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1,4- Addition of diazomethane to a heterodiene: a direct preparation of the oxazolic ring Anais da ABC (AABC)
Emery,Flávio da S.; Silva,Raphael S.F.; Moura,Kelly C.G. de; Pinto,Maria C.F.R.; Amorim,Mauro B.; Malta,Valéria R.S.; Santos,Regina H.A.; Honório,Kátia M.; Silva,Albérico B.F. da; Pinto,Antonio V..
The reaction of naphthoquinone-oximes (3) and (4) with diazomethane yields directly, in one step, the oxazoles (5) and (6), respectively.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Quinones; Oximes; Diazomethane; Oxazoles.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000100004
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15N-labed glycine synthesis Anais da ABC (AABC)
Tavares,Claudinéia R.O.; Bendassolli,José A.; Coelho,Fernando; Sant'ana Filho,Carlos R.; Prestes,Clelber V..
This work describes a method for 15N-isotope-labeled glycine synthesis, as well as details about a recovery line for nitrogen residues. To that effect, amination of alpha-haloacids was performed, using carboxylic chloroacetic acid and labeled aqueous ammonia (15NH3). Special care was taken to avoid possible 15NH3 losses, since its production cost is high. In that respect, although the purchase cost of the 13N-labeled compound (radioactive) is lower, the stable tracer produced constitutes an important tool for N cycling studies in living organisms, also minimizing labor and environmental hazards, as well as time limitation problems in field studies. The tests were carried out with three replications, and variable 15NH3(aq) volumes in the reaction were used...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Stable isotope; Glycine; Amino acid.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000300005
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37 years of scientific activity in a Biochemistry Department in Brazil: patterns of growth and factors leading to increased productivity Anais da ABC (AABC)
Gomes,Urubatã E.; Oliveira,Diogo L. de; Berti,Luciana C.; Amaral,Olavo; Souza,Diogo O.; Wofchuk,Susana T..
Scientific activity in Brazil has experienced an accelerated growth in the past decades, with an increase in productivity that greatly surpasses the international average. This growth has occurred mostly at the expense of centers of excellence in public universities, which account for the vast majority of the country's scientific output. The aim of this study was to evaluate the production of the Department of Biochemistry of a large public university in southern Brazil (Universidade Federal do Rio Grande do Sul), as well as to identify internal and external policies that have influenced this growing production profile. We have performed a historical analysis of the scientific output of this Department of Biochemistry, which accounts for a considerable...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Scientific productivity; Scientific growth profile; Biochemistry; UFRGS.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300030
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40Ar/39Ar ages (600-570 Ma) of the Serra do Azeite transtensional shear zone: evidence for syncontractional extension in the Cajati area, southern Ribeira belt Anais da ABC (AABC)
Machado,Rômulo; Dehler,Nolan M.; Vasconcelos,Paulo.
This paper presents 40Ar/39Ar ages of the rocks from the Serra do Azeite transtensional shear zone in the southern part of the Ribeira belt, between the States of São Paulo and Paraná, and also discusses the regional correlations and the tectonic implications for other parts of the belt. The geochronological data suggest that transtensional deformation was active between 600 and 580 Ma (hornblende and muscovite apparent ages, respectively). This time span is considerably older than previous proposals for the period of activity of these structures (520-480 Ma) in the northern segment of this belt and in the Araçuaí belt. Kinematic analysis of the dated mylonites shows extensional structures with top-down movement to ESE compatible with structures found in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Syncontractional extension; 40Ar/39Ar ages; Ribeira belt.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000400011
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40Ar/39Ar geochronology at the Instituto de Geociências, USP: instrumentation, analytical procedures, and calibration Anais da ABC (AABC)
VASCONCELOS,PAULO M.; ONOE,ARTUR T.; KAWASHITA,KOJI; SOARES,ADALBERTO J.; TEIXEIRA,WILSON.
