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Search Results: 1 - 10 of 20089 matches for " Teresa Torres-Blancas "
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Ozonation of Indigo Carmine Catalyzed with Fe-Pillared Clay
Miriam Bernal,Rubí Romero,Gabriela Roa,Carlos Barrera-Díaz,Teresa Torres-Blancas,Reyna Natividad
International Journal of Photoenergy , 2013, DOI: 10.1155/2013/918025
Abstract: The ozonation catalyzed by iron-pillared clays was studied. The degradation of dye indigo carmine (IC) was elected as test reaction. Fe-pillared clays were synthesized by employing hydrolyzed FeCl3 solutions and bentonite. The pillared structure was verified by XRD and by XPS the oxidation state of iron in the synthesized material was established to be +2. By atomic absorption the weight percentage of iron was determined to be 16. The reaction was conducted in a laboratory scale up-flow bubble column reactor. From the studied variables the best results were obtained with a particle size of 60 microns, , ozone flow of 0.045?L/min, and catalyst concentration of 100?mg/L. IC was completely degraded and degradation rate was found to be double when using Fe-PILCS than with ozone alone. DQO reduction was also significantly higher with catalyzed than with noncatalyzed ozonation. 1. Introduction A vast amount of water is employed by the textile industry. Because of the dyeing process, the produced wastewater contains strong color and this is reflected as well in a high chemical oxygen demand (COD). It has been estimated that 1–15% of the dye is lost during dyeing and finishing processes and is released into wastewater [1, 2]. Even small quantities (<0.005?mg?L?1) of dyes in water are unacceptable since the discharge of effluents containing reactive dyes into the environment can interfere with transmission of sunlight into flowing liquid [3]. This causes perturbations in aquatic life and the food web [4]. Thus, an effective and economical technique for removing dyes from textile wastewaters is needed [5]. In this sense, several conventional methods for treating dye effluents have been studied, such as photodegradation [6], adsorption [7], filtration [8], coagulation [9], and biological treatments [10]. However, due to the stability of the molecules of dyes some of these methods are not completely effective and/or viable. In recent years, water treatment based on the chemical oxidation of organic compounds by advanced oxidation processes (AOPs) like ozonation has drawn attention. Ozonation, which is effective, versatile, and environmentally sound, has been tested as a good method for color removal [11]. Ozone is a strong oxidant and reacts rapidly with most of organic compounds [12]. It oxidizes organic pollutants via two pathways: direct oxidation with ozone molecules and/or the generation of free-radical intermediates, such as the radical, which is a powerful, effective, and nonselective oxidizing agent [13, 14]. However, the degree and rate of oxidation by
Neonatal Nutrition and Later Outcomes of Very Low Birth Weight and Preterm Infants <32 Gestational Age at a Tertiary Care Hospital of Portugal  [PDF]
Concei??o Costa, Teresa Torres, Andreia Teles
Open Journal of Pediatrics (OJPed) , 2015, DOI: 10.4236/ojped.2015.53029
Abstract: Premature infants, especially those born with less than 1500 g, often exhibit slow overall growth. Lack of early nutritional support is an important element. The present authors describe parenteral nutritional practices in a tertiary hospital and evaluate postnatal growth of preterm infants under 32 weeks of gestational age or with a birth weight < 1500 g. For population study, we examined 431 newborn files. Their median gestational age was 29.7 weeks. Of them, 25.4% were small for gestational age (SGA). 77.5% received parenteral nutrition (PN), 54.5% of which was provided on the first day. The average time was 14.7 days. The average weight gain by the 30th day was 425 g. At discharge, 37% were rd month 20% had their weight under P3, decreasing to 10% by the 12th month. Children who initiated PN in the first 24 hours of life had significantly better weight on the 30th day of their life (p < 0.001) and in the 6th month of corrected age (p = 0.038). And they had better Body Mass Index (BMI) in the 3rd (p = 0.012) and 12th (p = 0.023) months. Despite better feeding practices, there is still significant failure in post natal growth. Early introduction of PN was associated with an improved weight gain, which suggests that nutrition that included amino acids may be critical during the first 24 hours of life.
