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Search Results: 1 - 10 of 21483 matches for " Geraldo Wilson;Rosa "
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Distribution of the endophytic fungi community in leaves of Bauhinia brevipes (Fabaceae)
Hilarino, Mariana Patrícia Amorim;Silveira, Fernando Augusto de Oliveira e;Oki, Yumi;Rodrigues, Leonardo;Santos, Jean Carlos;Corrêa Junior, Ary;Fernandes, Geraldo Wilson;Rosa, Carlos Augusto;
Acta Botanica Brasilica , 2011, DOI: 10.1590/S0102-33062011000400008
Abstract: endophytic fungi represent large, yet unexplored components of biodiversity. this work evaluated the richness and the distribution of endophytes in the leaves of bauhinia brevipes (fabaceae). a total of 1110 colonies were recovered from the samples and grouped by their morphological traits into 126 taxa. the total number of taxa according to leaf development was: 102 in mature leaves, 93 in recently expanded leaves and 79 for unfolded leaves. the major endophyte genera were phomopsis, followed by dothiorella, pestalotiopsis and acremonium. the richness and the isolate numbers of endophytes were not statistically affected by leaf region. however, some taxa were leaf-age specific; six were isolated only from unfolded leaves, nine from recently expanded leaves and 17 were exclusively found in mature leaves. the composition of endophytes varied with leaf region; the similarities (jaccard's index) among the leaf regions of different leaf ages ranged from 0.36 to 0.46, indicating a high spatial variation in the community of endophytic fungi inside the leaves. the high richness of endophytes in this host plant highlights a significant contribution of fungi to tropical biodiversity and the need for further research in this area.
Inclusion of guava wastes in feed for broiler chickens
Lira, Rosa Cavalcante;Rabello, Carlos B?a-Viagem;Ferreira, Paulo Vanderlei;Lana, Geraldo Roberto Quint?o;Lüdke, Jorge Vitor;Dutra Junior, Wilson Moreira;
Revista Brasileira de Zootecnia , 2009, DOI: 10.1590/S1516-35982009001200016
Abstract: the objective of this study was to evaluate the effect of including guava wastes in the feed on the performance and carcass yield of broiler chickens. an experiment was carried out with 300 male cobb strain chicks, in a randomized complete design with five levels of waste and five replications. a reference diet based on corn and soybean meal and four feeds with 3, 6, 9 or 12% guava waste were evaluated. the feed intake, weight gain and feed conversion were assessed weekly; the weight at slaughter and the weight and yield of eviscerated carcass, carcass without feet and head, breast, drumstick, thigh, wing, back, edible viscera and abdominal fat were assessed. the inclusion of guava waste in the feed promotes performance and carcass yield similar to that obtained with the feed based on corn and soybean meal, therefore this agro-industrial by-product can be used at levels of up to 12% in feeds for broiler chickens.
The potential of natural regeneration of rocky outcrop vegetation on rupestrian field soils in "Serra do Cipó", Brazil
Medina, Branca Maria Opazo;Fernandes, Geraldo Wilson;
Brazilian Journal of Botany , 2007, DOI: 10.1590/S0100-84042007000400011
Abstract: an area's innate potential to regenerate represents a crucial factor for its conservation and management. the seed rain and seed bank are important agents in the regeneration process. seed banks are particularly important in communities where there is a high proportion of obligate seeders. rocky outcrops are habitats where most part of the plant species depends on their seeds to reproduce and maintain viable populations. therefore, seed banks ought to be important in this vegetation physiognomy. we test the hypotheses that the seed bank of the rocky outcrops found in the rupestrian fields of "serra do cipó", brazil, is richer in species and denser than those formed on different vegetation physiognomies neighboring the outcrops. we then compared species abundance, species richness and composition in the rocky outcrops' seed banks with those of sandy and peaty bogs, forests, gallery forests, and "cerrados". furthermore, we report on the natural regeneration potential of these soils by assessing a greenhouse study on seedling emergence. soil samples were collected from 0 to 5 and 5 to 10 cm of depth. rocky outcrops had the poorest in species and less dense seed bank and showed segregation in species composition. emergence was greater in the most superficial layer. however, soils on rocky outcrops showed the greatest proportion of endemic threatened species in their seed banks, demonstrating their importance for biodiversity conservation of the "serra do cipó" rupestrian fields.
A new genus and species of gall midge (Diptera, Cecidomyiidae) associated with Parkia pendula (Fabaceae, Mimosoideae)
Maia, Valéria Cid;Fernandes, Geraldo Wilson;
Revista Brasileira de Entomologia , 2006, DOI: 10.1590/S0085-56262006000100001
Abstract: parkiamyia paraensis, a new genus and species of cecidomyiidae that induces galls on parkia pendula is described (larva, pupa, male,female and gall) based on material from pará (brazil).
