Sample records for chemistry water
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1

Medicamentos de consumo humano en el agua, propiedades físico-químicas/ Physic-chemical properties of human consumption drugs in water

Ramos Alvariño, Caridad
2009-08-01

Resumen en español En los años más recientes se reconoce que los compuestos farmacéuticos activos en el ambiente acuático, constituyen uno de los eventos emergentes en la química ambiental, originados por la disposición de las aguas residuales municipales, hospitalarias y de producción, tratadas o no. Su presencia crea resistencia antibiótica, afectan los procesos biológicos de tratamiento y sobrepasan las etapas de potabilización, etc. El objetivo del trabajo es abordar los aspec (mas) tos relacionados con la presencia de residuos de un grupo de medicamentos de consumo humano en el agua, su cuantificación y características físico-químicas, reportados por diversos autores en la última década, problema que aborda la contaminación que provocan estos compuestos y la necesidad de su estudio. Las características físico-químicas del grupo de medicamentos se obtuvieron consultando diferentes bases de datos y del estudio de más de 100 artículos científicos sobre el tema. Se evidenció su detección en el agua, se reporta la concentración en el agua del grupo de medicamentos seleccionados y sus características físico-químicas. Se reconoce que estos compuestos potencialmente se transportan de forma mayoritaria en los sistemas acuíferos. Se requiere profundizar más en el tema. Resumen en inglés In recent past years it is recognized that the active pharmaceutical compounds in aquatic environment are one the emerging events in environmental chemistry, originated by disposition of the municipal, sewage, from hospitals and for production waters treated or not. Its presence originates an antibiotic resistance, affecting the treatment biological processes and exceeding the fitness for drinking, etc. The aim of present paper is to approach the features related to prese (mas) nce of wastes from human-consumption drugs present in water, its quantification and the physic-chemical characteristic, reported by many authors in past decade, it is a problem approaching the contamination provoking these compounds and the need of its study. Physic-chemical characteristic of drugs group were obtained consulting different databases and from study of more than 100 scientific articles on this matter. Its detection in water was demonstrated, concentration in water of the drugs selected and its physic-chemical characteristic was reported. It is recognized that these compounds potentially are carried in a majority was in aquiferous systems. We must to make a study in depth on this matter.

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2

Datos analíticos de la goma de la semilla de Leucaena leucocephala/ Analytical data of seed gum from Leucaena leucocephala

Abed El Kader, D; Molina, E. A; Montero, K. C; Gutierrez, O; Troncone, G; León de Pinto, G
2008-03-01

Resumen en español Las semillas de Leucaena leucocephala (Lam.), contiene goma muy soluble en agua. Se determinaron los contenidos de ceniza, materia seca, fibra dietética, fibra cruda, proteína, taninos, la composición de azúcares y aminoácidos. Se usaron métodos analíticos clásicos para la caracterización de la goma, cromatografía liquida de alta resolución (HPLC), análisis proximal y espectroscopia de absorción atómica. La goma contiene manosa y galactosa. Se demostró la p (mas) resencia de aminoácidos esenciales y no esenciales con excepción de la cisteina. La composición mineral de la ceniza de la goma mostró predominantemente la presencia de calcio, magnesio, sodio y potasio. El contenido de fibra dietética es menor que aquéllos reportados para algunas gomas comerciales. Los datos analíticos sugieren que la goma de semilla de L. leucocephala tiene potencial aplicación en las industrias de textil, química y pintura. Resumen en inglés Seeds from Leucaena leucocephala (Lam.) contain gum very soluble in water. Ash, dry matter, dietetic fiber, crude fiber, protein, tannin, sugar contents and amino acids composition were determined. Classic analytical methods like high performance liquid chromatography (HPLC), proximate analysis and atomic absorption spectroscopy were used for gum characterization. Gum contains mannose and galactose. Presence of essential and no essential amino acids -with the exception of (mas) cysteine- was demonstrated. The mineral composition of ash showed calcium, magnesium, sodium and potassium predominantly. The dietetic fiber content is lower than those reported for some commercial gums. The analytical data suggest that L. leucocephala gum has a potential application in textile, chemistry and painting industries.

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3

La Tierra vista como exoplaneta/ Earth as an exoplanet

Segura, Antígona
2010-08-01

Resumen en español La Tierra, como único ejemplo de planeta habitable, nos da los primeros elementos para caracterizar el espectro de planetas de tipo terrestre alrededor de otras estrellas que podrían ser detectados en el transcurso de la próxima década gracias a misiones como CoRoT y Kepler y caracterizados por las misiones Terrestrial Planet Finder y Darwin. En este artículo se compendian los estudios que utilizan a la Tierra para determinar las posibles características de mundos h (mas) abitables alrededor de otras estrellas. A partir de comparar las características de la Tierra con las de los demás planetas terrestres del Sistema Solar se ha determinado que, en principio, un planeta habitable debe tener atmósfera, agua líquida y el tamaño adecuado para retener dicha atmósfera y mantener actividad tectónica por periodos de tiempo geológicamente largos. Un planeta habitado podría ser reconocido como tal a partir de la detección de bioseñales en su espectro. Simulaciones de atmósferas similares a la Tierra presente y pasada, así como el conocimiento de la evolución geológica de nuestro planeta indican que el oxígeno (O2) resulta una excelente señal de vida, en especial si está acompañado de compuestos como el metano o el óxido nitroso. Los pigmentos usados por organismos fotosintéticos también pueden generar una señal en el espectro de un planeta, la cual sería similar a la absorción de la clorofila en la Tierra. Las observaciones del brillo de la Tierra permiten analizar el espectro promediado del disco de nuestro planeta y determinar los cambios de las bioseñales dadas diferentes condiciones de iluminación y geometría. A partir de estas observaciones y modelos que generan espectros promediados del disco terrestre, se ha encontrado que la presencia de nubes en una atmósfera es el mayor reto para reconocer bioseñales y, en general, las características de la superficie planetaria. La concentración atmosférica de los compuestos producidos por la vida depende de la cantidad de radiación ultravioleta que recibe el planeta, pues ésta controla buena parte de la química atmosférica. Esta radiación depende del tipo de estrella alrededor de la cual gira el planeta. La caracterización de planetas de tipo terrestre requiere conocer las propiedades de la estrella alrededor de la cual se buscan planetas (edad, temperatura superficial, radiación emitida del ultravioleta al infrarrojo), así como construir bibliotecas de espectros planetarios que permitan reconocer los mundos habitables de los que no lo son. Resumen en inglés Earth, as the only example of a habitable world, offers thefirst elements to characterize the spectra ofterrestrial planets around other stars. Those planets may be detected in the next decade by missions like CoRoT and Kepler, and characterized by Terrestrial Planet finder and Darwin. In this paper, I reviewed the research that uses Earth to determine the possible characteristics of habitable worlds around other stars. Comparing Earth's characteristics with those of the (mas) terrestrial planets in the Solar System, the main properties of a habitable world have been determined. A habitable planet must have atmosphere, liquid water and the right size to keep that atmosphere and to maintain tectonic activity for long geologic periods. A habitable world could be recognized as such by the detection of biosignatures on its spectrum. Simulations ofpast and present Earth-like atmospheres and the knowledge of the geological evolution of our planet indicate that oxygen (O2) is an excellent signature of life, in particular if it comes along with compounds like methane and nitrous oxide. Also, the pigments used by photosynthetic organisms could generate a signature in a planet's spectrum. This signature may be similar to the chlorophyll absorption on Earth. Earthshine observations help to analyze the disk average spectrum of our planet and to determine the changes of the biosignatures given certain conditions of illumination and geometry. From such observations and models that generate disk averaged spectra of Earth it has been found that clouds are the biggest challenge to identify biosignatures and characteristics of the planetary surface in general. The atmospheric abundance of the compounds produced by life depends on the amount ofultraviolet radiation received by the planet as it drives most of the atmospheric chemistry. This radiation depends on the stellar type of the planet's parent star. The characterization of terrestrial planets requires the knowledge of the target star properties (age, effective temperature, radiation emitted from the ultraviolet to the infrared), as well as to build spectra libraries that allow recognizing habitable worlds from those that are not.

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4

CORDIERITA 2MgO.2A12 O3 .5SiO2 SINTETIZADA POR LA RUTA DE LOS HIDROXIGELES/ CORDIERITE 2MgO. 2A12 O3. 5SiO2 SYNTHETIZED BY HYDROXYHYDROGEL ROUTE

PAUCAR ÁLVAREZ, CARLOS G.; DÍAZ GARZÓN, ANA I.; RIBERO RODRÍGUEZ, DANIEL; QUINTERO ALVAREZ, KATERINE; GARCÍA GARCÍA, CLAUDIA P.
2009-11-01

Resumen en español Los materiales basados en cordierita 2MgO 2Al 2 O 3 5SiO 2 son utilizados comúnmente en refractarios y procesos catalíticos a temperaturas superiores a los 500 grados Celsius; dichas aplicaciones requieren de alta resistencia al choque térmico, bajo coeficiente de expansión térmica, alta resistencia a la acción corrosiva de los gases, baja constante dieléctrica y buenas propiedades mecánicas. En el presente trabajo, se reporta la síntesis y caracterización (mas) de cordierita a partir de hidrogeles por la ruta de química coloidal de hidroxihidrogeles. Las materias primas fueron dispersadas mecánicamente en un equipo de alta cizalla del tipo rotor stator, allí mismo se llevó a cabo el proceso de gelación. Los polvos obtenidos en la etapa de secado fueron sinterizados mediante variaciones de tiempo y temperaturas: 1200, 1300 y 1350 grados Celsius. Se conformaron monolitos de cordierita y se caracterizaron mediante análisis microquímico, análisis térmico diferencial (DTA), difracción de rayos X (XRD), microscopía electrónica de barrido (SEM) y medidas de absorción de agua. En este estudio se disminuyeron las temperaturas de cristalización de la cordierita 2MgO 2A12 O3 5SiO2 la cual se produce hasta 1200 grados Celsius; bajo los procesos de sinterización se generan monolitos con una baja porosidad en función de la temperatura hasta los 1350 grados Celsius. Resumen en inglés Materials based on cordierite 2MgO 2A12 O3 5SiO2 are used for refractoriness and catalytic processes at temperatures above 500 Celsius degrees where high thermal shock resistance, low thermal expansion coefficient, high resistance to corrosion gas, low dielectric constant and good mechanical properties are required. In the present work, the synthesis of cordierite by a colloidal chemistry route forming hydroxyhydrogels is reported, which were dispersed mechanically with a (mas) rotor stator. The powders obtained were sintered with variation of time at 1200, 1300 and 1350 Celsius degrees. The monoliths were characterized by microchemical analysis, differential thermal analysis (DTA), Xray diffraction (XRD), scanning electronic microscopy (SEM) and water absorption measurements. In this study the temperature of crystallization of cordierite of cordierite 2MgO 2A12 O3 5SiO2 was lowered which occurs at about 1200 degrees Celsius, and monoliths with low porosity were generated by sintering processes as a function of temperature, up to the 1350 degrees Celsius.

