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Electronic dynamics created at conical intersections and its dephasing in aqueous solution.
Nat Phys
November 2024
Laboratory of Physical Chemistry, ETH Zürich, Zurich, Switzerland.
A dynamical rearrangement in the electronic structure of a molecule can be driven by different phenomena, including nuclear motion, electronic coherence or electron correlation. Recording such electronic dynamics and identifying its fate in an aqueous solution has remained a challenge. Here, we reveal the electronic dynamics induced by electronic relaxation through conical intersections in both isolated and solvated pyrazine molecules using X-ray spectroscopy.
View Article and Find Full Text PDFMagIC beads for scarce macromolecules.
Elife
January 2025
Laboratory of Biophysical Chemistry of Macromolecules, Institute of Chemical Sciences and Engineering (ISIC), School of Basic Sciences, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
Specialized magnetic beads that bind target proteins to a cryogenic electron microscopy grid make it possible to study the structure of protein complexes from dilute samples.
View Article and Find Full Text PDFStructural changes in troponin during activation of skeletal and heart muscle determined in situ by polarised fluorescence.
Biophys Rev
December 2024
Randall Centre for Cell & Molecular Biophysics, New Hunt's House, Guy's Campus, King's College London, London, UK.
Calcium binding to troponin triggers the contraction of skeletal and heart muscle through structural changes in the thin filaments that allow myosin motors from the thick filaments to bind to actin and drive filament sliding. Here, we review studies in which those changes were determined in demembranated fibres of skeletal and heart muscle using fluorescence for in situ structure (FISS), which determines domain orientations using polarised fluorescence from bifunctional rhodamine attached to cysteine pairs in the target domain. We describe the changes in the orientations of the N-terminal lobe of troponin C (TnC) and the troponin IT arm in skeletal and cardiac muscle cells associated with contraction and compare the orientations with those determined in isolated cardiac thin filaments by cryo-electron microscopy.
View Article and Find Full Text PDFDefense to in groundnut ( L.) is associated with vascular tissue compactness and expression of genes coding for pathogenesis-related (PR) proteins.
3 Biotech
February 2025
Junagadh Agricultural University, Junagadh, Gujarat 362001 India.
Unlabelled: is the causal agent of stem rot of many crops, a highly destructive disease of groundnut ( L). Based on evidence that many groundnut genotypes have an inherent ability to tolerate the pathogenicity of species, twenty-two genotypes of groundnut were screened against infection in sick plot field experiment; four genotypes, namely CS19, GG16, GG20 and TG37A, were selected as being the most tolerant, moderately tolerant, susceptible and highly susceptible to stem rot, respectively. Stem tissues (1cm from the collar region) from infected and healthy plants of four selected genotypes differing in susceptibility were examined using a scanning electron microscope (SEM).
View Article and Find Full Text PDFAdvanced MASnI and PTAA-Integrated ZnO Perovskite Composite: Optimizing Stability and Charge Dynamics for Next-Gen Photobatteries.
ACS Appl Mater Interfaces
January 2025
Department of Physics, Riphah International University, Campus Lahore, Lahore 54000, Pakistan.
To advance off-grid energy solutions, developing flexible photobatteries capable of direct light charging is essential. This study presents an innovative photobattery architecture that incorporates zinc oxide (ZnO) as an electron-transporting and hole-blocking layer, combined with a hybrid methylammonium tin iodide composite with poly-triarylamine (MASnI/PTAA) for light absorption and hole transport. PTAA facilitates efficient hole transport to the anode, thereby enhancing charge separation and reducing recombination losses.
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