John S. Helmick

Reactivity and selectivity of nitrenium ions derived from ester derivatives of carcinogenic N-(4-biphenylyl)hydroxylamine and the corresponding hydroxamic acid

Michael Novák, Mary Jo Kahley, Emily Eiger et al. · Journal of the American Chemical Society · 1993 · 91 citations

Chemical Safety, Nitrenium Ions, Chemical Analysis +12

Mechanism of the reaction of carbon and nitrogen nucleophiles with the model carcinogens O-pivaloyl-N-arylhydroxylamines: competing SN2 substitution and SN1 solvolysis

John S. Helmick, Kristy A. Martin, Julie L. Heinrich et al. · Journal of the American Chemical Society · 1991 · 55 citations

Engineering, Chemical Analysis, Altmetric Attention Score +17

Attempted pupillary conditioning at four stimulus intervals.

Ernest R. Hilgard, Charles E. Dutton, John S. Helmick · Journal of Experimental Psychology · 1949 · 22 citations

Cognitive Science, Attempted Pupillary Conditioning, Attention +4

The electrochemical preparation and kinetic and product studies of acylated quinol and quinol ether imines. In search of the hydrolysis products of the ultimate carcinogen of N-acetyl-2-aminofluorene

Michael Novák, John S. Helmick, Nicholas H. Oberlies et al. · The Journal of Organic Chemistry · 1993 · 18 citations

Halogenation, Chemical Engineering, Hydrolysis Products +11

Pursuit learning as affected by size of target and speed of rotation.

John S. Helmick · Journal of Experimental Psychology · 1951 · 17 citations

Sensorimotor Control, Cognitive Science, Kinesiology +11