Scientific Electronic Library Online (Spanish)

5

Inventario de la Tortuga Arrau, Podocnemis expansa (Schweigger, 1812) en Zoológicos de Venezuela.: Valores Referenciales del Hemograma y la Bioquímica Sérica./ Inventory of the Arrau Sideneck Turtle, Podocnemis expansa (Schweigger, 1812) in Venezuelan Zoos.: Haematology and Blood Chemistry Reference Values.

Martínez, Enrique O; Hernández, Omar E; Boede, Ernesto O; Peñaloza, Claudia; Rodríguez, Alberto E
2007-10-01

Resumen en español La tortuga arrau o tortuga gigante del río Orinoco (Podocnemis expansa), es el quelonio de agua dulce de caparazón duro más grande del mundo, el cual ha sido sometido a una cacería irracional al punto de estar en peligro crítico de extinción. Entre las diversas estrategias de conservación para esta especie se ha considerado la posibilidad de incluir a algunos zoológicos de Venezuela dentro del programa de conservación ex situ, bien sea logrando la reproducción d (mas) e adultos que permanecen cautivos o participando en el levante de neonatos provenientes de áreas naturales para su posterior liberación. En tal sentido se realizó un inventario de los ejemplares existentes en los zoológicos, verificándose la presencia de 101 adultos (94 hembras y 7 machos). Se pudo apreciar que las exhibiciones donde son mantenidos no están diseñadas específicamente para esta especie, requiriendo la mayoría de modificaciones en su infraestructura y el manejo de los ejemplares, para que puedan servir como centros de reproducción ex situ. Se extrajeron muestras de sangre de tortugas de la nuca para ser analizadas en el laboratorio, con la finalidad de obtener valores hematológicos y de química sanguínea de referencia, como un paso esencial para estimar su estado de salud. Los resultados arrojados por la observación bajo el microscopio y un analizador automático de sangre fueron: hematocrito 34,30%, eritrocitos 470 x 10(9)/L, leucocitos 3,08 x 10(9)/L, linfocitos 34,00%, monocitos 1,33%, heterófilos 63,50%, proteínas totales 43,7 g/L, albúmina 19,2 g/L, globulinas 19,6 g/L, bilirrubina total 0,004 g/L, bilirrubina directa 0,001 g/L, ácido úrico 0,012 g/L, urea 0,366 g/L, glucosa 0,485 mg/L, hierro 1,088, mg/L, calcio 0,093 g/L, sodio 134,78 mmol/L, potasio 4,26 mmol/L, cloro 104,38 mmol/L, fósforo 0,033 g/L, CK 1673 u/L, AST 26,50 u/L, ALT 16,80 u/L, y ALP 154,60 u/L, respectivamente. Resumen en inglés The Arrau sideneck turtle (Podocnemis expansa) is the biggest fresh water hard shell chelonian of the world, which has been subjected to an irrational hunting to the point of being in the verge of extinction. Among the diverse strategies of conservation of this species, it has been considered the possibility to employ the zoos that kept this species in their collections as ex situ breeding centers, and also for raising wild born hatchlings until one year of age for re-int (mas) roduction purposes. In such a sense it was carried out an inventory of the captive zoo specimens where we counted 101 adult animals (94 females and 7 males). The inspection of the exhibits gave as a result that most of the facilities requires modifications, also in habitat conditions, animal husbandry, research and public information in order to reach mentioned aims. Blood samples were collected from the neck of some turtles, with the purpose to obtain hematological and blood chemistry reference values, as an essential step to estimate its health condition. The results obtained by the observation under microscope and a blood automatic analizer were: packed cell volume 34.30%, erythrocytes 470 x 10(9)/L, leukocytes 3.08 x 10(9)/L, lymphocytes 34.00%, monocytes 1.33%, heterophils 63.50%, total proteins 43.7 g/L, albumin 19.2 g/L, globulins 19.6 g/L, total bilirubine 0.004 g/L, direct bilirubin 0.001 g/L, uric acid 0.012 g/L, urea nitrogen 0.366 g/L, glucose 0.485 mg/L, iron 1.088, mg/L, calcium 0.093 g/L, sodium 134.78 mmol/L, potassium 4.26 mmol/L, chloride 104.38 mmol/L, phosphorus 0.033 g/L, CK 1673 u/L, AST 26.50 u/L, ALT (6.80 u/, and ALP 154.60 u/L),respectively.

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6

Variaciones longitudinales y temporales en la hidroquímica del río Duero/ Longitudinal and temporal hydrochemical variations in the Duero river

Velázquez-Machuca, Martha A.; Pimentel-Equihua, José L.; Ortega-Escobar, Manuel
2010-08-01

Resumen en español El río Duero drena una cuenca de 3 512 km en el noroeste del estado de Michoacán y recibe las aguas residuales generadas por unos 400 mil habitantes y drenajes agrícolas de 20 mil ha, lo que genera un potencial problema de contaminación. Con el objetivo de determinar las variaciones longitudinales y temporales en la hidroquímica del Duero y los factores relacionados, se realizaron análisis físico-químicos (pH, CE, Ca2+, Mg2+, Na+, K+, (mas) ./../img/revistas/agro/v44n5/a9s1.jpg">, Cl-, , P) en muestras de agua en cuatro y dos (Pb, Cu, Fe, Mn, Zn) fechas de muestreo durante 2006 y 2007 en 12 sitios de la corriente. Las aguas fueron de composición mixta-bicarbonatada y sódico-bicarbonatada, del tipo C1S1 y C2S1, clasificándose como eutrofizadas por su concentración de P. Por concentración de contaminantes, el río mostró dos tramos diferenciados: Carapan-Las Adjuntas y Los Espinos-Ibarra, resultado de la intensidad de las actividades antrópicas sobre la corriente. La concentración media de Pb, Cu, Fe, Mn y Zn fue 52.7, 37.3, 14.2, 24.9 y 16.0 µg L-1. Los factores asociados con la química del agua fueron: 1) precipitación-caudales del río; 2) drenajes domésticos; 3) drenajes agrícolas; 4) intemperismo de las rocas carbonatadas; 5) intemperismo de rocas basálticas. Resumen en inglés The Duero river drains a basin of 3 512 km in the northwest of the state of Michoacán and receives wastewater from about 400 thousand inhabitants and agricultural drainage of 20 000 ha, thus creating a potential contamination problem. In order to determine the longitudinal and temporary variations in the Duero hydrochemistry and related factors, physical-chemical analyses (pH, CE, Ca2+, Mg2+, Na+, K+, , (mas) Cl-, , P) were carried out in water samples in four and two (Pb, Cu, Fe, Mn, Zn) sampling dates during 2006 and 2007 in 12 sites of the current. The river waters were of mixed-bicarbonate and sodium-bicarbonate composition, of the type C1S1 and C2S1, ranking as eutrophic for their concentration of phosphorus. Due to the concentration of contaminants, the river exhibited two different sections: Carapan-Las Adjuntas and Los Espinos-Ibarra, as a result of intense human activity on the stream. The average concentration of Pb, Cu, Fe, Mn and Zn were 52.7, 37.3, 14.2, 24.9 and 16.0 µg L-1. The factors associated with water chemistry were: 1) rainfall-river flow; 2) domestic drainage; 3) agricultural drainage; 4) weathering of carbonate rocks; 5) weathering of basaltic rocks.

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7

Aproximación multimétrica a la evaluación de la calidad del agua en cuencas con diferentes niveles de intervención antrópica/ Multimetric approach to water quality evaluation of basins with diferent levels of antropic perturbation/ Aproximação multimétrica à avaliação da qualidade da agua em bacias com diferentes níveis de intervenção antrópica

Mancilla, Gabriela; Valdovinos, Claudio; Azócar, Marysol; Henríquez, Mariel; Figueroa, Ricardo
2009-12-01

Resumen en portugués A vegetação riberenha desempenha um conjunto de funções ecossistêmicas. Tem influência sobre a hidrologia, geomorfologia, química da água e subministro de material alóctono, pelo qual é relevante na produtividade e funcionamento, estabilizando ladeiras, regulando a temperatura, filtrando e retendo nutrientes e outorgando habitat às comunidades aquáticas. Este estudo realizou uma aproximação multiparamétrica em rios mediterrâneos do Chile central. Os result (mas) ados mostraram que as variáveis que melhor refletem a distribuição dos macroinvertebrados foram a condutividade e os sólidos dissolvidos, as quais também se correlacionaram significativamente com a qualidade de ribeira e do habitat fluvial. Esta aproximação sugere a avaliação integral do sistema fluvial como uma ferramenta para a conservação e restauração da saúde integral dos ecossistemas aquáticos. Resumen en español La vegetación ribereña desempeña un conjunto de funciones ecosistémicas. Tiene influencia sobre la hidrología, geomorfología, química del agua y suministro de material alóctono, por lo cual es relevante en la productividad y funcionamiento, estabilizando laderas, regulando la temperatura, filtrando y reteniendo nutrientes y otorgando hábitat a las comunidades acuáticas. Este estudio realizó una aproximación multiparamétrica en ríos mediterráneos de Chile ce (mas) ntral. Los resultados mostraron que las variables que mejor reflejan la distribución de los macroinvertebrados fueron la conductividad y los sólidos disueltos, las cuales también se correlacionaron significativamente con la calidad de ribera y del hábitat fluvial. Esta aproximación sugiere la evaluación integral del sistema fluvial como una herramienta para la conservación y restauración de la salud integral de los ecosistemas acuáticos. Resumen en inglés The riparian zone vegetation performs several functions for the ecosystem. It influences the hydrology, geomorphology, water chemistry; and supplies of allocthonous materials; therefore, it is important for the productivity and functioning of fluvial systems, stabilizing slopes, regulating temperature, filtering and retaining nutrients, and providing habitat to aquatic communities. This study followed a multiparametric approach in Central Chile mediterranean streams. The (mas) results showed that the variables that better reflect the distribution of macroinvertebrates were conductivity and dissolved solids. These variables also correlated significantly with bank quality and stream habitat. This approximation suggests the integral evaluation of a stream system as a tool for conservation and restoration of integral health of aquatic ecosystems.

