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Search Results: 1 - 10 of 345449 matches for " Thiago S. Gon?alves "
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Lyman Break Analogs: Constraints on the Formation of Extreme Starbursts at Low and High Redshift
Thiago S. Gonalves,Roderik Overzier,Antara Basu-Zych,D. Christopher Martin
Physics , 2011, DOI: 10.1017/S1743921311022654
Abstract: Lyman Break Analogs (LBAs), characterized by high far-UV luminosities and surface brightnesses as detected by GALEX, are intensely star-forming galaxies in the low-redshift universe ($z\sim 0.2$), with star formation rates reaching up to 50 times that of the Milky Way. These objects present metallicities, morphologies and other physical properties similar to higher redshift Lyman Break Galaxies (LBGs), motivating the detailed study of LBAs as local laboratories of this high-redshift galaxy population. We present results from our recent integral-field spectroscopy survey of LBAs with Keck/OSIRIS, which shows that these galaxies have the same nebular gas kinematic properties as high-redshift LBGs. We argue that such kinematic studies alone are not an appropriate diagnostic to rule out merger events as the trigger for the observed starburst. Comparison between the kinematic analysis and morphological indices from HST imaging illustrates the difficulties of properly identifying (minor or major) merger events, with no clear correlation between the results using either of the two methods. Artificial redshifting of our data indicates that this problem becomes even worse at high redshift due to surface brightness dimming and resolution loss. Whether mergers could generate the observed kinematic properties is strongly dependent on gas fractions in these galaxies. We present preliminary results of a CARMA survey for LBAs and discuss the implications of the inferred molecular gas masses for formation models.
Quenching star formation at intermediate redshifts: downsizing of the mass flux density in the green valley
Thiago S. Gonalves,D. Christopher Martin,Karín Menéndez-Delmestre,Ted Wyder,Anton Koekemoer
Physics , 2012, DOI: 10.1088/0004-637X/759/1/67
Abstract: The bimodality in galaxy properties has been observed at low and high redshift, with a clear distinction between star-forming galaxies in the blue cloud and passively evolving objects in the red sequence; the absence of galaxies with intermediate properties indicates that the quenching of star formation and subsequent transition between populations must happen rapidly. In this paper, we present a study of over 100 transiting galaxies in the so-called "green valley" at intermediate redshifts (z ~ 0.8). By using very deep spectroscopy with the DEIMOS instrument at the Keck telescope we are able to infer the star formation histories of these objects and measure the stellar mass flux density transiting from the blue cloud to the red sequence when the universe was half its current age. Our results indicate that the process happened more rapidly and for more massive galaxies in the past, suggesting a top-down scenario in which the massive end of the red sequence is forming first. This represent another aspect of downsizing, with the mass flux density moving towards smaller galaxies in recent times.
Controle alternativo da podrid?o peduncular em manga
Lins, Severina Rodrigues de Oliveira;Oliveira, S?nia Maria Alves de;Alexandre, Elizabeth Rodrigues;Santos, Alice Maria Gonalves;Oliveira, Thiago Alves Santos de;
Summa Phytopathologica , 2011, DOI: 10.1590/S0100-54052011000300007
Abstract: the aim of this study was to evaluate the effect of alternative products in mango sleeves inoculated challenged with lasiodiplodia theobromae and its influence on the mycelial growth of the pathogen in vitro. mangoes were treated with: potassium phosphate (50, 100 and 150), hidroxidobenzóico acid (5, 10 and 15), calcium chloride (0.13, 0.26 and 0.39) (in mmol), ultraviolet light ( 10, 20 and 30 min.), extracts of garlic, melons of the caetano, bark of mango (25, 50 and 75%) and water (control). the design was a split plot. 106 con./ml was inoculated immediately after each treatment (t1), twelve hours after (t2) and twenty-four hours after (t3). in t1, the best treatments were po (50 mmol) and cc (0.13 mmol). t2 in there were cc (0.13 mmol), ah (5 mmol), ea (25%) and fp (100 mmol). in t3 there was no difference between treatments. in vitro treatments were mixed into the culture medium. after solidification it was placed in the center of each plate, structures of the phythopathogen. the model was in dic with 6 replications. after 48 hours it was measured the diameter of the colony. the best treatments were fp (100 and 150 mmol), ecm (50 and 75%) and ea (50%).
