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947 records · Page 53Linked to original sources
PubMed1976

Effect of acetic and trans-aconitic acids on citric acid production by Aspergillus niger.

The effect of acetic and trans-aconitic acids on citric acid production by A. niger at different pH values was studied. The presence of acetic acid at pH 2 prevented spore germination, while it decreased the fungal growth and citric acid production at other pH values. In the presence of trans-aconitic acid the inhibition was less marked at lower than at higher pH values.

Acetates↗
PubMed1996

Expression of acylphosphatase in Saccharomyces cerevisiae enhances ethanol fermentation rate.

Previous experiments in vitro have demonstrated the ability of acylphosphatase to increase the rate of glucose fermentation in yeast. To evaluate the possibility of increasing fermentation in vivo also, a chemically synthesized DNA sequence coding for human muscle acylphosphatase was expressed at high level in Saccharomyces cerevisiae. Ethanol production was measured in these engineered strains in comparison with a control. Acylphosphatase expression strongly increased the rate of ethanol production both in aerobic and anaerobic culture. This finding may be potentially important for the development of more efficient industrial fermentation processes.

Acid Anhydride Hydrolases↗
PubMed1995

[Proteolytic activity control in fish silage].

Microbial fish silage was produced from ground low commercial fish species added with 15% mollase and stored at 35 degrees C. Experiment were conducted to evaluate the effect of the addition of a commercial preparation of bromeline (0.20-0.90%) to the fish silage. Liquefaction was evaluated measuring both the product consistency and its non protein nitrogen content. Results indicate that bromeline addition (0.7 or higher), increases dramatically the rate of proteolysis and decreases the time required for liquefaction from 15 days (no enzyme control) to only 12 hours. Therefore, the use of the commercial preparation of bromeline is highly recommended for silage production.

Animals↗