The object of this investigation has been (a) to determine the changes in the chemical composition of the urine and feces due to the ingestion of bakers’ yeast and the relation of these changes to intestinal putrefaction and (b) to determine whether yeast used under controlled conditions has a laxative action. The use of yeast in the treatment of constipation is not a new or unusual practice, f...

Electron spin resonance studies of the in vivo response to fungicides (chloranil and thiram) by Aspergillus niger of different ages are described. The spores possessed a natural free radical signal which grew rapidly upon application of chloranil. Thiram, on the other hand, produced weak changes in the free radical region but easily detectable changes at lower fields, indicating involvement of ...

Partial recovery of ultraviolet-damaged denatured or native transforming DNA from Hemophilus influenzae, has been obtained by exposing the irradiated DNA in the denatured form to nitrous acid. Some factors that affect this recovery are described. An erythromycin marker (E(20)) was not reactivated. The UV damage reactivable by nitrous acid is different from that repaired by the photoreactivating...