Gall-inducing insects in terra firme forest and reforested areas in eastern Amazon, Pará, Brazil
Emmanuel Duarte Almada,Geraldo Wilson Afonso Fernandes
Boletim do Museu Paraense Emílio Goeldi : Ciências Naturais , 2011,
Abstract: For the first time, data on the occurrence and richness of gall inducing insects and their host plants in a terra firme forestin the Oriental Amazon region, Porto Trombetas, Pará, Brazil are presented. In 1981 the mining company Minera o Rio do Norte, started a restoration project with native species in areas mined for bauxite. Samples of galls were taken in the dry and the wet seasons of 2002; in 36 reforested sites (from recently planted to 21 years) and in seven primary forest sites. Three hundred and nine different morphotypes of insect galls on 255 host plant species belonging to 45plant families were recorded. The most frequent galling taxa were Diptera of the Cecidomyiidae family (97%), followedby Coleoptera, Hymenoptera, and Lepidoptera. The host plant families most attacked by galling insects were: Fabaceae (87), Chrysobalanaceae (12), Burseraceae (18), Annonaceae (15), Clusiaceae (15), Euphorbiaceae (9), Melastomatacaeae (13), Malpighiaceae (17), Anacardiaceae (11), and Apocynaceae (7). The data indicate a high richness of gall inducing insects when compared to other vegetation types in Brazil (e.g., cerrado and Atlantic rain forest).
Early Double-Negative Thymocyte Export in Trypanosoma cruzi Infection Is Restricted by Sphingosine Receptors and Associated with Human Chagas Disease
Ailin Lepletier,Liliane de Almeida,Leonardo Santos,Luzia da Silva Sampaio,Bruno Paredes,Florencia Belén González,Célio Geraldo Freire-de-Lima,Juan Beloscar,Oscar Bottasso,Marcelo Einicker-Lamas,Ana Rosa Pérez,Wilson Savino,Alexandre Morrot
PLOS Neglected Tropical Diseases , 2014, DOI: 10.1371/journal.pntd.0003203
Abstract: The protozoan parasite Trypanosoma cruzi is able to target the thymus and induce alterations of the thymic microenvironmental and lymphoid compartments. Acute infection results in severe atrophy of the organ and early release of immature thymocytes into the periphery. To date, the pathophysiological effects of thymic changes promoted by parasite-inducing premature release of thymocytes to the periphery has remained elusive. Herein, we show that sphingosine-1-phosphate (S1P), a potent mediator of T cell chemotaxis, plays a role in the exit of immature double-negative thymocytes in experimental Chagas disease. In thymuses from T. cruzi-infected mice we detected reduced transcription of the S1P kinase 1 and 2 genes related to S1P biosynthesis, together with increased transcription of the SGPL1 sphingosine-1-lyase gene, whose product inactivates S1P. These changes were associated with reduced intrathymic levels of S1P kinase activity. Interestingly, double-negative thymocytes from infected animals expressed high levels of the S1P receptor during infection, and migrated to lower levels of S1P. Moreover, during T. cruzi infection, this thymocyte subset expresses high levels of IL-17 and TNF-α cytokines upon polyclonal stimulation. In vivo treatment with the S1P receptor antagonist FTY720 resulted in recovery the numbers of double-negative thymocytes in infected thymuses to physiological levels. Finally, we showed increased numbers of double-negative T cells in the peripheral blood in severe cardiac forms of human Chagas disease.
Seed germination ecophysiology of the wild pineapple, Ananas ananassoides (Baker) L.B.Sm. (Bromeliaceae)
Silveira, Fernando Augusto Oliveira;Santos, Jean Carlos;Fernandes, Geraldo Wilson;
Acta Botanica Brasilica , 2010, DOI: 10.1590/S0102-33062010000400026
Abstract: in this study we investigated the effects of light, temperature, and storage on seed germination of the wild pineapple ananasananassoides, an understorey species found in cerrado woodlands. seeds were germinated at temperatures of 15, 20, 25, 30 and 35 oc and a 12-hr photoperiod and continuous darkness for 30-d. seeds were photoblastic and the optimum temperatures for germination were 25 and 30 oc. seeds stored for 12-mo at room temperature and at 4 oc were set to germinate at optimum conditions. germinability of stored seeds did not differ from that of recently collected seeds, regardless of storage temperature, indicating their physiological potential for seed bank formation. our results suggest that as in tropical rainforests, light may be an important factor controlling recruitment from seed banks for small-sized species from the cerrado woodlands.
Comunidades de insetos galhadores (Insecta) em diferentes fisionomias do cerrado em Minas Gerais, Brasil
Gon?alves-Alvim, Silmary J.;Fernandes, Geraldo Wilson;
Revista Brasileira de Zoologia , 2001, DOI: 10.1590/S0101-81752001000500025
Abstract: studies on the communities of galling insects and their host plants were performed in three "cerrado" physiognomies that occur in minas gerais: "campo sujo", "cerrado" sensu strictu, and "cerrad?o". galls and host plants were collected along transects in a total of 3,000 herbs, 300 shrubs and 135 trees in each physiognomy. ninety two species of galling insects (morphotypes) on 62 host plant species of 28 families were found. the highest galling insect richness was observed in the "cerrado". approximately 75.0% of galling insects belonged to the cecidomyiidae (diptera). the highest gall frequency was found on leaves (58.70%) of the host plants, and was glabrous (83.70%). most gall shape were elliptic (30.43%). a low similarity in galling insect species was observed among the three sampled physiognomies - the highest similarity index was observed between "cerrado" and "campo sujo" (sφrensen index = 0.20), indicating that the presence of rare species of galling insects might be common in these environments.
