[en] The thiocarbamate hebricide S-ethyl-N,N-dipropyl thiocarbamate (EPTC) applied in phytotoxic doses to corn plants inhibits the elongation of the fatty acid precursors of leaf wax lipid constituents. It was found to alter the biosynthesis of the inner lipids of leaves and roots. (author)

[en] Metabolism of acetochlor (2-chloro-N-)2-ethyl-6-methyl-phenyl(-N-)ethoxymethyl(acetamide) herbicide was traced in tolerant corn (Zea mays L.) and sensitive wheat (Triticum aestivum L.). Both resistant and susceptible plant species were found to be able to metabolize acetochlor absorbed. However, a faster metabolism of the herbicide was observed in the tolerant plants. (author)

[en] Effect of acetochlor placement on the uptake and distribution of carbonyl-¹⁴C labelled compound in maize (Zea Mays L.) was followed in time-course experiments using charcoal barrier to separate the roots from shoot in sand culture. The results confirm that the main entrance of acetochlor to maize is through the roots but the uptake by coleoptile also plays an important role in the selectivity of acetochlor. Phytotoxic symptoms caused by acetochlor show good correlation with the site of uptake. (author)

[en] Absorption and translocation of acetochlor (2-chloro-N-)2-ethyl-6-methylphenyl(N-)ethoxymethyl(acetamide) herbicide were followed in experiments with tolerant corn (Zea mays L.) and sensitive wheat (Triticum aestivum L.) plants by using carbonyl-sup(14)C labelled compound. Tolerant plant species absorbed more radioactivity from the nutrient solution than susceptible plant species. However, the root-absorbed radioactivity was translocated to the shoot more readily in the sensitive plants. (author)

[en] Tritium labelled dimethylamine was prepared from benzalmethylimine in reaction with methyl-³H iodide followed by hydrolysis. The product was converted with sodium nitrite in glacial acetic acid into labelled dimethylnitrosamine. The radiochemical yield was 85%. (author)

[en] Acyl group exchange of substituted phenyl acetates with acetic-1-¹⁴C acid catalyzed by pyridine in different solvents was followed kinetically. Structure reactivity relationship and reaction pathway for acyl exchange with acetic acid and acetic anhydride as well as for acetate catalyzed hydrolysis of substituted phenyl acetates are comparatively discussed. The radioactivity was measured by a Tricarb Scintillation Spectrophotometer [Packard Instrument Co]. The IR spectra were recorded on a UR-10 spectrophotometer. Conductrometric and dielectrometric measurements were carried out by using Radelkis equipments. Exchange rates have been calculated from the McKay equation. (F.Gy.)

[en] The labelled compound was prepared by chlorination of [2-¹⁴C]acetone obtained from the barium salt of [1-¹⁴C]acetic acid by pyrolysis. The reaction product 1,1-dichloro[2-¹⁴C]acetone was converted to 2-dichloromethyl-2-methyl[2-¹⁴C]-1,3-dioxolane by condensation with ethylene glycol in the presence of thionyl chloride. Radiochemical yield: 62% based on [1-¹⁴C]acetic acid. (author) 7 refs

[en] If the constituent particles of fluid phases interact via long-ranged van der Waals forces, the effective Hamiltonian for interfaces between such fluid phases contains - in lateral Fourier space - non-analytic terms ∼ q⁴ in q. Similar non-analytic terms characterize the effective Hamiltonian for two interacting interfaces which can emerge between the three possible coexisting fluid phases in binary liquid mixtures. This is in contrast with the structure of the phenomenological Helfrich Hamiltonian for membranes which does not contain such non-analytic terms. We show that under favorable conditions for the bulk densities characterizing a binary liquid mixture and for the long-ranged interparticle interactions the corresponding effective Hamiltonian for a model fluid membrane does not exhibit such non-analytic contributions. We discuss the properties of the resulting effective Hamiltonian, with a particular emphasis on the influence of the long range of the interactions on the coefficient of the bending rigidity. (authors)

[en] The uptake and translocation of ¹⁴C labelled acetochlor and EPTC herbicides were followed in experiments with maize (Zea mays L.) and mustard (Sinapis alba L.) in nutrient solutions. Radioactivity data were comparatively evaluated for approaching the origin of the different phytotoxicity of these herbicides to the plants used. Results obtained are in good agreement with the extent and symptoms of herbicide injury on maize and mustard plants grown in acetochlor or EPTC treated sand. (author)

No abstract available