Results 261 to 270 of about 20,777 (287)

A Natural Gradient Transport Study of Selected Herbicides

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)
S. K. Widmer, R. F. Spalding
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Monitoring natural vegetation for herbicide-induced chromosomal aberrations

Mutation Research/Fundamental and Molecular Mechanisms of Mutagenesis, 1976
Abstract The average frequency of spontaneous mitotic chromosome aberrations, determined in 12 weed species growing under natural conditions, was 0.4%. Herbicides induced significant increases in this frequency in five species, Ambrosia artemisiifolia L., Pastinaca sativa L., Solidago canadensis L., Solidago nemoralis Ait., and Vicia cracca
D.J. Tomkins, W.F. Grant
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Sensitized photocatalytic oxidation of herbicides using natural sunlight

Journal of Photochemistry and Photobiology A: Chemistry, 1997
Abstract The sensitized photocatalytic oxidation (SPCO) of the herbicide terbutryne using tris(bipyridyl)ruthenium complexes as sensitizer and titanium dioxide as semiconductor was investigated. Tris(4,4′-dicarboxy-2,2′-bipyridyl)ruthenium(II) chloride is an excellent sensitizer, and on exposure to sunlight complete degradation of the pollutant ...
J. Lobedank, E. Bellmann, J. Bendig
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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 ...
H. A. POWELL, N. W. KERBBY, P. ROWELL
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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 ...
Francisco A, Macías, David, Marín, Alberto, Oliveros-Bastidas, José M G, Molinillo   +3 more
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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
E, Evgenidou, K, Fytianos
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Plant somatic mutations in nature conferring insect and herbicide resistance

Pest Management Science, 2018
AbstractBecause of the role of the meristem in plant growth and reproduction, somatic mutations in plants have long been suspected of conferring herbivore and pathogen resistance on individual plants and, in the case of trees, individual branches within single plants. A few instances of resistance to phytophagous insects owing to somatic mutations have
Daniel Simberloff, Christy Leppanen
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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
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Herbicides: Nature’s unexpected helper

C&EN Global Enterprise, 2022
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Natural degradation ways of herbicides of sulfonylurea group

2017
Currently in agriculture much attention is paid to development and use of low-cost and at the same time effective methods of fight against weeds. In this regard, widely purchased sulfonylurea herbicides. The paper presents the general characteristics, mechanism of action, degradation pathways (hydrolysis, photochemical transformation and microbial ...
Leontiev, V. N., Akhramovich, T. I., Ignatovets, O. S., Lazovskaya, O. I.   +3 more
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