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Drug Development.
Alzheimers Dement
December 2024
Vanderbilt University Medical Center, Nashville, TN, USA.
Background: We report the case of a 79-year-old woman with Alzheimer's disease who enrolled in a clinical study of lecanemab. After the third, biweekly infusion she suffered a seizure followed by aphasia and progressive encephalopathy. Magnetic resonance imaging revealed multifocal cerebral edema and an increased burden of cerebral microhemorrhages compared to pre-trial imaging.
View Article and Find Full Text PDFJanus graphene nanoribbons with localized states on a single zigzag edge.
Nature
January 2025
Department of Chemistry, National University of Singapore, Singapore, Singapore.
Topological design of π electrons in zigzag-edged graphene nanoribbons (ZGNRs) leads to a wealth of magnetic quantum phenomena and exotic quantum phases. Symmetric ZGNRs typically show antiferromagnetically coupled spin-ordered edge states. Eliminating cross-edge magnetic coupling in ZGNRs not only enables the realization of a class of ferromagnetic quantum spin chains, enabling the exploration of quantum spin physics and entanglement of multiple qubits in the one-dimensional limit, but also establishes a long-sought-after carbon-based ferromagnetic transport channel, pivotal for ultimate scaling of GNR-based quantum electronics.
View Article and Find Full Text PDFLocal and systemic biodistribution of a small-molecule radiopharmaceutical probe after transcatheter embolization and intra-arterial delivery in a porcine orthotopic renal tumor model.
Nucl Med Commun
February 2025
Department of Radiology, Netherlands Cancer Institute- Antoni van Leeuwenhoekziekenhuis, Amsterdam, The Netherlands.
Background: Small-molecule biomacromolecules target tumor-specific antigens. They are employed as theranostic agents for imaging and treatment. Intravenous small-molecule radioligands exhibit rapid tumor uptake and excretion.
View Article and Find Full Text PDFAtomic Observation on Diamond (001) Surfaces with Near-Contact Atomic Force Microscopy.
Nano Lett
January 2025
Department of Advanced Materials Science, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan.
Achieving atomic-level characterization of the diamond (001) surface has been a persistent goal over recent decades. This pursuit aims to understand the smooth growth of diamonds and investigate surface defects and adsorbates relevant to applications. However, the inherently low conductivity and the short C-C bonds present significant challenges for atomic resolution imaging.
View Article and Find Full Text PDFSpectroscopic and Computational Insights into the Mechanism of Cofactor Cobalt-Carbon Bond Homolysis by the Adenosylcobalamin-Dependent Enzyme Ethanolamine Ammonia-Lyase.
J Am Chem Soc
January 2025
Department of Chemistry, University of Wisconsin─Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States.
The adenosylcobalamin (AdoCbl)-dependent enzyme ethanolamine ammonia-lyase (EAL) catalyzes the conversion of ethanolamine to acetaldehyde and ammonia. As is the case for all AdoCbl-dependent isomerases, the catalytic cycle of EAL is initiated by homolytic cleavage of the cofactor's Co-C bond, producing Cocobalamin (CoCbl) and an adenosyl radical that serves to abstract a hydrogen atom from the substrate. Remarkably, in the presence of substrate, the rate of Co-C bond homolysis of enzyme-bound AdoCbl is increased by 12 orders of magnitude.
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