Abstract: A method for sequencing DNA by hybridization that includes the following steps: forming an array of oligonucleotides at such concentrations that either ensure the same dissociation temperature for all fully complementary duplexes or allows hybridization and washing of such duplexes to be conducted at the same temperature; hybridizing said oligonucleotide array with labeled test DNA; washing in duplex dissociation conditions; identifying single-base substitutions in the test DNA by analyzing the distribution of the dissociation temperatures and reconstructing the DNA nucleotide sequence based on the above analysis. A device for carrying out the method comprises a solid substrate and a matrix rigidly bound to the substrate. The matrix contains the oligonucleotide array and consists of a multiplicity of gel portions. Each gel portion contains one oligonucleotide of desired length. The gel portions are separated from one another by interstices and have a thickness not exceeding 30 .mu.m.

Abstract: The compounds of the invention are 5'-phosphonates of 3'-azido-2',3'-dideoxynucleosides having the following general formula: ##STR1## where B is thymin-1-yl, cytosin-1-yl, adenin-9-yl, or guanin-9-yl. The compounds according to the present invention are selective inhibitors of replication of the human immunodeficiency virus in a culture of human lymphocytes.