Results 11 to 20 of about 5,545 (213)

The history and philosophy of biosignatures [Elektronisk resurs] [PDF]

, 2019
This chapter examines the human search, understanding, and interpretation of biosignatures. It deals with four epistemological issues in the search for signs of life in outer space: (1) conceptualization, how we form concepts of life in astrobiology, how
Dunér, David,, Lund University.
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Semiotics of Biosignatures [PDF]

Southern Semiotic Review, 2018
This article examines the interpretation of biosignatures, the signs of life that could bedetected in outer space. In astrobiology biosignatures could be of various kinds, fossils, molecules, traces, artefacts, structures, electromagnetic waves, etc. The
Dunér, David
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Alternative Methylated Biosignatures I: Methyl Bromide, A Capstone Biosignature [PDF]

The Astrophysical Journal, 2022
The first potential exoplanet biosignature detections are likely to be ambiguous due to the potential for false positives: abiotic planetary processes that produce observables similar to those anticipated from a global biosphere.
Parenteau, Mary N, Fauchez, Thomas J, Leung, Michaela, Schwieterman, Edward W   +3 more
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Biosignatures of the Earth [PDF]

Astronomy & Astrophysics, 2021
ontext. Homochirality is a generic and unique property of life on Earth and is considered a universal and agnostic biosignature. Homochirality induces fractional circular polarization in the incident light that it reflects.
Vidhya Pallichadath, Jens Hoeijmakers, H.,, Stam, Daphne M., Demory, B.O., Spadaccia, S., Demory, Brice Olivier, Poch, Olivier, Spadaccia, Stefano, Mulder, W., Poch, O., Patty, C. H. Lucas, Stefano Spadaccia, Stam, Daphne M.,, Olivier Poch, Snik, Frans, Pommerol, A., Keller, C.U., Stam, D.M., Jonas G. Kühn, H. Jens Hoeijmakers, Patty, C.H.L., Kühn, J.G., Pallichadath, V., Frans Snik, Jens Hoeijmakers, H., Snik, Frans,, Antoine Pommerol, Spadaccia, Stefano,, Keller, Christoph,, Hoeijmakers, H. Jens, Mulder, Willeke,, Brice-Olivier Demory, Kühn, Jonas G., Lambrev, Petar H.,, Petar H. Lambrev, Hoeijmakers, J.H., Daphne M. Stam, Christoph Keller, Poch, Olivier,, Patty, C. H.Lucas,, Demory, Brice Olivier,, Mulder, Willeke, Willeke Mulder, Demory, Brice-Olivier, Snik, F., Lambrev, P.H., Patty, C. H.Lucas, Pommerol, Antoine, Keller, Christoph, Pommerol, Antoine,, C. H. Lucas Patty, Kühn, Jonas G.,, Lambrev, Petar H., Pallichadath, Vidhya   +53 more
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Biosignatures associated with freshwater microbialites [PDF]

Life, 2020
Freshwater microbialites (i.e., lithifying microbial mats) are quite rare in northern latitudes of the North American continent, with two lakes (Pavilion and Kelly Lakes) of southeastern BC containing a morphological variety of such structures.
Sarah A. Soles, Soles, Sarah A., Southam, Gordon, White, Richard Allen, Brady, Allyson L., Richard Allen White, Greg F. Slater, Allyson L. Brady, Darlene S.S. Lim, Lim, Darlene S.S., Gordon Southam, Slater, Greg F.   +11 more
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Biosignatures in Rocks

, 2011
Biosignatures are morphological, chemical (organic, elemental and/or mineral), and isotopic traces of organisms preserved in minerals, sediments, and rocks.
CAVALAZZI, BARBARA, Frances Westall, Barbara Cavalazzi, Westall, Frances, Westall F.   +4 more
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Deciphering Biosignatures in Planetary Contexts [PDF]

Astrobiology, 2019
Microbial life permeates Earth's critical zone and has likely inhabited nearly all our planet's surface and near subsurface since before the beginning of the sedimentary rock record.
Hinman, NW, Gillams, RJ, Southam, G, Chan, MA, Des Marais, DJ, Potter-McIntyre, SL, Leveille, RJ, Papineau, D, Awramik, SM, Bower, DM, Farmer, JD, Stern, JC, Rempfert, KR, Jia, TZ, Boston, PJ, King, PL, Hazen, RM, Schubert, KE, Sanchez-Roman, M, Spear, JR, Cleaves, HJ   +20 more
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Biosignatures for Astrobiology

, 2018
This book aims at providing a brief but broad overview of biosignatures. The topics addressed range from prebiotic signatures in extraterrestrial materials to the signatures characterising extant life as well as fossilised life, biosignatures related to ...
Westall Frances, Cavalazzi, Barbara, Westall, Frances, Cavalazzi Barbara   +3 more
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Atmospheric Biosignatures

, 2017
Life has likely coevolved with the Earth system in time in various ways. Our oxygen-rich atmosphere and the protective ozone layer are mainly the result of photosynthetic activity.
Grenfell, J L, John Lee Grenfell
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Is There Such a Thing as a Biosignature? [PDF]

Astrobiology, 2023
The concept of a biosignature is widely used in astrobiology to suggest a link between some observation and a biological cause, given some context. The term itself has been defined and used in several ways in different parts of the scientific community involved in the search for past or present life on Earth and beyond. With the ongoing acceleration in
Malaterre, Christophe, ten Kate, Inge Loes, Baqué, Mickael, Debaille, Vinciane, Grenfell, John Lee, Javaux, Emmanuelle J., Khawaja, Nozair, Klenner, Fabian, Lara, Yannick J., McMahon, Sean, Moore, Keavin, Noack, Lena, Patty, C.H. Lucas, Postberg, Frank   +13 more
openaire   +6 more sources