Results 61 to 70 of about 9,833 (194)

Mars simulated exposure and the characteristic Raman biosignatures of amino acids and halophilic microbes [PDF]

, 2017
Though Raman bands of α-amino acids (AA) are well documented, often only the strongest intensity bands are quoted as identifiers (e.g. Jenkins et al., 2005; De Gelder et al., 2007; Zhu et al., 2011).
Gilmour, I., McGenity, T. J., Olsson-Francis, K., Patel, M. R., Ringrose, T. J., Rolfe, S. M.   +5 more
core  

Quadruple Helix Inversions of Liquid Crystals Orchestrated by Direct Chirality Transmission of an Intrinsically Chiral Light‐Driven Molecular Machine

Advanced Materials, Volume 38, Issue 4, 16 January 2026.
A molecular motor with four‐state dynamic chirality is integrated into liquid crystals, enabling quadruple sequential helix inversions and high helical twisting power. Due to high motor efficiency, the supramolecular helicity can be controlled by near‐infrared light via upconversion nanoparticles, resulting in a robust, multistate, photoresponsive soft
Jinyu Sheng, Alexander Ryabchun, Guiying Long, Ben L. Feringa   +3 more
wiley   +1 more source

Unveiling microbial preservation under hyperacidic and oxidizing conditions in the Oligocene Rio Tinto deposit

Scientific Reports, 2021
The preservation of biosignatures on Mars is largely associated with extensive deposits of clays formed under mild early Noachian conditions (> 3.9 Ga). They were followed by widespread precipitation of acidic sulfates considered adverse for biomolecule ...
David C. Fernández-Remolar, Daniel Carrizo, Mourad Harir, Ting Huang, Ricardo Amils, Philippe Schmitt-Kopplin, Laura Sánchez-García, David Gomez-Ortiz, Per Malmberg   +8 more
doaj   +1 more source

A Programmable, 3D Neuron‐On‐Chip Platform Integrating Near Real‐Time Biosensing and Multiaxial Loading for Mechanobiological Injury Profiling

Advanced Science, Volume 13, Issue 2, 9 January 2026.
A programmable 3D Neuron‐Injury‐on‐a‐Chip platform integrates multiaxial mechanical loading with ultrasensitive electrochemical biosensing to decode neuronal responses in real time. By mimicking physiologically relevant extension–torsion forces, the system reveals load‐specific biomarker trajectories (T‐Tau, NFL), gene regulation, and apoptosis.
Sultan Khetani, Kar Wey Yong, Mawafag F. Alhasadi, Amir Hamedzadeh, Leila Shahsavari, Atefeh Rafiei, Kalvin Wu, Omakhowa Agbojo, Anupriya Singh, Kunal Karan, Salvatore Federico, Arindom Sen, Amir Sanati‐Nezhad   +12 more
wiley   +1 more source

Increased Stability in Carbon Isotope Records Reflects Emerging Complexity of the Biosphere

Frontiers in Earth Science, 2019
Preference for certain stable isotopes (isotope fractionation) during enzyme-mediated reactions is a universal aspect of life. For instance, carbon isotopes are fractionated during anabolic (e.g., photosynthate production) and catabolic (e.g ...
Martin Schobben, Bas van de Schootbrugge
doaj   +1 more source

Interpretable Differential Abundance Signature (iDAS)

Small Methods, Volume 10, Issue 2, 22 January 2026.
iDAS is an ANOVA‐based framework that enhances the interpretability of differential abundance signatures in single‐cell and spatial omics data. It provides a coherent and interpretable framework for grouping gene‐level associations in complex experimental designs.
Lijia Yu, Yingxin Lin, Xiangnan Xu, Pengyi Yang, Jean Y. H. Yang   +4 more
wiley   +1 more source

Assessing the utility of trace and rare earth elements as biosignatures in microbial iron oxyhydroxides

Frontiers in Earth Science, 2015
Microbial iron oxyhydroxides are common deposits in natural waters, recent sediments and mine drainage systems and often contain significant accumulations of trace and rare earth elements (TREE). TREE patterns are widely used to characterize minerals and
Christine eHeim, Klaus eSimon, Danny eIonescu, Andreas eReimer, Dirk eDe Beer, Nadia-Valérie eQuéric, Joachim eReitner, Volker eThiel   +7 more
doaj   +1 more source

Directly Imaging Rocky Planets from the Ground [PDF]

, 2019
Over the past three decades instruments on the ground and in space have discovered thousands of planets outside the solar system. These observations have given rise to an astonishingly detailed picture of the demographics of short-period planets, but are
Artigau, É., Bailey, V., Baranec, C., Beichman, C., Benneke, B., Birkby, J., Bose, S. N., Brandt, T., Chilcote, J., Chun, M., Close, L., Crossfield, I., Currie, T., Dekany, R., Delorme, J. R., Dong, C., Dong, R., Doyon, R., Dressing, C., Fitzgerald, M., Fortney, J., Frazin, R., Gaidos, E., Guyon, O., Hashimoto, J., Hillenbrand, L., Howard, A., Jensen-Clem, R., Jovanovic, N., Kawahara, H., Knutson, H., Konopacky, Q., Kotani, T., Liu, M., Lozi, J., Lu, J., Macintosh, B., Males, J., Marley, M., Marois, C., Mawet, D., Mazin, B., Meeker, S., Millar-Blanchaer, M., Mondal, S., Murakami, N., Murray-Clay, R., Narita, N., Pyo, T. S., Roberts, L., Ruane, G., Serabyn, G., Shields, A., Simard, L., Skemer, A., Stelter, D., Tamura, M., Troy, M., Vasisht, G., Wallace, J. K., Wang, J., Wang, J., Wright, S.   +62 more
core   +1 more source

Spectral signatures of photosynthesis II: coevolution with other stars and the atmosphere on extrasolar worlds

, 2007
As photosynthesis on Earth produces the primary signatures of life that can be detected astronomically at the global scale, a strong focus of the search for extrasolar life will be photosynthesis, particularly photosynthesis that has evolved with a ...
Antígona Segura, David Crisp, Giovanna Tinetti, Govindjee, , Janet Siefert, Leger A., Leger A., Martin Cohen, Nancy Y. Kiang, Robert E. Blankenship, Tucker C.J., Victoria S. Meadows, Wang A.   +12 more
core   +2 more sources

The THEMIS Control Network of Mars

Earth and Space Science, Volume 13, Issue 1, January 2026.
Abstract The accurate co‐registration of geospatial data is necessary to answer questions that cross‐cut disciplines and are key to understanding fundamental questions about our Solar System. To address this need and provide an updated product for Mars that is tied to a common reference frame, we have photogrammetrically controlled Thermal Emission ...
R. L. Fergason, L. Weller, M. T. Bland
wiley   +1 more source