单词 | closed-ring |
例句 | They all show mutarotation and exist in two modifications, indicating that the component groups have the closed-ring arrangement. The Chemistry of Plant Life These are a group of strong vegetable bases whose nitrogen atom is a part of a closed-ring arrangement. The Chemistry of Plant Life Nothing is known, however, of the process by which the more complicated closed-ring amino-acid compounds, such as proline, histidine, or tryptophane, are synthetized. The Chemistry of Plant Life Some investigators are inclined to be that sugars actually exist in the open-chain arrangement when in aqueous solution, and in the closed-ring arrangement when in alcoholic solution. The Chemistry of Plant Life The lignin material generally consists of two types of substances, one of which contains a closed-ring nucleus of unknown composition and the other is probably a pentosan. The Chemistry of Plant Life The oxygenated essential oils may be either alcohols, aldehydes, ketones, acids, esters, or phenols, derived from either five-membered or six-membered closed-ring hydrocarbons. The Chemistry of Plant Life The alkaloids are conveniently divided into groups, according to the characteristic closed-ring arrangements which they contain. The Chemistry of Plant Life |
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