Publications by authors named "A E Hornby"
Exposure to ambient particulate matter (PM) with an aerodynamic diameter of <10 μm (PM) is a well-established health hazard. There is increasing evidence that geogenic (Earth-derived) particles can induce adverse biological effects upon inhalation, though there is high variability in particle bioreactivity that is associated with particle source and physicochemical properties. In this study, we investigated physicochemical properties and biological reactivity of volcanic ash from the April 2021 eruption of La Soufrière volcano, St.
View Article and Find Full Text PDFObjective: De Quervain's tenosynovitis causes pain and impairment of thumb function. Conservative treatments comprise corticosteroid injection and immobilization, and it is unclear which offers greater efficacy. Previous reviews were limited by the small number of included studies; thus an updated review and meta-analysis is warranted.
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- Explosive volcanic eruptions release large amounts of silicate ash, which undergoes surface changes while traveling through the atmosphere, affecting its interactions with the environment, including ice formation and toxicity to organisms.
- Previous studies have not accurately characterized the original ash surface due to the assumption that the surfaces formed during fragmentation mirror the bulk composition of the ash particles.
- Our research on andesite ash particles reveals significant differences in surface chemistry caused by the way fractures form in the magma, emphasizing the importance of these pre-eruptive features in influencing how ash behaves and interacts in various environmental contexts.
Volcanic ash emissions impact atmospheric processes, depositional ecosystems, human health, and global climate. These effects are sensitive to the size and composition of the ash; however, datasets describing the constituent phases over size ranges relevant for atmospheric transport and widely distributed impacts are practically nonexistent. Here, we present results of X-ray diffraction measurements on size-separated fractions of 40 ash samples from VEI 2-6 eruptions.
View Article and Find Full Text PDFVolcanic ash particle properties depend upon their genetic fragmentation processes. Here, we introduce QEMSCAN Particle Mineralogical Analysis (PMA) to quantify the phase distribution in ash samples collected during activity at Santiaguito, Guatemala and assess the fragmentation mechanisms. Volcanic ash from a vulcanian explosion and from a pyroclastic density current resulting from a dome collapse were selected.
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