نتایج جستجو برای: styrene butadienestyrene

تعداد نتایج: 6503  

2015
Michel Oelschlägel Claudia Heiland Michael Schlömann Dirk Tischler

The styrene oxide isomerase (SOI) represents a membrane-bound enzyme of the microbial styrene degradation pathway and has been discussed as promising biocatalyst. It catalyzes the isomerization of styrene oxide to phenylacetaldehyde. In this study a styC gene, which encodes the SOI of Rhodococcus opacus 1CP, was optimized for optimal expression in Escherichia coli BL21(DE3) pLysS. The expressio...

Journal: :FEMS microbiology reviews 2002
Niall D O'Leary Kevin E O'Connor Alan D W Dobson

The last few decades have seen a steady increase in the global production and utilisation of the alkenylbenzene, styrene. The compound is of major importance in the petrochemical and polymer-processing industries, which can contribute to the pollution of natural resources via the release of styrene-contaminated effluents and off-gases. This is a cause for some concern as human over-exposure to ...

Journal: :British journal of industrial medicine 1985
C Edling K Ekberg

To determine whether exposure to low levels of styrene (below 110 mg/m3) causes acute behavioural effects and symptoms that may be related to concentrations of styrene in air or urinary mandelic acid or both, 12 men occupationally exposed to styrene were studied and compared with a reference group of 10 unexposed men. Simple reaction time was measured before and after work and information about...

Journal: :Industrial health 2009
Gerhard Triebig Philipp Werner Holger Zimmer

PURPOSE OF THE STUDY The purpose of this study is to examine the effectiveness of several types of personal respiratory protection equipment at styrene exposed laminators under real work place conditions. SUBJECTS AND METHOD 99 male styrene exposed workers were examined. During their lamination activities the average styrene concentrations in air ranged between 30 to 60 ppm (maximum: 205 ppm)...

Background: Volatile organic compounds (VOCs) are one of the most important and prevalent air pollutants. The vapor produced as a result of the vaporization ‎of these compounds, even at very low concentrations, is harmful to the environment and human health. Thus, the aim of this study was to evaluate the removal of styrene vapor from the air flow using Zeolite ‎(ZSM-5) in a continuous ...

Journal: :American journal of epidemiology 1996
E Welp M Kogevinas A Andersen T Bellander M Biocca D Coggon J Esteve V Gennaro H Kolstad I Lundberg E Lynge T Partanen A Spence P Boffetta G Ferro R Saracci

Chronic low-dose exposure to solvents has been associated in epidemiologic studies with chronic neurotoxicity, but the evidence is not consistent. Styrene causes acute disturbances in the central and peripheral nervous systems. To determine if exposure to styrene may contribute to chronic diseases of the central nervous system, the authors examined mortality from nervous system diseases, mental...

Journal: :The Journal of organic chemistry 2015
Tsugio Kitamura Kensuke Muta Juzo Oyamada

Fluorination of styrene derivatives with a reagent system composed of μ-oxo-bis[trifluoroacetato(phenyl)iodine] and a pyridine·HF complex gave the corresponding (2,2-difluoroethyl)arenes in good yields. Similarly, the reagent of PhI(OCOCF3)2 and the pyridine·HF complex acted as a fluorinating agent for styrene derivatives. The fluorination of styrene derivatives with the pyridine·HF complex und...

2017
George Cruzan James S. Bus Marcy I. Banton Satinder S. Sarang Robbie Waites Debra B. Layko James Raymond Darol Dodd Melvin E. Andersen

Styrene is a mouse-specific lung carcinogen, and short-term mode of action studies have demonstrated that cytotoxicity and/or cell proliferation, and genomic changes are dependent on CYP2F2 metabolism. The current study examined histopathology, cell proliferation, and genomic changes in CD-1, C57BL/6 (WT), CYP2F2(-/-) (KO), and CYP2F2(-/-) (CYP2F1, 2B6, 2A13-transgene) (TG; humanized) mice foll...

Journal: :Journal of cell science 1991
H M Kowalczynska J Kaminski

The static adhesion of living L1210 cells (in serum-containing medium) to the surface of (styrene/methylmethacrylate) copolymers differing in styrene content (from 5% to 50% of styrene units) was investigated. The examination of wettability of the copolymer surfaces showed that the contact angle of water on the hydrophobic surfaces is an increasing linear function of styrene content in the copo...

Journal: :Applied and environmental microbiology 2008
Bruno Bühler Jin-Byung Park Lars M Blank Andreas Schmid

Styrene can efficiently be oxidized to (S)-styrene oxide by recombinant Escherichia coli expressing the styrene monooxygenase genes styAB from Pseudomonas sp. strain VLB120. Targeting microbial physiology during whole-cell redox biocatalysis, we investigated the interdependency of styrene epoxidation, growth, and carbon metabolism on the basis of mass balances obtained from continuous two-liqui...

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