Arvensis

Artificial materials include aUphatic, aromatic, and terpene compounds that are made synthetically as opposed to those isolated from natural sources. As an example, ben2aldehyde may be made synthetically or obtained from oil of bitter almond (51) and t-menthol may be made synthetically or isolated from oil of Mentha arvensis var. to give Bra2iUan mint oil or com mint oil. 

Menthol Manufacture. Of the menthol isomers, only (-)-menthol [2216-51 -5] and (+)-menthol [15356-70-4] are of commercial importance. The most important natural sources of (—)-menthol are the oUs of Mentha arvensis (75—90%) and Mentha piperita (50—65%). The main suppUers ate Japan, China, BrazU, and Taiwan for the former and the United States, CIS, Bulgaria, and Italy for the latter. (—)-Menthol is known for its refreshing, diffusive odor characteristic of peppermint. It also is known for its strong physiological cooling effect, which is useful in cigarettes, dentifrices, cosmetics, and pharmaceuticals. 

Natural menthol is obtained by freezing the essential oU, eg, Mentha arvensis and the menthol crystals ate separated by centrifuging the supernatant hquid away from the crystals. The supernatant oU is then caUed dementholized cornmint oU. Impurities in the crystals come from the essential oU and usuaUy give a slight peppermint aroma to the crystallized menthol. The cornmint oU, rich in (—)-menthone (- 28%) and (—)-menthol (- 32%), can be further processed to give additional natural menthol. 

Pyraflufen-ethyl was primarily developed as a cereal herbicide to control a broad spectrum of broadleaf weeds. Pyraflufen-ethyl applied in early postemergence at 12 g a.i. ha provides excellent control of some important weeds such as Anthemis arvensis, Lamium purpureum and Sinapis arvensis and good suppression of Matricaria chamomilla, Stel-iaria media, Veronica persica and Viola spp. 

Almudena B, Amparo BM, Rao SK, Cortes D. Styryl-pyrones from Goniothalamus arvensis. Phytochemistry 1998 47 1375-1380. 

L., C. arvensis L. (seed and rizoma-propagated), Cynodon dactylon (L.) Pers. (seed-propagated), Equisetum arvense L., E. ramosissimum Desf., Oxalis corniculata L., Plantago spp., Sorghum halepense (L.) Pers. (seed-propagated)... 

Canada thistle Cirsium arvense (L.) Scop., quack grass E.s repens (L.) Gould, barnyard grass E. crus-galli (L.) P. Beauv., monochoriaMonochoria vaginalis (Burm. F.) C. Presl ex Kunth Wild mustard Sinapis arvensis L. 

Residues incorporated or Dandelion Taraxacum officinale L. Weber, perennial on the soil surface sowthistle Sonchus arvensis L., kochia Kochia... 

Except direct use of allelopathic crops as cover crops, smother crops, and intercrops, applications of allelopathy for weed control include the use of allelopathic residues as an herbicide agent, e.g., pellets flours, water extracts, etc. The most common example of crop residue utilization is application of straw on the soil surface (mulching), e.g., rice straw inhibited germination of field bindweed (Convolvulus arvensis L.), winter wild oat (Avena ludoviciana Durieu), and little-seed canarygrass (Phalaris minor Retz.) (Lee et al. 1991 Tamak et al. 1994 Young et al. 1989). 

The most promising allelopathic weeds are hawkweeds (Hieracium spp.). They are effective in reducing other asteraceous weeds (Murphy and Aarssen 1995b) and yellow hawkweed (H. pratense Tausch.) inhibited Canada thistle (Cirsium arvense (L.) Scop.), perennial sow-thistle (Sonchus arvensis L.), yarrow (Achillea millefolium L.), and annual sow thistle (Sonchus oleraceus L.) however, the long-term effect on perennial species is unclear (Murphy 2001). 

The diuretic and cholagog effect of Ononis arvensis motivated the development of a new two-dimensional paper chromatographic and TLC method for the measurement of onion in its roots and aerial parts. Samples were dried, ground and extracted with methanol (70 per cent, w/v) for 2 h. The supernatant was diluted and used for TLC separation on a cellulose stationary phase. The first eluent was 3 per cent formic acid, and the second was n-butanol-acetic acid-water (4 1 5, v/v) for both TLC and paper chromatography. Spots were scraped off, extracted with methanol and the absorption was measued at 260 nm. It was found that the average ononin content in roots and aerial parts was 0.153 0.0278 (per cent) and 0.498 0.045 (per cent), respectively. Because of the simplicity, the method was... 

J. Spilkova, J. Dusek, P. Solich, J. Stranska and K. Ruzickova, Application of two-dimensional chromatography for determination of ononin in the roots and aerial parts of Ononis arvensis L./. Plan. Chromatogr.—Mod TLC. 9 (1996) 299-302. 

Devine, M.D. and Born, W.H.V. Absorption, translocation, and foliar activity of clop3nalid and chlorsnlfuron in Canada thistle (Cirslum arevens and perennial sowthisde (Sonchus arvensi, WeedScL, 33 524-530, 1985. 

Neuromuscular blocking activity. Decoction of the seed oil, administered orally to adults of both sexes at a dose of 4.6 g/per-son, was active. A mixture of Piper longum, Zingiber officinale, Piper cubeba, Curcuma zedoaria, Juniperus communis, Cichorium intybus, Mentha arvensis. Commiphora mukul, and Sesamum indicum was given. Twenty five patients with laquwa (spastic facial paralysis) were treated with this mixture in divided doses of 4.6 g in 24 hours. Six grams of a decoction of Lavendula stoechas was also given in some cases. Sev-... 

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