transplantés. Ainsi des arguments supplémentaires indiquent que les modifications de potassium, plus que des stimuli volémiques, sont le facteur primaire de la régulation de la secrétion d'aldostérone chez l'anéphrique

An Upper Limit on the Albedo of HD 209458b: Direct Imaging Photometry with the MOST Satellite

We present space-based photometry of the transiting exoplanetary system HD 209458 obtained with the MOST (Microvariablity and Oscillations of STars) satellite, spanning 14 days and covering 4 transits and 4 secondary eclipses. The HD 209458 photometry was obtained in MOST's lower-precision Direct Imaging mode, which is used for targets in the brightness range $6.5 < V < 13$. We describe the photometric reduction techniques for this mode of observing, in particular the corrections for stray Earthshine. We do not detect the secondary eclipse in the MOST data, to a limit in depth of 0.053 mmag (1 \sigma). We set a 1 \sigma upper limit on the planet-star flux ratio of 4.88 x 10^-5 corresponding to a geometric albedo upper limit in the MOST bandpass (400 to 700 nm) of 0.25. The corresponding numbers at the 3 \sigma level are 1.34 x 10^-4 and 0.68 respectively. HD 209458b is half as bright as Jupiter in the MOST bandpass. This low geometric albedo value is an important constraint for theoretical models of the HD209458b atmosphere, in particular ruling out the presence of reflective clouds. A second MOST campaign on HD 209458 is expected to be sensitive to an exoplanet albedo as low as 0.13 (1 sigma), if the star does not become more intrinsically variable in the meantime.Comment: 29 pages, 9 figures. Accepted for publication in the Astrophysical Journal (July 2006, v645n1