geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Study of the mode of action of some nitrodiphenyl ethers


, : Study of the mode of action of some nitrodiphenyl ethers. Free Radical Research Communications 10(1-2): 85-93

Nitrosoderivatives of the nitrodiphenyl ether herbicides (nitrofen, bifenox) have been studied. UV irradiation in different organic solvents gives degradation products. In buffered aqueous media, in the presence of chloroplasts and spin traps such as DMPO, hydroxy and peroxy radicals have been characterized. In organic media and in the presence of spin traps such as DMPO, PBN, 4-POBN, solvent radicals (.CHCl2, .CCl3, .CH2 [symbol: see text]) have been formed. Nitro-derivatives have been studied under UV irradiation and in the presence of tetramethylethylene (TME), alkenylhydroxylamines are formed which autoxidize in nitroxide radicals. The formation of the stable nitroxide radical occurs in the dark process after continuous irradiation. The intensity of the signal decreases strongly when a new irradiation is applied. Radical species, with analogous ESR spectral characteristics are formed on reaction with nitrodiphenyl ethers and fatty acids. The reactivity of these herbicides in micellar media (SDS, Brij 35, and CTAB) has been investigated. The kinetics of formation of the ESR signal corresponding to the photoreduction of the nitrodiphenyl ether in the presence of TME behave differently in a micellar environment as compared to solution. The intensity of the formation of the nitroxide increases under irradiation and decreases in the dark; the rotational correlation time tau c has been determined for each type of micelle. Synthetic nitrosodiphenyl ether made by the reduction of nitrodiphenyl ether using hydrogen gas and PtO2 as a catalyst gives the corresponding amine, which is oxidized with meta-chloroperbenzoic acid (m.CPBA). The nitrosodiphenyl ether in the presence of soja azolectin liposome containing a fluorescent probe has been analysed.

US$29.90

PMID: 2165990


Other references

Newman Dianne K.; Gralnick Jeffrey A., 2005: What genetics offers geobiology. Reviews in Mineralogy and Geochemistry 59(1): 9-26

Cheng, A.; Wang, S.; Cai, J.; Rao, M.S.; Mattson, M.P., 2003: Nitric oxide acts in a positive feedback loop with BDNF to regulate neural progenitor cell proliferation and differentiation in the mammalian brain. Nitric oxide (NO) is believed to act as an intercellular signal that regulates synaptic plasticity in mature neurons. We now report that NO also regulates the proliferation and differentiation of mouse brain neural progenitor cells (NPCs). Treatme...

Torr, SJ., 1990: Dose responses of tsetse flies (Glossina) to carbon dioxide, acetone and octenol in the field. Studies were conducted in Zimbabwe of the catch of G. pallidipes from an electric net plus target baited with mixtures of acetone plus carbon dioxide or 1-octen-3-ol (octenol) plus carbon dioxide. For acetone dispensed alone at 5-50 000 mg h-1, 10...

Stull, D.E.; Roberts, L.; Frank, L.; Heithoff, K., 2007: Relationship of nasal congestion with sleep, mood, and productivity. To explore the impact of nasal congestion alone relative to a full set of allergic rhinitis (AR) symptoms on sleep, fatigue, daytime somnolence, and work and school productivity in a 15-day prospective, naturalistic study. Patients (N = 404) recei...

Wolkowitz, O.M., 1990: Use of the dexamethasone suppression test with mentally retarded persons: review and recommendations. The correct methodology for performing the Dexamethasone Suppression Test (DST), which has been widely studied in psychiatry for its possible utility as a laboratory test of depression, was reviewed. Factors that may invalidate the test by produci...

Ankermann, H.; Hoffmann, H.; Kny, L.; Koch, H.; Metzner, R.; Richter, J., 1970: Suggestions for a simplification of drug prescription. Das Deutsche Gesundheitswesen 25(21): 960-964

do Nascimento Borges, Bárbara.; Burbano, R.Mario.Rodriguez.; Harada, M.Lúcia., 2013: Analysis of the methylation patterns of the p16 INK4A, p15 INK4B, and APC genes in gastric adenocarcinoma patients from a Brazilian population. Gastric cancer is a major public health problem in Pará state, where studies suggest complex genetic and epigenetic profiles of the population, indicating the need for the identification of molecular markers for this tumor type. In the present st...

Meiler, B.; Andrich, Jürgen.; Müller, T., 2007: Rapid switch from oral antiparkinsonian combination drug therapy to duodenal levodopa infusion. Six patients with Parkinson's disease (PD) with severe motor complications were directly switched from their oral antiparkinsonian combination drug regime to nasoduodenal levodopa infusion without previously recommended transient treatment wi...

Peters, S., 1978: The dental practice of the future. Quintessenz Journal 8(8): 39-42

Potter, Ef, 1979: Ruby-crowned kinglet seen in late July in Franklin County, N.C. Chat Raleigh 43(2): 36