558 Hits in 1.8 sec

Conservación de Murciélagos en Campeche

Jorge A. Vargas-Contreras, Griselda Escalona-Segura, Joaquín Arroyo-Cabrales, Jaime Rendon Von Osten, Laura Navarro
2012 Therya  
Además, con la grabación de la salida de los quirópteros se hizo una estimación de la población que va entre 80,000 a 100,000 murciélagos (Escalona-Segura et al. 2002) o casi de 1 a 2.3 millones de murciélagos  ... 
doi:10.12933/therya-12-56 fatcat:kal32chphrf7pdbh74nuuhbkfm

Entrainment, Arnold tongues, and duality in a periodically driven integrate-and-fire model

Joaquı́n Escalona, Jorge V. José, Paul Tiesinga
2002 Neurocomputing  
We have studied an integrate-and-ÿre model neuron driven by a periodic sequence of Gaussianshaped current pulses of width 1=2N and amplitude . For large N the current is a sequence of delta pulses and for smaller N it approaches a sine. When N is large, the ÿring rate f vs. curve is a staircase of entrainment steps yielding an Arnold tongue structure in the vs. plane. In the small N limit we ÿnd novel entrainment steps in the f vs. plane, without Arnold tongue structure. The steps in the two N
more » ... egimes are related by a duality transformation. In the presence of noise in the pulse arrival times, the steps disappear above a critical noise value.
doi:10.1016/s0925-2312(02)00366-1 fatcat:mcykx3x675g75agnwvnmprtmei

Learning necessities of primary care doctors on coronary reperfusion in the acute myocardial infarction

Raúl Joaquín Varela García, Ángel Luis Olivera Escalona, Omara Margarita Guarton Ortiz, Irma Dariannis Varela García
2019 Medisan  
the knowledge on coronary reperfusion in the acute myocardial infarction with elevation of the ST segment in the primary care level is of extraordinary importance to decrease complications and mortality. Objective: to determine the necessities of doctors from primary care on coronary reperfusion in the acute myocardial infarction. Method: a descriptive study of 65 physicians who worked in 5 main polyclinics for emergencies of Santiago de Cuba was carried out in November, 2017 for which a survey
more » ... with variables of interest was applied which was qualified according to evaluation methodology and previously established standard by the working team. Results: of all questions, only one (5.9 %) fulfilled the standard of more than 70 % of doctors with appropriate responses; the years of experience and receiving a previous training influenced positively in the number of these responses. The lack of training was the cause for which the treatment was not applied, and its planning, as well as the creation of working algorithms were the measures mostly proposed by the physicians. None of them referred to be correctly trained. Conclusions: doctors who worked in the 5 main emergency polyclinics showed learning necessities and training on the management for coronary reperfusion.
doaj:5d35dc85952e4ff690d3788fa2a54336 fatcat:7dinvgnhxzc2fnpdekwr5sw7va

Cuantificación de la supresión basada en contraste: una técnica cromática para la presentación dicóptica

Ing. Yenner Joaquín Díaz Núñez, Ing. Frank Fernández Escalona, Yanet Cristina Díaz Núñez
2015 Revista Cubana de Informática Médica  
Las pruebas clínicas para evaluar la supresión están diseñadas generalmente para comprobar solamente su presencia. En este trabajo se evalúa la fiabilidad de la cuantificación de la supresión basada en contraste. Se utilizó una tarea dicóptica de discriminación de movimiento global con kinematogramas de puntos aleatorios, una técnica de codificación cromática basada en la división del espectro visible, para la construcción de la presentación dicóptica, y la variante de cuantificación que
more » ... de una etapa binocular y otra dicóptica. Para determinar el desempeño se utilizó el método de la escalera. A pesar de las limitaciones del experimento, los resultados apoyan la teoría sobre la relevancia del desequilibrio de contraste intraocular en el proceso de la supresión, corroboran la fiabilidad de la cuantificación de la supresión basada en contraste y validan la viabilidad de la técnica cromática dicóptica.
doaj:5c5195a1d3f0477ca015fbce5bc44bb6 fatcat:s353nzu3j5ejno2o5pzafql67u

