Provided is a labeling method for nucleic acid including a reaction step for hybridizing a nucleic acid probe that has a nucleotide sequence complementary to that of a nucleic acid to be labeled and contains a reactive nucleobase derivative incorporated at a position complementary to that of a target nucleobase as a target of labeling in the nucleic acid to be labeled, to the nucleic acid to be labeled; a transferring step for transferring a transfer group contained in the reactive nucleobase derivative to the nucleotide residue containing the target nucleobase in the nucleic acid to be labeled; and a labeling step for labeling the transfer group transferred to the nucleotide residue with a radioactive material.

Provided is a labeling method for nucleic acid including a reaction step for hybridizing a nucleic acid probe that has a nucleotide sequence complementary to that of a nucleic acid to be labeled and contains a reactive nucleobase derivative incorporated at a position complementary to that of a target nucleobase as a target of labeling in the nucleic acid to be labeled, to the nucleic acid to be labeled; a transferring step for transferring a transfer group contained in the reactive nucleobase derivative to the nucleotide residue containing the target nucleobase in the nucleic acid to be labeled; and a labeling step for labeling the transfer group transferred to the nucleotide residue with a radioactive material.

Technology provided herein relates in part to methods, processes, compositions and apparatuses for analyzing nucleic acid.

Technology provided herein relates in part to methods, processes, compositions and apparatuses for analyzing nucleic acid.

Methods modifying conventional SIP so that isotopic incorporation into the genomes of individual microbial taxa can be quantified are described. Further, methods to quantify the baseline densities of the DNA of individual microbial taxa without exposure to isotope tracers and then to quantify the change in DNA density of each taxon caused by isotope incorporation are described. The distribution of DNA of each taxon along a density gradient reflects the influence of isotope incorporation only, without reflecting the guanine-plus-cytosine content.

Methods modifying conventional SIP so that isotopic incorporation into the genomes of individual microbial taxa can be quantified are described. Further, methods to quantify the baseline densities of the DNA of individual microbial taxa without exposure to isotope tracers and then to quantify the change in DNA density of each taxon caused by isotope incorporation are described. The distribution of DNA of each taxon along a density gradient reflects the influence of isotope incorporation only, without reflecting the guanine-plus-cytosine content.