An ichnological predictive map of the Jezero Crater, Mars: searching for potential traces of life-substrate interactions based on terrestrial analogues (Liguria, Italy; Naturtejo UNESCO Geopark, Portugal; Ômnôgov, Mongolia)

2021 ◽  
Author(s):  
Andrea Baucon ◽  
Carlos Neto De Carvalho ◽  
Antonino Briguglio ◽  
Fabrizio Felletti ◽  
Michele Piazza
Keyword(s):  
Landing Site ◽  
Predictive Modelling ◽  
Search Efficiency ◽  
Substrate Interactions ◽  
Environmental Attributes ◽  
Scant Attention ◽  
Single Attribute ◽  
Past Life ◽  
Predictive Map ◽  
Bacteria And Fungi

<p>Seeking signs of past life in the geological record of Mars is one of the four primary goals of the NASA Mars 2020 mission. However, scant attention has been paid to the fossilized products of life-substrate interactions (ichnofossils), which are one of the most abundant and reliable biosignatures on Earth. This lack of attention is surprising because the ichnofossil heritage does not include only metazoan tracks, but also macroscopic burrows produced by bacteria, microborings ascribed to the activity of bacteria and fungi, and biostratification structures produced by archaea, cyanobacteria and euglenozoans. In light of this gap, the goal of the present study is evaluating the suitability of the Mars 2020 Landing Site for ichnofossils. To this goal, this work applies palaeontological predictive modelling, a technique used to predict the location of fossil sites in uninvestigated areas on Earth. Accordingly, a GIS of the landing site is developed. Each layer of the GIS maps the suitability for one or more ichnofossil types (bioturbation, bioerosion, biostratification structure) based on an assessment of a single attribute (suitability factor) of the Martian environment. Suitability criteria have been selected among the environmental attributes that control ichnofossil abundance, preservation, and accessibility in W Liguria (Italy), Naturtejo UNESCO Geopark (Portugal), and Ômnôgov district (Mongolia). The goal of this research will be delivered through a predictive map showing which areas of the Mars 2020 landing site are more likely to preserve ichnofossils. This map can be used to guide future efforts to the regions of the Mars 2020 Landing Site with the highest ichnological potential, realizing benefits in life-search efficiency and cost‐reduction.</p>

scholarly journals A predictive model for the ichnological suitability of the Jezero crater, Mars: searching for fossilized traces of life-substrate interactions in the 2020 Rover Mission Landing Site

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e11784
Author(s):  
Andrea Baucon ◽  
Carlos Neto de Carvalho ◽  
Antonino Briguglio ◽  
Michele Piazza ◽  
Fabrizio Felletti
Keyword(s):  
Scientific Evidence ◽  
Landing Site ◽  
Predictive Modelling ◽  
Reference Sites ◽  
Extraterrestrial Life ◽  
Substrate Interactions ◽  
Environmental Attributes ◽  
Observation Strategy ◽  
Single Attribute ◽  
Past Life

Ichnofossils, the fossilized products of life-substrate interactions, are among the most abundant biosignatures on Earth and therefore they may provide scientific evidence of potential life that may have existed on Mars. Ichnofossils offer unique advantages in the search for extraterrestrial life, including the fact that they are resilient to processes that obliterate other evidence for past life, such as body fossils, as well as chemical and isotopic biosignatures. The goal of this paper is evaluating the suitability of the Mars 2020 Landing Site for ichnofossils. To this goal, we apply palaeontological predictive modelling, a technique used to forecast the location of fossil sites in uninvestigated areas on Earth. Accordingly, a geographic information system (GIS) of the landing site is developed. Each layer of the GIS maps the suitability for one or more ichnofossil types (bioturbation, bioerosion, biostratification structures) based on an assessment of a single attribute (suitability factor) of the Martian environment. Suitability criteria have been selected among the environmental attributes that control ichnofossil abundance and preservation in 18 reference sites on Earth. The goal of this research is delivered through three predictive maps showing which areas of the Mars 2020 Landing Site are more likely to preserve potential ichnofossils. On the basis of these maps, an ichnological strategy for the Perseverance rover is identified, indicating (1) 10 sites on Mars with high suitability for bioturbation, bioerosion and biostratification ichnofossils, (2) the ichnofossil types, if any, that are more likely to be present at each site, (3) the most efficient observation strategy for detecting eventual ichnofossils. The predictive maps and the ichnological strategy can be easily integrated in the existing plans for the exploration of the Jezero crater, realizing benefits in life-search efficiency and cost-reduction.

