Essential oil composition of Artemisia herba-alba from southern Tunisia. (57/184)

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A cluster of children with seizures caused by camphor poisoning. (58/184)

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Determination of camphor and borneol in Flos Chrysanthemi Indici by UAE and GC-FID. (59/184)

In the work, ultrasonic-assisted extraction (UAE) followed by gas chromatography with flame ionization detector (GC-FID) is developed for the quantitative analysis of the bioactive components of camphor and borneol in a traditional Chinese medicine (TCM) of Flos Chrysanthemi Indici. The extraction parameters are investigated. The optimum extraction conditions found are: solvent, methanol; solvent to sample ratio, 12:1 (v/w); extraction time, 15 min. Camphor and borneol are determined using this extraction method in Flos Chrysanthemi Indici samples from 5 different growing areas. The relative standard deviation values for camphor and borneol are 8.4% and 5.6%, respectively. The recoveries for camphor and borneol are 89% and 95%, respectively, and the method detection limits are lower than 0.23 microg/mL. To demonstrate the method feasibility, steam distillation is also used to analyze camphor and borneol in Flos Chrysanthemi Indici samples from these different growing areas. The statistical comparison by t-test (95% confidence level) showed no significant difference between these results. It has been shown that the proposed UAE-GC-FID is a simple, rapid, and reliable method for quantitative analysis of camphor and borneol in TCM, and a potential tool for quality assessment of Flos Chrysanthemi Indici.  (+info)

Tricistronic overexpression of cytochrome P450cam, putidaredoxin, and putidaredoxin reductase provides a useful cell-based catalytic system. (60/184)

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Spontaneous resolution of racemic camphorates in the formation of three-dimensional metal-organic frameworks. (61/184)

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Iodine-catalyzed synthesis of five-membered cyclic ethers from 1,3-diols under solvent-free conditions. (62/184)

Intramolecular etherification of 1,3-diols was investigated using iodine as a catalyst under solvent-free conditions. The reaction proceeded to completion in a heterogeneous system. Five-membered cyclic ethers were obtained by intramolecular cyclization of 1,3-diols with dehydration. A propella ether (11-oxatricyclo[4.4.3.0(1,6)]tridecane) was conveniently synthesized from a 1,3-diol (6-(2-hydroxyethyl)spiro[4.5]decan-6-ol) in 86% yield with carbon skeleton rearrangement under the following conditions: a temperature of 60 degrees C, a molar ratio of 1,3-diol:iodine = 1:0.2, and a time period of 3 h. Bicyclic ethers were also obtained from the corresponding 1,3-diols, but spiro ethers were obtained in lower yield. Terpenic cyclic ethers were efficiently synthesized from the corresponding 1,3-diols, derived from (+)-camphor and (-)-fenchone. In the case of etherification with a mechanism of carbon skeleton rearrangement, the yield of the solvent-free reaction was as high as that of the corresponding reaction in solution. Etherification reactions with carbon skeleton rearrangement proceeded more smoothly than those with hydride shift.  (+info)

Effect of photoinitiator system and water content on dynamic mechanical properties of a light-cured bisGMA/HEMA dental resin. (63/184)

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Wavelet and fractal analysis of rat brain activity in seizures evoked by camphor essential oil and 1,8-cineole. (64/184)

We investigated the rat brain activity in acute seizures evoked by camphor essential oil or its main constituent 1,8-cineole by wavelet (primarily) and fractal analysis. Experiments were performed on anesthetized animals before and after intraperitoneal camphor oil or cineole administration. The properties of frequency bands in pre-ictal, ictal and inter-ictal stages have been determined by wavelet analysis. The domination of delta frequency band was confirmed in obtained brain activities, which participate with approximately 45% of mean relative wavelet energy (MRWE) in control signals and arise up to approximately 76% MRWE in energy spectrum during the ictal stage (after drug administration). Other frequency bands decreased during ictal stage and arised in inter-ictal stage. There was a dosedependent response of cineole effect: increase in cineole concentration leaded to the higher values of relative wavelet energy (RWE) of delta frequency band while there were slight changes of the mean fractal dimension (FD) values as a measure of system complexity.  (+info)