B2

For instance, if your interest rate is shown in cell B1 and the initial investment is shown in B2, the formula for the interest after the first year is = B2+ ((B1 / 100) * B2) for both simple and compound interest.

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György initially asked Kuhn to isolate vitamin B2 from the livers of rats upon which he had been experimenting, but they quickly expanded their efforts, purifying flavin pigments from plants and animal materials.

Richard Kuhn and the Chemical Institute: Double Bonds and Biological Mechanisms 2010

Kuhn, who had remained in close contact with Warburg since coming to Heidelberg, quickly realized that his lumiflavin was probably the same substance as Warburg's oxidation enzyme and proposed that vitamin B2 is its precursor.

Richard Kuhn and the Chemical Institute: Double Bonds and Biological Mechanisms 2010

(B2 is one of the few vitamins with which overdoses result in harmful effects).

Richard Kuhn and the Chemical Institute: Double Bonds and Biological Mechanisms 2010

Vitamin B2 had been discovered in 1926 by Goldberg and some of the effects of B2 deficiencies were known, including a relation to the disease pellagra in man (a severe problem in Spain at the time) and skin diseases in animals.

Richard Kuhn and the Chemical Institute: Double Bonds and Biological Mechanisms 2010

They were the first to isolate and purify vitamin B2 (riboflavin) and soon demonstrated how this compound works as a growth factor in biological processes.

Richard Kuhn and the Chemical Institute: Double Bonds and Biological Mechanisms 2010

From the beginning, Kuhn assumed a fixed relationship between vitamin B2 and the flavins his assistants had isolated, especially after correlating the sensitivity of B2 to specific wavelengths of light and the absorption patterns of the flavin pigments.

Richard Kuhn and the Chemical Institute: Double Bonds and Biological Mechanisms 2010

Work on vitamin B2 evolved naturally into investigations of the larger vitamin B complex.

Richard Kuhn and the Chemical Institute: Double Bonds and Biological Mechanisms 2010

One of them is vitamin B2, also called factoflavin, which was discovered by Warburg and

Nobel Prize in Chemistry 1937 - Presentation Speech 1966

Kuhn has the great merit, together with von Szent-Györgyi and Wagner-Jauregg, of having been the first to isolate the extraordinarily important substance Vitamin B2

Nobel Prize in Chemistry 1938 - Presentation Speech 1966