Antagonism against phytopathogenic bacteria and fungi and phytoregulating activity of streptomycetes of chernozems Moldova

2019 ◽  
Vol 326 (1) ◽  
pp. 131-136
Author(s):  
S.A. Burtseva ◽  
◽  
M.N. Byrsa ◽  
S.N. Maslobrod ◽  
◽  
...  
Keyword(s):  
Phytopathogenic Bacteria ◽  
Bacteria And Fungi

On the Margins of Modernism

2017 ◽  
Author(s):  
Christopher Rosenmeier
Keyword(s):  
Short Stories ◽  
Detailed Analysis ◽  
Chinese Literature ◽  
Popular Literature ◽  
Extensive Study ◽  
Wide Range ◽  
Chinese Fiction ◽  
Scant Attention ◽  
Narrative Techniques ◽  
Chinese Writing

Xu Xu and Wumingshi were among the most widely read authors in China during and after the Second Sino-Japanese War (1937–1945). Despite being an integral part of the Chinese literary scene, their bestselling fiction has, however, been given scant attention in histories of Chinese writing. This book is the first extensive study of Xu Xu and Wumingshi in English or any other Western language and it re-establishes their importance within the popular Chinese literature of the 1940s. Their romantic novels and short stories were often set abroad and featured a wide range of stereotypes, from pirates, spies and patriotic soldiers to ghosts, spirits and exotic women who confounded the mostly cosmopolitan male protagonists. Christopher Rosenmeier’s detailed analysis of these popular novels and short stories shows that such romances broke new ground by incorporating and adapting narrative techniques and themes from the Shanghai modernist writers of the 1930s, notably Shi Zhecun and Mu Shiying. The study thereby contests the view that modernism had little lasting impact on Chinese fiction, and it demonstrates that the popular literature of the 1940s was more innovative than usually imagined, with authors, such as those studied here, successfully crossing the boundaries between the popular and the elite, as well as between romanticism and modernism, in their bestselling works.

Cultivating Intimacy

2009 ◽  
Vol 3 (1) ◽  
pp. 51-69 ◽  
Author(s):  
James Bielo
Keyword(s):  
Social Practice ◽  
Symbolic Interaction ◽  
Bible Study ◽  
Relational Spirituality ◽  
Restoration Movement ◽  
Study Approach ◽  
The Bible ◽  
Study Experience ◽  
Scant Attention ◽  
American Evangelicalism

In this article I contribute to the sociology and anthropology of American Evangelicalism by examining the discourse of group Bible study. Every week millions of Christians in the U.S. meet for group study, and in doing so, actively negotiate the categories of meaning central to their faith. Yet, this crucial practice has received scant attention from scholars. This study is grounded in theories of social practice and symbolic interaction, where cultural life is understood through its vital institutions, and institutions are treated as inter-subjective accomplishments. I employ the concept of ‘interactive frames’ to define how Evangelicals understand the Bible study experience. Ultimately, I argue that the predominant interactive frame for Evangelicals is that of cultivating intimacy, which directly reflects the type of personalized, relational spirituality characteristic of their faith. This, in turn, has serious consequences for how Bible reading and interpretation are performed in groups. I use a case study approach, providing close ethnographic analyses of a mixed-gender group from a Restoration Movement congregation.

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