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Search Results: 1 - 10 of 420167 matches for " C. Suárez Nú?ez "
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Efecto hemolítico de la cloroquina en estudiantes deficientes de glucosa-6-fosfato deshidrogenasa
Acosta,Tatiana; Suárez,Mayelin; Nú?ez,Vladimir; Marín,Lilia C.; Cordero,Altinay;
Revista Cubana de Investigaciones Biom??dicas , 2003,
Abstract: the presence of students carriers of the deficiency in the glucose-6-phosphate erytrocitary dehydrogenase enzyme was studied at the "victoria de girón" institute of basic and preclinical sciences by using the methylene blue method, the enzymatic activity and the starch gel electrophoresis. later, it was studied the hemolytic effect of the prophylactic administration of chloroquine phosphate to these subjects and the variations in the concentration of hemoglobin and hematocrit with clinical significance before and after the treatment with this drug. the existance of diseases associated with hemolytic pictures among individuals carriers of this disease was discarded. of the 994 latin american students attended at the institute in 2001, 8 were confirmed as g6pd deficient. the treatment with chloroquine did not cause hemolysis.
Efecto hemolítico de la cloroquina en estudiantes deficientes de glucosa-6-fosfato deshidrogenasa
Tatiana Acosta,Mayelin Suárez,Vladimir Nú?ez,Lilia C. Marín
Revista Cubana de Investigaciones Biom??dicas , 2003,
Abstract: Se estudió la presencia de estudiantes portadores de la deficiencia en la enzima glucosa-6-fosfato deshidrogenasa eritrocitaria en el Instituto de Ciencias Básicas y Preclínicas "Victoria de Girón" mediante el del azul de metileno, la actividad enzimática y la electroforesis en geles de almidón. Luego se estudió el efecto hemolítico de la administración profiláctica de fosfato de cloroquina en estos sujetos, estudiando las variaciones con significación clínica en la concentración de hemoglobina y el hematócrito, antes y después del tratamiento con este fármaco. Se descartó la presencia de enfermedades asociadas a cuadros hemolíticos en sujetos portadores de esta deficiencia. De los 994 estudiantes latinoamericanos que arribaron al instituto en el a o 2001, 8 fueron confirmados como deficientes de G6PD y el tratamiento de cloroquina suministrado no provocó hemólisis. The presence of students carriers of the deficiency in the glucose-6-phosphate erytrocitary dehydrogenase enzyme was studied at the "Victoria de Girón" Institute of Basic and Preclinical Sciences by using the methylene blue method, the enzymatic activity and the starch gel electrophoresis. Later, it was studied the hemolytic effect of the prophylactic administration of chloroquine phosphate to these subjects and the variations in the concentration of hemoglobin and hematocrit with clinical significance before and after the treatment with this drug. The existance of diseases associated with hemolytic pictures among individuals carriers of this disease was discarded. Of the 994 Latin American students attended at the Institute in 2001, 8 were confirmed as G6PD deficient. The treatment with chloroquine did not cause hemolysis.
A Simple Deterministic Lorenz Chaotic-Based Methodology to Cipher and Decipher Information
Suárez Casta?ón, Miguel S.;Aguilar Iba?ez, Carlos;Martínez García, Juan C.;
Computación y Sistemas , 2007,
Abstract: we present a secure deterministic cipher and decipher mechanism based on the well-known lorenz dynamic system. the ciphering process is performed by the combination of the message to be ciphered and the states of the lorenz dynamic system, which act as the ciphering key. the deciphering process is implemented by the reconstruction of the key, which is generated using a lorenz system state observer. the observed key is then used in the decipher process in order to recover the ciphered message.
Composición y distribución de la ictiofauna en la Laguna del Mar Muerto, Pacifico mexicano
M. Tapia-García,C. Suárez Nú?ez,G. Cerdenares,L. de Guevara
Revista de Biología Tropical , 1998,
Abstract: La Laguna del Mar Muerto, Oaxaca-Chiapas fue muestreada entre 1991 y 1993 con el objetivo de caracterizar la ictiofauna en cuanto a su composición y abundancia. Se colectaron un total de 27 971 peces que aportaron 120.9 kg. La ictiofauna de la región está caracterizada por 29 familias, 45 géneros y 66 especies. El mayor número de especies se presenta en la parte sureste de la laguna (cerca de la Boca de Tonalá), área con mayor influencia marina, abundante vegetación costera y mayor descarga fluvial. El menor número de especies se presenta en la parte más interna de la laguna, caracterizada por hipersalinidad en la época de secas y baja salinidad en la época de lluvias. Las especies que presentan amplia distribución son Diapterus peruvianus, Lile stolifera, Anchoa lucida, Anchoa mundeola, Mugil curema, Atherinella guatemalensis y Anchovia macrolepidota. Fish composition was sampled in Mar Muerto Lagoon (Mexico) between 1991 and 1993. A total of 27 971 fish with a weight of 120.9 kg were collected. The total sample consists of 29 families, 45 genera and 66 species. The highest number of species is in the area with strong marine influence (near Tonala Inlet), abundant coastal vegetation and fluvial discharge. The lowest number of species is in the inner part of the lagoon, which is hipersaline in the dry season and of low salinity in the rainy season. The species with broad distribution are Diapterus peruvianus, Lile stolifera, Anchoa lucida, Anchoa mundeola, Mugil curema, Atherinella guatemalensis and Anchovia macrolepidota.