Laser heating 40Ar/39Ar geochronology provides high analytical precision and accuracy, mum-scale spatial resolution, and statistically significant data sets for the study of geological and planetary processes. A newly commissioned 40Ar/39Ar laboratory at CPGeo/USP, São Paulo, Brazil, equips the Brazilian scientific community with a new powerful tool applicable to the study of geological and cosmochemical processes. Detailed information about laboratory layout, environmental conditions, and instrumentation provides the necessary parameters for the evaluation of the CPGeo/USP 40Ar/39Ar suitability to a diverse range of applications. Details about analytical procedures, including mineral separation, irradiation at the IPEN/CNEN reactor at USP, and mass...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Geochronology; 40Ar/39Ar method; Irradiation; Calibration.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000200008
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(4S)-4,8-dihydroxy-1-tetralone and other chemical constituents from Pestalotiopsis sp. EJC07, endophytic fromBauhinia guianensis Anais da ABC (AABC)
Souza,Eleane M.C. de; Silva,Ellon L. Da; Marinho,Andrey M.R.; Marinho,Patrícia S.B..
The present work reports the isolation of eight compounds fromPestalotiopsis sp. EJC07 isolated as endophytic fromBauhinia guianensis, a tipical plant of the Amazon. The compounds (4S)-4,8-dihydroxy-1-tetralone (1), uracil (2), uridin (3), p-hydroxybenzoic acid (4), ergosterol (5), ergosterol peroxide (6), cerevisterol (7) and ducitol (8) were isolated by chromatographic procedures and identified by spectral methods of 1D and 2D NMR and MS. The compound 1 is being reported for the first time in the genusPestalotiopsis.
Tipo: Info:eu-repo/semantics/article Palavras-chave: B. guianensis; Endophityc fungus; Pestalotiopsis; Tetralone.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100029
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A bone fragment of a probable aquatic vertebrate in the Serra Alta Formation (upper permian of Paraná Basin) Anais da ABC (AABC)
HACHIRO,JORGE; GIANNINI,PAULO C.F.; KINJO,RENATA N..
Tipo: Info:eu-repo/semantics/other
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000300024
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A brief note on the paleofauna of "Tartaruguito site", Adamantina Formation, Bauru Group, Brazil Anais da ABC (AABC)
HENRIQUES,DEISE D.R.; SUÁRES,JOSÉ M.; AZEVEDO,SERGIO A.K.; CAPILLA,RAMSES; CARVALHO,LUCIANA B..
Tipo: Info:eu-repo/semantics/other
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000200019
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A brief report on some health aspects of rats fed with crescent levels of recombinant chagasin, a potential plant defense protein Anais da ABC (AABC)
Oliveira Neto,Osmundo B.; Farias,Davi F.; Vasconcelos,Ilka M.; Paes,Norma S.; Monteiro,Ana C. S.; Silva,Maria C. M. da; Guimarães,Luciane M.; Carvalho,Ana F.U.; Grossi-de-Sá,Maria F..
Chagasin may be considered a potential plant-incorporated protectant (PIP) protein due to its deleterious effects on insect pests. However, extensive safety studies with PIP's are necessary before introducing them into the target plant. Thus, a short-term feeding trial in rats with high doses of r-chagasin was conducted to provide evidences about its safety. Three test diets containing casein + r-chagasin (0.25, 0.5 and 1% of total protein) were offered to rats (10 days). The test diets did not show adverse effects upon the development, organ weight, hematological parameters and serum protein profiles of rats, providing preliminary information on the safety of r-chagasin.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chagasin; Recombinant protein; Hazard potential; Short-term rat feeding trial.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000100019
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A closer look at the Impact Factor (JCR 2012): problems, concerns and actions needed Anais da ABC (AABC)
KELLNER,ALEXANDER W.A.; AZEVEDO,RICARDO A..
Tipo: Info:eu-repo/semantics/other
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000300859
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A comparative expression analysis of gene transcripts in brain tissue of non-transgenic and GH-transgenic zebrafish (Danio rerio) using a DDRT-PCR approach Anais da ABC (AABC)
Alves-Costa,Fernanda A.; Figueiredo,Márcio A.; Lanes,Carlos F.C.; Almeida,Daniela V.; Marins,Luis F.; Wasko,Adriane P..
