Norberto Martínez‐Méndez, Omar Mejía, Fausto R. Méndez de la Cruz,
According to the cold-climate hypothesis, viviparity in reptiles evolved in cold environments to allow females to maintain adequate temperatures for their embryos. We were interested in understanding the past climate conditions that allowed the secondary invasion of viviparous species in lowlands and whether global warming will affect lowland and highland populations in the same way. Thus, we investigated Sceloporus serrifer, a viviparous lizard that inhabits the highlands of Chiapas and Guatemala ...
Tópico(s): Wildlife Ecology and Conservation
2015 - Elsevier BV | Zoologischer Anzeiger
Norberto Martínez‐Méndez, Omar Mejía, Jorge Ortega, Fausto R. Méndez‐de la Cruz,
The cold-climate hypothesis maintains that viviparity arose as a means to prevent increased egg mortality in nests owing to low temperatures, and this hypothesis represents the primary and most strongly supported explanation for the evolution of viviparity in reptiles. In this regard, certain authors have stated that viviparous species will exhibit speciation via climatic niche conservatism, with similar climatic niches being observed in allopatric sister species. However, this prediction remains ...
Tópico(s): Genetic diversity and population structure
2019 - PeerJ, Inc. | PeerJ
J. Linares‐Flores, José Antonio Juárez-Abad, Arturo Hernández‐Méndez, Omar Castro-Heredia, J. Fermi Guerrero‐Castellanos, Rubén Heredia-Barba, Gonzalo Curiel‐Olivares,
This article presents a new control strategy merging a sliding mode control (SMC) with a linear extended state observer (LESO) to regulate the output voltage of the buck–boost power converter system affected by matched and mismatched disturbances. The SMC–LESO schema uses the input–output linearization approach and the equivalent control method to determine the boundary layer around the sliding surface. This boundary layer depends on the sliding surface and the equivalent control value, depending ...
Tópico(s): Multilevel Inverters and Converters
2021 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Industry Applications
Juana Isabel Méndez, Omar Mata, Pedro Ponce, Alan Meier, Therese Peffer, Arturo Molina,
Over the years, the elderly people population will become more than children population; besides since 2018 people over 65 years old outnumbered the population under 5 years old. Growing up involves biological, physical, social and psychological changes that may lead to social isolation and loss of loved ones, or even to the sense of loss of value, purpose or confidence. Moreover, as people are aging, they usually spend more time at home. As a solution, social inclusion through mobile devices and ...
Tópico(s): IoT and Edge/Fog Computing
2020 - Springer International Publishing | Studies in systems, decision and control
María Eugenia de Porras, Antonio Maldonado, Ana M. Abarzúa, Macarena L. Cárdenas, Jean Pierre Francois, Alejandra Martel‐Cea, Charles R. Stern, César Méndez, Omar Reyes,
A 19 cal ka BP pollen and charcoal record from Lake Shaman (44°S; 71°W, Chile) was analyzed to establish vegetation, fire and climate dynamics of the forest-steppe ecotone in Central Chilean Patagonia. Lake Shaman record indicates that the upper Río Cisnes valley was free of ice at around 19 cal ka BP. From this date and until 14.8 cal ka BP, a grass steppe with high proportions of shrubs associated to colder and drier conditions than present developed in this area. A continuous increase of Nothofagus ...
Tópico(s): Archaeology and ancient environmental studies
2012 - Elsevier BV | Quaternary Science Reviews
David Méndez, Omar Alshanqeety, Kenneth E. Warner,
The flavonoids quercetin and kaempferol are major constituents of Ginkgo biloba extract. The ATP-binding cassette efflux transporter, breast cancer resistance protein (Bcrp, Abcg2), is involved in the transport of quercetin and represents a possible mechanism for the low bioavailability of quercetin. Our objective was to investigate whether kaempferol inhibits Bcrp-mediated quercetin efflux and determine whether it is a substrate for BCRP. The intracellular uptake of kaempferol, with and without ...
