E. B. Hart

TL;DR: The essentiality of copper for hemopoiesis in an animal was demonstrated by Elvehjem's group at the University of Wisconsin this article, who showed that copper deficiency in malnourished infants is a sign of deficiency.

TL;DR: In continuing the studies in this laboratory on new factors required by growing chicks, the authors have encountered a severe choline deficiency and chicks upon their basal ration show inferior growth and severe perosis which are entirely prevented by the addition of 0.1 per cent choline to the diet.

TL;DR: This investigation was carried out with the view that a drug or combination of drugs that would completely inactivate all bacteria in the intestinal tract would be highly desirable, since investigators would be provided with an essentially sterile animal and vitamin requirements could be studied uncomplicated by “intestinal vitamins” or toxic substances.