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Search Results: 1 - 10 of 11924 matches for " Sousa Nelcimar Reis "
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Contribution of the institutions in the Northern region of Brazil to the development of plant cultivars and their impact on agriculture
Aparecida das Gra?as Claret de Souza,Nelcimar Reis Sousa,Ricardo Lopes,André Luiz Atroch
Crop Breeding and Applied Biotechnology , 2012,
Abstract: This paper describes the development of breeding programs in northern Brazil and their main impacts on agriculture. Their contribution to the breeding of the species palm oil, acai fruit, cacao, cupua u, guarana, tomato, camu-camu, cocona, peach palm, and rubber was laid out in detail. Advances in breeding programs of institutions such as Embrapa, Ceplac, Inpa, and Universities require investments in infrastructure and in human and financial resources to ensure continuity and efficiency in economic, social and environmental gains. The improvement of native species, the main focus of the breeding programs of the institutions in the Northern region of Brazil, is a form of exploiting the Amazonian biodiversity for the benefit of society. Therefore, policies to foster research institutions should be a subject of deliberation and action of the scientific and technological community in Brazil.
Divergência genética entre clones de guaranazeiro
Nascimento Filho Firmino José do,Atroch André Luiz,Sousa Nelcimar Reis de,Garcia Terezinha Batista
Pesquisa Agropecuária Brasileira , 2001,
Abstract: As técnicas multivariadas, para estimar a diversidade genética de um grupo de progenitores, têm sido utilizadas com freqüência pelos melhoristas de plantas. Os progenitores s o utilizados em cruzamentos biparentais ou múltiplos, para forma o de popula es segregantes que tenham maior probabilidade de recupera o de genótipos superiores. Este trabalho foi realizado com o objetivo de identificar clones de guaranazeiro produtivos e divergentes que possam ser utilizados em um programa de cruzamentos para obter híbridos com alto valor heterótico e materiais para propaga o vegetativa. Foram avaliados 148 clones de guaranazeiro atualmente em uso no programa de melhoramento genético da Embrapa-Centro de Pesquisa Agroflorestal da Amaz nia Ocidental. Utilizou-se, para estimativa da divergência genética, a análise de agrupamento, em que a medida de dissimilaridade utilizada foi a distancia euclidiana média padronizada e os métodos de agrupamento de otimiza o de Tocher e do vizinho mais próximo para constru o do dendrograma entre grupos de clones. Houve a forma o de sete grupos divergentes de clones. Concluiu-se que a divergência genética entre os clones n o é grande, pois dois grupos foram formados com dois clones e três grupos foram formados somente com um único clone. Os clones CMU384 e CMU801 foram os mais próximos geneticamente e podem ser utilizados na forma o de uma popula o com desenvolvimento vegetativo uniforme para uso em plantios comerciais.
Indu o de brota o apical em mudas provenientes de sementes e do enraizamento de estacas de mangost ozeiro = Induction of apical bud sprouting in seedlings and rooting of cuttings of mangosteen
Larissa Alexandra Cardoso Moraes,Terezinha Batista Garcia,Nelcimar Reis Sousa,Ad?nis Moreira
Acta Scientiarum : Agronomy , 2007,
Abstract: Com objetivo de induzir a brota o apical de mudas de mangost ozeiro, foi realizado um experimento que consistiu na aplica o de dois reguladores de crescimento: cinetina (0, 100 e 400 mg L-1) e giberelina (50 mg L-1), e outros dois experimentos para obten o de estacas enraizadas: a) aplica o de ácido-indol-3-butírico nas concentra es de 0, 100, 500 e 1000 mg L-1 e b) aplica o de ácido a naftaleno acético na concentra o de 6000 mg L-1. Nesses ensaios foram utilizadas estacas maduras provenientes de ramosortotrópicos. Os resultados indicaram a possibilidade do uso de reguladores para a obten o de porta-enxertos mais uniformes e com menor tempo de forma o, e apesar da baixa taxa de enraizamento, a obten o de mudas de estacas enraizadas de mangost ozeiro obtida comfitorm nios apresenta grande potencial, equivalendo em tamanho a uma muda de um ano proveniente de sementes apomíticas. With the objective to induce apical bud sprouting in youngmangosteen seedlings an experiment was carried out with the application of the plant growth regulators kinetin (0, 100 and 400 mg L-1) and gibberellin GA4+7 (50 mg L-1). To obtain rooted cuttings two other experiments were performed: a) application of indolbutyric acid at the concentrations of 0, 100, 500 and 1000 mg L-1 and b) application of a naphtaleneacetic acid, at 6000 mg L-1. In these trials cutting from orthotropic branches were utilized. The results indicated the possibility of using plant growth regulators to obtainmore uniform root stocks in a shorter nursery stage and, despite the low percentage of rooting the planting material obtained from cuttings has a great practical potential, since the size of the rooting cuttings is equivalent to that of one year old seedlings.