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8

HEMATOLOGÍA Y QUÍMICA SANGUÍNEA DE JUVENILES DE RUBIO (Salminus affinis PISCES: CHARACIDAE) DEL RÍO SINÚ/ Hematology and Blood Chemistry of Juveniles Rubio (Salminus affinis Pisces: Characidae) Captured in the River Sinú

ATENCIOGARCÍA, VÍCTOR; GENES LÓPEZ, FERNANDO; MADARIAGA MENDOZA, DIANA; PARDO CARRASCO, SANDRA
2007-12-01

Resumen en español Rubio Salminus affinis es un pez reofílico, distribuido en ríos de Colombia y Ecuador . Se estudiaron características hematológicas y química sanguínea buscando generar información básica para desarrollar tecnologías de producción piscícola. Fueron examinados diez rubios juveniles aparentemente sanos (117,5±38,6 g de peso y 17,6±3,3 cm de longitud total) capturados en el río Sinú. Los peces se tranquilizaron durante cinco minutos en agua a 18 °C y se tomar (mas) on 2 mL de sangre por vacutecnia con EDTA (Vacuette®, Greiner Bioone, USA). La química se determinó utilizando reactivos para cada parámetro (ByoSystems SA, España) y el hemograma se desarrolló con técnicas tradicionales, a excepción del recuento total de leucocitos y trombocitos en el que se utilizó el reactivo de Natt y Herricks. Los frotis sanguíneos fueron teñidos con Wright y en ellos se determinaron las dimensiones celulares. El recuento total de eritrocitos fue 2,2±0,4x10(6)/mm³, los trombocitos 25,4±4,4x10³/mm³ y los leucocitos fueron estimados en 6,1±2,0x10³/mm³. El conteo diferencial de leucocitos fue 68,8±5,9% linfocitos, 28,5±5,2% neutrófilos, 2,1±0,9% monocitos, 0,4±1,3% basófilos y 0,2±0,4% eosinófilos. La hemoglobina en 12,53±2,2 g/dL y el hematocrito 36,2%. Los índices eritrocitarios: volumen corpuscular medio (VCM) 163,8±22,6 fL, concentración de hemoglobina corpuscular media (CHCM) 35,0±7,5 g/dL y hemoglobina corpuscular media (HCM) de 58,5±19,7 pg. Las proteínas totales fueron 3,8±5,9 g/dL, glucosa 128,9±21,9 mg/dL, colesterol 277,8±92,7 mg/dL, triglicéridos 192,0±109,1 mg/dL y albúmina 2,0±0,3 g/dL. Los resultados sugieren que las características hematológicas de rubio están en el rango reportado para peces neotropicales aparentemente sanos. Resumen en inglés Rubio Salminus affinis is distributed in Colombia and Ecuador rivers. To develop new technologies of fishery production, hematological and blood chemistry of 10 juvenile Rubios captured in Sinú river, apparently healthy were examined (117.5+38.6 g of weight and 17.6+3.3 cm of total length). Fishes were calmed during five minutes in water at 18 °C and 2 mL of blood samples were taken in EDTA (Vacuette®). The chemistry was determined using ByoSystems INC ( Spain ), reage (mas) nts and blood count were developed with traditional techniques with the exception of total leukocyte and thrombocyte for which the reagent of Natt and Herricks was used. The blood smears were dyed with Wright and cellular dimensions were determined. The total erythrocytes were of 2.2+0.4x10(6)/mm³, thrombocytes 25.4+4.4x10³/mm³ and leukocytes were estimated in 6.1+2.0x10³/mm³. The differential count of leukocytes were of 68.8+5.9% Lymphocytes, 28.5+5.2% neutrophils, 2.1+0.9% monocytes, 0.4+1.3% basophils and 0.2+0.4% eosinophils. The hemoglobin in 12.53+2.2 g/dL, and the hematocrit 36.2%. The erythrocyte index: Mean corpuscular volume (MCV) 163.8+22.6 fL; mean corpuscular hemoglobin concentration (MCHC) 35.0+7.5 g/dL and mean corpuscular hemoglobin (MCH) 58.5+19.7 pg. Total proteins were 3.8+5.9 g/dL, glucose 128.9+21.9 mg/dL, cholesterol 277.8+92.7 mg/dL, triglycerides 192.0+109.1 mg/dL and albumin 2.0+0.3 g/dL. The results suggest that the hematological characteristics of Rubio are in range for neotropical apparently healthy fishes.

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9

La proteína verde fluorescente ilumina la biociencia/ The Green Fluorescent Protein that glows in Bioscience

Pérez Millán, María Inés; Becú-Villalobos, Damasia
2009-06-01

Resumen en español La proteína verde fluorescente (o GFP, por sus siglas en inglés, Green Fluorescent Protein) es una proteína producida por la medusa Aequorea victoria que emite bioluminiscencia en la zona verde del espectro visible. El gen que codifica esta proteína ha sido clonado y se utiliza habitualmente en biología molecular como marcador. Los descubrimientos relacionados a la GFP merecieron el Premio Nobel de Química 2008, en conjunto a los tres investigadores, Dres Shimomura, (mas) Chalfie y Tsien que participaron escalonadamente en dilucidar la estructura y función de la proteína. El Dr. Shimomura descubrió y estudió las propiedades de GFP, el Dr. Chalfie usando técnicas de biología molecular logró introducir el gen que codificaba para la GFP en el ADN del gusano transparente C. elegans, e inició la era de GFP como marcador de procesos en células y organismos. Finalmente el Dr. Tsien modificó la estructura de la proteína para producir moléculas que emiten luz a distintas longitudes de onda, extendiendo la paleta de colores de las proteínas. Las proteínas fluorescentes, entre las cuales se encuentra la GFP, son muy versátiles y se utilizan en diversos campos como la microbiología, ingeniería genética, fisiología, e ingeniería ambiental. Permiten ver procesos previamente invisibles, como el desarrollo de neuronas, cómo se diseminan las células cancerosas, o la contaminación de agua con arsénico, por mencionar algunos usos. Con la obtención de proteínas de muchos colores complejas redes biológicas pueden ser marcadas diferencialmente, lo que permite visualizar la biología celular en acción. Resumen en inglés Green fluorescent protein (GFP) is a protein produced by the jellyfish Aequorea victoria, that emits bioluminescence in the green zone of the visible spectrum. The GFP gene has been cloned and is used in molecular biology as a marker. The three researchers that participated independently in elucidating the structure and function of this and its related proteins, Drs. Shimomura, Chalfie and Tsien were awarded the Nobel Prize in Chemistry 2008. Dr. Shimomura discovered and (mas) studied the properties of GFP. Using molecular biological techniques, Chalfie succeeded in introducing the GFP gene into the DNA of the small, almost transparent worm C. elegans, and initiated an era in which GFP would be used as a glowing marker for cellular biology. Finally, Dr.Tsien found precisely how GFP's structure produces the observed green fluorescence, and succeeded in modifying the structure to generate molecules that emit light at slightly different wavelengths, which gave tags of different colors. Fluorescent proteins are very versatile and are being used in many areas, such as microbiology, biotechnology, physiology, environmental engineering, development, etc. They can, for example, illuminate growing cancer tumours; show the development of Alzheimer's disease, or detect arsenic traces in water. Finding the key to how a marine organism produces light unexpectedly ended up providing researchers with a powerful array of tools with which to visualize cell biology in action.

Scientific Electronic Library Online (Spanish)

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Determinación de nitrógeno amoniacal y total en aguas de consumo y residuales por el método del fenato/ Determination of ammoniacal and total nitrogen in drinking water and sewage by the phenate method

Sardiñas Peña, Olivia; Pérez Cabrera, Adisbel
2004-08-01

Resumen en español En este trabajo se presentan los resultados de la determinación de nitrógeno amoniacal y total por el método del fenato en aguas, con el propósito de evaluar los indicadores de calidad aplicados para la validación de métodos de ensayos en el laboratorio de Química Inorgánica del INHEM. Se evaluaron como indicadores de calidad: la precisión, el sesgo y la incertidumbre, los cuales fueron obtenidos en el rango lineal del gráfico de calibración. Se reporta el lím (mas) ite de detección del método así como la concentración de nitrógeno amoniacal y total de muestras de aguas de consumo y residuales procesadas por el método evaluado. Se procesaron muestras de aguas por los métodos indicados en el presente trabajo y se comprobó la normalidad en la distribución de los resultados mediante el test de Shapiro Wilk's W. Resumen en inglés The results of the determination of ammoniacal and total nitrogen by the method of phenate in waters were presented aimed at evaluating the quality indicators applied for the validation of assay methods at the Laboratory of Inorganic Chemistry of the National Institute of Hygiene, Epidemiology and Microbiology. The precision, bias and uncertainty that were obtained in the lineal range of the calibration graph were evaluated as health indicators. The limit of detection of (mas) the method as well as the concentration of ammoniacal and total nitrogen of samples of drinking water and sewage processed by the evaluated method were reported. Water samples were processed by the methods indicated in this paper and the normality in the distribution of the results was proved by Shapiro Wilk's W test.

Scientific Electronic Library Online (Spanish)

11

Geoquímica de ríos de montaña en las Sierras Pampeanas: II. El río Los Reartes, sierra de Comenchingones, provincia de Córdoba/ Geochemistry of mountain rivers in the Sierras Pampeanas: II. Los Reartes River, Sierra de Comenchingones, Province of Córdoba.

Pasquini, Andrea I.; Lecomte, Karina L.; Depetris, Pedro J.
2004-03-01

Resumen en español Se analiza la hidrogeoquímica de la cuenca del río Los Reartes, un típico sistema hídrico montañoso de las Sierras Pampeanas de Córdoba. La litología dominante está representada por rocas graníticas y gnéisicas del basamento. La altitud máxima es de 2.400 m s.n.m. y la mínima de 670 m s.n.m. Las pendientes decrecen desde el 20% en las nacientes hasta inferiores al 6% en las áreas bajas. El clima es semiárido con una concentración estival de las precipitacio (mas) nes. El pH de las aguas varía de 6,9 a 9,1 y los sólidos totales disueltos (STD) oscilan entre 31 y 114 mg/l. La composición mayoritaria está caracterizada por HCO3- > Cl-+ SO42- y Na++ Ca2+ > K++ Mg2+. El pH, los STD y la alcalinidad aumentan aguas abajo, las aguas evolucionan de bicarbonatadas sódicopotásicas a cálcicas. Los elementos traza disueltos tienen concentraciones de 10-3a 10-7 veces la corteza continental superior. Los más solubles (Ca, Na, K, Mg, Ba, Sr) presentan las mayores concentraciones disueltas, mientras los más inmóviles exhiben las más bajas. Los elementos de tierras raras (ETR) exhiben concentraciones disueltas extremadamente bajas (ΣETR de 30 a 319 ng/l), controladas principalmente por el pH y por procesos de adsorción. La distribución anual irregular de las precipitaciones ejerce un control estacional sobre las concentraciones. La química de estas aguas evidencia un control climático y litológico. La condición climática semiárida determina una incipiente alteración química de los silicatos y la litología constituye el factor determinante que imprime una señal química común a las aguas de la región. Resumen en inglés We analyzed the hydrogeochemistry of Río Los Reartes, a typical high-altitude, mountainous drainage basin in the Sierras Pampeanas of Córdoba, Argentina. The dominant rocks in the area are granites and gneisses of the crystalline basement. Maximum and minimum altitudes are 2,400 m, and 670 m above sea level, respectively. The slopes decrease from 20% in the headwaters down to 6% at the outfall. Climate is high-altitude semiarid with most of the rainfall concentrated dur (mas) ing the southern summer. The water pH oscillates between 6.9 and 9.1 and most total dissolved solids (TDS) determinations are in the 31 - 114 mg/l range. The preponderant chemical composition is characterised by HCO3- > Cl-+ SO42-, and by Na++ Ca2+ > K++ Mg2+. TDS, pH, with an alkalinity increase downstream, evolving from HCO3-- Na+- K+- type to HCO3-- Ca2+- type. Dissolved trace elements reach concentrations of 10-3 to 10-7 times lower than those in the upper continental crust. The more soluble elements (Ca, Na, K, Mg, Ba, Sr) exhibit the highest concentrations, whereas the less mobile are the least concentrated. As a result of pH and adsorption processes, rare earth elements (REE) show extremely low concentrations in the dissolved phases (ΣREE between 30 and 319 ng/l). The irregular distribution of rainfall exerts a seasonal control over REE concentrations; moreover, the chemistry of these waters reflects the joint control of rocks and climate. The prevailing semiarid conditions determine an incipient alteration in the silicates and the nature of the dominant rocks in the drainage govern a common chemical signature in the waters of the region.

