| 词汇 | acetone |
| 释义 | acetone noun[ U ] uk /ˈæs.ə.təʊn/ us /ˈæs.ə.t̬oʊn/ a strong-smelling, clear liquid that is used in the production of various chemicals and is sometimes added to paint to make it more liquid丙酮 Chemicals, chemical compounds & gases acetic acid acrolein acrylamide activated charcoal adenine agglomerate cyanide ethyl alcohol glyphosate H2O HCFC HFC hyaluronic acid hydrochloric acid laughing gas limescale meths oxyacetylene prussic acid tartaric acid Examples of acetoneacetone The ethanol is placed in the indoor lower corridor and the acetone in the upper corridor. Only two odour filters are used, acetone and ethanol. They were washed in several changes of deionized water and dehydrated in an ascending series of acetone concentrations. For these calves, production rates of acetone and butanone were similar to those from an ox (fig. 4). For each replicate, a filter paper was impregnated with 1 ml of insecticide dissolved in acetone. Other freshly-fixed specimens and some of the cryo-specimens were dehydrated in acetone and soaked in amyl acetate. The plants were separated into their parts and macerated with different solvents (n-hexane, acetone, ethanol and methanol). Comparisons of freeze substitution using acetone, ethanol or methanol, showed similar morphological appearance. After the acid leaching, the samples were washed twice with standard acetone, centrifuged and dried. The slides were then dried overnight, dehydrated in a series of alcohols and acetone, and rinsed in xylene before being coverslipped. Due to the small amount of material available, only 15 aliquots of the sample could be prepared by settling in acetone on aluminum discs. The acetone from the crude extracts was removed by evaporation under a stream of nitrogen and dry residues were dissolved in 100% (v/v) acetonitrile. Monolayers were fixed with 75 % acetone after 1-2 days of incubation. Control papers were treated with 0.15 ml acetone. A control experiment showed that the residual acetone had no effect on grain germination. 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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