Reference

Inhibition of nitrification in soil by acetylenic compounds

Inhibition of nitrification in soil by acetylenic compounds. McCarty, G. W.; Bremner, J. M. (Dep. Agron., Iowa State Univ., Ames, IA 50011, USA). Soil Sci. Soc. Am. J., 50(5), 1198-201 (English) 1986. CODEN: SSSJD4. ISSN: 0361-5995. DOCUMENT TYPE: Journal CA Section: 19 (Fertilizers, Soils, and Plant Nutrition) Section cross-reference(s): 5 Recent work has shown that acetylene [74-86-2] is a potent inhibitor of nitrification in soil. To discover if substituted acetylenes inhibit nitrification in soil, the effects of 17 monosubstituted (HC Y CR) acetylenes (propyne [74-99-7], 1-butyne [107-00-6], 2-ethynylpyridine [1945-84-2], phenylacetylene [536-74-3], 3-butyn-2-one [1423-60-5], 1-phenyl-2-propyn-1-ol [4187-87-5], pentyne [26856-36-0], 4-phenyl-1-butyne [16520-62-0], 5-phenyl-1-pentyne [1823-14-9], 1-ethynylcyclohexylamine [30389-18-5], 2-propyn-1-ol [107-19-7], 2-propyn-1-amine [2450-71-7], 1-hexyne [693-02-7], 3-butyn-1-ol [927-74-2], 1-heptyne [628-71-7], 1-octyne [629-05-0], acetylene monocarboxylic acid [471-25-0]) and of 7 disubstituted (RC Y CR1) acetylenes (2-butyne [503-17-3], 3-phenyl-2-propyn-1-ol [1504-58-1], diphenylacetylene [501-65-5], 2-butyn-1-ol [764-01-2], 2-butyn-1,4-diol [110-65-6], acetylene dicarboxylic acid [142-45-0], 2-butynoic acid [590-93-2]) were studied on prodn. of (NO3- + NO2-)-N in soils treated with (NH4)2SO4. Most of the substituted acetylenes tested inhibited nitrification in soil, and some were potent inhibitors of nitrification. The results with the 4 gaseous compds. tested showed that acetylene, propyne, and 1-butyne inhibited nitrification in soils at partial pressures as low as 0.1 or 1.0 Pa, whereas 2-butyne had little or no effect on nitrification at partial pressures as high as 10 Pa. The data obtained with the 21 nongaseous compds. tested showed that 2-ethynylpyridine, phenylacetylene, and 3-butyn-2-one had the greatest inhibitory effect on nitrification and that acetylene monocarboxylic acid, acetylene dicarboxylic acid, and 2-butynoic acid had the least effect. Studies to measure prodn. of C2H2 in soils treated with the nongaseous compds. showed that the inhibition of nitrification obsd. with these compds. was not due to C2H2 formed by their decompn. in soil. Expts. reported indicate that 2-ethynylpyridine and phenylacetylene compare favorably with nitrapyrin (N-Serve) and etridiazole (Dwell) as soil nitrification inhibitors and have potential practical value for retarding nitrification of fertilizer N in soil.

Use of gas chromatography-mass spectrometry and stable isotopes in the study of the urinary metabolites of pargyline in the rat

Use of gas chromatography-mass spectrometry and stable isotopes in the study of the urinary metabolites of pargyline in the rat. Diehl, Emma; Najm, Samir; Wolff, Robert E.; Ehrhardt, Jean Daniel (Lab. Spectromet. Masse Org. Biomed., Inst. Chim., Strasbourg, Fr.). J. Pharmacol., 7(5), 563-75 (French) 1976. CODEN: JNPHAG. DOCUMENT TYPE: Journal CA Section: 1 (Pharmacodynamics) The urinary metabolites of deuterium labeled pargyline-HCl (PhCH2NMeCH2C.tplbond.CH)(I) [35161-71-8] (5.0 mg, i.v.) were identified in the rat. I was amost completely metabolized. N-demethylpargyline [1197-51-9] and N-methylbenzylamine [103-67-3] predominated. Small quantities of benzylamine [100-46-9] and hydroxy-N-demethylpargyline [62885-16-9] isomers were detected. N-methylpropargylamine [35161-71-8] and propargylamine [2450-71-7] appeared to be presenet but their identity could not be confirmed.