In vitro rescue of interspecific embryos from Elaeis guineensis x E. oleifera (Arecaceae)
Paula Cristina da Silva Angelo,LarissaAlexandra Cardoso Moraes,Ricardo Lopes,Nelcimar Reis Sousa
Revista de Biología Tropical , 2011,
Abstract: The African oil palm (Elaeis guineensis) is the most effective oil producer in tons per hectare. Nevertheless, its increasing cultivation in Latin America is harmed by the “lethal yellowing”. Genetic resistance to this anomaly can be found in the germplasm of American oil palm or caiaué (E. oleifera), a native species from the Amazon rainforest. However, the procedures adopted to induce seeds of E. guineensis to germination frequently result mild for interespecific hybrids. Embryo in vitro cultivation can be a viable option. This work was aimed initially to test liquid MS medium supplemented with different glucose or sucrose concentrations for the in vitro cultivation of zygotic embryos from E. guineensis x E. oleifera controlled pollinations. Additionally we investigated different compost mixtures to acclimatize the regenerated hybrid plantlets. Concentrations of 10, 20 and 30g/L of both sugars were tested on flasks containing five mature zygotic embryos, with 15 repetitions per treatment in a total of 450 explants. The number of embryos displaying shoots and radicles at least 2mm in length per experimental unit was evaluated during phase one of in vitro cultivation. Plantlets displaying shoots and radicles were transferred to phase two of in vitro cultivation and subsequently to acclimatization, under 70% shading with manual water supply. The experiments of acclimatization were conducted with 130 plantlets randomly distributed in pure horticultural compost, 3:1 or 1:1 compost:sand mixtures and each plantlet was defined as an experimental unit. Data were submitted to ANOVA, t test and analyzes of correlation (p≤0.05). Highest emergence rates were 97% for shoots and 73% for radicles, observed in MS medium supplemented with 20g/L (110mM) of glucose. This sugar in concentrations of 20 or 30g/L provided balanced shoot/root development, and this was considered one of the reasons for the higher frequency of plantlet establishment. The survival percentage was 55% after the first 43 days of acclimatization and by the fourth month, 66 plants developed simultaneously longer shoot and root systems in pure horticultural compost. in conclusion, radicle development was an impairment to plantlet establishment and was overcame under media with glucose above 110mM. Acclimatization could benefit from an extended period of in vitro development. Rev. Biol. Trop. 59 (3): 1081-1088. Epub 2011 September 01. Elaeis guineensis es el productor de aceite más eficaz en toneladas por hectárea, su cultivo, cada vez mayor en América Latina, se ha visto perjudicado por el “amarilleami
Use of AFLPS to distinguish landraces of pejibaye (Bactris gasipaes) in brazilian Amazonia
Clement Charles R.,Sousa Nelcimar Reis,Rodrigues Doriane Pican?o,Astolfi-Filho Spártaco
Scientia Agricola , 2002,
Abstract: Although the first inhabitants of western Amazonia domesticated pejibaye (Bactris gasipaes Kunth, Palmae) or peach palm for its fruits, today it is widely planted for its heart-of-palm. Like other domesticates, pejibaye presents a complex hierarchy of landraces developed before the conquest of the Americas. The existence of three landraces (Pará, Solim es, Putumayo) was proposed along the Amazonas and Solim es Rivers, Brazil, based on morphological characteristics. There are some questions remaining about the intermediate landrace being an artifact of the morphometric analysis. AFLPs were used to evaluate the relationships among samples of these putative landraces. DNA was extracted from 99 plants representing 13 populations maintained in the Pejibaye Germplasm Bank, Manaus, AM; six primer combinations generated 245 markers via PCR, which were scored in an ABI Prism 310 sequencer and analyzed with GeneScan Software; Jaccard similarities were estimated and a dendrogram was generated with UPGMA. Two groups of plants were observed in the dendrogram instead of three, and were similar at 0.795. Each group contained two subgroups, similar at 0.815. One group (n=41) contained 73% Pará landrace plants, with one subgroup (n=22) containing 91% Pará, and the other (n=19) containing 53% Pará. The other group (n=58) contained 53% Solim es and 40% Putumayo landrace plants, with one subgroup (n=21) containing 52% Solim es and 43% Putumayo, and the other (n=35) containing 57% Solim es and 37% Putumayo. The first group confirmed the Pará landrace. The second group suggested that the Solim es landrace does not exist, but that the Putumayo landrace extends along the Solim es River to Central Amazonia.
