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Search Results: 1 - 10 of 7226 matches for " Vanessa Suarez-Contreras "
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Effects of Sensory Behavioral Tasks on Pain Threshold and Cortical Excitability
Magdalena Sarah Volz, Vanessa Suarez-Contreras, Mariana E. Mendonca, Fernando Santos Pinheiro, Lotfi B. Merabet, Felipe Fregni
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0052968
Abstract: Background/Objective Transcutaneous electrical stimulation has been proven to modulate nervous system activity, leading to changes in pain perception, via the peripheral sensory system, in a bottom up approach. We tested whether different sensory behavioral tasks induce significant effects in pain processing and whether these changes correlate with cortical plasticity. Methodology/Principal Findings This randomized parallel designed experiment included forty healthy right-handed males. Three different somatosensory tasks, including learning tasks with and without visual feedback and simple somatosensory input, were tested on pressure pain threshold and motor cortex excitability using transcranial magnetic stimulation (TMS). Sensory tasks induced hand-specific pain modulation effects. They increased pain thresholds of the left hand (which was the target to the sensory tasks) and decreased them in the right hand. TMS showed that somatosensory input decreased cortical excitability, as indexed by reduced MEP amplitudes and increased SICI. Although somatosensory tasks similarly altered pain thresholds and cortical excitability, there was no significant correlation between these variables and only the visual feedback task showed significant somatosensory learning. Conclusions/Significance Lack of correlation between cortical excitability and pain thresholds and lack of differential effects across tasks, but significant changes in pain thresholds suggest that analgesic effects of somatosensory tasks are not primarily associated with motor cortical neural mechanisms, thus, suggesting that subcortical neural circuits and/or spinal cord are involved with the observed effects. Identifying the neural mechanisms of somatosensory stimulation on pain may open novel possibilities for combining different targeted therapies for pain control.
Developing Multicultural Awareness in Preschool Children: A Pilot Intervention  [PDF]
Samantha Bellini, Vanessa Pereda, Nicole Cordero, Lourdes Suarez-Morales
Open Journal of Social Sciences (JSS) , 2016, DOI: 10.4236/jss.2016.47028
Abstract: The increasing diversity of the U.S. population presents a need to address developing stereotypes. Racial and ethnic attitudes and biases can develop at young ages. The current study examined a pilot classroom intervention, which exposed preschool children to different cultures and considered the intervention’s influence on racial attitudes. Sixteen preschool students in two classrooms were randomly assigned to the experimental condition, multicultural themed lessons, or the control condition, animal themed lessons. Attitudes about children of various ethnicities were assessed before and after the intervention. Variables considered included same group bias and outgroup bias. The results indicated that children who received the multicultural intervention changed favorably their attitudes towards children of other ethnicities compared to children who did not receive the experimental intervention. This study demonstrates that attitudes and biases towards others may be influenced through early education and increased awareness.
Uso de los Antagonistas Beta-Adrenérgicos en la Hipertensión Arterial
Velasco,M; Romero,B; Betancourt,M; Suarez,N; Contreras,F;
Archivos Venezolanos de Farmacología y Terapéutica , 2002,
Abstract: beta-blockers are drugs designed to competitively inhibit beta-receptors and thus to modulate activity of the sympathetic nervous system. the beta-blockers are normally distinguished based on their selectivity for beta-receptors. the nonselective beta-blockers, including propanolol, pindolol, nadolol, timolol and labetalol each antagonize both beta-1 and beta-2 adrenergic receptors. the selective antagonists including metoprolol, atenolol, esmolol and acebutolol, each has much greater binding affinity for the beta-1 adrenergic receptor. the selective beta-blockers are normally indicated for patients in whom beta-2 receptor antagonism might be associated with an increased risk of adverse effects. such patients include those with asthma or diabetes, or patients with peripheral vascular disease or raynauda??s disease. some beta-blockers have partial agonist (intrinsic sympathomimetic) activity. beta-blockers, as monotherapy or combined with others drugs, have proven effective in reducing the symptoms of angina pectoris and in reducing morbidity and mortality after myocardial infarction. therefore, are the drugs of choice in patients with elevated blood pressure and myocardial infarction or angina. many are commonly used in the treatment of patients with frequent recurrent migraine, hypertrophic obstructive cardiomyopathy, acute anxiety, and glaucoma. this article present a detailed review on beta-blockers in the treatment of hypertension.