The presence of higher level of exogenous growth hormone (GH) in transgenic animals could lead to several physiological alterations. A GH transgenic zebrafish (Danio rerio) line was compared to nontransgenic (NT) samples of the species through a DDRT-PCR approach, with the goal of identifying candidate differentially expressed transcripts in brain tissues that could be involved in GH overexpression. Densitometric analyses of two selected amplification products, p300 and ADCY2, pointed to a significant lower gene expression in the transgenic zebrafish (104.02 ± 57.71; 224.10 ± 91.73) when compared to NT samples (249.75 ± 30.08; 342.95 ± 65.19). The present data indicate that p300 and ADCY2 are involved in a regulation system for GH when high circulating...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Differential display; GH; Growth hormone; Transgenic; Zebrafish.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200017
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A comparative study of nutritional composition and potential use of some underutilized tropical fruits of Arecaceae Anais da ABC (AABC)
SILVA,RAQUEL B.; SILVA-JÚNIOR,EDVALDO V.; RODRIGUES,LAÍS C.; ANDRADE,LAISE H.C.; SILVA,SUZENE I. DA; HARAND,WOLFGANG; OLIVEIRA,ANTONIO F.M..
In this study, pulp and kernel of fruits from six Arecaceae species were subjected to proximate analysis, fatty acid composition and total carotenoid content analysis. The species with the highest carbohydrate, lipid and protein values were Ptychosperma macarthurii(70.1 g/100 g in the kernel), Syagrus cearensis(40.6 g/100 g in the kernel), andS. coronata(20.6 g/100 g in the pulp). The ash content ranged from 0.61 to 7.51 g/100 g. Lauric, palmitic, and oleic acids were the major fatty acids identified. The total carotenoid contents and retinol activity equivalents were highest in the Pinanga kuhlii (180.3 µg/g) andAcrocomia intumescens (138.0 µg/g) pulp oils. Retinol activity equivalents varied between the investigated species (456 to 1515 μg RAE/100 g)....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biomass; Foods; Oleic acid; Palm trees.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401701
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A comparative study: use of a Brain-computer Interface (BCI) device by people with cerebral palsy in interaction with computers Anais da ABC (AABC)
Heidrich,Regina O.; Jensen,Emely; Rebelo,Francisco; Oliveira,Tiago.
ABSTRACT This article presents a comparative study among people with cerebral palsy and healthy controls, of various ages, using a Brain-computer Interface (BCI) device. The research is qualitative in its approach. Researchers worked with Observational Case Studies. People with cerebral palsy and healthy controls were evaluated in Portugal and in Brazil. The study aimed to develop a study for product evaluation in order to perceive whether people with cerebral palsy could interact with the computer and compare whether their performance is similar to that of healthy controls when using the Brain-computer Interface. Ultimately, it was found that there are no significant differences between people with cerebral palsy in the two countries, as well as between...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brain-computer Interface (BCI); Cerebral palsy; Cognitive ergonomics; Interaction.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000501929
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A comparison for a multiscale study of structural lineaments in southern Brazil: LANDSAT-7 ETM+ and shaded relief images from SRTM3-DEM Anais da ABC (AABC)
Jacques,Patricia D.; Machado,Romulo; Nummer,Alexis R..
This paper presents a comparison of descriptive statistics obtained for brittle structural lineaments extracted manually from LANDSAT images and shaded relief images from SRTM 3 DEM at 1:100, 000 and 1:500, 000 scales. The selected area is located in the southern of Brazil and comprises Precambrian rocks and stratigraphic units of the Paraná Basin. The application of this methodology shows that the visual interpretation depends on the kind of remote sensing image. The resulting descriptive statistics obtained for lineaments extracted from the images do not follow the same pattern according to the scale adopted. The main direction obtained for Proterozoic rocks using both image types at a 1:500, 000 scale are close to NS±10, whereas at a 1:100, 000 scale...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Landsat images; Remote sensing; SRTM; Santa Catarina; Statistics; Structural lineaments.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400008
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A contribution to the identification of charcoal origin in Brazil II - Macroscopic characterization of Cerrado species Anais da ABC (AABC)
GONÇALVES,THAÍS A.P.; NISGOSKI,SILVANA; OLIVEIRA,JULIA S.; MARCATI,CARMEN R.; BALLARIN,ADRIANO W.; MUÑIZ,GRACIELA I.B..
