Consulta: creatorFacets:"Almeida,S.D.B."
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Data/hora: 13/06/2024 20:34:15

Sorption and desorption of Suflafenacil in two soils in the state of São Paulo with different physical and chemical attributes
Provedor de dados: 87
Autores: Matallo,M.B.; Franco,D.A.S.; Almeida,S.D.B.; Cerdeira,A.L.
A study was conducted to evaluate the sorption and desorption of 14C herbicide saflufenacil (pyrimidinedione) in two soils in the State of São Paulo, classified as Red Yellow Latosol with clayey texture (LVA-1) and medium texture (LVA-2), using the batch method through isotherms. The soils were air dried and sieved a 2 mm mesh. The radioactivity was determined by liquid scintillation spectrometry in acclimatized room (25 ± 2 °C). Sorption isotherms were conducted for 5 concentrations of saflufenacil (5.0; 2.5; 1.0; 0.5 and 0.05 μg mL-1) and the results were adjusted to the Freundlich equation, thus obtaining the parameters of sorption followed by two extractions with 0.01 M CaCl2 to determine desorption parameters similarly to sorption. The results showed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Isotherms; Hysteresis; Herbicides.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000200017

Avaliação do uso de glyphosate em soja geneticamente modificada e sua relação com o ácido chiquímico
Provedor de dados: 87
Autores: Franco,D.A.S.; Almeida,S.D.B.; Cerdeira,A.L.; Duke,S.O.; Moraes,R.M.; Lacerda,A.L.S.; Matallo,M.B.
Com o aumento da comercialização de culturas geneticamente modificadas (GM) resistentes ao glyphosate, é importante investigar a relação entre o uso desse herbicida e seus efeitos no crescimento e desenvolvimento de plantas de soja GM, assim como sua relação com o ácido chiquímico. Nesse sentido, foi conduzido um ensaio de campo e outro em casa de vegetação, com o objetivo de verificar a influência do glyphosate no crescimento, no desenvolvimento e na qualidade dos grãos da soja GM, bem como sua exsudação radicular e posterior absorção por plântulas de soja convencional cultivada sob condições hidropônicas. O ensaio de campo foi realizado em Eng. Coelho-SP, em 2007/08, sob delineamento de blocos ao acaso com quatro repetições, com aplicações isoladas (720...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chiquimato; Transgenia; Exsudação radicular; AMPA; Hidroponia.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582012000300023

Glyphosate influence on the physiological parameters of Conyza bonariensis biotypes
Provedor de dados: 87
Autores: Vargas,L.; Silva,D.R.O.; Agostinetto,D.; Matallo,M.B.; Santos,F.M.; Almeida,S.D.B.; Chavarria,G.; Silva,D.F.P.
The objective of this study was to determine changes in gas exchange and inhibition of EPSPs, based on the accumulation of shikimic acid in horseweed biotypes resistant and sensitive to glyphosate. Two experiments were conducted in a factorial model. The first one evaluated horseweed biotypes (one resistant and one susceptible to glyphosate), and herbicide rates (0 and 1,080 g a.e. ha ¹) applied on the weed. In the second experiment, the horseweed biotypes (susceptible and resistant to glyphosate) were evaluated in five periods as following: 0, 3, 7, 10, and 14 days after herbicide application (DAH). The photosynthetic rate, transpiration, carboxylation efficiency, and water efficiency were determined using an infrared gas analyzer (IRGA), and shikimic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hairy fleabane; Resistance; Photosynthesis; EPSPs; Shikimic acid.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000100017

Glyphosate as a tool to produce shikimic acid in plants
Provedor de dados: 87
Autores: Matallo,M.B.; Almeida,S.D.B.; Franco,D.A.S.; Cerdeira,A.L.; Gazzeiro,D.L.P.
Oseltamivir phosphate is a potent viral inhibitor produced from shikimic acid extracted from seeds of Ilicium verum, the most important natural source. With the site of action 5-enolpyruvylshikimate-3-phosphate synthase (EPSP), glyphosate is the only compound capable of inhibiting its activity with the consequent accumulation of shikimic acid in plants. Corn and soybean plants were sprayed with reduced rates of glyphosate (0.0 to 230.4 g a.i. ha¹) and shikimic acid content in the dry mass was determined by HPLC 3, 7 and 10 days after application. Results showed shikimic acid accumulation in dry mass with increases of up to 969% in corn and 33,000% on soybeans, with peak concentrations 3 days after treatment (DAT). Industrial feasibility for shikimic acid...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Herbicides; Corn; Soybean; Oseltamivir; Pandemics; HPLC.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000300016