By Graham G. Stewart
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Extra resources for Advances in Biotechnology. Proceedings of the Fifth International Yeast Symposium Held in London, Canada, July 20–25, 1980
Statistical analysis revealed that the figures for the decline in trehalose content are more reliable than those for acetic acid-soluble glycogen. Changes in Fermentative Activity on Storage During storage a gradual decline of the fermentative activity was observed (Fig. 3). The loss of activity was faster in the sugar-rich dough than in the salt dough suggesting that the osmosensitivity of the yeast increased during storage. FERMENTATION POWER IN A SUGAR-RICH WHEAT DOUGH AM'C ANA ICC \\A/30"C \ANA/30'C 30 40 TIME OF STORAGE 50 DAYS N A«STORED IN 50G PIECES ANA-* - 1 K B BLOCKS -ANA/arc .
By balancing the faster and slower fermenting yeast, it is possible to maintain a reasonably consistent fermentation. There are numerous examples of how this can be applied. In warmer weather the fermentation rate increases, but this can be reduced by decreasing the primary:secondary strain ratio. The fermentation rate is slower, when the worts are low in readily fermentable sugars, as is the case with undermodified malt. This is overcome by using more of the primary yeast. (a) Fiq 1 (b) The carbohydrate utilization in fermentations with (a) D1 and (b) D6 as the primary yeast.
D. 5 - HR REACT 3 - HR FILL, ï - HR REACT E 75,000 5,000 Fig. 2. Yeast solids concentration as a function of time during the fill and react periods. 5 - HR REACT 3 - HR FILL, 1 - HR REACT TIME (fir) Fig. 3. COD as a function of time during the fill and react periods. 1 2 i 1 TIME (fir) Fig. 4. Dissolved oxygen concentration as a function of time during the fill and react periods. Our studies indicate that the assimilation of low pH wastes by K. fragilis in sequencing batch reactors may have economic value in waste disposal and in the production of fodder yeast.
Advances in Biotechnology. Proceedings of the Fifth International Yeast Symposium Held in London, Canada, July 20–25, 1980 by Graham G. Stewart