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The prodn. of lactic acid in a cell-recycle reactor was investigated. Studies were conducted with L. helveticus on a supplemented whey permeate medium. At 42 Deg and pH 5.5, the biomass was kept const. at 21.3 g/L. The volumetric lactic acid productivity w ...
Astrocytes appear to be ideally localized to couple neuronal activity to energy metabolism. First, specialized processes, the astrocytic end-feet surround blood vessels, the source of glucose for the brain. Second, other processes ensheath synapses and exp ...
The prodn. of acetate from the fermn. of lactate by Gluconobacter oxydans was studied. Batch expts. showed that glucose was the preferred substrate compared to lactate. A fed-batch culture was fed with a mixt. of glucose and lactate followed by periodic ad ...
Under particular circumstances like lactation and fasting, the blood-borne monocarboxylates acetoacetate, beta-hydroxybutyrate, and lactate represent significant energy substrates for the brain. Their utilization is dependent on a transport system present ...
A simple definition of the energetic growth efficiency both in terms of enthalpy and free energy is given and discussed. In cultures growing by respiratory catabolism, these efficiencies may conveniently be obsd. online by isothermal reaction calorimetry. ...
Batch and continuous 2-stage cultures were conducted to det. the effect of yeast ext. (YE) on the homolactic fermn. of whey permeate by L. helveticus. Supplementation with YE had a significant effect on lactic acid concn., volumetric productivity, and subs ...
A modified bench scale calorimeter has been employed to det. the heat generated by various microbial strains growing on a range of different substrates, covering degrees of redn. from 3 to 6.13. The results are analyzed and interpreted in the light of coup ...
A novel heat-flux calorimeter was used to study the growth of Kluyveromyces fragilis on a variety of C substrates. Heat liberated was directly related to biomass formed and also to O2 consumed. Heat yield coeffs. derived from these relationships allowed th ...
The effect of diln. rate on the prodn. of lactic acid from whey permeate by L. helveticus was investigated. In the 1st chemostat of a 2-stage system, total conversion (98.1%) and max. lactic acid concn. (43.7 g/L) were obtained at a diln. rate (D1tot) of 0 ...
The effect of pH on growth and lactic acid prodn. of L. helveticus was investigated in a continuous culture using supplemented whey ultrafiltrate. Max. lactate productivity of 5 g/L/h occurred at pH 5.5. Whey permeates concd. up to 4 times were fermented u ...