| 词汇 | gas-chromatography |
| 释义 | BETA gas chromatographycollocation in Englishmeanings of gasand chromatographyThese words are often used together. Click on the links below to explore the meanings. gas noun uk /ɡæs/ us /ɡæs/ a substance in a form like air that is neither solid ... See more at gas chromatography noun[ U ] uk /ˌkrəʊ.məˈtɒɡ.rə.fi/ us /ˌkroʊ.məˈtɑː.ɡrə.fi/ a scientific method of finding what separate chemicals are in a substance by passing it through a material such ... See more at chromatography Examples of gas chromatographygas chromatography The chemical composition of the headspace volatiles from healthy and fourth instar larvae-infested cowpea seeds were identified, characterized, and compared using gaschromatography-mass spectrometry. We are in the process of standardizing the technique to measure ethanol levels in blood using gaschromatography, with promising results. The resultant gas fragments were separated by gaschromatography and identified by mass spectrometry. A gaschromatography syringe was used to obviate the problem of schistosomula lodging in the syringe barrel. Residues were dried, derivatized and analysed for fagopyritols or other soluble carbohydrate products by high-resolution gaschromatography, as described above. Wardhaugh et al. (1998) used gaschromatography to detect deltamethrin residues directly. A positive screen was defined as a positive enzyme multiple immunoassay test followed by positive gaschromatography/mass spectroscopy. A volume of 0.1 ml of solution from each scintillation vial was placed into 0.8 ml flat bottom gaschromatography vials. Known amounts of the gas (as measured by gaschromatography, see below) were injected into the flasks through the rubber caps with a syringe. Periodically, gas samples were collected and analysed via gaschromatography. It was perhaps surprising that no one from the workshop had yet tried truly field-portable gaschromatography equipment. Gaschromatography was employed for the initial optimization of the extraction, purification and analysis of the mosquito cuticular hydrocarbons and for their quantitative analysis. In the ' ruboff experiments ', samples of control and experimental females were subject to gas chromatography to determine the alteration in hydrocarbon profile induced by these experiments. The resulting extracts were analysed by gaschromatography on packed columns to quantify amounts of the pheromone components remaining and on capillary columns to determine isomeric purity. The active compound was recovered using dichloromethane, yielding the target compound (99% purity), which was characterized using gaschromatography -mass spectrometry, infrared spectroscopy, and nuclear magnetic resonance spectroscopy. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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