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Search Results: 1 - 10 of 12650 matches for " VANESSA RUIZ "
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EFECTO DEL CONTENIDO DE SODIO EN LA OBTENCIóN DE Na+-b-ALúMINA UTILIZANDO EL MéTODO DE PRECURSOR POLIMéRICO
RUIZ,VANESSA; RODRIGUEZ,JORGE;
DYNA , 2011,
Abstract: in this work was utilized the polymeric precursor method to synthesis ceramic powders of na+-b-alúmina. we were interested in determinate the initial quantity from sodium precursor and its effect on crystalline phase obtained. powders obtained were characterized using infrared spectroscopy (ftir), x-ray diffraction (xrd) and scanning electron microscopy (sem). the effect of the initial quantity of sodium in the sample was very important in the nature of the final product. if we used one stoichiometric quantity of naoh, to obtain naal11o17 compound, we obtained a-alúmina as finish product (1450oc). on the other hand, b-alúmina and/or na2al2xo3x-1 were obtained in samples treated thermicalment from 1000oc to 1350oc. when we used a higher quantity of naoh, sample non-stoichiometric, a solid with naal11o17 as majority phase was obtained.
EFECTO DEL CONTENIDO DE SODIO EN LA OBTENCIóN DE Na+ -B-ALúMINA UTILIZANDO EL MéTODO DE PRECURSOR POLIMéRICO
VANESSA RUIZ,JORGE RODRIGUEZ
DYNA , 2011,
Abstract: En este trabajo se muestran los resultados obtenidos al emplear el metodo de precursor polimerico (Pechini) para sintetizar polvos ceramicos de Na + B àalumina, utilizando sales inorganicas, tomando como parametro de estudio la cantidad inicial del precursor de sodio y su efecto sobre la fase cristalina obtenida al final del proceso. Los polvos fueron caracterizados utilizando espectroscopia Infrarroja (FTIR), Difraccion de Rayos X (DRX) y Microscopia Electronica de Barrido (MEB). Se encontro que el efecto de la cantidad de sodio inicial en la muestra es determinante en la naturaleza del producto final obtenido. Utilizando la cantidad estequiometrica de NaOH requerida, para la obtencion del compuesto NaAl11O17, se obtuvo al final del proceso (1450oC) a-alumina y B-alumina y/o Na2Al2xO3x1 en muestras tratadas termicamente entre 1000oC y 1350oC. Cuando se uso una mayor cantidad de NaOH, muestra no estequiometrica, se obtuvo un solido con el compuesto NaAl11O17 como fase mayoritaria.
Educa??o em saúde para portadores de doen?a mental: relato de experiência
Ruiz, Vanessa Romeiro;Lima, Alessandra Ribeiro;Machado, Ana Lúcia;
Revista da Escola de Enfermagem da USP , 2004, DOI: 10.1590/S0080-62342004000200010
Abstract: the account in this text refers to an effective health education project in a mental health post in sao paulo for which nursing department students are responsible. the belief in the mentally ill person conquering rights as citizens as well as understanding that the education may become the individual's most valuable emancipation tools were the starting point of the project. there was a short phase as well as a long one, both of which occurred in the weekly open group format to users and their family members, and whose characteristics were free participation, since the space was open for discussion and the exchange of both opinions and experiences. the themes were chronic illnesses, and those highlighted ones were mental illnesses, communicable diseases and chronic degenerative-illnesses.
Factors that determine food selection in vulnerable women of the Municipality of Talcahuano
Claudia Troncoso Pantoja,Vanessa Céspedes Cantillana,Paulina Cifuentes Ruiz
Medwave , 2011,
Abstract:
Aluminatos de sodio obtenidos del sistema Al(NO3)3 • 9H2O - NaOH a través del método de precipitación controlada
Ruiz Madro?ero,Christhy Vanessa; Rodríguez Paéz,Jorge Enrique;
Ingeniería e Investigación , 2010,
Abstract: sodium aluminate, naalo2? xh2o, is an important comercial chemical used in water treatment, as a source of aluminium in the preparation of zeolites and other catalytic materials and as an additive in paper manufacturing. sodium aluminates were synthesised in this work by using the al(no3)3 ? 9h2o- naoh system's controlled precipitation method. using the controlled precipitation method enabled identifying the process's different stages from potentiometric titration of al(no3)3 ? 9h2o dissolved in water and using naoh as precipitating agent to ensure control and reproducibility and also identify final product characteristics. powders were characterised by infrared spectroscopy (ftir), x-ray diffraction (xrd) and gravimetric and differential thermal analysis (gdta). the results indicated that naalo2 crystallised well at 1,000°c (obtained as the main crystalline sodium aluminate phase) and that β-alumina treatment began to form at 1,500°c.
