Respecting the ancestors? Iron age life and 4th/3rd millennia BCE rock art within hillfort of Briteiros, NW of Portugal

There has been in recent years much interest in the Iron Age hillfort of Briteiros, near Guimaraes, NW of Portugal. The site was extensively excavated in the late 19th century, in the beginning and in the 70s of the 20th century and more recently in the 21st century. Recent research has focused on the substantial rock art assemblage that is scattered over much of the site (the highest slopes and the summit of the hill of the settlement). This rock art assemblage comprises mainly of abstract motifs within the Atlantic Rock Art (Neo-Calcolithic); however there are several panels that display later imagery dating fiom Bronze Age, Iron Age and/or Romanization. In this paper we pose several questions including: was there an understanding, either as ancestral markers or as socio-political devices between the Iron Age inhabitants and the prehistoric rock art? There are around 2500 years separating the rock art from the Iron Age activity on the hill. Furthermore, we are interested in discussing the implication of the ideology behind the concept of respecting the rock art by a later group of inhabitants of the hill.info:eu-repo/semantics/acceptedVersio

Divergent effect of mammalian PLCζ in generating Ca2+ oscillations in somatic cells compared with eggs

Sperm PLCζ (phospholipase Cζ) is a distinct phosphoinositide-specific PLC isoform that is proposed to be the physiological trigger of egg activation and embryo development at mammalian fertilization. Recombinant PLCζ has the ability to trigger Ca2+ oscillations when expressed in eggs, but it is not known how PLCζ activity is regulated in sperm or eggs. In the present study, we have transfected CHO (Chinese-hamster ovary) cells with PLCζ fused with either YFP (yellow fluorescent protein) or luciferase and found that PLCζ-transfected cells did not display cytoplasmic Ca2+ oscillations any differently from control cells. PLCζ expression was not associated with changes in CHO cell resting Ca2+ levels, nor with a significantly changed Ca2+ response to extracellular ATP compared with control cells transfected with either YFP alone, a catalytically inactive PLCζ or luciferase alone. Sperm extracts containing PLCζ also failed to cause Ca2+ oscillations in CHO cells. Despite these findings, PLCζ-transfected CHO cell extracts exhibited high recombinant protein expression and PLC activity. Furthermore, either PLCζ-transfected CHO cells or derived cell extracts could specifically cause cytoplasmic Ca2+ oscillations when microinjected into mouse eggs. These data suggest that PLCζ-mediated Ca2+ oscillations may require specific factors that are only present within the egg cytoplasm or be inhibited by factors present only in somatic cell lines

Cellular Automata Applications in Shortest Path Problem

Cellular Automata (CAs) are computational models that can capture the essential features of systems in which global behavior emerges from the collective effect of simple components, which interact locally. During the last decades, CAs have been extensively used for mimicking several natural processes and systems to find fine solutions in many complex hard to solve computer science and engineering problems. Among them, the shortest path problem is one of the most pronounced and highly studied problems that scientists have been trying to tackle by using a plethora of methodologies and even unconventional approaches. The proposed solutions are mainly justified by their ability to provide a correct solution in a better time complexity than the renowned Dijkstra's algorithm. Although there is a wide variety regarding the algorithmic complexity of the algorithms suggested, spanning from simplistic graph traversal algorithms to complex nature inspired and bio-mimicking algorithms, in this chapter we focus on the successful application of CAs to shortest path problem as found in various diverse disciplines like computer science, swarm robotics, computer networks, decision science and biomimicking of biological organisms' behaviour. In particular, an introduction on the first CA-based algorithm tackling the shortest path problem is provided in detail. After the short presentation of shortest path algorithms arriving from the relaxization of the CAs principles, the application of the CA-based shortest path definition on the coordinated motion of swarm robotics is also introduced. Moreover, the CA based application of shortest path finding in computer networks is presented in brief. Finally, a CA that models exactly the behavior of a biological organism, namely the Physarum's behavior, finding the minimum-length path between two points in a labyrinth is given.Comment: To appear in the book: Adamatzky, A (Ed.) Shortest path solvers. From software to wetware. Springer, 201

The Bryn Celli Ddu Minecraft Experience: A Workflow and Problem-Solving Case Study in the Creation of an Archaeological Reconstruction in Minecraft for Cultural Heritage Education

This article explores the technical and interpretative issues surrounding the creation of a Minecraft Education Edition world for use by primary age school children (5-11 years). The project team undertook to create a Minecraft version of the prehistoric landscape surrounding the Neolithic passage tomb of Bryn Celli Ddu, Anglesey, Wales, United Kingdom. The workflow described here details the process from the initial aims of the project, designed to integrate heritage and STEM education; through the processing of lidar data to create the topography of the world; through the archaeological reconstruction; and then final release. An understanding of the workflow is particularly important for researchers and educators because the successful delivery of our aims resulted in a number of technical obstacles inherent in creating a Minecraft world when a designer is required to navigate several versions of the program - Java architecture, C++ architecture, and the Education Edition - and explains workarounds developed to overcome these issues. The article also considers the interpretative compromises required to translate complex archaeological remains into an accessible and engaging experience for school children set within the strictures of a program that allows a maximum physical resolution of a 1 × 1 m voxel block

'To live and die [for] Dixie': Irish civilians and the Confederate States of America

Around 20,000 Irishmen served in the Confederate army in the Civil War. As a result, they left behind, in various Southern towns and cities, large numbers of friends, family, and community leaders. As with native-born Confederates, Irish civilian support was crucial to Irish participation in the Confederate military effort. Also, Irish civilians served in various supporting roles: in factories and hospitals, on railroads and diplomatic missions, and as boosters for the cause. They also, however, suffered in bombardments, sieges, and the blockade. Usually poorer than their native neighbours, they could not afford to become 'refugees' and move away from the centres of conflict. This essay, based on research from manuscript collections, contemporary newspapers, British Consular records, and Federal military records, will examine the role of Irish civilians in the Confederacy, and assess the role this activity had on their integration into Southern communities. It will also look at Irish civilians in the defeat of the Confederacy, particularly when they came under Union occupation. Initial research shows that Irish civilians were not as upset as other whites in the South about Union victory. They welcomed a return to normalcy, and often 'collaborated' with Union authorities. Also, Irish desertion rates in the Confederate army were particularly high, and I will attempt to gauge whether Irish civilians played a role in this. All of the research in this paper will thus be put in the context of the Drew Gilpin Faust/Gary Gallagher debate on the influence of the Confederate homefront on military performance. By studying the Irish civilian experience one can assess how strong the Confederate national experiment was. Was it a nation without a nationalism