Tópico(s): Obesity, Physical Activity, Diet
2012 - BMJ | Tobacco Control
David Méndez, Omar Alshanqeety, Kenneth E. Warner, Paula M. Lantz, Paul N. Courant,
We examined the effect of current patterns of smoking rates on future radon-related lung cancer.We combined the model developed by the National Academy of Science's Committee on Health Risks of Exposure to Radon (the BEIR VI committee) for radon risk assessment with a forecasting model of US adult smoking prevalence to estimate proportional decline in radon-related deaths during the present century with and without mitigation of high-radon houses.By 2025, the reduction in radon mortality from smoking ...
Tópico(s): Radioactive contamination and transfer
2011 - American Public Health Association | American Journal of Public Health
César Méndez, Omar Reyes, A Delaunay, VALENTINA TREJO, Ramiro Barberena, HÉCTOR VELÁSQUEZ M,
Se presenta una síntesis de las investigaciones llevadas a cabo en el sitio El Chueco 1 (CIS 042).La localidad arqueológica corresponde a un punto de gran significancia para entender las dinámicas de poblamiento en una zona de ocupación marginal de Patagonia Central.La extensión temporal (11.500 a 2.570 años cal.AP.) y superposición de eventos discretos de ocupación hacen que el contexto excavado represente un buen medidor de los pulsos humanos regionales y su magnitud.En este trabajo se define la ...
Tópico(s): Forensic Anthropology and Bioarchaeology Studies
2011 - University of Magallanes | Magallania
How early did steppe dwellers penetrate the forests? The authors compare and contrast settlement on the steppe, in the forest and on the steep sea coast of western Patagonia, finding that the steppe is occupied first, from 11400 calendar years BP. But around 2800 calendar years BP settlements enter the forest almost simultaneously for a brief period along the length of the Cisnes river valley. Within a few centuries the experiment appears to be abandoned, and the focus of prehistoric peoples returns ...
Tópico(s): Archaeology and ancient environmental studies
2008 - Cambridge University Press | Antiquity
Cecília Díaz, Ernesto Vargas-Méndez, Omar Gätjens-Boniche,
Two retinoids, ATRA and 13cisRA, were incorporated into liposomes of different composition and charge and added to two hepatoma cell lines with different degree of transformation to measure cytotoxicity by MTT assay. Retinoid-free cationic liposomes were more toxic than the other kinds (anionic and made only of PC) but were also the best delivery system for retinoic acid to induce specific cytotoxic effects on these tumor hepatoma cell lines. Galactosyl-sphingosine containing cationic liposomes increased ...
Tópico(s): Systemic Lupus Erythematosus Research
2006 - Elsevier BV | International Journal of Pharmaceutics
Eduardo Méndez, Omar Lugo, Patricia Melín,
Tópico(s): Stock Market Forecasting Methods
2016 - Springer Nature | Studies in computational intelligence
Kenneth E. Warner, David Méndez, Omar Alshanqeety,
We examined the effect of demographics on California's low smoking prevalence. We estimated that if the United States had the same demographics as California, then the US adult smoking prevalence in 2005 would have been 19.3%, 1.6 percentage points lower than the reported 20.9% for the United States, but 4.1 percentage points higher than California's prevalence of 15.2% in 2005. Tobacco control appears to be a much more important factor than demographics in determining California's low smoking rates.
Tópico(s): Smoking Behavior and Cessation
2008 - American Public Health Association | American Journal of Public Health
César Méndez, Omar Reyes, A Delaunay, Héctor Velásquez, Valentina Trejo, Natalie Hormazábal, Marcelo Solari, Charles R. Stern,
Hunter-gatherer occupations of the forests of Patagonia are still not well understood compared to those of the open steppe and the coasts. The paucity of forest sites with a thorough chronological framework and the incomplete picture of climate-human dynamics in such environments pose a challenge to understanding the occupations of such habitats. This paper presents recent work at the Las Quemas rockshelter, an archaeological site located in the Andean forests of the Aisén region (44°38’ S) dating ...
