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Search Results: 1 - 10 of 297706 matches for " Mirta; Durán T "
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ESTUDIO DESCRIPTIVO DE LA FRECUENCIA Y DURACIóN DE LA PUBLICIDAD ALIMENTARIA EMITIDA EN LA PROGRAMACIóN DE CANALES DE TELEVISIóN ASOCIADOS A ANATEL
Crovetto M,Mirta; Durán T,Marion; Guzmán R,Mariel; Miranda H,Carla;
Revista chilena de nutrición , 2011, DOI: 10.4067/S0717-75182011000300005
Abstract: the objective of this study was to analyze television advertisements from different tv channels which are part of the chilean national television association. during one week in january and one week in february of 2010 the advertisements were screened. the analysis selected and classified food's advertising as healthy, moderately healthy and unhealthy based on food's critic nutritional components: total fat, saturated fat, carbohydrates and sodium using as reference a classification chart called "traffic light system" and created by the uk food standard agency. sixty thousand four hundred and twenty five (6.425) advertisements were registered and analyzed accounting for 56 hours and 36 minutes in total. one thousand forty five (1.045) advertisements were identified as food advertisements (16%) accounting for 7 hours and 42 minutes (14%) of the total. nutritional labels of the products were studied in order to classify and select them as described above. from the total offood advertisements it was observed that 64% were related to unhealthy food; 27% to moderately healthy and 9% to healthy food; accounting for respectively 62%, 30% and 8%, respectively, of the total time reported on food advertisement. food advertisements are mostly unhealthy, promoting food consumption with high levels of fat, sugar and sodium. the broadcasting of this type of advertisements by television promotes the population to follow unhealthy life styles which result in a deterioration of their health.
ESTUDIO DESCRIPTIVO DE LA FRECUENCIA Y DURACIóN DE LA PUBLICIDAD ALIMENTARIA EMITIDA EN LA PROGRAMACIóN DE CANALES DE TELEVISIóN ASOCIADOS A ANATEL DESCRIPTIVE STUDY OF THE FREQUENCY AND DURATION OF FOOD ADVERTISEMENT IN THE PROGRAMMING OF THE TELEVISION CHANNELS MEMBERS OF THE ANATEL GROUP
Mirta Crovetto M,Marion Durán T,Mariel Guzmán R,Carla Miranda H
Revista Chilena de Nutricíon , 2011,
Abstract: El objetivo de este estudio, fue describir la Publicidad Alimentaria emitida por los canales pertenecientes a la Asociación Nacional de Televisión. En una semana de enero y una de febrero del a o 2010 se seleccionó y clasificó la publicidad alimentaria emitida como saludable, medianamente saludable y no saludable, en base al contenido de nutrientes críticos; grasa total, grasa saturada, hidratos de carbono simples y sodio. Se utilizó como criterio de referencia, la tabla de clasificación de la Agencia Nacional de Alimentos de Inglaterra, denominada "semáforo nutricional". Se registraron y analizaron 6425 anuncios correspondientes a 56 horas 36 minutos continuas de tiempo, de ellos, se identificaron 1045 anuncios alimentarios (16%), equivalente en tiempo a 7 horas 42 minutos (14%) del total. Se examinaron las etiquetas nutricionales de los productos para la selección y calificación en saludable, medianamente saludable y no saludable. Se observó, que del total de la publicidad alimentaria, el 64% correspondió a publicidad alimentaria no saludable; el 27%, a publicidad alimentaria medianamente saludable y, el 9% publicidad alimentaria saludable, con un tiempo de emisión de un 62%, 30% y 8%, respectivamente. La publicidad alimentaria emitida es principalmente no saludable, promueve el consumo de alimentos altos en grasa, azúcar y sodio. La televisión al emitir esta publicidad promueve e incentiva a la población a llevar estilos de vida no saludables, en desmedro de la salud de la población. The objective of this study was to analyze television advertisements from different TV channels which are part of the Chilean National Television Association. During one week in January and one week in February of 2010 the advertisements were screened. The analysis selected and classified food's advertising as healthy, moderately healthy and unhealthy based on food's critic nutritional components: total fat, saturated fat, carbohydrates and sodium using as reference a classification chart called "Traffic Light System" and created by the UK Food Standard Agency. Sixty thousand four hundred and twenty five (6.425) advertisements were registered and analyzed accounting for 56 hours and 36 minutes in total. One thousand forty five (1.045) advertisements were identified as food advertisements (16%) accounting for 7 hours and 42 minutes (14%) of the total. Nutritional labels of the products were studied in order to classify and select them as described above. From the total offood advertisements it was observed that 64% were related to unhealthy food; 27% to moderately healthy
Orthogonal matrix polynomials satisfying differential equations with recurrence coefficients having non-scalar limits
Jorge Borrego,Mirta Castro,Antonio J. Durán
Mathematics , 2011,
Abstract: We introduce a family of weight matrices $W$ of the form $T(t)T^*(t)$, $T(t)=e^{\mathscr{A}t}e^{\mathscr{D}t^2}$, where $\mathscr{A}$ is certain nilpotent matrix and $\mathscr{D}$ is a diagonal matrix with negative real entries. The weight matrices $W$ have arbitrary size $N\times N$ and depend on $N$ parameters. The orthogonal polynomials with respect to this family of weight matrices satisfy a second order differential equation with differential coefficients that are matrix polynomials $F_2$, $F_1$ and $F_0$ (independent of $n$) of degrees not bigger than 2, 1 and 0 respectively. For size $2\times 2$, we find an explicit expression for a sequence of orthonormal polynomials with respect to $W$. In particular, we show that one of the recurrence coefficients for this sequence of orthonormal polynomials does not asymptotically behave as a scalar multiple of the identity, as it happens in the examples studied up to now in the literature.
