| 词汇 | covalent-bond |
| 释义 | covalent bond noun[ C ] chemistry specializeduk /kəʊˌveɪ.lənt ˈbɒnd/ us /koʊˌveɪ.lənt ˈbɑːnd/ a chemical bond in which two atoms share one or more pairs of electrons that hold them together: 共价键（原子间共享电子而形成的化学键） These solids have very high melting points because their atoms are linked together with strong covalent bonds. Carbon and silicon exist as giant molecular structures held together by single covalent bonds. Related word covalently A single covalent bond is represented by a single line between the atoms. In ceramics, the electrons are firmly held in strong covalent bonds and are not available for reaction. A shared pair of electrons is called a single covalent bond, or a bond pair. Cells actin anaphase anti-platelet assort axoplasm histochemistry histography homologous chromosomes infiltration intercellular neoplasia nerve fibre neurofibril neurofibrillary neuroglia teratoma tetrad thrombocyte thymocyte turgor covalent bond | American Dictionarycovalent bond noun[ C ] us/koʊˈveɪ·lənt ˈbɑnd/ a chemical bond in which two atoms share one or more pairs of electrons, which hold them together Examples of covalent bondcovalent bond This structure is unique in enzymes in that the two ends are the only form of covalentbond attachment to rest of the protein. Thereafter, b-ionone freely exchanged within the binding pocket during perfusion because the truncated retinoid cannot form a covalentbond with opsin. The mechanism of the attractive force in a covalentbond relies on highly complex electromagnetic interactions between electrons with magnetic spin components. This is of course equivalent to saying that as a covalentbond begins to form between the phosphorus and the 2h-oxygen, the burden of the negative charge becomes relieved. This type of chemical bond is either a non-polar covalentbond or a polar covalentbond. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. As such, the chemical linkage (usually a covalentbond) should be subjectable to biodegradation, such as hydrolysis, by an enzymatic or non-enzymatic mechanism. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. What makes the isopeptag different from other peptide tags is that it can bind its binding protein through a permanent and irreversible covalentbond. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. If the unpaired electrons can spin-pair to form a covalentbond, then the covalent bonding interaction can lower the energy of the charge transfer state. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. They are not full charges because the electrons are still shared through a covalentbond between the oxygen and carbon. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. While traditional chemistry focuses on the covalentbond, supramolecular chemistry examines the weaker and reversible noncovalent interactions between molecules. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This new peptide tag can allow scientists to target and isolate their proteins of interest through a permanent covalentbond. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These products incorporate a unique synthetic bioadhesive that forms a covalentbond with tissue proteins enabling adhesion to internal organs and achieving a sealing effect. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Photochemical routes to oxyallyl cations generally result in the formation of a new covalentbond before the cycloaddition itself takes place. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Secondly, since there is no covalentbond, various indicators can be used with the same receptor. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. To uncage molecules, a photolysis system is required to cleave the covalentbond. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. See all examples of covalent 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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