Cellular mechanisms of brain energy metabolism and their relevance to functional brain imaging
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In recent years a vast array of experimental evidence has indicated the presence of functional receptors for neurotransmitters on nonneuronal cells, in particular astrocytes. The two neurotransmitters vasoactive intestinal peptide (VIP) and noradrenaline ( ...
Aerobic chemostat cultures of Saccharomyces cerevisiae were performed under carbon-, nitrogen-, and dual carbon- and nitrogen-limiting conditions. The glucose concn. was kept const., whereas the ammonium concn. was varied among different expts. and differe ...
Several enzymes of the beta-oxidation pathway have been shown to be induced after stimulation with peroxisomal proliferators, including several hypolipidemic drugs. We investigated the regulation of the long-chain-acyl-CoA synthetase (ACS) gene in the live ...
Glucose is the main fuel for energy metabolism in the normal human brain. It is generally assumed that glucose transport into the brain is not rate-limiting for metabolism. Since brain glucose concentrations cannot be determined directly by radiotracer tec ...
To study intramitochondrial phospholipid flow, radiolabeled phosphatidylserine was introduced into isolated rat liver mitochondria from donor vesicles through the action of a nonspecific lipid transfer protein. Imported phosphatidylserine was rapidly decar ...
American Society for Biochemistry and Molecular Biology1992
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 ...
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 ...
The growth physiol. of S. cerevisiae strains H1022 and Whi2+ was studied in aerobic batch and continuous (chemostat) cultures. Results from the measurement of biomass and medium components (off-line) together with O2, CO2, and heat measurements (online) we ...
The effect of increasing [K+]0 on 3H-glycogen levels was examined in mouse cerebral cortical slices. K+ stimulates in a time- and concentration-dependent manner the hydrolysis of 3H-glycogen. Over 70% of the maximal effect is reached within 30 sec and the ...
Adenosine promotes a concentration-dependent hydrolysis of 3H-glycogen newly synthesized from 3H-glucose by mouse cerebral cortical slices. The EC50 for this effect is 7 microM. Theophylline antagonizes the glycogenolysis induced by adenosine with an EC50 ...
