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Search Results: 1 - 10 of 981 matches for " Isabela Rosier Olimpio;Bertolami "
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Lipid peroxidation and nitric oxide inactivation in postmenopausal women
Pereira Isabela Rosier Olimpio,Bertolami Marcelo Chiara,Faludi André Arpad,Campos Maria Fernanda
Arquivos Brasileiros de Cardiologia , 2003,
Abstract:
Lipid peroxidation and nitric oxide inactivation in postmenopausal women
Pereira, Isabela Rosier Olimpio;Bertolami, Marcelo Chiara;Faludi, André Arpad;Campos, Maria Fernanda;Ferderbar, Simone;Lima, Emersom Silva;Aldrighi, José Mendes;Abdalla, Dulcineia Saes Parra;
Arquivos Brasileiros de Cardiologia , 2003, DOI: 10.1590/S0066-782X2003000400005
Abstract: objective: to assess the effect of endogenous estrogens on the bioavailability of nitric oxide (·no) and in the formation of lipid peroxidation products in pre- and postmenopausal women. methods: nox and s-nitrosothiols were determined by gaseous phase chemiluminescence, nitrotyrosine was determined by elisa, cox (cholesterol oxides) by gas chromatography, and cholesteryl linoleate hydroperoxides (ce18:2-ooh), trilinolein (tg18:2-ooh), and phospholipids (pc-ooh) by hplc in samples of plasma. results: the concentrations of nox, nitrotyrosine, cox, ce18:2-ooh, and pc-ooh were higher in the postmenopausal period (33.8±22.3 mm; 230±130 nm; 55±19 ng/ml; 17±8.7 nm; 2775±460 nm, respectively) as compared with those in the premenopausal period (21.1±7.3 mm; 114±41 nm; 31±13 ng/ml; 6±1.4 nm; 1635±373 nm). in contrast, the concentration of s-nitrosothiols was lower in the postmenopausal period (91±55 nm) as compared with that in the premenopausal p in the premenopausal period (237±197 nm). conclusion: in the postmenopausal period, an increase in nitrotyrosine and a reduction of s-nitrosothiol formation, as well as an increase of cox, ce18:2-ooh and pc-ooh formation occurs. therefore, ?no inactivation and the increase in lipid peroxidation may contribute to endothelial dysfunction and to the greater risk for atherosclerosis in postmenopausal women.
Avalia??o das concentra??es plasmática e urinária de isoflavonas purificadas de soja
Pereira, Isabela Rosier Olimpio;Damasceno, Nágila Raquel Teixeira;Pereira, Edimar Cristiano;Tavares, Leoberto Costa;Abdalla, Dulcineia Saes Parra;
Revista Brasileira de Ciências Farmacêuticas , 2002, DOI: 10.1590/S1516-93322002000300005
Abstract: soy isoflavones show antioxidant and estrogenic effects and have been related to decreased risk of cancer and cardiovascular diseases. the goal of the present study was to standardize the extraction of isoflavones from soy molasses and to evaluate the plasmatic and urinary concentrations of isoflavones in rabbits after consumption of extracted isoflavones. isoflavones were extracted with 90% ethanol and purified with a c18 column. the extraction yield was 81%. the purified isoflavone extract was added to the chow (5 mg isoflavone/ kg body weight/ day) used for feeding rabbits during 6 months. the concentration of isoflavones (genistein and daidzein) in the extracts, chow, blood plasma and urine was determined by high performance liquid chromotagraphy. the mean concentration of isoflavones in blood plasma was 4 mm and the urinary excretion was 22 μmol/24 h. the extraction of isoflavones from soy molasses resulted in a suitable preparation for experimental studies.
Introduction
Laurence Rosier
Argumentation et Analyse du Discours , 2012,
Abstract: Au vu de leur importance dans la dynamique sociale des échanges, on ne peut que se réjouir du nombre et de la qualité des travaux consacrés, depuis une vingtaine d’années, à l’insulte/injure et plus largement à la violence verbale , une catégorie qui peut appara tre fourre tout pour certains (Largèche 2011), mais facilement identifiable du point de vue pragmatique et lexical aux yeux de l’institution, et de nature à être contr lée pénalement (Moise & Auger 2003, 2004 notamment). En tém...
Postures de l’érudit-puriste et sociotypifications imaginaires
Laurence Rosier
COnTEXTES : Revue de Sociologie de la Littérature , 2011, DOI: 10.4000/contextes.4724
Abstract: IntroductionAfin de poursuivre notre travail en cours sur les représentations socio-langagières spontanées des locuteurs, leur validité scientifique et leur portée heuristique, nous partirons de quelques définitions en usage d’expressions telles que posture d’érudit et posture de puriste , utilisées dans des productions spontanées d’internautes. Pourquoi ce point de départ ?Nous pensons (et ces positions sont notamment illustrées dans notre ouvrage sur la langue fran aise de 2008 et da...
Chaotic dynamical systems associated with tilings of $\R^N$
Lionel Rosier
Mathematics , 2010,
Abstract: In this chapter, we consider a class of discrete dynamical systems defined on the homogeneous space associated with a regular tiling of $\R^N$, whose most familiar example is provided by the $N-$dimensional torus $\T ^N$. It is proved that any dynamical system in this class is chaotic in the sense of Devaney, and that it admits at least one positive Lyapunov exponent. Next, a chaos-synchronization mechanism is introduced and used for masking information in a communication setup.
The cosmological constant problem: a user's guide
Orfeu Bertolami
Physics , 2009, DOI: 10.1142/S0218271809015862
Abstract: We discuss the validity of general relativity at low-energy and relate the threshold below which the theory breaks down with the observed value of the cosmological constant. This suggests the existence of a mass scale of ${\cal O}(10^{-3}) eV$ and a putative violation of the equivalence principle at about $10^{-14}$ level.
Gamma-ray bursts, axion emission and string theory dilaton
O. Bertolami
Physics , 1999, DOI: 10.1016/S0927-6505(99)00005-5
Abstract: The emission of axions from supernovae is an interesting possibility to account for the Gamma-Ray Bursts provided their energy can be effectively converted into electromagnetic energy elsewhere. The connection between supernova and gamma-ray bursts has been recently confirmed by the observed correlation between the burst of April 25, 1998 and the supernova SN1998bw. We argue that the axion convertion into photons can be more efficient if one considers the coupling between an intermediate scale axion and the string theory dilaton along with the inclusion of string loops. We also discuss the way dilaton dynamics may allow for a more effective energy exchange with electromagnetic radiation in the expansion process of fireballs.
A Curvature Principle for the interaction between universes
Orfeu Bertolami
Physics , 2007, DOI: 10.1007/s10714-008-0608-6
Abstract: We propose a Curvature Principle to describe the dynamics of interacting universes in a multi-universe scenario and show, in the context of a simplified model, how interaction drives the cosmological constant of one of the universes toward a vanishingly small value. We also conjecture on how the proposed Curvature Principle suggests a solution for the entropy paradox of a universe where the cosmological constant vanishes.
The Spirit of Unification: The Wei of Physics
Orfeu Bertolami
Physics , 2010,
Abstract: We review, in a historical perspective, developments in physics which led to the emergence of unifying ideas and theories. Some attention is paid to the theoretical programme that started in the second decade of the XXth century and whose objective was to reach a unified description of gravity and electromagnetism. These attempts can be regarded as conceptually akin to the contemporary "theories of everything" which aim to unify all interactions of Nature.
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