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Search Results: 1 - 10 of 224601 matches for " R.;Fraga "
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Manual of Nutritional Therapeutics
Adriana R. Fraga
Medicina (Buenos Aires) , 2008,
Abstract:
Chemical and aroma determination of the pulp and seeds of murici (Byrsonima crassifolia L.)
Rezende, Claudia M.;Fraga, Sandra R. G.;
Journal of the Brazilian Chemical Society , 2003, DOI: 10.1590/S0103-50532003000300014
Abstract: murici (byrsonima crassifolia l., malpighiaceae), a small, tropical fruit, very popular in brazil, has a strong fruity, rancid cheese aroma. high resolution gas chromatography-olfactometry-mass spectrometry and aroma extract dilution analysis identified the most potent substances in its aroma as ethyl butanoate (fruity, sweet), ethyl hexanoate (fruity), 1-octen-3-ol (mushroom like), butyric acid (rancid, cheese), hexanoic acid (pungent, cheese) and phenylethyl alcohol (floral). its pulp is mainly composed of ethyl, methyl and phenylethyl esters and by carboxylic acids, terpenoids, d-lactones and some sulfur compounds. seed analysis also showed a buttery and oily cheese aroma and gc-ms revealed linoleic, oleic, stearic and palmitic acids as foremost components, while the aroma was associated to the butyric and hexanoic acids present in minor amounts.
Chemical and aroma determination of the pulp and seeds of murici (Byrsonima crassifolia L.)
Rezende Claudia M.,Fraga Sandra R. G.
Journal of the Brazilian Chemical Society , 2003,
Abstract: Murici (Byrsonima crassifolia L., Malpighiaceae), a small, tropical fruit, very popular in Brazil, has a strong fruity, rancid cheese aroma. High resolution gas chromatography-olfactometry-mass spectrometry and aroma extract dilution analysis identified the most potent substances in its aroma as ethyl butanoate (fruity, sweet), ethyl hexanoate (fruity), 1-octen-3-ol (mushroom like), butyric acid (rancid, cheese), hexanoic acid (pungent, cheese) and phenylethyl alcohol (floral). Its pulp is mainly composed of ethyl, methyl and phenylethyl esters and by carboxylic acids, terpenoids, delta-lactones and some sulfur compounds. Seed analysis also showed a buttery and oily cheese aroma and GC-MS revealed linoleic, oleic, stearic and palmitic acids as foremost components, while the aroma was associated to the butyric and hexanoic acids present in minor amounts.
Cellular viability and nitric oxide (NO) production by J774 macrophages in the presence of orthodontic archwires  [PDF]
Carlos E. P. Toledo, Maria A. Souza, Marcelo R. Fraga, Luiz C. Ribeiro, Ana P. Ferreira, Robert W. F. Vitral
Journal of Biomedical Science and Engineering (JBiSE) , 2012, DOI: 10.4236/jbise.2012.55032
Abstract: To assess, in vitro, the cellular viability in a murine macrophage cell line J774 with 9 different orthodontic wires and to evaluate the effects of its NO production. To assess cellular viability by MTT: 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl tetrazolium bromide assay in the cell line J774 with 9 different orthodontic wires and quantify NO production by these macrophages. Cell cultures were evaluated at 24, 48 and 72 hours. There was no significant difference of the means of cellular viability between the control and the group of wires in the respective time intervals. In the comparison with the control group, there was significant difference in the NO production in groups 1, 6, and 9 at 24 hours interval. Group 8 showed significant difference in relation to the control group at final time interval. Cellular viability in all groups was higher at the final time interval than at the initial time interval. This increase was significant in the control group. In the material groups, the final mean of cellular viability at 72 hours showed no significant difference when compared with the control group. NO production in all groups was higher at the final time interval than at the initial time interval. This increase was significant in the control group. In the material groups, the final mean of NO production at 72 hours was only significant in group 8 (betatitanium) when compared with the control group.
