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Geochemical speciation and activation risks of Cd, Ni, and Zn in soils with naturally high background in karst regions of southwestern China.
J Hazard Mater
January 2025
MOE Key Laboratory of Surficial Geochemistry, School of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210023, China. Electronic address:
Agricultural soils in karst regions present a remarkable paradox where high geochemical background levels of heavy metals correspond with unexpectedly low crop uptake, challenging traditional risk assessment frameworks and limiting agricultural development. To decode this paradox, we investigated the geochemical speciation of cadmium (Cd), nickel (Ni), and zinc (Zn) in soil-rice systems in southwestern China, which collectively constitute the world's largest continuous karst region and represent diverse soil weathering stages. We employed three chemical extraction methods that revealed reactive pools ranking as Cd (58.
View Article and Find Full Text PDFSelective Mu-Opioid Receptor Imaging Using F-Labeled Carfentanils.
J Med Chem
January 2025
Gordon Center for Medical Imaging, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts 02114, United States.
Carfentanil, a highly potent synthetic opioid, paradoxically serves as a crucial positron emission tomography (PET) imaging tool in neurobiological studies of the mu-opioid receptor (MOR) system when labeled with carbon-11 ([C]CFN). However, its clinical research use is hindered by extreme potency and the limited availability of short-lived carbon-11 ( = 20.4 min).
View Article and Find Full Text PDFReconciling Archean organic-rich mudrocks with low primary productivity before the Great Oxygenation Event.
Proc Natl Acad Sci U S A
January 2025
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125.
The organic carbon content of ancient rocks provides a fundamental record of the biosphere on early Earth. For over 50 y, the high organic content of Archean (>2.5 Ga) mudrocks has puzzled geologists and evolutionary biologists, because high biological primary productivity was unexpected for the nascent biosphere before the rise of O.
View Article and Find Full Text PDFC photosynthesis and hydraulics in grasses.
New Phytol
January 2025
Department of Biology, University of Pennsylvania, Philadelphia, PA, 19104, USA.
The anatomical reorganization required for C photosynthesis should also impact plant hydraulics. Most C plants possess large bundle sheath cells and high vein density, which should also lead to higher leaf capacitance and hydraulic conductance (K). Paradoxically, the C pathway reduces water demand and increases water use efficiency, creating a potential mismatch between supply capacity and demand in C plant water relations.
View Article and Find Full Text PDFPrimary healthcare's carbon footprint and sustainable strategies to mitigate its contribution: a scoping review.
BMC Health Serv Res
December 2024
School of Pharmacy & Biomolecular Sciences, University of Medicine and Health Sciences, Royal College of Surgeons in Ireland, Dublin 2, Ireland.
Background: The escalating climate crisis poses a significant threat to global public health. The healthcare sector, designed to protect human health is a major contributor to greenhouse gas emissions, and thus, a key driver of climate degradation. This paradox endangers both planetary and human health, making the decarbonization of healthcare, including primary care, critical.
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