A method for the resolution of -alkene-complex isomers of the type MoTp(NO)(DMAP)( -alkene) and WTp(NO)(PMe)( -alkene) (where Tp = hydridotris(pyrazolyl)-borate and DMAP = 4-(dimethylamino)pyridine) has been explored. Alkene and polyene compounds form as a mixture of kinetically trapped isomers. For both types of complexes, it was found that addition of either a fluorinated alcohol or one-electron oxidant reduces the number of isomers in solution. Accelerated ligand exchange was also observed, although these reactions were accompanied by significant decomposition.
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http://dx.doi.org/10.1021/acs.organomet.0c00151 | DOI Listing |
Cell
December 2024
Department of Pharmaceutical Chemistry, University of California, San Francisco, San Francisco, CA 94143, USA; Chan Zuckerberg Biohub, San Francisco, CA 94148, USA; Quantitative Biosciences Institute, University of California, San Francisco, San Francisco, CA 94143, USA; Department of Anesthesia and Perioperative Care, University of California, San Francisco, San Francisco, CA 94115, USA. Electronic address:
Three proton-sensing G protein-coupled receptors (GPCRs)-GPR4, GPR65, and GPR68-respond to extracellular pH to regulate diverse physiology. How protons activate these receptors is poorly understood. We determined cryogenic-electron microscopy (cryo-EM) structures of each receptor to understand the spatial arrangement of proton-sensing residues.
View Article and Find Full Text PDFSci Rep
January 2025
Department of Electrical and Computer Engineering, Hawassa University, Hawassa 05, Ethiopia.
Understanding human behavior and human action recognition are both essential components of effective surveillance video analysis for the purpose of guaranteeing public safety. However, existing approaches such as three-dimensional convolutional neural networks (3D CNN) and two-stream neural networks (2SNN) have computational hurdles due to the significant parameterization they require. In this paper, we offer HARNet, a specialized lightweight residual 3D CNN that is built on directed acyclic graphs and was created expressly to handle these issues and achieve effective human action detection.
View Article and Find Full Text PDFAlzheimers Dement
December 2024
Afe Babalola University, Ado-Ekiti, Ekiti, Nigeria.
Background: Stress during pregnancy and postpartum periods has been associated with short-term cognitive deficits with potential long-term Alzheimer's disease (AD) risk. However, the biological mechanisms mediating these effects remain poorly understood. This study investigated the impacts of recurrent heat and simulated refugee camp stress across pregnancy and the postpartum period on cognition, affective behaviour, and AD neuropathological changes in primiparous rats.
View Article and Find Full Text PDFAlzheimers Dement
December 2024
Institut de l'Audition/Institut Pasteur, Paris, France.
Background: Memory consolidation is an essential process for our everyday lives that is severely disrupted in Alzheimer's Disease (AD). Memories are initially encoded in the hippocampus before being consolidated in the neocortex by synaptic plasticity processes that depend on protein synthesis. However, how molecular pathways affect synaptic signalling during memory consolidation in health and disease is unclear.
View Article and Find Full Text PDFAlzheimers Dement
December 2024
National Council of Scientific and Technical Research (CONICET/UNLP), La Plata, Argentina.
Background: Sporadic Alzheimer's disease (sAD) is the most common form of dementia, characterized by a progressive decline in cognitive function and, cortical and hippocampal atrophy. Our objective is to develop neuroprotective therapies that promote the homeostatic and modulatory properties of astrocytes, and enhance their protective functions. Glial-derived neurotrophic factor (GDNF) has emerged as a promising factor for its ability to promote neuronal survival and function.
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