Tracking of structural defects induced by Eu-doping in ß-Ag2MoO4: their influences on electrical properties.

In this study, several methods were employed to investigate the electrical characteristics of ß-Ag2MoO4 systems, both Eu-doped and undoped, synthesized using the microwave-assisted hydrothermal method. The focus extended to understanding how synthesis time influences material defects, with doping fixed at 1%. A systematic shift in the silver vacancy (VAg) concentration was observed within the doped ß-Ag2MoO4 system. Specifically, this study demonstrated that the incorporation of Eu3+ into polycrystalline ß-Ag2MoO4 initially increases the VAg concentration. However, as the synthesis time progresses, the VAg concentration decreases, resulting in alterations in the resulting electrical properties, arising from the intricate interplay between the number of grain boundaries and carrier density. By combining information obtained from photoluminescence, positron annihilation lifetime spectroscopy, and impedance spectroscopy, a comprehensive conduction mechanism was formulated, shedding light on both doped and undoped ß-Ag2MoO4 systems.

Tuning the morphology to enhance the catalytic activity of α-Ag2WO4 through V-doping.

Here, we present the synthesis of a highly efficient V-doped α-Ag2WO4 catalyst for the oxidation of sulfides to sulfones, exhibiting a high degree of tolerance towards various sensitive functional groups. Remarkably, the catalysts with 0.01% V-doping content exhibited outstanding selectivity towards the oxidation process. Scavenger experiments indicated the direct involvement of electron-hole (e-/h+) pairs, hydroxyl radical (˙OH), and singlet oxygen (1O2) in the catalytic mechanism. Based on the experimental and theoretical results, the higher activity of the V-doped α-Ag2WO4 samples was associated with the preferential formation of the (100) surface in the catalyst morphology.

Novel Approaches of Nanoceria with Magnetic, Photoluminescent, and Gas-Sensing Properties.

The modification of CeO2 with rare-earth elements opens up a wide range of applications as biomedical devices using infrared emission as well as magnetic and gas-sensing devices, once the structural, morphological, photoluminescent, magnetic, electric, and gas-sensing properties of these systems are strongly correlated to quantum electronic transitions between rare-earth f-states among defective species. Quantitative phase analysis revealed that the nanopowders are free from secondary phases and crystallize in the fluorite-type cubic structure. Magnetic coercive field measurements on the powders indicate that the substitution of cerium with lanthanum (8 wt %), in a fluorite-type cubic structure, created oxygen vacancies and led to a decrease in the fraction of Ce species in the 3+ state, resulting in a stronger room-temperature ferromagnetic response along with high coercivity (160 Oe). In addition to the magnetic and photoluminescent behavior, a fast response time (5.5 s) was observed after CO exposure, indicating that the defective structure of ceria-based materials corresponds to the key of success in terms of applications using photoluminescent, magnetic, or electrical behaviors.

Registro del Grupo NADYA-SENPE de Nutrición Enteral Domiciliaria en España; años 2016 y 2017 / Spanish home enteral nutrition registry of the year 2016 and 2017 from the NADYA-SENPE Group

Objetivo: exponer los resultados del registro de nutrición enteral domiciliaria (NED) de los años 2016 y 2017 del Grupo NADYA-SENPE. Material y métodos: se recopilaron los pacientes introducidos en el registro del 1 de enero al 31 de diciembre de 2016 y la mismas fechas de 2017 para proceder al análisis descriptivo y analítico de los datos. Resultados: en el año 2016 se obtuvieron 4.578 pacientes activos (prevalencia = 98,33 pacientes/millón de habitantes) y en 2017 fueron 4.777 (prevalencia = 102,57). Por sexos, hubo un 50,8% de varones en 2016 y un 50,5% en 2017. En el periodo 2016-17, la edad mediana fue de 71,5 años (IIQ 57-83); asimismo, finalizaron 1.558 episodios de NED y la causa principal fue el fallecimiento (793 pacientes, 50,89%). Los varones adultos fueron más jóvenes que las mujeres (65,3 vs. 73,3 años, p-valor < 0,001) y el diagnóstico más frecuente fue la enfermedad neurológica que cursa con afagia o disfagia severa (59%). La sonda nasogástrica (SNG) fue la vía de acceso más utilizada (48,3%) y se observa, además, que esta es la vía que se utiliza en los pacientes más ancianos (p < 0,001). Se registraron 126 pacientes pediátricos (57,1% niñas). La edad mediana de inicio de la NED fue de cuatro meses. Otras patologías fue el grupo diagnóstico más registrado (41,3%), seguido por la enfermedad neurológica que cursa con afagia o disfagia severa. Se alimentaban a través de gastrostomía en el 57,6% de los casos. Se observó que los niños más pequeños eran los que se alimentaban preferentemente por SNG (p-valor 0,001). Conclusiones: el número de pacientes del registro, así como el número de centros participantes, se va incrementando progresivamente. Las principales características de los pacientes no han variado. A pesar del aumento de posibilidades diagnósticas en la población pediátrica, llama la atención la clasificación dentro del grupo de Otras patologías