Tópico(s): Pacific and Southeast Asian Studies
2016 - Cambridge University Press | Latin American Antiquity
José Jairo Soriano Méndez, Omar Lorenzo González Melo, Franck Vladimir Munar Fontecha, Andrés Augusto Ramos Acosta,
This paper introduces to a new method in the design of fuzzy controllers, looking for as main objective to simplify or to reduce the complexity of the traditional deffuzzifiers without changes on theirs effectiveness, the used way for such an end is to begin of the Boole's logic to arrive to a fuzzy control surface.
Tópico(s): Fuzzy Logic and Control Systems
2001 - University of Costa Rica | Ingeniería
Produção Nacional
Revisado por pares
Karen Andrea Méndez-Camacho, Omar Daniel León-Alvarado, Daniel Rafael Miranda‐Esquivel,
The Amazon has high biodiversity, which has been attributed to different geological events such as the formation of rivers. The Old and Young Amazon hypotheses have been proposed regarding the date of the formation of the Amazon basin. Different studies of historical biogeography support the Young Amazon model, however, most studies use secondary calibrations or are performed at the population level, preventing evaluation of a possible older formation of the Amazon basin. Here, we evaluated the ...
Tópico(s): Genomics and Phylogenetic Studies
2021 - PeerJ, Inc. | PeerJ
Stephanie Gamez, Igor Antoshechkin, Stelia C. Méndez‐Sánchez, Omar S. Akbari,
Abstract Aedes albopictus mosquitoes are important vectors for a number of human pathogens including the Zika, dengue, and chikungunya viruses. Capable of displacing Aedes aegypti populations, this mosquito adapts to cooler environments which increases its geographical range and transmission potential. There are limited control strategies for Aedes albopictus mosquitoes which is likely attributed to the lack of comprehensive biological studies on this emerging vector. To fill this void, here using ...
Tópico(s): Malaria Research and Control
2020 - Genetics Society of America | G3 Genes Genomes Genetics
Shea M. Lambert, Jeffrey W. Streicher, M. Caitlin Fisher‐Reid, Fausto R. Méndez de la Cruz, Norberto Martínez‐Méndez, Uri Omar García‐Vázquez, Adrián Nieto‐Montes de, John J. Wiens,
Introgression is now commonly reported in studies across the Tree of Life, aided by recent advancements in data collection and analysis. Nevertheless, researchers working with nonmodel species lacking reference genomes may be stymied by a mismatch between available resources and methodological demands. In this study, we demonstrate a fast and simple approach for inferring introgression using RADseq data, and apply it to a case study involving spiny lizards (Sceloporus) from northeastern México. First, ...
Tópico(s): Plant and animal studies
2018 - Wiley | Molecular Ecology Resources
Alexander Rodríguez‐López, Edgar Arenas, Alba L. Osorio, Omar Mendez, John Jairo Zuleta Tobón,
ObjectiveThe purpose of this study was to determine whether selective midline episiotomy contributes to the prevention of third- or fourth-degree perineal lacerations.Study DesignA randomized controlled clinical trial was performed with 446 nulliparous women with deliveries after 28 weeks of pregnancy. Patients were randomized to undergo either routine episiotomy or selective episiotomy. In the selective episiotomy group, episiotomies were performed only in cases of imminent lacerations, fetal distress, ...
Tópico(s): Anorectal Disease Treatments and Outcomes
2008 - Elsevier BV | American Journal of Obstetrics and Gynecology
Carolina Belmar, César Méndez, Omar Reyes,
Tópico(s): Pacific and Southeast Asian Studies
2017 - Springer Science+Business Media | Vegetation History and Archaeobotany
This article refers to the characterization of Las Quemas site lithic assemblage (Cisnes river valley, Aisén region, 44o S) and its first radiocarbon date.This site is a cave with rock art, located in the forest-steppe transition and was first excavated in 1996 by Francisco Mena.
