Jebel Moya (Sudan): new dates from a mortuary complex at the southern Meroitic frontier

This paper proposes a new chronology for the burial complex at Jebel Moya, south-central Sudan. It reassesses the body of evidence from Sir Henry Wellcome's original 1911–1914 excavations in order to place the site within a firm chronological framework by: (a) applying an attribute-based approach to discern discrete pottery assemblages; and (b) applying initial OSL dates to facilitate the reliable dating of this site for the first time. Jebel Moya is re-interpreted as a burial complex situated on the southern periphery of the late Meroitic state, and its potential to serve as a chronological and cultural reference point for future studies in south-central and southern Sudan is outlined

Determining All Universal Tilers

A universal tiler is a convex polyhedron whose every cross-section tiles the plane. In this paper, we introduce a certain slight-rotating operation for cross-sections of pentahedra. Based on a selected initial cross-section and by applying the slight-rotating operation suitably, we prove that a convex polyhedron is a universal tiler if and only if it is a tetrahedron or a triangular prism.Comment: 18 pages, 12 figure

P2Y\u3csub\u3e12\u3c/sub\u3e or P2Y\u3csub\u3e1\u3c/sub\u3e Inhibitors Reduce Platelet Deposition in a Microfluidic Model of Thrombosis while Apyrase Lacks Efficacy Under Flow Conditions

Determination of the patient-specific response to antiplatelet agents facilitates proper dosing for both acute and chronic prophylaxis. Closed systems (with or without flow) may fail to predict pharmacological potency in situations where platelets rapidly accumulate under flow conditions at the site of thrombosis ( Open systems). Using an 8-channel microfluidic flow assay of human whole blood with corn trypsin inhibitor (± PPACK) perfused over focul zones of collagen, dose-response curves were measured for pharmacological agents at a wall shear rate of 210 s-1. The P2Y1 inhibitor MRS 2179 (IC50 = 0.233 ± 0.132 µM) and P2Y12 inhibitor 2-MeSAMP (IC50 = 2.558 ± 0.799 µM) were potent blockers of secondary platelet accumulation under flow, while the P2X1 inhibitor (NF 449) and apyrase failed to reduce platelet accumulation. MRS 2179 and 2-MeSAMP and undetectable effects on initial platelet adhesion to collagen. Numerical simulation of convective-diffusive transport and apyrase-mediated catalytic degradation of ADP indicated that ultra-high concentrations of apyrase (~ 2000 U mL-1) would be required to have the same effect under flow as much lower concentrations (1 U mL-1) currently used in closed systems (aggregometry or cone-and-plate viscometer). This is the first evaluation of IC50 values for P2Y12 and P2Y1 antagonists under controlled flow conditions. Evaluation of antiplatelet agents in open flow systems demonstrates that inhibition of either ADP by apyrase or antagonism of P2X1 signaling had no inhibitory effect on platelet accumulation. This technique provides a platform for rapidly investigating effects of antithrombotic therapies simultaneously in a model injury system

Networked world: Risks and opportunities in the Internet of Things

The Internet of Things (IoT) – devices that are connected to the Internet and collect and use data to operate – is about to transform society. Everything from smart fridges and lightbulbs to remote sensors and cities will collect data that can be analysed and used to provide a wealth of bespoke products and services. The impacts will be huge - by 2020, some 25 billion devices will be connected to the Internet with some studies estimating this number will rise to 125 billion in 2030. These will include many things that have never been connected to the Internet before. Like all new technologies, IoT offers substantial new opportunities which must be considered in parallel with the new risks that come with it. To make sense of this new world, Lloyd’s worked with University College London’s (UCL) Department of Science, Technology, Engineering and Public Policy (STEaPP) and the PETRAS IoT Research Hub to publish this report. ‘Networked world’ analyses IoT’s opportunities, risks and regulatory landscape. It aims to help insurers understand potential exposures across marine, smart homes, water infrastructure and agriculture while highlighting the implications for insurance operations and product development. The report also helps risk managers assess how this technology could impact their businesses and consider how they can mitigate associated risks

