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Tytuł:
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Tardigrade indexing approach on exoplanets.
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Autorzy:
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Jagadeesh MK; Department of Physics, Jyoti Nivas College, Bengaluru, Karnataka 560095, India. Electronic address: .
Roszkowska M; Department of Animal Taxonomy and Ecology, Faculty of Biology, Adam Mickiewicz University, Poznań, Umultowska 89, Poznań 61-614, Poland; Department of Bioenergetics, Faculty of Biology, Adam Mickiewicz University, Poznań, Umultowska 89, Poznań 61-614, Poland. Electronic address: .
Kaczmarek Ł; Department of Animal Taxonomy and Ecology, Faculty of Biology, Adam Mickiewicz University, Poznań, Umultowska 89, Poznań 61-614, Poland. Electronic address: .
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Źródło:
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Life sciences in space research [Life Sci Space Res (Amst)] 2018 Nov; Vol. 19, pp. 13-16. Date of Electronic Publication: 2018 Aug 08.
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Typ publikacji:
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Journal Article
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Język:
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English
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Imprint Name(s):
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Original Publication: Amsterdam : Elsevier Ltd, [2014]-
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MeSH Terms:
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Extraterrestrial Environment*
Planets*
Solar System*
Tardigrada*
Exobiology/*methods
Animals ; Temperature ; Water
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Substance Nomenclature:
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059QF0KO0R (Water)
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Entry Date(s):
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Date Created: 20181129 Date Completed: 20190123 Latest Revision: 20190123
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Update Code:
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20240105
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DOI:
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10.1016/j.lssr.2018.08.001
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PMID:
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30482276
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Finding life on other worlds is a fascinating area of astrobiology and planetary sciences. Presently, over 3800 exoplanets, representing a very wide range of physical and chemical environments, are known. Scientists are not only looking for traces of life outside Earth, but they are also trying to find out which of Earth's known organisms (ex: tardigrades (water bears)) would be able to survive on other planets. In our study, we have established a metric tool for distinguishing the potential survivability of active and cryptobiotic tardigrades on rocky-water and water-gas planets in our solar system and exoplanets, taking into consideration the geometrical means of six physical parameters such as radius, density, escape velocity, revolution period, surface temperature, and surface pressure of the considered planets. More than 3800 exoplanets are available as the main sample from Planetary Habitable Laboratory - Exoplanet Catalog (PHL-EC), from which we have chosen 57 exoplanets in our study including Earth and Mars, with water composition as reference. The Active Tardigrade Index (ATI) and Cryptobiotic Tardigrade Index (CTI) are two metric indices with minimum value 0 (= tardigrades cannot survive) and maximum 1 (= tardigrades will survive in their respective state). Values between 0 and 1 indicate a percentage chance of the active or cryptobiotic tardigrades surviving on a given exoplanet. Among known planets some of the exoplanets are tabulated as ATI and CTI indices for sample representation like: Kepler-100d, Kepler-48d, Kepler-289b, TRAPPIST-1 f and Kepler-106e. The results with Mars as the threshold indicates that Mars could be the only rock-water composition planet that could be more suitable for tardigrades than other considered exoplanets.
(Copyright © 2018. Published by Elsevier Ltd.)