Tópico(s): Indigenous Cultures and History
2006 - University of Magallanes | Magallania
May Portuguez Castro, Rogelio Vicente Hernández-Méndez, Luis Omar Peña-Ortega,
This study describes a funding initiative that promotes educational innovation in a higher education institution in Mexico. This initiative, known as Novus, and carried out at Tecnologico de Monterrey, encourages professors to present educational innovation proposals by funding and monitoring research projects that promote student learning and competencies. These projects are based on digital technologies and pedagogies developed on the 26 campuses distributed throughout the country. This article ...
Tópico(s): Digital literacy in education
2022 - Multidisciplinary Digital Publishing Institute | Education Sciences
A Delaunay, César Méndez, Omar Reyes, Andrea Seelenfreund, Carolina Belmar,
Las principales vías de circulación en Patagonia, localizadas al este de esta región, generaron que los valles occidentales fueran marginalmente ocupados, posiblemente visitados de forma estacional y complementaria y, por tanto, habitados con menor inten- sidad. La idea de la ocupación de los "corredores sin salida de los Andes" de Luis Borrero conforma la plataforma teórica para el estudio de los valles occidentales de Patagonia. En particular, el área circunscrita por los lagos General Carrera ...
Tópico(s): Evolution and Paleontology Studies
2022 - University of Tarapacá | Chungara
José Ramos‐Méndez, Omar R Garcia-Garcia, Jorge Domínguez‐kondo, Jay A. LaVerne, Jan Schuemann, E. Moreno, Bruce Faddegon,
Abstract Current Monte Carlo simulations of DNA damage have been reported only at ambient temperature. The aim of this work is to use TOPAS-nBio to simulate the yields of DNA single-strand breaks (SSBs) and double-strand breaks (DSBs) produced in plasmids under low-LET irradiation incorporating the effect of the temperature changes in the environment. A new feature was implemented in TOPAS-nBio to incorporate reaction rates used in the simulation of the chemical stage of water radiolysis as a function ...
Tópico(s): Graphite, nuclear technology, radiation studies
2022 - IOP Publishing | Physics in Medicine and Biology
Héctor Velásquez, César Méndez, Omar Reyes, Valentina Trejo, Lorena Sanhueza, Daniel Quiróz, Donald Jackson,
Se expone el estado de las investigaciones realizadas en un contexto a cielo abierto en el segmento alto del valle del río Cisnes.Appeleg 1 corresponde a un asentamiento superficial multicomponente con una significativa diversidad de materiales que, en su mayoría, se ubica temporalmente dentro de los últimos 1.500 años.Se presenta el contexto del sitio, la metodología de recuperación
Tópico(s): Medieval Architecture and Archaeology
2007 - University of Magallanes | Magallania
Víctor Hugo Marín-Cruz, David Cibrián-Tovar, José Tulio Méndez-Montiel, Omar Alejandro Pérez-Vera, José Artemio Cadena-Meneses, Herón Huerta, Gabriel A. Rodríguez-Yam, Juan Antonio Cruz-Rodríguez,
Se estudiaron dos especies de mosquito fungoso negro, Lycoriella (Lycoriella) ingenua (Dufour, 1839) y Bradysia impatiens (Johannsen, 1912) (Diptera: Sciaridae), que causan daño a plántulas de Pinus montezumae (Lamb, 1832) en viveros forestales. Estos dípteros se identificaron morfológicamente y por métodos moleculares y se citan por primera vez como plaga en viveros forestales de México. La proporción sexual para L. ingenua fue de un macho por cada 1.25 hembras; para caracterizar esta especie se midieron ...
