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Search Results: 1 - 10 of 31159 matches for " Andreina Z. Figuera Leonett "
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Photobioreactor of Microalgas for CO2 Biofixation  [PDF]
Yordanka Reyes Cruz, Gisel Chenard Díaz, Andreina Z. Figuera Leonett, René Gonzalez Carliz, Vinicius Rossa, Luciano Basto Oliveira, Maurílio Novais da Paix?o, Donato Alexandre Gomes Aranda
Journal of Power and Energy Engineering (JPEE) , 2019, DOI: 10.4236/jpee.2019.71006
Abstract: Microalgae are unicellular organisms capable of photosynthesis, turning sunlight and carbon dioxide (CO2) into rich biomass. Precisely because of this definition, in recent years various sectors have been targeting their ability to reduce CO2 emissions and the capacity of simultaneously synthesize biomass which can be later used to produce bio-fuels. Besides being considered fast-growth microorganisms, microalgae have a diverse biochemical composition with similar characteristics to traditional biomass. In this context, the present work aimed to evaluate the biofixation of CO2 by the microalgae Monoraphidium sp., cultivated in a closed-window type photobioreactor, as well as characterization of microalgal biomass produced in relation to the total lipid content (TL), lipids converted into biodiesel (LCB), carbohydrates and proteins. The results achieved showed that the best result was obtained after 24 h of cultivation, where for each gram of biomass produced approximately 1.2 g of CO2 were consumed. In the growth phase the average biomass productivity in the Janela photobioreactor was 58 mg·L-1·day-1 concluding that microalgae culture systems could be coupled to the chimneys of large industries emitters CO2 using this gas, resulting from combustion processes, in the process of photosynthesis. The biomass Monoraphidium sp. produced had a content of lipids converted into biodiesel of approximately 8.36% ± 2.69%, carbohydrates 32% ± 3.37% and proteins 34.26% ± 0.41%.
Bio-Oil Extracted of Wet Biomass of the Microalga Monoraphidium sp. for Production of Renewable Hydrocarbons  [PDF]
Yordanka R. Cruz, Gisel Ch. Díaz, Viviane de S. Borges, Andreina Z. F. Leonett, René G. Carliz, Vinicius Rossa, Vitor M. E. S. Silva, Carolina Vieira Viegas, Donato A. G. Aranda, Luciano B. Oliveira
Journal of Power and Energy Engineering (JPEE) , 2019, DOI: 10.4236/jpee.2019.71005
Abstract: Renewable hydrocarbons refer to fuels consisting of hydrocarbons of 10 to 20 carbon atoms, produced from biomass, and free of oxygen. Hydrocracking, hydrodeoxygenation and hydrotreatment processes for the production of renewable hydrocarbons are described in the literature. Microalgae have been targeted in recent years to synthesize biomass that can be used in the production of biofuels, such as renewable hydrocarbons, biodiesel or ethanol second generation. In this context the lineage Monoraphidium sp. was selected from previous ecophysiological studies and its potential to produce lipids to develop this research related with the extraction of the bio-oil of the wet biomass of Monoraphidium sp. through heat treatment. Consecutively the bio-oil was used as raw material for the production of hydrocarbons through hydrocracking and hydrodeoxygenation processes (HDO) as: decarbonylation, decarboxylation, dehydratation, with in situ production of hydrogen from liquid-phase reforming of glycerol. The reactions were carried out under two different temperature conditions, 350°C and 300°C, respectively, for 1 h and using ruthenium alumina catalyst (Ru/Al2O3). The results showed the bio-oil processing route at a temperature of 350°C promising for the production of hydrocarbons achieving a conversion of 81.54%.
Diarrhea due to Cyclospora-like organism in an immunocompetent patient
Mairelina Marín-Leonett,1,2 Lourdes Figuera,1 Anaibeth Nessi,2 Carmen Guzmán,2Patricia Torres,3 Linda Genzlinger,3 Geraldine Saavedra,3Mairalina Marín-Leonett,1 Ynés R. Ortega.3
Journal of Infection in Developing Countries , 2007,
Abstract: Cyclospora cayetanensis infection continues to be a major cause of diarrhea particularly in immunosuppressed patients. The emergence of new related parasite pathogens, is an issue of public health concern. We report here a case where a Cyclosporalike organism was the cause of diarrhea in an immunocompetent patient from Venezuela.
