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Registros recuperados: 11
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Acute Toxicity of Herbicides and Sensibility of Aquatic Plant Wolffia brasiliensis as a Bioindicator Organism Planta Daninha
PEREIRA,P.C.; BRUNETTI,I.A.; CASTRO,K.S.; CHIAROTTI,L.F.; SANTOS,B.E.; MORAES,J.C.; CRUZ,C..
ABSTRACT: This study aimed to establish the mass cultivation of Wolffia brasiliensis under laboratory conditions, determine the sensitivity of reference substances (potassium dichromate, sodium chloride, and potassium chloride), and estimate the acute toxicity (LC50;7d) for the herbicide glyphosate, diquat, paraquat, imazapyr, 2,4-D, saflufenacil, imazamox, penoxsulam, metsulfuron-methyl, and atrazine. Three media were tested for culture establishment: Hoagland’s medium, 5.0 g L-1 NPK fertilizer (20-5-20), a mixture of Oxisol + organic substrate of decaying aquatic plant (2:1; v v-1). Sensitivity tests with reference substances and acute toxicity for herbicides were carried out after establishing the cultivation. The species W. brasiliensis presented an...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Macrophytes; Chemicals; Ecotoxicology; Reference substances; Pesticides.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100289
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COMMERCIAL SWEETPOTATO PRODUCTION IN MISSISSIPPI AgEcon
Parvin, David W., Jr.; Walden, Charles; Graves, Benny.
This report provides an estimate of selected costs incurred in sweetpotato production in Mississippi, 1999. Land, management and general farm overhead costs were not included. Per acre returns above specified costs are estimated at approximately $1,100.00 per acre.
Tipo: Working or Discussion Paper Palavras-chave: Sweetpotatoes; Production costs; Net returns; Cash flow; Price sensitivity; Equipment; Chemicals; Production Economics.
Ano: 1999 URL: http://purl.umn.edu/15785
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EFFECTS OF FIRM-SPECIFIC FACTORS ON R&D EXPENDITURES OF AGRIBUSINESS COMPANIES AgEcon
Roucan-Kane, Maud; Ubilava, David; Xu, Pei.
The objective of this paper is to determine how the firm's infrastructure, the financial characteristics of a company (net income, sales), and the organizational structure (number of acquisitions, age of establishment of the firm) affect R&D investments in the agricultural sector. We use data for companies under the SIC codes for agricultural chemicals, and crop planning and protection. The results based on analysis of 69 observations of 12 firms revealed that firm's financial and organizational infrastructure does affect its R&D expenditures. Older and larger firms tend to spend more on R&D. During the last 17 years the R&D expenditures with respect to the sales of the company have been reduced. Finally, contrary to the expectations,...
Tipo: Working or Discussion Paper Palavras-chave: R&D; Agriculture; Chemicals; Crop planning; Crop protection; Agribusiness; Agribusiness; Research and Development/Tech Change/Emerging Technologies; A10; O32; Q16.
Ano: 2007 URL: http://purl.umn.edu/7332
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Energy and Chemicals from Native Grasses: Production, Transportation and Processing Technologies Considered in the Northern Great Plains AgEcon
Tiffany, Douglas G.; Jordan, Brendan; Dietrich, Erin; Vargo-Daggett, Becca.
Production of biomass from native prairie species offers the opportunity to produce energy and chemicals while providing substantial ecological services in the Northern Great Plains. This paper analyzes the application of rapid pyrolysis to produce bio-oil, which has the potential for use as a low-grade fuel oil or as a source for extraction of valuable chemicals. Yields of bio-oil, the quantities of extractable chemicals, and chemical prices drive the economics of this concept, which has a more extensive track record utilizing wood chips. A spreadsheet model was developed to determine gross margins available to defray costs to extract and refine such chemical products as hydroxyacetaldehyde, phenol, formic acid, acetic acid and various resins....
Tipo: Working or Discussion Paper Palavras-chave: Prairie grasses; Pyrolysis; Economics; Chemicals; Energy; Bio-oil; Resource /Energy Economics and Policy.
Ano: 2006 URL: http://purl.umn.edu/13838
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Etude du comportement à court terme de produits chimiques flottants après leur déversement en mer et recherche d'un indicateur d'exposition biologique ArchiMer
Mamaca, Emina.
Large volumes of chemicals are produced each year. Shipment of these chemicals by boats and barge transiting along coastal marine route are numerous. Recent examples of chemical spills as Eiwa Maru (2002) sinking with 5000 T of xylène from 20 nm of Tokyo and less far from our coastline the Ievoli Sun (2000) which sank and release 1000 T of styren has raised concern about the general lack of information of the fate of chemicals at sea and the impact on fauna and flora. The goal of this study is to characterize the behaviour of some selected chemicals at sea in order to evaluate the cinetic of natural dispersion, emulsification and evaporation. This study is done in three scale : in laboratory with a new methodologie created for this purpose, in a pilot...
