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Search Results: 1 - 10 of 10678 matches for " Aguiar-Dias "
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Elaphoglossum (Dryopteridaceae-Fern) of Amazon Rainforest in Brazil: Anatomic Characterization and Adaptative Strategies  [PDF]
Ana Carla Feio, Ana Cristina Andrade de Aguiar-Dias, Raimunda Concei??o de Vilhena Potiguara
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.49229
Abstract:

This study describes the anatomy of sterile leaves of Elaphoglossum discolor (Kuhn) C. Chr., E. flaccidum (Fée) T. Moore and E. laminarioides (Bory ex Fée) T. Moore, the most representative species of the genus in the Ecological Park of Gunma in Pará State. It reports the main diagnostic characters and provides new systematic data for the group. In addition, it locates the production and accumulation sites of bioactive compounds to determine possible adaptive strategies of these species in the Amazon rainforest environment. Diagnostic structural features include stoma typology, central veins and margin forms, type of mesophyll, and the presence of schlerenchymatous sheaths in the cortex, among others. Among the bioactive compounds related to defense adaptation are phenolic compounds, which occur in all three species, and alkaloids and mucilage, which are exclusive to E. laminarioides. Of the three species studied, E. laminarioides has features that make it the best suited to the rainforest environment.

Anatomia foliar de cinco espécies de Polygala de restinga e cerrado
Aguiar-Dias, Ana Cristina Andrade de;Yamamoto, Kikyo;Castro, Marília de Moraes;
Rodriguésia , 2012, DOI: 10.1590/S2175-78602012000200012
Abstract: the ecological plasticity observed in plants that inhabit different vegetation formations is often accompanied by morphological variations, the leaf being the vegetative organ with the greatest structural variation. in view of this concept, the leaf anatomy of five species of polygala l. occurring in restinga (sandy coastal plain) and cerrado (savanna) areas in the state of s?o paulo were analyzed in order to inventory their principal characters and describe their leaf structure, to thus compare them and assess the possibility of verifying structural patterns common to the ecological conditions of both vegetation formations. the species studied were: p. cyparissias a.st.-hil. & moq., p. laureola a.st.-hil. & moq., p. paniculata l. found in restinga, and p. angulata dc. and p. violacea aubl. emend. marques occurring in campo cerrado and cerrad?o margin areas, respectively. the middle region of the leaf blade and petiole proximal region of each leaf were processed following the usual techniques for scanning electron and light microscopy. the results show two structural patterns common to the species from the restinga and cerrado area formations: mesomorphic characteristics are observed in p. laureola, p. paniculata, and p. violacea, and xeromorphic in p. cyparissias and p. angulata.
Estruturas secretoras em cipó-d'alho (Mansoa standleyi (Steyerm.) A. H. Gentry, Bignoniaceae): ocorrência e morfologia
Vilhena-Potiguara, Raimunda Concei??o;Aguiar-Dias, Ana Cristina Andrade de;Kikuchi, Tatiani Yuriko Souza;Santos, Ana Carla Feio dos;Silva, Rolf Junior Ferreira;
Acta Amazonica , 2012, DOI: 10.1590/S0044-59672012000300003
Abstract: species of mansoa are called "cipó-d'alho" because of the smell of garlic that wafts from their vegetative and reproductive parts. since data on the morphology and occurrence of their secretory structures are scarce and even absent for m. standleyi, the present work characterizes the distribution and morphology of such structures in the vegetative aerial axis of the latter. to do so, samples of the leaf blade and of nodal regions were fixed and examined using histological and scanning electron microscope techniques. histochemical tests with appropriate controls were carried out on the secretory structures during the secretory phase. fly and ant individuals that visit the species were sampled, preserved and identified by an entomologist. the secretory structures of the vegetative aerial axis of m. standleyi are peltate and patelliform glandular trichomes. all develop asynchronously and are present in the nodal regions and leaf blade, mainly in their youngest parts. trichomes form a secretory complex in the nodal regions while they are scattered in the leaf blade. histochemical analyses revealed that the cupulate and patelliform trichomes are extrafloral nectaries and that the peltate ones present an alkaloid fraction. the visitors of the nodal glands are ants crematogaster (formicidae) and ectatomma brunea (vespoidea, formicidae) and flies oxysarcodexia (sarcophagidae, subfamily utitidae [ulidiidae]). the secretory structures of the vegetative aerial axis of mansoa standleyi are similar to those reported for bignoniaceae. an extrafloral nectary is described for m. standleyi for the first time.