Objective: to present the results of the Spanish home enteral nutrition (HEN) registry of the NADYA-SENPE group for the year 2016 and 2017. Material and methods: from January 1st 2016 to December 31st 2017, the HEN registry was recorded and afterwards a further descriptive and analytical analysis was done. Results: in 2016, 4,578 active patients were recorded and prevalence was 98.33 patients per one million inhabitants; in 2017, 4,777 patients were recorded, with a prevalence of 102.57 per one million inhabitants; 50.8% were males in 2016 and 50.5% in 2017. During the period 2016-17, median age was 71.5 years (IIQ 57-83), 1,558 HEN episodes were finished and the main cause was death (793 patients, 50.89%). Adult males were younger than females (65.3 vs. 73.3 years, p-value < 0.001). The most frequent diagnosis was the neurological disorder that presents with aphagia or severe dysphagia (59%). Nasogastric tube was the most frequent administration route (48.3%) and it is the most widely used in elderly patients (p < 0.001). One hundred and twenty-six pediatric patients were registered (57.1% females). Median age at the beginning of HEN in children was four months. "Other disorders" was the most recorded diagnostic group (41.3%), followed by the group of neurological disorder that presents with aphagia or severe dysphagia. Regarding children, 57.6% were fed through gastrostomy and the younger ones were fed through nasogastric tube (p-value 0.001). Conclusions: the number of patients in the registry, as well as the number of participating centers, is progressively increasing. The main characteristics of the patients have not changed. Despite the increase in diagnostic possibilities in the pediatric population, the classification within the group of "Other pathologies" is quite significant

Nanocellulose-Block Copolymer Films for the Removal of Emerging Organic Contaminants from Aqueous Solutions.

The prevalence of emerging organic contaminants (EOCs) in ground and surface water has sparked the search for more effective methods to remove EOCs from the environment. In pursuit of a solution for this environmental concern, herein we present the development of reusable films based on cellulose nanofibers (CNFs) and the block copolymer, poly(4-vinylpyridine-b-ethylene oxide) (P4VP-PEO) to adsorb sulfamethoxazole (SMX) as an EOC model compound. We hypothesize that the adsorption of SMX was achieved mainly by π-π interactions between the pyridine functionalities of the block copolymer and the electron deficient phenyl group of the SMX. Preceding preparation of the films, CNFs were modified with the alkoxysilane trimethoxy(2-phenylethyl)silane (TMPES) to increase their stability in aqueous solution. After the addition of P4VP-PEO, the process was completed by filtration followed by oven-drying. XPS and FTIR were employed to confirm the addition of TMPES and P4VP-PEO, respectively. Adsorption batch experiments were performed in aqueous solutions of SMX at a neutral pH, obtaining adsorptions of up to 0.014 mmol/g in a moderate time of 60 min. For the reusability tests, films were immersed in ethanol 95 wt.% to elude the adsorbed SMX, rinsed with deionized (DI) water, and dried at room temperature to be reused in a new adsorption cycle. We found that this new composite material could be reused several times with negligible loss of adsorption capacity. The films presented have been shown to be of substantial importance for water remediation as they find direct application in the adsorption of electron deficient aromatic compounds and are reusable.

Food advertising on Argentinean television: are ultra-processed foods in the lead?

OBJECTIVE: To describe the number of processed and ultra-processed food (PUPF) advertisements (ads) targeted to children on Argentinean television (TV), to analyse the advertising techniques used and the nutritional quality of the foods advertised, and to determine the potential exposure of children to unhealthy food advertising in our country. DESIGN: Five free-to-air channels and the three most popular children's cable networks were recorded from 07.00 to 22.00 hours for 6 weeks. Ads were classified by target audience, type of product, advertised food categories and advertising strategies used. The NOVA system was used to classify food products according to industrial food processing level. Nutritional quality was analysed using the Pan American Health Organization's nutrient profile model. SETTING: Buenos Aires, Argentina. Results are considered applicable to most of the country. SUBJECTS: The study did not involve human subjects. RESULTS: Of the sample of food ads, PUPF products were more frequently advertised during children's programmes (98·9 %) v. programmes targeted to the general audience (93·7 %, χ 2=45·92, P<0·01). The top five food categories were desserts, dairy products, non-alcoholic sugary beverages, fast-food restaurants, and salty snacks. Special promotions and the appearance of cartoon characters were much more frequent in ads targeting children. Argentinean children are estimated to be exposed to sixty-one ads for unhealthy PUPF products per week. CONCLUSIONS: Our study showed that Argentinean children are exposed to a high number of unhealthy PUPF ads on TV. The Argentinean Government should build on this information to design and implement a comprehensive policy to reduce exposure to unhealthy food marketing that includes TV and other communication channels and places.

Spanish home enteral nutrition registry of the year 2014 and 2015 from the NADYA-SENPE Group / Registro del Grupo NADYA-SENPE de nutrición enteral domiciliaria en España, años 2014 y 2015.

