Effect of the addition of GGBS on the frost scaling and chloride migration resistance of concrete

Ground Granulated Blast-furnace Slag (GGBS) can partially replace cement in concrete to improve certain properties. However, some concerns regarding its performance have been raised. This research aimed at investigating the properties of concrete with GGBS, with special focus on its frost scaling and chloride ingress resistance. Concretes with different amounts of GGBS, different efficiency factors, and different air contents have been tested. The effects of other factors, namely the curing temperature, the use of superplasticizer and carbonation, have also been investigated. The results showed that the frost resistance generally decreases with the increase of the amount of GGBS. However, this research showed that it is possible to produce frost resistant concrete with up to 50% of GGBS by changing some properties of the mix (such as increasing the air content). The results also showed a significant improvement of the chloride ingress resistance for concrete with high additions of GGBS

Physical Activity Plays an Important Role in Body Weight Regulation

Emerging literature highlights the need to incorporate physical activity into every strategy intended to prevent weight gain as well as to maintain weight loss over time. Furthermore, physical activity should be part of any plan to lose weight. The stimulus of exercise provides valuable metabolic adaptations that improve energy and macronutrient balance regulation. A tight coupling between energy intake and energy expenditure has been documented at high levels of physical exercise, suggesting that exercise may improve appetite control. The regular practice of physical activity has also been reported to reduce the risk of stress-induced weight gain. A more personalized approach is recommended when planning exercise programs in a clinical weight loss setting in order to limit the compensatory changes associated to exercise-induced weight loss. With modern environment promoting overeating and sedentary behavior, there is an urgent need for a concerted action including legislative measures to promote healthy active living in order to curb the current epidemic of chronic diseases

Effective teacher professional development: new theory and a meta-analytic test

Multiple meta-analyses have now documented small positive effects of teacher professional development (PD) on pupil test scores. However, the field lacks any validated explanatory account of what differentiates more from less effective in-service training. As a result, researchers have little in the way of advice for those tasked with designing or commissioning better PD. We set out to remedy this by developing a new theory of effective PD based on combinations of causally active components targeted at developing teachers’ insights, goals, techniques, and practice. We test two important implications of the theory using a systematic review and meta-analysis of 104 randomised controlled trials, finding qualified support for our framework. While further research is required to test and refine the theory, we argue that it presents an important step forward in being able to offer actionable advice to those responsible for improving teacher PD

An acoustic sensor transmitter for in situ assessment of water quality and fish behaviour during chemical treatment of a parasite-infected river system : tag design and practical use

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Prevention of neck injury in frontal impacts

'Whiplash' or Soft Tissue Neck Injwy (STNI) has traditionally been recognized as a car-to-car rear impact phenomenon; studies worldwide verify that the risk of sustaining neck injury in a car crash is approximately three-fold the risk of sustaining the same injury in other crash-types. In general, as such injuries are not characterized by a high risk of threat-to-life (as measured by internationally adopted injury severity scales such as the Abbreviated Injury Scale), prevention of them has perhaps not been seen as a high priority. However, in recent times, it has been recognized that such injury can be very debilitating to those afflicted and costs to sociery as a result of the injury can be correspondingly high. Techniques have therefore evolved over the past 5-l0 years that are aimed at the prevention of neck injury, mostly in rear impacts, and these are predominantly based on current understandings of the actual injurycoupled with the injury mechanism. Such studies usually indicate that the design of vehicle seat and head restraint is critical in the prevention of neck injury. However, neck injury does not only occur in rear-end crashes. Some studies have shown that the risk of sustaining neck injury in front and side impacts is between 15-20%. As these crash-types occur more frequently than rear impacts, the actual exposure to neck injury could be higher than in rear impacts. However, so far there have been no design techniques specifically aimed at neck injury prevention in such impacts. Recently, two studies of real-world crashes have examined the effects of arl-bags in frontal impacts. These are reported in this paper. Both studies have shown that the deploying air-bag in conjunction with a seat belt in a frontal crash can significantly reduce the incidence of neck injury in a frontal impact. The first is an on-going study of vehicle crash performance and occupant injury which is being conducted by Folksam Insurance in Sweden using data obtained from on-board crash recorders. The second study uses preliminary data from an on-going study of vehicle crash peiformance and occupant injury, which is being conducted by the Monash Universiy's Accident Research Centre

Myonuclear content regulates cell size with similar scaling properties in mice and humans