Forma de aplicación y efectividad de la Permetrina 1 %, utilizada por convivientes con escolares, para el control de la pediculosis capitis en los ni os Ways of application and effectiveness of 1 % permethrin used by schoolchildren relatives for the control of pediculosis capitis
Yalina Chang Camero,Natividad Hernández Contreras,María I. Chao Sautié,Yarina Santana Suarez
Revista Cubana de Medicina Tropical , 2008,
Abstract: Introducción: entre los problemas que inciden en los fallos, de los tratamientos pediculicidas, están la forma de aplicación y la baja efectividad de los productos utilizados. Objetivos: conocer, por medio de encuestas de opiniones, la forma de aplicación y la efectividad de la Permetrina 1 % fabricada en Cuba para el control de los piojos. Métodos: los cuestionarios se distribuyeron entre los convivientes con escolares de primaria, que con anterioridad habían utilizado el producto en los ni os. El trabajo se realizó de mayo a julio de 2007 en escuelas urbanas y rural-urbanas de las provincias Ciudad de La Habana, Sancti Spíritus y Las Tunas, en Cuba. Resultados: de 786 convivientes encuestados, 637 (81,17 %) no aplicaron el pediculicida según las indicaciones formuladas en el prospecto, que se adjunta al frasco, 579 (73,66 %) la consideran ineficaz y solo 143 (16,32 %) la han utilizado como único tratamiento. Conclusiones: no existe sincronización en los pasos seguidos durante el tratamiento. Se evidencia una alta heterogeneidad en las respuestas, porque más de 70 % de los encuestados la consideran ineficaz para el tratamiento de la pediculosis capitis. Background: Among the problems that influence on failure of pediculosis treatment is the way of application and low effectiveness of used products. Objectives: to find out, through surveys, the ways of application and the effectiveness of 1 % permethrin manufactured in Cuba for the control of pediculosis capitis. Methods: the questionnaires were distributed among people living with elementary schoolchildren, who had previously applied the products to children. The study was performed from May to July 2007 in urban and rural-urban schools located in City of Havana, Sancti Spiritus and Las Tunas provinces in Cuba. Results: Seven hundred and eighty six people were surveyed, 637 of them (81,17 %) did not follow the instructions given in the flask in applying the anti-pediculosis products, 579 (73,66 %) considered it as ineffective and only 143 (16,32 %) had used it as unique treatment. Conclusions: there is not any agreement in steps followed by these people during treatment. Responses were very heterogeneous because over 70 % of surveyed persons stated that permethrin was ineffective for treatment of pediculosis capitis
Forma de aplicación y efectividad de la Permetrina 1 %, utilizada por convivientes con escolares, para el control de la pediculosis capitis en los ni?os
Chang Camero,Yalina; Hernández Contreras,Natividad; Chao Sautié,María I.; Santana Suarez,Yarina; Fernández Herrera,Benigno;
Revista Cubana de Medicina Tropical , 2008,
Abstract: background: among the problems that influence on failure of pediculosis treatment is the way of application and low effectiveness of used products. objectives: to find out, through surveys, the ways of application and the effectiveness of 1 % permethrin manufactured in cuba for the control of pediculosis capitis. methods: the questionnaires were distributed among people living with elementary schoolchildren, who had previously applied the products to children. the study was performed from may to july 2007 in urban and rural-urban schools located in city of havana, sancti spiritus and las tunas provinces in cuba. results: seven hundred and eighty six people were surveyed, 637 of them (81,17 %) did not follow the instructions given in the flask in applying the anti-pediculosis products, 579 (73,66 %) considered it as ineffective and only 143 (16,32 %) had used it as unique treatment. conclusions: there is not any agreement in steps followed by these people during treatment. responses were very heterogeneous because over 70 % of surveyed persons stated that permethrin was ineffective for treatment of pediculosis capitis
An Alternative View to the Cause of Market Failures: A Dynamic Approach  [PDF]
Salvador Contreras
Theoretical Economics Letters (TEL) , 2014, DOI: 10.4236/tel.2014.47069
Abstract:

This paper presents an alternative view to the cause and size of market failures. The work here suggest that the size of the market failure is not man made per se but rather given a full set of initial conditions it is endogenous to the dynamical forces at play. It is shown that the level and variance of market failures is tied to the location of the steady state (i.e. level of development). The paper finds that only changes to the location of the steady state produces changes to the potential level of the market failure. This paper adds to the increasing body of literature the notion that institutional change is not a sufficient condition to sustained economic development.