Objective: To present the results of the Spanish home enteral nutrition (HEN) registry of the NADYA-SENPE group for the years 2014 and 2015. Methods: From January 1st 2014 to December 31st 2015 the HEN registry was recorded and afterwards a further descriptive and analytical analysis was done. Results: In 2014, 3749 patients were recorded, and 4202 in 2015; prevalence was 80.58 patients/one million inhabitants in Spain in 2014 and 90.51 in 2015. There were 49.9% females in 2014 and 50.3% in 2015. Median age was 73 years (IQI 59-83) in 2014 as well as in 2015. 684 episodes finished in 2014 and 631 in 2015, with death as the main cause, in 54.9% and 50.4%, respectively. The ones who were fed through nasogastric tube had a mean age higher than the ones fed by any other route (p-value < 0.001). Sisty-seven paediatric patients were recorded in 2014 (56.7% females) and 77 in 2015 (55.8% females). Median age at the beginning of HEN among children was 5 months in 2014 and 5 months in 2015. The main route of administration was gastrostomy, in 52.5% in 2014 and nasogastric tube in 50.8% in 2015. 7 episodes finished in 2014 and 13 in 2015, having death as the main cause (57.1% in 2014 and 38.5% in 2015). It was found that were younger children the ones who were mainly fed by nasogastric tubes (p-value 0.004 vs. 0.002). Among paediatric patients as well as adults, the main diagnosis leading to HEN was neurological disease which gives aphagia or severe dysphagia. Conclusions: There has been an increase in the number of patients in the registry as well as the participating centers and the number of patients per center, without any significant change in the characteristics of the patients other than longer duration of the episodes.

Objetivo: exponer los resultados del registro de nutrición enteral domiciliaria (NED) del año 2014 y 2015 del Grupo NADYA-SENPE. Métodos: se recopilaron los pacientes introducidos en el registro desde el 1 de enero al 31 de diciembre de 2014 y la mismas fechas de 2015, y se procedió al análisis descriptivo y analítico de los datos. Resultados: en el año 2014, se registraron 3.749 pacientes y en 2015, 4.202; la prevalencia fue de 80,58 pacientes/millón de habitantes en el año 2014 y de 90,51 en 2015. Por sexos, hubo un 49,9% de mujeres en 2014 y un 50,3% en 2015. La edad media fue de 73 años (IIQ 59-83) en ambos años. Finalizaron 684 episodios de NED en 2014 y 631 en 2015, la causa principal fue el fallecimiento en el 54,9% y 50,4% de los casos, respectivamente. Los portadores de sonda nasogástrica presentan una edad media superior a los pacientes con cualquier otra vía (p < 0,001). Se registraron 67 pacientes pediátricos en 2014 (56,7% niñas) y 77 en 2015 (55,8% niñas). La vía principal de administración fue la gastrostomía en el 52,0% de los casos de 2014 y sonda nasogástrica en el 50,8% de los casos de 2015. La causa principal de finalización de la nutrición fue el fallecimiento (57,1% en 2014 y 38,5% en 2015). Se observó que los niños más pequeños eran los que se alimentaban preferentemente por SNG (p 0,004 vs.0,002).Tanto en pacientes pediátricos como en adultos el diagnóstico principal que motivó la necesidad de NED fue la enfermedad neurológica que cursa con afagia o disfagia severa. Conclusiones: se ha incrementado el número de pacientes del registro, así como el número de centros participantes y el número medio de pacientes comunicados por cada centro respecto a años anteriores, sin que se hayan modificado sustancialmente las características de los pacientes, salvo mayor duración de los episodios.

Registro del Grupo NADYA-SENPE de nutrición enteral domiciliaria en España, años 2014 y 2015 / Spanish home enteral nutrition registry of the year 2014 and 2015 from the NADYA-SENPE Group

Objetivo: exponer los resultados del registro de nutrición enteral domiciliaria (NED) del año 2014 y 2015 del Grupo NADYA-SENPE. Métodos: se recopilaron los pacientes introducidos en el registro desde el 1 de enero al 31 de diciembre de 2014 y la mismas fechas de 2015, y se procedió al análisis descriptivo y analítico de los datos. Resultados: en el año 2014, se registraron 3.749 pacientes y en 2015, 4.202; la prevalencia fue de 80,58 pacientes/millón de habitantes en el año 2014 y de 90,51 en 2015. Por sexos, hubo un 49,9% de mujeres en 2014 y un 50,3% en 2015. La edad media fue de 73 años (IIQ 59-83) en ambos años. Finalizaron 684 episodios de NED en 2014 y 631 en 2015, la causa principal fue el fallecimiento en el 54,9% y 50,4% de los casos, respectivamente. Los portadores de sonda nasogástrica presentan una edad media superior a los pacientes con cualquier otra vía (p < 0,001). Se registraron 67 pacientes pediátricos en 2014 (56,7% niñas) y 77 en 2015 (55,8% niñas). La vía principal de administración fue la gastrostomía en el 52,0% de los casos de 2014 y sonda nasogástrica en el 50,8% de los casos de 2015. La causa principal de finalización de la nutrición fue el fallecimiento (57,1% en 2014 y 38,5% en 2015). Se observó que los niños más pequeños eran los que se alimentaban preferentemente por SNG (p 0,004 vs. 0,002).Tanto en pacientes pediátricos como en adultos el diagnóstico principal que motivó la necesidad de NED fue la enfermedad neurológica que cursa con afagia o disfagia severa. Conclusiones: se ha incrementado el número de pacientes del registro, así como el número de centros participantes y el número medio de pacientes comunicados por cada centro respecto a años anteriores, sin que se hayan modificado sustancialmente las características de los pacientes, salvo mayor duración de los episodios (AU)

