Quantitative Analysis of 2,4-Dichlorophenoxyacetic Acid in Water Samples by Two Immunosensing Methods

1996 ◽  
Vol 44 (1) ◽  
pp. 343-350 ◽  
Author(s):  
Christine Wittmann ◽  
Frank F. Bier ◽  
Sergei A. Eremin ◽  
Rolf D. Schmid
Keyword(s):  
Quantitative Analysis ◽  
Water Samples ◽  
Dichlorophenoxyacetic Acid ◽  
2,4 Dichlorophenoxyacetic Acid

scholarly journals METODOLOGIA ANALÍTICA DE RESÍDUO DO HERBICIDA 2,4-D (ÁCIDO 2,4-DICLOROFENOXIACÉTICO) EM AMOSTRAS DE ÁGUA EM ÁREA DE CULTIVO DE CANA-DE-AÇÚCAR

2002 ◽  
Vol 12 ◽  
Author(s):  
ANTONIO LUIZ CERDEIRA ◽  
MARIA CONCEIÇÃO PERES YOUNG PESSOA ◽  
PIERINA SUELI BONATO ◽  
REGINA HELENA COSTA QUEIROZ ◽  
VERA LUCIA LANCHOTE
Keyword(s):  
Gas Chromatography ◽  
Sugar Cane ◽  
Water Samples ◽  
Dichlorophenoxyacetic Acid ◽  
Layered Soils ◽  
Analytical Methodology ◽  
Herbicide Concentration ◽  
Second Year ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
Systems Simulation

Desenvolveu-se método de análise de resíduo do herbicida 2,4-D para amostras de água coletadas na microbacia do Córrego do Espraiado no período de 1996 a 1999. A avaliação da tendência do produto alcançar camadas mais profundas do solo foi efetuada por simulação de sistemas (CMLS-94-“Chemical Movement in Layered Soils”) para melhor entendimento do comportamento do herbicida. O método analítico, utilizando cromatografia a gás, permitiu correlação de 99,9% entre a área dos picos e a concentração existente, indicando alta eficiência. Não foi encontrado resíduo de 2,4-D na água coletada nos anos de 1996 a 1999, o que também reforça os dados encontrados por simulação. Esses indicaram que 60 cm foi a profundidade máxima atingida no período de três anos, tanto para o Latossolo Roxo quanto para o Latossolo Vermelho Escuro. O mesmo estudo evidenciou que a partir do segundo ano após a aplicação já não havia mais resíduos do produto em ambos os solos estudados. ANALYTICAL METHODOLOGY OF 2,4-D (2,4-DICHLOROPHENOXYACETIC ACID) HERBICIDE RESIDUES IN SAMPLES OF WATER IN A SUGAR-CANE CULTIVATION AREA IN BRAZIL Abstract A method of analysis of the herbicide 2,4-D was developed for water samples collected in the Espraiado watershed in the period of 1996 and 1999. The evaluation of the tendency of the product to reach deeper layers of the soil was made by systems simulation (CMLS-94-“Chemical Movement in Layered Soils”) for better understanding of the herbicide behavior. The gas chromatography analytical method resulted in a 99.9% correlation of the peaks area in the graphics and the herbicide concentration, and indicated that it was highly effective. No residue of 2,4-D was detected in water in the years of 1996 to 1999, which also reinforce the data obtained by simulation. This indicated the leaching down to 60 cm., reached in a three-year period, in both types of soils, “Latossolo Roxo” and “Latossolo Vermelho-Escuro” The same study evidenced that from the second year after application there were no more product residues in both types of the soils studied.

In Vitro Shoot Regeneration from Callus Derived from Marubakaido Apple Rootstock under Different Aluminium Concentrations

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 460e-460 ◽  
Author(s):  
Marisa F. de Oliveira ◽  
Gerson R. de L. Fortes ◽  
João B. da Silva
Keyword(s):  
Shoot Regeneration ◽  
Dichlorophenoxyacetic Acid ◽  
Apple Rootstock ◽  
Under Five ◽  
Significant Difference ◽  
Previously Treated ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
In Vitro Shoot Regeneration

The aim of this work was to evaluate the organogenesis of Marubakaido apple rootstock under different aluminium concentratons. The explants were calli derived from apple internodes treated with either 2,4-dichlorophenoxyacetic acid or pichloram at 0.5 and 1.0 μM and under five different aluminium concentrations (0, 5, 10, 15, 20 mg/L). These calli were then treated with aluminium at 0, 5, 10, 15, and 20 mg/L. It was observed shoot regeneration only for those calli previously treated with pichloram. There were no significant difference among the aluminium concentrations.

