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Search Results: 1 - 10 of 164240 matches for " Ricardo F.;Macedo "
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Preda??o de sementes de Allagoptera arenaria (Gomes) O'Kuntze (Arecaceae) por Pachymerus nucleorum Fabricius (Coleoptera, Chrysomelidae, Bruchinae)
Grenha, Viviane;Macedo, Margarete V. de;Monteiro, Ricardo F.;
Revista Brasileira de Entomologia , 2008, DOI: 10.1590/S0085-56262008000100009
Abstract: seed predation on allagoptera arenaria (gomes) o'kuntze, 1891(arecaceae) palm by pachymerus nucleorum fabricius, 1972 was evaluated from september 2003 to september 2005 at the parque nacional da restinga de jurubatiba (pnrj), rio de janeiro, brazil. the biology and behaviour of p. nucleorum on a. arenaria and predation rates were described. fruits found beneath 50 palms were collected, monthly, for each one of the two sampled areas at pnrj (ridge forest and clusia sclthdl (clusiaceae) open shrubland formation). the evaluation of preyed fruits was done by counting exit holes of bruchinae in the field, the emergence of these insects in the laboratory and from fruits dissected. it was verified that pachymerus nucleorum oviposit on young developing infrutescences, different from literature records for other palm species, for which oviposition takes place on the fruit already on the ground. fruit predation by p. nucleorum was 29.3% at ridge forest and 20.6% at clusia open shrubland formation. the life cycle of p. nucleorum was long and with wide range of variation within samples, what suggests a possible diapause in some stage of life cycle.
Zoneamento de risco climático para a cultura do café Conilon no Estado do Espírito Santo
Pezzopane, José Ricardo Macedo;Castro, Fábio da Silveira;Pezzopane, José Eduardo Macedo;Bonomo, Robson;Saraiva, Giselle Sabadim;
Revista Ciência Agron?mica , 2010, DOI: 10.1590/S1806-66902010000300004
Abstract: a frequencial analysis of the crop water requirement index of the conilon coffee (coffea canephora), determined for the occurrence of relative evapotranspiration (etr/eto) > 0.65 above 80% of the years, was carried through for the phenological stages of the flowering, bean formation and vegetative growth. the areas with climatic risk of water deficit were zoned by a geographic information system considering simultaneously the three phenological stages. the results showed that due to heterogeneous rain characteristics, associate to the different water requirements, occurs a space variation of the climatic risk to the water required in the state. in analysis of water required in the different phonological stages of the conilon coffee, it was identified that 58% of the area of the state of espirito santo, mainly in the north part, presents high climatic risk of water required in the phases of the flowering, bean formation and vegetative growth.
Composi??o, abundancia e notas sobre a ecologia de espécies de larvas de lepidópteros associadas a cinco espécies de plantas hospedeiras no Parque Nacional da Restinga de Jurubatiba, RJ
Monteiro, Ricardo F.;Macedo, Margarete V.;Nascimento, Milena de S.;Cury, Rafael S. F.;
Revista Brasileira de Entomologia , 2007, DOI: 10.1590/S0085-56262007000400012
Abstract: in order to describe the species composition, temporal occurrence and ecological aspects of larvae associated with five plant species: erythroxylum ovalifolium and e. subsessile (erythroxylaceae), manilkara subsericea (sapotaceae), protium icicariba and p. heptaphyllum (burseraceae), 1.680 plants were bimonthly surveyed from july of 2003 to august of 2005 in the parque nacional da restinga de jurubatiba (pnrj). thirty two species of lepidoptera were reared from these five host plants, and the most abundant four species belonged to the elachistidae. manilkara subsericea showed the greatest number of lepidoptera species associated, 14 species, followed by e. ovalifolium (10 species), p. icicariba (seven species), e. subsessile (six species) and p. heptaphyllum (two species). only one out of the 32 species of lepidoptera was gregarious and 56% used any kind of shelter to get food or for defence. six lepidoptera species (27%) were polyphagous, three (14%) oligophagous and 13 (59%) had just only one host plant species recorded. the most abundant species of moths exhibitted two reproductives periods in the year, predominantly in winter and autumn. abiotic factors, such as strong insolation during spring and summer in the open scrub vegetation of restinga, may be very important in producing this temporal pattern of insect reproduction, but we cannot neglect biotic factors like natural enemies.
