| 词汇 | hydrogen-bond |
| 释义 | hydrogen bond noun[ C ] chemistry specializeduk /ˈhaɪ.drɪ.dʒən ˌbɒnd/ us /ˈhaɪ.drɪ.dʒən ˌbɑːnd/ a weak connection that is formed between an atom of hydrogen and an atom of another substance such as oxygen or nitrogen氢键 Chemistry - general words acceptor aerosol aerosolize allotrope amphiprotic balanced equation chemical equation electrolyte endocrine disruptor endothermic epitaxial epitaxially epitaxy inorganic chemistry ionic bond nonelectrolyte nonreactive preatomic reactive reactivity hydrogen bond | American Dictionaryhydrogen bond noun[ C ] us/ˈhɑɪ·drə·dʒən ˈbɑnd/ science a weak connection that is formed between an atom of hydrogen (= a gas) and an atom of another substance such as oxygen or nitrogen (= a gas) Examples of hydrogen bondhydrogen bond One of the aspartates that formerly interacted with the tyrosine now forms a hydrogenbond with a conserved histidine. None of the sulfide ions make any favorable hydrogenbond to the protein. Its frequency depends on the strength of the hydrogenbond. The reason for this is easily understood since ammonia forms a hydrogenbond that imidazole (or histidine) cannot form. Furthermore, simulated annealing does not provide well-defined conformations, but the different conformations that are observed are consistent with several possible hydrogenbond combinations. The transition is opposed by the loss in conformational entropy, and driven by gains in free energy due to hydrophobic burial and hydrogenbond formation. The environment of the iron-sulfur cluster is not exceptional having, on average, one hydrogenbond per liganding cysteine and otherwise a surrounding hydrophobic environment. Note the hydrogenbond between the exocyclic amine of the 3h cytosine base and the non-bridging oxygen of the phosphate at the exchange point. Unlike the alcohols, general anaesthetics cannot hydrogenbond to phospholipid headgroups. The second condition ensures that the hydrogenbond is more or less linear. The second distance restraint restricts the angle of the hydrogenbond. To represent the key feature of a polar solvent like water, the capability of hydrogenbond formation has to be represented. Formally, the hydrogenbond has to be treated as a combination of a dipole-dipole interaction and a charge transfer reaction. The relation should be particularly useful in studies of enzyme catalytic sites or other protein-ligand interactions in which hydrogenbond strength may play a key role. Correlation with hydrogenbond length. See all examples of hydrogen bond 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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