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请教如何计算引物的Tm值?

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请教如何计算引物的Tm值?
最好能给出计算公式等.
请教如何计算引物的Tm值?
博凌科为-为你先看一下Tm的定义:Tm = Temperature at which 50% of a given oligonucleotide is hybridized to its complementary strand.In the absence of destabilizing agents,like formamide or urea,Tm will depend on 3 major parameters:The sequence:a GC-rich sequence has a higher melting temperature.The strand concentration:high oligonucleotide concentrations favor hybrid formation,which results in a higher melting temperature.The salt concentration:high ionic strength results in a higher Tm as cations stabilize the DNA duplexes.引物设计软件都可以给出Tm,引物长度,碱基组成,引物使用缓冲的离子强度有关.长度为25mer以下的引物,Tm计算公式为:Tm = 4℃(G + C)+ 2℃(A + T)对于更长的寡聚核苷酸,Tm计算公式为:Tm = 81.5 + 16.6 x Log10[Na+] + 0.41 (%GC) 600/size公式中,Size = 引物长度.