The role of Cerradomys Subflavus (Rodentia, Cricetidae) as seed predator and disperser of the palm Allagoptera arenaria
Grenha,Viviane; Macedo,Margarete V.; Pires,Alexandra S.; Monteiro,Ricardo F.;
Mastozoolog?-a neotropical , 2010,
Abstract: small rodents are among the most abundant vertebrate seed predators in the tropics and palm fruits are a rich source of energy for them. allagoptera arenaria is a nurse plant species at restinga vegetation in southeastern brazil. forty-five adult a. arenaria were marked to estimate fruit crop size and seed predation by rodents. two trapping sessions were carried out to identify the rodent seed predators. in addition, a fruit removal experiment was conducted to investigate the role of rodents as seed dispersers. of the 7409 seeds collected, 24% were damaged by rodents. predation rates ranged from 0 to 64% per plant and the number and the proportion of damaged seeds increased significantly with crop size. in the removal experiments, 64% of the fruits were manipulated by rodents either in situ or away from palms: 16% were preyed in the same place, 29% were preyed following removal, 2% were dispersed and 12% were buried. seed fate could not be identified for 5% of the seeds. cerradomys subflavus was the only species caught and this fact together with its abundance in the study area and tooth marks left in the endocarps indicates that this rodent is the main seed predator of this palm. considering this, c. subflavus should play a key role in a. arenaria population dynamics through the reduction of the total number of seeds that may be recruited. however, seed burial in sites favorable for germination suggests that this rodent can act also as seed disperser of this palm.
Dor torácica por compress o atrial direita por timolipoma
Ramos Filho José,Melo Ricardo F.,Macedo Marcelo de,Fiorelli Luiz Ant?nio
Arquivos Brasileiros de Cardiologia , 2004,
Viviane Grenha,Margarete V. Macedo,Alexandra S. Pires,Ricardo F. Monteiro
Mastozoolog?-a neotropical , 2010,
Abstract: Algunos peque os roedores están entre los vertebrados depredadores de semillas más abundantes en los trópicos y las semillas de palmas son una rica fuente de energía para ellos. Allagoptera arenaria es una planta facilitadora de la vegetación en restingas en el sudeste de Brasil. Cuarenta y cinco palmas adultas de A. arenaria fueron marcadas para estimar la producción de frutos y la depredación de semillas por roedores. Dos sesiones de trampeo fueron conducidas para identificar los roedores depredadores de semillas. Adicionalmente, un experimento de remoción de frutos fue conducido para investigar el papel de los roedores como dispersores de semillas. De las 7409 semillas colectadas el 24% fue da ada por roedores. Las tasas de depredación variaron de 0 a 99% por planta y el número y proporción de semillas da adas aumentó significativamente con la producción de frutos. En los experimentos de remoción, 64% de los frutos fueron manipulados por roedores in situ o distante de las plantas madres: 16% fueron depredadas in situ, 29% fueron depredadas después de removidas, 2% fueron dispersadas y 12% fueron enterradas. El destino de las semillas no pudo ser identificado para 5% de las semillas. Cerradomys subflavus fue la única especiecapturada y este hecho, junto con su abundancia en la área de estudio y las marcas de alimentación dejadas en los endocarpios, indican que sería el principal depredador de semillas en esta palma. C. subflavus puede estar desempe ando un papel clave en la dinámica poblacional de A. arenaria por la reducción del total de semillas que pueden ser reclutadas. Además, el enterramiento de las mismas en situaciones favorables para germinación indica que este roedor puede también actuar como dispersor.
Antioxidative responses of cell suspension cultures of two Coffea arabica varieties to low aluminum levels at pH 5.8
Bottcher, Alexandra;Nobile, Paula Macedo;Martins, Paula Fabiane;Conte, Fábio Frangiotti;Azevedo, Ricardo Antunes;Mazzafera, Paulo;
Hoehnea , 2012, DOI: 10.1590/S2236-89062012000100001
Abstract: the effects of aluminum (al) on the activities of antioxidant enzymes and ferritin expression were studied in cell suspension cultures of two varieties of coffea arabica, mundo novo and icatu, in medium with ph at 5.8. the cells were incubated with 300 μm al3+, and the al speciation as al3+ was 1.45% of the mole fraction. the activities of superoxide dismutase (sod), catalase (cat), and glutathione s-transferase (gst) were increased in mundo novo, whereas glutathione reductase (gr) and guaiacol peroxidase (gpox) activities remained unchanged. sod, gr, and gst activities were increased in icatu, while cat activity was not changed, and gpox activity decreased. the expression of two ferritin genes (cafer1 and cafer2) were analyzed by real-time pcr. al caused a downregulation of cafer1 expression and no changes of cafer2 expression in both varieties. the western blot showed no alteration in ferritin protein levels in mundo novo and a decrease in icatu. the differential enzymes responses indicate that the response to al is variety-dependent.
