... doi.org/10.1007/s00265-019-2737-1Gonzalo Marcelo Ramírez-Ávila, Jürgen Kurths, Stéphanie Depickère, Jean-Louis Deneubourg ...
Tópico(s): Plant and animal studies
1938 - University of Chicago Press | The Quarterly Review of Biology
Nicolás Rubido, Cécilia Cabeza, Arturo C. Martı́, Gonzalo Marcelo Ramírez-Ávila,
Recently, a new kind of optically coupled oscillators that behave as relaxation oscillators has been studied experimentally in the case of local coupling. Even though numerical results exist, there are no references about experimental studies concerning the synchronization times with local coupling. In this paper, we study both experimentally and numerically a system of coupled oscillators in different configurations, including local coupling. Synchronization times are quantified as a function of ...
Tópico(s): Quantum optics and atomic interactions
2009 - Royal Society | Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering Sciences
Roberto Romero, Rogelio González, Waldo Sepúlveda, Francisco Brandt, Marcelo Ramírez, Yoram Sorokin, Moshe Mazor, Marjorie C. Treadwell, David B. Cotton,
OBJECTIVE: The purpose of this study was to determine the prevalence and clinical significance of microbial invasion of the amniotic cavity in patients presenting with cervical dilatation in the midtrimester of pregnancy. STUDY DESIGN: Amniocentesis for microbial studies was performed in women admitted with cervical dilatation ≥2 cm, intact membranes, and without active labor between 14 and 24 weeks of gestation. Amniotic fluid was cultured for aerobic and anaerobic bacteria, as well as for mycoplasmas. ...
Tópico(s): Urological Disorders and Treatments
1992 - Elsevier BV | American Journal of Obstetrics and Gynecology
Gonzalo Marcelo Ramírez-Ávila, Jean‐Luc Guisset, J. L. Deneubourg,
Tópico(s): Photoreceptor and optogenetics research
2003 - Elsevier BV | Physica D Nonlinear Phenomena
Paul L. Fidel, Roberto Romero, Marcelo Ramírez, Jessica Cutright, S. Edwin, S. LaMarche, David B. Cotton, Murray D. Mitchell,
PROBLEM: This study was conducted to determine whether (1) conditioned media from unstimulated primary cultures of human amnion, chorion, or decidua contain detectable concentrations of IL‐lra in vitro, and (2) bacterial endotoxin (LPS), tumor necrosis factor‐alpha (TNF‐α), or IL‐1‐beta (IL‐1β) stimulate amnion, chorion, or decidua to produce increased amounts of IL‐1ra. METHOD: Placentae were obtained from women at term with intact membranes before the onset of labor. Amnion, chorion, and decidual cells ...
Tópico(s): Neonatal Respiratory Health Research
1994 - Wiley | American Journal of Reproductive Immunology
Paul L. Fidel, Roberto Romero, Norbert A. Wolf, Jessica Cutright, Marcelo Ramírez, Heriberto Araneda, David B. Cotton,
Tópico(s): Infant Nutrition and Health
1994 - Elsevier BV | American Journal of Obstetrics and Gynecology
Paul L. Fidel, Roberto Romero, Norbert A. Wolf, Jessica Cutright, Marcelo Ramírez, Heriberto Araneda, David B. Cotton,
OBJECTIVE: Our purpose was to determine whether endotoxin-induced preterm parturition is preceded by a change in the maternal serum and arnniotic fluid concentrations of tumor necrosis factor-α, interleukin-6, and interleukin-1α. STUDY DESIGN: C3H/HeN pregnant mice at 15 days of gestation (70% gestation) were randomized to receive an intraperitoneal injection of phosphate-buffered saline solution or lipopolysaccharide (50 μg/mouse). Blood (n = 93) and amniotic fluid (n = 58) were collected at 1,4, and 10 ...
Tópico(s): Reproductive System and Pregnancy
1994 - Elsevier BV | American Journal of Obstetrics and Gynecology
Produção Nacional
Revisado por pares
Gonzalo Marcelo Ramírez-Ávila, Jason A. C. Gallas,
This Letter reports phase diagrams quantifying and contrasting the dynamical performance of the paradigmatic piecewise-linear and cubic circuits of Chua. Although both circuits may be regarded as macroscopically isomorphic over wide regions in control parameter space, we show that their microscopic structure displays a myriad of rather distinctive intrinsic features making them unique. Inhomogeneities embedded in periodic and chaotic phases complicate some applications of the circuits but may also ...
