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Waste Heat and Habitability: Constraints from Technological Energy Consumption.
Astrobiology
January 2025
Department of Aerospace, Physics and Space Sciences, Florida Institute of Technology, Melbourne, Florida, USA.
Waste heat production represents an inevitable consequence of energy conversion as per the laws of thermodynamics. Based on this fact, by using simple theoretical models, we analyze constraints on the habitability of Earth-like terrestrial planets hosting putative technological species and technospheres characterized by persistent exponential growth of energy consumption and waste heat generation. In particular, we quantify the deleterious effects of rising surface temperature on biospheric processes and the eventual loss of liquid water.
View Article and Find Full Text PDFModulation of the modulated magnetic structure of an Ho i-MAX phase described by a magnetic (3+2)-dimensional superspace group.
Acta Crystallogr B Struct Sci Cryst Eng Mater
February 2025
Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, 18200 Praha 8, Czechia.
The magnetic structures of the Ho-based i-MAX phase (MoHo)GaC were studied with neutron powder diffraction at low temperature. (MoHo)GaC crystallizes in the orthorhombic space group Cmcm. The material undergoes two successive antiferromagnetic transitions at T = 10 K and T = 7.
View Article and Find Full Text PDFAtomic locations and adsorbate interactions of Al single and pair sites in H-ZSM-5 zeolite.
Science
January 2025
Wolfson Catalysis Centre, Department of Chemistry, University of Oxford, Oxford, UK.
The distribution of substitutional aluminum (Al) atoms in zeolites affects molecular adsorbate geometry, catalytic activity, and shape and size selectivity. Accurately determining Al positions has been challenging. We used synchrotron resonant soft x-ray diffraction (RSXRD) at multiple energies near the Al K-edge combined with molecular adsorption techniques to precisely locate "single Al" and "Al pairs" in a commercial H-ZSM-5 zeolite.
View Article and Find Full Text PDFIn Vivo UV-Induced Fluorescence Spectroscopy of Skin in Parkinson's Disease.
Dokl Biol Sci
January 2025
Research Center of Neurology, Moscow, Russia.
Characteristic patterns of UV-induced skin autofluorescence were determined for patients with Parkinson's disease (PD) and associated with dysmetabolic alterations, such as nonenzymatic protein glycation, an increase in extracellular matrix stiffness, impaired metabolism of tissue fluorophores, mitochondrial dysfunction, and accumulation of aberrant proteins. Key differences in skin autofluorescence spectra were for the first time observed in PD, making it possible to discriminate between PD patients and healthy persons or individuals without signs of chronic neurodegeneration. Namely, skin fluorescence related to the reflected signal upon excitation with UV light at 375 nm was lower in PD patients.
View Article and Find Full Text PDFPhospho-Proteomics Analysis of Early Response to X-Ray Irradiation Reveals Molecular Mechanism Potentially Related to U251 Cell Radioresistance.
Proteomes
December 2024
UMR6252 CIMAP, Team Applications in Radiobiology with Accelerated Ions, CEA-CNRS-ENSICAEN, Université de Caen Normandie, 14000 Caen, France.
Glioblastoma (GBM) is a devastating malignant brain tumor with a poor prognosis. GBM is associated with radioresistance. Post-translational modifications (PTMs) such as protein phosphorylation can play an important role in the cellular response to radiation.
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