oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 36 )

2018 ( 46 )

2017 ( 36 )

2016 ( 35 )

Custom range...

Search Results: 1 - 10 of 8569 matches for " Gabriel Ferro "
All listed articles are free for downloading (OA Articles)
Page 1 /8569
Display every page Item
Influence of Dietary Energy Level on Hepatic70-kDa Heat Shock Protein Expression in Broiler Chickens Submitted to Acute Heat Stress
Gabriel JE,Ferro MIT,Ferro JA,Silva MM
Revista Brasileira de Ciência Avícola , 2000,
Abstract: This experiment was carried out to study the effect of dietary energy on the colonic temperature and hepatic Hsp70 content in broiler chicken at room temperature and after heat stress conditions. Broiler chickens were reared up to 51 days of life, and fed diets containing high (HE -13,186 kJ ME/kg) or low (LE -12,139 kJ ME/kg) energy. At 21 and 51 days of age, the colonic temperature was measured at room temperature and liver samples were obtained for Hsp70 quantification by Western blotting analysis. It was also investigated at these ages the time course response of colonic temperature and hepatic Hsp70 level during heat stress (35o C/5 h). The data showed that at early age, at room temperature, colonic temperature or hepatic Hsp70 levels were not affected by dietary energy, but at 51 days of life low energy fed broilers had lower Hsp70 concentration in the liver. During heat stress, the increase in both colonic temperature and hepatic Hsp70 concentration were significantly less in high energy fed birds. The findings of this study suggest that hepatic Hsp70 synthesis is affected by dietary energy, and that broiler chicken fed high-energy diet can change the thermoresistance during acute heat stress.
Brain and hepatic Hsp70 protein levels in heat-acclimated broiler chickens during heat stress
Guerreiro, EN;Giachetto, PF;Givisiez, PEN;Ferro, JA;Ferro, MIT;Gabriel, JE;Furlan, RL;Macari, M;
Revista Brasileira de Ciência Avícola , 2004, DOI: 10.1590/S1516-635X2004000400002
Abstract: in the present study we have investigated the effects of heat acclimation on brain and hepatic hsp70 protein levels and body temperature of broiler chickens in response to gradual heat stress. two groups of broilers were raised up to 47 days of age under distinct temperature conditions: thermoneutral (tn, according to bird age) or hot environmental (hs, 31-33°c). at 46 days of age, the birds reared at high ambient temperature were transferred to thermoneutrality conditions. after 18 h, these birds and the birds reared at thermoneutral temperature were submitted to gradual heat stress in a climatic chamber so that environment temperature was increased from 28 to 40oc at a rate of 2oc/h. colonic temperature was measured using a thermometer sensor probe at each two hours, and hepatic and brain tissues were collected immediately after slaughter in order to assess hsp70 protein level by western blotting analysis. the colonic temperatures of birds reared at high temperature increased steeply during the first 2 h of heat stress (1.06oc/h) and more slowly thereafter (0.59oc/h). broilers reared at thermoneutral temperature showed a small increase in the first 4 h of heat stress (0.18oc/h) and then colonic temperature increased sharply (0.72oc/h). nevertheless, both groups presented similar final colonic temperature by the end of the stress period. hsp70 levels (ng hsp70 μg total protein-1) did not change in the liver or brain of the birds reared at high temperature. on the other hand, both liver and brain hsp70 levels increased significantly during heat stress in the animals reared at thermoneutrality, with a higher expression of this peptide in brain tissue.
Influência do Nível de Energia da Dieta sobre a Express?o Hepática de Hsp70-kDa em Frangos Submetidos ao Estresse Calórico Agudo
Gabriel, JE;Ferro, MIT;Ferro, JA;Silva, MM;Givisiez, PEN;Macari, M;
Revista Brasileira de Ciência Avícola , 2000, DOI: 10.1590/S1516-635X2000000300008
Abstract: this experiment was carried out to study the effect of dietary energy on the colonic temperature and hepatic hsp70 content in broiler chicken at room temperature and after heat stress conditions. broiler chickens were reared up to 51 days of life, and fed diets containing high (he -13,186 kj me/kg) or low (le -12,139 kj me/kg) energy. at 21 and 51 days of age, the colonic temperature was measured at room temperature and liver samples were obtained for hsp70 quantification by western blotting analysis. it was also investigated at these ages the time course response of colonic temperature and hepatic hsp70 level during heat stress (35o c/5 h). the data showed that at early age, at room temperature, colonic temperature or hepatic hsp70 levels were not affected by dietary energy, but at 51 days of life low energy fed broilers had lower hsp70 concentration in the liver. during heat stress, the increase in both colonic temperature and hepatic hsp70 concentration were significantly less in high energy fed birds. the findings of this study suggest that hepatic hsp70 synthesis is affected by dietary energy, and that broiler chicken fed high-energy diet can change the thermoresistance during acute heat stress.
Vacinas contra varicela e vacina quádrupla viral
Bricks, Lucia Ferro;Sato, Helena Keico;Oselka, Gabriel Wolf;
Jornal de Pediatria , 2006, DOI: 10.1590/S0021-75572006000400012