Tópico(s): Nonlinear Dynamics and Pattern Formation
2010 - Elsevier BV | Physics Letters A
Gonzalo Marcelo Ramírez-Ávila, J. L. Deneubourg, Jean‐Luc Guisset, Niels Wessel, Jürgen Kurths,
Response to synchronization seems to be a widespread phenomenon specially in biological systems. We highlight this phenomenon studying the courtship of flashing fireflies in which a typical collective rhythm occurring only among the males arises and it is followed by a response of the females. Based on a model issued from electronic fireflies, we explain the synchronization of the males and the active responses of the females in the courtship of mingled (both sexes) populations of fireflies. The ...
Tópico(s): Plant and animal studies
2011 - Institute of Physics | EPL (Europhysics Letters)
Produção Nacional
Revisado por pares
Hernaldo Carrasco B., Óscar Olivares Gómez, Martín Del Río Arteaga, Gabriel Sayes Patiño, Mauricio Aguilar Veloso, Felipe Solar Tobar, Sebastián Veloso Daettwyler, Alexi Ponce Rivadeneira, Mirtha Nuñez González, Alex Silva Guzmán, Irma Valenzuela Gangas, Elisa Ansoleaga M., Juan Pablo Toro C., Antonio Stecher G., Lorena Godoy C., José María Blanch B., Francisco Rodón Aranda, Marcela Arellano Calzadillas, Iván Mendoza González, Andrea Villalobos Restovic, Juan Carlos Zurita Rojas, Verónica Iglesias Álamos, Marcia Erazo, Andrea Droppelmann Igor, Paulina Aceituno Risueño, Cecilia Orellana Pozo, Ana Navas Acien, Rodrigo Cornejo Chávez, Lorena Muñoz, Adrián Fuente Contreras, Macarena Bowen Moreno, Guido Clemente Solari Montenegro, Antonio Bruno Solari Vega, Eduardo Angle Olivares, Alejandra Roa Barriga, Omayda Cárdenas Bustamante, Elizabeth Silva Espina, Jaime Eduardo Ortiz Varón, Gerardo Nava Tovar, Silvia Mendocilla Silvia, Darío Concha, Henry Sánchez Barreto, Rodrigo Finkelstein, Fabiola Salas G., María Luz Bascuñán Rodríguez, Nina Horwitz Campos, Julia Acuña Rojas, Juan Pablo Jiménez de la Jara, Irene Schiattino Lemus, Nelly Gómez Fuentealba, María Angélica Mardones Hernández, Jacqueline Araneda Flores, Víctor Córdoba Pavez, Rodrigo Pinto Retamal, Jessica Castillo Cuadros, Marcelo Ramírez, Guillermo Farmer Aldunce, Gonzalo Munilla Monsalve, Ana María Brito Bugueño, María Teresa Muñoz-Quezada,
Actividad física y su relación con los factores de riesgo cardiovascular de carteros chilenosAnálisis de resultados: riesgos psicosociales en el trabajo Suceso-Istas 21 en Cesfam QuellónAusentismo laboral por enfermedades oftalmológicas, Chile 2009Brote de diarreas por norovirus, posterremoto-tsunami, Constitución, Región del MauleCalidad de vida en profesionales de la salud pública chilenaCaracterización del reposo laboral en personal del SSMN durante el primer semestre de 2010Concentración de ...
Tópico(s): Stress and Burnout Research
2012 - | Revista Chilena de Salud Pública
Roberto Romero, Bo Hyun Yoon, Moshe Mazor, Ricardo Gómez, Michael P. Diamond, John S. Kenney, Marcelo Ramírez, Paul L. Fidel, Yoram Sorokin, David B. Cotton, Pravinkumar B. Sehgal,
Objective: Our goal was to compare the value of amniotic fluid tests in the detection of microbial invasion of the amniotic cavity and in the relationship with the amniocentesis-to-delivery interval and neonatal complications in patients with preterm labor and intact membranes. Study Design: Amniotic fluid was retrieved by transabdominal amniocentesis from 120 patients with preterm labor and intact membranes. Fluid was cultured for aerobic and anaerobic bacteria and for mycoplasmas. Amniotic fluid ...
