Covalent Attachment
Covalent Attachment - Related Videos
10:37
Covalent Attachment of Single Molecules for AFM-based Force Spectroscopy
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Cited by 3 •
2020
Covalent attachment of probe molecules to atomic force microscopy (AFM) cantilever tips is an essential technique for the investigation of their physical properties. This allows us to determine the stretching force, desorption force and length of polymers via AFM-based single molecule force spectroscopy with high reproducibility.
02:18
Network Covalent Solids
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2020
Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds. To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
02:04
Covalently Linked Protein Regulators
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2020
Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified. These groups modify specific amino acids in a protein.
02:46
Covalent Bonding and Lewis Structures
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2020
Compared to ionic bonds, which results from the transfer of electrons between metallic and nonmetallic atoms, covalent bonds result from the mutual attraction of atoms for a “shared” pair of electrons. Covalent bonds are formed between two atoms when both have similar tendencies to attract electrons to themselves (i.e., when both atoms have identical or fairly similar ionization energies and electron affinities). Physical Properties of Covalent Compounds Compounds that contain covalent...
01:20
Attachment
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2025
Attachment is vital for infant development, as warm social interactions support growth and well-being. In a classic 1958 study by Harry Harlow, the significance of warmth and comfort in forming attachments was examined. Harlow separated newborn monkeys from their mothers and provided two artificial "mothers": one made of cold wire and the other covered in soft cloth. Despite the wire mother offering food, the infant monkeys preferred the comfort of the cloth mother, demonstrating that physical...
FAQs
The reaction depends on matching chemically reactive groups on the components being joined. Amines, thiols, carboxyls, and activated esters can participate in these reactions, allowing two biomolecular components to form a covalent connection. Because the atoms share electron pairs in the resulting bond, the joined components remain connected as a stable molecular or surface-associated construct.
These functional groups provide chemically distinct points for joining biomolecules or other components. Their complementary reactivity helps researchers connect selected partners rather than relying on nonspecific association. Choosing an appropriate group supports applications such as protein modification, DNA or lipid conjugation, fluorescent labeling, and immobilization, while preserving the intended organization of the resulting biological construct.
A covalent connection can integrate an added chemical or biomolecular component into a protein, DNA molecule, lipid, or related structure. This enables researchers to alter how a molecule is tracked, positioned, or used in an experiment. The stable connection is particularly valuable when a modification must remain associated with its biological target during molecular studies or device development.
A practical design begins by identifying the biomolecule or surface that will receive the attachment, the component to be added, and the functional groups available on each partner. Researchers then select a compatible pairing, such as an amine with a complementary activated ester or another supported reactive group. This planning determines whether the intended protein, DNA, lipid, or surface construct can be produced.
Fluorescent labeling uses a covalent connection to associate a fluorescent component with a biomolecule. Once attached, the label provides a way to track the selected cellular or molecular component in research. This approach can help investigators study where a target is located or examine molecular interactions, while the stable linkage helps maintain the relationship between the label and its target.
Immobilizing biomolecules on laboratory surfaces creates organized interfaces for investigating molecular interactions and engineering biosensors. Covalent attachment also supports the construction of conjugates involving DNA, lipids, or other biological components. In drug-delivery research, these stable connections can contribute to targeted systems by linking relevant molecular components in a defined biological design.