Zobrazeno 1 - 10
of 222
pro vyhledávání: '"Karsten Levsen"'
Autor:
Helga Idel, Edith Berger-Preiss, Wolfgang Hadnagy, Ulrich Ranft, Dorothee Sugiri, Karsten Levsen, G. Leng
Publikováno v:
International Journal of Hygiene and Environmental Health. 208:193-199
House dust and airborne particles (PM) were sampled before (T1) and 1 day (T2), 4-6 months (T3) as well as 10-12 months (T4) after a pest control operation (PCO). Cyfluthrin was applied in 11, cypermethrin in 1, deltamethrin in three and permethrin i
Publikováno v:
Journal of Chromatography B. 798:265-274
Verapamil is a widely prescribed calcium antagonist, but suffers from extensive first pass metabolism. Despite its frequent use in drug metabolism a complete understanding of its metabolic pathway is still lacking. We thus investigated verapamil’s
Publikováno v:
Journal of Chromatography B. 795:195-207
This work describes a gas chromatographic-mass spectrometric method employing negative chemical ionization (NCI) for the determination of E-cis/trans-chrysanthemumdicarboxylic acid (CDCA) in human urine used as a biomarker for the exposure to pyrethr
Publikováno v:
Xenobiotica. 33:655-676
1. Verapamil is a well-known and world-wide prescribed calcium antagonist, but it suffers from extensive first-pass metabolism. Although it has been marketed for many years, a complete understanding of its biotransformation in humans is still lacking
Publikováno v:
Analytical and Bioanalytical Chemistry. 374:1179-1186
The potential of three genetic changes introduced into mice by the transgenic or knockout technology aimed at immortalizing hepatocytes in vitro and concomitantly preserving their differentiated hepatic functions was analyzed. Six hepatocyte lines we
Publikováno v:
Journal of Chromatography A. 963:325-334
A restricted access material (RAM), alkyl-diol-silica (ADS), was used to prepare a highly bio-compatible solid-phase microextraction (SPME) capillary for the automated and direct in-tube extraction of several benzodiazepines from human serum. The bif
Publikováno v:
Analytical Chemistry. 74:1695-1701
An automated in-tube solid-phase microextraction (SPME) HPLC analysis method for 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK) and several metabolites has been developed. NNK is one of the tobacco-specific N-nitrosamines (TSNA), which has been
Publikováno v:
Journal of Chromatography A. 917:75-86
A combination of matrix solid-phase dispersion extraction (MSPD) and LC–NMR–MS hyphenation is proposed as a rapid screening method of natural products for unknown compounds. In this report, this new analytical approach is applied for the first ti
Autor:
Elke Ilgen, Karsten Levsen, Joachim Heinrich, Jürgen Angerer, P. Schneider, H.-Erich Wichmann
Publikováno v:
Atmospheric Environment. 35:1253-1264
The concentrations of the aromatic hydrocarbons benzene, toluene, ethylbenzene and the isomeric xylenes (BTEX) have been determined in the indoor air of 115 private non-smoker homes (~380 individual rooms) situated in areas with an extreme traffic si