Abstract: objectives: to present an up-to-date review of studies investigating the efficacy, adverse events and vaccination regimens of the varicella vaccine and the new presentation combined with the vaccine for measles, mumps and rubella. sources of data: bibliographic review of the medline and lilacs databases covering the period 1999 to 2006 summary of the findings: the varicella vaccine protects 70 to 90% of immunized children against any form of varicella zoster infection, but the efficacy against severe forms is higher (95 to 98%). this is a well-tolerated vaccine that causes few reactions. since the vaccine was licensed, there have been three confirmed cases of transmission of the vaccine virus by domestic contacts to previously healthy people, who went on to develop mild disease. despite evidence that the protection offered by this vaccine can wane over a number of years, it is not yet possible to state that a second dose is warranted, bearing in mind exposure to wild virus. after universal vaccination the chances of natural stimulation should drop and it is very probable that booster doses will become necessary. a measles, mumps, rubella, and varicella vaccine has recently been licensed that combines vaccines for measles, mumps, rubella and varicella in a single product with high rates of seroconversion. conclusions: the brazilian society of pediatrics recommends the varicella vaccine for children from 1 year on. we hope that the measles, mumps, rubella, and varicella vaccine will soon be available in brazil, since combined vaccines facilitate wider vaccination coverage.
Hepatic mRNA expression and plasma levels of insulin-like growth factor-I (IGF-I) in broiler chickens selected for different growth rates
Giachetto Poliana Fernanda,Riedel Eduardo Correa,Gabriel Jane Eyre,Ferro Maria Inês Tiraboschi
Genetics and Molecular Biology , 2004,
Abstract: The hepatic expression and plasma concentrations of IGF-I were investigated in three broiler chicken strains selected for different growth rates (HP-Hubbard-Pettersen, a fast growing strain; NN-Naked-neck, a strain with an intermediate growth rate and a heterozygous genotype, and C-Caipira, a slow growing crossbred strain). The chickens were studied at 1, 21 and 42 days of age and had free access to food throughout the study. Hepatic IGF-I mRNA expression was assessed by dot blot analysis using a randomly labeled chicken IGF-I cDNA as the probe and plasma IGF-I concentrations were assayed by radioimmunoassay. The hepatic levels of IGF-I mRNA increased from 1 to 21 days of age in all strains, with NN chickens showing a higher (p < 0.05) IGF-I expression than the other strains. Plasma IGF-I concentrations increased (p < 0.05) with broiler chicken age, but there were no significant differences among the strains. These results indicate that despite differences in the growth rates among the strains, the changes in the expression of IGF-I mRNA in liver and in the plasma levels of IGF-I were independent of broiler chicken strain, but varied with chicken age.
Protection of Investors and Credit Rating Agencies Regulation in Latin America  [PDF]
Márcio Ferro Catapani
Beijing Law Review (BLR) , 2018, DOI: 10.4236/blr.2018.94032
Abstract: The growth and expansion of economies of developing countries rely, in a great extension, on the access to financing sources for entrepreneur activities. Capital markets are one of the most efficient alternatives for local companies to have access to capitals, either local or foreign, and, therefore, for the boosting of the economic progress of such countries. In this sense, a legal framework of capital markets that fulfill the requirements of stability, certainty and security are essential in order to countries to compete for international capitals and investments. Indeed, such requirements are imperative to grow an environment of confidence of investors. Among other important issues in the capital markets regulation scope, there are two that have a vital importance to induce the confidence of investors and, consequently, to attract investment: the legal protection of investors and the regulation of the activities of credit rating agencies. It is vital that the legal system sets a framework for the protection of investors in the capital markets. The need of a stable, clear and secure framework does not imply an excessive intervention of the state in the ability of private economic agents to regulate their own interests. On the contrary, the state shall only provide for the minimum content of the financial services agreement and assure the compliance of the obligations taken under a contract. Furthermore, as the investment decisions made by economic agents rely mostly on the information they have on the financial instruments that are offered in the market, rules determining the full disclosure of information are essential. Concerning credit rating agencies, it is important to understand the role that such entities have undertaken in capital markets. Information about companies and financial instruments is the material economic agents use to make their investment decisions. But the cost to process and analyze the whole bunch of available data is too high for most agents, so they have to rely on the opinion of experts, such as credit rating agencies. In this context, regulation shall assure that the aforementioned agencies act in a fair and transparent way. Rules concerning conflict of interests, publicity of the criteria of rating analysis, and supervision on the activities of agencies are important to the growth of a sound capital market and an investment friendly environment. The article will focus on some of the production-centered jurisdictions—Argentina, Brazil, Chile, Colombia, Mexico, and Venezuela. They were chosen because they are the major
Hepatic mRNA expression and plasma levels of insulin-like growth factor-I (IGF-I) in broiler chickens selected for different growth rates
Giachetto, Poliana Fernanda;Riedel, Eduardo Correa;Gabriel, Jane Eyre;Ferro, Maria Inês Tiraboschi;Di Mauro, S?nia Marli Zingaretti;Macari, Marcos;Ferro, Jesus Aparecido;
