Urea Herbicides
Mostrando 1-12 de 18 artigos, teses e dissertações.
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1. Estudo das alteraÃÃes hematolÃgicas, bioquÃmicas e genotÃxicas induzidas por agrotÃxicos em agricultores do estado do Piauà / STUDY OF POSSIBLE GENETIC CHANGES INDUCED BY PESTICIDES IN FARMERS IN THE STATE OF PIAUÃ
Exposure to pesticides represents a potential risk to human health. In addition to poisoning, these compounds may interact with DNA, causing degenerative diseases, including cancer. The risk assessment for pesticides was conducted in the municipalities of Picos, Piripiri, Barras and Josà de Freitas with farm workers (exposed group) and 55 administrative off
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/09/2011
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2. Degradacao do diuron-14C em solo e em plantas de cana-de-acucar (Saccharum spp.).
Plantas de cana-de-acucar cultivadas em lisimetros com solos Areno-Argiloso e Argiloso tratados com diuron-C absorveram e translocaram o diuron a partir de tres semanas apos a germinacao. O maximo de absorcao foi detectado nas amostras, quatro semanas apos a germinacao. A combustao de folhas de cana detectou maior absorcao pelas plantas situadas no solo Aren
Pesquisa Agropecuaria Brasileira. Publicado em: 2011
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3. EFICIÊNCIA DA MANIPUEIRA COMO QUELATIZANTE DE ZINCO E SEU EFEITO NA NUTRIÇÃO MINERAL DO FEIJOEIRO (PHASEOLUS VULGARIS L.) / THE EFFICIENCY OF MANIPUEIRA AS A ZINC CHELATE, AND ITS EFFECT ON ROOT GROWTH AND MINERAL NUTRITION IN BEAN CULTIVATION.
Cassava (Manihot esculenta, Crantz) is considered a vital agricultural crop due to its role as a staple food for low-income populations, primarily in the North and Northeast of Brazil, and is used as raw material for the manufacturing of a number of products such as flour and starch. During the manufacturing of these products, a potentially toxic liquid resi
Publicado em: 2010
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4. Weed desiccation with the herbicide glyphosate associated to nitrogen fertilizers / Dessecação de plantas daninhas com o herbicida glyphosate associado a fertilizantes nitrogenados
A expansão dos sistemas conservacionistas de manejo do solo e das culturas geneticamente modificadas para tolerância a herbicidas contribuiu sobremaneira para a crescente adoção do herbicida glyphosate que, atualmente, pode ser considerado o herbicida de maior importância mundial. Na tentativa de elevar a eficácia deste herbicida, diversas substâncias
Publicado em: 2009
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5. Fertilization and dynamics of weeds under corn organic no- tillage system / Adubação e dinâmica de plantas daninhas em sistema de plantio direto orgânico de milho
The objective of this work was to evaluate and compare weed population establishment, foliar nutrient contents and corn production under conventional and organic no-tillage systems. The experiment was conducted in 2004/2005 and 2005/2006 at the Experimental Station of Coimbra, MG, owned by Universidade Federal de Viçosa, UFV. The treatments were constituted
Publicado em: 2007
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6. AvaliaÃÃo do impacto do uso de agrotÃxicos nos trabalhadores rurais dos MunicÃpios de Ribeiro GonÃalves, Baixa Grande do Ribeiro e UruÃuà â Piauà / Evaluation of the Impact of the use of Pesticides on Agricultural Laborersâ Health in the Cities of UruÃuÃ, Ribeiro GonÃalves and Baixa Grande do Ribeiro
The pesticides are some of the main risky factors for agricultural laborersâ health. In the state of PiauÃ, the agricultural expansion which was implemented in the cerrados through the growth of the soy crops in the 90âs was a relevant factor that increased the use of pesticides. The unbalanced usage of pesticides is often related to acute and chronic poi
Publicado em: 2007
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7. Desempenho da cultura de milho (Zea mays L.) submetida a aplicação de herbicidas pós-emergentes, em diferentes situações de manejo. / Performance of the corn crop (Zea mays L.) submitted to application of post-emergence herbicides, in different management situations.
The application of post-emergence herbicides at corn crop is intense, exposing the crop to countless management situations in coincidence with the using of these agrochemicals that can result in damaging interactions to the crop. Therefore, this research was developed, with the objective of evaluating the possibility of interaction between these herbicides w
Publicado em: 2005
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8. "Tolerância de espécies de capim-colchão (Digitaria spp) a herbicidas na cultura de cana-de-açucar" / Tolerance of the crabgrass species (Digitaria spp) to herbicides in the sugarcane crop
It is known that the repetitive and successive use of the same or differents herbicides, but with same mechanism of action, impose a selection pressure on the weed population controled. The two main forms of weed population response resulted from the selection pressure of the herbicide is, weed species shifts, through selection of the tolerant species of wee
Publicado em: 2004
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9. The Mechanism of Herbicide Resistance in Tobacco Cells with a New Mutation in the QB Protein 1
A new mutant of the psbA gene conferring resistance to 2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine (atrazine) was obtained by selection of photomixotrophic tobacco (Nicotiana tabacum cv Samsun NN) cells. The 264th codon AGT (serine) in the wild psbA gene was changed to ACT (threonine) in these mutant tobacco cells. All other higher plants resistant
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10. Effect of Phenylurea Herbicides on Soil Microbial Communities Estimated by Analysis of 16S rRNA Gene Fingerprints and Community-Level Physiological Profiles
The effect of three phenyl urea herbicides (diuron, linuron, and chlorotoluron) on soil microbial communities was studied by using soil samples with a 10-year history of treatment. Denaturing gradient gel electrophoresis (DGGE) was used for the analysis of 16S rRNA genes (16S rDNA). The degree of similarity between the 16S rDNA profiles of the communities wa
American Society for Microbiology.
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11. Enrichment and Molecular Characterization of a Bacterial Culture That Degrades Methoxy-Methyl Urea Herbicides and Their Aniline Derivatives
Soil treated with linuron for more than 10 years showed high biodegradation activity towards methoxy-methyl urea herbicides. Untreated control soil samples taken from the same location did not express any linuron degradation activity, even after 40 days of incubation. Hence, the occurrence in the field of a microbiota having the capacity to degrade a specifi
American Society for Microbiology.
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12. Degradation of Urea Herbicides by Cell-Free Extracts of Bacillus sphaericus
N′-methoxy phenylurea herbicides are degraded by induced cells of Bacillus sphaericus ATCC 12123 by liberating carbon dioxide from the ureido portion of the molecule and leaving the corresponding aniline moieties. Cell-free extracts of B. sphaericus inactivate these herbicides in the same way as reported for whole cells. A 6.6-fold purification of the crud