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Studies on microbial RNases began in 1924 when NOGUCHI found nucleic acid degrading enzymes in Takadiastase, a commercially prepared digest from Aspergillus oryzae. In 1935 OrANI reported the presence of enzymes degrading yeast RNA in fungi (Aspergillus sp. etc.). In 1948, MCCARTY studied the nuclease activity in 36 strains of group A hemolytic Streptococci and indicated the release of both RNase and DNase from Streptococcal cells during growth in culture media. As is well known, these nucleases (TILLETT et al., 1948) are applied in the treatment of inflammatory exudates. In 1952, MUGGLETON...

Interest in the transition metal oxides with perovskite related structures goes back to the 1950s when the sodium tungsten bronzes NaxWO3 were shown to be metallic [1 ], the system Lal_xSr~MnO3 was found to contain a ferromagnetic conductive phase [2], and La0.sSr0.sCoO3 was reported to be a ferromagnetic metal, but with a peculiar magnetization of 1.5 #a/Co atom [3]. Stoichiometric oxide perovskites have the generic formula AMO3 in which the A site is at the center of a simple cubic array of M sites; the oxide ions form (180 4)) M O M bridges to give an MO3 array of corner shared MO6/2...

Interest in the transition metal oxides with perovskite related structures goes back to the 1950s when the sodium tungsten bronzes NaxWO3 were shown to be metallic [1 ], the system Lal_xSr~MnO3 was found to contain a ferromagnetic conductive phase [2], and La0.sSr0.sCoO3 was reported to be a ferromagnetic metal, but with a peculiar magnetization of 1.5 #a/Co atom [3]. Stoichiometric oxide perovskites have the generic formula AMO3 in which the A site is at the center of a simple cubic array of M sites; the oxide ions form (180 4)) M O M bridges to give an MO3 array of corner shared MO6/2...