CARACTERIZA??O DA FERTILIDADE DOS SOLOS DE QUATRO LEGUMINOSAS DE CAMPOS RUPESTRES, SERRA DO CIPó, MG, BRASIL
Negreiros,Daniel; Borges Moraes,Mateus Lana; Wilson Fernandes,Geraldo;
Revista de la ciencia del suelo y nutrición vegetal , 2008, DOI: 10.4067/S0718-27912008000300003
Abstract: the goal of the present study was to characterize the nutritional quality of the soils colonized by four endemic leguminous shrubs of serra do cipo, southeastern brazil: calliandra fasciculata benth., chamaecrista ramosa (vog.), collaea cipoensis fortunato and mimosa foliolosa benth. a mixed soil sample collected between 0 and 15cm depth was obtained in four subpopulations of each species. each mixed sample resulted from the combination of 20 simple samples (four samples of five adult individuals) in each subpopulation. routine, organic matter, micronutrients, and granulometric analysis were performed for each sample. the soils colonized by the four species were sandy, acidic, deficient in all macronutrients, and with high aluminum saturation. however, the levels of organic matter, zinc, iron, and bore ranged from medium to high. there was no significant difference in organic matter, phosphorus, iron, bore, sulphur, potential acidity, and granulometric parameters among the soils of the four species. the results of the present study corroborate previous studies in rupestrian field soils of serra do cipo. management plans and land rehabilitation programs should keep the conditions of low soil fertility because the endemic flora adapt well on these soils and may have increased competitive ability under these nutritional ranges.
CARACTERIZA O DA FERTILIDADE DOS SOLOS DE QUATRO LEGUMINOSAS DE CAMPOS RUPESTRES, SERRA DO CIPó, MG, BRASIL Characterization of soil fertility of four leguminous shrubs of rupestrian fields, Serra do Cipo, MG, Brazil
Daniel Negreiros,Mateus Lana Borges Moraes,Geraldo Wilson Fernandes
Revista de la Ciencia del Suelo y Nutrición Vegetal , 2008,
Abstract: O presente trabalho teve como objetivo caracterizar a qualidade nutricional dos solos de popula es naturais de quatro especies de leguminosas de campo rupestre: Calliandra fasciculata Benth., Chamaecrista ramosa (Vog.), Collaea cipoensis Fortunato e Mimosa foliolosa Benth. Urna amostra composta de solo na profundidade de 0 a 15cm foi coletada em quatro subpopula es de cada especie. Cada amostra composta resultou da coleta de 20 amostras simples (quatro amostras em cinco individuos adultos) por subpopula o. Foram feitas análises de rotina (pH, P, K, Ca21, Mg21, Al31, H+Al), materia organica, micronutrientes e granulométrica. Os solos apresentaram acidez elevada, baixa fertilidade, alta satura o de aluminio e textura predominantemente arenosa. Entretanto, n o foram encontrados baixos teores de materia organica, B, Fe e Zn. Os solos diferiram significativamente entre si nos teores de materia organica, P, Fe, B, H+Al e textura. Os resultados obtidos est o de acordó com outros levantamentos realizados em solos de campo rupestre na Serra do Cipo. Planos de manejo e reabilita o de áreas degradadas em campo rupestre devem procurar manter as condi es de baixa fertilidade desses solos, visto que a flora endémica de campo rupestre mostra boa adapta o a estas condi es, podendo apresentar maior vantagem competitiva dentro desse espectro nutricional. The goal of the present study was to characterize the nutritional quality of the soils colonized by four endemic leguminous shrubs of Serra do Cipo, southeastern Brazil: Calliandra fasciculata Benth., Chamaecrista ramosa (Vog.), Collaea cipoensis Fortunato and Mimosa foliolosa Benth. A mixed soil sample collected between 0 and 15cm depth was obtained in four subpopulations of each species. Each mixed sample resulted from the combination of 20 simple samples (four samples of five adult individuals) in each subpopulation. Routine, organic matter, micronutrients, and granulometric analysis were performed for each sample. The soils colonized by the four species were sandy, acidic, deficient in all macronutrients, and with high aluminum saturation. However, the levels of organic matter, zinc, iron, and bore ranged from medium to high. There was no significant difference in organic matter, phosphorus, iron, bore, sulphur, potential acidity, and granulometric parameters among the soils of the four species. The results of the present study corroborate previous studies in rupestrian field soils of Serra do Cipo. Management plans and land rehabilitation programs should keep the conditions of low soil fertility because the
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