Disjoint edges in topological graphs and the tangled-thrackle conjecture

It is shown that for a constant $t\in \mathbb{N}$, every simple topological graph on $n$ vertices has $O(n)$ edges if it has no two sets of $t$ edges such that every edge in one set is disjoint from all edges of the other set (i.e., the complement of the intersection graph of the edges is $K_{t,t}$-free). As an application, we settle the \emph{tangled-thrackle} conjecture formulated by Pach, Radoi\v{c}i\'c, and T\'oth: Every $n$-vertex graph drawn in the plane such that every pair of edges have precisely one point in common, where this point is either a common endpoint, a crossing, or a point of tangency, has at most $O(n)$ edges

A statistical analysis of murine incisional and excisional acute wound models

YesMice represent the most commonly used species for preclinical in vivo research. While incisional and excisional acute murine wound models are both frequently employed, there is little agreement on which model is optimum. Moreover, current lack of standardization of wounding procedure, analysis time point(s), method of assessment, and the use of individual wounds vs. individual animals as replicates makes it difficult to compare across studies. Here we have profiled secondary intention healing of incisional and excisional wounds within the same animal, assessing multiple parameters to determine the optimal methodology for future studies. We report that histology provides the least variable assessment of healing. Furthermore, histology alone (not planimetry) is able to detect accelerated healing in a castrated mouse model. Perhaps most importantly, we find virtually no correlation between wounds within the same animal, suggesting that use of wound (not animal) biological replicates is perfectly acceptable. Overall, these findings should guide and refine future studies, increasing the likelihood of detecting novel phenotypes while reducing the numbers of animals required for experimentation

A New Approach to Low Temperature Embedding: Quick Freezing, Freeze-Drying and Direct Infiltration in Lowicryl K4M

Lowicryl resins are most commonly used for low temperature embedding by progressively lowering the temperature during dehydration. Freeze-substitution has also been successfully used with Lowicryl, but both of these techniques generally rely on chemical fixation and prolonged incubations in organic solvents. Freeze-drying may be combined with embedding in Lowicryl K4M. This technique eliminates all chemical fixation and exposure to organic solvents since the samples are quick-frozen, dried in vacuo and directly infiltrated in pure Lowicryl resin. If a primary aldehyde fixation is desired, freeze-drying may be used as an alternative to dehydration with organic solvents. These new approaches may be of significance for histochemistry and immunohistochemistry

Cleaning of complex soil layers on vertical walls by fixed and moving impinging liquid jets

Cleaning by a horizontal water jet, impinging onto a soiled Perspex vertical plate, is described. The plate, the substrate, was coated with PVA or petroleum jelly, the soil. The substrate was either.(i) fixed, for batch tests in which the cleaned area, roughly circular, grew with time, or(ii) the substrate moved vertically up or down in its own plane, the water jet remaining fixed; this reproduced the effect of a jet moving across a surface for cleaning, as found in real tank cleaning operations.In the batch experiments, growth of the radius a of the cleaning area is well described, at early times t, by a5 – ao5 = K5 (t – to), ao being the initial radius of the cleaned area at time to; K is a constant. At later times with petroleum jelly, the cleaning front reached a maximum value, when the outward momentum of the radially flowing water film balanced the strength of the soil. This maximum value is modelled as a ramp of viscoplastic soil inclined at angle χ to the substrate surface, where χ was found to vary from 7° to 25°.In the tests of continuous cleaning of petroleum jelly, a lengthening cleaned area, of width wc, was observed on the moving substrate. Near the jet was a stationary clean front, whose shape looked like half an ellipse. This shape, and the width wc, are well described by theory (Wilson et al., 2015, 123, 450–459) using parameters from the above-mentioned batch experiments. This establishes a good link between batch and continuous cleaning experiments.Funding for RKB from the Commonwealth Scholarship Commission is gratefully acknowledged, as are helpful conversations with Michael Smith and Paul Hodgson. FDG measurements on the PVA layers were performed by Shiyao Wang.This is the author accepted manuscript. The final version is available from Elsevier via http://dx.doi.org/10.1016/j.jfoodeng.2015.12.02