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What is melting temperature of DNA? Define denaturation and renaturation?

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Denaturing/Renaturing a protein refers to a changing its conformation with respect to the "native conformation" of the protein (the one that exists en vivo). These conformational shifts can be induced by changing the salt concentration of the solution, adding/removing reagents or surfractants like SDS...
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Denaturing/Renaturing a protein refers to a changing its conformation with respect to the "native conformation" of the protein (the one that exists en vivo). These conformational shifts can be induced by changing the salt concentration of the solution, adding/removing reagents or surfractants like SDS or urea, or by heat. Just think, which one (denaturation or renaturation) refers to changing the protein's conformation away from its native state? -Hint: denaturation sometimes involves the breaking of disulfide bonds where Cys residues are present. read less
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(Tm) the melting temperature is the temperature at which one-half of a particular DNA duplex which disassociate to single stranded DNA. Tm varies from species to species. Denaturation - formation of single stranded DNA from double stranded helix by heating. Renaturation - it is a process of formation...
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(Tm) the melting temperature is the temperature at which one-half of a particular DNA duplex which disassociate to single stranded DNA. Tm varies from species to species. Denaturation - formation of single stranded DNA from double stranded helix by heating. Renaturation - it is a process of formation of double stranded DNA from single stranded DNA by cooling. The concentration of DNA detected by measuring UV absorbanc at 260nm. read less
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Curriculam vitae

The melting temperature of DNA is called as Tm. The Tm is defined as the temperature in degrees Celsius, at which 50% of all molecules of a given DNA sequence are hybridized into a double strand, and 50% are present as single strands.
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Biologist

DNA denaturation, also called DNA melting denoted by Tm. The Tm is defined as the temperature in degress Celsius, at which 50% of all molecules of a given DNA sequence are hybridized into a double strand, and 50% are present as single strands. By using this formula you can calculate DNA melting temperature: ...
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DNA denaturation, also called DNA melting denoted by Tm. The Tm is defined as the temperature in degress Celsius, at which 50% of all molecules of a given DNA sequence are hybridized into a double strand, and 50% are present as single strands. By using this formula you can calculate DNA melting temperature: Tm = {2 (A+T) + 4 (G+C)} This takes into account that the G-C bond is stronger than the A-T bond. Note that the 2+4 rule is valid for a small length range only, about 20-40 nt. It is very easy to compute, but is of course very inaccurate. Where possible, it should be avoided. Denaturation: The process of formation of single stranded DNA from double stranded helical DNA upon heating that leads to breaking of hydrogen bonds between base pairs. Renaturation: The process of formation of double stranded DNA (reannealing) from single stranded DNA upon cooling. read less
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Melting point of DNA is related to the GC content of it. Since GC forms three hydrogen bonds, while AT forms two hydrogen bonds, the more GC you have in your DNA the higher the melting point will be. If the GC content is about 50%, the melting point is around 50C. The exact number is hard to calculate...
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Melting point of DNA is related to the GC content of it. Since GC forms three hydrogen bonds, while AT forms two hydrogen bonds, the more GC you have in your DNA the higher the melting point will be. If the GC content is about 50%, the melting point is around 50C. The exact number is hard to calculate and there really isn't a universally accepted way of calculating melting temp base on the sequence. Denaturation is a process of formation of single stranded DNA from double stranded helical DNA upon heating. Renaturation is a process of formation of double stranded DNA or reannealing from single stranded DNA upon cooling. read less
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DNA melting temperature is the temperature in degress Celsius, at which 50% of all molecules of a given DNA sequence are hybridized into a double strand, and 50% are present as single strands. And important point to understand here is, ‘melting’ in this sense is not a change of aggregate state, but...
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DNA melting temperature is the temperature in degress Celsius, at which 50% of all molecules of a given DNA sequence are hybridized into a double strand, and 50% are present as single strands. And important point to understand here is, ‘melting’ in this sense is not a change of aggregate state, but simply the dissociation of the two molecules of the DNA double helix. Factors which affect Tm are like, 1. Concentration of DNA 2. Concentration of ions in the solution, most notably Mg+ and K+ 3. DNA sequence 4. Length of DNA 50% GC always will not 50C, would be more than that, some time 70C also. Formulas used to calculate Tm are 2+4 rule of thumb (2* Number of AT + 4* Number of GC) its crude method used to estimate Tm of Primer with a max length of 40 nt, but its not accurate Linear regression method : Tm = 81.5 + 16.6(log10([Na+])) + .41*(%GC) – 600/length Here [Na+] is the molar sodium concentration, (%GC) is the GC ratio, and length is the length of the sequence. More well accepted method is, Nearest neighbour method which takes into account both the enthalpy of the pair formation between two nucleotides as well as the stacking effect between nearest neighboured nucleotide pairs. read less
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Denaturation is a process in which proteins or nucleic acids lose their tertiary structure and secondary structure by application of some external stress The original structure of a protein is a three-dimensional structure. The process of returning a denatured protein structure to its original structure...
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Denaturation is a process in which proteins or nucleic acids lose their tertiary structure and secondary structure by application of some external stress The original structure of a protein is a three-dimensional structure. The process of returning a denatured protein structure to its original structure and normal level of biological activity is renaturation read less
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Melting point of DNA is related to the GC content of it. Since GC forms three hydrogen bonds, while AT forms two hydrogen bonds, the more GC you have in your DNA the higher the melting point will be. If the GC content is about 50%, the melting point is around 50C.
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The melting temperature of DNA is called as Tm. The Tm is defined as the temperature in degrees Celsius, at which 50% of all molecules of a given DNA sequence are hybridized into a double strand, and 50% are present as single strands.
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