Self-dual non-Abelian vortices in a Φ2 Chern-Simons theory

Armando Antillón, Joaquín Escalona, Gabriel Germán, Manuel Torres
1995 Physics Letters B  
We study a non-Abelian Chern-Simons gauge theory in 2+ 1 dimensions with the inclusion of an anomalous magnetic interaction. For a particular relation between the Chern-Simons (CS) mass and the anomalous magnetic coupling the equations for the gauge fields reduce from second- to first order differential equations of the pure CS type. We derive the Bogomol'nyi-type or self-dual equations for a ^2 scalar potential, when the scalar and topological masses are equal. The corresponding vortex
more » ... s carry magnetic flux that is not quantized due to the non-toplogical nature of the solitons. However, as a consequence of the quantization of the CS term, both the electric charge and angular momentum are quantized.
doi:10.1016/0370-2693(95)01077-4 fatcat:yuniv7mt5nc6fp5iwbx6oo3l4y

Genomic Variation and Evolution of Vibrio parahaemolyticus ST36 over the Course of a Transcontinental Epidemic Expansion

Jaime Martinez-Urtaza, Ronny van Aerle, Michel Abanto, Julie Haendiges, Robert A. Myers, Joaquin Trinanes, Craig Baker-Austin, Narjol Gonzalez-Escalona, Mary Ann Moran
2017 mBio  
Vibrio parahaemolyticus is the leading cause of seafood-related infections with illnesses undergoing a geographic expansion. In this process of expansion, the most fundamental change has been the transition from infections caused by local strains to the surge of pandemic clonal types. Pandemic clone sequence type 3 (ST3) was the only example of transcontinental spreading until 2012, when ST36 was detected outside the region where it is endemic in the U.S. Pacific Northwest causing infections
more » ... ng the U.S. northeast coast and Spain. Here, we used genome-wide analyses to reconstruct the evolutionary history of the V. parahaemolyticus ST36 clone over the course of its geographic expansion during the previous 25 years. The origin of this lineage was estimated to be in ~1985. By 1995, a new variant emerged in the region and quickly replaced the old clone, which has not been detected since 2000. The new Pacific Northwest (PNW) lineage was responsible for the first cases associated with this clone outside the Pacific Northwest region. After several introductions into the northeast coast, the new PNW clone differentiated into a highly dynamic group that continues to cause illness on the northeast coast of the United States. Surprisingly, the strains detected in Europe in 2012 diverged from this ancestral group around 2000 and have conserved genetic features present only in the old PNW lineage. Recombination was identified as the major driver of diversification, with some preliminary observations suggesting a trend toward a more specialized lifestyle, which may represent a critical element in the expansion of epidemics under scenarios of coastal warming. IMPORTANCE Vibrio parahaemolyticus and Vibrio cholerae represent the only two instances of pandemic expansions of human pathogens originating in the marine environment. However, while the current pandemic of V. cholerae emerged more than 50 years ago, the global expansion of V. parahaemolyticus is a recent phenomenon. These modern expansions provide an exceptional opportunity to study the evolutionary process of these pathogens at first hand and gain an understanding of the mechanisms shaping the epidemic dynamics of these diseases, in particular, the emergence, dispersal, and successful introduction in new regions facilitating global spreading of infections. In this study, we used genomic analysis to examine the evolutionary divergence that has occurred over the course of the most recent transcontinental expansion of a pathogenic Vibrio , the spreading of the V. parahaemolyticus sequence type 36 clone from the region where it is endemic on the Pacific coast of North America to the east coast of the United States and finally to the west coast of Europe.
doi:10.1128/mbio.01425-17 pmid:29138301 pmcid:PMC5686534 fatcat:m4r6pihrefhbxbkgee25yq62ny

