Aims. Galactic globular cluster (GC) stars exhibit abundance patterns which are not shared by their field counterparts, e.g. the well documented O-Na and Mg-Al anticorrelations. A widely held hypothesis is that the gas was “polluted” by stars more massive than the presently observed low-mass stars. In the framework of this “self-enrichment” scenario for GCs, we present a new method to derive th...

PURPOSE Syrah red grapes are used in the production of tannin-rich red wines. Tannins are high molecular weight molecules, proanthocyanidins (PAs), and poorly absorbed in the upper intestine. In this study, gut microbial metabolism of Syrah grape phenolic compounds was investigated. METHODS Syrah grape pericarp was subjected to an enzymatic in vitro digestion model, and red wine and grape ski...

Volatiles collections and cuticular extracts of the wheat stem sawfly, Cephus cinclus Norton (Hymenoptera; Cephidae), were analyzed by coupled gas chromatographic-electroantennographic detection (GC-EAD) in order to detect possible pheromone components ofthis species. Volatiles collections from male and female sawflies contained the same 13 GC-EAD-active compounds that stimulated both male and ...

The European research project DIFFERENCE (“Dioxins in Food and Feed – Reference methods and New Certified Reference Materials”) was focussed on the development of alternative methods for the analysis of polychlorinated dibenzodioxins (PCDDs), dibenzofurans (PCDFs) and dioxin-like polychlorinated biphenyls (dl-PCBs) using comprehensive multi-dimensional gas chromatography (GC ́GC), gas chromatogr...

The applicability of GC, GC/MS and liquid chromatography with tandem mass spectrometry (LC/MS/MS) to screening for 140 pesticides in agricultural products was examined. Validation of multi-residue screening methods for the determination of 88 pesticides in 12 crops (asparagus, cauliflower, burdock, carrot, broccoli, spinach, matsutake mushroom, orange, soybean, sesame, millet and tea) was done ...

Elevation of glucocorticoid (GC) hormone levels is an integral part of stress response (as well as its termination) and immunomodulation. These hormones are also responsible for mobilizing energy stores by stimulation of gluconeogenesis and inhibition of protein synthesis. Elevation of GCs is thus incompatible with other protein-demanding processes, such as moult. Previous studies have shown th...

Successful application of the Hadamard transform (HT) technique to gas chromatography/mass spectrometry (GC/MS) and liquid chromatography/mass spectrometry (LC/MS) is described. Novel sample injection devices were developed to achieve multiple sample injections in both GC and LC instruments. Air pressure was controlled by an electromagnetic valve in GC, while a syringe pump and Tee connector we...

use by the OPCW inspectorate. Use of GC with one or more spectrometric technique such as mass spectrometry is required to conRrm the presence of chemical warfare agents. For this reason many analyses are carried out by GC-MS under electron impact or chemical ionization conditions. For analyses involving low levels of chemical warfare agents in the presence of high levels of interfering chemical...

A young man (22 years old) died of a cardiorespiratory arrest a few hours following admission to the emergency department of a hospital. He was found lying seriously ill in the parking lot of a dance club. Screening of postmortem blood and urine with enzyme multiplied immunoassay (EMIT) detected only amphetamines, caffeine, and cotinine. Further screening of blood, urine, and stomach contents w...

A range of different analytical techniques were used to test recycled polyethylene terephthalate (PET) flakes for potential chemical contaminants. The techniques used were headspace gas chromatography coupled to mass spectrometry (GC-MS), liquid extraction followed by GC-MS, supercritical-fluid extraction followed by GC-MS, and migration testing followed by elemental analysis using inductively ...