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Showing 25 to 36 of 934 entries
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Elucidation of sources, pathways and fate of dioxins, furans and PCBs requires performant analysis techniques.

Talanta

Baeyens W, Verstraete F, Goeyens L.
PMID: 18969539
Talanta. 2004 Aug 08;63(5):1095-100. doi: 10.1016/j.talanta.2004.06.010.

No abstract available.

Fast sample preparation involving MASE and coupled column normal phase liquid chromatography for the rapid trace analysis of dioxins in air-dust samples from fire catastrophe emissions.

Talanta

van Beuzekom AC, Hijman WC, Berkhoff CJ, Stoffelsen BH, den Boer AC, Groenemeijer GS, Mooibroek D, Hoogerbrugge R, Broekman MH, Baumann RA, Hogendoorn EA.
PMID: 18969547
Talanta. 2004 Aug 08;63(5):1183-91. doi: 10.1016/j.talanta.2004.05.026.

A new approach has been developed and tested for the urgent analysis of dioxins in samples of air-dust filters originating from catastrophe emissions. The procedure consists of a fast extraction of the sample with microwave solvent extraction (MASE) and...

Study of the interference problems of dioxin-like chemicals with the bio-analytical method CALUX.

Talanta

Schroijen C, Windal I, Goeyens L, Baeyens W.
PMID: 18969556
Talanta. 2004 Aug 08;63(5):1261-8. doi: 10.1016/j.talanta.2004.05.036.

The reporter gene expression method CALUX has proven to be a very valuable screening technique for assessing toxic equivalents of dioxins and dioxin-like compounds, because it detects all AhR ligands in a variety of sample matrices. However, the exact...

Accurate two-dimensional model of an arrayed-waveguide grating demultiplexer and optimal design based on the reciprocity theory.

Journal of the Optical Society of America. A, Optics, image science, and vision

Dai D, He S.
PMID: 15603076
J Opt Soc Am A Opt Image Sci Vis. 2004 Dec;21(12):2392-8. doi: 10.1364/josaa.21.002392.

An accurate two-dimensional (2D) model is introduced for the simulation of an arrayed-waveguide grating (AWG) demultiplexer by integrating the field distribution along the vertical direction. The equivalent 2D model has almost the same accuracy as the original three-dimensional model...

Asymmetric catalysis by chiral lanthanide complexes in water.

Chirality

Dickins RS, Gaillard S, Hughes SP, Badari A.
PMID: 15986504
Chirality. 2005 Aug;17(7):357-63. doi: 10.1002/chir.20171.

The development of catalytic, asymmetric transformations in water is a challenging task. The lanthanides are becoming reagents of choice for many Lewis acid-catalyzed reactions in aqueous media as they are water tolerant. However, enantioselective reactions catalyzed by lanthanides are...

Comparative study of the integration density for passive linear planar light-wave circuits based on three different kinds of nanophotonic waveguide.

Applied optics

Dai D, Shi Y, He S.
PMID: 17304311
Appl Opt. 2007 Mar 01;46(7):1126-31. doi: 10.1364/ao.46.001126.

A theoretical analysis and comparison of the integration density are given for passive planar lightwave circuits based on three different kinds of nanophotonic waveguide, namely, photonic crystal waveguides, Si nanowire waveguides, and nanoslot waveguides. Two criteria for determining the...

Sensitive and selective analysis of polychlorinated dibenzo-p-dioxins/dibenzofurans and their precursors by supersonic jet/resonance-enhanced multiphoton ionization/time-of-flight mass spectrometry.

Analytical sciences : the international journal of the Japan Society for Analytical Chemistry

Uchimura T.
PMID: 16379376
Anal Sci. 2005 Dec;21(12):1395-400. doi: 10.2116/analsci.21.1395.

Polychlorinated dibenzo-p-dioxins/dibenzofurans (PCDD/Fs), some of which are extremely toxic, are present at low concentrations in incinerator flue gases. The on-line real-time measurement of these compounds is necessary, since these concentrations fluctuate drastically with the process conditions used. Supersonic jet/resonance-enhanced...

Analysis of dioxins by gas chromatography/resonance-enhanced multiphoton ionization/mass spectrometry using nanosecond and picosecond lasers.

Analytical chemistry

Li A, Uchimura T, Watanabe-Ezoe Y, Imasaka T.
PMID: 21126023
Anal Chem. 2011 Jan 01;83(1):60-6. doi: 10.1021/ac101849w. Epub 2010 Dec 02.

Dioxins in a soil sample were measured using gas chromatography/resonance-enhanced multiphoton ionization/time-of-flight mass spectrometry coupled with different types of laser sources. The fourth-harmonic emission (266 nm) of a nanosecond Nd:YAG laser (1 ns) provided low ionization efficiency, especially for...

Novel concept for ultracompact polarization splitter-rotator based on silicon nanowires.

Optics express

Dai D, Bowers JE.
PMID: 21643354
Opt Express. 2011 May 23;19(11):10940-9. doi: 10.1364/OE.19.010940.

A novel concept for an ultracompact polarization splitter-rotator is proposed by utilizing a structure combining an adiabatic taper and an asymmetrical directional coupler. The adiabatic taper structure is singlemode at the input end while it becomes multimode at the...

Method development for the analysis of polybrominated dibenzo-p-dioxins, dibenzofurans and diphenyl ethers in sediment samples.

Talanta

Wang D, Jiang G, Cai Z.
PMID: 19071671
Talanta. 2007 Apr 30;72(2):668-74. doi: 10.1016/j.talanta.2006.11.038. Epub 2007 Jan 08.

A column chromatography procedure was developed for the clean-up of solvent-extracted sediment samples for the fractionation of polybrominated diphenyl ethers (PBDEs) and polybrominated dibenzo-p-dioxins and dibenzofurans (PBDD/Fs). The procedure included multiple column chromatography steps for clean-up for the separation...

Optimization of pressurized liquid extraction (PLE) of dioxin-furans and dioxin-like PCBs from environmental samples.

Talanta

Antunes P, Viana P, Vinhas T, Capelo JL, Rivera J, Gaspar EM.
PMID: 18585164
Talanta. 2008 May 30;75(4):916-25. doi: 10.1016/j.talanta.2007.12.042. Epub 2008 Jan 06.

Pressurized liquid extraction (PLE) applying three extraction cycles, temperature and pressure, improved the efficiency of solvent extraction when compared with the classical Soxhlet extraction. Polychlorinated-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs) and dioxin-like PCBs (coplanar polychlorinated biphenyls (Co-PCBs)) in two Certified...

High-resolution mapping of evolutionary trajectories in a phage.

Genome biology and evolution

Dickins B, Nekrutenko A.
PMID: 20333199
Genome Biol Evol. 2009 Aug 11;1:294-307. doi: 10.1093/gbe/evp029.

Experimental evolution in rapidly reproducing viruses offers a robust means to infer substitution trajectories during evolution. But with conventional approaches, this inference is limited by how many individual genotypes can be sampled from the population at a time. Low-frequency...

Showing 25 to 36 of 934 entries