| 词汇 | amide |
| 释义 | amide noun[ C ] uk /ˈæm.aɪd/ us /ˈæm.aɪd/ a substance formed from ammonia by replacing a hydrogen atom with a metal酰胺;氨化物 Chemicals, chemical compounds & gases acetic acid acetone acrolein acrylamide activated charcoal adenine agglomerate ethyl alcohol H2O HCFC HFC hyaluronic acid hydrochloric acid hydrochlorofluorocarbon laughing gas limescale metho meths oxyacetylene tartaric acid It may be remembered that yeast assimilates nitrogenous compounds in some of their simpler forms—amides and the like. amide | American Dictionaryamide noun[ C ] us/ˈæm·ɑɪd, ˈæm·əd/ chemistry a substance formed from ammonia by replacing a hydrogen atom with a metal Examples of amideamide About 30 % of the amide protons exchanged with deuterons after 3 hours. The interactions are strongest when the interacting amide groups vibrate with the same frequency. A final example are the amide groups of the protein backbone. Moreover, the crystal structures reveal networks of hydrogen bonds among amide groups of glutamine and asparagine side-chains. A protected amide hydrogen can be regarded as ' closed ' to exchange. The next system on the energy scale is an amide ester. It depends, however, on the secondary structure of the backbone and is therefore the amide vibration that is most commonly used for secondary-structure analysis. About 50-60 % of the amide hydrogens could be exchanged with deuteriums within 24 hours. The amount of exchangeable amide protons can vary with a broad range. The resulting amide group is as short as the ethynyl group, but the conformational degree of freedom is larger and coupling yields are very low. The contribution of internal coordinates to these normal modes will generally alter when the amide group is incorporated into a polypeptide. Intensities and other spectral parameters of infrared amide bands of polypeptides in the - and random forms. The conformational sensitivity of the amide vibrations has long been used to assess the secondary structure of proteins in general, and membrane proteins in particular. Binding of the co-factor makes the holorepressor more stable as evidenced by slower amide exchange rates. Combined ab initio and free energy calculations to study reactions in enzymes and solution : amide hydrolysis in trypsin and aqueous solution. 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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