STONE TOOL FUNCTIONS, HOUSEHOLD ACTIVITIES, AND FORMATIVE LITHIC ECONOMIES IN NORTHERN TLAXCALA, MEXICO

2022 ◽  
pp. 1-22
Author(s):  
David P. Walton

Abstract High-magnification use-wear analyses create datasets that enable microeconomic studies of lithic consumption and household activities that complement macroeconomic studies of lithic production and exchange to collectively improve our reconstructions of ancient economies. In recent decades, compositional and technological analyses have revealed how certain obsidian sources and lithic technologies were exploited, produced, and exchanged in Mexico's central highlands region during the Formative period (1500 b.c.–a.d. 100). This article presents use-wear analyses of 275 lithic artifacts from four sites in northern Tlaxcala—Amomoloc (900–650 b.c.), Tetel (750–500 b.c.), Las Mesitas (600–500 b.c.), and La Laguna (600–400 b.c. and 100 b.c.–a.d. 150)—to compare household activities with lithic technologies and evaluate their roles in regional economies. Blades were used for subsistence and domestic crafting; maguey fiber extraction for textile production increased over time, especially in non-elite households. The preparation and consumption of meat acquired by hunting and other methods increased slightly over time, and bipolar tools were used as kitchen utensils. Bloodletting was practiced with two variations of late-series pressure blades, but these and other tools were neither exchanged as nor used to craft prestige goods, often viewed as driving forces of Formative economies in Mesoamerica.

1995 ◽  
Vol 6 (2) ◽  
pp. 129-144 ◽  
Author(s):  
Kazuo Aoyama

Based on the results of 267 replication experiments with obsidian, chalcedony, and agate tools conducted with a range of working materials, I have classified use-wear patterns using Keeley's high-resolution approach to establish a framework for interpretation of stone-tool use. This paper describes the results of microwear analysis of two assemblages of lithic artifacts from the late Late Classic period (A. D. 763-850) at Copán, western Honduras, and shows how the use-wear data can be interpreted within the archaeological contexts and help to investigate how ancient complex societies functioned as well as how and why they changed. Microwear analysis of chipped-stone artifacts collected in front of Structure 10L-16 and artifacts from Structure 10L-22A show clear differences between the two assemblages. In accordance with the archaeological, epigraphic, and iconographic evidence, the low use-intensity of chipped stone from the first structure could have originated from special use such as ritual, production of marine shell ornaments, etc., during the reign of Yax Pac. Marine shell craft production may have been carried out by members of the royal family or attached specialists serving the ruler. The relatively high use-intensity observable in the second assemblage may reinforce the hypothesis that the building was a Classic Maya popol na (council house) in which feasts or banquets were prepared. If this was the case, use-wear data might support epigraphic and iconographic evidence that suggests the weakening and eventual demise of centralized political authority at Copán in the ninth century.


2019 ◽  
Vol 25 (29) ◽  
pp. 3098-3111 ◽  
Author(s):  
Luca Liberale ◽  
Giovanni G. Camici

Background: The ongoing demographical shift is leading to an unprecedented aging of the population. As a consequence, the prevalence of age-related diseases, such as atherosclerosis and its thrombotic complications is set to increase in the near future. Endothelial dysfunction and vascular stiffening characterize arterial aging and set the stage for the development of cardiovascular diseases. Atherosclerotic plaques evolve over time, the extent to which these changes might affect their stability and predispose to sudden complications remains to be determined. Recent advances in imaging technology will allow for longitudinal prospective studies following the progression of plaque burden aimed at better characterizing changes over time associated with plaque stability or rupture. Oxidative stress and inflammation, firmly established driving forces of age-related CV dysfunction, also play an important role in atherosclerotic plaque destabilization and rupture. Several genes involved in lifespan determination are known regulator of redox cellular balance and pre-clinical evidence underlines their pathophysiological roles in age-related cardiovascular dysfunction and atherosclerosis. Objective: The aim of this narrative review is to examine the impact of aging on arterial function and atherosclerotic plaque development. Furthermore, we report how molecular mechanisms of vascular aging might regulate age-related plaque modifications and how this may help to identify novel therapeutic targets to attenuate the increased risk of CV disease in elderly people.


2020 ◽  
Vol 535 ◽  
pp. 29-37 ◽  
Author(s):  
Peiqi Zhang ◽  
Xiaoling Zhang ◽  
Nicolas Zwyns ◽  
Fei Peng ◽  
Jialong Guo ◽  
...  

