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Additional resources for Advances in Biotechnology. Proceedings of the Fifth International Yeast Symposium Held in London, Canada, July 20–25, 1980

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Extremely high recirculation rates produce smaller densities of settled yeast, yet the residence time in the sedimenter is again long (V se d is high) in view of the high hydraulic load in the sedimenter. 8 H . J . Meyrath and R, Braun 30 ^FS HR Hydraulic Load F i g . 3: Computerized optimization of important v a r i a b l e s in the r e c i r c u l a t i o n system 44_ 2, 60 40' J» 2, 40 f 36 2,20 2, 00 > D M 32H OJ o —! -«. 0,8 0,6 r e c i r c u l a t i o n r a t e (h —ir~ 1,0 ~~1 1,2 ) F i g .

These parameters vary from distillery to distillery and it is, thus, difficult to describe a "typical fermentation" to cover all variations. The fermentation, described here, is typical for well-run plants, using good quality, well-modified malt. The yeast is inoculated during the first runnings from the mash tun. By the time the fermenter is filled, about 4 hours later, fermentation has already started. The short lag phase is due to properties of the M yeast. It also has very short lag phases between the utilization of individual sugars.

To obtain this energy,the cells metabolize their reserve carbohydrates, primarily the acetic acid-soluble fraction of glycogen and the trehalose (Sjöblom and Stolpe, I96U; Burrows, 1970). The most decisive factor influencing the keeping quality of baker's yeast is the temperature of the yeast and the environment. The biochemical composition of the yeast is another fundamental factor and the producers of compressed baker's yeast 51 K. Edelmann, P. Stelwagen and E. Oura 52 strive for a yeast vith a high content of cellular carbohydrates.

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