Genetics and Molecular Biology , 2004, DOI: 10.1590/S1415-47572004000100007
Abstract: the hepatic expression and plasma concentrations of igf-i were investigated in three broiler chicken strains selected for different growth rates (hp-hubbard-pettersen, a fast growing strain; nn-naked-neck, a strain with an intermediate growth rate and a heterozygous genotype, and c-caipira, a slow growing crossbred strain). the chickens were studied at 1, 21 and 42 days of age and had free access to food throughout the study. hepatic igf-i mrna expression was assessed by dot blot analysis using a randomly labeled chicken igf-i cdna as the probe and plasma igf-i concentrations were assayed by radioimmunoassay. the hepatic levels of igf-i mrna increased from 1 to 21 days of age in all strains, with nn chickens showing a higher (p < 0.05) igf-i expression than the other strains. plasma igf-i concentrations increased (p < 0.05) with broiler chicken age, but there were no significant differences among the strains. these results indicate that despite differences in the growth rates among the strains, the changes in the expression of igf-i mrna in liver and in the plasma levels of igf-i were independent of broiler chicken strain, but varied with chicken age.
Highly Confined Hybrid Spoof Surface Plasmons in Ultra-thin Metal/Dielectric Heterostructures
S. Hossein Mousavi,Alexander B. Khanikaev,Burton Neuner III,Yoav Avitzour,Dmitriy Korobkin,Gabriel Ferro,Gennady Shvets
Physics , 2010, DOI: 10.1103/PhysRevLett.105.176803
Abstract: Highly confined "spoof" surface plasmon-like (SSP) modes are theoretically predicted to exist in a perforated metal film coated with a thin dielectric layer. Strong modes confinement results from the additional waveguiding by the layer. Spectral characteristics, field distribution, and lifetime of these SSPs are tunable by the holes' size and shape. SSPs exist both above and below the light line, offering two classes of applications: "perfect" far-field absorption and to efficient emission into guided modes. It is experimentally shown that these plasmon-like modes can turn thin, weakly-absorbing semiconductor films into perfect absorbers.
Photonic Crystal Cavities in Cubic (3C) Polytype Silicon Carbide Films
Marina Radulaski,Thomas M. Babinec,Sonia Buckley,Armand Rundquist,J Provine,Kassem Alassaad,Gabriel Ferro,Jelena Vu?kovi?
Physics , 2013, DOI: 10.1364/OE.21.032623
Abstract: We present the design, fabrication, and characterization of high quality factor and small mode volume planar photonic crystal cavities from cubic (3C) thin films (thickness ~ 200 nm) of silicon carbide (SiC) grown epitaxially on a silicon substrate. We demonstrate cavity resonances across the telecommunications band, with wavelengths from 1,250 - 1,600 nm. Finally, we discuss possible applications in nonlinear optics, optical interconnects, and quantum information science.
Physicochemical and Electrical Properties of Praseodymium Oxides
Sergio Ferro
International Journal of Electrochemistry , 2011, DOI: 10.4061/2011/561204
Abstract: The industrial research is continuously looking for novelties that could improve the applied processes, increasing the yields, lowering the costs, or improving the performances. In industrial electrochemistry, one more aspect is the stability of electrode materials, which is generally balanced by the catalytic activity: the higher the latter, the lower the former. A compromise has to be found, and an optimization is often the result of new ideas that completely change the way of thinking. Praseodymium-oxide-based cathodes have been proved to be quite interesting devices: the hydrogen evolution reaction is guaranteed by the presence of a noble metal (platinum and/or rhodium), while the stability and poisoning resistance seem to be strongly improved by the presence of lanthanide oxides. 1. Introduction The reduction of costs, in terms of energy consumption and loading of precious metals for catalysts, is the main reason for the continuous research of more performing electrode materials. While the insoluble anodes adopted in the chlor-alkali industry have been investigated for some decades (starting from the pioneering works by Henry Beer in the seventies), the optimization of cathode performances is a recent request, and the research is still ongoing on this subject. At the moment, the membrane technology makes use of low-carbon steel cathodes, but both their relatively low exchange current density (high overpotential, i.e., from 300 to 400?mV) toward the hydrogen evolution reaction (HER) and their susceptibility to corrosion under the increasingly hard operating conditions (request for more concentrated sodium hydroxide solution production) have prompted for new materials. A significant reduction (from 100 to 200?mV) of HER overpotential has been obtained substituting the steel cathodes with nickel-based devices, possibly provided with catalytic coatings. However, the durability of such electrodes is limited, as the coating tends to dissolve, while impurities (mainly iron) are deposited on the electrode surface, reducing the catalytic activity. In the last years, the industrial research has started investigating the behavior of devices provided with coatings in which a noble-metal catalyst is mixed with one or more oxides of lanthanide elements. A mixed platinum-cerium oxide coating has been claimed by Permelec Electrode Ltd. [1]: it is assumed that the cerium component has a crucial role in maintaining the catalytic activity of the noble metal, impeding the electrochemical deposition of iron; at the same time, the cerium oxide shows a good stability in
Page 1 /8569
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.