Publications by authors named "S E Ulloa"
Salmonella is a zoonotic pathogen transmitted through food and one of the four leading global causes of diarrheal disease in humans. Brazil is the world's largest exporter of poultry meat, and as such, Brazilian farms routinely detect and prevent Salmonella. The last official monitoring and control in poultry slaughter establishments in Brazil in 2023 detected Salmonella spp.
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- The study examines the effects of anisotropy on a system of three qubits using the antiferromagnetic Heisenberg XXX model in a magnetic field, focusing on Stirling and Otto cycles.
- Results show that easy-axis anisotropy boosts engine efficiency, with the ring topology outperforming the chain at low temperatures in the Stirling cycle.
- The Stirling cycle achieves Carnot efficiency with useful work at quantum critical points, while the quasistatic Otto cycle reaches Carnot efficiency but doesn't produce useful work, and the Stirling cycle operates across various thermal regimes compared to the Otto cycle.
Genomic surveillance (GS) programmes were crucial in identifying and quantifying the mutating patterns of SARS-CoV-2 during the COVID-19 pandemic. In this work, we develop a Bayesian framework to quantify the relative transmissibility of different variants tailored for regions with limited GS. We use it to study the relative transmissibility of SARS-CoV-2 variants in Chile.
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- Recent studies focus on the zonula occludens toxin (Zot) from a non-toxigenic strain PMC53.7, which affects the actin cytoskeleton in Caco-2 cells and is identified as a virulence factor.
- Universal primers were developed to examine the presence of Zot in 390 environmental isolates from Chile and Italy, along with 95 clinical isolates, highlighting its link to other virulence factors like hemolysins.
- Findings showed significant prevalence of Zot in Chilean environmental strains (37.2%) compared to Italian strains (25.9%) and clinical isolates (24.2%), indicating potential risks for infections linked to bivalve consumption.
Rare-earth complexes are vital for separation chemistry and useful in many advanced applications including emission and energy upconversion. Here, 2D rare-earth clusters having net charges are formed on a metal surface, enabling investigations of their structural and electronic properties on a one-cluster-at-a-time basis using scanning tunneling microscopy. While these ionic complexes are highly mobile on the surface at ≈100 K, their mobility is greatly reduced at 5 K and reveals stable and self-limiting clusters.
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