Results 301 to 310 of about 105,475 (327)

Photolysis of natural β-triketonic herbicides in water

Water Research, 2015
The fate of four natural β-triketones (leptospermone, isoleptospermone, grandiflorone and flavesone, pKa = 4.0-4.5) in aqueous solution, in the dark and upon simulated solar light irradiation was investigated. In anionic form, β-triketones undergo slow dark oxidation and photolysis with polychromatic quantum yields varying from 1.2 × 10(-4) to 3.7 × 10(
Claire Richard, Claire Richard, Patrick Mazellier, Charles L. Cantrell, Aurélien Trivella, Franck E. Dayan, Malgorzata Stawinoga   +6 more
openaire   +4 more sources

Natural and Synthetic Podolactones with Potential Use as Natural Herbicide Models

Journal of Agricultural and Food Chemistry, 2000
A collection of 11 natural and synthetic podolactones have been tested as allelochemicals in a range between 10(-4) and 10(-9) M, and their potential use as natural herbicide models is discussed. Their effects on the germination and growth of the dicots Lactuca sativa (cv. Nigra and cv.
Eduardo Cabrera, Francisco A. Macías, Pedro C. Pacheco, David Jiménez-González, Alejandro F. Barrero, Ana M. Simonet   +5 more
openaire   +3 more sources

Mobility of herbicides in natural soil columns

Communications in Soil Science and Plant Analysis, 1994
Abstract A description is offered of the equipment needed to determine herbicide mobility in natural soil columns. The devices were developed to extract intact soil cores from the field and to remove the soil cores from the stainless steel tubes. The method was applied to the mobility of metamitron in two soils.
M. Sanchez‐Camazano, M. Arienzo, L. F. Lorenzo‐Martin   +2 more
openaire   +2 more sources

Ecotoxicological effects of conventional herbicides and a natural herbicide on freshwater fish (Danio rerio)

Journal of Environmental Science and Health, Part B, 2022
The contamination of aquatic environments has increased over time, affecting environmental integrity and human health. Herbicides represent a source of this contamination, and among the most commercialized are the triazines and glyphosate. In contrast, there are natural herbicides, which are less harmful to the environment. The aim of this study was to
Larissa Lechinovski, Mayomie Bados, Jonathan Rosa, Deise Borchhardt Moda, Ana Carolina de Deus Bueno Krawczyk   +4 more
openaire   +2 more sources

Natural tolerance of cyanobacteria to the herbicide glyphosate

New Phytologist, 1991
summary Synechocystis PCC 6803 and Anabaena variabilis ATCC 29413 showed a high degree of tolerance to the herbicide glyphosate, applied as the free acid, the monoisopropylamine salt or the commercial formulation (Roundup > R). Differential toxicity between herbicide formulations was observed (Roundup > isopropylamine salt > free acid) and ...
N. W. Kerbby, P. Rowell, H. A. Powell
openaire   +2 more sources

A Natural Gradient Transport Study of Selected Herbicides [PDF]

Journal of Environmental Quality, 1995
AbstractThe behavior of trace quantities of commonly detected herbicides and herbicide degradates was investigated in a shallow sand and gravel aquifer. In 1991, a solute pulse containing approximately 15 mg L−1 bromide, 3 μg L−1 atrazine (2‐chloro‐4‐ethylamino‐6‐isopropylamino‐1,3,5‐triazine), 2 μg L−1 alachlor (2‐chloro‐2′,6′‐diethyl‐N‐(methoxymethyl)
R. F. Spalding, S. K. Widmer
openaire   +1 more source

Rationale for a natural products approach to herbicide discovery

Pest Management Science, 2012
AbstractWeeds continue to evolve resistance to all the known modes of herbicidal action, but no herbicide with a new target site has been commercialized in nearly 20 years. The so‐called ‘new chemistries’ are simply molecules belonging to new chemical classes that have the same mechanisms of action as older herbicides (e.g.
Stephen O. Duke, Franck E. Dayan, Daniel K. Owens   +2 more
openaire   +3 more sources

The Use of Allelopathic Studies in the Search for Natural Herbicides

Journal of Crop Production, 2001
Summary The use of herbicides is claimed to negatively affect the environment and actually it does not represent an appropriate tool for the control of some weeds developing resistance. Allelopathic studies offer a challenge for discovering new lead compounds with new target sites. Then, they might be able to control the actual resistant weeds.
Diego Castellano, Ana M. Simonet, Francisco A. Macías, Juan C. G. Galindo, José M. G. Molinillo, Rosa M. Varela   +5 more
openaire   +2 more sources

Degradation and Transformation of a Potential Natural Herbicide in Three Soils

Journal of Agricultural and Food Chemistry, 1999
The methyl ester of fusaric acid (ME) is one of four toxins produced by the fungus Fusarium nygamai, which could be used as a natural herbicide against Striga hermonthica, a parasitic weed of sorghum and corn in a vast zone of West and Central Africa.
Vischetti C, Esposito A
openaire   +4 more sources

Optimization of Benzoxazinones as Natural Herbicide Models by Lipophilicity Enhancement

Journal of Agricultural and Food Chemistry, 2006
Benzoxazinones are plant allelochemicals well-known for their phytotoxic activity and for taking part in the defense strategies of Gramineae, Ranunculaceae, and Scrophulariceae plants. These properties, in addition to the recently optimized methodologies for their large-scale isolation and synthesis, have made some derivatives of natural products, 2,4 ...
David Marín, † and Alberto Oliveros-Bastidas, Francisco A. Macías, José M. G. Molinillo   +3 more
openaire   +3 more sources