A hamiltonian control approach for the stabilization of the angular velocity of a rigid body system controlled by two torques
Aguilar-Ibá?ez, C.;Suárez-Casta?ón, M.S.;Guzmán-Aguilar, F.;
Revista mexicana de física , 2008,
Abstract: we present a hamiltonian control approach for the stabilization of a rigid body system that is controlled by two torques. the stabilization strategy consists in solving a feasible matching condition in order to derive a feedback controller which forces the closed-loop system to be globally asymptotically stable.
A hamiltonian control approach for the stabilization of the angular velocity of a rigid body system controlled by two torques
C. Aguilar-Ibá?ez,M.S. Suárez-Casta?ón,F. Guzmán-Aguilar
Revista mexicana de física , 2008,
Abstract: Presentamos un enfoque de control Hamiltoniano para la estabilización de un sistema de cuerpo rígido que es controlado por dos torques. La estrategia de control consiste en resolver una condición de acoplamiento conveniente con el fin de derivar un eontrolador de retroalimentaeión que haga al sistema en lazo cerrado global y asintóticamente estable.
On recovering the parametric model of the Chua system via a gradient algorithm
Aguilar-Ibá?ez, C.;Hernández-Rubio, E.;Suárez-Casta?ón, M.S.;
Revista mexicana de física , 2007,
Abstract: the chua circuit parameter estimation problem is addressed in this paper. this circuit is algebraically observable and identifiable with respect to its two measurable voltages. this fact allows us to straightforwardly propose two linear estimators for recovering the unknown parameters, where the estimator gains are continuously adjusted by means of a gradient algorithm, until the estimated parameters converge to the actual values. the convergence of this method is demonstrated by using the lyapunov method.
Plan de Manejo Ambiental del Laboratorio de Ingeniería Química (LIQ) de la Universidad Nacional de Colombia, sede Bogotá Environmental Management Plan for the Chemical Engineering Laboratory (LIQ) of the National University of Colombia, Bogotá
Chávez Javier Gama,Lozano García Martha,Narváez Rincón Paulo César,Suárez Medina óscar Javier
Ingeniería e Investigación , 2004,
Abstract: Con el fin de fortalecer el desempe o ambiental del Laboratorio de Ingeniería Química (LIQ), se formuló un Plan de Manejo Ambiental con base en los principios establecidos por la norma ISO 14001. Como primer paso, se propuso la política ambiental; posteriormente, después de una revisión inicial, se identificaron los impactos ambientales significativos relacionados con las actividades que se desarrollan en el laboratorio, los cuales corresponden a acumulación de residuos químicos peligrosos, contaminación del agua por generación de vertimientos y contaminación del aire. A partir de esta identificación, se formularon programas de seguimiento y control de los mismos, así como un programa de divulgación y capacitación, todos con su documentación correspondiente, plasmada en el Plan de Manejo Ambiental propiamente dicho y en el Manual de procedimientos ambientales. An Enviromental Management Plan was formulated with the objective of improving the environmental performance of the Chemical Engineering Laboratory (LIQ). The plan was supported on the principles established by the ISO 140001 standard. In a first step, an environmental politic was proposed. Next, by means of an initial review of the laboratory, the most significant impacts related to the activities developed in the Laboratory were identified: dangerous chemical wastes accumulation, water contamination by effusions generation and air contamination. These impacts were the base for formulating following and control programs, furthermire, a training an communication program was done. All the programs, including the requiered documents and procedures, were published in the Environmental Management Plan and the Environmental Procedures Manual.
On recovering the parametric model of the Chua system via a gradient algorithm
C. Aguilar-Ibá?ez,E. Hernández-Rubio,M.S. Suárez-Casta?ón
Revista mexicana de física , 2007,
Abstract: En este trabajo se trata el problema de estimaci′on de los par′ametros del circuito de Chua. Este circuito es algebraicamente observable e identificable con respecto a sus dos voltajes disponibles. Este hecho nos permite proponer directamente dos estimadores lineales para la recuperaci′on de los par′ametros desconocidos, donde las ganancias de los estimadores son ajustadas continuamente mediante un algoritmo de gradiente, hasta que los par′ametros estimados convergen con los valores reales. La convergencia de este m′etodo es demostrada empleando el m′etodo de Lyapunov.
Clinical and ethical implications of genetic counselling in familial adenomatous polyposis
Fernández-Suárez,A.; Cordero Fernández,C.; García Lozano,R.; Pizarro,A.; Garzón,M.; Nú?ez Roldán,A.;
Revista Espa?ola de Enfermedades Digestivas , 2005, DOI: 10.4321/S1130-01082005000900006
Abstract: the association of specific genetic disturbances with the development of hereditary cancer helps us to understand the risk of suffering from it, the possibility of an earlier diagnosis, and the treatment and prevention of this disease. familial adenomatous polyposis (fap) is a pre-neoplastic syndrome characterized by the presence of hundreds of adenomatous polyps in the colon, which develop into a carcinoma. fap can be diagnosed using sequencing techniques to detect mutations in the germinal line of the apc (adenomatous polyposis coli) gene. the genetic diagnostic approach in families with fap, previously followed up in the gastrointestinal clinic, has both advantages and disadvantages, and places us nearer the disease and patient. disclosing the results of this genetic test entails relevant problems in clinical practice, which affect the health field and raise legal and ethical issues, along with the familial, occupational, and social implications that knowing the genetic status can have on the patient. genetic analysis is rare in normal clinical practice, which involves errors in the interpretation of the results obtained, and during the process of genetic counselling. specialized multidisciplinary units are necessary for the management of patients with fap undergoing analysis and appropriate genetic counselling, thus providing an individualized service. the creation of fap registers and protocols for this healthcare process should optimize the management of these patients and their families.
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