Scientific Electronic Library Online (Spanish)

12

La Formación Corumbataí y su importancia en la industria cerámica del estado de São Paulo - Brasil/ The Corumbataí formation and its importance in the ceramic industry of the São Paulo State-Brazil

Christofoletti, S.R.; Moreno, M.M.T.; Motta, J.F.M.
2009-04-01

Resumen en español El desarrollo acelerado del polo cerámico de Santa Gertrudes (provincia de São Paulo) en la década de 90, fue causado principalmente por la localización privilegiada de la materia prima asociada al desarrollo tecnológico, las grandes reservas, el acceso fácil por autopistas que facilitan la distribución de los productos y la proximidad de los grandes centros consumidores. Este desarrollo facilitó que este Polo tuviera un "boom" en el inicio de 2007 en la fase de m (mas) adurez con una producción de 367 millones de metros cuadrados, transformándose así en el mayor polo cerámico de las Américas. De acuerdo con los estudios geológicos realizados en este trabajo, las rocas de la Formación Corumbataí, origen de la materia prima usada en el polo cerámico, fueron clasificadas en cinco litofacies: maciza, laminada, intercalada I, intercalada II y alterada. Estas litofacies, por sus características mineralógicas y químicas, fueron consideradas arcillas illíticas con porcentaje medio de fundentes. Tomando como referencia las Normas para baldosas cerámicas, las características cerámicas obtenidas en el laboratorio demostraron que la mayoría de la materia prima es compatible con el grupo BIIb (Absorción de agua entre 6 y 10%). Resumen en inglés The rapid development of the ceramic pole of Santa Gertrudes (São Paulo-Brazil) during the 90's was caused by the privileged localization of the raw material in conjunction with the technological development, large reserves, easy access of the highways helping the draining of the products as well as the proximity of the great consuming centers. This development led the ceramic pole to a "boom" in the decade of 90, entering its maturity phase, producing 367 million m² in (mas) the year of 2007, thus becoming the biggest Ceramic Pole in the American continent. According to the geological studies carried out in this work, the rocks of the Corumbataí Formation, source of the commodity used in the ceramic pole, were classified in five lithofacies: massive, laminated, intercalated I, intercalated II and altered. These lithofacies were considered by their mineralogy and chemistry to be melting clays with predominance of illite. Regarding the characteristic properties, the laboratory results demonstrated the majority of the samples to lie inside the Group BIIb (Absorption of water between 6 and 10%); it is compatible with the Classification of Ceramic Coverings.

Scientific Electronic Library Online (Spanish)

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Geoquímica de los ríos morichales de los llanos orientales Venezolanos/ Geochemistry of the "morichales" rivers from the Venezuelan eastern plains/ Geoquímica dos rios morichales dos planos orientais Venezuelanos

Mora Polanco, Abrahan; SánchezCalderón, Luzmila; Mac-Quhae Romero, César; Visáez Salazar, Francisco; Calzadilla, Malvis
2008-10-01

Resumen en portugués O objeto principal deste trabalho foi determinar o comportamento estacional das variáveis físico-químicas dos rios Morichales tomando mostras mensais das águas entre setembro 2002 e setembro 2003 em oito (8) estações distribuídas entre os rios Areo, Morichal Longo, Uracoa y Yabo. Os parâmetros pH, oxigênio disolto e condutividade foram determinados in situ, enquanto as concentrações de alguns nutrientes (NO3-, NH4+, nitrogênio total e fósforo total), íons ma (mas) joritários dissolvidos (Cl-, Na, K, Ca, Mg) e elementos traça (Fe e Al) foram medidas no laboratório. Todas as espécies químicas determinadas mostraram suas maiores concentrações durante o período de chuva, o que indica que nestes ecossistemas aquáticos, a contribuição de elementos pelas chuvas e a lavagem dos solos é mais eficiente que o processo de diluição por aumento de volume. Alguns elementos como o Na, o Mg e os cloretos são aportados principalmente pelas precipitações, enquanto o fósforo total, o Fe, o Al e grande parte o Ca dissolvido são aportados pelo substrato. Os valores o pH relacionam-se positivamente com o Ca dissolvido aportado pelo substrato. As relações encontradas entre o nitrogênio total, o Fe e o Al indicam que a presença destes elementos se encontra associada à presença de matéria orgânica dissolvida rica em compostos nitrogenados. Os resultados obtidos revelam que a composição química das águas dos rios Morichales se encontra associada à natureza arenosa dos solos, à cercania às zonas costeiras e a o tipo de vegetação presente nestes ecossistemas aquáticos. Resumen en español Se realizaron muestreos mensuales (set 2002-set 2003) de aguas en ocho estaciones en los ríos Areo, Morichal Largo, Uracoa y Yabo, a fin de estudiar el comportamiento estacional de las variables físico-químicas de estos ríos Morichales. Los parámetros pH, O2 disuelto y conductividad fueron determinados in situ, mientras que las concentraciones de algunos nutrientes (NO3-, NH4+, N total y P total), iones mayoritarios disueltos (Cl-, Na, K, Ca, Mg) y elementos trazas ( (mas) Fe y Al) fueron medidas en el laboratorio. Todas las especies evaluadas mostraron mayores concentraciones durante el período de lluvias, lo que indica que en estos ecosistemas acuáticos, el proceso de aporte de elementos por las lluvias y el lavado de los suelos es más eficiente que el proceso de dilución por aumento de caudal. Algunos elementos tales como Na, Mg y cloruros son aportados principalmente por las precipitaciones, mientras que P total, Fe, Al y gran parte del Ca disuelto son aportados por el sustrato. El pH se relaciona positivamente con el Ca disuelto proveniente del sustrato. Las relaciones encontradas entre N total, Fe y Al indican que las solubilidades de ambos metales se incrementan por la presencia de materia orgánica soluble rica en N. Los resultados revelan que la composición química de las aguas de los ríos Morichales está condicionada por la naturaleza arenosa de los suelos, la cercanía a zonas costeras y el tipo de vegetación presente en estos ecosistemas acuáticos. Resumen en inglés Monthly (Sept 2002-Sept 2003) water samples were collected in eight stations at the Areo, Morichal Largo, Uracoa and Yabo rivers, to determine the seasonal behavior of some physicochemical variables in these "Morichales" rivers. Parameters such as pH, dissolved O2 and conductivity were measured in situ, whereas concentrations of nutrients (NO3-, NH4+, total N and total P), dissolved major ions (Cl-, Na, K, Ca, Mg) and dissolved trace elements (Fe and Al) were measured in (mas) the laboratory. All the evaluated species showed higher concentrations in the wet season, indicating that, in these aquatic ecosystems, the contribution by rains and the washing of soils prevails over the dilution by river flow increase. Elements such as Na, Mg, and chlorides are principally provided by rainfall, whereas Fe, Al, total P and most of the dissolved Ca are leached from the substratum. The pH values correlated positively with dissolved Ca provided from the substratum. The relationships found between Fe, Al and total N indicate that their solubilities increase due to the presence of soluble N-rich organic matter. The results show that the water chemistry of these rivers is controlled by the sandy nature of the soils, the distance from the sea and the kind of vegetation found in these aquatic ecosystems.

Scientific Electronic Library Online (Spanish)

14

Ácido ascórbico: desde la química hasta su crucial función protectiva en ojo/ Ascorbic acid: from chemistry to its crucial protective role in the eye

Serra, Horacio Marcelo; Cafaro, Thamara Analía
2007-12-01

Resumen en español La Vitamina C o ácido L-ascórbico (AA), es una vitamina esencial y un importante agente antioxidante hidrosoluble, que se sintetiza químicamente a partir de la glucosa, mediante una serie de reacciones enzimáticas, siendo la L-gulono-g-lactona oxidasa (GLO) la última enzima involucrada. La incapacidad de sintetizar AA por ausencia de GLO ocurrió hace cientos de millones de años y se manifiesta sólo en algunas especies. La degradación del AA se lleva a cabo median (mas) te procesos oxidativos que involucran la hidrólisis del anillo lactona para producir ácido 2,3-dicetogulónico (DCG), que posteriormente se degrada por decarboxilación, generando productos coloreados, encontrados en algunas patologías oculares. Entre las diferentes propiedades del AA cabe mencionar su capacidad de absorber radiación ultravioleta (RUV) y evitar el daño fotoquímico en órganos expuestos. En humanos, y en algunos animales (cobayos, ciertos primates, etc.) el humor acuoso tiene mayor concentración de AA que el plasma. Esto responde a un mecanismo de transporte activo especializado en el cuerpo ciliar que se encarga de transportar el AA desde la sangre hacia el humor acuoso y desde allí al epitelio corneal, transformando a la córnea en la estructura del ojo responsable de la mayor absorción de RUV. Resumen en inglés Vitamin C or L-ascorbic acid (AA) is an essential vitamin and a water soluble important antioxidant agent, chemically synthesized from glucose, by enzymatic reactions, being the L-gulono-g-lactone oxidase (GLO) the last enzyme involved. The inability to synthesize AA by some species, due to the absence of GLO seems to have happened hundreds of millions years ago. The degradation of the AA is carried out by oxidative processes which involve the hydrolysis of the lactona ri (mas) ng to produce 2,3-diketogulonic acid (DCG) that is later degraded by decarboxilation, generating colored products, found in some ocular pathologies. Among the different properties of the AA, it is worth mentioning its capacity to absorb ultraviolet radiation (RUV) and to avoid the photochemical damage of exposed tissues. In humans and in some animals (guinea pigs, primates, etc) the aqueous humor has bigger concentrations of AA than plasma. This responds to a mechanism of specialized active transport in the ciliary body that transfers AA from the blood towards the aqueous humor and from there to the corneal epithelium, transforming the cornea into the structure of the eye responsible for the biggest absorption of RUV.

