Solenoid Model
Solenoid Model - Related Videos
01:18
Solenoids
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2026
A solenoid is a conducting wire coated with an insulating material, wound tightly in the form of a helical coil. The magnetic field for a solenoid is the vector sum of the magnetic field due to its individual turns. For an ideal solenoid, the magnetic field inside is almost uniform and parallel to the solenoid axis, while the magnetic field outside the solenoid is nearly zero. Each turn in a solenoid can be approximated as a circular current carrying coil that generates a dipole moment. The...
01:18
Magnetic Field of a Solenoid
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2026
A solenoid is a conducting wire coated with an insulating material, wound tightly in the form of a helical coil. The magnetic field due to a solenoid is the vector sum of the magnetic fields due to its individual turns. Therefore, for an ideal solenoid, the magnetic field within the solenoid is directly proportional to the number of turns per unit length and the current. Conversely, the magnetic field outside the solenoid is zero. Consider a solenoid with 100 turns wrapped around a cylinder of...
12:31
In Vivo Modeling of the Morbid Human Genome using Danio rerio
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Cited by 66 •
2013
Here, we present a systematic approach for developing physiologically relevant, sensitive and specific in vivo assays for interpreting variation in human pathology. Transient genetic manipulation via microinjection of WT and mutant human mRNA and morpholino (MO) antisense oligonucleotides harness the tractability of the developing zebrafish embryo to rapidly assay pathogenic mutations, especially, but not exclusively, in the context of human developmental disorders.
06:09
Assessing Spatial Memory Impairment in a Mouse Model of Traumatic Brain Injury Using a Radial Water Tread Maze
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Cited by 1 •
2017
Here we present a protocol for a mouse-specific test of cognition that does not require swimming. This test can be used to successfully distinguish controlled cortical impact-induced traumatic brain injury mice from sham controls.
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...
FAQs
Linker DNA connects neighboring nucleosomes, while histone H1 helps stabilize their interactions as the chromatin fiber folds. Together, these components support a more compact and organized arrangement than nucleosomes alone would provide. Their proposed contribution is important because the model links specific structural features of chromatin to the efficient packaging of DNA inside the nucleus.
The estimate of roughly six nucleosomes in each helical turn gives the solenoid model a defined geometric framework rather than describing compaction only in general terms. It helps illustrate how repeated nucleosome units could produce a regular fiber and provides a basis for discussing higher-order chromosome organization, while not proving that every chromatin region adopts this exact arrangement.
A tightly folded fiber would make some DNA regions less physically accessible than DNA arranged in a more open configuration. This creates a structural connection between chromatin compaction and gene regulation, because the model helps explain how packaging may influence whether cellular machinery can reach particular genetic regions. It therefore links chromosome structure with functional control of genetic information.
The Solenoid Model presents chromatin as a relatively regular helical fiber, making it useful for introducing ordered genome packaging. Newer evidence indicates that chromatin can adopt more varied arrangements, so the classic model should be treated as a conceptual framework rather than a complete description of all chromatin. This comparison highlights the difference between a simplified teaching model and structural diversity.
A useful conceptual workflow is to identify nucleosomes as repeating DNA-histone units, consider how linker DNA and histone H1 connect them, and then examine the resulting helical compaction. The proposed six-nucleosome turn can serve as a reference for discussing organization. From there, analysis can address consequences for DNA accessibility, regulation, replication, and chromosome structure.
The model provides a way to relate physical packaging to several biological processes, including gene regulation, DNA replication, and chromosome organization. Its value lies in showing that DNA structure is not separate from function: the degree and arrangement of compaction can be discussed alongside the accessibility and management of genetic material within the cell nucleus.
Its continuing value comes from its ability to organize foundational ideas about nucleosomes, histone-mediated interactions, helical folding, and genome packaging in one understandable framework. Although chromatin may be more structurally varied than the classic model proposes, the model remains useful for introducing how DNA compaction can influence accessibility, regulation, replication, and chromosome organization.