Electrochemical biosensor-based devices for continuous phenols monitoring in environmental matrices
Freire, Renato S.;Durán, Nelson;Kubota, Lauro T.;
Journal of the Brazilian Chemical Society , 2002, DOI: 10.1590/S0103-50532002000400008
Abstract: a flow system method for continuous determination of phenolic compounds in environmental matrices was employed using a dialysis membrane sampler and laccase- and tyrosinase-based biosensors as detector. the biosensors response to different phenolic compounds was investigated. the laccase-based biosensor showed high sensitivity to guaiacol and chloroguaiacol, while the tyrosinase-based biosensor was more sensitive to phenol and chlorophenol. both of the biosensors presented highly selective measurements of micromolar concentration of these compounds. detection limits around 1.1 x 10-7 mol l-1 for guaiacol and 1.9 x 10-7 mol l-1 for chloroguaiacol could be estimated for the laccase-based biosensor. using the tyrosinase-based biosensor detection limits of 1.5 x 10-7 mol l-1 for phenol and 9.0 x 10-8 mol l-1 for chlorophenol were observed. the proposed flow method presented a linear response range between 1.0 mmol l-1 and 100.0 mmol l-1, in the optimized operational conditions (laccase-based biosensor: ph 5.0 and 0 mv vs ag/agcl as working potential; tyrosinase-based biosensor: ph 5.5 and 50 mv vs ag/agcl as working potential). real paper mill effluent sample was analyzed by this system and by the reference colorimetric method and the results were discussed.
Red de vigilancia de resistencia antimicrobiana PRONARES: Informe primer semestre 2001
Trucco A.,Olivia; Prado J.,Valeria; Durán T.,Claudia; ,;
Revista chilena de infectología , 2002, DOI: 10.4067/S0716-10182002019200015
Abstract: during the last years we have seen are emerging antimicrobial agents resistance that compromise more strains, new species and new mechanisms. in november 1997 we iniciated a network of antimicrobial surveillance named pronares in differents hospitals that working with a unique protocol (20 strains by month by syndrome) and using a computational software whonet surveys the resistance in chile. the results obtained during the first semester of 2001 shows the susceptibility pattern of 5.251 strains isolated from different clinical syndromes. in urinary tract infections e. coli (1.088 strains) were very susceptible to all the antibiotics tested, klebsiella spp (1.000 strains) were more resistant. in enterococcus we observed 30% of ciprofloxacin resistance and 2% of nitrofurantoin resistance. among 899 invasive strains, s. aureus (655 strains) presented a high methicillin resistance level (40%) more than 20% observed in skin and soft tissue infections. shigella spp (137) presented 80% of ampicillin resistance and 32% to chloramphenicol. ciprofloxacin and furazolidone had better activity. comparing nosocomial and community strains, the higher pattern of resistance was observed in nosocomial strains. it is very important to maintain the surveillance network to prescribe the appropriate antimicrobial and to avoid the increase of resistance
Perfil de susceptibilidad a los antimicrobianos en cepas de E coli productoras de Shiga toxina (STEC) aisladas de infecciones humanas y de alimentos
Reyes S,Marcelo; Durán T,Claudia; Prado J,Valeria;
Revista médica de Chile , 2004, DOI: 10.4067/S0034-98872004001000008
Abstract: background: shiga toxin-producing e coli (stec) are zoonotic pathogens associated to sporadic episodes of bloody diarrhea, foodborne outbreaks, and hemolytic uremic syndrome (hus), with worldwide public health impact. antibiotic use in stec infections is controversial because of the potential to increase production and secretion of shiga toxins. aim: to study the in vitro antimicrobial susceptibility profile of stec. material and methods: the in vitro susceptibility profile against 10 antimicrobials of stec strains isolated from 29 meat products, 20 patients with diarrhea and 9 hus patients was studied. minimal inhibitory concentrations (μg/ml) by agar dilution method for ampicillin, cloramphenicol, ciprofloxacin, amikacin, gentamycin, cotrimoxazol, ceftriaxone, tetracycline, fosfomycin and azithromycin were measured according to nccls recommendations. results: strains from patients with diarrhea or hus were all susceptible to the 10 antimicrobials and only 13.7% had intermediate resistance to cloramphenicol. strains from meat products had a similar susceptibility profile, with only 3.5% resistance to tetracycline, 3.5% intermediate resistance to cloramphenicol and 7% to fosfomycin. all 58 strains were considered resistant to azithromycin (mic >32 ug/ml). conclusions: similarity of susceptibility profiles between stec strains from human and food origin suggests a role of food chain in transmission to humans (rev méd chile 2004; 132: 1211-6)
