This article was originally published with the title “ Radio Signals from Hydroxyl Radicals ” in Scientific American Magazine Vol. 219 No. 6 (December 1968), p. 36 doi:10.1038 ...

Although these molecules are far less abundant In the interstellar medium than atoms of hydrogen are, radio astronomers find that they reveal many fresh facts about the dynamics of the galactic center ...

DNA and RNA are composed of nucleotides that are linked to one another in a chain by chemical bonds ... on one nucleotide forms an ester bond with the free hydroxyl on the 3' carbon of the ...