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Search Results: 1 - 10 of 29501 matches for " Luis;Bialostozky "
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Evaluación de la función y sincronía de la contracción ventricular en pacientes con enfermedad de Chagas en estadio de latencia
Nivardo Sobrino, Ayax;Jiménez-ángeles, Luis;Bialostozky, David;Vázquez, Clara;Martínez, Irma;Salazar-Schettino, Paz Maria;Bucio-Torres, Martha;Ruiz-Hernández, Adela;Cabrera-Bravo, Margarita;
Archivos de cardiología de México , 2009,
Abstract: objective: to compare the left ventricular function and the ventricular synchrony in patients with chagas disease in latency stage respect to a control group. methods: we analyze a prospective, comparative, transversal and non randomized study of the left ventricular function (lvf) and the ventricular contraction synchronicity (vcs) in 36 subjects with positive serology for chagas disease (18 males and 18 females), with mean of 15 ± 5 years old. the findings were compared with respect to 23 control volunteers (11 males and 12 females) with mean of 28 ± 5 years old. lvf and vcs were evaluated using equilibrium radionuclide angiography images (erna). the comparison of both chagas and control populations was carried out by t student test for independent samples, considering a statistically significant value of p < 0.05. results: the parameters of the ventricular function and the ventricular synchronicity in subjects with positive serology for chagas disease were not statistically different with respect to the parameters of the control group. however, although they have a homogeneous contraction, the mean time of contraction for the right and the left ventricle is statistically smaller with respect to the control group. conclusions: in clinically incipient stages of chagas disease we do not found abnormalities in the ventricular function and the ventricular synchronicity. it's necessary to consider the follow up of the studied populations using indices for the identification of abnormalities of the autonomic nervous system.
Detección de apoptosis en enfermedades cardiovasculares mediante las imágenes SPECT de cardiología nuclear
Bialostozky, David;Rodríguez-Diez, Gerardo;Zazueta, Cecilia;
Archivos de cardiología de México , 2008,
Abstract: apoptosis is a biological process of death or cellular suicide present in all the cells of the metazoans. it maintains the balance between the regeneration of pluripotential cells -or stem cells- and the elimination of cells that have already served their function, of cells that have reproduced in excess, or have been genetically damaged beyond repair. apoptosis activation in cardiomyocytes is a common problem in a large variety of cardiomyopathies; it has been suggested that it is an important contributor ventricular hypertrophy and to the increase of the infarct size in patients with cardiac failure and cardiovascular disease. clinical diagnosis of apoptosis is a reality in the medical science, its application in different aspects of cardiology includes from coronary cardiopathy to rhythm alterations. in this sense, the use of the non-invasive imaging, can be very useful for the in vivo detection of this type of cellular death in patients with myocardial necrosis, acute myocardial infarct, acute rejection of cardiac transplantation, myocarditis, intracardial malignant tumours, as well as in cardiotoxicity cases and other cardiomyopathies. particularly, binding of tc99m-labeled annexin v, produces gammagraphic images that allow the identification of apoptotic cells in vivo in spect and sestamibi systems. in summary, the use of these techniques will be invaluable in the near future for anti-apoptosis therapy and intervention in the routine of the daily cardiology practice.
Importancia del binomio corazón-cerebro en el manejo integral de las cardiopatías congénitas
Pando-Orellana, Luis A.;Buendía-Hernández, Alfonso;Calderón-Colmenero, Juan;Razo-Pinete, José Antonio;Pati?o, Emilia J.;Cervantes-Salazar, Jorge Luis;Meave-González, Aloha;Bialostozky, David;Corral-Mejorado, Iván;Curi-Curi, Pedro José;
Archivos de cardiología de México , 2010,
Abstract: a case of a two month infant with complex congenital heart disease (aortic coarctation with ventricular septal defect) associated to a cellular brain migration failure is presented. the management strategy consisted on the correction of congenital heart disease by means of a two-stage surgery without a further preoperative evaluation of the neurological status. the patient developed several perioperative complications such as two episodes of cardiac arrest, reconnection to cardiopulmonary bypass, cardiac tamponade, chilothorax and septic shock. a neurological protocol consisting in electroencephalography, brain magnetic resonance and single photon emission computed tomography (spect) was practiced during the postoperative period, which detected microgyria with paquigyria and a cellular brain migration failure was suspected. the final outcome was death due to multisystemic failure and the autopsy confirmed the neurological disease, as well as poor life function prognosis. should the heart-brain binomial had been considered in an integral preoperative evaluation, the therapeutical approach could have been modified.
Introducing Engineering Students to Historical/Cultural Perspectives through Story-Centered On-Line Learning  [PDF]
Luis A Godoy
Creative Education (CE) , 2011, DOI: 10.4236/ce.2011.22009
Abstract: Several authors argued that history of science should be an integral part of science education; however, there are many obstacles to carry out an implementation within this approach, including that lecturers normally lack a necessary historical background (a situation that is largely aggravated in engineering faculties), and the impossi- bility of including new courses or credits in an already tight curriculum. The development of on-line modules that engineering students can work outside their normal schedule of classes, introducing historical/cultural per- spectives, is presented in this paper. E-learning and knowledge management strategies are used in the context of science education at undergraduate and graduate levels. The approach is based on learning-by-doing in a virtual environment, and specifically presents story-centered activities, in which the student is faced with a problem and plays the role of an expert to provide a solution to the case. The specific case considered develops in the form of a controversy concerning the origin of the studies of column buckling. Two sets of information are available for navigation in the module: specific information that the student can explore (containing historical material di- rectly connected to the case provided), and more general information (providing the historical/cultural context to the problem). A first application has been made with civil engineering students, who had to write a two-page white paper as a consequence of their work on the problem. The interest generated in the participating students and the positive evaluation of their experience seems to indicate that this type of activity can serve to enhance traditional engineering lectures by incorporating a historical dimension. The present web-based approach could be extended to tackle similar conflicts in fields for which there is ample documentation available in the literature or in other historical episodes which may lead to rich discussions.
Present Status of the Development and Application of Transparent Conductors Oxide Thin Solid Films  [PDF]
Luis Casta?eda
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.29167