Scientific Electronic Library Online (Spanish)

15

Wormlike micelles in mixed surfactant systems: effect of cosolvents

Varade, Dharmesh; Rodríguez-Abreu, Carlos; Shrestha, Lok Kumar; Aramaki, Kenji
2007-08-16

Digital.CSIC (Spain)

16

Wheat fiber as a functional ingredient in restructured fish products

Sánchez Alonso, Isabel; Haji-Maleki, Ramin; Borderías, A. Javier
2007-01-01

Digital.CSIC (Spain)

17

Water-soluble carbosilane dendrimers protect phosphorothioate oligonucleotides from binding to serum proteins

Chenco, Louis; Bermejo Marín, Jesús F.; Ortega, Paula; Shcharbin, Dzmitry; Pedziwiatr, Elzbieta; Klajnert, Barbara; Mata, Javier F. de la; Eritja Casadellà, Ramón; Gómez, Rafael
2007-05-14

Digital.CSIC (Spain)

18

Water-soluble and water-stable gold(I), gold(II) and gold(III) phosphine complexes: The early years

Mohr, Fabian; Sanz, Sergio; Vergara, Elena; Cerrada, Elena; Laguna, Mariano
2006-01-01

Digital.CSIC (Spain)

20

Waste-derived activated carbons for removal of ibuprofen from solution: Role of surface chemistry and pore structure

Mestre, Ana S. ; Pires, João ; Nogueira, José M. F. ; Parra Soto, José Bernardo ; Carvalho, Ana P. ; Ovín Ania, M.ª Concepción

7 pages, 4 figures, 3 tables. -- PMID: 19006666 [PubMed]. -- Available online 8 November 2008. | The removal of a widespread used drug (i.e., ibuprofen) from water was investigated using high valuable carbon adsorbents obtained from chemical and physical activation of a bioresource (cork) and a muni...

DRIVER (Spanish)

21

Warm water vapour in the sooty outflow from a luminous carbon star

Decin, L.; Agúndez, Marcelino; Barlow, Michael J.; Daniel, F.; Cernicharo, José; Lombaert, J. R.; Beck, E. de; Royer, P.; Vandenbussche, B.; Wesson, R.; Polehampton, E. T.; Blommaert, J. A. D. L.; Meester, W. de; Exter, K.; Feuchtgruber, H.; Gear, W. K.; Gomez, H. L.; Groenewegen, M. A. T.; Guélin, M.; Hargrave, P. C.; Huygen, R.; Imhof, P.; Ivison, R. J.; Jean, C.; Kahane, C.; Kerschbaum, F.; Leeks, S. J.; Lim, T.; Matsuura, M.; Olofsson, G.; Posch, T.; Regibo, S.; Savini, G.; Sibthorpe, B.; Swinyard, B. M.; Yates, J. A.; Waelkens, C.
2010-09-02

Digital.CSIC (Spain)

22

Variabilidad fisicoquímica del agua en la ciénaga El Eneal, reserva natural Sanguaré municipio de San Onofre-Sucre, Colombia/ Physical chemistry water variation of the swamp El Eneal, Sanguaré natural reserve municipality of San Onofre-Sucre, Colombia

Ríos, Elkin Libardo; Palacio, Jaime Alberto; Aguirre, Néstor Jaime
2008-12-01

Resumen en español Entre mayo del 2003 y abril del 2004, en la ciénaga El Eneal, municipio de San Onofre-Sucre, se midieron los perfiles de temperatura del agua, oxígeno disuelto, pH, conductividad eléctrica y salinidad a través de un diseño nictemeral. Se encontró que el sistema es un ambiente completamente mezclado desde el punto de vista térmico debido a la acción de los vientos, de su morfología y de su ubicación cerca de la línea costera. También, se halló que esta ciénag (mas) a costera es un ambiente oligohalino en época seca; sin embargo, la mayor parte del tiempo el sistema puede considerarse como un ambiente limnético. En épocas prolongadas de sequía, la salinidad alcanzó su valor máximo de 3,4 ppm, lo cual podría constituir un factor limitante para comunidades de organismos estrictamente limnéticos. Resumen en inglés Profiles of water temperature, dissolved oxygen, pH, electrical conductivity and the salinity were measured in the swamp El Eneal municipality of San Onofre, Sucre, following a nictemeral design between May/2003 and April/2004. It was found that the system is completely mixed from the thermal point of view due to the action of the wind, in combination with the morphology and its location near the coastal line. It was also found that this coastal swamp is oligohalin, never (mas) theless most of the time the system can be considered as a limnetic system. During prolonged droughts, the salinity reached its maximum value of 3.4 ppm, which could become a limited factor for communities of strictly limnetics organisms.

Scientific Electronic Library Online (Spanish)

23

Validation of interlaboratory studies on toxicity in water samples

Farré Urgell, Marinel.la ; Martínez, E. ; Barceló, Damià

10 pages, 2 figures, 4 tables.-- Available online Dec 21, 2006.-- Issue title: Emerging tools as a new approach for water monitoring. | Toxicity tests are important for assessing the impact of chemicals on aquatic ecosystems because they indicate toxic effects of complex chemical mixtures. Several m...

DRIVER (Spanish)

24

Validation of interlaboratory studies on toxicity in water samples

Farré Urgell, Marinel.la; Martínez, Elena; Barceló, Damià
2007-04-01

Digital.CSIC (Spain)

25

Use of chemometric and geostatistical methods to evaluate pesticide pollution in the irrigation and drainage channels of the Ebro river delta during the rice-growing season

Terrado Casanovas, Marta ; Kuster, Marina ; Raldúa, Demetrio ; López de Alda, María J. ; Barceló, Damià

10 pages, 7 figures, 1 table.-- PMID: 17226004 [PubMed].-- Printed version published Feb 2007. | Data sets obtained from quantitative analysis ofseventeen pesticides in water samples from a network of irrigation and drainage channels in the Ebro river delta (Catalonia, NE Spain) have been analysed ...

DRIVER (Spanish)

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Use of chemometric and geostatistical methods to evaluate pesticide pollution in the irrigation and drainage channels of the Ebro river delta during the rice-growing season

Terrado Casanovas, Marta; Kuster, Marina; Raldúa, Demetrio; López de Alda, Miren; Barceló, Damià; Tauler Ferré, Romà
2007-01-17

Digital.CSIC (Spain)

27

Universal features of water dynamics in solutions of hydrophilic polymers, biopolymers, and small glass-forming materials

Cerveny, Silvina ; Alegría Loinaz, Ángel ; Colmenero de León, Juan

5 pp.-- PACS nrs.: 82.35.Pq, 61.25.Em, 77.22.Gm.-- PMID: 18517410. | A systematic investigation by dielectric spectroscopy of 18 different water-rich mixtures with very different hydrophilic substances shows universal features for the water dynamics. The temperature dependence of the relaxation time...

DRIVER (Spanish)

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Trace-level determination of pharmaceutical residues by LC-MS/MS in natural and treated waters. A pilot-survey study

Hernando, Maria Dolores ; Heath, E ; Petrovic, Mira ; Barceló, Damià

7 pages, 3 tables, 2 figures. | A pilot-survey study was performed by collecting samples (influent and effluent wastewaters, rivers and tap waters) from different locations in Europe (Spain, Belgium, Germany and Slovenia). A solid-phase extraction (SPE) followed by liquid chromatography–tandem mass ...

DRIVER (Spanish)

36

Tectonic hydrogeological survey of the Rio Tinto Mars analog: Implications for Mars underground water fluxes

Gómez-Ortiz, David ; Fernández Remolar, David ; Prieto Ballesteros, Olga ; Gómez Gómez, Felipe

Poster presented at: Bioastronomy 2007: Molecules, Microbes and Extraterrestrial Life (July 16-20, 2007, San Juan de Puerto Rico). | The Iberian Pyritic Belt (IPB) consists of a 250-km long geological unit in southern Iberian Peninsula, and contains massive sulfide deposits. Interaction between grou...

DRIVER (Spanish)

37

Tectonic hydrogeological survey of the Rio Tinto Mars analog: Implications for Mars underground water fluxes

Gómez-Ortiz, David; Fernández Remolar, David; Prieto Ballesteros, Olga; Gómez Gómez, Felipe
2007-07-01

Digital.CSIC (Spain)

38

Synthesis of the Antioxidant Hydroxytyrosol Using Tyrosinase as Biocatalyst

Espín de Gea, Juan Carlos; Soler-Rivas, Cristina; Cantos Villar, Emma; Tomás Barberán, Francisco; Wichers, Harry J.
2001-02-10

Digital.CSIC (Spain)

39

Synthesis and crystal structure of the monoclinic modification of Yb(ReO4)3(H2O)4

Mujica, Carlos; Llanos, Jaime; Sánchez, Víctor; Gómez-Romero, P.; Casañ Pastor, Nieves
2003-04-01

Digital.CSIC (Spain)

40

Surface-water quality for the Salí River watershed in NW Argentina

Fernandez-Turiel, J. L.; Pérez Miranda, C.; Almada, G. H.; Medina, María E.; Riviere, C. A.; Gordillo, M. A.
2003-01-01

Digital.CSIC (Spain)

42

Study of adsorption and penetration of E2(279-298) peptide into Langmuir phospholipid monolayers

Larios, Cristina; Miñones Jr., J.; Haro Villar, Isabel; Alsina, M. Asunción; Busquets, M. Antònia; Miñones Trillo, J.
2006-10-25

Digital.CSIC (Spain)

43

Strategy for water analysis using ICP-MS

Fernandez-Turiel, J. L.; Llorens, J. F.; López-Vera, F.; Gómez-Artola, C.; Morell, I.; Gimeno, D.
2000-01-01

Digital.CSIC (Spain)

44

Spectroscopic and DFT Study of Tungstic Acid Peroxocomplexes

Barrio, Laura; Campos Martín, Jose Miguel; García Fierro, José Luis
2007-02-28

Digital.CSIC (Spain)

45

Simultaneous speciation of arsenic, selenium, antimony and tellurium species in waters and soil extracts by capillary electrophoresis and UV detection

Casiot, Corinne; Barciela, Mª del Carmen; Boisson, Jolanda; Donard, Olivier F. X.; Potin-Gautier, Martine
1998-01-01

Digital.CSIC (Spain)

46

Simultaneous quantitative analysis of anionic, cationic, and nonionic surfactants in water by electrospray ionization mass spectrometry with flow injection analysis

Barco, Mónica; Planas Pastor, Carles; Palacios Ruiz, Óscar; Ventura, Francesc; Rivera Aranda, Josep; Caixach Gamisans, Josep
2003-08-30

Digital.CSIC (Spain)

49

Separation and Quantification of the Carotenoid Pigments in Red Peppers (Capsicum annuum L.), Paprika, and Oleoresin by Reversed-Phase HPLC

Mínguez Mosquera, María Isabel ; Hornero Méndez, Dámaso

Fourteen carotenoids were separated and identified by reversed-phase HPLC in the saponified extractobtained from red pepper fruit, paprika, and oleoresin using gradient elution with acetone and waterand UV-visible detection at 450 nm. Quantification was achieved by HPLC with @-apo-8’-carotenalas ...

