The archaeological potential of Wogan Cavern (Pembroke, UK):Results of the first fieldwork season

Funding Information: Acknowledgements Many thanks are due to numerous people for their help with our work on Wogan Cavern, including (but not limited to) Jon Williams and the staff at Pembroke Castle, Sian Williams, several colleagues at Dyfed Archaeological Trust, Mark Lewis and Eloise Chapman at Tenby Museum, and Louise Mees at Cadw. We are also grateful to the reviewers for a careful reading of this article and for providing some insightful comments, and to David Lowe, whose comments and advice benefitted the final version of the Paper. The work described here and that planned for the future is funded by the Natural History Museum’s Human Origins Research Fund, the BCRA’s CSTRF scheme, and the Prehistoric Society. ELJ acknowledges the Belspo-ICHIE project for funding her contribution to this research.Peer reviewedPublisher PD

Piezo1 integration of vascular architecture with physiological force

The mechanisms by which physical forces regulate endothelial cells to determine the complexities of vascular structure and function are enigmatic¹⁻⁵. Studies of sensory neurons have suggested Piezo proteins as subunits of Ca²⁺-permeable non-selective cationic channels for detection of noxious mechanical impact⁶⁻⁸. Here we show Piezo1 (Fam38a) channels as sensors of frictional force (shear stress) and determinants of vascular structure in both development and adult physiology. Global or endothelial-specific disruption of mouse Piezo1 profoundly disturbed the developing vasculature and was embryonic lethal within days of the heart beating. Haploinsufficiency was not lethal but endothelial abnormality was detected in mature vessels. The importance of Piezo1 channels as sensors of blood flow was shown by Piezo1 dependence of shear-stress-evoked ionic current and calcium influx in endothelial cells and the ability of exogenous Piezo1 to confer sensitivity to shear stress on otherwise resistant cells. Downstream of this calcium influx there was protease activation and spatial reorganization of endothelial cells to the polarity of the applied force. The data suggest that Piezo1 channels function as pivotal integrators in vascular biology

Development and Implementation of a Computer-Based Learning System in Chemical Engineering

This paper describes the development and implementation of a computer-based learning system for the University of Missouri - Rolla (UMR) chemical engineering curriculum. The project has three major goals: provide a learner-centered study environment for our students, integrate the learning system into the department assessment plan and redesign a traditional classroom for synchronous delivery of the learning system. Systems like WebCT and BlackBoard are gaining popularity for course authoring and web-based delivery of course content; however, no single system meets all project goals. The current paper discusses our rationale in selecting the base software and provides a detailed description of the system hardware, software and the new classroom. The most time consuming effort involves the design and development of the resource modules; particularly those that involve mathematical equations, graphics or a high degree of interactivity. This paper discusses the steps involved in this process and provides examples of what can be done with current technology. Some sample content pages and assessment results from the undergraduate thermodynamics course are provided

Advances in anion binding and sensing using luminescent lanthanide complexes

Luminescent lanthanide complexes have been actively studied as selective anion receptors for the past two decades. Ln(iii) complexes, particularly of europium(iii) and terbium(iii), offer unique photophysical properties that are very valuable for anion sensing in biological media, including long luminescence lifetimes (milliseconds) that enable time-gating methods to eliminate background autofluorescence from biomolecules, and line-like emission spectra that allow ratiometric measurements. By careful design of the organic ligand, stable Ln(iii) complexes can be devised for rapid and reversible anion binding, providing a luminescence response that is fast and sensitive, offering the high spatial resolution required for biological imaging applications. This review focuses on recent progress in the development of Ln(iii) receptors that exhibit sufficiently high anion selectivity to be utilised in biological or environmental sensing applications. We evaluate the mechanisms of anion binding and sensing, and the strategies employed to tune anion affinity and selectivity, through variations in the structure and geometry of the ligand. We highlight examples of luminescent Ln(iii) receptors that have been utilised to detect and quantify specific anions in biological media (e.g. human serum), monitor enzyme reactions in real-time, and visualise target anions with high sensitivity in living cells