Luis Castañeda’s article, \"Present Status of the Development and Application of Transparent Conductors Oxide Thin Solid Films \", has been retraced by Ray Boxman because of plagiarism.

The scientific community takes a very strong view on this matter and we treat all unethical behavior such as plagiarism seriously. This paper published in Vol.2 No.9 1233-1242, 2011, has been removed from this site.


Processing Facilitation Strategies in OV and VO Languages: A Corpus Study  [PDF]
Luis Pastor, Itziar Laka
Open Journal of Modern Linguistics (OJML) , 2013, DOI: 10.4236/ojml.2013.33033

The present corpus study aimed to examine whether Basque (OV) resorts more often than Spanish (VO) to certain grammatical operations, in order to minimize the number of arguments to be processed before the verb. Ueno & Polinsky (2009) argue that VO/OV languages use certain grammatical resources with different frequencies in order to facilitate real-time processing. They observe that both OV and VO languages in their sample (Japanese, Turkish and Spanish) have a similar frequency of use of subject pro-drop; however, they find that OV languages (Japanese, Turkish) use more intransitive sentences than VO languages (English, Spanish), and conclude this is an OV-specific strategy to facilitate processing. We conducted a comparative corpus study of Spanish (VO) and Basque (OV). Results show (a) that the frequency of use of subject pro-drop is higher in Basque than in Spanish; and (b) Basque does not use more intransitive sentences than Spanish; both languages have a similar frequency of intransitive sentences. Based on these findings, we conclude that the frequency of use of grammatical resources to facilitate the processing does not depend on a single typological trait (VO/OV) but it is modulated by the concurrence of other grammatical features.

