Results 311 to 320 of about 105,475 (327)

Electroanalytical Determination of the Herbicide Atrazine in Natural Waters

International Journal of Environmental Analytical Chemistry, 1996
Abstract Differential pulse voltammetry at the static mercury drop electrode was used to establish an electroanalytical procedure for atrazine determinations in pure and natural waters. The cathodic peaks observed are attributed to the reduction of mono and di-protonated species and showed to be pH-dependent, with the maximum peak current values at pH ...
Luís Alberto Avaca, S A S Machado, Luiz Henrique Mazo, Silvio Crestana, Carlos Manoel Pedro Vaz   +4 more
openaire   +2 more sources

Photodegradation of Triazine Herbicides in Aqueous Solutions and Natural Waters

Journal of Agricultural and Food Chemistry, 2002
The photodegradation of three triazines, atrazine, simazine, and prometryn, in aqueous solutions and natural waters using UV radiation (lambda > 290 nm) has been studied. Experimental results showed that the dark reactions were negligible. The rate of photodecomposition in aqueous solutions depends on the nature of the triazines and follows first-order
Eleni Evgenidou, Konstantinos Fytianos
openaire   +3 more sources

The Importance of Herbicides for Natural Resource Conservation in the USA

2014
Early American agriculture was on an unsustainable path. Westward expansion in the nineteenth century continually brought new land into production; thus, good land management was not a priority. Much of the nation’s soil was lost to erosion from exhaustive tillage operations.
Leonard Gianessi, Ashley Williams
openaire   +2 more sources

Stereoselective analysis of acid herbicides in natural waters by capillary electrophoresis

Electrophoresis, 1999
A capillary electrophoretic method for the stereoselective analysis of aryloxypropionic and aryloxyphenoxypropionic acidic herbicides in ground water and river water was performed. Vancomycin and gamma-cyclodextrin were added to the background electrolyte (BGE) as chiral selectors.
POLCARO CM, MARRA C, DESIDERIO C, FANALI S   +3 more
openaire   +5 more sources

Photodegradation of the Herbicides Butachlor and Ronstar Using Natural Sunlight and Diethylamine

Bulletin of Environmental Contamination and Toxicology, 2000
Deterioration of water quality by pesticide residues in rivers has raised environmental safety concerns. Butachlor and ronstar are the two most widely used herbicides in Taiwan. Due to their relatively high stability and retardation factors, butachlor and ronstar were persistent environmental pollutants in waters (Widmer and Spalding, 1995, 1996 ...
Y. J. Lin, A. Lee, K. J. Yeh, Chitsan Lin   +3 more
openaire   +3 more sources

Natural Growth Inhibitors as Allelopathogens and Botanical Herbicides

2003
In the previous chapter we observed the inhibiting properties of leaves secondary substances and their transformation in plant tissues. Some of these products and their metabolites could play a role of allelopathogens or allelochemicals, which are sufficient in plant communities and ecosystems in general.
Valentine I. Kefeli, Maria V. Kalevitch
openaire   +2 more sources

Herbicidal Activity and Site of Action of the Natural Product Sorgoleone

Pesticide Biochemistry and Physiology, 1996
Abstract Inhibition of photosynthetic electron transport in isolated spinach ( Spinacea oleracea L.) thylakoids and competitive binding to spinach, redroot pigweed ( Amaranthus retroflexus L.), and potato ( Solanum tuberosum L.) thylakoids were investigated for sorgoleone (2-hydroxy-5-methoxy-3-[(8′Z, 11′Z)-8′,11′,14′-pentadecatriene]- p ...
Yerkes Carla N, Leslie A. Weston, Stephen C. Weller, Chandrashekhar I. Nimbal   +3 more
openaire   +2 more sources

Cyanobacterin and Analogs: Structure and Activity Relationships of a Natural Herbicide

1987
Cyanobacterin is a secondary metabolite produced by the cyanobacterium, Scytonema hofmanni UTEX 2349, which inhibits the growth of other algae. The compound is a diaryl-substituted γ-lactone (Table 1). Cyanobacterin interrupts photosynthetic electron transport at a site in PS II.
Janet L. Carlson, William J. Thoma, Florence K. Gleason   +2 more
openaire   +2 more sources

Natural Compounds as Potential Herbicides

Weed Technology, 1988
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Glufosinate (Phosphinothricin), A Natural Amino Acid with Unexpected Herbicidal Properties

1994
Glufosinate ammonium (phosphinothricin ammonium) (GLA) is the active ingredient of Basta and several other herbicides used worldwide. It is produced as part of the tripeptide L-phosphinothricyl-L-alanyl-L-alanin, which was first isolated from Streptomyces viridichromogenes or Streptomyces hygroscopicus.
openaire   +2 more sources