Letter from Kai O. Pedersen to Michael Heidelberger

Digital Record

Identifier: 101584940X227

Staff Only

Digital Object (text)

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Dates

Creation: 27 January 1935

Extent

4 pages

Description

Twice, in 1934 and 1936, Heidelberger received a John Simon Guggenheim Memorial Fellowship for a stay of six weeks at the University of Uppsala in Sweden, where he used the first ultracentrifuge, constructed by Theodor Svedberg and Kai O. Pedersen, to determine the molecular weight of various proteins. During his first visit, he brought purified thyroglobulin, a protein secreted by the thyroid gland. In experiments completed by Pedersen after Heidelberger's departure and discussed by Pedersen in this letter, the two found to their surprise that thyroglobulin was of high molecular weight.