Bridging the Gap between the Lab and the Classroom: An Online Citizen Scientific Research Project with Teachers Aiming at Improving Inhibitory Control of School‐Age Children

Online citizen science allows us to bridge the gap between researchers and nonresearchers and to improve the scientific literacy of nonresearchers. The aims of the present study were (a) to determine whether a 5‐week randomized control trial conducted by teachers in their classroom could improve 7‐ to 12‐year‐old children's inhibitory control (IC) and (b) to provide proof of concept that online scientific research projects can provide meaningful results in the context of education. As expected, children in the IC training group improved their IC efficiency to a greater extent than children in the control training group. We provide the first evidence that such online scientific research projects can be effective in improving children's IC abilities and bridge the gap between the lab and the classroom.     

Single cell rheometry with a microfluidic constriction: Quantitative control of friction and fluid leaks between cell and channel walls

We report how cell rheology measurements can be performed by monitoring the deformation of a cell in a microfluidic constriction, provided that friction and fluid leaks effects between the cell and the walls of the microchannels are correctly taken into account. Indeed, the mismatch between the rounded shapes of cells and the angular cross-section of standard microfluidic channels hampers efficient obstruction of the channel by an incoming cell. Moreover, friction forces between a cell and channels walls have never been characterized. Both effects impede a quantitative determination of forces experienced by cells in a constriction. Our study is based on a new microfluidic device composed of two successive constrictions, combined with optical interference microscopy measurements to characterize the contact zone between the cell and the walls of the channel. A cell squeezed in a first constriction obstructs most of the channel cross-section, which strongly limits leaks around cells. The rheological properties of the cell are subsequently probed during its entry in a second narrower constriction. The pressure force is determined from the pressure drop across the device, the cell velocity, and the width of the gutters formed between the cell and the corners of the channel. The additional friction force, which has never been analyzed for moving and constrained cells before, is found to involve both hydrodynamic lubrication and surface forces. This friction results in the existence of a threshold for moving the cells and leads to a non-linear behavior at low velocity. The friction force can nevertheless be assessed in the linear regime. Finally, an apparent viscosity of single cells can be estimated from a numerical prediction of the viscous dissipation induced by a small step in the channel. A preliminary application of our method yields an apparent loss modulus on the order of 100 Pa s for leukocytes THP-1 cells, in agreement with the literature data.     

The regulation of release parameters in underarm precision throwing

The aim of this study was to determine if adults spontaneously exploit the laws of physics to achieve better accuracy when throwing at various distances. Eight adults performed 25 underarm throws at five horizontal circular targets located 4, 5, 6, 7 and 8 m away with a constant 5% relative accuracy requirement. Angle and speed of the ball at release were found to increase with throwing distance, while the coordinates of the release point did not change significantly. These results support the idea that people minimize the variability in impact distance by adapting both the angle and the speed at ball release following a mechanical optimum predicted by the laws of physics. Moreover, variability in distance was found to be less than expected because of independent variations in the angle and speed at ball release. Hence, the control of precision throwing seems to imply compensatory variability, as frequently reported in the control of skilled actions.     

Professional learning community process in the United States: conceptualization of the process and district support for schools

Abstract

As the Professional Learning Community (PLC) process becomes embedded within schools, the level of district support has a direct impact on whether schools have the ability to re-culture and sustain highly effective collaborative practices. The purpose of this article is to share a professional learning community conceptual framework from the US, and to highlight recent findings relating to district level support for the PLC process in schools. The professional learning community conceptual model is organized around five dimensions: shared and supportive leadership, shared values and vision, collaborative learning and application, shared personal practice, and supportive conditions. The overarching question guiding this qualitative research study is: How do school district personnel (central office staff) support schools in the professional learning community process? Findings reveal the importance of transformative and proactive district involvement, and the use of transparency, trust, accountability, and autonomy in school re-culturing. It was also found that developing leadership capacity, embedding professional development, and focusing the culture on student success were critically important. As districts provide support for the PLC dimensions and themes, school leaders will have a foundation of curricular strategies, collaborative skills, and necessary resources to serve teachers and students through continuous school improvement.