2018 ◽  
Author(s):  
Umer Zeeshan Ijaz ◽  
Lojika Sivaloganathan ◽  
Aaron Mckenna ◽  
Anne Richmond ◽  
Carmel Kelly ◽  
...  

AbstractChickens are a key food source for humans yet their microbiome contains bacteria that can be pathogenic to humans, and indeed potentially to chickens themselves. Campylobacter is present within the chicken gut and is the leading cause of bacterial foodborne gastroenteritis within humans worldwide. Infection can lead to secondary sequelae such as Guillain-Barré syndrome and stunted growth in children from low-resource areas. Despite the global health impact and economic burden of Campylobacter, how and when Campylobacter appears within chickens remains unclear. As such, there has been a motivation to decrease the number of Campylobacter within chickens and thus reduce the risk of infection to humans. The lack of day-to-day microbiome data with replicates, relevant metadata, and a lack of natural infection studies have delayed our understanding of the chicken gut microbiome and Campylobacter. Here, we performed a comprehensive day-to-day microbiome analysis of the chicken cecum from day 3 to 35 (12 replicates each day; n=396) combining metadata such as chicken weight and feed conversion rates to investigate what the driving forces are for the microbial changes within the chicken gut over time, and how this relates to Campylobacter appearance within a natural habitat setting. We found a rapidly increasing microbial diversity up to day 12 with variation observed both in terms of genera and abundance, before a stabilisation of the microbial diversity after day 20. In particular, we identified a shift from competitive to environmental drivers of microbial community from days 12 to 20 creating a window of opportunity whereby Campylobacter appears. Campylobacter was identified at day 16 which was one day after the most substantial changes in metabolic profiles observed. In addition, microbial variation over time is most likely influenced by the diet of the chickens whereby significant shifts in OTU abundances and beta dispersion of samples often corresponded with changes in feed. This study is unique in comparison to the most recent studies as neither sampling was sporadic nor Campylobacter was artificially introduced, thus the experiments were performed in a natural setting. We believe that our findings can be useful for future intervention strategies and can help elucidate the mechanism through which Campylobacter within chickens can be reduced.


Author(s):  
Nailia Fakhrutdinova

The article deals with the problem of the post Arabic spring situation. Only three Arab countries remained unchanged in Africa: Morocco, Algeria and Sudan. After a long period of time their protesters remained outside the zone of active action, but over time they appeared in the streets again. The circumstances forced people to take to the streets. Moroccans were in a better situation, but gradually the population of Algeria and Sudan where the situation was especially serious began to criticize the policy of the authorities, although they did it exclusively peacefully. For the first time in Russian African studies, the author assesses all the driving forces of the events at the end of 2020 and early 2021 and, emphasizing the complications brought by the coronavirus pandemic, makes an analytical forecast for the further development of the situation.


Author(s):  
Marc D. Marino ◽  
Lucas R. Martindale Johnson ◽  
Nathan J. Meissner

This chapter presents a case study of a previously excavated lithic sample from Santa Rita Corozal, considering stone tool production at two structures, 216 and 218. Both exhibit a higher number of Postclassic chert and chalcedony lithic artifacts than other contemporary structures excavated at the site. The authors use debitage analysis to reveal how two households crafted formal tools locally and visual sourcing analysis to better understand how these tools articulated with broader traditions of lithic craft production in a regional exchange network. In contrast to the commercial level of production exhibited at Colha, Belize, these households used a variety of source materials and produced a less standardized tool kit on a much smaller scale.


Author(s):  
Luiz Antonio Joia

In 1994, the Sloan School of Management at MIT inaugurated a multi-year research and education initiative called “Inventing the Organizations of the 21st Century”, headed by Thomas Malone, Director, Center for Coordination Science. One of the key activities of this initiative has been developing a series of coherent scenarios of possible future organizations. The Scenario Working Group considered a wide variety of possible driving forces, major uncertainties, and logics that might shape 21st century organizations. Two scenarios were then created addressing the size and the modus-operandi of the future organizations: “Small Companies, Large Networks”, as the one found in Northern Italy (Textile Production in the Prato region of Italy), and “Virtual Countries”, as more mergers and acquisitions are turning up worldwide (e.g., Exxon and Mobil) (Laubacher & Malone, 1997).


Ethnohistory ◽  
1989 ◽  
Vol 36 (2) ◽  
pp. 227
Author(s):  
Johan Kamminga ◽  
Suzanne M. Lewenstein
Keyword(s):  
Tool Use ◽  

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