DRIVER (Spanish)

51

Sampling of water, soil and sediment to trace organic pollutants at a river-basin scale

Hildebrandt, Alain ; Lacorte Bruguera, Silvia ; Barceló, Damià

14 pages, 4 figures, 2 tables.-- PMID: 16721562 [PubMed].-- Printed version published Oct 2006. | Sampling is considered a crucial step in the analysis of organic compounds in the environment. This review describes field sampling techniques and provides detailed step-by-step procedures for collectio...

DRIVER (Spanish)

52

Sampling of water, soil and sediment to trace organic pollutants at a river-basin scale

Hildebrandt, Alain; Lacorte Bruguera, Silvia; Barceló, Damià
2006-05-24

Digital.CSIC (Spain)

54

Refinement of the Borohydride Reduction Method for Trace Analysis of Dissolved and Particulate Dimethyl Sulfoxide in Marine Water Samples

Simó, Rafel ; Malin, Gillian ; Liss, Peter S.

4 pages, 1 figure, 2 tables.-- Printed version published Nov 15, 1998. | A recently reported borohydride reduction method for the trace determination of aqueous dimethyl sulfoxide (DMSO) was adapted for use with a different sample preparation and analytical system, and the adaptation and optimizatio...

DRIVER (Spanish)

56

Recently developed GC/MS and LC/MS methods for determining NSAIDs in water samples

Farré Urgell, Marinel.la ; Petrovic, Mira ; Barceló, Damià

12 pages, 5 tables, 1 figure.-- PMID: 17203255 [PubMed].-- Printed version published Feb 2007. | Pharmaceuticals have become major targets inenvironmental chemistry due to their presence in aquatic environments (following incomplete removal in wastewater treatment or point-source contaminations), t...

DRIVER (Spanish)

57

Recently developed GC/MS and LC/MS methods for determining NSAIDs in water samples

Farré Urgell, Marinel.la; Petrovic, Mira; Barceló, Damià
2007-01-04

Digital.CSIC (Spain)

58

Recent advances in the sample preparation, liquid chromatography tandem mass spectrometric analysis and environmental fate of microcystins in water

Pérez Solsona, Sandra ; Aga, Diana S.

13 pages, 4 figures, 3 tables. | This review article covers recent developments in the analysis of microcystins(MCs), the natural toxins produced in cyanobacterial blooms thatoccur in many eutrophic waters. We report applications of new extractionmethodologies, such as immunosorbents for sample p...

DRIVER (Spanish)

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61

Protein and water structural changes in fish surimi during gelation as revealed by isotopic H/D exchange and Raman spectroscopy

Sánchez González, Ignacio ; Carmona, Pedro ; Moreno, Pilar ; Borderías, A. Javier ; Sánchez Alonso, Isabel

9 pages, 6 figures.-- Available online Jun 2, 2007. | Structural changes of proteins and water during gelation of fish surimi, have been studied by isotopic H/D exchange of water and Raman spectroscopy assisted by monitoring of rheological characteristics, in order to get insights into the structura...

DRIVER (Spanish)

62

Protein and water structural changes in fish surimi during gelation as revealed by isotopic H/D exchange and Raman spectroscopy

Sánchez González, Ignacio; Carmona, Pedro; Moreno, Pilar; Borderías, A. Javier; Sánchez Alonso, Isabel; Rodríguez-Casado, Arantxa; Careche, Mercedes
2008-01-01

Digital.CSIC (Spain)

64

Physics and chemistry of icy particles in the universe: answers from microgravity.

Ehrenfreund, P.; Fraser, H. J.; Blum, J.; Cartwright, Julyan H. E.; García-Ruiz, J. M.; Hadamcik, E.; Levasseur-Regourd, A. C.; Price, S.; Prodi, F.; Sarkissian, A.
2003-07-01

Digital.CSIC (Spain)

66

Part per trillion determination of atrazine in natural water samples by a surface plasmon resonance immunosensor

Farré Urgell, Marinel.la ; Martínez, Elena ; Ramón-Azcón, Javier ; Navarro, Alicia ; Radjenovic, Jelena

8 pages, 5 figures.-- PMID: 17393154 [PubMed].-- Printed version published in May 2007. | A new immunoassay for continuously monitoringatrazine in water has been developed. It uses a portable biosensor platform based on surface plasmon resonance (SPR) technology. This immunoassay is based on the bi...

DRIVER (Spanish)

68

Ozonated Water Extends the Shelf Life of Fresh-Cut Lettuce

Beltrán, David; Selma, María Victoria; Marín Fernández, Alicia; Gil Muñoz, M.ª Isabel
2005-06-11

Digital.CSIC (Spain)

69

Oxygen Chemistry in the Circumstellar Envelope of the Carbon-Rich Star IRC+10216

Agúndez, Marcelino ; Cernicharo, José

In this paper we study the oxygen chemistry in the C-rich circumstellar shells of IRC+10216. The recent discoveries of oxygen bearing species (water, hydroxyl radical and formaldehyde) toward this source challenge our current understanding of the chemistry in C-rich circumstellar envelopes. The pres...

DRIVER (Spanish)

72

Organocatalysis "on water". Regioselective [3 + 2]-cycloaddition of nitrones and allenolates

González-Cruz, David ; Tejedor, David ; Armas, Pedro de ; Morales, Ezequiel Q. ; García-Tellado, Fernando

3 pages, 2 tables, 2 schemes.-- PMID: 17009467 [PubMed]. | The first example of a regioselective and organocatalyzed 1,3-dipolar cycloaddition reaction between conjugated alkynoates and nitrones "on water" is described. | This research was supported by the Spanish Ministerio de Educación y Ciencia a...

DRIVER (Spanish)

73

Organocatalysis "on water". Regioselective [3 + 2]-cycloaddition of nitrones and allenolates

González-Cruz, David; Tejedor, David; Armas, Pedro de; Morales, E.; García-Tellado, Fernando
2006-05-26

Digital.CSIC (Spain)

74

Organic compounds in paper-mill process waters and effluents

Lacorte Bruguera, Silvia; Latorre Fernández, Anna; Barceló, Damià; Rigol, Anna; Malmqvist, Asa; Welander, Thomas
2003-11-01

Digital.CSIC (Spain)

75

Optimization of accelerated solvent extraction of antioxidants from Spirulina platensis microalga

Herrero, Miguel ; Martín-Álvarez, Pedro J. ; Señoráns, Javier ; Cifuentes, Alejandro ; Ibáñez, Elena

An experimental design has been used to optimize the extraction of antioxidants from the microalga Spirulina platensis usingaccelerated solvent extraction (ASE) with four different solvents (hexane, petroleum ether, ethanol and water). The optimizationof the main variables involved in the ASE proc...

DRIVER (Spanish)

76

Optimization of accelerated solvent extraction of antioxidants from Spirulina platensis microalga

Herrero, Miguel; Martín-Álvarez, Pedro J.; Señorans, F. Javier; Cifuentes, Alejandro; Ibáñez, Elena
2005-01-01

Digital.CSIC (Spain)

77

On-line determination of 3,5,6-trichloro-2-pyridinol in human urine samples by surface plasmon resonance immunosensing

Mauriz, Elba; Calle Martín, Ana; Manclús, J. J.; Montoya, Ángel; Lechuga, Laura M.
2007-02-21

Digital.CSIC (Spain)

78

Oil-induced anomalous thermoresponsive viscoelasticity in fluorinated surfactant systems

Sharma, Suraj Chandra; Rodríguez-Abreu, Carlos; Shrestha, Lok Kumar; Aramaki, Kenji
2007-10-04

Digital.CSIC (Spain)

79

Monitoring of drinking water treatment plants using ICP-MS

Fernandez-Turiel, J. L.; Llorens, J. F.; Roig, A.; Carnicero, M.; Valero, F.
2000-01-01

Digital.CSIC (Spain)

80

Modeling the physico-chemistry of acid sulfate waters through Raman spectroscopy of the system FeSO4-H2SO4-H2O

Sobrón, Pablo; Rull, Fernando; Sobron, Francisco; Sanz Arranz, Aurelio; Medina, J.; Nielsen, C. J.
2007-05-14

Digital.CSIC (Spain)

81

Mineralización del nitrógeno, carbono y actividad enzimática del suelo en un bosque de Nothofagus obliqua (Mirb) Oerst y una plantación de Pinus radiata D. Don. del centro-sur de Chile/ Nitrogen and carbon mineralization and enzyme activity in soils of Nothofagus obliqua (Mirb) Oerst stands and Pinus radiata D. Don plantation in south-central Chile

RIVAS, YESSICA; OYARZÚN, CARLOS; GODOY, ROBERTO; VALENZUELA, EDUARDO
2009-03-01

Resumen en español En Chile, el establecimiento de plantaciones comerciales de rápido crecimiento ha sido sostenido en las últimas décadas mediante la sustitución de bosques nativos y conversión de suelos agrícolas. Pinus radiata D. Don es la principal especie productiva, debido a su crecimiento acelerado y adaptabilidad al clima y los suelos. En el presente estudio se plantea que la actividad biológica del suelo es variable a través del año, en respuesta a variaciones de precipita (mas) ción, temperatura y contenido de humedad de suelo y que el cambio de uso de suelo desde un bosque templado de Nothofagus obliqua (Mirb) Oerst a una plantación con coniferas exóticas, modifica la química del suelo y consecuentemente los procesos de N-min, C-min y la actividad biológica del suelo. Esta hipótesis fue examinada en un bosque de N. obliqua y una plantación de P. radiata del centro-sur de Chile (40°07' S, 72° O). Se evaluó mensualmente la tasa mineralización de nitrógeno (N-min), cabono (C-min) y la actividad enzimática potencial del suelo (ureasa, proteasa e hidrólisis de la fluoresceína diacetato) entre septiembre 2003 y mayo 2005. Los resultados demuestran que los niveles de las variables de actividad biológica del suelo fueron significativamente diferentes entre las parcelas de bosque y plantación (Lambda de Wilk = 0,022; F 5,80 = 733; P Resumen en inglés In Chile, commercial forests plantations have increased during the last decades due in part to replacement of native forests and conversion of agricultural soils. Pinus radiata D. Don has been the main tree planted, due to its rapid growth and adaptability. In the present study we proposed that biological activity varies along the year due to changes of precipitation, temperature and soil water content and mainly because the conversion of native forest to exotic P. radiat (mas) a plantations alters the soil chemistry, N and C mineralization and the potential enzymatic activity in these soils. This hypothesis was examined in a Nothofagus obliqua (Mirb) Oerst forest and P. radiata plantation in central-southern Chile (40°07' S, 72° W). In this study, the rate of nitrogen mineralization (N-min), carbon mineralization (C-min) and the potential enzymatic activity of soils (urease, protease and fluorecein diacetate hydrolysis) were determined between September 2003 and May 2005. Results showed that soil biological activity was significantly different between forest and plantations (Wilk's Lambda = 0.022; F> 5,80 = 733, P

