It has been known since the work of Marshak (13) that nuclear ribonucleic acid (RNA) incor porates @82 at a much greater rate than cyto plasmic RNA. This has been confirmed by a num ber of investigators (@,10). Griffin and co-workers (7) showed that nuclear RNA, as obtained by the Schmidt and Thannhauser fractionation method (17), was more active in its rate of uptake of @32 in azo dye-induced ...

Pollution of water bodies by phosphorus in runoff from soil amended with animal manures is one of the greatest threats to water quality in developed countries. The environmental fate of manure phosphorus is determined in part by its chemical composition, yet extraction procedures to assess this are poorly developed and provide no structural information. We used solution 31P NMR spectroscopy to ...

The fractionation of active chicken tumor extracts has been continued. 1. By a rapid method of dialysis the diffusible fraction of the treated extract, representing about 75 per cent of the solids, has been eliminated without reducing the tumor-producing activity. 2. Combined methods of fractionation have resulted in the elimination of as much as 95 per cent of the total solids of the extract a...