Objective: To present the results of the Spanish home enteral nutrition (HEN) registry of the NADYA-SENPE group for the years 2014 and 2015. Methods: From January 1st 2014 to December 31st 2015 the HEN registry was recorded and afterwards a further descriptive and analytical analysis was done. Results: In 2014, 3749 patients were recorded, and 4202 in 2015; prevalence was 80.58 patients/one million inhabitants in Spain in 2014 and 90.51 in 2015. There were 49.9% females in 2014 and 50.3% in 2015. Median age was 73 years (IQI 59-83) in 2014 as well as in 2015. 684 episodes finished in 2014 and 631 in 2015, with death as the main cause, in 54.9% and 50.4%, respectively. The ones who were fed through nasogastric tube had a mean age higher than the ones fed by any other route (p-value < 0.001). Sixty-seven paediatric patients were recorded in 2014 (56.7% females) and 77 in 2015 (55.8% females). Median age at the beginning of HEN among children was 5 months in 2014 and 5 months in 2015. The main route of administration was gastrostomy, in 52.5% in 2014 and nasogastric tube in 50.8% in 2015. 7 episodes finished in 2014 and 13 in 2015, having death as the main cause (57.1% in 2014 and 38.5% in 2015). It was found that were younger children the ones who were mainly fed by nasogastric tubes (p-value 0.004 vs. 0.002). Among paediatric patients as well as adults, the main diagnosis leading to HEN was neurological disease which gives aphagia or severe dysphagia. Conclusions: There has been an increase in the number of patients in the registry as well as the participating centers and the number of patients per center, without any significant change in the characteristics of the patients other than longer duration of the episodes (AU)

Contenido de azúcares en bebidas no alcohólicas comercializadas en Argentina y Costa Rica / Sugar Content in Non-Alcoholic Beverages Marketed in Argentina and Costa Rica

INTRODUCCIÓN: El consumo de bebidas azucaradas está vinculado con un mayor riesgo de obesidad. OBJETIVOS: Comparar el contenido de azúcares declarado en el etiquetado nutricional de diferentes bebidas no alcohólicas comercializadas en Argentina y Costa Rica. MÉTODOS: Se recogieron datos de azúcares reportados en 13 categorías de bebidas no alcohólicas comercializadas en supermercados en 2012 y 2013. En ambos países se calculó la media de azúcares en una porción estándar de 200 ml. RESULTADOS: Dentro de las bebidas no alcohólicas comercializadas en Argentina (n=287) y Costa Rica (n=495) predominaron las azucaradas (77,6%), de las cuales la mayoría (56%; n=435) mostró contenidos de azúcares por encima del 20% del valor diario recomendado por la Organización Mundial de la Salud. Costa Rica presentó en promedio niveles superiores a los de Argentina. Las categorías con mayor contenido de azúcares en Costa Rica fueron: néctares (24,7 g/200 ml), jugos de fruta (22,5 g/200 ml) y gaseosas regulares (22,5 g/200 ml). En Argentina, gaseosas regulares (20,9 g/200 ml), jugos de fruta (18,5 g/200 ml) y bebidas a base de soja (14,9 g/200 ml). CONCLUSIONES: Este es el primer estudio que analiza y compara el contenido de azúcares de bebidas no alcohólicas en dos países latinoamericanos. El alto contenido observado y la elevada prevalencia de sobrepeso y obesidad en la región evidencian la necesidad de establecer políticas públicas para reducir el consumo de bebidas azucaradas.

INTRODUCTION: The consumption of sugar-sweetened beverages is associated with an increased risk of obesity. OBJECTIVES: To compare the sugar content on food labels of different non-alcoholic beverages marketed in Argentina and Costa Rica. METHODS: Sugar data were collected from 13 categories of non-alcoholic beverages available in supermarkets in 2012 and 2013. Mean sugar levels were calculated in both countries, considering a standard serving of 200 ml. RESULTS: Among non-alcoholic beverages available in Argentina (n=287) and Costa Rica (n=495), sugar-sweetened ones were predominant (77.6%). The majority of them (56%; n=435) had sugar contents that were over 20% of the daily intake recommended by the World Health Organization. Costa Rica showed average levels higher than Argentina. The categories with the highest sugar content in Costa Rica were nectars (24.7 g/200 ml), fruit juices (22.5 g/200 ml) and regular soft drinks (22.5 g/200 ml); in Argentina, regular soft drinks (20.9 g/200 ml), fruit juices (18.5 g/200 ml) and soy-based drinks (14.9 g/200 ml). CONCLUSIONS: This study is the first analysis and comparison of sugar content in non-alcoholic beverages in two Latin American countries. The high sugar content found in soft drinks and the high prevalence of overweight and obesity in the region show the need to implement public health policies to reduce consumption of sugar-sweetened beverages

Sodium content in processed foods in Argentina: compliance with the national law.