Farmacologia e Toxicologia de Peumus boldus e Baccharis genistelloides
Ruiz, Ana Lúcia T. G.;Taffarello, Denise;Souza, Vanessa H. S.;Carvalho, Jo?o E.;
Revista Brasileira de Farmacognosia , 2008, DOI: 10.1590/S0102-695X2008000200025
Abstract: there are a great number of medicinal plants without any scientific confirmation about their efficacy and safety. this paper is a short review about two medicinal plants, "boldo do chile" (peumus boldus) and "carqueja" (baccharis genistelloides). pharmacological studies have confirmed several popular indications for p. boldus and b. genistelloides, besides have established a relationship between isolated compounds from these extracts and the pharmacological effects observed. on the other hand, toxicological researches have pointed out that p. boldus tea should not be consumed during a long period (potential hepatotoxicity) and by pregnant, especially during the first three months. moreover, b. genistelloides tea must be prohibited for pregnant because of confirmed abortive action, and for patients using medicines for blood pressure disorders. these studies point out the continuous necessity of more studies about medicinal plants; only with this knowledge it will be possible a safe and efficient use.
Monitoring coral reefs, seagrasses and mangroves in Costa Rica (CARICOMP)
Jorge Cortés,Ana C Fonseca,Jaime Nivia-Ruiz,Vanessa Nielsen-Mu?oz
Revista de Biología Tropical , 2010,
Abstract: The coral reefs, seagrasses and mangroves from the Costa Rican Caribbean coast have been monitored since 1999 using the CARICOMP protocol. Live coral cover at Meager Shoal reef bank (7 to 10m depth) at the Parque Nacional Cahuita (National Park), increased from 13.3% in 1999, to 28.2% in 2003, but decreased during the next 5 years to around 17.5%. Algal cover increased significantly since 2003 from 36.6% to 61.3% in 2008. The density of Diadema antillarum oscillated between 2 and 7ind/m2, while Echinometra viridis decreased significantly from 20 to 0.6ind/m2. Compared to other CARICOMP sites, live coral cover, fish diversity and density, and sea urchin density were low, and algal cover was intermediate. The seagrass site, also in the Parque Nacional Cahuita, is dominated by Thalassia testudinum and showed an intermediate productivity (2.7±1.15 g/m2/d) and biomass (822.8±391.84 g/m2) compared to other CARICOMP sites. Coral reefs and seagrasses at the Parque Nacional Cahuita continue to be impacted by high sediment loads from terrestrial origin. The mangrove forest at Gandoca, within the Refugio Nacional de Vida Silvestre Gandoca-Manzanillo (National Wildlife Refuge), surrounds a lagoon and it is dominated by the red mangrove, Rhizophora mangle. Productivity and flower production peak was in July. Biomass (14kg/m2) and density (9.0±0.58 trees/100m2) in Gandoca were relatively low compared to other CARICOMP sites, while productivity in July in Costa Rica (4g/m2/d) was intermediate, similar to most CARICOMP sites. This mangrove is expanding and has low human impact thus far. Management actions should be taken to protect and preserve these important coastal ecosystems. Rev. Biol. Trop. 58 (Suppl. 3): 1-22. Epub 2010 October 01. Los arrecifes coralinos, pastos marinos y manglares de la costa Caribe de Costa Rica han sido monitoreados desde 1999 siguiendo el protocolo de CARICOMP. La cobertura de coral vivo en el arrecife de Meager Shoal (7 a 10m de profundidad) en el Parque Nacional Cahuita, aumentó de 13.3% en 1999, a 28.2% en 2003, pero después bajó, por los siguientes 5 a os, a aproximadamente 17.5%; la cobertura de algas aumentó significativamente de 36.6% en 2003 a 61.3% en 2008. La densidad de Diadema antillarum osciló entre 2 y 7 ind/m2 mientras que Echinometra viridis decreció significativamente de 20 a 0.6 ind/m2. Comparado con otros sitios CARICOMP, la cobertura de coral vivo, diversidad y densidad de peces, y densidades de erizos de mar fueron bajas y la cobertura algal intermedia. El sitio de pastos marinos, también en el Parque Nacional Cahuita, e
Aluminatos de sodio obtenidos del sistema Al(NO3)3 9H2O — NaOH a través del método de precipitación controlada Sodium aluminates obtained from the Al(NO3)3 9H2O — NaOH system using the controlled precipitation method
Ruiz Madro?ero Christhy Vanessa,Rodríguez Páez Jorge Enrique
Ingeniería e Investigación , 2010,