Concentra??o industrial, fus?es e turnover no setor supermercadista brasileiro
Concha-Amin, M?nica;Aguiar, Danilo Rolim Dias de;
Gest?o & Produ??o , 2006, DOI: 10.1590/S0104-530X2006000100005
Abstract: this paper reports on an analysis of the structure of the supermarket sector in brazil from 1991 to 2002. this analysis revealed a growth in market concentration driven by the entry of foreign retail companies and by a considerable increase in mergers and acquisitions in the late 1990s. the turnover was high, but did not, in general, involve the largest groups. although there have been contradictory effects, the structural changes in brazil's retail sector may lead to the abuse of market power on the part of the largest retailers, a possibility that should concern the antitrust authorities.
Prolapso de gordura orbitária bilateral associado a pterígio: relato de caso
Dias, Vanderson Glerian;Cintra, Dino de Aguiar;Gigante, Edmilson;
Arquivos Brasileiros de Oftalmologia , 2006, DOI: 10.1590/S0004-27492006000300027
Abstract: orbital fat prolapse is an uncommon benign entity that can cause esthetic defects. the authors present a 63-year-old patient with bilateral temporal orbital fat prolapse associated with a bilateral nasal pterygium. clinical and surgical features are described. the clinical, imaging and histopathological diagnoses are discussed.
Sobre a natureza dos nomes próprios toponímicos About the nature of toponymic proper names
Maria Célia Dias de Castro ; Maria Suelí de Aguiar
Signótica , 2009, DOI: 10.5216/sig.v21i2.9165
Abstract: Neste trabalho, partimos da teoria clássica sobre a natureza dos nomes e procuramos discorrer historiograficamente acerca dos pensamentos filosóficos que iniciaram esses estudos, desde os plat nicos, na obra “Crátilo”, passando pela discuss o de Whitney até os sempre atuais estudos de Saussure, autores que discutem se os nomes s o formados por motiva o natural (Physei) ou por conven o (Thesei). Relacionamos essa discuss o aos nomes toponímicos dos municípios do Estado do Maranh o, em que procuramos inter-relacionar a influência da estrutura formal do signo linguístico com o objeto que ele representa no processo de nomea o. In this paper, we use classical theory about the nature of names and discuss in a historiographical way the philosophical thoughts that began these studies, starting from the Platonists in “Cratylus”, through Whitney’s discussion up to the always contemporary studies of Saussure. These authors discuss if the names are formed by natural justice (Physei) or by convention (Thesei). We relate this discussion to the toponymical names in the municipalities of Maranh o state. We then inter-relate the influence of the formal structure of the linguistic sign to the object that it represents in the process of naming.
Study of the Reaction Derivatization Glyphosate and Aminomethylphosphonic Acid (AMPA) with N,O-Bis(trimethylsilyl)trifluoroacetamide  [PDF]
T. C. P. G. Catrinck, Maria Clara Santana Aguiar, Amanda Dias, Flaviano Oliveira Silvério, Paulo Henrique Fidêncio, Gevany Paulino de Pinho
American Journal of Analytical Chemistry (AJAC) , 2013, DOI: 10.4236/ajac.2013.411077
Abstract:

This work aimed to study the derivatization unprecedented of glyphosate and AMPA solutions using N,O-bis (trimethylsilyl)trifluoroacetamide (BSTFA) combined with trimethylchlorosilane (TMCS), evaluating the composition of the reaction medium, use of ultrasound, volume of BSTFA:pyridine and pH of the reaction medium. From this study it was inferred that the reaction medium was composed of BSTFA:pyridine in ratio 60:100, respectively, without ultrasonic vibration and pH adjustment that provide optimal conditions for analysis by GC-MS. Furthermore, the methodology used was simple and fast, and that was the most practical method commonly used.