Vortices and domain walls in a Chern-Simons theory with magnetic moment interactions

Armando Antillón, Joaquín Escalona, Manuel Torres
1997 Physical Review D, Particles and fields  
We study the structure and properties of vortices in a recently proposed Abelian Maxwell-Chern-Simons model in 2 +1 dimensions. The model which is described by gauge field interacting with a complex scalar field, includes two parity and time violating terms: the Chern-Simons and the anomalous magnetic terms. Self-dual relativistic vortices are discussed in detail. We also find one dimensional soliton solutions of the domain wall type. The vortices are correctly described by the domain wall solutions in the large flux limit.
doi:10.1103/physrevd.55.6327 fatcat:j2c7nmjzl5a3zpwyfpodkgenx4

Epidemic Dynamics of Vibrio parahaemolyticus Illness in a Hotspot of Disease Emergence, Galicia, Spain

Jaime Martinez-Urtaza, Joaquin Trinanes, Michel Abanto, Antonio Lozano-Leon, Jose Llovo-Taboada, Marta Garcia-Campello, Anxela Pousa, Andy Powell, Craig Baker-Austin, Narjol Gonzalez-Escalona
2018 Emerging Infectious Diseases  
doi:10.3201/eid2405.171700 pmid:29664388 pmcid:PMC5938774 fatcat:gbfusdqd4jhqfeffld74elsrhi

Intraoperative stress and anxiety reduction with music therapy: A controlled randomized clinical trial of efficacy and safety

Maria Jiménez-Jiménez, Alma García-Escalona, Alejandra Martín-López, Raquel De Vera-Vera, Joaquin De Haro
2013 Journal of Vascular Nursing  
Objective: The purpose of this study was to investigate the music therapy (MT) effect in levels of intraoperative anxiety in patients undergoing crossectomy with stripping of the great saphenous vein and to assess the efficacy, safety, and feasibility of this alternative therapy as a complement of standard intraoperative care. Material and methods: The study is a simple blind, controlled, parallel groups, prospective randomized clinical trial. Patients were allocated by means of randomized
more » ... olled sampling. The study was performed in the surgery room of Getafe University Hospital in Madrid. The study was carried out in 40 patients, 20 randomized to the experimental group and 20 randomized to the control group, with an age range from 27 to 70 years. The control group was given intraoperative routine attention, and the experimental group was given an MT passive intervention that consisted of audition of musical fragments during varicose veins surgery. These pieces previously showed relaxing actions on the cardiovascular system. The anxiety levels were measured by means of pre-and postsurgical questionnaires by a blinded investigator for the study arm to which the patients had been randomized. Heart rate and systolic and diastolic blood pressures were determined during the intervention, and adrenaline and noradrenaline plasma levels were determined before and after the surgical procedure. Results: The majority of the patients in the MT group (95%) and standard care group (90%) completed the study. There were no statistical differences between the control and experimental groups in heart rate gradient or systolic and diastolic blood pressures measured after the intervention. The anxiety state and the stress feeling scale score after surgery were significantly inferior in the MT group (94.7% vs 57.9% decrease in anxiety levels, P < .05, and stress score of 1.31 vs 2.36, P < .05, respectively). The adverse events ratio was low and occurred with similar frequency in both groups. Conclusions: The MT intervention was easily implemented in the context of nursing care received during varicose vein surgery and was positively accepted and valued by the majority of the patients. MT is a safe procedure that is proved to reduce anxiety and stress in the study patients. (J Vasc Nurs 2013;31:101-106)
doi:10.1016/j.jvn.2012.10.002 pmid:23953858 fatcat:xko4erhtdneuhmyvknftxs6ssy

The Influence of EEG References on the Analysis of Spatio-Temporal Interrelation Patterns

