(1906-1981) German–American biophysicist, helped launch the molecular biology research program in the late 1930s. He shared the 1969 Nobel Prize in Physiology or Medicine.
Autograph letter signed, two pages (both sides), 8,5 x 11 inch, `California Institute of Technology` stationery, Pasadena (California), 18.10.1977, to Dr. E. B. Kearney in San Francisco - concerning rf reduction and uptake, written and signed in black ink "M. Delbrück", with two horizontal letter folds - in nearly very fine condition.
"Dear Dr. Kearney:
There is one item of observation I failed to mention in our discussion which may be relevant to the Rf uptake mysteries, especially to the question of obligatory coupling of Rf reduction and uptake. ... I then tested whether cys or met slowed down the utilization of Rf in the riboflorin auxotroph. (They did (cys especially). ..."
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