Tópico(s): Insect symbiosis and bacterial influences
2015 - | Madera y Bosques
Omar Mata, Juana Isabel Méndez, Pedro Ponce, Therese Peffer, Alan Meier, Arturo Molina,
A smart city is a city that binds together technology, society, and government to enable the existence of a smart economy, smart mobility, smart environment, smart living, smart people, and smart governance in order to reduce the environmental impact of cities and improve life quality. The first step to achieve a fully connected smart city is to start with smaller modules such as smart homes and smart buildings with energy management systems. Buildings are responsible for a third of the total energy ...
Tópico(s): Video Surveillance and Tracking Methods
2023 - Multidisciplinary Digital Publishing Institute | Energies
María José Mendoza-León, Ashutosh K. Mangalam, Alejandro Regaldiz, Enrique González-Madrid, Ma. Andreina Rangel-Ramírez, Oscar Álvarez-Mardonez, Omar P. Vallejos, Constanza Méndez, Susan M. Bueno, Felipe Melo-González, Yorley Duarte, María Cecilia Opazo, Alexis M. Kalergis, Claudia A. Riedel,
Thyroid disorders are clinically characterized by alterations of L-3,5,3’,5’-tetraiodothyronine (T 4 ), L-3,5,3’-triiodothyronine (T 3 ), and/or thyroid-stimulating hormone (TSH) levels in the blood. The most frequent thyroid disorders are hypothyroidism, hyperthyroidism, and hypothyroxinemia. These conditions affect cell differentiation, function, and metabolism. It has been reported that 40% of the world’s population suffers from some type of thyroid disorder and that several factors increase susceptibility ...
Tópico(s): Gut microbiota and health
2023 - Frontiers Media | Frontiers in Endocrinology
Omar E. Mendez, Carlos E. Astete, Rafael Cueto, Brian D. Eitzer, Eban A. Hanna, Fallon Salinas, Carlos Tamez, Yi Wang, Jason C. White, Cristina M. Sabliov,
Nanoscale delivery systems have the potential to improve the effectiveness of agrochemicals while reducing their negative environmental impacts. Herein, we explore the use of lignin nanoparticles (LNPs) to enhance the translocation of methoxyfenozide (MFZ), a non-systemic pesticide, in soybean plants under hydroponic conditions. LNPs (113.8 ± 3.5 nm and zeta potential – 53.3 ± 6.9 mV) were synthesized by emulsion evaporation from lignin-graft-poly(lactic-co-glycolic) acid and MFZ was incorporated into the ...
Tópico(s): Pesticide Exposure and Toxicity
2021 - Elsevier BV | Journal of Agriculture and Food Research
César Méndez, A Delaunay, Omar Reyes, Ivana L. Ozán, Carolina Belmar, Patricio López,
This article discusses new data on the initial peopling of Central Western Patagonia based on research conducted at the Cueva de la Vieja site (45°16′27″ S; 71°32′24″ W, 718 masl), contextualizing this event it in the broader Pleistocene human dispersal of southernmost South America. Archaeological excavations and analyses at this cave site were undertaken to address the chronology of the initial settlement of the region, characteristics of the first human presence and subsequent site redundancy. ...
Tópico(s): Archaeology and ancient environmental studies
2017 - Elsevier BV | Quaternary International
César Méndez, Ramiro Barberena, Omar Reyes, A Delaunay,
ABSTRACT This work aims to build a comprehensive isotopic ecology with the ultimate purpose of assessing long‐term human diet decision‐making by means of stable isotope analysis. We present a set of δ 13 C collagen and δ 15 N collagen isotopic values on the main faunal resources from the forest and steppe areas of the Aisén region (Central‐Western Patagonia, Chile), in order to characterise their isotopic ranges and assess their consumption by past hunter–gatherer populations. Two sets of bioarchaeological ...
Tópico(s): Pleistocene-Era Hominins and Archaeology
2013 - Wiley | International Journal of Osteoarchaeology