BACKGROUND: Despite the body of evidence that documents the unfavorable effects of excessive sodium consumption on blood pressure and cardiovascular health, public health efforts to decrease sodium consumption have been limited to a few countries. Argentina is the first country in Latin America to regulate sodium content of processed foods by means of a national law. The objective of this cross-sectional quantitative study is to provide a baseline comparison against the reduction targets set by the national law before its entry into force. METHODS: Data were collected in February 2014 in a leading supermarket chain located in Buenos Aires. Nutrient data from package labels were analysed for 1,320 products within 14 food groups during the study period. To compare sodium concentration levels with the established maximum levels we matched the collected food groups with the food groups included in the law resulting in a total of 292 products. Data analysis was conducted using SPSS version 20 software. RESULTS: Food groups with the highest median sodium content were sauces and spreads (866.7 mg/100 g), meat and meat products (750 mg/100 g) and snack foods (644 mg/100 g). Categories with the highest sodium content were appetizers (1,415 mg/100 g), sausages (1,050 mg/100 g) and ready-made meals (940.7 mg/100 g). We also found large variability within products from the same food categories. Products included in the national law correspond to 22.1% (n=292) of the surveyed foods. From the 18 food groups, 15 showed median sodium values below the established targets. Products exceeding the established maximum levels correspond to 15.1% (n=44) of the products included in the analysis. CONCLUSIONS: This study is the first analysis of food labels to determine sodium concentrations of processed foods in Argentina and to provide a baseline against the national law standards. Upon the completion of this analysis, maximum levels have been achieved by most of the food groups included in the law. Thus, the introduction of further reductions for the existing maximum levels and the establishment of sodium targets for all relevant product categories not included in the law should be considered as the next steps in the process.

Properties of a commercial PTW-60019 synthetic diamond detector for the dosimetry of small radiotherapy beams.

A CVD based radiation detector has recently become commercially available from the manufacturer PTW-Freiburg (Germany). This detector has a sensitive volume of 0.004 mm(3), a nominal sensitivity of 1 nC Gy(-1) and operates at 0 V. Unlike natural diamond based detectors, the CVD diamond detector reports a low dose rate dependence. The dosimetric properties investigated in this work were dose rate, angular dependence and detector sensitivity and linearity. Also, percentage depth dose, off-axis dose profiles and total scatter ratios were measured and compared against equivalent measurements performed with a stereotactic diode. A Monte Carlo simulation was carried out to estimate the CVD small beam correction factors for a 6 MV photon beam. The small beam correction factors were compared with those obtained from stereotactic diode and ionization chambers in the same irradiation conditions The experimental measurements were performed in 6 and 15 MV photon beams with the following square field sizes: 10 × 10, 5 × 5, 4 × 4, 3 × 3, 2 × 2, 1.5 × 1.5, 1 × 1 and 0.5 × 0.5 cm. The CVD detector showed an excellent signal stability (<0.2%) and linearity, negligible dose rate dependence (<0.2%) and lower response angular dependence. The percentage depth dose and off-axis dose profiles measurements were comparable (within 1%) to the measurements performed with ionization chamber and diode in both conventional and small radiotherapy beams. For the 0.5 × 0.5 cm, the measurements performed with the CVD detector showed a partial volume effect for all the dosimetric quantities measured. The Monte Carlo simulation showed that the small beam correction factors were close to unity (within 1.0%) for field sizes ≥1 cm. The synthetic diamond detector had high linearity, low angular and negligible dose rate dependence, and its response was energy independent within 1% for field sizes from 1.0 to 5.0 cm. This work provides new data showing the performance of the CVD detector compared against a high spatial resolution diode. It also presents a comparison of the CVD small beam correction factors with those of diode and ionization chamber for a 6 MV photon beam.

Prevalencia de sobrepeso, obesidad, actividad física y tabaquismo en adolescentes argentinos: Encuestas Mundiales de Salud Escolar y de Tabaco en Jóvenes, 2007-2012 / Prevalence of overweight, obesity, physical activity and tobacco use in Argentine youth: Global School-Based Student Health Survey and Global Youth Tobacco Survey, 2007-2012

