Results 81 to 90 of about 34,064 (228)

PCA‐Based Peak Feature Selection for Classification of Spectroscopic Datasets

Journal of Chemometrics, Volume 39, Issue 11, November 2025.
ABSTRACT Reducing feature dimensionality in spectroscopic data is crucial for efficient analysis and classification. Using all available features for classification typically results in an unacceptably high runtime and poor accuracy. Popular feature extraction methods, such as principal component analysis (PCA), linear discriminant analysis (LDA), and ...
Ingo Schmitt, Kay Sowoidnich, Tapashi Gosswami, Bernd Sumpf, Martin Maiwald, Matthias Wolff   +5 more
wiley   +1 more source

Viability and Motility of Escherichia coli Under Elevated Martian Salt Stresses

Life
This study investigates the effects of three Martian-relevant salts—sodium chlorate, sodium perchlorate, and sodium chloride—on the viability and motility of Escherichia coli, a model organism for understanding microbial responses to environmental stress.
Max Riekeles, Berke Santos, Sherif Al-Morssy Youssef, Dirk Schulze-Makuch   +3 more
doaj   +1 more source

Basaltic Terrains in Idaho and Hawai‘i as Planetary Analogs for Mars Geology and Astrobiology

Astrobiology, 2019
Field research target regions within two basaltic geologic provinces are described as Earth analogs to Mars. Regions within the eastern Snake River Plain of Idaho and the Big Island of Hawai‘i, the United States, provinces that represent analogs of ...
S. Hughes, C. Haberle, S. Nawotniak, A. Sehlke, W. Garry, R. Elphic, S. Payler, A. Stevens, C. Cockell, A. Brady, J. Heldmann, J. Heldmann, D. Lim   +12 more
semanticscholar   +1 more source

Maximizing Scientific Exploitation of Raman Spectroscopy With A.C.M.E. (Atmospheric Chamber for Measurements in Environment)

Journal of Raman Spectroscopy, Volume 56, Issue 11, Page 1394-1403, November 2025.
Simulated planetary gas detection using the A.C.M.E. chamber and a novel hollow‐core fiber Raman sensor. Controlled atmospheric mixtures were used to evaluate the sensor’s performance, demonstrating its capability to detect gases such as CO₂, O₂, and N₂. The results support the applicability of the HCF‐based Raman sensor in future planetary exploration
I. Reyes‐Rodríguez, S. Julve‐Gonzalez, M. Veneranda, J. A. Manrique, A. Sanz‐Arranz, M. Mayoral‐Yagüe, S. Jiménez‐Blázquez, L. Asenjo‐Estévez, E. Charro‐Huerga, J. Delgado‐Iglesias, E. A. Lalla, B. Barrios‐Areinamo, F. Rull, G. Lopez‐Reyes   +13 more
wiley   +1 more source

A New Record for Microbial Perchlorate Tolerance: Fungal Growth in NaClO₄ Brines and its Implications for Putative Life on Mars

Life, 2020
The habitability of Mars is strongly dependent on the availability of liquid water, which is essential for life as we know it. One of the few places where liquid water might be found on Mars is in liquid perchlorate brines that could form via ...
Jacob Heinz, Tim Krahn, Dirk Schulze-Makuch   +2 more
doaj   +1 more source

Variations in climate habitability parameters and their effect on Earth's biosphere during the Phanerozoic Eon

Scientific Reports, 2023
Essential insights on the characterization and quality of a detectable biosphere are gained by analyzing the effects of its environmental parameters. We compiled environmental and biological properties of the Phanerozoic Eon from various published data ...
Iva Vilović, Dirk Schulze-Makuch, René Heller   +2 more
doaj   +1 more source

Astrochemistry and Astrobiology: Materials Science in Wonderland?

International Journal of Molecular Sciences, 2019
Astrochemistry and astrobiology, the fascinating disciplines that strive to unravel the origin of life, have opened unprecedented and unpredicted vistas into exotic compounds as well as extreme or complex reaction conditions of potential relevance for a ...
M. d’Ischia, P. Manini, M. Moracci, R. Saladino, V. Ball, H. Thissen, R. Evans, C. Puzzarini, V. Barone   +8 more
semanticscholar   +1 more source

Determine the Elemental Composition of Minerals From Complex Solid‐Solution Series by Raman Spectroscopy: Implications for Mars Exploration Missions

Journal of Raman Spectroscopy, Volume 56, Issue 11, Page 1404-1417, November 2025.
This study presents a hierarchical Raman‐based classification model for determining the elemental composition of garnets within complex solid‐solution systems. The workflow combines spectral preprocessing, dimensionality reduction, and two‐level classification: first distinguishing between pyralspite and ugrandite groups, and then classifying ...
Sofia Julve‐Gonzalez, Jose Antonio Manrique, Marco Veneranda, Pilar Renedo, Paula Xiaozhen Vega, Iván Reyes‐Rodríguez, María Mayoral, Sergio Jiménez, Lidia Asenjo, Aurelio Sanz‐Arranz, Elena Charro Huerga, Jaime Delgado Iglesias, Olga Prieto‐Ballesteros, Andoni Moral, Emmanuel Alexis Lalla, Belen Barrios‐Areinamo, Fernando Rull, Guillermo Lopez‐Reyes   +17 more
wiley   +1 more source

Microbial preference for chlorate over perchlorate under simulated shallow subsurface Mars-like conditions

Scientific Reports
The Martian surface and shallow subsurface lacks stable liquid water, yet hygroscopic salts in the regolith may enable the transient formation of liquid brines.
Florian Carlo Fischer, Dirk Schulze-Makuch, Jacob Heinz   +2 more
doaj   +1 more source

Dependence of Biological Activity on the Surface Water Fraction of Planets

, 2019
One of the unique features associated with the Earth is that the fraction of its surface covered by land is comparable to that spanned by its oceans and other water bodies.
Lingam, Manasvi, Loeb, Abraham
core   +1 more source