Heidi Y. Sung

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A mutant of Bacillus subtilis IMR-NK1, which is used for the production of domestic "natto" in Taiwan, produced high fibrinolytic enzyme activity by solid-state fermentation using wheat bran as medium. In addition, a strong fibrinolytic enzyme was purified from the cultivation media. The purified enzyme was almost homogeneous, as examined by SDS-PAGE and(More)
This study analyzes the interactive effects of oligopoly pricing, state taxation, and anti-smoking regulations on retail cigarette prices by state, using panel data for the 50 US states between 1960 and 1990. The results indicate that cigarette producers do price-discriminate by state, though the effect is not large relative to the final retail price. There(More)
OBJECTIVES The purpose of this study was to examine the relative effects of taxation vs an anti-smoking media campaign on cigarette consumption in California. METHODS Quarterly cigarette sales data reported by the California State Board of Equalization between 1980 and 1992 were used to estimate a time-series model, adjusted for seasonal variations and(More)
Fission yeast responded to environmental cadmium by producing a family of small Cd-binding peptides, phytochelatins (PCn). A low molecular weight (LMW) complex essentially composed of PC2, and PC3 was produced and then disappeared gradually in 24 hrs after Cd treatment, which served as a transient form for a temporary but quick relief of Cd in the cytosoL(More)
Four invertase isozymes have been isolated from the milky stage rice grains. According to the pH optima, they are classified as one alkaline (IT7) and three acid invertases. The acid invertases are further divided into two soluble forms (IT4 and IT5) and one cell wall-bound (ITb) form which was solubilized in 1 M NaCl. The pH optima of ITb, IT4, IT5 and IT7(More)
Polyacrylamide gel slabs can be dried quickly without elaborate tools and the results are similar or even better than those obtained with a commercial drying apparatus. The discontinuous, sodium dodecyl sulfate, and gradient polyacrylamide gel slabs yielded similar results regardless of the staining methods, e.g., Coomassie blue, periodate-Schiff's reagent,(More)
A phosphodiesterase was purified from barley rootlets by polyethylene glycol fractionation, calcium phosphate gel-cellulose adsorption, Sepharose CL-4B gel filtration, DEAE-Sepharose CL-6B ion exchange and preparative polyacrylamide gel electrophoresis (PAGE). The enzyme was purified by 103.6 folds and 11% of the enzyme activity was recovered. The purified(More)
By cloning and sequencing cDNA and genomic DNA and transcription initiation site mapping, the total structures including at least 1 kb of putative regulatory sequences upstream of the transcription initiation sites of three genes encoding rice sucrose synthase isoprotomers were either newly established or amended. The third type of SS gene, RSus3, has not(More)
The rapid growth of adventure travel is now represented by a wide variety of adventure travel activities but has not been fully recognized as a topic for empirical research to date. This study attempts to segment the adventure travel market by activities as the key products. Data were collected from adventure travel providers (N = 178) through survey(More)