Characterization of the Reproductive Mode in Guayule In Vitro

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 483a-483
Author(s):  
Roy N. Keys ◽  
Dennis T. Ray ◽  
David A. Dierig
Keyword(s):  
Field Experiments ◽  
Reproductive Mode ◽  
Dichlorophenoxyacetic Acid ◽  
Initial Field ◽  
Breeding Lines ◽  
Reproductive Modes ◽  
Desert Southwest ◽  
2,4 Dichlorophenoxyacetic Acid

Guayule (Parthenium argentatum Gray, Asteraceae) is a latex-producing perennial desert shrub that is potentially of economic importance as an industrial crop for the desert Southwest. It is known to possess complex reproductive modes. Diploids are predominantly sexual and self-incompatible, while polyploids show a range of apomictic potential and self-compatibility. This paper describes the development of a relatively rapid and simple technique for characterizing reproductive modes of breeding lines of P. argentatum. Initial field experiments were based on an auxin test used successfully to characterize reproductive mode in the Poaceae. The application of 2,4-dichlorophenoxyacetic acid inhibited embryo formation in P. argentatum, but this was not the case with other auxins tested. Results of field experiments were ambiguous because: 1) the floral structure of P. argentatum is such that auxins might not have penetrated to the ovules, and 2) there was potential self-fertilization by pollen released within isolation bags. Therefore, in vitro culture of flower heads was tested because it provided much better control of environmental conditions, growth regulator application, and pollen release. Auxin alone, or in combination with gibberellic acid or kinetin, inhibited parthenogenesis in vitro. Embryo production did not vary using two substantially different nutrient media. In vitro flower head culture using a (Nitsch and Nitsch) liquid nutrient medium without growth regulators, enabled characterization of the reproductive mode of seven breeding lines, ranging from predominantly sexual to predominantly apomictic. The results of this technique were substantiated using RAPD analyzes of progeny arrays from controlled crosses.

The role of a metabolic intermediate in the biodegradation of inhibitory substrates

1997 ◽  
Vol 36 (10) ◽  
pp. 27-36 ◽  
Author(s):  
P. Mungkarndee ◽  
S. M. Rao Bhamidimarri ◽  
A. J. Mawson ◽  
R. Chong
Keyword(s):  
The Other ◽  
Metabolic Product ◽  
Dichlorophenoxyacetic Acid ◽  
Mutual Inhibition ◽  
Metabolic Intermediate ◽  
Batch Cultures ◽  
Ortho Cresol ◽  
2,4 Dichlorophenoxyacetic Acid

Biodegradation of the mixed inhibitory substrates, 2,4-dichlorophenoxyacetic acid (2,4-D) and para-chloro-ortho-cresol (PCOC) was studied in aerobic batch cultures. Each substrate added beyond certain concentrations inhibited the degradation of the other. This mutual inhibition was found to be enhanced by 2,4-dichlorophenol (2,4-DCP) which is an intermediate metabolic product of 2,4-D. When 2,4-DCP accumulated to approximatelY 40 mg/l degradation of all compounds in the mixed 2,4-D and PCOC substrate system was completely inhibited. The degradation of 2,4-D and PCOC individually was also found to be inhibited by elevated concentrations of 2,4-DCP added externally, while PCOC inhibited the utilization of the intermediate.

2,4-dichlorophenoxyacetic acid through lactation induces astrogliosis in rat brain

1997 ◽  
Vol 30 (3) ◽  
pp. 175-185 ◽  
Author(s):  
A. Brusco ◽  
J. Pecci Saavedra ◽  
G. García ◽  
P. Tagliaferro ◽  
A. M. Evangelista de Duffard ◽  
...  
Keyword(s):  
Rat Brain ◽  
Dichlorophenoxyacetic Acid ◽  
2,4 Dichlorophenoxyacetic Acid
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