42 results for "Mario Ramirez"

Aurelio Blanquet: una semblanza necesaria

Héctor Díaz Zermeño; Mario Ramirez Rancaño

Revista Vectores de Investigación, Vol. 4 No. 4 · 2012 · French · DOAJ

En la historia oficial, la mayoría de los militares que integraron el extinto ejército federal han sido sumamente satanizados. Se les trata como seres apestados sobre los cales no vale la pena ocuparse. Alguien ha dicho que sus actos alcanzaron tal perversidad que sólo merecen e infierno. En un…

Delayed Fluoroquinolone-Induced Tibialis Anterior Rupture: Review and Case Report on Achilles and Tibialis Anterior Atraumatic Rupture with Operative Technique

Matthew Prevost; Edward Szabo; Mario Ramirez et al.

Case Reports in Orthopedic Research, Vol. 5 No. 1 · 2022 · English · DOAJ

Tendinopathy is a well-defined adverse effect of fluoroquinolone (FQ) antibiotics with complete tendon rupture being the most serious consequence. The most described FQ-associated tendinopathies are of the Achilles tendon with an onset ranging between 2 h after initial FQ administration to 6 months…

chewBBACA 3: lowering the barrier for scalable and detailed whole- and core-genome multilocus sequence typing

Rafael Mamede; Pedro Vila-Cerqueira; João André Carriço et al.

Genome Medicine, Vol. 18 No. 1 · 2026 · English · DOAJ Scopus

Abstract Background The wide adoption of whole genome sequencing has enabled the implementation of genomics-based systems, which provide unparalleled resolution for the surveillance and outbreak investigation of bacterial pathogens. To fully exploit the wealth and complexity of genomics data…

Corporate Governance and Dividend Policy: Evidence from Colombia

Samuel Mongrut Montalvan; Carlos Mario Ramirez Arango; Julian Usma Patiño

Revista Mexicana de Economía y Finanzas Nueva Época REMEF, Vol. 18 No. 4 · 2023 · Spanish · DOAJ Scopus

We study the impact of the adoption of the corporate governance code denominated Country Code (CC), on the dividend payout ratio of non-financial firms that report to the Superintendency of Companies in Colombia. Using an unbalanced panel data model with a sample of 605 companies from 1997 until…

Robotics Education in STEM Units: Breaking Down Barriers in Rural Multigrade Schools

Angela Castro; Jhonny Medina; Cristhian A. Aguilera et al.

Sensors, Vol. 23 No. 1 · 2022 · English · DOAJ Scopus

We report a novel proposal for reducing the digital divide in rural multigrade schools, incorporating knowledge of robotics with a STEM approach to simultaneously promote curricular learning in mathematics and science in several school grades. We used an exploratory qualitative methodology to…

Epidemiology and risk factors for mortality among methicillin-resistant Staphylococcus aureus bacteremic patients in Southern Brazil

Cezar Vinícius Würdig Riche; Renato Cassol; Diego Rodrigues Falci et al.

PLOS ONE, Vol. 18 No. 4 · 2023 · English · PLOS Scopus

This study aimed to evaluate the epidemiology and 30-day mortality of adult patients with methicillin-resistant Staphylococcus aureus (MRSA) bacteremia. We retrospectively reviewed the demographic and clinical data of adult patients with S. aureus bloodstream infections (BSI), admitted to a…

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State Observer for Time Delay Systems Applied to SIRS Compartmental Epidemiological Model for COVID-19

Raúl Villafuerte-Segura; Jorge A. Hernández-Ávila; Gilberto Ochoa-Ortega et al.

Mathematics, Vol. 12 No. 24 · 2024 · English · DOAJ Scopus

This manuscript presents a Luenberger-type state observer for a class of nonlinear systems with multiple delays. Sufficient conditions are provided to ensure practical stability of the error dynamics. The exponential decay of the observation error dynamics is guaranteed through the use of…

Displacement and Velocity Estimation in Building Structures Using an Algebraic Observer

Jesus Morales-Valdez; Jesus D. Aviles; Mario Ramirez-Neria et al.

IEEE Access, Vol. 12 · 2024 · English · DOAJ Scopus

This study addresses the problem of estimating the velocity and displacement of building structures. Initially, the dynamics of a building subject to seismic disturbance are represented using the Euler-Bernoulli beam model. Subsequently, the model is discretized into a finite number of floors…

Active Disturbance Rejection Control for Reference Trajectory Tracking Tasks in the Pendubot System

Mario Ramirez-Neria; Hebertt Sira-Ramirez; Ruben Garrido-Moctezuma et al.

IEEE Access, Vol. 9 · 2021 · English · DOAJ Scopus

In this article, an Extended State Observer (ESO) based Active Disturbance Rejection Control (ADRC) scheme is applied to the Pendubot system for a trajectory tracking tasks. The tangent linearization of the system allows to implement the control scheme taking advantage of the differential flatness…

iDS372, a Phenotypically Reconciled Model for the Metabolism of Streptococcus pneumoniae Strain R6

Oscar Dias; João Saraiva; Cristiana Faria et al.