Wady A. Ríos-Herrera, Paola V. Olguín-Rodríguez, J. Daniel Arzate-Mena, Maria Corsi-Cabrera, Joaquín Escalona, Arlex Marín-García, Julieta Ramos-Loyo, Ana Leonor Rivera, Daniel Rivera-López, José F. Zapata-Berruecos, Markus F. Müller
2019 Frontiers in Neuroscience  
The characterization of the functional network of the brain dynamics has become a prominent tool to illuminate novel aspects of brain functioning. Due to its excellent time resolution, such research is oftentimes based on electroencephalographic recordings (EEG). However, a particular EEG-reference might cause crucial distortions of the spatiotemporal interrelation pattern and may induce spurious correlations as well as diminish genuine interrelations originally present in the dataset. Here we
more » ... nvestigate in which manner correlation patterns are affected by a chosen EEG reference. To this end we evaluate the influence of 7 popular reference schemes on artificial recordings derived from well controlled numerical test frameworks. In this respect we are not only interested in the deformation of spatial interrelations, but we test additionally in which way the time evolution of the functional network, estimated via some bi-variate interrelation measures, gets distorted. It turns out that the median reference as well as the global average show the best performance in most situations considered in the present study. However, if a collective brain dynamics is present, where most of the signals get correlated, these schemes may also cause crucial deformations of the functional network, such that the parallel use of different reference schemes seems advisable.
doi:10.3389/fnins.2019.00941 pmid:31572110 pmcid:PMC6751257 fatcat:e72xppbfq5a5zngqodkpqfhn54

Page 497 of National Union Catalog Vol. 6, Issue [page]

1948 National Union Catalog  
D805.G3E7 52-29461 Escalera, Francisco Montero see Montero Escalera, Escalera, Joaquin Mier y Vigil- see Mier y Vigil-Escalera, Joaquin. Escallier, Emile. Le chapelet de Notre-Dame.  ...  F1219.1, QSE7 50-57365 Escalona Ramos, Alberto see Spengler, Oswald, 1880-1936. La historia El ocaso de Alberto de Occident gia con breves Escalona Ramos México, 1950.  ... 

Page 413 of Current World Leaders Vol. 35, Issue 3 [page]

1992 Current World Leaders  
.: Ramén DARIAS Rodés Academy of Sciences: Roas Elena SIMEON Negrin Cabinet: Joaquin BENAVIDES Rodriguez, José A.  ...  People’s Assembly: Juan ESCALONA Reguera : Head of the Cuban Interests Section in the US: José Antonio ARBESU Fraga Perm.  ... 

Page 789 of Current World Leaders Vol. 35, Issue 5 [page]

1992 Current World Leaders  
.: Ramén DARIAS Rodés Academy of Sciences: Roas Elena SIMEON Negrin Cabinet: Joaquin BENAVIDES Rodriguez, José A.  ...  People’s Assembly: Juan ESCALONA Reguera Head of the Cuban Interests Section in the US: José Antonio ARBESU Fraga Perm.  ... 

Page 625 of Current World Leaders Vol. 33, Issue 5 [page]

1990 Current World Leaders  
Bank: Hector RODRIGUEZ Llompart State Normalization Com.: Ramé6n DARIAS Rodés Academy of Sciences: Roas Elena SIMEON Negrin Cabinet: Joaquin BENAVIDES Rodriguez, José A.  ...  Abelardo COLOME Ibarra Domestic Trade: Manuel VILA Sosa Justice: Juan ESCALONA Reguera State Labor and Social Security Com.: Francisco LINARES Calvo Light Industries: Antonio ESQUIVEL Yedra Basic Industry  ... 

Page 679 of Current World Leaders Vol. 34, Issue 5 [page]

1991 Current World Leaders  
.: Ramén DARIAS Rodés Academy of Sciences: Roas Elena SIMEON Negrin Cabinet: Joaquin BENAVIDES Rodriguez, José A.  ...  People's Assembly: Juan ESCALONA Reguera Head of the Cuban Interests Section in the US: José Antonio ARBESU Fraga Perm.  ... 
« Previous Showing results 1 — 15 out of 558 results