Tissue nucleic acids: 1. Ribonucleic acids and nucleotides in embryonic and adult tissue.

Dox medium which contains 1.0 g. NaNO3/l. (0.1 %). As the nitrate concentration is further increased, the growth, indicated by the mycelium yield and the production of solerotiose, is progressively reduced. While Fig. 1 indicates that maximum KCl consumption is obtained on media of low nitrate content, Fig. 2 shows a parallelism of sclerotiorine production with growth, in nitrate concentrations up to 0-2 %, and hence independence of the KCI consumption. Above 0-2% sodium nitrate, it would appear that pigment production is inhibited by the nitrate. As this is also true of KCI utilization, it may be asserted that the production of sclerotiorine is responsive to nitrate concentration only when this factor greatly reduces the amount of KCI metabolized by the organism. The facts justify the previous assertion that pigment production is merely a by-product of the chloride consumption. SUMMARY