Divergência genética entre clones de guaranazeiro
Nascimento Filho, Firmino José do;Atroch, André Luiz;Sousa, Nelcimar Reis de;Garcia, Terezinha Batista;Cravo, Manoel da Silva;Coutinho, Enilton Fick;
Pesquisa Agropecuária Brasileira , 2001, DOI: 10.1590/S0100-204X2001000300014
Abstract: the multivariate techniques to estimate the genetic diversity of a group of progenitors has been used by plant breeders. the progenitors are still being used in parental or multiple crossings to form segregating populations that have larger probability of recovering superior genotypes. this work was carried out with the objective of identifying guarana clones with high production and divergent clones that can be used in a crossing program in order to obtain hybrids with heterosis, as well as materials for vegetative propagation. one hundred and forty-eight clones of guarana in use at this moment in the genetic breeding program of embrapa-centro de pesquisa agroflorestal da amaz?nia ocidental were studied. to estimate the genetic divergence, the cluster analysis was used in which the measure of dissimilarity used was the euclidian average standardized distance and the tocher's method of grouping and a single linkage method to make up a dendrogram between groups of clones. there was formation of seven divergent groups. it was concluded that the genetic divergence between the clones is not large because two groups with two clones and three groups with one clone have been formed. the cmu384 and cmu801 clones were the genetically closest and could be used to form a population with uniform vegetative development for use in commercial plantations.
Use of AFLPS to distinguish landraces of pejibaye (Bactris gasipaes) in brazilian Amazonia
Clement, Charles R.;Sousa, Nelcimar Reis;Rodrigues, Doriane Pican?o;Astolfi-Filho, Spártaco;Moreno, Yolanda Nú?ez;Pascual, Vicente Torres;Rodríguez, Francisco Javier Gallego;
Scientia Agricola , 2002, DOI: 10.1590/S0103-90162002000400019
Abstract: although the first inhabitants of western amazonia domesticated pejibaye (bactris gasipaes kunth, palmae) or peach palm for its fruits, today it is widely planted for its heart-of-palm. like other domesticates, pejibaye presents a complex hierarchy of landraces developed before the conquest of the americas. the existence of three landraces (pará, solim?es, putumayo) was proposed along the amazonas and solim?es rivers, brazil, based on morphological characteristics. there are some questions remaining about the intermediate landrace being an artifact of the morphometric analysis. aflps were used to evaluate the relationships among samples of these putative landraces. dna was extracted from 99 plants representing 13 populations maintained in the pejibaye germplasm bank, manaus, am; six primer combinations generated 245 markers via pcr, which were scored in an abi prism 310 sequencer and analyzed with genescan software; jaccard similarities were estimated and a dendrogram was generated with upgma. two groups of plants were observed in the dendrogram instead of three, and were similar at 0.795. each group contained two subgroups, similar at 0.815. one group (n=41) contained 73% pará landrace plants, with one subgroup (n=22) containing 91% pará, and the other (n=19) containing 53% pará. the other group (n=58) contained 53% solim?es and 40% putumayo landrace plants, with one subgroup (n=21) containing 52% solim?es and 43% putumayo, and the other (n=35) containing 57% solim?es and 37% putumayo. the first group confirmed the pará landrace. the second group suggested that the solim?es landrace does not exist, but that the putumayo landrace extends along the solim?es river to central amazonia.