Introducción. En 2007 y 2012, se implementaron en nuestro país las Encuestas Mundiales de Salud en Jóvenes (EMSE) y de Tabaco en Jóvenes (EMTJ) para estimar la prevalencia de comportamientos de riesgo y factores de protección entre los adolescentes de 13 a 15 años. Objetivo. Evaluar los cambios de los indicadores de alimentación y peso corporal, tabaco y actividad física en los últimos 5 años. Metodología. Estudio de corte transversal. Se utilizó un muestreo aleatorizado bietápico con selección de 600 escuelas a nivel nacional. Los estudiantes de las divisiones elegidas al azar fueron invitados a responder el cuestionario autoadministrado (de la EMSE o de la EMTJ). Resultados. En 2012, la encuesta fue respondida por 20 697 alumnos de 544 escuelas para la EMSE y 2062 para la EMTJ en 73 escuelas. Entre 2007 y 2012, se incrementó en forma significativa la prevalencia de sobrepeso (24,5% en 2007, 28,6% en 2012) y obesidad (4,4% en 2007, 5,9% en 2012), y se mantuvieron elevados los consumos de bebidas azucaradas y comidas rápidas. Se observó una leve mejora en el nivel de actividad física (12,7% en 2007, 16,7% en 2012) aunque continúa por debajo de lo recomendado. Se redujo la prevalencia de tabaquismo (24,5% en 2007, 19,6% en 2012), pero persiste elevado el acceso a productos del tabaco y la exposición al humo de tabaco ajeno en lugares públicos, incluso la escuela. Conclusiones. La progresión de la epidemia de sobrepeso y obesidad indica una necesidad de profundizar acciones en alimentación saludable y actividad física. A pesar del descenso de la prevalencia de tabaquismo, es necesario seguir fortaleciendo las acciones de control de tabaco.

Introduction. In2007and 2012, the Global School-Based Student Health Survey (GSHS) and the Global Youth Tobacco Survey (GYTS) were implemented to estimate the prevalence of risk behaviors and protection factors among 13 to 15 year-old adolescents. Objective. To assess changes in dietary, body weight, tobacco and physical activity indicators in the past five years. Population and Methos. Cross-sectional study. A randomized, two-stage sampling with 600 schools selected at a national level was used. Students from randomly selected courses were invited to answer a self-administered questionnaire (either the GSHS or the GYTS). Results. In 2012, the GSHS was completed by 20 697 students from 544 schools, while the GYTS was completed by 2062 students from 73 schools. Between 2007 and 2012, overweight and obesity prevalence significantly increased (overweight: 24.5% in2007, 28.6% in2012; obesity 4.4% in2007, 5.9% in 2012), while the consumption of sugar-sweetened beverages and fast food remained high. A slight improvement was observed in the level of physical activity (12.7% in 2007, 16.7% in 2012), although it remains below what is recommended. The prevalence of tobacco use was reduced (24.5% in 2007, 19.6% in 2012), but access to tobacco products and exposure to secondhand smoke remains high in public places, including schools. Conclusions. The spread of the overweight and obesity epidemic calls for a need to consolidate actions tending towards a healthy diet and physical activity. Despite a decrease in the prevalence of tobacco use, it is necessary to continue strengthening tobacco control actions.

Prevalencia de sobrepeso, obesidad, actividad física y tabaquismo en adolescentes argentinos: Encuestas Mundiales de Salud Escolar y de Tabaco en Jóvenes, 2007-2012 / Prevalence of overweight, obesity, physical activity and tobacco use in Argentine youth: Global School-Based Student Health Survey and Global Youth Tobacco Survey, 2007-2012

Introducción. En 2007 y 2012, se implementaron en nuestro país las Encuestas Mundiales de Salud en Jóvenes (EMSE) y de Tabaco en Jóvenes (EMTJ) para estimar la prevalencia de comportamientos de riesgo y factores de protección entre los adolescentes de 13 a 15 años. Objetivo. Evaluar los cambios de los indicadores de alimentación y peso corporal, tabaco y actividad física en los últimos 5 años. Metodología. Estudio de corte transversal. Se utilizó un muestreo aleatorizado bietápico con selección de 600 escuelas a nivel nacional. Los estudiantes de las divisiones elegidas al azar fueron invitados a responder el cuestionario autoadministrado (de la EMSE o de la EMTJ). Resultados. En 2012, la encuesta fue respondida por 20 697 alumnos de 544 escuelas para la EMSE y 2062 para la EMTJ en 73 escuelas. Entre 2007 y 2012, se incrementó en forma significativa la prevalencia de sobrepeso (24,5% en 2007, 28,6% en 2012) y obesidad (4,4% en 2007, 5,9% en 2012), y se mantuvieron elevados los consumos de bebidas azucaradas y comidas rápidas. Se observó una leve mejora en el nivel de actividad física (12,7% en 2007, 16,7% en 2012) aunque continúa por debajo de lo recomendado. Se redujo la prevalencia de tabaquismo (24,5% en 2007, 19,6% en 2012), pero persiste elevado el acceso a productos del tabaco y la exposición al humo de tabaco ajeno en lugares públicos, incluso la escuela. Conclusiones. La progresión de la epidemia de sobrepeso y obesidad indica una necesidad de profundizar acciones en alimentación saludable y actividad física. A pesar del descenso de la prevalencia de tabaquismo, es necesario seguir fortaleciendo las acciones de control de tabaco.(AU)

