Molecular Length
Molecular Length - Related Videos
09:55
Molecular Cloning
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2023
Molecular cloning is a set of methods, which are used to insert recombinant DNA into a vector - a carrier of DNA molecules that will replicate recombinant DNA fragments in host organisms. The DNA fragment, which may be a gene, can be isolated from a prokaryotic or eukaryotic specimen. Following isolation of the fragment of interest, or insert, both the vector and insert must be cut with restriction enzymes and purified. The purified pieces are joined together though a technique called...
12:02
Molecular Evolution of the Tre Recombinase
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Cited by 4 •
2008
Here we report the generation of Tre recombinase through directed, molecular evolution. Tre recombinase recognizes a pre-defined target sequence within the LTR sequences of the HIV-1 provirus, resulting in the excision and eradication of the provirus from infected human cells. While still in its infancy, directed molecular evolution will allow the creation of custom enzymes that will serve as tools of molecular surgery and molecular medicine.
02:00
Molecular Models
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2020
Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules. Skeletal Model Simpler two-dimensional representations of chemical compounds are accomplished using skeletal models. The illustration shows only the molecular framework or bonds without explicitly showing the atoms. In this representation, many of the carbon atoms...
06:54
MR Molecular Imaging of Prostate Cancer with a Small Molecular CLT1 Peptide Targeted Contrast Agent
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Cited by 3 •
2013
To demonstrate MR cancer molecular imaging with a small peptide targeted MRI contrast agent specific to clotted plasma proteins in tumor stroma in a mouse prostate cancer model.
03:51
Molecular Orbital Theory II
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2020
Molecular Orbital Energy Diagrams The relative energy levels of atomic and molecular orbitals are typically shown in a molecular orbital diagram. For a diatomic molecule, the atomic orbitals of one atom are shown on the left, and those of the other atom are shown on the right. Each horizontal line represents one orbital that can hold two electrons. The molecular orbitals formed by the combination of the atomic orbitals are shown in the center. Dashed lines show which of the atomic orbitals...
FAQs
Contour length represents the full path along a molecular chain, whereas end-to-end distance describes the separation between its two endpoints. A flexible chain can have a substantial contour length but a much smaller end-to-end distance when it folds into a compact coil. Comparing both measures helps distinguish total chain size from its configuration in a particular environment.
Persistence length indicates how strongly a molecular chain resists bending over distance. When the persistence length is large relative to the chain, the structure behaves more like a mechanically constrained segment; when it is smaller, flexibility allows coiling and compaction. This distinction helps explain differences in folding, motion, mechanical response, and interactions in engineered biomolecular systems.
Solvent conditions can alter molecular interactions and therefore the dimensions a chain appears to occupy. Changes in those interactions may favor a compact coil, an extended chain, or another constrained configuration without changing the molecule’s full contour length. Accounting for the surrounding solvent is essential when relating measured dimensions to transport, folding, or material performance.
Molecular length affects how chains organize, move, and bear or transmit mechanical forces. In protein-based materials and hydrogels, chain dimensions can therefore influence mechanical performance and transport through the material. Treating length together with flexibility and molecular interactions gives designers a more useful basis for connecting molecular architecture with the behavior of the finished system.
Researchers should distinguish the molecule’s contour length from its end-to-end distance and consider whether flexibility or mechanical constraints change the relationship between them. Measurements also need interpretation under the relevant solvent conditions, because interactions can modify effective dimensions. This comparison provides a clearer description of molecular architecture than relying on a single length value alone.
Length can be controlled as part of molecular architecture to influence how DNA constructs or nanoscale devices occupy space, interact, and function. Designers can evaluate whether a structure should remain relatively extended, form a compact configuration, or operate under mechanical constraint. These choices connect nanoscale dimensions with intended transport, interaction, and device behavior.
In drug-delivery systems and hydrogels, molecular dimensions contribute to how structures organize and how substances move through them. Length must be considered alongside solvent-dependent interactions and chain flexibility, since these factors can change effective dimensions and transport behavior. Characterizing and controlling molecular length therefore supports the design of systems with targeted structural and functional properties.