In vitro rescue of interspecific embryos from Elaeis guineensis x E. oleifera (Arecaceae)
da Silva Angelo,Paula Cristina; Cardoso Moraes,LarissaAlexandra; Lopes,Ricardo; Reis Sousa,Nelcimar; Vieira da Cunha,Raimundo Nonato; Caetano Quisen,Regina;
Revista de Biología Tropical , 2011,
Abstract: the african oil palm (elaeis guineensis) is the most effective oil producer in tons per hectare. nevertheless, its increasing cultivation in latin america is harmed by the “lethal yellowing”. genetic resistance to this anomaly can be found in the germplasm of american oil palm or caiaué (e. oleifera), a native species from the amazon rainforest. however, the procedures adopted to induce seeds of e. guineensis to germination frequently result mild for interespecific hybrids. embryo in vitro cultivation can be a viable option. this work was aimed initially to test liquid ms medium supplemented with different glucose or sucrose concentrations for the in vitro cultivation of zygotic embryos from e. guineensis x e. oleifera controlled pollinations. additionally we investigated different compost mixtures to acclimatize the regenerated hybrid plantlets. concentrations of 10, 20 and 30g/l of both sugars were tested on flasks containing five mature zygotic embryos, with 15 repetitions per treatment in a total of 450 explants. the number of embryos displaying shoots and radicles at least 2mm in length per experimental unit was evaluated during phase one of in vitro cultivation. plantlets displaying shoots and radicles were transferred to phase two of in vitro cultivation and subsequently to acclimatization, under 70% shading with manual water supply. the experiments of acclimatization were conducted with 130 plantlets randomly distributed in pure horticultural compost, 3:1 or 1:1 compost:sand mixtures and each plantlet was defined as an experimental unit. data were submitted to anova, t test and analyzes of correlation (p≤0.05). highest emergence rates were 97% for shoots and 73% for radicles, observed in ms medium supplemented with 20g/l (110mm) of glucose. this sugar in concentrations of 20 or 30g/l provided balanced shoot/root development, and this was considered one of the reasons for the higher frequency of plantlet establishment. the survival percentage was 55% after th
Descri??o fonética eletropalatográfica de fones alveolares
Jesus, Marisa de Sousa Viana;Reis, Cesar;
Jornal da Sociedade Brasileira de Fonoaudiologia , 2012, DOI: 10.1590/S2179-64912012000300011
Abstract: purpose: to describe the articulation of the brazilian portuguese, by examining the tongue-palate contact in the production of consonantal phones. methods: the electropalatography (epg) of the alveolar consonants of the brazilian portuguese produced by an individual with typical speech was used, considering the alveolar, post-alveolar, palatal, and velar rates, as well as the percentage of activated contacts at the point of maximum constriction, and the visual inspection of palatograms. results: as expected, it was observed that all the examined phones have more contact in the alveolar region at the point of maximum constriction. the phones /t/, /d/ and /n/ showed more alveolar contact, with total obstruction of the air stream; the fricative phones /s/ and /z/ were characterized by the absence of contact at the central longitudinal axis; the lateral phone /l/ did not present contact at the lateral longitudinal axis, and the tap /?/ showed not only few tongue-palate contacts but it was also produced in the shortest duration time. conclusion: the electopalatography allowed a detailed description of the extension of the tongue-palate contact in the different alveolar phones of the brazilian portuguese and how they occur.
"O que o rei n?o viu": música popular e nacionalidade no Rio de Janeiro da Primeira República
Reis, Letícia Vidor de Sousa;
Estudos Afro-Asiáticos , 2003, DOI: 10.1590/S0101-546X2003000200003
Abstract: accompanying the legitimization process of the carioca samba during the first three decades of the 20th century, the author investigates how this rhythm gradually has gone from black ghettos to a national sphere. such process was conflicting and ambiguous for being attached to brazil's social recognition of black people. therefore, if the rhythm was the same, its meaning and usage were diverse. the elites' esthetic sensitivity split during the period of time that referred to tath popular music, which has provoked an oscillation between recognition and rejection. this double perspective is related to one of the intellectuals' and governors' great dilemmas concerning the constitution of a political body in the first republic. if, on one hand, the social darwinist criteria were obstacles preventing the incorporation of black people in the public sphere, on the other, the black cultural traditions - set aside as a sign of "decadence" - had already become a national exponent. finally, it is investigated how this dilemma showed no results in attempting to create a popular symbolization during the first republic towards its political legitimacy.
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