Introduction. In2007and 2012, the Global School-Based Student Health Survey (GSHS) and the Global Youth Tobacco Survey (GYTS) were implemented to estimate the prevalence of risk behaviors and protection factors among 13 to 15 year-old adolescents. Objective. To assess changes in dietary, body weight, tobacco and physical activity indicators in the past five years. Population and Methos. Cross-sectional study. A randomized, two-stage sampling with 600 schools selected at a national level was used. Students from randomly selected courses were invited to answer a self-administered questionnaire (either the GSHS or the GYTS). Results. In 2012, the GSHS was completed by 20 697 students from 544 schools, while the GYTS was completed by 2062 students from 73 schools. Between 2007 and 2012, overweight and obesity prevalence significantly increased (overweight: 24.5% in2007, 28.6% in2012; obesity 4.4% in2007, 5.9% in 2012), while the consumption of sugar-sweetened beverages and fast food remained high. A slight improvement was observed in the level of physical activity (12.7% in 2007, 16.7% in 2012), although it remains below what is recommended. The prevalence of tobacco use was reduced (24.5% in 2007, 19.6% in 2012), but access to tobacco products and exposure to secondhand smoke remains high in public places, including schools. Conclusions. The spread of the overweight and obesity epidemic calls for a need to consolidate actions tending towards a healthy diet and physical activity. Despite a decrease in the prevalence of tobacco use, it is necessary to continue strengthening tobacco control actions.(AU)

Prevalence of overweight, obesity, physical activity and tobacco use in Argentine youth: Global School-Based Student Health Survey and Global Youth Tobacco Survey, 2007-2012.

INTRODUCTION: In 2007 and 2012, the Global School-Based Student Health Survey (GSHS) and the Global Youth Tobacco Survey (GYTS) were implemented to estimate the prevalence of risk behaviors and protection factors among 13 to 15 year-old adolescents. OBJECTIVE: To assess changes in dietary, body weight, tobacco and physical activity indicators in the past five years. POPULATION AND METHODS: Cross-sectional study. A randomized, two-stage sampling with 600 schools selected at a national level was used. Students from randomly selected courses were invited to answer a self-administered questionnaire (either the GSHS or the GYTS). RESULTS: In 2012, the GSHS was completed by 20 697 students from 544 schools, while the GYTS was completed by 2062 students from 73 schools. Between 2007 and 2012, overweight and obesity prevalence significantly increased (overweight: 24.5% in 2007, 28.6% in 2012; obesity 4.4% in 2007, 5.9% in 2012), while the consumption of sugar-sweetened beverages and fast food remained high. A slight improvement was observed in the level of physical activity (12.7% in 2007, 16.7% in 2012), although it remains below what is recommended. The prevalence of tobacco use was reduced (24.5% in 2007, 19.6% in 2012), but access to tobacco products and exposure to secondhand smoke remains high in public places, including schools. CONCLUSIONS: The spread of the overweight and obesity epidemic calls for a need to consolidate actions tending towards a healthy diet and physical activity. Despite a decrease in the prevalence of tobacco use, it is necessary to continue strengthening tobacco control actions.

Prevalence of overweight, obesity, physical activity and tobacco use in Argentine youth: Global School-Based Student Health Survey and Global Youth Tobacco Survey, 2007-2012. / Prevalence of overweight, obesity, physical activity and tobacco use in Argentine youth: Global School-Based Student Health Survey and Global Youth Tobacco Survey, 2007-2012.

INTRODUCTION: In 2007 and 2012, the Global School-Based Student Health Survey (GSHS) and the Global Youth Tobacco Survey (GYTS) were implemented to estimate the prevalence of risk behaviors and protection factors among 13 to 15 year-old adolescents. OBJECTIVE: To assess changes in dietary, body weight, tobacco and physical activity indicators in the past five years. POPULATION AND METHODS: Cross-sectional study. A randomized, two-stage sampling with 600 schools selected at a national level was used. Students from randomly selected courses were invited to answer a self-administered questionnaire (either the GSHS or the GYTS). RESULTS: In 2012, the GSHS was completed by 20 697 students from 544 schools, while the GYTS was completed by 2062 students from 73 schools. Between 2007 and 2012, overweight and obesity prevalence significantly increased (overweight: 24.5

in 2007, 28.6

in 2012; obesity 4.4

in 2007, 5.9

in 2012), while the consumption of sugar-sweetened beverages and fast food remained high. A slight improvement was observed in the level of physical activity (12.7

in 2007, 16.7

in 2012), although it remains below what is recommended. The prevalence of tobacco use was reduced (24.5

in 2007, 19.6

in 2012), but access to tobacco products and exposure to secondhand smoke remains high in public places, including schools. CONCLUSIONS: The spread of the overweight and obesity epidemic calls for a need to consolidate actions tending towards a healthy diet and physical activity. Despite a decrease in the prevalence of tobacco use, it is necessary to continue strengthening tobacco control actions.

Dosimetry for small fields in stereotactic radiosurgery using gafchromic MD-V2-55 film, TLD-100 and alanine dosimeters.