POLEN FóSIL DE ISLA REY JORGE (ANTáRTICA) Y CHILE CONTINENTAL, AFIN A PROTEACEAE CHILENAS
Hebel,Ingrid; Torres,Teresa;
Anales del Instituto de la Patagonia , 2009, DOI: 10.4067/S0718-686X2009000100002
Abstract: the morphology of fossil pollen from sedimentary, tertiary rocks on fildes península, king george island, south shetland islands, antárctica and from two locations on continental chile was studied. the grains were identified, described and compared with current chilean proteaceae. eight of the fossils forms belonged to the genus proteacidites three to propylipollis and two to triorites. those pollen forms with af finity to current species come mainly in miocene sediments from continental chile and from the upper eocene from king george island. affinity was established for propylipollis concretus and proteacidites pseudomoides with gemina avellane; proteacidites aff callosus and propylipollis sp. 1 with lomatia hirsuta; proteacidites aff callosus, proteacidites cj. subscabratus and proteacidites harrisii with orites myrtoidea; and propylipollis microverrucatus with lomatia ferruginea. none of the rest are current species of proteaceae.
Nuevas especies de Agathoxylon y Baieroxylon del Lías de La Ligua (Chile) con una evaluación del registro paleoxilológico en el Jurásico de Sudamérica
Torres,Teresa; Philippe,Marc;
Revista geológica de Chile , 2002, DOI: 10.4067/S0716-02082002000200001
Abstract: new species of coniferales and ginkgoales from the lias of la ligua (chile) with an evaluation of paleoxylological record in the jurassic of south america. fossil wood from quebrada del pobre formation (sinemurian) was found northeast of la ligua (71°13'w-32°24's), v region, chile. the anatomical study allowed to determine two new species: agathoxylon liguaensis sp. nov. and baieroxylon chilense sp. nov. baieroxylon, belonging to the ginkgoales, is described for the first time on the continent and increases to six the number of morphogenera recognized in the jurassic of south america. the wide annual rings of the taxons studied show that the plants grew under very favorable environmental conditions, in a warm paleoclimate with low temperature fluctuations
POLEN FóSIL DE ISLA REY JORGE (ANTáRTICA) Y CHILE CONTINENTAL, AFIN A PROTEACEAE CHILENAS FOSSIL POLLEN ON KING GEORGE ISLAND (ANTARCTICA) AND CONTINENTAL CHILE WITH AFFINITY TO CURRENT CHILEAN PROTEACEAE
Ingrid Hebel,Teresa Torres
Anales del Instituto de la Patagonia , 2009,
Abstract: Se realizó un estudio morfológico de palinomorfos fósiles provenientes de rocas sedimentarias terciarias de la península Fildes, isla Rey Jorge, archipiélago de las Shetland del Sur, Antartica y de dos localidades terciarias de Chile continental. El objetivo es la identificación y descripción de los granos de polen fósil, así como la comparación con las Proteaceae chilenas. De las formas fósiles afines a Proteaceae, ocho pertenecen a Proteacidites, tres a Propylipollis y dos a Triorites. Los palinomorfos afines a especies actuales provienen, principalmente, de sedimentos del Mioceno de Chile continental y del Eoceno Superior de la isla Rey Jorge, Antartica. Se establecen las afinidades de Propylipollis concretus y Proteacidites pseudomoides con Gevuina avellana; Proteacidites aff callosus y Propylipollis sp.l con Lomatia hirsuta; Proteacidites aff callosus, Proteacidites cf subscabratus y Proteacidites harrisii con Orites myrtoidea; y Propylipollis microverrucatus con Lomatia ferruginea. El resto no serían afines a ninguna especie actual de Proteaceae. The morphology of fossil pollen from sedimentary, tertiary rocks on Fildes Península, King George Island, South Shetland Islands, Antárctica and from two locations on continental Chile was studied. The grains were identified, described and compared with current Chilean Proteaceae. Eight of the fossils forms belonged to the genus Proteacidites three to Propylipollis and two to Triorites. Those pollen forms with af finity to current species come mainly in Miocene sediments from continental Chile and from the Upper Eocene from King George Island. Affinity was established for Propylipollis concretus and Proteacidites pseudomoides with Gemina avellane; Proteacidites aff callosus and Propylipollis sp. 1 with Lomatia hirsuta; Proteacidites aff callosus, Proteacidites cj. subscabratus and Proteacidites harrisii with Orites myrtoidea; and Propylipollis microverrucatus with Lomatia ferruginea. None of the rest are current species of Proteaceae.