Adult Reye-like syndrome associated with serologic evidence of acute parvovirus B19 infection
Costa, Paulo Sérgio Gonalves da;Ribeiro, Geyza Machado;Vale, Thiago Cardoso;Casali, Thaís Gomes;Leite, Flávio José Barbosa;
Brazilian Journal of Infectious Diseases , 2011, DOI: 10.1590/S1413-86702011000500012
Abstract: reye's syndrome is an infrequently diagnosed medical condition affecting mainly children. the etiology, epidemiology and natural history of reye's syndrome have been cloudily written in footnotes of medical books and exotic papers since the initial description in early 1950s. we report here a case of adult reye's syndrome associated with serologic evidence of parvovirus b19 infection.
Determination of cetirizine in tablets and compounded capsules: comparative study between CE and HPLC
Bajerski, Lisiane;Sangoi, Maximiliano da Silva;Barth, Thiago;Diefenbach, Isabel Fra??o;Dalmora, Sérgio Luís;Cardoso, Simone Gonalves;
Química Nova , 2010, DOI: 10.1590/S0100-40422010000100021
Abstract: a capillary electrophoresis (ce) method was developed and validated for determination of cetirizine dihydrochloride in tablets and compounded capsules. the electrophoretic separation was performed in an uncoated fused-silica capillary (40 cm x 50 μm i.d.) using 20 mmol l-1 sodium tetraborate buffer (ph 9.3) as background electrolyte, a hydrodinamic sample injection at 50 mbar for 5 s, 20 kv applied voltage at 25 °c, and detection at 232 nm. the proposed method was compared with the high performance liquid chromatographic (hplc) method previously validated for this drug, and statistical analysis showed no significant difference between the techniques.
Geothermal Dynamics in Vochysia Divergens Forest in a Brazilian Wetland
Jonathan Willian Zangeski Novais, Thiago Rangel Rodrigues, Leone Francisco Amorim Curado, Allan Gon alves Oliveira, Sérgio Roberto de Paulo, José de Souza Nogueira and Renan Gon alves de Oliveira
Air, Soil and Water Research , 2012, DOI: 10.4137/ASWR.S11364
Abstract: Research involving the thermal soil dynamics of wetland areas has not yet been explored in a way that promotes a deeper understanding of the dynamics of this region. This makes it necessary for further studies to contribute to the understanding of this biome. In the present work, we studied the thermal dynamics of the soil contrasting seasonal conditions in the Vochysia Divergens Forest. The Fourier equation was used to analyze the influence of the thermal conductivity and thermal gradient on the soil heat flux. We determined how variable water content causes the system to behave differently in the four seasons, observing seasonality in soil when completely dry and when completely flooded.
Clustering and artificial neural networks: classification of variable lengths of Helminth antigens in set of domains
Rodrigues, Thiago de Souza;Pacífico, Lucila Grossi Gonalves;Teixeira, Santuza Maria Ribeiro;Oliveira, Sérgio Costa;Braga, Ant?nio de Pádua;
Genetics and Molecular Biology , 2004, DOI: 10.1590/S1415-47572004000400032
Abstract: a new scheme for representing proteins of different lengths in number of amino acids that can be presented to a fixed number of inputs artificial neural networks (anns) speel-out classification is described. k-means's clustering of the new vectors with subsequent classification was then possible with the dimension reduction technique principal component analysis applied previously. the new representation scheme was applied to a set of 112 antigens sequences from several parasitic helminths, selected in the national center for biotechnology information and classified into fourth different groups. this bioinformatic tool permitted the establishment of a good correlation with domains that are already well characterized, regardless of the differences between the sequences that were confirmed by the pfam database. additionally, sequences were grouped according to their similarity, confirmed by hierarchical clustering using clustalw.