Frontiers in Microbiology, Vol. 10 · 2019 · English · DOAJ Scopus

A high-quality GSM model for Streptococcus pneumoniae R6 model strain (iDS372), comprising 372 genes and 529 reactions, was developed. The construction of this model involved performing a genome-wide reannotation to identify the metabolic capacity of the bacterium. A reaction representing the…

Emergence of the Same Successful Clade among Distinct Populations of emm89 Streptococcus pyogenes in Multiple Geographic Regions

Ana Friães; Miguel P. Machado; Catarina Pato et al.

mBio, Vol. 6 No. 6 · 2015 · English · DOAJ Scopus

Serotype 3 remains the leading cause of invasive pneumococcal disease in adults in Portugal (2012-2014) despite continued reductions in other 13-valent conjugate vaccine serotypes.

Andreia N Horácio; Catarina Silva-Costa; Joana P Lopes et al.

Frontiers in Microbiology, Vol. 7 · 2016 · English · DOAJ Scopus

Since 2010 the 13-valent pneumococcal conjugate vaccine (PCV13) replaced the 7-valent vaccine (PCV7) as the leading pneumococcal vaccine used in children through the private sector. Although neither of the PCVs were used significantly in adults, changes in adult invasive pneumococcal disease (IPD)…

CC180 clade dynamics do not universally explain Streptococcus pneumoniae serotype 3 persistence post-vaccine: a global comparative population genomics studyResearch in context

Sydney Stanley; Catarina Silva-Costa; Joana Gomes-Silva et al.

EBioMedicine, Vol. 117 · 2025 · English · DOAJ Scopus

Summary: Background: Clonal complex 180 (CC180) is currently the major clone of serotype 3 Streptococcus pneumoniae (Spn) causing disease among children and adults worldwide. The 13-valent pneumococcal conjugate vaccine (PCV13) does not have significant efficacy against serotype 3 despite…

EPIDEMIOLOGIA E FATORES DE RISCO PARA MORTALIDADE EM BACTEREMIAS OCASIONADAS POR MRSA DE PORTO ALEGRE, RS

Cezar Vinícius Würdig Riche; Rafael Mamede; Renato Cassol et al.

Brazilian Journal of Infectious Diseases, Vol. 26 · 2022 · English · DOAJ Scopus

Introdução/Objetivo: A epidemiologia das infecções por Staphylococcus aureus resistente a meticilina (MRSA) é dinâmica, havendo aumento na prevalência de MRSA ocasionando infecções adquiridas na comunidade (CA) ou relacionadas à assistência à saúde (IRAS). O objetivo deste estudo foi avaliar a…

A Comparative Analysis of Metaheuristic Algorithms for Enhanced Parameter Estimation on Inverted Pendulum System Dynamics

Daniel Sanin-Villa; Miguel Angel Rodriguez-Cabal; Luis Fernando Grisales-Noreña et al.

Mathematics, Vol. 12 No. 11 · 2024 · English · DOAJ Scopus

This research explores the application of metaheuristic algorithms to refine parameter estimation in dynamic systems, with a focus on the inverted pendulum model. Three optimization techniques, Particle Swarm Optimization (PSO), Continuous Genetic Algorithm (CGA), and Salp Swarm Algorithm (SSA)…

Induction of Prophages by Fluoroquinolones in Streptococcus pneumoniae : Implications for Emergence of Resistance in Genetically-Related Clones

Elena López; Arnau Domenech; María-José Ferrándiz et al.

PLoS ONE, Vol. 9 No. 4 · 2014 · English · PLOS Scopus

Antibiotic resistance in Streptococcus pneumoniae has increased worldwide by the spread of a few clones. Fluoroquinolone resistance occurs mainly by alteration of their intracellular targets, the type II DNA topoisomerases, which is acquired either by point mutation or by recombination. Increase in…

Population Structure of Streptococcus pneumoniae Causing Invasive Disease in Adults in Portugal before PCV13 Availability for Adults: 2008-2011

Andreia N. Horácio; Catarina Silva-Costa; Jorge Diamantino-Miranda et al.

PLOS ONE, Vol. 11 No. 5 · 2016 · English · PLOS Scopus

Among the 1660 isolates recovered from invasive pneumococcal disease (IPD) in adults (> = 18 yrs) in 2008–2011, a random sample of ≥50% of each serotype (n = 871) was chosen for MLST analysis and evaluation for the presence and type of pilus islands (PIs). The genetic diversity was high with 206…

On the Robust Trajectory Tracking Task for Flexible-Joint Robotic Arm With Unmodeled Dynamics

Mario Ramirez-Neria; Gilberto Ochoa-Ortega; Norma Lozada-Castillo et al.

IEEE Access, Vol. 4 · 2016 · English · DOAJ Scopus

This paper is concerned with the design and experimental assessment of, both, feedback linearization and sliding mode control techniques to the tracking trajectory problem of a flexible-joint robotic arm for a smooth rest to rest maneuver. The robust improvement of these controllers is analyzed by…