George K. Helmkamp

Interaction and Association of Bases and Nucleosides in Aqueous Solutions. III. A Nuclear Magnetic Resonance Study of the Self-Association of Purine and 6-Methylpurine^1b

Sunney I. Chan, Martin Schweizer, Paul O. P. Ts’o et al. · Journal of the American Chemical Society · 1964 · 201 citations

Life Sciences, Biochemistry, Chemistry +12

An Experimental Assignment of the Proton Magnetic Resonance Spectrum of Purine

Martin Schweizer, Sunney I. Chan, George K. Helmkamp et al. · Journal of the American Chemical Society · 1964 · 141 citations

Natural Sciences, Biochemistry, Chemistry +8

The Secondary Structures of Nucleic Acids in Organic Solvents¹

George K. Helmkamp, Paul O. P. Ts’o · Journal of the American Chemical Society · 1961 · 133 citations

Life Sciences, Biochemistry, Chemistry +12

INTERACTION OF NUCLEOSIDES AND RELATED COMPOUNDS WITH NUCLEIC ACIDS AS INDICATED BY THE CHANGE OF HELIX-COIL TRANSITION TEMPERATURE

Paul O. P. Ts’o, George K. Helmkamp, Christian Sander · Proceedings of the National Academy of Sciences · 1962 · 126 citations · Full text

Life Sciences, Cell Biology, Molecular Biology +14

Secondary structures of nucleic acids in organic solvents II. Optical properties of nucleotides and nucleic acids

Paul O. P. Ts’o, George K. Helmkamp, Christian Sander · Biochimica et Biophysica Acta · 1962 · 108 citations

Life Sciences, Biochemistry, Chemistry +17