Results 41 to 50 of about 11,414 (233)

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. We investigated Kelly Lake microbialites using carbon isotope systematics, phospholipid fatty acids (PLFAs ...
Richard Allen White, Sarah A. Soles, Allyson L. Brady, Gordon Southam, Darlene S.S. Lim, Greg F. Slater   +5 more
openaire   +4 more sources

Hierarchical interactions model for predicting Mild Cognitive Impairment (MCI) to Alzheimer's Disease (AD) conversion.

PLoS ONE, 2014
Identifying patients with Mild Cognitive Impairment (MCI) who are likely to convert to dementia has recently attracted increasing attention in Alzheimer's disease (AD) research.
Han Li, Yashu Liu, Pinghua Gong, Changshui Zhang, Jieping Ye, Alzheimers Disease Neuroimaging Initiative   +5 more
doaj   +1 more source

A Plasma 5-Marker Host Biosignature Identifies Tuberculosis in High and Low Endemic Countries

Frontiers in Immunology, 2021
Background: Several host inflammatory markers have been proposed as biomarkers for diagnosis and treatment response in Tuberculosis (TB), but few studies compare their utility in different demographic, ethnic, and TB endemic settings.Methods: Fifty-four ...
Bih H. Chendi, Bih H. Chendi, Candice I. Snyders, Kristian Tonby, Kristian Tonby, Synne Jenum, Martin Kidd, Gerhard Walzl, Novel N. Chegou, Anne M. Dyrhol-Riise, Anne M. Dyrhol-Riise   +10 more
doaj   +1 more source

Fossil biomass preserved as graphitic carbon in a late paleoproterozoic banded iron formation metamorphosed at more than 550°C [PDF]

, 2019
Metamorphism is thought to destroy microfossils, partly through devolatilization and graphitization of biogenic organic matter. However, the extent to which there is a loss of molecular, elemental and isotope signatures from biomass during high ...
De Gregorio, BT, Drost, M, Kilcoyne, DA, Marbach, H, Nittler, L, Papineau, D, Sagar, J, Thornton, G, Thorogate, R, Wang, J   +9 more
core   +2 more sources

A review of exoplanetary biosignatures [PDF]

Physics Reports, 2017
We review the field of exoplanetary biosignatures with a main focus upon atmospheric gas-phase species. Due to the paucity of data in Earth-like planetary atmospheres a common approach is to extrapolate knowledge from the Solar System and Early Earth to Earth-like exoplanets. We therefore review the main processes (e.g.
openaire   +3 more sources

Alternative Methylated Biosignatures. I. Methyl Bromide, a Capstone Biosignature

The Astrophysical Journal, 2022
Abstract The first potential exoplanetary 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. Here we propose a class of methylated gases as corroborative “capstone” biosignatures.
Michaela Leung, Edward W. Schwieterman, Mary N. Parenteau, Thomas J. Fauchez   +3 more
openaire   +6 more sources

SPECULOOS exoplanet search and its prototype on TRAPPIST [PDF]

, 2017
One of the most significant goals of modern science is establishing whether life exists around other suns. The most direct path towards its achievement is the detection and atmospheric characterization of terrestrial exoplanets with potentially habitable
A Burrows, A Collier Cameron, A Wolszczan, Adam J. Burgasser, AR Belu, B Goldman, C Hayashi, C Terquem, CH Blake, CP Johnstone, D Deming, D Kubas, E Agol, E Berger, E Bolmont, E Bolmont, E Jehin, EE Mamajek, ET Whelan, Eunkyu Han, GÁ Bakos, IN Reid, IN Reid, J Leconte, J Muzerolle, J Wit de, J Wit de, J. Schneider, JCB Papaloizou, JD Kirkpatrick, JD Kirkpatrick, JE Gizis, JE Owen, JE Owen, JK Barstow, JN Winn, JS Pineda, KL Luhman, KL Luhman, KL Luhman, L Kaltenegger, L Ricci, L Zeng, M Gillon, M Gillon, M Gillon, M Gillon, M Jura, M Mayor, MC Cushing, MJ Holman, MJ Payne, MY He, P Cresswell, P. Figueira, Philip S. Muirhead, PJ Wheatley, PS Muirhead, R Klein, R Luger, R Luger, R Montgomery, RK Kopparapu, RL Akeson, S Ballard, S Jin, S Seager, S Seager, Sergio B. Dieterich, SJ Schmidt, SN Raymond, SS Kumar, SS Kumar, Stanimir A. Metchev, V Bourrier, X Bonfils, Y Alibert, Y Shvartzvald, ZK Berta   +78 more
core   +1 more source

Nonphotosynthetic Pigments as Potential Biosignatures [PDF]

Astrobiology, 2015
21 pages, 12 figures, 5 tables.
Schwieterman, Edward W, Cockell, Charles S, Meadows, Victoria S   +2 more
openaire   +8 more sources

Exoplanet Biosignatures: Observational Prospects [PDF]

Astrobiology, 2018
part of a series of 5 review manuscripts of the NExSS Exoplanet Biosgnatures ...
Shawn Domagal-Goldman, Shawn Domagal-Goldman, Stephen R. Kane, Enric Palle, Enric Palle, Nicholas Siegler, Heike Rauer, John Lee Grenfell, Karl R. Stapelfeldt, Daniel Angerhausen, Kevin B. Stevenson, Yuka Fujii, Yuka Fujii, Russell Deitrick, Russell Deitrick, Yasunori Hori   +15 more
openaire   +8 more sources

The Cell and the Sum of Its Parts: Patterns of Complexity in Biosignatures as Revealed by Deep UV Raman Spectroscopy

Frontiers in Microbiology, 2019
The next NASA-led Mars mission (Mars 2020) will carry a suite of instrumentation dedicated to investigating Martian history and the in situ detection of potential biosignatures. SHERLOC, a deep UV Raman/Fluorescence spectrometer has the ability to detect
Haley M. Sapers, Haley M. Sapers, Haley M. Sapers, Joseph Razzell Hollis, Rohit Bhartia, Luther W. Beegle, Victoria J. Orphan, Jan P. Amend, Jan P. Amend   +8 more
doaj   +1 more source