Nuevas especies de Agathoxylon y Baieroxylon del Lías de La Ligua (Chile) con una evaluación del registro paleoxilológico en el Jurásico de Sudamérica
Teresa Torres,Marc Philippe
Revista geológica de Chile , 2002,
Abstract: Se estudiaron maderas fósiles de edad sinemuriana, provenientes de estratos de la Formación Quebrada del Pobre, que afloran al noreste de la ciudad de La Ligua (71°13'W; 32°24'S), V Región, Chile. El análisis xilotómico permitió distinguir dos nuevas morfoespecies: Agathoxylon liguaensis sp. nov. y Baieroxylon chilense sp. nov. El registro, en este trabajo, de Baieroxylon, perteneciente a las Ginkgoales, amplía a seis el número de morfogéneros reconocidos en el Jurásico de Sudamérica. El ancho de los anillos anuales de los taxones estudiados indica que los árboles crecieron en condiciones ambientales muy favorables, en un paleoclima cálido con bajas fluctuaciones de temperatura New species of Coniferales and Ginkgoales from the Lias of La Ligua (Chile) with an evaluation of paleoxylological record in the Jurassic of South America. Fossil wood from Quebrada del Pobre Formation (Sinemurian) was found northeast of La Ligua (71°13'W-32°24'S), V Region, Chile. The anatomical study allowed to determine two new species: Agathoxylon liguaensis sp. nov. and Baieroxylon chilense sp. nov. Baieroxylon, belonging to the Ginkgoales, is described for the first time on the continent and increases to six the number of morphogenera recognized in the Jurassic of South America. The wide annual rings of the taxons studied show that the plants grew under very favorable environmental conditions, in a warm paleoclimate with low temperature fluctuations
Flexiseguridad, derecho al trabajo y estabilidad laboral
Carlos Blancas
Derecho PUCP , 2012,
Abstract: Flexisecurity, right to work and labor stability This article deals with one of the most recent and innovative proposals of related flexibilization, basically, to the extinction of labor relation and that areknown as flexisecurity or flexicurity . For this, the author comments the model of Denmark – country in which it’s originated flexisecurity – emphasizing the configuration of a golden triangle , composed of: i) flexibility in the labor relation, aimed at facilitating the dismissal ii) a generous system of unemployment benefits, funded primarily by the State and iii) a new policy of activation of the labor market, which seeks to keep large sectors of the population permanently trained to meet new labor challenges. The author emphasizes the difference between our country and Denmark, since it is a Welfare State with a high level of social protection funded by a fiscal pressure and high tax rates. Finally, the article notes that for the study of flexisecurity it shouldn’t ignore the legal framework derived from workers’ fundamental rights established in the Constitution and international treaties which imply: right to work, dignity and citizenship of the worker and Trade Union Freedom and Collective Rights El artículo aborda una de las más recientes y novedosas propuestas de flexibilización relacionada, básicamente, con la extinción de la relación laboral, propuesta que es conocida como flexiseguridad o flexiguridad . Para ello, el autor comenta el modelo de Dinamarca —país en el que se origina la flexiseguridad — destacando la configuración de un triángulo dorado , integrado por: i) la flexibilidad en la relación de trabajo, destinado a facilitar el despido; ii) un sistema generoso de prestaciones por desempleo, financiado fundamentalmente por el Estado; y iii) una nueva política de activación del mercado de trabajo que busca mantener a grandes sectores de la población permanentemente capacitados para afrontar nuevos retos laborales. El autor recalca la diferencia entre nuestro país y Dinamarca, pues se trata de un Estado de Bienestar, con un elevado nivel de protección social financiado gracias a una presión fiscal y tasas impositivas altas. Finalmente, el artículo se ala que para el estudio de la flexiseguridad no se debe omitir el marco normativo derivado de los derechos fundamentales del trabajador establecidos en la Constitución y los tratados internacionales que implica: el derecho al trabajo, la dignidad y ciudadanía del trabajador y la Libertad Sindical y los Derechos Colectivos.