Abstract: Los aluminatos de sodio, NaAlO2 xH2O, son materiales que se utilizan en el tratamiento del agua, como fuente de a- luminio en la preparación de zeolitas y otros materiales cata- líticos, así como aditivo en la manufactura del papel. En este trabajo se presentan los resultados obtenidos al sintetizar alu- minatos de sodio por el método de precipitación controlada utilizando como precursor el Al(NO3)3 9H2O. El uso del método de precipitación controlada permitió, a partir de la valoración potenciométrica del Al(NO3)3 9H2O disuelto en agua y empleando como precipitante NaOH, determinar las diferentes etapas del proceso para garantizar el control y su reproducibilidad, así como las características del producto fi- nal. También se presenta una propuesta sobre el mecanismo de formación de las partículas en el seno de la solución, así como los resultados del efecto del tratamiento térmico sobre (GDTA). Las fases cristalinas presentes en el sólido. La caracterización de los polvos obtenidos se realizó utilizando espectroscopia infrarroja (FTIR), difracción de rayos X (DRX) y análisis térmico (ATD/TG). Los resultados indican que a 1.000 °C se obtiene como principal fase cristalina aluminato de sodio, NaAlO2, bien cristalizado, y que para tratamientos a 1.500 °C la β-a- lúmina comienza a formarse. Sodium aluminate, NaAlO2 xH2O, is an important comer- cial chemical used in water treatment, as a source of alumi- nium in the preparation of zeolites and other catalytic mate- rials and as an additive in paper manufacturing. Sodium alu- minates were synthesised in this work by using the Al(NO3)3 9H2O- NaOH system’s controlled precipitation method. Using the controlled precipitation method enabled identifying the process’s different stages from potentiometric titration of Al(NO3)3 9H2O dissolved in water and using NaOH as precipitating agent to ensure control and reproducibility and also identify final product characteristics. Powders were characterised by infrared spectroscopy (FTIR), X-ray diffraction (XRD) and gravimetric and differential thermal analysis. The results indicated that NaAlO2 crystallised well at 1,000°C (obtained as the main crystalline sodium aluminate phase) and that β-alumina treatment began to form at 1,500°C.
Ubicación anatómica, identificación histológica y preservación de las glándulas paratiroides durante la tiroidectomía
Ruiz Higuera,José Guaicaipuro; Colmenares Arreaza,Guillermo; Calderaro di Ruggiero,Franco J.; Szczedrin Pinzón,Vanessa Valentina;
Gaceta Médica de Caracas , 2004,
Abstract: a study of 13 patients with thyroid patology was carried out, to which thyroidectomy subtotal or lobectomy were practiced in the service of general surgery of the hospital risquez of caracas during the year 2000. the objective was to locate anatomically, to identify histologically and to preserve the parathyroid glands during the thyroidectomy. a total of 27 glands, were located: 25 (92.6 %) in its normal anatomical position, while 2 (7.4 %) they weren?t. per-operative biopsy was practiced to the 27 parathyroids, being these identified histologically in 100 % of the cases. we concludes that the location of the parathyroid glands for the surgeon during the thyroidectomy is of great importance, as well as being familiarized with the macroscopic characteristics, since in this way they can be preserved during the surgical act to avoid severe complications.
Elongated cells of Listeria monocytogenes in biofilms in the presence of sucrose and bacteriocin-producing Leuconostoc mesenteroides A11
Ratti, Regiane Priscilla;Gomes, Bruna Carrer;Martinez, Rafael Chacon Ruiz;Souza, Vanessa Maciel;Martinis, Elaine Cristina Pereira De;
Ciência e Tecnologia de Alimentos , 2010, DOI: 10.1590/S0101-20612010000400027
Abstract: listeria monocytogenes is a foodborne pathogen which may survive in biofilms and persist in food processing plants. in this study, the ability of leuconostoc mesenteroides (bac+ and bac-) to inhibit biofilm formation by l. monocytogenes atcc 19115 was studied with stainless steel coupons immersed in bhi broth and bhi broth plus sucrose in combination with the lactic acid bacteria (lab). adhered cells were collected with swabs and enumerated on selective agars (oxford for listeria and mrs for leuconostoc). leuconostoc mesenteroides bac+ in co-culture with l. monocytogenes was effective to inhibit biofilm formation by listeria for up to 3 hours of incubation, but at 24 hours, biofilm was present in all conditions tested, as confirmed by observations of stainless steel coupons under scanning electron microscopy (sem). it was also observed that in the presence of l. mesenteroides bac+ in bhi plus sucrose, a high number of elongated cells of l. monocytogenes was present, which may indicate an adaptation response of the pathogen to stress conditions with important implications for food safety.
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