Scientific Electronic Library Online (Spanish)

82

Microstructural characterization of aged mortar by destructive and non-destructive testing

Segura Pérez, Ignacio; Anaya Velayos, José Javier; Hernández, M. G.; Macphee, D. E.; Moragues, A.; Sánchez Martín, Teresa
2008-01-01

Digital.CSIC (Spain)

84

Limestone selection criteria for EDR water remineralization

Ruggieri, Flavia; Fernandez-Turiel, J. L.; Gimeno, D.; Valero, F.; García, J. C.; Medina, María E.
2008-04-01

Digital.CSIC (Spain)

85

Lettuce and Chicory Byproducts as a Source of Antioxidant Phenolic Extracts

Llorach, Rafael; Tomás Barberán, Francisco; Ferreres, Federico
2004-07-20

Digital.CSIC (Spain)

86

Laboratory intercomparison study for the analysis of nonylphenol and octylphenol in river water

Loos, R.; Wollgast, J.; Castro-Jiménez, J.; Mariani, G.; Huber, T.; Locoro, G.; Hanke, G.; Umlauf, G.; Hohenblum, P.; Moche, W.; Weiss, S.; Schmid, H.; Leiendecker, F.; Ternes, T.; Navarro Ortega, Alicia; Hildebrandt, Alain; Barceló, Damià; Lepom, P.; Dimitrova, I.; Nitcheva, O.; Polesello, S.; Valsecchi, S.; Boutrup, S.; Sortkjaer, O.; De Boer, R.; Staeb, J.
2008-01-01

Digital.CSIC (Spain)

87

LC-based analysis of drugs of abuse and their metabolites in urine

Pizzolato, Tânia Mara ; López de Alda, María J. ; Barceló, Damià

16 pages, 6 figures, 2 tables.-- Printed version published Jun 2007.-- Issue title: Pharmaceutical-residue analysis. | In the literature, many analytical methods have been described for the determination of illicit drugs in biological fluids. Urine is one of the preferred matrices for control of dru...

DRIVER (Spanish)

89

Interactions in YBa2Cu3O7-x aqueous suspensions

Dusoulier, Laurent; Cloots, Rudi; Vertruyen, Bénédicte; Garcia-Fierro, Jose L; Moreno, Rodrigo; Ferrari, Begona

Surface charging mechanism of YBa2Cu3O7-x (YBCO) particles in water has been investigated in order to understand their colloidal behaviour and stabilise concentrated suspensions. A broad study relating the suspension parameters (pH and zeta potential) vs. the conditions of the suspension performance...

DRIVER (Spanish)

90

Integrated procedure for determination of endocrine-disrupting activity in surface waters and sediments by use of the biological technique recombinant yeast assay and chemical analysis by LC-ESI-MS

Céspedes, Raquel; Petrovic, Mira; Raldúa, Demetrio; Saura, Úrsula; Piña, Benjamín; Lacorte Bruguera, Silvia; Viana, Paula; Barceló, Damià
2004-02-04

Digital.CSIC (Spain)

91

Influence of the saturation chain and head group charge of phospholipids in the interaction of hepatitis G virus synthetic peptides

Pérez, S.; Miñones Jr., J.; Espina, Marta; Alsina, M. Asunción; Haro Villar, Isabel; Mestres, Concepció
2005-10-01

Digital.CSIC (Spain)

92

Home-prepared anatase, rutile, and brookite TiO2 for selective photocatalytic oxidation of 4-methoxybenzyl alcohol in water: reactivity and ATR-FTIR study

Augugliaro, V.; Kisch, H.; Loddo, V.; López-Muñoz, M.J.; Márquez-Alvarez, C.; Palmisano, G.; Palmisano, L.; Parrino, F.; Yurdakal, S.
2009-03-09

Digital.CSIC (Spain)

93

Gold(I) and palladium(II) thiolato complexes containing water-soluble phosphane ligands

Vergara, Elena; Miranda, Susana; Mohr, Fabian; Cerrada, Elena; Tiekink, Edward R. T.; Romero, Pilar; Mendía, Aránzazu; Laguna, Mariano
2007-05-01

Digital.CSIC (Spain)

94

Fully Automated Determination in the Low Nanogram per Liter Level of Different Classes of Drugs of Abuse in Sewage Water by On-Line Solid-Phase Extraction-Liquid Chromatography-Electrospray-Tandem Mass Spectrometry

Postigo, Cristina ; López de Alda, María J. ; Barceló, Damià

12 pages, 6 figures.-- Printed version published on May 1, 2008. | The present work describes the first fully automated method, based on on-line solid-phase extraction (SPE)-liquid chromatography-electrospray-tandem mass spectrometry, developed for the determination of drugs of abuse (17 compounds a...

DRIVER (Spanish)

96

Flavonoids and phenolic acids of sage: Influence of some agricultural factors

Areias, Filipe M.; Valentão, Patricia; Andrade, Paula B.; Ferreres, Federico; Seabra, Rosa M.
2000-11-15

Digital.CSIC (Spain)

97

Feasibility of high-performance immunochromatography as an isolation method for PCBs and other dioxin-like compounds

Concejero, Miguel A.; Galvé, Roger; Herradón García, Bernardo; González, M. Jesús; Frutos, Mercedes de
2001-05-16

Digital.CSIC (Spain)

98

Fate of gasoline oxygenates in conventional and multilevel wells of a contaminated groundwater table in Düsseldorf, Germany

Rosell Linares, Mònica; Lacorte Bruguera, Silvia; Forner, Claudia; Rohns, Hans-Peter; Irmscher, Rudolf; Barceló, Damià
2005-05-04

Digital.CSIC (Spain)

99

Fate and occurrence of X-ray contrast media in the environment

Pérez Solsona, Sandra; Barceló, Damià
2007-02-01

Digital.CSIC (Spain)

100

Evaluation of commercial immunoassays for the detection of estrogens in water by comparison with high-performance liquid chromatography tandem mass spectrometry HPLC–MS/MS (QqQ)

Farré Urgell, Marinel.la ; Brix, Rikke ; Kuster, Marina ; Rubio, Fernando ; Goda, Yasuhiro ; López de Alda, María J.

11 pages, 5 figures, 5 tables. | In this work four different commercially available enzyme-linked immunosorbent assays (ELISA) (from Japan EnviroChemicals, Ltd., Tokyo, Japan) were evaluated in terms of performance for the rapid screening of estrogens in different water matrices, including natural a...

DRIVER (Spanish)

101

Evaluation of commercial immunoassays for the detection of estrogens in water by comparison with high-performance liquid chromatography tandem mass spectrometry HPLC–MS/MS (QqQ)

Farré Urgell, Marinel.la; Brix, Rikke; Kuster, Marina; Rubio, Fernando; Goda, Yasuhiro; López de Alda, Miren; Barceló, Damià
2006-07-01

Digital.CSIC (Spain)

102

Estudio hidrogeoquímico de la cuenca del Río Adra

Benavente Herrero, J.; Castillo Martín, A.
1989-04-30

Digital.CSIC (Spain)

103

Estrogenic potential of halogenated derivatives of nonylphenol ethoxylates and carboxylates

García-Reyero, Natàlia; Requena, Vanessa; Petrovic, Mira; Fischer, Birgit; Hansen, Peter-Diedrich; Díaz, Alfredo; Ventura, Francesc; Barceló, Damià; Piña, Benjamín
2004-03-01

Digital.CSIC (Spain)

104

Estimated Future Production of Desalinated Seawater in the MENA Countries and Consequences for the Recipients

Bashitialshaaer, Raed; Persson, Kenneth M; Larson, Magnus

Seawater desalination constitutes an important source for water supply to the population bordering the Arabian Gulf, the Mediterranean Sea, and the Red Sea. Desalination has advantages and disadvantages which may depend on the region, location, technology, impact and amount of fresh water production...

DRIVER (Spanish)

105

Environmental risk assessment of pharmaceutical residues in wastewater effluents, surface waters and sediments

Hernando, María Dolores; Mezcua, M.; Fernández Alba, Amadeo R.; Barceló, Damià
2006-04-15

Digital.CSIC (Spain)

106

Environmental analysis of fluorinated alkyl substances by liquid chromatography–(tandem) mass spectrometry: a review

Villagrasa, Marta ; López de Alda, María J. ; Barceló, Damià

20 pages, 4 figures, 3 tables.-- PMID: 16710693 [PubMed].-- Printed version published Oct 2006. | Fluorinated alkyl substances (FASs) are widely distributed contaminants that have been found in many environmental, human and biological samples throughout the world. Perfluorochemicals are used in many...

