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. 1970 Dec;104(3):1086–1094. doi: 10.1128/jb.104.3.1086-1094.1970

Methods for the Determination of Deoxyribonucleic Acid Homologies in Streptomyces

M Okanishi a,1, K F Gregory a
PMCID: PMC248264  PMID: 16559080

Abstract

Variations of the membrane filter technique for deoxyribonucleic acid (DNA) hybridizations were studied with respect to Streptomyces species. At the temperatures required for specific hybridization of DNA with the high melting temperature (Tm) characteristic of Streptomyces, large amounts (up to 97%) of filter-bound DNA became eluted, in all reaction mixtures studied, within 21 hr. In most solutions this leaching was increased by the presence of sheared denatured DNA. Incubation of DNA-loaded filters in a solution of 50% formamide containing 6× standard saline citrate, at 48 C for 40 hr, was judged to be the best set of conditions tested based on relatively good retention of immobilized DNA, very low hybridization with unrelated DNA of a similarly high Tm (from Sarcina lutea), and the formation of complexes similar in thermal stability to the native DNA. The expression of results as sheared DNA bound in relation to long-chain DNA retained is recommended when a high concentration of sheared DNA relative to immobilized DNA is used.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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