Energy-States of Particles with Representational Spin  [PDF]
Ricardo Suarez, Gregory G. Wood
Applied Mathematics (AM) , 2016, DOI: 10.4236/am.2016.77060
Abstract: In this paper, an algorithm to produce a transition matrix between all states in ideal anti-paramagetic system under the simulated annealing condition that only moves to lower energy states are accepted. The check the accuracy of the transition matrix is confirmed by computer simulation, showing close agreement between model and simulation results.
A Model for the Risk of Microcephaly Induced by the Zika Virus (ZIKV)  [PDF]
Dalia M. Mu?oz Pizza, Anibal Mu?oz Loaiza, John F. Arredondo Montoya, Oscar A. Manrique, Vanessa Abello Sossa, Carlos A. Abello Mu?oz, Steven Raigosa, Hans Meyer Contreras, Irma Pérez Contreras, Maria E. Cardenas Perea, Miguel A. Enríquez
Open Journal of Modelling and Simulation (OJMSi) , 2016, DOI: 10.4236/ojmsi.2016.43010
Abstract: It has been introduced and analyzed a mathematical model based on integral equations, which turns into a dynamical system of non-linear differential equations to account for the risk of microcephaly incidence caused by the Zika virus. A specific pregnant women susceptible group has been accounted for. The epidemic threshold (basic reproduction number) has been obtained by implementing the next generation matrix method. A sensitivity analysis with respect to each parameter has been applied to that threshold. Finally, the incidence to the exposure is obtained by performing several system simulations.
A Simulation Model for the Risk of Fetal Exposure Originated by the Zika Virus (VIZK)  [PDF]
Dalia M. Mu?oz Pizza, Anibal Mu?oz Loaiza, Oscar A. Manrique Arias, Vanessa Abello Sossa, Carlos A. Abello Mu?oz, Steven Raigosa Osorio, Hans Meyer Contreras, John F. Arredondo Montoya, Gonzaga Ospina Pati?o, Irma Pérez Contreras, Maria E. Cardenas Perea, Miguel A. Enríquez Guerra, Jesús A. Valdez García
Health (Health) , 2016, DOI: 10.4236/health.2016.812121
Abstract: It is set and analyzed a simulation model based on non-linear ordinary differential equations to interpret the dynamics of the microcephaly incidence caused by the Zika virus in a risk group of pregnant women. This one is induced by a population of men in a reproductive age. Also, some parameters of the model were estimated for an average temperature of 23℃ and by using the adjusted functions from references [1] [2]. All system simulations were done with the Maple software and parameters values obtained from several sources (estimated, hypothetic, and form literature). It has been found that the application of contraceptive measures impacts the population of sexually active women. As result, the exposure to congenital abnormalities increases, particularly, microcephaly.
Reducing Communication Delays and Improving Quality of Care with a Tuberculosis Laboratory Information System in Resource Poor Environments: A Cluster Randomized Controlled Trial
Joaquín A. Blaya, Sonya S. Shin, Martin Yagui, Carmen Contreras, Peter Cegielski, Gloria Yale, Carmen Suarez, Luis Asencios, Jaime Bayona, Jihoon Kim, Hamish S. F. Fraser
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0090110
Abstract: Background Lost, delayed or incorrect laboratory results are associated with delays in initiating treatment. Delays in treatment for Multi-Drug Resistant Tuberculosis (MDR-TB) can worsen patient outcomes and increase transmission. The objective of this study was to evaluate the impact of a laboratory information system in reducing delays and the time for MDR-TB patients to culture convert (stop transmitting). Methods Setting: 78 primary Health Centers (HCs) in Lima, Peru. Participants lived within the catchment area of participating HCs and had at least one MDR-TB risk factor. The study design was a cluster randomized controlled trial with baseline data. The intervention was the e-Chasqui web-based laboratory information system. Main outcome measures were: times to communicate a result; to start or change a patient's treatment; and for that patient to culture convert. Results 1671 patients were enrolled. Intervention HCs took significantly less time to receive drug susceptibility test (DST) (median 11 vs. 17 days, Hazard Ratio 0.67 [0.62–0.72]) and culture (5 vs. 8 days, 0.68 [0.65–0.72]) results. The time to treatment was not significantly different, but patients in intervention HCs took 16 days (20%) less time to culture convert (p = 0.047). Conclusions The eChasqui system reduced the time to communicate results between laboratories and HCs and time to culture conversion. It is now used in over 259 HCs covering 4.1 million people. This is the first randomized controlled trial of a laboratory information system in a developing country for any disease and the only study worldwide to show clinical impact of such a system. Trial Registration ClinicalTrials.gov NCT01201941
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