Tópico(s): Neonatal and Maternal Infections
1993 - Elsevier BV | American Journal of Obstetrics and Gynecology
Mingjun Sun, Marcelo Ramírez, J. R. G. Challis, William Gibb,
The human fetal membranes and decidua may be important in the onset and/or progression of human labor by providing prostaglandins for this process. Glucocorticoids have been implicated in the regulation of prostaglandin production by these tissues but to date there is no direct evidence for glucocorticoid receptors (GRs) being present in human intrauterine tissues. The purpose of the present study was to determine, using immunohistochemistry, whether the human fetal membranes and decidua contained ...
Tópico(s): Infant Nutrition and Health
1996 - Bioscientifica | Journal of Endocrinology
D. Camargo, Cecilia Saad, Fernando Ruiz, Marcelo Ramírez, M. Lineros, Gerzaín Rodríguez, Eduardo Molina Navarro, Beatriz García Pulido, Luís Carlos Orozco,
Summary We describe an outbreak of skin lesions due to Mycobacterium chelonae subsp. abscessus associated with injections of lidocaine (lignocaine) given by a ‘bioenergetic’ (a practitioner of alternative medicine) in Colombia. The lidocaine carpules and the lesions of the patients yielded mycobacteria with identical biochemical characteristics. Using the methodology of Sartwell and a case control design we examined the incubation period and assessed risk factors. Of 667 potentially exposed individuals, ...
Tópico(s): Infectious Diseases and Mycology
1996 - Cambridge University Press | Epidemiology and Infection
Gonzalo Marcelo Ramírez-Ávila, A. Gapelyuk, Norbert Marwan, Holger Stepan, Jürgen Kurths, T Walther, Niels Wessel,
It is urgently aimed in prenatal medicine to identify pregnancies, which develop life-threatening preeclampsia prior to the manifestation of the disease. Here, we use recurrence-based methods to distinguish such pregnancies already in the second trimester, using the following cardiovascular time series: the variability of heart rate and systolic and diastolic blood pressures. We perform recurrence quantification analysis (RQA), in addition to a novel approach, ε-recurrence networks, applied to a ...
Tópico(s): Neural dynamics and brain function
2013 - Elsevier BV | Autonomic Neuroscience
Gonzalo Marcelo Ramírez-Ávila, A. Gapelyuk, Norbert Marwan, Thomas Walther, Holger Stepan, Jürgen Kurths, Niels Wessel,
We analyse cardiovascular time series with the aim of performing early prediction of preeclampsia (PE), a pregnancy-specific disorder causing maternal and foetal morbidity and mortality. The analysis is made using a novel approach, namely the ε-recurrence networks applied to a phase space constructed by means of the time series of the variabilities of the heart rate and the blood pressure (systolic and diastolic). All the possible coupling structures among these variables are considered for the analysis. ...
Tópico(s): Chaos control and synchronization
2013 - Royal Society | Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering Sciences
Paul L. Fidel, Roberto Romero, Jessic Cutright, Norbert A. Wolf, Ricardo Gómez, Heriberto Araneda, Marcelo Ramírez, Bo Hyun Yoon,
Tópico(s): Infant Nutrition and Health
1997 - SAGE Publishing | Journal of the Society for Gynecologic Investigation
Gonzalo Marcelo Ramírez-Ávila, Jürgen Kurths, Stéphanie Depickère, Jean‐Louis Deneubourg,
Albeit synchronous behavior of some fireflies species is one of the paradigmatic examples of synchronization, there are not many efforts to model in a realistic way this astounding phenomenon. One of the most important features of fireflies synchronization is the cooperative behavior of many fireflies giving rise to the emergency of synchronization without any leader, a fact that took a long time to be recognized. In this chapter, we review the main attempts to build models allowing the explanation ...