Digital, Special, Regular and Long Distance Learning: Under a Phenomenological First Glance  [PDF]
Valderez F. Fraga
Open Journal of Social Sciences (JSS) , 2015, DOI: 10.4236/jss.2015.32004
Abstract:

This study presents and discusses trough a phenomenologic qualitative method summed up with an empirical insertion in the challenges of an education project on digital education for special, regular students and also a glace to long distance learning and teaching, in an Experimental School in Brazil. The discussions show the complexity but also the possibility of educational advances, to envision the advantages of the respect for students’ differences, in parallel to educators support and the significance of the aggregation of traditional methods and modern technologies in learning situations for all possible advantages from emotional to multiple intelligences for better living conditions.

Spontaneous acute hemorrhage within a subependymoma of the lateral ventricle: successful emergent surgical removal through a frontal transcortical approach Subependimoma de ventrículo lateral con hemorragia intratumoral aguda espontánea: resección quirúrgica urgente mediante un abordaje frontal transcortical
R. Carrasco,J.M. Pascual,M. Navas,J. Fraga
Neurocirugía , 2010,
Abstract: Introduction. Subependymomas are benign neoplasms intimately related to the ventricular system which only exceptionally associate hemorrhagic events. We present neuroradiological and pathological evidences of intratumoral hemorrhage within a single case of subependymoma operated on at our institution. Additionally we analyze retrospectively the well-defined reports of similar cases published in the scientific literature. Case report. A 71-year-old man on anticoagulant therapy presented with abrupt and progressive deterioration of his level of consciousness. Emergent computed tomography and magnetic resonance imaging evidenced signs of acute bleeding within a mass located at the frontal horn of the left lateral ventricle, producing obstructive biventricular hydrocephalus. The lesion was immediately and completely removed through a left frontal transcortical approach. Pathological diagnosis was consistent with subependymoma displaying areas of microhemorrhage. After surgery the patient developed global anterograde and retrograde amnesia. Conclusions. A spontaneous hemorrhagic event within an asymptomatic lateral ventricle subependymoma can result in a surgical emergence as a consequence of sudden obstruction of cerebrospinal fluid pathways. Prompt and radical surgical removal of the mass, which allows a rapid resolution of hydrocephalus and prevents the risk of rebleeding, may constitute the safest management strategy. Introducción. Los subependimomas son neoplasias benignas que se desarrollan en estrecha relación con el sistema ventricular y que excepcionalmente asocian fenómenos hemorrágicos. Describimos el caso de un subependimoma localizado en el ventrículo lateral que presentó una hemorragia intratumoral aguda de forma espontánea, como se evidenció en los estudios neurorradiológicos y patológicos realizados, incluyendo un análisis exhaustivo de los casos similares descritos en la literatura científica. Caso clínico. Se trata de un varón de 71 a os que recibía tratamiento anticoagulante, y que presentó un cuadro brusco y progresivo de disminución del nivel de conciencia. Los estudios de neuroimagen evidenciaron la presencia de una masa localizada en el ventrículo lateral izquierdo, con signos de hemorragia reciente en su seno, que producía hidrocefalia biventricular aguda. La lesión fue resecada en su totalidad de forma urgente mediante un abordaje frontal transcortical. El estudio patológico de la lesión demostró que se trataba de un subependimoma con focos hemorrágicos. En el periodo postoperatorio, el paciente presentó un déficit de memoria global,
Self-gravitating system of semidegenerate fermions as central objects and dark matter halos in galaxies
Bernardo M. O. Fraga,Carlos R. Arguelles,Remo Ruffini
Physics , 2014, DOI: 10.1142/S2010194513011616
Abstract: We propose a unified model for dark matter haloes and central galactic objects as a self-gravitating system of semidegenerated fermions in thermal equilibrium. We consider spherical symmetry and then we solve the equations of gravitational equilibrium using the Fermi integrals in a dimensionless manner, obtaining the density profile and velocity curve. We also obtain scaling laws for the observables of the system and show that, for a wide range of our parameters, our model is consistent with the so called universality of the surface density of dark matter.
