CRIS
Permanent URI for this communityhttps://investigadores.udd.cl/handle/123456789/1
Browse
28 results
Search Results
Now showing 1 - 10 of 28
- Some of the metrics are blocked by yourconsent settings
Item type:Publication, Copper-Modified Cellulose Paper: A Comparative Study of How Antimicrobial Activity Is Affected by Particle Size and Testing Standards(MDPI AG, 2025-01-08); Viviana BenavidesThis study aims to provide evidence that when testing cellulose paper modified with copper particles (CuPs), the particle size and the analysis method influence the antimicrobial activity observed by this material. Commercial CuPs of nanometric size (2.7 nm, CuNPs) and micrometric size (2.5 µm, CuMPs) were used to modify cellulose paper sheets. CuPs were incorporated during the pulp disintegration phase (stage 1) of the sheet formation process, according to the ISO 5269-1:2005 standard. Modified paper sheets retained 16% and 14% of CuNPs and CuMPs, respectively. Additionally, CuPs were distributed randomly on the fiber surfaces, often forming aggregates. Finally, the antimicrobial activity of the modified paper sheets was evaluated using ISO 20645:2004 and ISO 20743:2013. The results showed that the antimicrobial activity assessed using each standard method is conditioned by the mechanism of action of the CuPs and, therefore, by their size. It was concluded that ISO 20645:2004 is suitable for evaluating the antibacterial effect of paper/CuNPs, as nanoparticles diffuse from the paper and are released into the culture medium. In contrast, ISO 20743:2013 can be used for both CuNP- and CuMP-based paper, as it evaluates the antibacterial effect based on the direct interaction between the copper particle and the bacteria.Scopus© Citations 2 14 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Performance of the VITEK® MS system for the identification of filamentous fungi in a microbiological laboratory in Chile(Public Library of Science (PLoS), 2024-12-23); 1 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Increased mortality in hospital- compared to community-onset carbapenem-resistant enterobacterales infections(2024)Scopus© Citations 1 3 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Editorial: Immune response to gram-negative bacteria in the lungs(2024); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Excess burden of antibiotic-resistant bloodstream infections: evidence from a multicentre retrospective cohort study in Chile, 2018–2022(2024)Scopus© Citations 2 4 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, <i>Venus antiqua</i> Clamshell-Derived Calcium Oxide Nanoparticles for the Preparation of PLA/<scp>d</scp>-Limonene/CaO Nanocomposites with Antimicrobial Properties(2023); Francesca Antonella SepúlvedaScopus© Citations 17 3 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Multiple clonal transmissions of clinically relevant extended-spectrum beta-lactamase–producing Escherichia coli among livestock, dogs, and wildlife in Chile(2023)Scopus© Citations 16 1 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Lives lost and disease burden related to antimicrobial resistance in the Americas can no longer be ignored(2023)2Scopus© Citations 4 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Head-to-head comparison of CAMPYAIR aerobic culture medium versus standard microaerophilic culture for Campylobacter isolation from clinical samples(2023); ; Isabel Briceño<jats:p><jats:italic>Campylobacter</jats:italic> spp. are considered the most frequent cause of acute gastroenteritis worldwide. However, outside high-income countries, its burden is poorly understood. Limited published data suggest that <jats:italic>Campylobacter</jats:italic> prevalence in low- and middle-income countries is high, but their reservoirs and age distribution are different. Culturing <jats:italic>Campylobacter</jats:italic> is expensive due to laboratory equipment and supplies needed to grow the bacterium (e.g., selective culture media, microaerophilic atmosphere, and a 42°C incubator). These requirements limit the diagnostic capacity of clinical laboratories in many resource-poor regions, leading to significant underdiagnosis and underreporting of isolation of the pathogen. CAMPYAIR, a newly developed selective differential medium, permits <jats:italic>Campylobacter</jats:italic> isolation without the need for microaerophilic incubation. The medium is supplemented with antibiotics to allow <jats:italic>Campylobacter</jats:italic> isolation in complex matrices such as human feces. The present study aims to evaluate the ability of the medium to recover <jats:italic>Campylobacter</jats:italic> from routine clinical samples. A total of 191 human stool samples were used to compare the ability of CAMPYAIR (aerobic incubation) and a commercial <jats:italic>Campylobacter</jats:italic> medium (CASA, microaerophilic incubation) to recover <jats:italic>Campylobacter</jats:italic>. All <jats:italic>Campylobacter</jats:italic> isolates were then identified by MALDI-TOF MS. CAMPYAIR showed sensitivity and specificity values of 87.5% (95% CI 47.4%–99.7%) and 100% (95% CI 98%–100%), respectively. The positive predictive value of CAMPYAIR was 100% and its negative predictive value was 99.5% (95% CI 96.7%–99.9%); Kappa Cohen coefficient was 0.93 (95% CI 0.79–1.0). The high diagnostic performance and low technical requirements of the CAMPYAIR medium could permit <jats:italic>Campylobacter</jats:italic> culture in countries with limited resources.</jats:p>Scopus© Citations 3 1 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Chromosome-Mediated Colistin Resistance in Clinical Isolates of Klebsiella pneumoniae and Escherichia coli: Mutation Analysis in the Light of Genetic Background(2023); Scopus© Citations 4 2
- «
- 1 (current)
- 2
- 3
- »