Characteristics and role of the exocellular polysaccharides produced by five cyanobacteria isolated from phototrophic biofilms growing on stone monuments

Biofouling ◽  
2012 ◽  
Vol 28 (2) ◽  
pp. 215-224 ◽  
Author(s):  
Federico Rossi ◽  
Ernesto Micheletti ◽  
Laura Bruno ◽  
Siba P. Adhikary ◽  
Patrizia Albertano ◽  
...  
2020 ◽  
Vol 31 (4) ◽  
pp. 817-837 ◽  
Author(s):  
Christina T. Halperin ◽  
Simon Martin

The Terminal Classic period (ca. AD 800–1000) in the Southern Maya Lowlands witnessed a precipitous decline in the erection of carved stone monuments, a decline that corresponds to shifts in political ideologies and the disappearance of many prominent royal dynasties. Although Southern Lowland sites are often considered peripheral to the events and innovations occurring elsewhere in Mesoamerica during this time, a recently discovered stela, Stela 29, at the site of Ucanal in Peten, Guatemala, underscores the active role of the site in broader political movements in the ninth century. Our iconographic, textual, and stylistic analysis of this stela, in concert with other Terminal Classic monuments from the site, reveals a vernacular cosmopolitan aesthetic whereby local Classic Maya styles were infused with images and elements that referenced connections with peoples from northern Yucatan, the Gulf Coast, and Central Mexico.


2017 ◽  
Vol 28 (4) ◽  
pp. 515-540 ◽  
Author(s):  
Christina T. Halperin

Maya figurine styles from the Late Classic to Postclassic periods (ca. AD 600–1521) from central Petén, Guatemala undergo an abrupt change at the Terminal Classic-Postclassic transition (ca. AD 830–1000). Despite the intimate association of figurines with households, such shifts parallel those on stone monuments and decorated vessels, underscoring the role of figurines in processes of political upheaval. Documenting figurine chronologies over broad periods of time, however, tells us little about how people in the past may have experienced temporal changes. Thus, in concert with a focus on figurine chronologies, this article explores the temporalities of figurines as manifested through their discard, the simultaneous experience of old and new figurine styles, and tensions between personal and monumental time.


Life ◽  
2015 ◽  
Vol 5 (2) ◽  
pp. 1218-1238 ◽  
Author(s):  
Federico Rossi ◽  
Roberto De Philippis

2021 ◽  
Vol 30 (4) ◽  
Author(s):  
Eva Matoušková ◽  
Kateřina Kovářová

Stone monuments maintenance requires the systematic approach which should be based on the cooperation among specialist through more branches, especially from humanities, natural and technical sciences. The main aim of this article is to present the benefit of the cooperation among geologists and civil engineers and share preliminary results of the Czech Ministry of Culture project DG20P02OVV021 “Stone surface topography and its application in stone element restoration field”. Historic stone surfaces often contain stonemasons tool traces as an undoubtable part of historical monument value. The study and protection of the testimony of past is therefore very important. As a part of our project, we are conducting field and laboratory research of historic stone surfaces bearing the original tool traces. The studied area is the Prague urban conservation zone for its stone monuments richness from Romanesque to present days. First, the geological research of the stone masonry surface is conducted in the cooperation with archaeologists. The tool traces are documented, and the state of stone is described. Because of the negative influence of weathering processes on the stone durability, respectively tool traces, we decided to monitor the chosen historical stone surface using the hyperspectral analysis. Based on the analysis results we will be able to better understand the behaviour of stone surface and traces on it during the time.


2016 ◽  
Vol 7 (suppl 1: M4) ◽  
pp. 39-54 ◽  
Author(s):  
Ornella Salvadori ◽  
Annalaura C. Municchia
Keyword(s):  

2021 ◽  
Vol 16 (3) ◽  
Author(s):  
Natalija Ćosić

In the wider professional community gathered around the notion of archaeological heritage, there is an undisputed consensus that the material traces have to be preserved for research, education and presentation, for the present and future generations. However, the climate change, pollution, intensive urbanization and other perils present a significant source of risk for archaeological remains in their original settings. Additionally, archaeological evidence may be present in the form of skeletal remains, cave drawings, landscapes or negatives of missing objects or materials. Underwater finds, stone monuments, archaeobotanical traces, fortifications, or wooden sanctuaries may all also constitute archaeological remains. In order to be preserved today, each of these examples requires various conditions, processing of material traces and preservation after excavation. Finally, all these artefacts and ecofacts gain different places in the contemporary context. Bearing in mind the variety of situations and forms in which archaeological finds and material remains may occur, it is necessary to reconsider the scope of the content embraced by the term of archaeological heritage and material traces of the past, under the conditions of rapid and intensive changes. Here the theoretical standpoint is applied derived from Bruno Latour, about the role of various actants, live and non-live participants in social processes. In this sense, objects – artefacts and ecofacts, are parts of diverse processes of negotiation and reshaping of their environment. They can equally influence, entice, stop or change processes. In order to contribute to solving this dilemma, the text discusses the notion of archaeological materialities at the intersection of conservation and archaeological perspectives. It is argued that, when facing the current problems, especially in regard to in situ preservation, the answers and inspiration should be sought for in the wider conceptualization of materiality, as the guide and source of specific knowledges, leading to new theoretical insights.


JAMA ◽  
1966 ◽  
Vol 195 (12) ◽  
pp. 1005-1009 ◽  
Author(s):  
D. J. Fernbach
Keyword(s):  

JAMA ◽  
1966 ◽  
Vol 195 (3) ◽  
pp. 167-172 ◽  
Author(s):  
T. E. Van Metre

2018 ◽  
Vol 41 ◽  
Author(s):  
Winnifred R. Louis ◽  
Craig McGarty ◽  
Emma F. Thomas ◽  
Catherine E. Amiot ◽  
Fathali M. Moghaddam

AbstractWhitehouse adapts insights from evolutionary anthropology to interpret extreme self-sacrifice through the concept of identity fusion. The model neglects the role of normative systems in shaping behaviors, especially in relation to violent extremism. In peaceful groups, increasing fusion will actually decrease extremism. Groups collectively appraise threats and opportunities, actively debate action options, and rarely choose violence toward self or others.


Sign in / Sign up

Export Citation Format

Share Document