Critical configurations for a system of semidegenerate fermions
Carlos R. Argüelles,Remo Ruffini,Bernardo M. O. Fraga
Physics , 2014, DOI: 10.3938/jkps.65.809
Abstract: We study an isothermal system of semi-degenerate self-gravitating fermions in general relativity. Such systems present mass density solutions with a central degenerate core, a plateau and a tail which follows a power law behaviour $r^{-2}$. The different solutions are governed by the free parameters of the model: the degeneracy and temperature parameters at the center, and the particle mass $m$. We then analyze in detail the free parameter space for a fixed $m$ in the keV regime, by studying the one-parameter sequences of equilibrium configurations up to the critical point, which is represented by the maximum in a central density ($\rho_0$) Vs. core mass ($M_c$) diagram. We show that for fully degenerate cores, the known expression for the critical core mass $M_c^{cr}\propto m_{pl}^3/m^2$ is obtained, while instead for low degenerate cores, the critical core mass increases showing the temperature effects in a non linear way. The main result of this work is that when applying this theory to model the distribution of dark matter in galaxies from the very center up to the outer halos, we do not find any critical core-halo configuration of self-gravitating fermions, which be able to explain the super massive dark object in their centers together with an outer halo simultaneously.
On the distribution of dark matter in galaxies: quantum treatments
Carlos R. Argüelles,Remo Ruffini,Ivan Siutsou,Bernardo Fraga
Physics , 2014, DOI: 10.3938/jkps.65.801
Abstract: The problem of modeling the distribution of dark matter in galaxies in terms of equilibrium configurations of collisionless self-gravitating quantum particles is considered. We first summarize the pioneering model of a Newtonian self-gravitating Fermi gas in thermodynamic equilibrium developed by Ruffini and Stella (1983), which is shown to be the generalization of the King model for fermions. We further review the extension of the former model developed by Gao, Merafina and Ruffini (1990), done for any degree of fermion degeneracy at the center ($\theta_0$), within general relativity. Finally, we present here for the first time the solutions of the density profiles and rotation curves corresponding to the Gao et. al. model, which have a definite mass $M_h$ and circular velocity $v_h$, at the halo radius $r_h$ of the configurations, typical of spiral galaxies. This treatment allow us to determine a novel core-halo morphology for the dark matter profiles, as well as a novel particle mass bound associated with them.
Cibercenários: Hekuras, Karuanas & Kurupiras
Tania Fraga
Galáxia , 2008,
Abstract: O projeto apresenta a possibilidade de miscigena o do campo biológico com instrumentos tecnológicos computacionais em jornadas que utilizam a computa o gráfica tridimensional interativa como cibercenários e que possibilitam a participa o ativa dos intérpretes que com elas interagem. O intérprete provoca mudan as, em tempo real, nos nichos virtuais que comp em os cibermundos, pela manipula o de um mouse sem fio. As jornadas resultantes integram suas a es com aquelas processadas em tempo real no computador. As imagens computacionais processadas s o projetadas em telas sobre o palco e sobre esses intérpretes. Palavras-chave intera o, arte computacional interativa, realidade virtual, arte contemporanea Abstract The project presents the possibility of amalgamating the biological field with computational, technological instruments by means of journeys using graphic, interactive, three-dimensional computation, which takes the form of cyber-scenarios, which allows the active participation of the performers in them. Each performer, manipulating a wireless mouse, interacts in real time with virtual niches that compose cyberworlds. The journeys integrate the actions carried out by the performers with those processed in real time on the computer. The final computer images are projected onto screens both on the stage and on the performers. Key words interaction, interactive computer art, virtual reality, contemporary art
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