Heat-shock proteins (hsp) were elicited when mycelia of the Downs strain and the more virulent G184A and G222B strains of Histoplasma capsulatum were shifted up to temperatures which induced the mycelial-to-yeast transition (34-40 "C). The classes of the major hsp which increased in synthesis in each strain were similar. However, the pattern of synthesis of these proteins at the different temperatures in Downs differed from those in the G184A and G222B strains: hsp synthesis in Downs peaked at 34 "C, whereas in G184A and G222B it was highest at 37 "C.
We examined Saccharomyces cerevisiae mitochondrial RNA for polyadenylate. Using hybridization to [3H]polyuridylate as the assay for adenylate sequences, we found adenylate-rich oligonucleotides approximately 8 residues long. Longer polyadenylate was not detected. Most of the adenylate-rich sequence is associated with the large mitochondrial rRNA. The remainder is associated with the 10-12S group of transcripts.
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