Red de vigilancia de resistencia antimicrobiana PRONARES: Informe primer semestre 2001 PRONARES ANTIMICROBIAL SURVEILLANCE NETWORK ON ANTIMICROBIAL AGENTS RESISTANCE: REPORT OF THE FIRST SEMESTER 2001
Olivia Trucco A.,Valeria Prado J.,Claudia Durán T.
Revista chilena de infectología , 2002,
Abstract: En el transcurso de los a os hemos sido testigos de un creciente problema de resistencia antimicrobiana, fenómeno que involucra cada día mayor número de cepas, nuevas especies y nuevos mecanismos. En noviembre de 1997 iniciamos una red de vigilancia de resistencia antimicrobiana PRONARES (Programa Nacional de Resistencia), en diferentes hospitales del país, que trabajando un protocolo común (20 cepas por síndrome clínico por mes) y utilizando un programa computacional WHONET (dise ado para vigilancia), nos permitiera detectar y monitorear el problema de la resistencia bacteriana en Chile. Los resultados del primer semestre de este a o reportan 5.251 cepas de diferentes síndromes clínicos. En ITU, Escherichia coli (1.088 cepas) demostró alta susceptibilidad a todos los antimicrobianos, Klebsiella (1.000 cepas) demostró un perfil de resistencia más elevado, en cepas de Enterococcus spp se observó 30% de resistencia a ciprofloxacina y 2% a nitrofurantoína. Entre 899 cepas procedentes de infecciones invasoras, Staphylococcus aureus (555 cepas), mostró elevado perfil de resistencia a cloxacilina 40% superior -40%- (21%) al observado en cepas aisladas de piel y tejidos blandos (550). Shigella spp, (137 cepas) presentó 80% de resistencia a ampicilina y 32% a cloranfenicol; ciprofloxacina y furazolidona demostraron muy buena actividad in vitro frente a este enteropatógeno. Al comparar cepas nosocomiales y de la comunidad, las primeras mostraron un perfil de mayor resistencia. Mantener una red nacional de vigilancia de resistencia se hace cada vez más necesario para orientar el uso adecuado de antibacterianos y evitar así que el fenómeno aumente During the last years we have seen are emerging antimicrobial agents resistance that compromise more strains, new species and new mechanisms. In November 1997 we iniciated a network of antimicrobial surveillance named PRONARES in differents hospitals that working with a unique protocol (20 strains by month by syndrome) and using a computational software WHONET surveys the resistance in Chile. The results obtained during the first semester of 2001 shows the susceptibility pattern of 5.251 strains isolated from different clinical syndromes. In urinary tract infections E. coli (1.088 strains) were very susceptible to all the antibiotics tested, Klebsiella spp (1.000 strains) were more resistant. In Enterococcus we observed 30% of ciprofloxacin resistance and 2% of nitrofurantoin resistance. Among 899 invasive strains, S. aureus (655 strains) presented a high methicillin resistance level (40%) more than 20% observed in skin
Perfil de susceptibilidad a los antimicrobianos en cepas de E coli productoras de Shiga toxina (STEC) aisladas de infecciones humanas y de alimentos Antimicrobial susceptibility of Shiga toxin producing E coli (STEC) strains isolated from human infections and food
Marcelo Reyes S,Claudia Durán T,Valeria Prado J
Revista médica de Chile , 2004,
