For batch SSCF, 1 g/L S. cerevisiae KE6-12 was used for inoculation whereas 3 g/L was used for fed-batch SSCF (taking into account the initial substrate loading, 6% DM (w/v)).
Till date, the strategies used for fed-batch enzymatic saccharification are categorized into three main groups i.e., (i) to recycle enzyme; (ii) fed-batch SSF to mitigate inhibitory effect and (iii) fed-batch saccharification to increase the cumulative substrate in a reactor [ 7].
400 mL DASGIP parallel stirred tank bioreactors (DASGIP AG) with a maximum working volume of 300 mL were used for fed-batch process optimization, while a 3 L Biostat B-Plus, a 15 L Biostat C and a 150 L Biostat D (Sartorius Stedim Biotech) system with a maximum working volume of 2 L, 10 L and 100 L, respectively, were used for scale-up studies and protocol consistency trials.
Since most of the newly cleared lands are used for rain-fed agriculture, a feasible way to preserve carbon is to implement non-till, minimum tillage or tillage conservation practices at the beginning of farming.
Two loadings of enzymes containing the mixture of Cellic Ctec2 (cellulase) and Cellic Htec2 (endoxylanase) kindly provided by Novozymes (A/S, Bagsvaerd, Denmark) were applied under the batch process but only a single dosage was used for the fed-batch process.
Although the dose of 400 IU daily is used for both breast-fed and formula-fed babies, vitamin D-deficient rickets is extremely rare in formula-fed infants primarily due to the mandatory addition of vitamin D to infant formulas in the United States.
These cells when used for a second fed batch reaction (40 mL) successfully converted 700 mM of 4-CP to INA in 2 h 20 min. This showed that the nitrilase of N. globerula NHB-2 was stable at 35°C and could be recycled through suitable immobilization techniques.
A 5-L bioreactor (LSL Biolafitte, USA) was used for batch and fed-batch cultivation of heterotrophic N. oleoabundans.
The cells used for starch-hydrolysate-fed fermentation with 20 g/L cell concentration were stored in a refrigerator for two weeks (it has previously been found that the performance of this yeast does not change when stored in a refrigerator for up to a month, data not shown).
This is the pH range commonly used for P. pastoris fed-batch cultures, with pH boundaries set by reduced growth of P. pastoris below pH 3 and salt precipitation of basal salts media above pH 5 (Files et al. 2001; Zhang et al. 2007).