This work investigated the suitability of passive dosimeters for reference dosimetry in small fields with acceptable accuracy. Absorbed dose to water rate was determined in nine small radiation fields with diameters between 4 and 35 mm in a Leksell Gamma Knife (LGK) and a modified linear accelerator (linac) for stereotactic radiosurgery treatments. Measurements were made using Gafchromic film (MD-V2-55), alanine and thermoluminescent (TLD-100) dosimeters and compared with conventional dosimetry systems. Detectors were calibrated in terms of absorbed dose to water in (60)Co gamma-ray and 6 MV x-ray reference (10×10 cm(2)) fields using an ionization chamber calibrated at a standards laboratory. Absorbed dose to water rate computed with MD-V2-55 was higher than that obtained with the others dosimeters, possibly due to a smaller volume averaging effect. Ratio between the dose-rates determined with each dosimeter and those obtained with the film was evaluated for both treatment modalities. For the LGK, the ratio decreased as the dosimeter size increased and remained constant for collimator diameters larger than 8 mm. The same behaviour was observed for the linac and the ratio increased with field size, independent of the dosimeter used. These behaviours could be explained as an averaging volume effect due to dose gradient and lack of electronic equilibrium. Evaluation of the output factors for the LGK collimators indicated that, even when agreement was observed between Monte Carlo simulation and measurements with different dosimeters, this does not warrant that the absorbed dose to water rate in the field was properly known and thus, investigation of the reference dosimetry should be an important issue. These results indicated that alanine dosimeter provides a high degree of accuracy but cannot be used in fields smaller than 20 mm diameter. Gafchromic film can be considered as a suitable methodology for reference dosimetry. TLD dosimeters are not appropriate in fields smaller than 10 mm diameters.

Estradiol worsens the syndrome of ischemia-reperfusion injury in an experimental lung transplantation model.

Ischemia-reperfusion injury (IRI) is a common complication after lung transplantation. There is evidence that reactive oxygen species are involved in its pathogenesis. We designed an experimental study to evaluate whether the administration of antioxidants to lung transplantation recipients protects against IRI and early acute rejection (AR). Twenty-five rats received left lung transplants after 6 h of ischemia. Fifty minutes before the reperfusion, groups of five rats received a single dose of desferrioxamine (20 mg/kg), estradiol (25 mg/kg), or melatonin (10 mg/kg). The animals were killed 48 h after surgery and the postoperative outcome, IRI, and AR were evaluated. The frequency of severe injury and of moderate-to-severe edema was higher in animals treated with estradiol than in the control group (P = 0.022 and P = 0.026, respectively). No significant changes in the degree of IRI or AR were observed in the groups treated with desferrioxamine or melatonin. In our study, treatment with the antioxidants melatonin or desferrioxamine before reperfusion had no effects on IRI damage or on AR frequency or severity. However, treatment with estradiol resulted in a worse postoperative outcome and in severe edema. Therefore, despite the antioxidant capacity of estradiol, it is recommended that an evaluation of these adverse effects of estradiol in human lung transplant recipients be performed.

Estudio descriptivo de la patología abdominal quirúrgica en pacientes de 0-14 años en el hospital de Apoyo Santa Rosa de Puerto Maldonado: 1990-1997

Se realizó un estudio retrospectivo de la patología abdominal quirúrgica en pacientes de 0-14 años de Apoyo Santa Rosa de puerto Maldonado entre los años 1990-1997, obteniendo 184 casos, el sexo más afectado fue el masculino 67.39 por ciento, y el grupo de edad lo representa el niño mayor con 65.76 por ciento. La patología más frecuente fue la apendicítis agudas con 63.04 por ciento encontrando relación entre el cuadro etiológico y la edad del paciente, en el recién nacido y el lactante se presento la hipertrofía benigna de píloro y la enterocolítis necrotizante en el preescolar y niño mayor la apendicítis aguda, las hernias inguinales y las hernias umbilicales. El tiempo de enfermedad que presentaron los pacientes que fue mayor de 2 días. Le corresponde el 77.77 por ciento a las operaciones electivas realizadas lo que esta realcionado con el tiempo transcurrido entre la referencia al hospital y sala de operaciones. Los síntomas y signos de alarma en la patología abdominal quirúrgica varian según la edad, por ejemplo en el recién nacido y lactante fue al distención abdominal las nauseas y vómitos, en el preescolar el dolor abdominal, nauseas, vómitos, diarrea y estreñimiento, en el niño mayor el dolor abdominal, nauseas, vómitos y la fiebre. Siendo las operaciones más frecuentes las apendisectomías y las hernioplastías. Se encontro una o más enfermedades concomitantes en el mismo paciente como la multiparasitosis (55.51 por ciento) deshidratación, desnutrición y sepsis. La complicación más frecuente fue la infección de herida operatoria. Encontramos una mortalidad del 10.87 por ciento correspondiendo al sexo masculino la mayor frecuencia, el grupo de edad más afectado fue el preescolar porque en ellos se encuentró enfermedades propias del lugar como la parasitosis, la TBC enteroperitoneal y los traumatismos abdominales. La causa de muerte más frecuente fue la sepsis 75 por ciento la mortalidad producida por las intervenciones quirúrgicas fue del 10.87 por ciento y el porcentaje de mortalidad presentada por patología abdominal quirúrgica respecto a las otras causas de muerte fue el de 16.26 por ciento