No abstract

Y.Y. TSENG, M.T. CHEN and C.F. LIN.2000. The effect of different levels of salt, sodium nitrite, polyphosphate and various sugars on growth, pigment production, protease activity and culture pH caused by Monascus purpureus was studied in broth medium and ground meat. The addition of sodium chloride (>50·0 g l−1) and polyphosphate (>3·0 g l−1) to broth medium decreased mycelial growth, pigment production and protease activity of M. purpureus, whereas low concentrations of sodium nitrite (<0·2 g l−1) promoted mycelial growth and pigment production. When the basal medium and ground meat contained salt, 150·0 g l−1, the mould growth was stopped. The medium with fructose as carbon source proved to be the most suitable for mycelium growth and pigment production, with maltose and glucose being the second most productive. When sucrose and lactose were used as carbon sources, mycelium growth and pigment production were inhibited but the protease activity increased significantly. The mould showed more tolerance to salt and polyphosphate in ground meat than in broth medium and used sucrose as a carbon source as well as glucose for growth and pigment production in the meat mixture.

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Silylene-spaced copolymers with alternating azacrown and anthracene moieties were synthesized for photoinduced electron transfer investigations. These polymers exhibited efficient intrachain photoinduced electron transfer with charge separation yield about 0.96-0.99 and corresponding charge-transfer rates around 10.8-32.2 ns -1 in different solvents. Metal cations have been shown to enhance the fluorescence intensity due to complexation. These results are comparable to those of small molecules having similar chromophores. The geminal dimethyl substituents on silicon in these copolymers may direct the relative conformation (or distance) of the remaining substituents on silicon. Intrachain interactions between these chromophores may readily take place leading to highly efficient electron transfer processes.