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- W2100511338 abstract "Abstract The degree of chromosomal DNA (cDNA) denaturation and renaturation on polytene chromosomes has been measured by UV microspectrophotometry. Also DNA losses occurring upon denaturation have been quantified by Feulgen, gallocyanin-chromalum and UV. It has been observed that denaturation in alkali (0.07 N NaOH at room temperature) and formamide (90% formamide; 0.1 SSC, pH 7.2) at 65 °C removes about 30% of the DNA. Low DNA loss occurs upon denaturation in HCl (0.24 M) at room temperature and 60% formamide: 2 × 10 −4 M EDTA (pH 8) at 55 °C. The presence of 4% formaldehyde in the denaturation buffer prevents DNA loss. After denaturation of chromosomes in 0.1 × SSC containing 4% formaldehyde at 100 °C for 30 sec, an hyperchromicity of 39 °C is observed. The denaturation efficiency varies with the denaturation treatment. The percentage reassociation was measured from the difference in the UV absorption of renatured chromosomes and that of denatured chromosomes from the same set. It seems that in our conditions DNA:DNA reassociation does not occur. The efficiency of hybridization is proportional to the denaturation extent of the DNA. However, the entire fraction of DNA which has been denatured is not available for hybridization." @default.
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- W2100511338 date "1979-03-01" @default.
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- W2100511338 title "Chromosomal DNA denaturation and reassociation in situ" @default.
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- W2100511338 doi "https://doi.org/10.1016/0014-4827(79)90344-6" @default.
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