covalent

简明释义

英[ˌkəʊˈveɪlənt]美[ˌkəʊˈveɪlənt]

adj. 共价的；共有原子价的

英英释义

单词用法

同义词

反义词

例句

1.Like similar covalent fluorides and perchlorates, it needs to be handled with extreme caution.

就像与其类似的共价氟化物和高氯酸盐，都需要非常谨慎处理。

2.Antibody can be linked to liposome particles by covalent binding.

抗体能通过共价键结合在脂质体颗粒上。

3.He's famous for a lot of things, one of which is covalent bonding.

他有许多著名的发现，其中一个便是共价键。

4.This is purely covalent because all it is is homonuclear bond energies.

是一个完全的共价成分，他的理由是他们都是同核共价。

5.Both ionic and covalent bonds arise from the tendency of atoms to attain this stable configuration of electrons.

离子键和共价键都是由于原子要达到这个稳定电子构型而形成的。

6.This bonding may be hydrogen bonding but is preferably a salt bond and especially a covalent bond.

这可能是结合氢键，但最好是盐的债券，特别是共价键。

7.In this paper, we give a experiential calculating formula of atomic covalent radius, the results are satisfied.

本文给出了一个计算原子共价半径的经验公式，其计算结果与实验值基本相符。

8.And the key word for covalent bonds is the idea of being Shared.

而关于共价键最关键的一点就在于共用的概念。

9.Naturally occurring covalent crosslinks play an important role in the structure-function relationships of proteins.

通常地，出现的共价交联在蛋白的结构和功能关系中起重要作用。

10.When two atoms share electrons equally, they form a nonpolar covalent 共价 bond.

当两个原子平等共享电子时，它们形成一个非极性共价 共价 键。

11.The covalent 共价 bond between carbon and hydrogen is fundamental to organic compounds.

碳和氢之间的共价 共价 键是有机化合物的基础。

12.Water molecules are formed by two hydrogen atoms sharing electrons with one oxygen atom through covalent 共价 bonds.

水分子是由两个氢原子与一个氧原子通过共价 共价 键共享电子形成的。

13.In organic chemistry, the structure of a molecule is often determined by its covalent 共价 bonds.

在有机化学中，分子的结构通常由其共价 共价 键决定。

14.The DNA double helix is stabilized by covalent 共价 bonds between the sugar and phosphate backbone.

DNA双螺旋通过糖和磷酸骨架之间的共价 共价 键得到稳定。

作文

Covalent bonds are fundamental to the structure and function of all living organisms. A covalent bond is formed when two atoms share one or more pairs of electrons. This sharing allows each atom to attain the electron configuration of a noble gas, which is often associated with chemical stability. For example, in a water molecule (H2O), each hydrogen atom forms a covalent bond with the oxygen atom by sharing electrons. The ability of atoms to form covalent bonds is crucial for the creation of complex molecules such as proteins, carbohydrates, and nucleic acids, which are essential for life.Understanding covalent bonds is key to grasping how molecules interact in biological systems. These bonds can vary in strength; single, double, and triple covalent bonds exist, depending on the number of shared electron pairs. For instance, in molecular oxygen (O2), the two oxygen atoms are connected by a double covalent bond, sharing two pairs of electrons. This strong interaction not only affects the properties of the molecule but also influences how it reacts with other substances.In addition to their role in forming stable structures, covalent bonds also contribute to the unique properties of water. Water's polarity, resulting from the unequal sharing of electrons between hydrogen and oxygen, leads to hydrogen bonding, which is vital for many biological processes. The covalent bonds in water molecules enable it to dissolve various substances, making it an excellent solvent for biochemical reactions.Moreover, the concept of covalent bonding extends beyond simple molecules. In larger biological macromolecules, such as DNA, covalent bonds play a critical role in maintaining the integrity of genetic information. The sugar-phosphate backbone of DNA is formed by covalent bonds that link nucleotides together, ensuring the stability of the genetic code.The study of covalent bonds also has implications in fields such as materials science and pharmacology. For example, understanding how covalent bonds can be manipulated allows scientists to design new drugs that can target specific biological pathways. By creating compounds that can form covalent bonds with certain proteins, researchers can develop therapies that are more effective and have fewer side effects.In conclusion, covalent bonds are not merely a topic of academic interest; they are essential to the very fabric of life. From the simplest molecules to the most complex biological systems, the nature of covalent bonding shapes our understanding of chemistry and biology. As we continue to explore the intricacies of these bonds, we unlock new possibilities for innovation in science and medicine.

共价键是所有生物体结构和功能的基础。共价键是在两个原子共享一个或多个电子对时形成的。这种共享使得每个原子能够获得贵气体的电子配置，这通常与化学稳定性相关。例如，在水分子（H2O）中，每个氢原子通过共享电子与氧原子形成共价键。原子形成共价键的能力对于复杂分子的创建至关重要，如蛋白质、碳水化合物和核酸，这些都是生命所必需的。理解共价键是掌握分子在生物系统中如何相互作用的关键。这些键的强度可以有所不同；单、双和三重共价键存在，具体取决于共享的电子对数量。例如，在分子氧（O2）中，两个氧原子通过双共价键连接，共享两对电子。这种强相互作用不仅影响分子的性质，还影响它与其他物质的反应。除了在形成稳定结构中的作用外，共价键还对水的独特性质做出了贡献。水的极性源于氢和氧之间不等的电子共享，导致氢键的形成，这对许多生物过程至关重要。水分子中的共价键使其能够溶解各种物质，使其成为生化反应的优秀溶剂。此外，共价键的概念超越了简单分子。在更大的生物大分子中，例如DNA，共价键在维持遗传信息的完整性方面发挥着关键作用。DNA的糖-磷酸骨架是由共价键连接核苷酸而形成的，确保遗传密码的稳定性。对共价键的研究在材料科学和药理学等领域也具有重要意义。例如，理解如何操控共价键使科学家能够设计新的药物，能够靶向特定的生物通路。通过创建能够与某些蛋白质形成共价键的化合物，研究人员可以开发出更有效且副作用更少的疗法。总之，共价键不仅仅是一个学术兴趣的话题；它们是生命本质的基础。从最简单的分子到最复杂的生物系统，共价键的性质塑造了我们对化学和生物学的理解。随着我们继续探索这些键的复杂性，我们为科学和医学的创新开启了新的可能性。