supercoil การใช้

• A plasmid is tightly wound into a negative supercoil ( a ).
• The noun form " supercoil " is often used in the context of DNA topology.
• Nuclear DNA is a double helix, thought to resemble a twisted ladder that can supercoil, folding itself over and over.
• Nuclear DNA is a double helix, thought to resemble a twisted ladder that can supercoil, folding itself over and over/
• It does this by cutting the DNA strands, allowing it to rotate and release the supercoil, and then rejoining the strands.
• Coiled-coil ? helices are highly stable forms in which two or more helices wrap around each other in a " supercoil " structure.
• DNA gyrase is an important enzyme that introduces a negative supercoil to the DNA and is responsible for the biological processes in DNA replication and transcription.
• Fibrous keratin molecules supercoil to form a very stable, left-handed superhelical motif to multimerise, forming filaments consisting of multiple copies of the keratin monomer.
• The simple figure eight is the simplest supercoil, and is the shape a circular DNA assumes to accommodate one too many or one too few helical twists.
• After introducing a nick in the system, the negative supercoil gradually unwinds ( c ) until it reaches its final, circular, plasmid state ( d ).
• As helicase unwinds the double helix, topological changes induced by the rotational motion of the helicase lead to supercoil formation ahead of the helicase ( similar to what happens when you twist a piece of thread ).
• For the DNA applications, see Writhe # Applications _ in _ DNA _ topology and DNA _ supercoil, or check out the work of Craig Benham if you want to see some of the detailed math . talk ) 16 : 09, 27 March 2014 ( UTC)
• For example, the researchers identified a specific sequence of DNA that regulates transcription speed; as the amount of supercoil rises and falls, it slows or speeds the pace at which molecular machinery reads DNA . It is hypothesized that these structural changes might trigger stress elsewhere along its length, which in turn might provide trigger points for replication or gene expression.