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Search Results: 1 - 10 of 138564 matches for " Carolina V. Viegas "
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Microalgae Lipid and Biodiesel Production: A Brazilian Challenge  [PDF]
Carolina T. Miranda, Roberta F. Pinto, Daniel V. N. de Lima, Carolina V. Viegas, Simone M. da Costa, Sandra M. F. O. Azevedo
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.615254
Abstract: Global increases in atmospheric CO2 and climate change are drawing considerable attention to identify sources of energy with lower environmental impact than those currently in use. Biodiesel production from microalgae lipids can, in the future, occupy a prominent place in energy generation because it represents a sustainable alternative to petroleum-based fuels. Several species of microalgae produce large amounts of lipids per biomass unit. Triacylglycerol is the fatty acid used for biodiesel production and the main source of energy reserves in microalgae. The current literature indicates that nutrient limitations can lead to triacylglycerol accumulation in different species of microalgae. Further efforts in microalgae screening for biodiesel production are needed to discover a native microalgae that will be feasible for biodiesel production in terms of biomass productivity and oil. This revision focuses in the biotechnological potential and viability of biodiesel production from microalgae. Brazil is located in a tropical region with high light rates and adequate average temperatures for the growth of microalgae. The wide availability of bodies of water and land will allow the country to produce renewable energy from microalgae.
Diferenciais de utiliza??o do cuidado de saúde no sistema suplementar brasileiro
Andrade, Monica Viegas;Maia, Ana Carolina;
Estudos Econ?micos (S?o Paulo) , 2009, DOI: 10.1590/S0101-41612009000100001
Abstract: this paper investigates the existence of differentials of healthcare utilization between private and non private insured individuals using a counter-factual analysis. we estimate healthcare utilization for 1998 and 2003. two variables of healthcare utilization have been selected: medical visits and the number of inpatient days. the main findings suggest a positive differential of utilization for private insured individuals. the magnitude of these differentials varies across types of medical care. considering medical visits we found that each individual in the private sector uses 25% more services than if they only have access to healthcare services through public sector and for inpatient days this percentage is lower, around 10%.we use three different procedures to deal with the endogeneity of private insurance decision. our findings are very robust and in accordance with international empirical evidence.
A rela??o entre estrutura ocupacional e acesso a plano de saúde no Brasil: uma análise para 1998 e 2003
Machado, Ana Flavia;Andrade, M?nica Viegas;Maia, Ana Carolina;
Cadernos de Saúde Pública , 2012, DOI: 10.1590/S0102-311X2012000400015
Abstract: this paper aims to describe health insurance coverage among different types of workers in brazil. health insurance coverage and labor market insertion are used to define homogeneous groups of workers. the grade of membership method is used to build a typology of workers. the database was the brazilian national household survey (pnad) for 1998 and 2003, including a health survey. five worker profiles were defined. the key variables were: health insurance coverage, schooling, and work status. the main findings show a positive association between health insurance coverage, income from work, and trade union membership.
Primary Separation of Antioxidants (Unsaponifiables) the Wet Biomass Microalgae Chlamydomonas sp. and Production of the Biodiesel  [PDF]
Gisel Chenard Díaz, Yordanka Reyes Cruz, Mariana Monteiro Fortes, Carolina Vieira Viegas, René González Carliz, Nelson C. Furtado, Donato A. Gomes Aranda
Natural Science (NS) , 2014, DOI: 10.4236/ns.2014.615108
Abstract: This work studies the saponification which directs the wet biomass of algae Chlamydomonas sp. like a previous stage to production of biodiesel. This stage allows the obtainment of fatty acids to produce biodiesel, instead of the gross lipid fraction. In addition of the fatty acids, utilizing the same process one can also obtain the fraction unsaponifiable, these are soluble in apolar solvents and contain mainly carotenoids that can take action as antioxidants and photoprotectors, as they reduce the oxidation of unsaturated fatty acids. The saponification direct and extraction of fatty acids from biomass is faster and reduces the time and cost of operation. The separation of unsaponifiable matter from the biomass humid of microalgae Chlamydomonas sp., was held according to the method AOCS (Ca 6a-40), using extraction Liquid-liquid with hexane as solvent. Subsequently, phase hydroalcoholic or from soap, containing fatty acids, was acidified by addition of H2SO4 and the fatty acids were recovered by the addition of hexane. After acidulation of the soap, necessary for obtaining of the fatty acids was performed the stage of esterification for obtaining of biodiesel. The operating conditions were: molar ratio fatty acid:methanol (1:10), as catalyst 8% H2SO4 calculated in relation to the mass of fatty acid, 200 and reaction time of 90 minutes. The content of methyl esters was 96.8% determined by gas chromatography according to standard EN14103. The quality of biodiesel produced from wet biomass of Chlamydomonas sp. is according to the specification established by standard EN 14214 and RANP No. 14. For the identification of the composition the unsaponifiable fraction was used the method of High Performance Liquid Chromatography (HPLC). The composition of the material unsaponifiable found was of: Carotenoids total (0.76%); Lutein (0.45%); Zeaxanthin (0.07%); α-carotene (0.05%); β-carotene (0.11%); 13 cisβ-carotene (0.05%) and 9-cisβ-carotene (0.03%).
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%.