Fossilization in Geopark Araripe studied through X-ray diffraction, scanning microscopy and thermogravimetric analysis
Ricardo J. C. Lima,Paulo T. C. Freire,Zélia S. Macedo,José M. Sasaki,Ant?nio A. F. Saraiva
Physics , 2008,
Abstract: The Geopark Araripe, located in Northeastern Brazil, is the first UNESCO Natural Park in the South hemisphere and a world-famous fossil deposit of the Early Cretaceous period (approximately 120 million years). Fossilized fish fauna in Geopark Araripe is found inside of sedimentary rocks in three-dimensional forms. In the present study sedimentary rocks and fossil fish Rhacolepis bucalis have been carefully analysed by means of X-ray powder diffraction, scanning electron microscopy and termogravimetric analysis. Mineralogical composition of the fossil fish was explained in terms of facts occurred at the initial stages of the opening of the South Atlantic and the oceanic hydrothermal phenomena (``black smoker'', ``white smoker'' and warm-water events). The occurrence of organic substance was, for the first time, evaluated in collapsed internal elements (intestinal and muscles) by termogravimetric analysis.
Compara??o entre avalia??o objetiva e autoavalia??o da matura??o sexual em crian?as e adolescentes
Azevedo, Jenner C. V.;Brasil, Lana M. P.;Macedo, Taísa B. M. A.;Pedrosa, Lucia F. C.;Arrais, Ricardo F.;
Jornal de Pediatria , 2009, DOI: 10.1590/S0021-75572009000200009
Abstract: objective: to assess the correlations between objective assessment and self-assessment of sexual maturation in the outpatient and school settings. methods: three hundred and nineteen individuals, 178 (96 boys and 82 girls) from an outpatient clinic and 141 (73 boys and 68 girls) from public schools (8.3-18.7 years), of whom 73 individuals (39 girls an d 34 boys) had a body mass index above the 85th percentile, according to 2000 cdc growth chart, were analyzed. all of them were examined sequentially and individually by two trained physicians after a written consent form was signed by parents or surrogates, and then submitted to self-assessment using pictures (tanner stages). kappa coefficients between examiners and the self-assessment were calculated based on the collected data. a p value < 5% was established as statistically significant. results: no significant difference was observed between correlations obtained from the outpatient clinic and schools, and both groups were combined for analysis. the correlations obtained by examiners were significantly higher than those from self-assessment, with a kappa coefficient (and confidence interval) of 0.75 (0.8-0.69) for breasts/genitals across examiners against 0.27 (0.34-0.20) and 0.29 (0.36-0.22) between the two examiners and the self-assessment (p < 0.0001). conclusions: in the studied sample, self-assessment of the pubertal stage should not replace the objective assessment made by trained professionals. improvement of the self-assessment method may validate its use in population-based studies.
Antioxidant activity from the leaf extracts of Jacaranda puberula Cham., Bignoniaceae, a Brazilian medicinal plant used for blood depuration
Santos, Paula Macedo Lessa dos;Japp, Alberto Sadda;Lima, Lívia Gralato;Schripsema, Jan;Menezes, Fábio de Sousa;Kuster, Ricardo Machado;
Revista Brasileira de Farmacognosia , 2010, DOI: 10.1590/S0102-695X2010000200002
Abstract: the antioxidant activity of leaf extracts from jacaranda puberula cham., bignoniaceae, was assayed by the dpph (2,2-diphenyl-1-picryl-hydrazyl) free radical scavenging method. three phytomedicines (f1, f2, and f3) used as blood depurative, were tested by the same method. the free radical scavenger potential was measured by the discoloration of the solution. the ec50 values from gingko bilobaegb 761? extract and rutin, used as antioxidant for medical purposes, were used as reference. the ethanol extract (ee), ethyl acetate (ea), butanol (eb), aqueous (eaq) and the sample a (obtained from extract eb), showed lower ec50 values than other extracts and phytomedicines. the antioxidant activity (aa) of the extracts was related with the presence of the polyphenol compounds such as verbascoside (1) and cis-caffeoyl aldehyde (2). these structures were determined by chemical and spectroscopic methods and comparison with literature data.
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