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ethylene oxide/hymenoxys rusbyi
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Polymorphism of glutathione conjugation of methyl bromide, ethylene oxide and dichloromethane in human blood: influence on the induction of sister chromatid exchanges (SCE) in lymphocytes.
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A hitherto unknown glutathione-S-transferase in human erythrocytes displays polymorphism: three quarters of the population ("conjugators") possess, whereas one quarter ("non-conjugators") lack this specific activity. A standard method for the identification of conjugators and non-conjugators with
Structures of linear poly(ethylene oxide) compounds and potassium complexes in dichloromethane.
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The H-1 NMR spectra of a series of linear poly(ethylene oxides) compounds (POE compounds) were measured in dichloromethane-d2 at 25 degrees C, where the POE compounds (HO-(CH2CH2O-)n-R) were unsubstituted POE, HEOn (R=H, n=3, 4, 6), and alkyl-substituted POE, DEOn (R=C12H25, n=4, 6, 8) and MeEO6
Stability of Water/Poly(ethylene oxide)43-b-poly(ε-caprolactone)14/Cyclohexanone Emulsions Involves Water Exchange between the Core and the Bulk.
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The formation of emulsions upon reverse self-association of the monodisperse amphiphilic block copolymer poly(ethylene oxide)43-b-poly(ε-caprolactone)14 in cyclohexanone is reported. Such emulsions are not formed in toluene, chloroform, or dichloromethane. We demonstrate by magnetic resonance
An X-ray spectromicroscopy study of protein adsorption to polystyrene-poly(ethylene oxide) blends.
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Synchrotron-based X-ray photoemission electron microscopy (X-PEEM) and atomic force microscopy (AFM) were used to characterize the composition and surface morphology of thin films of a polystyrene-poly(ethylene oxide) blend (PS-PEO), spun cast from dichloromethane at various mass ratios and polymer
Measurement of frequencies of HPRT mutants, chromosomal aberrations, micronuclei, sister-chromatid exchanges and cells with high frequencies of SCEs in styrene/dichloromethane-exposed workers.
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Frequencies of HPRT mutants (MFs), chromosomal aberrations with or without gaps (CA+; CA-), aberrant cells (AC), micronuclei (MN), sister-chromatid exchanges (SCEs) and cells with high frequencies of SCEs (HFCs) were measured in lymphocytes collected from 46 workers occupationally exposed to styrene
Mannosylated poly(ethylene oxide)-b-poly(epsilon-caprolactone) diblock copolymers: synthesis, characterization, and interaction with a bacterial lectin.
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A novel bioeliminable amphiphilic poly(ethylene oxide)-b-poly(epsilon-caprolactone) (PEO-b-PCL) diblock copolymer end-capped by a mannose residue was synthesized by sequential controlled polymerization of ethylene oxide and epsilon-caprolactone, followed by the coupling of a reactive mannose
Metabolism of dichloromethane (methylene chloride) to formaldehyde in human erythrocytes: influence of polymorphism of glutathione transferase theta (GST T1-1).
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Human hemolysate was incubated in vitro with different concentrations of dichloromethane (methylene chloride). The resulting enzymatically mediated production of formaldehyde was determined by two independent analytical methods (Nash-reaction/colorimetry or HPLC). The formation of formaldehyde from
Fibrous Materials Made of Poly(ε-caprolactone)/Poly(ethylene oxide)-b-Poly(ε-caprolactone) Blends Support Neural Stem Cells Differentiation.
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In this work, we design and produce micron-sized fiber mats by blending poly(ε-caprolactone) (PCL) with small amounts of block copolymers poly(ethylene oxide)m-block-poly(ε-caprolactone)n (PEOm-b-PCLn) using electrospinning.
Evaluation of genome damage in subjects occupationally exposed to possible carcinogens.
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In occupational exposures, populations are simultaneously exposed to a mixture of chemicals. We aimed to evaluate DNA damage due to possible carcinogen exposure (phenylhydrazine, ethylene oxide, dichloromethane, and 1,2-dichloroethane) in lymphocytes of pharmaceutical industry workers from the same
Purification and characterization of a new glutathione S-transferase, class theta, from human erythrocytes.
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A new polymorphic form of glutathione S-transferase (GST), metabolising monohalogenated methanes, ethylene oxide and dichloromethane, has been purified from human erythrocytes and characterized. Several characteristics, such as similar elution patterns on different chromatographic matrices,
[Health risk assessment and ozone formation potentials of volatile organic compounds from pharmaceutical industry in Zhejiang Province].
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In the present study, the main source and characteristics of volatile organic compounds (VOCs) released from pharmaceutical industry in Zhejiang Province were analyzed quantitatively and qualitatively. Based on these results, the internationally recognized evaluation model for health risk assessment
Genetic and individual differences in the process of biotransformation and their relevance for occupational medicine.
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Genetically determined differences in biotransformation of xenobiotics have been identified which are important for occupational medicine. This review highlights the following topics: (i) genetic polymorphisms in the activity of cholinesterases; (ii) polymorphisms in the cytochrome P-450 isozymes
Capillary electrophoresis combining field-amplified sample stacking and electroosmotic flow suppressant for analysis of sulindac and its two metabolites in plasma.
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Field-amplified sample stacking with electroosmotic flow (EOF) suppressant in capillary electrophoresis was used to determine the concentration of sulindac (SU) and its two active metabolites, sulindac sulfide (SI) and sulindac sulfone (SO), in human plasma. After acidification, the analytes were
Two-dimensional liquid chromatography normal-phase and reversed-phase separation of (co)oligomers.
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Many samples contain compounds with various numbers of two or more regular structural groups. Such "multidimensional" samples (according to the Giddings' notation) are best separated in orthogonal chromatographic systems with different selectivities for the individual repeat structural groups,
Formulation and development of gastroretentive drug delivery system for ofloxacin.
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The aim of the present study was to develop a delivery system wherein the retention of ofloxacin could be achieved for increased local action in gastric region against Helicobacter pylori infection. The formulation was optimized on the basis of in vitro buoyancy and in vitro release in citrate
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