Examination of the role of transient receptor potential vanilloid type 4 in endothelial responses to shear forces     

Sara Baratchi  Francisco J. Tovar-Lopez  Khashayar Khoshmanesh  Megan S. Grace  William Darby  Juhura Almazi  Arnan Mitchell  Peter McIntyre 《Biomicrofluidics》2014,8(4)

Shear stress is the major mechanical force applied on vascular endothelial cells by blood flow, and is a crucial factor in normal vascular physiology and in the development of some vascular pathologies. The exact mechanisms of cellular mechano-transduction in mammalian cells and tissues have not yet been elucidated, but it is known that mechanically sensitive receptors and ion channels play a crucial role. This paper describes the use of a novel and efficient microfluidic device to study mechanically-sensitive receptors and ion channels in vitro, which has three independent channels from which recordings can be made and has a small surface area such that fewer cells are required than for conventional flow chambers. The contoured channels of the device enabled examination of a range of shear stresses in one field of view, which is not possible with parallel plate flow chambers and other previously used devices, where one level of flow-induced shear stress is produced per fixed flow-rate. We exposed bovine aortic endothelial cells to different levels of shear stress, and measured the resulting change in intracellular calcium levels ([Ca²⁺]_i) using the fluorescent calcium sensitive dye Fluo-4AM. Shear stress caused an elevation of [Ca²⁺]_i that was proportional to the level of shear experienced. The response was temperature dependant such that at lower temperatures more shear stress was required to elicit a given level of calcium signal and the magnitude of influx was reduced. We demonstrated that shear stress-induced elevations in [Ca²⁺]_i are largely due to calcium influx through the transient receptor potential vanilloid type 4 ion channel.  相似文献   

Exploring athletic identity in elite-level English youth football: a cross-sectional approach     

Tom O. Mitchell  Mark Nesti  David Richardson  Adrian W. Midgley  Martin Eubank 《Journal of sports sciences》2014,32(13):1294-1299

Abstract

This study is the first empirical investigation that has explored levels of athletic identity in elite-level English professional football. The importance of understanding athletes’ psychological well-being within professional sport has been well documented. This is especially important within the professional football industry, given the high attrition rate (Anderson, G., & Miller, R. M. (2011). The academy system in English professional football: Business value or following the herd? University of Liverpool, Management School Research Paper Series. Retrieved from http://www.liv.ac.uk/managementschool/research/working%20papers/wp201143.pdf) and distinct occupational practices (Roderick, M. (2006). The work of professional football. A labour of love? London: Routledge). A total of 168 elite youth footballers from the English professional football leagues completed the Athletic Identity Measurement Scale (AIMS). Multilevel modelling was used to examine the effect of playing level, living arrangements and year of apprentice on the total AIMS score and its subscales (i.e., social identity, exclusivity and negative affectivity). Football club explained 30% of the variance in exclusivity among players (P = .022). Mean social identity was significantly higher for those players in the first year of their apprenticeship compared to the second year (P = .025). All other effects were not statistically significant (P > .05). The novel and unique findings have practical implications in the design and implementation of career support strategies with respect to social identity. This may facilitate the maintenance of motivation over a 2-year apprenticeship and positively impact on performance levels within the professional football environment.  相似文献   

The New Empire of Capital: The Pedagogy of the Streets     

Don Mitchell 《Review of Education, Pedagogy & Cultural Studies》2013,35(1-2):147-151

In every generation, some event serves to remind us that the exercise of power is always in part a function of control over geography.  相似文献   

RELIGIOUS EDUCATION AND RACIAL ADJUSTMENT     

Samuel C. Mitchell LL. D. 《Religious education (Chicago, Ill.)》2013,108(4):316-323

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The fayette,no cost,no credit workshop     

Morris E. Mitchell 《Peabody Journal of Education》2013,88(1):412-416

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On the use of anthracite in the smelting furnace of vizille     

M. Robin 《Journal of The Franklin Institute》1835,19(5):341-347

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Participatory Action Research: issues in theory and practice     

Robin McTaggart 《Educational Action Research》2013,21(3):313-337

Action research is now common in educational and social practices of various kinds. The renaissance of this valuable approach to social enquiry has many virtues, but success is somewhat soured by cooption of some of the techniques occasionally used by action researchers for the technical improvement of practices, the Implicit values of which are poorly understood and timidly questioned. Naive cooption is accompanied by both traditional and new critique. Like most approaches to educational and social research, action research (or some people's impressions of it) has been subjected to critique by theorists of the so‐called post‐modern turn. These critiques have become prematurely Judgemental, and though drawing on what some see as powerful theoretical resources, are somewhat oblivious to the breadth and dynamism of action research theory and practice and dismissive of the achievements of action researchers who often work in contexts decidedly more risky than the academies which nurture and reward critique. Action research remains a diverse and thoroughly Justified and preferred mode of educational and social enquiry, continuing to address the concerns of both its practitioners and its critics.

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Achievement Motivation and Performance Among Second-Grade Boys and Girls     

Donna Mitchell Schell  Joseph Veroff  Robert E. Schell 《Journal of Experimental Education》2013,81(4):66-73

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Public understanding of science: from contents to processes     

Robin Millar  Brian Wynne 《International Journal of Science Education》2013,35(4):388-398

Public understanding of science is commonly seen in terms of lay persons' understanding of the contents of science. This article argues that it may be more salient to consider public understanding of the internal processes of science ‐ of the nature of scientific knowledge and of the sorts of information that science can reasonably be expected to provide. Drawing on the reported statements of non‐scientists in the media following the Chernobyl nuclear reactor accident, the article argues that the view of scientific knowledge that many people appear to hold is not one that can help them interpret and cope successfully with sts issues. The role that formal science education plays in sustaining this unhelpful view of science is discussed and some implications for practice are considered.  相似文献   

Biodeterioration of Incralac used for the protection of bronze monuments   总被引：2，自引：0，他引：2  

Christopher J. McNamara  Margaret Breuker  Marie Helms  Thomas D. Perry  Ralph Mitchell   《Journal of Cultural Heritage》2004,5(4):361-364

Outdoor bronze sculptures are highly susceptible to corrosion in many environments and organic coatings are widely used for their protection. The purpose of this study was to determine the susceptibility of the commonly used coating Incralac to biodeterioration by microorganisms. A yeast was isolated from a bronze statue treated with Incralac and its ability to degrade Incralac was determined using growth curves, scanning electron microscopy (SEM), and electrochemical impedance spectroscopy (EIS). The organism grew slowly on Incralac in liquid culture, but SEM images demonstrated its ability to adhere to Incralac coated metal. Additionally, the yeast caused a rapid drop in the low frequency impedance of Incralac coated metal that was not observed under sterile conditions, indicating that the organism accelerated deterioration of the coating. The potential for microbial growth to accelerate deterioration of Incralac should be considered when developing a maintenance strategy for the protection of outdoor metal monuments.  相似文献