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Spectral analysis of high resolution direct-derivative melting curves of DNA for instantaneous and total base composition

, : Spectral analysis of high resolution direct-derivative melting curves of DNA for instantaneous and total base composition. Biochimica et Biophysica Acta 518(2): 233-246

Derivative melting profiles of DNA have been obtained directly by recording the difference in absorbance between two identical solutions maintained at a small constant temperature differential. This deltaA is monitored continuously with increasing temperature in a ratio recording spectrophotometer. Resolution of complex hyperfine structure in the profiles of small homogeneous viral DNAs appears to be significantly better than has been produced by various numerical methods of differentiation. In addition, a spectral method has been modified that permits easy analysis for DNA base composition from the ratio of derivative melting curves obtained at 282 and 260 nm. Eight bacterial and three vertebrate DNAs have been analyzed for total base composition from the product of the instantaneous base composition at small temperature intervals (0.05 degrees C) throughout the entire melting region and the integrated area of the 282 nm profile. The results are in excellent agreement with values determined by traditional methods.

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Accession: 041408639

PMID: 418812

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