Nuevas direcciones en la patogénesis y tratamiento de la Nefropatía diabética
Onelia Orence Leonett
Revista Venezolana de Endocrinología y Metabolismo , 2004,
Rese a de "Gendered Paradoxes:Women′s Movements, State Restructuring, and Global Development in Ecuador" de Amy Lind
Torres , Andreina
Iconos : Revista de Ciencias Sociales , 2006,
Influence of H-Type and L-Type Activated Carbon in the Photodegradation of Methylene Blue and Phenol under UV and Visible Light Irradiated TiO2  [PDF]
Juan Matos, Karina Quintana, Andreina García
Modern Research in Catalysis (MRC) , 2012, DOI: 10.4236/mrc.2012.11001
Abstract: Photodegradation of methylene blue (MB) and phenol (Ph) on TiO2 in presence of H-type and L-type activated carbons (AC) was studied. Photodegradation of MB and Ph were studied under two different lamps and results were compared against those obtained on a commercial TiO2. Apparent first order rate constant for the degradation of MB was higher in presence of any AC in comparison of TiO2 alone while only in presence of ACco2-800phenol was photodegradated in shorter irradiation time than that required by TiO2. It can be concluded that TiO2 enhances its photoactivity by a factor up to 8.7 in the degradation of MB in presence of AC and this effect is associated to the specific surface properties of AC.
“Under the sign of the Eagle”. German war memorials and cemeteries (1911-1945) “Sotto il segno dell’Aquila”. Sacrari e cimiteri di guerra tedeschi (1911-1945)
Andreina Maahsen-Milan
In_Bo : Ricerche e Progetti per il Territorio, la Città e l'Architettura , 2012, DOI: 10.6092/issn.2036-1602/3259
Abstract: Wilhelm Kreis (1873-1955) was a prominent architect and prestigious professor. He directed and conditioned choices while being ambiguously on the margins of political activity, he dominated the architectural scene for almost five decades. Kreis took part in and to a certain extent directed, as architect and master, part of major events in architectural and urban planning that involved the biggest German cities up to the fall of the Third Reich. Together with Bonatz, Behrens, Tessenow, Kreis can be considered one of the most influential and unparalleled leaders in German architectural culture - prophet of spirituality and watchman of values from Deutschtum, initially embodied by the Prussian Reich, and subsequently by the Third Reich. His contribution – combining themes and shapes taken from historical tradition – only partially qualifies him as a figure still linked to the ideological cornerstones of the second half of the 19th century. Wilhelm Kreis (1873-1955) fu un celebre architetto e un noto professore. Pur mantenendosi ambiguamente ai margini dell'attività politica, diresse e condizionò scelte importanti e dominò la scena dell'architettura tedesca per quasi cinque decadi. Kreis prese parte come architetto e maestro ai più importanti eventi nell'architettura e nell'urbanistica che coinvolsero le maggiori città tedesche fino alla caduta del Terzo Reich. Con Bonatz, Behrens, Tessenow, Kreis può essere considerato una delle guide più influenti della cultura architettonica tedesca, profeta della spiritualità tedesca e guardiano dei valori della Germanicità inizialmente rappresentati dal Regime prussiano e poi dal Terzo Reich. Il suo contributo – miscelando forme e temi presi dalla tradizione storica – solo parzialmente lo qualifica come una figura ancora legata ai principali assi ideologici della seconda metà del secolo XIX.
Felis concolor
Andreina Agüero
Multequina , 1994,
Colección Ciudadanía y Violencias
Andreina Torres Angarita
EURE (Santiago) , 2008,
Ordenación del territorio en Venezuela: incoherencias y contradicciones actuales
Salas Bourgoin,María Andreina;
Cuadernos del Cendes , 2011,
Abstract: land-use planning in venezuela represents a public policy and administrative practice presently weakened by a set of problems whose solution is one of the keys for development at the national level. this becomes evident when carefully comparing the ?must be? in this context, set down in laws and management instruments, with the ?is? or current situation. how to support such a statement? with the evidences that show that the decisions made and the actions implemented are inconsistent with that ?must be?. consequently, this paper focuses on the search for those evidences and on demonstrating that the venezuelan land-use planning is currently marked by incoherence and contradiction.
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