Past, Present and Future Climate of Antarctica  [PDF]
Alvarinho J. Luis
International Journal of Geosciences (IJG) , 2013, DOI: 10.4236/ijg.2013.46089

Anthropogenic warming of near-surface atmosphere in the last 50 years is dominant over the west Antarctic Peninsula. Ozone depletion has led to partly cooling of the stratosphere. The positive polarity of the Southern Hemisphere Annular Mode (SAM) index and its enhancement over the past 50 years have intensified the westerlies over the Southern Ocean, and induced warming of Antarctic Peninsula. Dictated by local ocean-atmosphere processes and remote forcing, the Antarctic sea ice extent is increasing, contrary to climate model predictions for the 21st century, and this increase has strong regional and seasonal signatures. Models incorporating doubling of present day CO2 predict warming of the Antarctic sea ice zone, a reduction in sea ice cover, and warming of the Antarctic Plateau, accompanied by increased snowfall.

An Extended Model of Currency Options Applicable as Policy Tool for Central Banks with Inflation Targeting and Dollarized Economies  [PDF]
Luis-Felipe Arizmendi
Theoretical Economics Letters (TEL) , 2013, DOI: 10.4236/tel.2013.33027

The purpose of this paper is to provide a new set of tools for policy makers at central banks. Based on the Garman-Kohlhagen [1] formula for currency options, this research extends it with the Taylor-rule expression used for inflation targeting, thus obtaining the corresponding Call and Put options and the first and higher-degree partial derivatives known as “Greeks” for key variables such as the policy target domestic interest rate and the output gap.

New Evidence on Rotational Dynamics  [PDF]
Luis Alberto Pérez
World Journal of Mechanics (WJM) , 2013, DOI: 10.4236/wjm.2013.33016

In this paper, the author confirmed a new theory to explain the mechanical behavior of macroscopic bodies. The confirmed hypothesis is the Theory of Dynamics Interaction by the Professor Gabriel Barceló. Barceló explained his theory in an article called “Analysis of Dynamics Fields in Noninertial Systems”, World Journal of Mechanics, Vol. 2, No. 3, 2012, pp. 175-180. This hypothesis holds that the mechanical behavior of macroscopic bodies in a non-inertial environment opens new assumptions on inertial fields and rotational dynamics. An associated experiment was presented to support the discussion in the paper. The author first became aware of the proposals of Professor Gabriel Barceló’s Theory of Dynamics Interaction through his 2006 article on Saturn planet rings, which suggested unsolved phenomena in rotational dynamics and the inception of a novel theory [1]. Intuitively, the author realized himself about the fact that the cosmos is mechanical from its smallest to its widest comprehensible appreciation. If material behavior is mechanical everywhere and every time, from a subatomic particle, wave or string, to a cluster of galaxies, then our understandable solutions must comply with the Laws of Motion, it could be believed.

The Cardiovascular Benefits of Polyphenol Compounds  [PDF]
Anthony San Luis
Advances in Anthropology (AA) , 2013, DOI: 10.4236/aa.2013.34025

In comparison, polyphenols are one of the most diverse to most other groups of bioactive phytochemicals. Polyphenols can be found in a wide range of foods that are derived from plants. Polyphenols are made up of various subgroups, but it’s the phenolics, stillbenes, and flavonoids that engender positive impacts on cardiovascular health. These three phytochemical compounds can reduce cardiovascular conditions such as hypertension and coronary heart disease. Remarkably, polyphenols and its subgroups can be found ubiquitously in most human diets. As a result, many studies have effectively illustrated the positive impacts polyphenols can induce when processed by the human body. Furthermore, research efforts have shown that modern diets and more “traditional” diets have unknowingly promoted the consumption of foods rife with polyphenols. These findings are starting to be incorporated into the public health discipline as a more practical option for more sustainable nutritional interventions. In all, polyphenols can produce a myriad of positive developments on at the micro and macro level.

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