The Brazilian Cerrado is the richest savanna in the world. It is also one of the biomes more threatened in the country and a hotspot for conservation priorities. The main causes of deforestation in Cerrado are agricultural practices, livestock and charcoal production. Although charcoal has a minor impact, its consumption represents the deforestation of 16.000 Km² of the Cerrado. To contribute for the biomes's conservation it is very important to improve forestry supervision. Thus, in this work we present the macroscopic characterization of charcoal from 25 Cerrado's species. We simulate the real conditions of forest controllers by using the magnifications of 10x, 25x and 65x. Likewise, the charcoals micrographs are all of transverse sections due to the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Charcoal anatomy; Nature conservancy; Forest control; Native species.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000301045
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A critical evaluation of coastal erosion in Rio Grande do Sul, Southern Brazil Anais da ABC (AABC)
Dillenburg,Sérgio R.; Esteves,Luciana S.; Tomazelli,Luiz J..
Evidences of coastal erosion in Rio Grande do Sul have been obtained by three methods: (a) analysis of the long-term morphodynamics and stratigraphy of coastal barriers, (b) annual shoreline mapping using the Differential Global Positioning System (DGPS), and (c) local beach profile measurements. The first method reflects coastal erosion as continuity of the geological evolution in the last 5 ka, taking place mainly along the southern half of gentle coastal projections. The second method represents a shorter temporal scale and indicates that approximately 80% of the coast is eroding. Beach profiling has been measured in very few places that are distant from each other since the early 1990s; consequently, their results reflect local and very short time...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coastal evolution; Quaternary; Shoreline changes; Coastal barriers; Sediment budget.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000300014
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A decoding method of an n length binary BCH code through (n + 1)n length binary cyclic code Anais da ABC (AABC)
SHAH,TARIQ; KHAN,MUBASHAR; ANDRADE,ANTONIO A. DE.
For a given binary BCH code Cn of length n = 2s - 1 generated by a polynomial of degree r there is no binary BCH code of length (n + 1)n generated by a generalized polynomial of degree 2r. However, it does exist a binary cyclic code C(n+1)n of length (n + 1)n such that the binary BCH code Cn is embedded in C(n+1)n. Accordingly a high code rate is attained through a binary cyclic code C(n+1)n for a binary BCH code Cn. Furthermore, an algorithm proposed facilitates in a decoding of a binary BCH code Cn through the decoding of a binary cyclic code C(n+1)n, while the codes Cn and C(n+1)n have the same minimum hamming distance.
Tipo: Info:eu-repo/semantics/article Palavras-chave: BCH code; Binary cyclic code; Binary Hamming code; Decoding algorithm.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000300863
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A diachronic view of the net longshore sediment drift during the Late Holocene at the Jequitinhonha River delta, Brazil, using numerical modeling Anais da ABC (AABC)
Bittencourt,Abilio C.S.P.; Dominguez,José M.L.; Tanajura,Clemente A.S.; Silva,Iracema R.; Martin,Louis.
Using numerical modeling, this work estimates sediment dispersion patterns caused by the incidence of waves in five distinct coastline contours of the Jequitinhonha River delta plain during the Late Holocene. For this study, a wave cliate odel based on the construction of ave refraction diagras relative to the current boundary conditions as defined and assumed to be valid for the five coastlines. Numerical modeling from the refraction diagrams was carried out considering the angle of incidence and wave height along the coastline. This work has allowed us to reproduce past and current patterns of net longshore sediment drift defined by a conceptual model developed from the integration of sediment cores, aerial photograph interpretation, C14 datings and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Past and current longshore transport; Wave refraction; Numerical modeling; Holocene; Brazil.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400008
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A duality result between the minimal surface equation and the maximal surface equation Anais da ABC (AABC)
ALÍAS,LUIS J.; PALMER,BENNETT.
In this note we show how classical Bernstein's theorem on minimal surfaces in the Euclidean space can be seen as a consequence of Calabi-Bernstein's theorem on maximal surfaces in the Lorentz-Minkowski space (and viceversa). This follows from a simple but nice duality between solutions to their corresponding differential equations.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Minimal surface equation; Maximal surface equation; Bernstein's theorem; Calabi-Bernstein's theorem.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000200002
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A fast algorithm for computing the Hartley/ Fourier spectrum Anais da ABC (AABC)
OLIVEIRA,HELIO M. DE; SOUZA,RICARDO M. C. DE.
Tipo: Info:eu-repo/semantics/other
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300025
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