Plant Persistence
Mostrando 13-24 de 63 artigos, teses e dissertações.
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13. Padrões de coocorrência de espécies vegetais de cerrado em diferentes regimes de fogo
Fire plays an important role in determining the structure of cerrado. Annual and biennial fires favor herbaceous species and constrain woody species. As a consequence, frequent burnings are expected to change the pattern of cooccurrence of plant species. We tested (1) whether high fire frequencies increase the number of occurrences of herbaceous and shrubby
Publicado em: 2010
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14. Avaliação da estrutura genética do surubim, Pseudoplatystoma corruscans (Actinopterygii: Siluriformes) como subsídio para o repovoamento do submédio São Francisco
The São Francisco River is 2700 km long, draining areas of the States of Minas Gerais, Goias, Bahia, Pernambuco, Alagoas, and Sergipe, as well as part of the Federal District. Before the construction of Paulo Afonso Hydroeletric Power Plant, waterfalls of Paulo Afonso (north-eastern Brazil) and its respective lakes already constituted a natural obstacle to
Publicado em: 2010
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15. RESIDUALS FROM TWO HERBICIDES IMAZETHAPYR AND IMAZAPIC ON PADDY RICE WITH DIFFERENTS SOIL MANAGEMENTS / RESIDUAL DA MISTURA FORMULADA DOS HERBICIDAS IMAZETHAPYR E IMAZAPIC EM ÁREAS DE ARROZ SOB DIFERENTES MANEJOS DE SOLO
Red rice (Oryza spp.) is one of the main limiting factors of rice yield (O. sativa L.) in the world and particularly in the Rio Grande do Sul (RS) state Brazil. The Clearfield technology is a viable and efficient tool for controlling such harmful plant by using imidazolinone herbicides in tolerant cultivars. However, herbicides may persist on the soil after
Publicado em: 2008
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16. BIOATIVIDADE DE EXTRATOS VEGETAIS NO CONTROLE DE Sitophilus oryzae (LINNÉ, 1763) EM ARROZ / BIOACTIVITY OF VEGETABLE EXTRACTS ON THE CONTROL OF Sitophilus oryzae (LINNÉ, 1763) IN RICE
The continuous growth of the world population, intensive competition among humans and plant pests for the same food sources, the resistence to existing inseticides by some insects and the persistence of residues in the environment and food created the necessity for new insecticides. In this research field, vegetable species appear as a promising source of ne
Publicado em: 2007
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17. Avaliação do uso terapêutico do extrato de Lafoensia pacari St. Hil. Mangava-Brava na erradicação do Helicobacter pylori: Ensaio Clínico Randomizado Duplo Cego/Valfredo da Mota Menezes.- / Assessing the therapeutic use of Lafoensia pacari St. Hil. extract (Mangava brava) in the eradication of Helicobacter pylori: Double-blind randomized clinical trial.
Background: The eradication of Helicobacter pylori is easily achieved by combining antisecretory agents and antibiotics; however, the cost of these associations is very high for the population of Third World countries, where the prevalence of the infection is even higher and leads to markedly reduced treatment effectiveness. We tested a plant (Lafoensia paca
Publicado em: 2006
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18. IMIDAZOLINONE TOLERANT RICE: RED RICE CONTROL, HERBICIDE PERSISTENCE AND OUTCROSSING / ARROZ TOLERANTE A IMIDAZOLINONAS: CONTROLE DO ARROZ VERMELHO, PERSISTÊNCIA DE HERBICIDAS E FLUXO GÊNICO
Red rice (Oryza spp.) is one of the main limiting factors to rice (O. sativa L.) yield. After several decades searching for red rice control tools, it was developed imidazolinone tolerant rice, to selectively control red rice. To better understand this technology it were conducted two experiments in 2004/05, in Santa Maria, Rio Grande do Sul state, Brazil. T
Publicado em: 2006
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19. Morphogenesis, tillering and herbage accumulation dynamics in marandu grass swards under continuous stocking. / Morfogênese, dinâmica do perfilhamento e do acúmulo de forragem em pastos de capim-marandu sob lotação contínua.
Brazil is a unique environment for developing efficient and sustainable pastoral systems of animal production. Advances in this area have been modest however, resulting in slow progress and revealing deficiencies of the current conceptual basis used for interpreting results from research, particularly those related to the dynamic and systemic characteristic
Publicado em: 2004
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20. Ecologia de populações de Lytocaryum hoehnei (Burret) Toledo (Arecaceae) na Reserva Florestal do Morro Grande, Cotia, SP
The present study has investigated aspects of the natural history and ecology of palm Lytocaryum hoehnei. The palms were accompanied in three sites at the Reserva Florestal do Morro Grande, Cotia, SP, approximately 4 km apart from each other, during 2000, 2001, and 2002. Four ontogenetic stages were identified: 1) seedling: individuals with entire leaves, 2)
Publicado em: 2004
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21. Biological persistence of ametryn diuron and oxyfluoren in two soils under greenhouse conditions. / PersistÃncia biolÃgica de ametryn, diuron e oxyfluorfen em dois tipos de solos sob condiÃÃes de casa de vegetaÃÃo
This research had the objective of evaluating the biological persistence of three pre-emergence herbicides in two soil types under greenhouse conditions. Oat plants were used as organism test. Two experiments were established: Experiment 1 in the Agronomy Department at Lavras Federal University, Lavras, MG, Brazil, from may to june/2002, and Experiment 2 in
Publicado em: 2003
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22. Detecção e caracterização da resistência de Brevipalpus phoenicis (Geijskes, 1939) (Acari: Tenuipalpidae) ao acaricida propargite. / Detection and characterization of Brevipalpus phoenicis (Geijskes, 1939) (Acari: Tenuipalpidae) resistance to the acaricide propargite.
The citrus flat mite Brevipalpus phoenicis (Geijskes) is one of the most important citrus pests because it vectors the citrus leprosis virus. The acaricide propargite has been frequently used to control this mite. Therefore, the objective of this work was to collect basic information for implementing a resistance management program of B. phoenicis to proparg
Publicado em: 2003
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23. Metabolism of 2,4-Dichlorophenoxyacetic Acid. III. Metabolism and Persistence in Dormant Plant Tissue. 1
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24. Cancer of the respiratory tract in nickel sinter plant workers: effect of removal from sinter plant exposure.
The risk of death due to cancer of the nose or lung was studied in nickel sinter plant workers during the period after they left the sintering operations. It was found that the excess risk of death from both diseases continued for many years after leaving the sinter plant. No effect of age at first exposure could be found. Possible explanations for the conti