Tópico(s): Plant and animal studies
2018 - Springer International Publishing | Nonlinear systems and complexity
Martín González, Juan L. Navarro-Mesa, Gabriel Juliá-Serdà, Gonzalo Marcelo Ramírez-Ávila, Antonio G. Ravelo‐García,
Our contribution focuses on the characterization of sleep apnea from a cardiac rate point of view, using Recurrence Quantification Analysis (RQA), based on a Heart Rate Variability (HRV) feature selection process. Three parameters are crucial in RQA: those related to the embedding process (dimension and delay) and the threshold distance. There are no overall accepted parameters for the study of HRV using RQA in sleep apnea. We focus on finding an overall acceptable combination, sweeping a range of ...
Tópico(s): EEG and Brain-Computer Interfaces
2018 - Public Library of Science | PLoS ONE
Geovana Martín-Alemañy, Ángeles Espinosa-Cuevas, L. M. Perez-Navarro, Kenneth R. Wilund, Paola Miranda-Alatriste, Mario Cortés-Pérez, Gloria García-Villalobos, Irma Gómez-Guerrero, Guillermo Cantú-Quintanilla, Marcelo Ramírez-Mendoza, Rafael Valdez-Ortiz,
Objective Protein energy wasting affects the nutritional status (NS) and physical function (PF) of dialysis patients. Among the different anabolic strategies to improve NS and PF, oral nutritional supplementation (ONS) and resistance exercise (RE) or aerobic exercise (AE) have been shown to be effective. Nevertheless, the combination of both anabolic strategies has not been completely evaluated. The aim of this study is to assess the effect of exercise combined with ONS versus ONS without exercise during hemodialysis ...
Tópico(s): Iron Metabolism and Disorders
2019 - Elsevier BV | Journal of Renal Nutrition
Stéphanie Depickère, Gonzalo Marcelo Ramírez-Ávila, Jean‐Louis Deneubourg,
Abstract Triatominae insects are vectors of the parasite Trypanosoma cruzi , the etiological agent of Chagas disease affecting millions of people in Latin America. Some species, such as Triatoma infestans , live in the human neighborhood, aggregating in walls or roof cracks during the day and going out to feed blood at night. The comprehension of how sex and T. cruzi infection affect their aggregation and geotaxis is essential for understanding their spatial organization and the parasite dispersion. ...
Tópico(s): Insect-Plant Interactions and Control
2019 - Nature Portfolio | Scientific Reports
Nicolás Rubido, Cécilia Cabeza, Sandra Kahan, Gonzalo Marcelo Ramírez-Ávila, Arturo C. Martı́,
Tópico(s): Slime Mold and Myxomycetes Research
2010 - Springer Science+Business Media | The European Physical Journal D
Produção Nacional
Revisado por pares
Paul Schultz, Thomas Peron, Deniz Eroglu, Thomas Stemler, Gonzalo Marcelo Ramírez-Ávila, Francisco A. Rodrigues, Jürgen Kurths,
Natural and man-made networks often possess locally treelike substructures. Taking such tree networks as our starting point, we show how the addition of links changes the synchronization properties of the network. We focus on two different methods of link addition. The first method adds single links that create cycles of a well-defined length. Following a topological approach, we introduce cycles of varying length and analyze how this feature, as well as the position in the network, alters the synchronous ...
Tópico(s): Slime Mold and Myxomycetes Research
2016 - American Physical Society | Physical review. E
Produção Nacional
Revisado por pares
Gonzalo Marcelo Ramírez-Ávila, Jürgen Kurths, Jason A. C. Gallas,
We report the discovery of two types of stability rings in the control parameter space of a vertical-cavity surface-emitting semiconductor laser. Stability rings are closed parameter paths in the laser control space. Inside such rings, laser stability thrives even in the presence of small parameter fluctuations. Stability rings were also found in rather distinct contexts, namely, in the way that cancerous, normal, and effector cells interact under ionizing radiation and in oscillations of an electronic ...
Tópico(s): Slime Mold and Myxomycetes Research
2021 - American Institute of Physics | Chaos An Interdisciplinary Journal of Nonlinear Science
Gonzalo Marcelo Ramírez-Ávila, Stéphanie Depickère, Imre M. Jánosi, Jason A. C. Gallas,
Abstract Large-scale brain simulations require the investigation of large networks of realistic neuron models, usually represented by sets of differential equations. Here we report a detailed fine-scale study of the dynamical response over extended parameter ranges of a computationally inexpensive model, the two-dimensional Rulkov map, which reproduces well the spiking and spiking-bursting activity of real biological neurons. In addition, we provide evidence of the existence of nested arithmetic ...
