higher spore concentrations are achievable for a given biomassconcentration. They also showed that nutrient feedingcould increase whole broth toxicity proportionally withspore count at biomass concentrations up to 36.4g/L; ata biomass concentration of 53.7g/L, however, broth toxicitywas no higher and viable spore count fell precipitously.These results also imply that the high-biomass fed-batchresults of Arcas et al. (1987) may have been suboptimalin terms of broth toxicity. Based on these results the twofermentations of Liu et al. (1994) giving the highest sporeconcentrations (runs #6 and #7) were assumed tobe representative of results potentially achievable via fedbatchfermentation.For the batch fermentation
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