El dilema ético de la fluoración del agua potable
Mendoza V,Carolina;
Revista médica de Chile , 2007, DOI: 10.4067/S0034-98872007001100018
Abstract: dental caries remains a worldwide public health problem because of its magnitude and impact on affected people's quality of life. among preventive strategies, water fluoridation is one of the most important, but its value still remains uncertain after more than a half of century of its use. the aim of this study is to analyse some of the ethical arguments for and against water fluoridation and to determine if empirical data allow to decide if there are correct policies from a bioethical perspective. autonomy, compulsory medication (mass medication), precautionary principle, justice in health care and ethics of protection are discussed. it is concluded that fluoridation is beneficial and that there is no ethical reason to oppose it, based on a specific kind of ethics developed to analyse and clarify complex public health's issues
El dilema ético de la fluoración del agua potable The ethical dilemma of water fluoridation
Carolina Mendoza V
Revista médica de Chile , 2007,
Abstract: Dental caries remains a worldwide public health problem because of its magnitude and impact on affected people's quality of life. Among preventive strategies, water fluoridation is one of the most important, but its value still remains uncertain after more than a half of Century of its use. The aim of this study is to analyse some of the ethical arguments for and against water fluoridation and to determine if empirical data allow to decide if there are correct policies from a bioethical perspective. Autonomy, compulsory medication (mass medication), precautionary principle, justice in health care and ethics of protection are discussed. It is concluded that fluoridation is beneficial and that there is no ethical reason to oppose it, based on a specific kind of ethics developed to analyse and clarify complex public health's issues
In vitro effect of 470 nm LED (Light Emitting Diode) in keloid fibroblasts
Bonatti, Silvilena;Hochman, Bernardo;Tucci-Viegas, Vanina Monique;Furtado, Fabianne;Pinfildi, Carlos Eduardo;Pedro, Ana Carolina;Ferreira, Lydia Masako;
Acta Cirurgica Brasileira , 2011, DOI: 10.1590/S0102-86502011000100006
Abstract: purpose: to quantify keloid fibroblasts after irradiation with 470nm blue led, in vitro. methods: fibroblasts from keloid and adjacent skin have been obtained from 6 patients. cells have been cultivated and maintained in dmem culture medium. in petri dishes, they were irradiated with energy doses of 6j, 12j and 18j. after 24 h, counting was done by the average of the triplicates for each sample. results: there were no significant differences in the number of irradiated keloid fibroblasts at the studied doses (p=0.261). in adjacent skin fibroblasts, differences were observed (p=0.025) concerning the doses of 18 j and 6 j (p=0.03). conclusions: there was a reduction in the number of adjacent skin fibroblasts irradiated with 470nm blue led at the energy dose of 18 j compared to the ones irradiated at the energy dose of 6 j. there were no changes in keloid fibroblasts counting at any of the doses applied, 24 h after irradiation.
Custo-benefício do servi?o de telecardiologia no Estado de Minas Gerais: projeto Minas Telecardio
Andrade, M?nica Viegas;Maia, Ana Carolina;Cardoso, Clareci Silva;Alkmim, Maria Beatriz;Ribeiro, Ant?nio Luiz Pinho;
Arquivos Brasileiros de Cardiologia , 2011, DOI: 10.1590/S0066-782X2011005000080
Abstract: background: telecardiology is a tool that can aid in cardiovascular care, mainly in towns located in remote areas. however, economic assessments on this subject are scarce and have yielded controversial results. objective: to evaluate the cost-benefit of implementing a telecardiology service in remote, small towns in the state of minas gerais, brazil. methods: the study used the database from the minas telecardio (mtc) project, developed from june 2006 to november 2008, in 82 towns in the countryside of the state. each municipality received a microcomputer with a digital electrocardiograph, with the possibility of transmitting ecg tracings and communicating with the on-duty cardiologist at the university hospital. the cost-benefit analysis was carried out by comparing the cost of performing an ecg in the project versus the cost of performing it by patient referral to another city. results: the average cost of an ecg in the mtc project was r$ 28.92, decomposed into r$ 8.08 for the cost of implementation and r$ 20.84 for maintenance. the cost simulation of the ecg with referral ranged from r$ 30.91 to r$ 54.58, with the cost-benefit ratio being always favorable to the mtc program, regardless of the type of calculation used for referral distance. the simulations considered the financial sponsor's and society's points-of-view. the sensitivity analysis with variation of calibration parameters confirmed these results. conclusion: the implementation of a telecardiology system as support to primary care in small brazilian towns is feasible and economically beneficial, and can be used as a regular program within the brazilian public health system.
Incorpora??o de ?mega-3 no tecido muscular da tilápia do Nilo alimentada com dietas contendo silagem de cabe?a de camar?o
Costa, Carolina Nunes;Silva, Jaff Ribeiro da;Melo, Fulvio Viegas Teixeira de;Hisano, Hamilton;Druzian, Janice Izabel;Portz, Leandro;
Ciência Rural , 2012, DOI: 10.1590/S0103-84782011005000151
Abstract: the aim of the present study was to assess the effect of diets supplemented with shrimp-head silage on the incorporation of n-3 in the nile tilapia fillets. epa (eicosapentaenoic), dha (docosahexanoic) and total lipids were determined by chromatography in feeds and the muscles of tilapia specimens were submitted to diets supplemented with a varying degree of silage (0, 4, 8, 12, 16%). the total lipid content ranged from 6.70 to 10.30% in the diets and from 0.79 to 1.37% in the tilapia fillets. in diet with high concentration of silage, it was observed an increase in the level of omega-3 (r=0.92). there was an incorporation of 0.59% (1.34mg 100g-1) and 9.5% (40.50mg 100g-1) of epa and dha, respectively, when the addition of silage to the diet was 16%. the results implication states that the inclusion of 16% of the shrimp head silage in the diet for tilapias increases the levels of incorporation of epa and dha in the filet.
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