Tópico(s): Nonlinear Dynamics and Pattern Formation
2022 - Springer Science+Business Media | The European Physical Journal Special Topics
Josephine Bratz, Marcelo Sandoval-Ramírez,
ABSTRACT Objective: To present an analysis of the nursing ethos based on the disciplinary foundations of nursing to propose a definition of ethical competences for nursing training. Method: The present proposal is a theoretical reflection, based on a literature review of the specialty, both nursing and ethics. Results: we suggest basing the ethical education of nursing students integrating transversally disciplinary, bioethical and civic ethical competences, considering certain educational dimensions ...
Tópico(s): Palliative and Oncologic Care
2018 - Associação Brasileira de Enfermagem | Revista Brasileira de Enfermagem
Luz Boyero, Alonso Ramírez, David Dudgeon, Richard G. Pearson,
... 759–769.https://doi.org/10.1086/681093Alonso Ramírez, Marcelo Ardón, Michael M. Douglas, and Manuel A. S. ... Boulton, Muthukumarasamy Arunachalam, Marcos Callisto, Eric Chauvet, Alonso Ramírez, Julián Chará, Marcelo S Moretti, José F Gonçalves, Julie E Helson, ... N. Davies, Ricardo Figueroa, Alexander S. Flecker, Alonso Ramírez, Russell G. Death, Tomoya Iwata, Jude M. Mathooko, Catherine Mathuriau, José F. Gonçalves, Marcelo S. Moretti, Tajang Jinggut, Sylvain Lamothe, Charles M' ...
Tópico(s): Freshwater macroinvertebrate diversity and ecology
2009 - University of Chicago Press | Journal of the North American Benthological Society
Alonso Ramírez, Marcelo Ardón, Michael M. Douglas, Manuel A. S. Graça,
... freshwater sciences: an overview of ongoing tropical researchAlonso Ramírez, Marcelo Ardón, Michael M. Douglas, and Manuel A. S. ...
Tópico(s): Fish Ecology and Management Studies
2015 - University of Chicago Press | Freshwater Science
María Elena Nilo, JULIAN ALVARADO, Marcelo Ramírez, Eduardo Espejo,
Chagas disease is an important endemic disease in Latinamerica. The transmitions mechanism of Trypanosoma cruzi, etiologic agent of Chagas disease are multiples, this comunication is refering to congenital infection or transplacental infection. The aim of the present report was to describe the finding of trypomastigote in citochemical study of amniotic fluid from pregnant women with 32 weeks of gestation. Clinical findings of trypomastigote in amniotic fluid, shows the importance of microscopics ...
Tópico(s): Breastfeeding Practices and Influences
2000 - SciELO | Parasitología al día
Gonzalo Marcelo Ramírez-Ávila, Jürgen Kurths, J. L. Deneubourg,
Synchronous flashing in Fireflies is perhaps the first observed natural phenomenon displaying synchronization of a large ensemble. During a long time, this collective behavior was not recognized and validated as synchronous, but nowadays it constitutes a paradigmatic example of synchronization. In this chapter, we explain biological aspects related to fireflies flashing and their functionality. The response to synchronization observed in some firefly species is illustrated utilizing a model based ...
Tópico(s): Slime Mold and Myxomycetes Research
2017 - Springer Nature | Understanding complex systems
Fernanda C. Moraes, Laura Marcelo Forero Ramirez, Rachida Aid, Samira Benadda, Murielle Maire, Cédric Chauvierre, Joana C. Antunes, Frédéric Chaubet, Didier Letourneur,
Nanogels were prepared in aqueous media without the use of any organic solvent via a simple polyelectrolyte complexation method between aminated pullulan and fucoidan followed by covalent crosslinking with genipin. Homogeneously distributed genipin crosslinked nanogels (G-PECs) were obtained with a mean hydrodynamic diameter of ~155 nm and zeta potential of 0.86 ± 4.35 mV. Their capacity to bind to human activated platelets was evaluated in vitro, as well as their cytocompatibility within human endothelial ...
Tópico(s): MicroRNA in disease regulation
2021 - Elsevier BV | International Journal of Pharmaceutics