DRIVER (Spanish)

107

Enrichment of organochlorine contaminants in the sea surface microlayer: An organic carbon-driven process

García-Flor, Nuria; Guitart, Carlos; Ábalos, Manuela; Dachs, Jordi; Bayona Termens, Josep María; Albaigés Riera, Joan
2005-06-01

Digital.CSIC (Spain)

109

Effects of Microwave Cooking Conditions on Bioactive Compounds Present in Broccoli Inflorescences

López-Berenguer, Carmen; Carvajal, Micaela; Moreno, Diego A.; García-Viguera, Cristina
2007-01-01

Digital.CSIC (Spain)

110

Effect of Regulated Deficit Irrigation and Crop Load on the Antioxidant Compounds of Peaches

Buendía, Begoña; Allende, Ana; Nicolás Nicolás, Emilio; Alarcón Cabañero, Juan José; Gil Muñoz, M.ª Isabel
2008-05-01

Digital.CSIC (Spain)

111

ESTABILIZACIÓN DEL PIGMENTO AZUL ULTRAMAR EN CEMENTO PÓRTLAND BLANCO/ STABILIZATION OF ULTRAMARINE BLUE PIGMENT IN WHITE PORTLAND CEMENT

MORALES RENDÓN, JUAN GUILLERMO; RESTREPO BAENA, OSCAR JAIME
2008-07-01

Resumen en español Se prepararon muestras de cemento azul a partir de cemento Pórtland Blanco Tipo III, según Normas Técnicas Colombianas NTC y pigmento Azul Ultramar U-601 adicionado en un 2% en peso del cemento. El cemento se caracterizó químicamente por fluorescencia de rayos X, y físicamente mediante los ensayos típicos según las NTC. Al pigmento y al cemento se les determinaron sus coordenadas cromáticas por espectrofotometría mediante el sistema CIELAB. Se eligieron varios a (mas) ditivos y adiciones (entre orgánicos, inorgánicos y minerales) para ser adicionados al cemento azul en diferentes dosificaciones en peso. Tanto a las muestras de cemento azul sin aditivo como a aquellas con las diferentes dosificaciones de aditivos, se les determinaron sus características físicas de desempeño y coordenadas cromáticas a diferentes edades de curado en agua saturada con cal (1, 3, 7 y 28 días). Adicionalmente se les determinó el color en las mismas edades a especimenes curados a las condiciones ambientales del laboratorio. Se presentó decoloración total en todos aquellos cementos adicionados con aditivos orgánicos, y decoloración parcial en los cementos adicionados con algunos de los aditivos inorgánicos y ciertas adiciones minerales. Tanto los tiempos de fraguado, como las resistencias a la compresión y demás variables de desempeño experimentaron cambios significativos, en algunos casos positivos y en otros negativos, como consecuencia y efecto de las diferentes dosificaciones utilizadas de cada uno de los aditivos. Resumen en inglés Samples of blue cement were prepared from white Portland cement type III, according to Colombian Standards (CS) and ultramarine blue pigment U-601 like admixture in 2% in weight of cement. Cement was chemistry tested by fluorescence of X-ray, and physical properties according to CS. Pigment and cement were tested in chromatic parameters by spectrophotometer through CIELAB system. Some additives and admixtures were selected (among organic, inorganic and mineral) to be adde (mas) d to the blue cement in a ranging of weight of cement. Samples of blue cement without additives but also those samples with different dosages of additives in the selected range were tested in physical and chromatic properties for different ages (1, 3, 7 and 28 days) when specimens were immersed in water saturated with lime. Additional to this, chromatic properties to some specimens at the laboratory conditions were tested at the same ages of time. Blue color completely disappeared with all organic additives and partially disappeared in some inorganic additives and mineral admixtures. Setting time, compressive strength and others characteristic of cement were affected, in some cases positive and in others negative, like effect of the different quantities of additives and admixtures added to the blue cement.

Scientific Electronic Library Online (Spanish)

112

Dynamic Modeling of Food-Chain Accumulation of Brominated Flame Rettardants in Fish from the Ebro River Basin

Van Beusekom, Otto. C; Eljarrat, Ethel; Barceló, Damià; Koelmans, Albert. A
2006-10-01

Digital.CSIC (Spain)

113

Dual reactivity pattern of allenolates "on water": the chemical basis for efficient allenolate-driven organocatalytic systems

Gónzález-Cruz, David ; Tejedor, David ; Armas, Pedro de ; García-Tellado, Fernando

10 pages, 4 tables, 7 schemes.-- PMID: 17450516 [PubMed].-- Printed version published Jun 4, 2007. | A study of the reactivity pattern associated with zwitterionic allenolates "on water" is reported. This study establishes the chemical basis for two organocatalyzed allenolate-driven reaction network...

DRIVER (Spanish)

114

Dual reactivity pattern of allenolates "on water": the chemical basis for efficient allenolate-driven organocatalytic systems

Gónzález-Cruz, David; Tejedor, David; Armas, Pedro de; García-Tellado, Fernando
2007-04-20

Digital.CSIC (Spain)

116

Discovery of Interstellar Heavy Water

Butner, H. M.; Charnley, S. B.; Ceccarelli, C.; Rodgers, S. D.; Pardo Carrión, Juan Ramón; Parise, B.; Cernicharo, José; Davis, G. R.
2007-04-20

Digital.CSIC (Spain)

117
118

Determination of antimicrobial residues and metabolites in the aquatic environment by liquid chromatography tandem mass spectrometry

Díaz-Cruz, M.Silvia ; Barceló, Damià

13 pages, 2 figures, 3 tables. | Antimicrobials are used in large quantities in human and veterinary medicine. Their environmental occurrence is of particular concern due to the potential spread and maintenance of bacterial resistance. After intake by the organisms, the unchanged drug and its metabo...

DRIVER (Spanish)

120

Detection and evaluation of endocrine-disruption activity in water samples from Portuguese rivers

Quirós, Laia; Céspedes, Raquel; Lacorte Bruguera, Silvia; Viana, Paula; Raldúa, Demetrio; Barceló, Damià; Piña, Benjamín
2005-02-01

Digital.CSIC (Spain)

121

Design of Natural Food Antioxidant Ingredients through a Chemometric Approach

Mendiola, Jose A.; Martín-Álvarez, Pedro J.; Señorans, F.J; Reglero, Guillermo; Capodicass, Alessandro; Nazzaro, Filomena; Sada, Alfonso; Cifuentes, Alejandro; Ibáñez, Elena
2010-01-01

Digital.CSIC (Spain)

122

Combined use of biomarkers and in situ bioassays in Daphnia magna to monitor environmental hazards of pesticides in the field

Barata Martí, Carlos; Damásio, Joana B.; López, Miguel Ángel; Kuster, Marina; López de Alda, Miren; Barceló, Damià; Riva, Mari Carmen; Raldúa, Demetrio
2007-02-01

Digital.CSIC (Spain)

123

Combinatorial Saturation Mutagenesis by in vivo Overlap Extension for the Engineering of Fungal Laccases

Alcalde Galeote, Miguel; Zumárraga, Miren; Polaina, Julio; Ballesteros, Antonio; Plou Gasca, Francisco José
2006-01-01

Digital.CSIC (Spain)

125

Chemometric modeling of main contamination sources in surface waters of Portugal

Tauler Ferré, Romà; Lacorte Bruguera, Silvia; Guillamón, Miriam; Céspedes, Raquel; Viana, Paula; Barceló, Damià
2004-03-01

Digital.CSIC (Spain)

126

Chemical production by Pulse-Laser Irradiation on Ices: Simulation of impact shock-induced chemistry

Nna Mvondo, Delphine; Khare, Bishun N.; Ishihara, Tomoko; McKay, Christopher P.
2007-07-01

Digital.CSIC (Spain)

127

Chemical monitoring and occurrence of alkylphenols, alkylphenol ethoxylates, alcohol ethoxylates, phthalates and benzothiazoles in sewage treatment plants and receiving waters along the Ter River basin (Catalonia, N. E. Spain)

Céspedes, Raquel ; Lacorte Bruguera, Silvia ; Ginebreda Martí, Antoni ; Barceló, Damià

9 pages, 2 figures, 2 tables. | This study presents a quantitative estimation of the analysis and fate of several emerging pollutants, some of them endocrine-disrupting compounds, in surface water samples collected at several locations along the Ter River and two of its tributaries. Influent and eff...

DRIVER (Spanish)

129

Bioluminescence inhibition assays for toxicity screening of wood extractives and biocides in paper mill process waters

Rigol, Anna; Latorre Fernández, Anna; Lacorte Bruguera, Silvia; Barceló, Damià
2004-02-01

Digital.CSIC (Spain)

130

Assessment of priority pesticides, degradation products, and pesticide adjuvants in groundwaters and top soils and pesticide adjuvants in groundwaters and top soils from agricultural areas of the Ebro river basin

Hildebrandt, Alain ; Lacorte Bruguera, Silvia ; Barceló, Damià

10 pages, 2 figures, 4 tables.-- PMID: 17211597 [PubMed].-- Printed version published Feb 2007. | Gas chromatography-mass spectrometry (GC/MS) was employed for the determination of 30 widely used pesticides including various transformation products and alkylphenols in water and agricultural soils w...

DRIVER (Spanish)

132

Artichoke (Cynara scolymus L.) Byproducts as a Potential Source of Health-Promoting Antioxidant Phenolics

Llorach, Rafael; Espín de Gea, Juan Carlos; Tomás Barberán, Francisco; Ferreres, Federico
2002-05-02

Digital.CSIC (Spain)

133

Application of ring study: Water toxicity determinations by bioluminescence assay with Vibrio fischeri

Hernando, María Dolores; Malato, O.; Farré Urgell, Marinel.la; Fernández Alba, Amadeo R.; Barceló, Damià
2006-04-15

Digital.CSIC (Spain)

137

Analysis, occurrence and fate of MTBE in the aquatic environment over the past decade

Rosell Linares, Mònica ; Lacorte Bruguera, Silvia ; Barceló, Damià

14 pages, 4 figures, 2 tables.-- Printed version published Nov 2006. | In the past decade, it became progressively more evident that fuel oxygenate methyl tertiary butyl ether (MTBE) is nearly ubiquitous in the worldwide environment. The frequency of detection of MTBE rivals other volatile organic c...

DRIVER (Spanish)

138

Analysis, occurrence and fate of MTBE in the aquatic environment over the past decade

Rosell Linares, Mònica; Lacorte Bruguera, Silvia; Barceló, Damià
2006-10-02

Digital.CSIC (Spain)

139

Analysis and removal of emerging contaminants in wastewater and drinking water

Petrovic, Mira; González Blanco, Susana; Barceló, Damià
2003-11-01

Digital.CSIC (Spain)

140
141

Adsorption of Water on O(2 × 2)/Ru(0001): Thermal Stability and Inhibition of Dissociation

Mugarza, Aitor ; Shimizu, Tomoko K. ; Cabrera-Sanfélix, Pepa ; Sánchez-Portal, Daniel ; Arnau, Andrés ; Salmerón, Miquel

6 pages, 5 figures.-- Printed version published on Sep 11, 2008.-- After a citation change in the Results section, the revised (e-)paper was reposted on Aug 19th. | The effect of preadsorbed oxygen on the subsequent adsorption and reactions of water on Ru(0001) has been studied using low temperature...

DRIVER (Spanish)

142

Adsorption of Water on O(2 × 2)/Ru(0001): Thermal Stability and Inhibition of Dissociation

Mugarza, Aitor; Shimizu, Tomoko K.; Cabrera-Sanfélix, Pepa; Sánchez-Portal, Daniel; Arnau, Andrés; Salmerón, Miquel
2008-08-08

Digital.CSIC (Spain)

143

Activity of grape polyphenols as inhibitors of the oxidation of fish lipids and frozen fish muscle

Pazos, Manuel; Gallardo, José Manuel; Torres, Josep Lluís; Medina, Isabel
2005-09-01

Digital.CSIC (Spain)

145

A comparison between bark extracts from Pinus pinaster and Pinus radiata: Antioxidant activity and procyanidin composition

Jerez, María; Selga, Ariadna; Sineiro, Jorge; Torres, Josep Lluís; Núñez, María José
2005-11-29

Digital.CSIC (Spain)