Tipo: Text Palavras-chave: NRRT; Biomarker; Field trial; Emulsification; Natural dispersion; Vegetable oil; Chemicals; NRRT; Biomarqueur; Experimentation en mer; Émulsification; Dispersion naturelle; Huiles végétales; Produits chimiques.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/these-2460.pdf
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L'écotoxicologie appliquée au milieu marin ArchiMer
Maurice, Manuelle.
In this report we present the main scientific orientations taken until now in France and under the world conceming marine ecotoxicology. We discuss successively the state of the environment in France, the toxicity of pollutants on marine organisms, the monitoring of pollutants and the technics used to measure the biological effects on marine ecosystems.
Tipo: Text Palavras-chave: Ecotoxicologie marine; Écosystèmes; Effets biologiques; Bio-surveillance; Polluants chimiques; Marine ecotoxicology; Chemicals; Ecosystems; Biological effects; Bio-monitoring.
Ano: 1996 URL: http://archimer.ifremer.fr/doc/00123/23412/21239.pdf
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Les pollutions marines accidentelles. Au-delà du pétrole brut, les produits chimiques et autres déversements en mer ArchiMer
Marchand, Michel.
At every new marine pollution the same interrogations : to take action and in which way? What could be the consequences? At first, to know the behaviour of pollutants, hydrocarbon or chemicals. But the improvement of knowledges or expert appraisement will not be sufficient with regards to a liberal logic which is not interested in maritime safety.
Tipo: Text Palavras-chave: Inervention; Chemicals; Petroleum; Accidental pollution; Marine pollution; Produit chimique; Hydrocarbure; Petrole brut; Pollution accidentelle; Pollution marine.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/publication-1008.pdf
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Manejo de recursos en la agricultura campesina: producción de maíz en el municipio de San José Chiapa, Puebla. Colegio de Postgraduados
Turiján Altamirano, Teresa.
El maíz es uno de los principales cultivos en el municipio de San José Chiapa, Puebla, su producción puede variar de acuerdo al contexto edafoclimático, social y económico en donde se desarrolle, así como por los recursos empleados en su manejo, principalmente el tipo de tecnologías, uso de agroquímicos, y los recursos aportados por la ganadería familiar. La presente investigación tuvo como objetivos reconocer los tipos de tecnologías que predominan en el manejo del maíz y cómo influyen en la productividad del cultivo; conocer el uso de agroquímicos utilizados por los productores y hacer una comparación con las recomendaciones del paquete tecnológico del INIFAP; de igual manera reconocer la relación que existe entre el manejo y la ganadería familiar. Para...
Palavras-chave: Tecnologías campesinas; Tecnologías modernas; Manejo del cultivo; Agroquímicos; Ganadería familiar; Peasant technologies; Modern technologies; Crop management; Chemicals; Familiar livestock; Maestría; EDAR; Estrategias para el Desarrollo Agrícola Regional.
Ano: 2010 URL: http://hdl.handle.net/10521/369
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Marine litter, future prospects for research ArchiMer
Galgani, Francois.
As far back as 1870, i.e., about 150 years ago, Jules Verne described the accumulation of debris in the convergence zone of the North Atlantic Ocean in his famous novel entitled “Twenty Thousand Leagues under the Sea.” Many scientific reports have addressed this topic since and our main concern today is the ever increasing volume of marine litter invading the oceans in various and complex ways. One of the current main challenges is assessing the final destination of this litter. To date, its adverse effects on marine life have only occasionally been investigated and many questions remain unanswered. In addition to efforts to monitor and reduce litter, recent literature has underlined the scientific community's focus on specific issues such as (i) the...
Tipo: Text Palavras-chave: Marine litter; Microplastics; Marine debris; Trophic chains; Chemicals; Rafting.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00358/46933/46837.pdf
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Método multigeração para avaliação dos efeitos de poluentes sobre a reprodução de caramujos de água doce. Infoteca-e
OLIVEIRA FILHO, E. C.; GERALDINO, B. R.; GRISOLIA, C. K.; PAUMGARTTEN, F. J. R..
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E) Palavras-chave: Toxicologia; Caramujo; Biomphalaria tenagophila; Organismo aquático; Produto químico; Endosulfan; Toxicidade; Toxicology; Aquatic organisms; Chemicals; Toxicity.
URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/568342
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Potencial de impacto da agricultura sobre os recursos hídricos na região do cerrado. Infoteca-e
OLIVEIRA-FILHO, E. C. de; LIMA, J. E. F. W..
2002
Tipo: Documentos (INFOTECA-E) Palavras-chave: Cerrado; Recurso hídrico; Contaminação; Qualidade da água; Produto químico; Agrotóxico; Fertilizante; Poluição da água; Impacto ambiental; Toxicologia; Water resources; Contamination; Water quality; Chemicals; Agricultural chemicals; Fertilizers; Water pollution; Environmental impact; Toxicology.
Ano: 2002 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/567742
Registros recuperados: 11
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