Muscle fibers are the largest cells in the body, and one of its few syncytia. Individual cell sizes are variable and adaptable, but what governs cell size has been unclear. We find that muscle fibers are DNA scarce compared to other cells, and that the nuclear number (N) adheres to the relationship N = aVb where V is the cytoplasmic volume. N invariably scales sublinearly to V (b < 1), making larger cells even more DNA scarce. N scales linearly to cell surface in adult humans, in adult and developing mice, and in mice with genetically reduced N, but in the latter the relationship eventually fails when they reach adulthood with extremely large myonuclear domains. Another exception is denervation-atrophy where nuclei are not eliminated. In conclusion, scaling exponents are remarkably similar across species, developmental stages and experimental conditions, suggesting an underlying scaling law where DNA-content functions as a limiter of muscle cell size.publishedVersio

Early goal-directed nutrition in icU patients (EAT-ICU):protocol for a randomised trial

INTRODUCTION: Extensive weight loss has been documented in intensive care unit (ICU) survivors, primarily as the result of muscle loss, leading to impaired physical function and reduced quality of life. The aim of the EAT-ICU trial is to test the effect of early goal-directed protein-energy nutrition based on measured requirements on short-term clinical outcomes and long-term physical quality of life in ICU patients. METHODS: The EAT-ICU trial is a single-centre, randomised, parallel-group trial with concealed allocation and blinded outcome assessment. A total of 200 consecutive, acutely admitted, mechanically ventilated intensive care patients will be randomised 1: 1 to early goal-directed nutrition versus standard of care to show a potential 15% relative risk reduction in the primary outcome measure (physical function) at six months (two-sided significance level alpha = 0.05; power beta = 80%). Secondary outcomes include energy-and protein balances, metabolic control, new organ failure, use of life support, nosocomial infections, ICU- and hospital length of stay, mortality and cost analyses. CONCLUSION : The optimal nutrition strategy for ICU patients remains unsettled. The EAT-ICU trial will provide important data on the effects of early goal-directed proteinenergy nutrition based on measured requirements in these patients.Copenhagen University Hospital; Rigshospitalet; Fresenius Kabi A/S; European Society for Clinical Nutrition and Metabolism (ESPEN)SCI(E)[email protected]

DNA methylation profiling in doxorubicin treated primary locally advanced breast tumours identifies novel genes associated with survival and treatment response

<p>Abstract</p> <p>Background</p> <p>Breast cancer is the most frequent cancer in women and consists of a heterogeneous collection of diseases with distinct histopathological, genetic and epigenetic characteristics. In this study, we aimed to identify DNA methylation based biomarkers to distinguish patients with locally advanced breast cancer who may benefit from neoadjuvant doxorubicin treatment.</p> <p>Results</p> <p>We investigated quantitatively the methylation patterns in the promoter regions of 14 genes (<it>ABCB1</it>, <it>ATM</it>, <it>BRCA1</it>, <it>CDH3</it>, <it>CDKN2A</it>, <it>CXCR4</it>, <it>ESR1</it>, <it>FBXW7</it>, <it>FOXC</it>1, <it>GSTP1</it>, <it>IGF2</it>, <it>HMLH1</it>, <it>PPP2R2B</it>, and <it>PTEN</it>) in 75 well-described pre-treatment samples from locally advanced breast cancer and correlated the results to the available clinical and molecular parameters. Six normal breast tissues were used as controls and 163 unselected breast cancer cases were used to validate associations with histopathological and clinical parameters.</p> <p>Aberrant methylation was detected in 9 out of the 14 genes including the discovery of methylation at the <it>FOXC1 </it>promoter. Absence of methylation at the <it>ABCB1 </it>promoter correlated with progressive disease during doxorubicin treatment. Most importantly, the DNA methylation status at the promoters of <it>GSTP1</it>, <it>FOXC1 </it>and <it>ABCB1 </it>correlated with survival, whereby the combination of methylated genes improved the subdivision with respect to the survival of the patients. In multivariate analysis <it>GSTP1 </it>and <it>FOXC1 </it>methylation status proved to be independent prognostic markers associated with survival.</p> <p>Conclusions</p> <p>Quantitative DNA methylation profiling is a powerful tool to identify molecular changes associated with specific phenotypes. Methylation at the <it>ABCB1 </it>or <it>GSTP1 </it>promoter improved overall survival probably due to prolonged availability and activity of the drug in the cell while <it>FOXC1 </it>methylation might be a protective factor against tumour invasiveness. <it>FOXC1 </it>proved to be general prognostic factor, while <it>ABCB1 </it>and <it>GSTP1 </it>might be predictive factors for the response to and efficacy of doxorubicin treatment. Pharmacoepigenetic effects such as the reported associations in this study provide molecular explanations for differential responses to chemotherapy and it might prove valuable to take the methylation status of selected genes into account for patient management and treatment decisions.</p