Abstract: Background: Shiga toxin-producing E coli (STEC) are zoonotic pathogens associated to sporadic episodes of bloody diarrhea, foodborne outbreaks, and Hemolytic Uremic Syndrome (HUS), with worldwide public health impact. Antibiotic use in STEC infections is controversial because of the potential to increase production and secretion of Shiga toxins. Aim: To study the in vitro antimicrobial susceptibility profile of STEC. Material and methods: The in vitro susceptibility profile against 10 antimicrobials of STEC strains isolated from 29 meat products, 20 patients with diarrhea and 9 HUS patients was studied. Minimal Inhibitory Concentrations (μg/ml) by agar dilution method for ampicillin, cloramphenicol, ciprofloxacin, amikacin, gentamycin, cotrimoxazol, ceftriaxone, tetracycline, fosfomycin and azithromycin were measured according to NCCLS recommendations. Results: Strains from patients with diarrhea or HUS were all susceptible to the 10 antimicrobials and only 13.7% had intermediate resistance to cloramphenicol. Strains from meat products had a similar susceptibility profile, with only 3.5% resistance to tetracycline, 3.5% intermediate resistance to cloramphenicol and 7% to fosfomycin. All 58 strains were considered resistant to azithromycin (MIC >32 ug/ml). Conclusions: Similarity of susceptibility profiles between STEC strains from human and food origin suggests a role of food chain in transmission to humans (Rev Méd Chile 2004; 132: 1211-6)
Aplicación de la capacidad bactericida del cobre en la práctica médica Application of copper bactericidal properties in medical practice
Valeria Prado J,Roberto Vidal A,Claudia Durán T
Revista médica de Chile , 2012,
Abstract: Background: Copper is essential for cell metabolism in animals and plants and thus for life. Along centuries, copper has been identified as a metal containing antimicrobial properties. In recent years, laboratory assays and clinical studies have revealed that surfaces of metallic copper or its alloys, containing at least 70% copper, eliminate in a few hours several pathogenic organisms including bacterial strains associated with nosocomial infections, influenza virus, HIV, and fungi such as Candida albicans. In March 2008, the American Environmental Protection Agency (EPA), supported by scientific evidence gathered to date, registered copper as the first and only metal with antimicrobial properties. We herein review certain mechanisms proposed for the antibacterial, antiviral and antifungal activity of copper. We also discuss in vitro and clinical efficacy studies developed world wide and in Chile, focusing on bactericidal activity of copper surface areas in comparison to materials typically used in hospital environments such as stainless steel and polymers. Scientific evidence gathered to date, consistently shows that the use of copper surface areas in high contact critical points in hospitals, significantly reduces environmental bacterial load. This is associated with a decreased risk of pathogen transmission to patients and represents therefore an interesting complement to infection control programs.
Electrochemical biosensor-based devices for continuous phenols monitoring in environmental matrices
Freire Renato S.,Durán Nelson,Kubota Lauro T.
Journal of the Brazilian Chemical Society , 2002,
Abstract: A flow system method for continuous determination of phenolic compounds in environmental matrices was employed using a dialysis membrane sampler and laccase- and tyrosinase-based biosensors as detector. The biosensors response to different phenolic compounds was investigated. The laccase-based biosensor showed high sensitivity to guaiacol and chloroguaiacol, while the tyrosinase-based biosensor was more sensitive to phenol and chlorophenol. Both of the biosensors presented highly selective measurements of micromolar concentration of these compounds. Detection limits around 1.1 x 10-7 mol L-1 for guaiacol and 1.9 x 10-7 mol L-1 for chloroguaiacol could be estimated for the laccase-based biosensor. Using the tyrosinase-based biosensor detection limits of 1.5 x 10-7 mol L-1 for phenol and 9.0 x 10-8 mol L-1 for chlorophenol were observed. The proposed flow method presented a linear response range between 1.0 mumol L-1 and 100.0 mumol L-1, in the optimized operational conditions (laccase-based biosensor: pH 5.0 and 0 mV vs Ag/AgCl as working potential; tyrosinase-based biosensor: pH 5.5 and 50 mV vs Ag/AgCl as working potential). Real paper mill effluent sample was analyzed by this system and by the reference colorimetric method and the results were discussed.
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