Avalia??o das altera??es bromatológicas e de degradabilidade do resíduo de lixadeira do algod?o após tratamento biológico com Pleurotus sajor-caju
Castro, Ana Luisa Aguiar de;Paiva, Paulo César de Aguiar;Dias, Eustáquio Souza;Santos, Juliana dos;
Ciência e Agrotecnologia , 2004, DOI: 10.1590/S1413-70542004000300017
Abstract: the objective of the experiment was to evaluate the bio-conversion treatment to enhance the nutritional value and degradability of cotton textile mill waste, using the fungi pleurotus sajor-caju. the experiment was conducted at the departments of biology and animal science of the universidade federal de lavras (ufla), between july 2002 and january 2003. bio-conversion was induced by the use of the residue as the main component in a substrate bed for cultivation of edible mushrooms (c1 and c2). in comparison to the untreated cotton textile mill waste, two bio-conversion alternatives by pleurotus sajor-caju were tested. after mushroom production, samples of the treated material were submitted to in situ degradability tests and chemical composition. results indicated that c1 and c2 treatments decreased fibrous fractions (adf and ndf) and increased cp of cotton textile mill waste, improving the chemical composition. c1 and c2 treatments also resulted in an increased of soluble fraction (a), the degradation rate (c), and decreased insoluble potential degradable fraction (b); increasing effective degradability of dm and ndf of cotton textile mill waste.
Brachiaria decumbens supresses the initial growth of Coffea arabica
Dias, Guilherme Faus da Silva;Alves, Pedro Luís da Costa Aguiar;Dias, Tomás Carneiro de Souza;
Scientia Agricola , 2004, DOI: 10.1590/S0103-90162004000600003
Abstract: brachiaria decumbens is becoming one the most common weeds growing in young coffee orchards because, besides its fast growth and difficulty of control, new coffee orchards are usually established in pasture areas. in order to verify the effect of b. decumbens plant density on the early growth of coffee (coffea arabica l. cv. catuaí amarelo), a competition experiment was conducted under semi-controlled humidity conditions. soil collected in a typic haplustox was placed in 70 l asbestos cement boxes and one coffee seedling was planted in each box. the b. decumbens seedlings were transplanted to the boxes at the 2-4 leaf stage. treatments consisted of 0, 4, 8, 12, 16, 20, 24, 36, 48, and 60 weeds m-2. the experimental period started 120 days after transplanting and the experimental design was organized as completely randomized blocks, with four replicates. all coffee plant parameters evaluated were negatively affected by the interference. the most sensitive characteristics were leaf area (41.8% reduction with 8 plants m-2, reaching 68.7% at a density of 60 plants m-2). therefore, at a density of 8 plants m-2 the reduction in leaf dry biomass was 41.4% compared with the check. at the density of 60 plants m-2 it was 72.8%. b. decumbens, at a density of 8 or more plants m-2, suppressed coffee plants during a growth period of 120 days.
Brachiaria decumbens supresses the initial growth of Coffea arabica
Dias Guilherme Faus da Silva,Alves Pedro Luís da Costa Aguiar,Dias Tomás Carneiro de Souza
Scientia Agricola , 2004,
Abstract: Brachiaria decumbens is becoming one the most common weeds growing in young coffee orchards because, besides its fast growth and difficulty of control, new coffee orchards are usually established in pasture areas. In order to verify the effect of B. decumbens plant density on the early growth of coffee (Coffea arabica L. cv. Catuaí Amarelo), a competition experiment was conducted under semi-controlled humidity conditions. Soil collected in a Typic Haplustox was placed in 70 L asbestos cement boxes and one coffee seedling was planted in each box. The B. decumbens seedlings were transplanted to the boxes at the 2-4 leaf stage. Treatments consisted of 0, 4, 8, 12, 16, 20, 24, 36, 48, and 60 weeds m-2. The experimental period started 120 days after transplanting and the experimental design was organized as completely randomized blocks, with four replicates. All coffee plant parameters evaluated were negatively affected by the interference. The most sensitive characteristics were leaf area (41.8% reduction with 8 plants m-2, reaching 68.7% at a density of 60 plants m-2). Therefore, at a density of 8 plants m-2 the reduction in leaf dry biomass was 41.4% compared with the check. At the density of 60 plants m-2 it was 72.8%. B. decumbens, at a density of 8 or more plants m-2, suppressed coffee plants during a growth period of 120 days.
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