Unitary input DEA model to identify beef cattle production systems typologies
Gomes, Eliane Gonalves;Abreu, Urbano Gomes Pinto de;Mello, Jo?o Carlos Correia Baptista Soares de;Carvalho, Thiago Bernardino de;Zen, Sérgio de;
Pesquisa Operacional , 2012, DOI: 10.1590/S0101-74382012005000015
Abstract: the cow-calf beef production sector in brazil has a wide variety of operating systems. this suggests the identification and the characterization of homogeneous regions of production, with consequent implementation of actions to achieve its sustainability. in this paper we attempted to measure the performance of 21 livestock modal production systems, in their cow-calf phase. we measured the performance of these systems, considering husbandry and production variables. the proposed approach is based on data envelopment analysis (dea). we used unitary input dea model, with apparent input orientation, together with the efficiency measurements generated by the inverted dea frontier. we identified five modal production systems typologies, using the isoefficiency layers approach. the results showed that the knowledge and the processes management are the most important factors for improving the efficiency of beef cattle production systems.
Mapping the Clumpy Structures within Submillimeter Galaxies using Laser-Guide Star Adaptive Optics Spectroscopy
Karín Menéndez-Delmestre,Andrew W. Blain,Mark Swinbank,Ian Smail,Rob J. Ivison,Scott C. Chapman,Thiago S. Gonalves
Physics , 2013, DOI: 10.1088/0004-637X/767/2/151
Abstract: We present the first integral-field spectroscopic observations of high-redshift submillimeter-selected galaxies (SMGs) using Laser Guide Star Adaptive Optics (LGS-AO). We target H-alpha emission of three SMGs at redshifts z~1.4-2.4 with the OH-Suppressing Infrared Imaging Spectrograph (OSIRIS) on Keck. The spatially-resolved spectroscopy of these galaxies reveals unresolved broad H-alpha line regions (FWHM>1000 km/s) likely associated with an AGN and regions of diffuse star formation traced by narrow-line H-alpha emission (FWHM<500 km/s) dominated by multiple Halpha-bright stellar clumps, each contributing 1-30% of the total clump-integrated H-alpha emission. We find that these SMGs host high star-formation rate surface densities, similar to local extreme sources, such as circumnuclear starbursts and luminous infrared galaxies. However, in contrast to these local environments, SMGs appear to be undergoing such intense activity on significantly larger spatial scales as revealed by extended H-alpha emission over 4-16 kpc. H-alpha kinematics show no evidence of ordered global motion as would be found in a disk, but rather large velocity offsets (~few x 100 km/s) between the distinct stellar clumps. Together with the asymmetric distribution of the stellar clumps around the AGN in these objects, it is unlikely that we are unveiling a clumpy disk structure as has been suggested in other high-redshift populations of star-forming galaxies. The SMG clumps in this sample may correspond to remnants of originally independent gas-rich systems that are in the process of merging, hence triggering the ultraluminous SMG phase.
Doen?as do cérebro em Campina Grande, Paraíba: incidência
Coêlho, Thiago D. Gonalves;
Arquivos de Neuro-Psiquiatria , 1994, DOI: 10.1590/S0004-282X1994000100008
Abstract: in this study it is shown the incidence of brain diseases in campina grande pb, brazil taking account hospitalizations under prospective payments. neurologic affections were classified according to icd-9. it is demonstrated that 3.09% of hospitalizations are due to brain diseases, mainly cerebrovascular disorders. it is evident that campina grande is included in brazil's north-east average of brain diseases representation, and this result contrasts with nation-wide results because of regional differences. mental disturbances were not included in this study because of the difficulty in obtaining data; they were classified in the other diseases group.
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