Empleo de los ensayos con plantas en el control de contaminantes tóxicos ambientales
Torres Rodríguez,Marina Teresa;
Revista Cubana de Higiene y Epidemiolog?-a , 2003,
Abstract: the increasing industrial and urban development has brought about the appearance of a considerable number of toxic chemicals, which affect not only human health, but that of the ecosystems in developed and developing countries, too. rapid bioassays have been implemented with the use of plants as testing organisms that work as good tools in the initial screening. the advantages of the plants to be incorporated in batteries of assays in the detection and control of the environmental toxic pollutants are stressed. reference is made to two of the bioassays with plants that may be useful and available in the toxicological evaluation of environmental samples.
Empleo de los ensayos con plantas en el control de contaminantes tóxicos ambientales
Marina Teresa Torres Rodríguez
Revista Cubana de Higiene y Epidemiología , 2003,
Abstract: El creciente desarrollo industrial y urbano ha traído consigo la aparición de una cantidad apreciable de sustancias químicas tóxicas, lo cual afecta tanto la salud humana como la de los ecosistemas en países desarrollados y en vías de desarrollo. Recientemente se han instrumentado bioensayos rápidos con el empleo de plantas como organismos de prueba, los que funcionan como buenas herramientas de pesquisa inicial. Se se alan las ventajas que tienen las plantas para ser incorporadas en baterías de ensayo para medir alarma de peligro ambiental. Se destaca la importancia del empleo de bioensayos con plantas en la detección y control de los contaminantes tóxicos ambientales. Se hace referencia a dos de los bioensayos con plantas que pueden resultar disponibles y de utilidad en la evaluación toxicológica de muestras ambientales. The increasing industrial and urban development has brought about the appearance of a considerable number of toxic chemicals, which affect not only human health, but that of the ecosystems in developed and developing countries, too. Rapid bioassays have been implemented with the use of plants as testing organisms that work as good tools in the initial screening. The advantages of the plants to be incorporated in batteries of assays in the detection and control of the environmental toxic pollutants are stressed. Reference is made to two of the bioassays with plants that may be useful and available in the toxicological evaluation of environmental samples.
CIENCIA DE LA INFORMACIóN Y GESTIóN DEL CONOCIMIENTO
Maria Teresa Múnera Torres
Perspectivas em Gest?o & Conhecimento , 2012,
Abstract: RESUMEN: Se presenta una aproximación a lo que se concibe como Ciencia de la Información y Gestión del Conocimiento, para luego establecer algunas relaciones que se aprecian en la dinámica de ambas áreas del saber y en especial en el ámbito del desempe o bibliotecológico, para culminar con unas conclusiones sobre los temas abordados. ABSTRACT: It presents an approximation of what is conceived as the Information Science and Knowledge Management, in order to establish some relationships that are appreciated in the dynamics of both dimensions of knowledge and especially in the area of the librarianship performance, to culminate with a few conclusions about the topics being addressed.
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