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David Rittenberg, November 11, 1906 — January 24, 1970 | By David Shemin and Ronald Bentley | Biographical Memoirs (4200 words) |
 | Rittenberg, one of Urey's graduate students, obtained a Ph.D. degree in 1934 for his 30-page thesis, "Some Equilibria Involving Isotopes of Hydrogen." Urey was anxious to promote the study of both chemical and biological properties of deuterium, and received funding from the Rockefeller Foundation. |
| The second elaboration was that Rittenberg, Shemin, and London began to study the synthesis of protoporphyrin in vitro using immature non-nucleated mammalian erythrocytes and the red blood cells of the duck. |
| David Sprinson worked with Rittenberg on ammonia utilization for protein synthesis and the rate of reaction of dietary amino acids with tissue proteins before going on to the major, independent study of the pathway for shikimic acid biosynthesis, for which he received much recognition. |
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