Encontrados 20 documentos, a visualizar página 1 de 2
Enhanced lipidic algae biomass production using gas transfer from a fermentativ...
Santos, Carla A.; Caldeira, M. L.; Silva, Teresa Lopes da; Novais, J. M.; Reis, AlbertoIn order to produce single-cell oil for biodiesel, a yeast and a microalga were, for the first time, grown in two separate reactors connected by their gas-phases, taking advantage of their complementary nutritional metabolisms, i.e., respiration and photosynthesis. The yeast Rhodosporidium toruloides was used for lipid production, originating a carbon dioxideenriched outlet gas stream which in turn was used to ...
Sources of hepatic triglyceride accumulation during high-fat feeding in the hea...
Delgado, T. C.; Pinheiro, D.; Caldeira, M.; Castro, M. M. C. A.; Geraldes, C. F. G. C.; López-Larrubia, P.; Cerdán, S.; Jones, J. G.Hepatic triglyceride (HTG) accumulation from peripheral dietary sources and from endogenous de novo lipogenesis (DNL) was quantified in adult Sprague-Dawley rats by combining in vivo localized 1H MRS measurement of total hepatic lipid with a novel ex vivo 2H NMR analysis of HTG 2H enrichment from 2H-enriched body water. The methodology for DNL determination needs further validation against standard methodologie...
Regulation of AMPA receptors and synaptic plasticity
Santos, S. D.; Carvalho, A. L.; Caldeira, M. V.; Duarte, C. B.Neuronal activity controls the strength of excitatory synapses by mechanisms that include changes in the postsynaptic responses mediated by AMPA receptors. These receptors account for most fast responses at excitatory synapses of the CNS, and their activity is regulated by various signaling pathways which control the electrophysiological properties of AMPA receptors and their interaction with numerous intracell...
Quantification of hepatic transaldolase exchange activity and its effects on tr...
Jones, John G.; Garcia, Paula; Barosa, Cristina; Delgado, Teresa C.; Caldeira, M. Madalena; Diogo, LuisaExchange of hepatic glucose-6-phosphate (G6P) and glyceraldehyde-3-phosphate via transaldolase modifies hepatic G6P enrichment from glucose or gluconeogenic tracers. Transaldolase exchange was quantified in five healthy, fed subjects following an oral bolus of [1,2,3-13C3]glycerol (25-30 mg/kg) and paracetamol (10-12 mg/kg). 13C Isotopomers of hepatic G6P were quantified by 13C NMR spectroscopy of urinary glucu...
Role of the brain-derived neurotrophic factor at glutamatergic synapses
Carvalho, A. L.; Caldeira, M. V.; Santos, S. D.; Duarte, C. B.The neurotrophin brain-derived neurotrophic factor (BDNF) plays an important role in the activity-dependent regulation of synaptic structure and function, particularly of the glutamatergic synapses. BDNF may be released in the mature form, which activates preferentially TrkB receptors, or as proBDNF, which is coupled to the stimulation of the p75(NTR). In the mature form BDNF induces rapid effects on glutamate ...
Stable isotopes as ecological tracers: an efficient method for assessing the co...
Bugalho, M.N.; Barcia, P.; Caldeira, M.C.; Cerdeira, J.O.Stable isotopes are increasingly being used as tracers of ecological processes potentially providing relevant information to environmental management issues. An application of the methodology consists in relating the stable isotopic composition of a sample mixture to that of sources. The number of stable isotopes, however, is usually lower than that of potential sources existing in an ecosystem, which creates m...
Randon amplified polymorphic DNA in the analysis of isolates of Haemonchus (Nem...
Guimarães,M.P.; Gomes,M.A.; Caldeira,M.C.Utilizou-se a técnica de DNA polimórfico amplificado ao acaso (RAPD) para a análise de 14 amostras de Haemonchus, um tricostrongilídeo parasito do abomaso de bovinos, originárias de diferentes regiões do estado de Minas Gerais. Os perfis foram obtidos utilizando-se cinco iniciadores diferentes. Não houve correlação entre polimorfismo observado com a origem do animal ou com a espécie de Haemonchus estudada.
Hepatic UDP-glucose 13C isotopomers from [U-13C]glucose: A simple analysis by 1...
Mendes, Ana C.; Caldeira, M. Madalena; Silva, Cláudia; Burgess, Shawn C.; Merritt, Matthew E.; Gomes, Filipe; Barosa, Cristina; Delgado, Teresa C.Menthol glucuronide was isolated from the urine of a healthy 70-kg female subject following ingestion of 400 mg of peppermint oil and 6 g of 99% [U-13C]glucose. Glucuronide 13C-excess enrichment levels were 4-6% and thus provided high signal-to-noise ratios (SNRs) for confident assignment of 13C-13C spin-coupled multiplet components within each 13C resonance by 13C NMR. The [U-13C]glucuronide isotopomer derived...
Noninvasive analysis of hepatic glycogen kinetics before and after breakfast wi...
Jones, John G.; Fagulha, Ana; Barosa, Cristina; Bastos, Margarida; Barros, Luisa; Baptista, Carla; Caldeira, M. Madalena; Carvalheiro, ManuelaThe contributions of hepatic glycogenolysis to fasting glucose production and direct pathway to hepatic glycogen synthesis were quantified in eight type 1 diabetic patients and nine healthy control subjects by ingestion of (2)H(2)O and acetaminophen before breakfast followed by analysis of urinary water and acetaminophen glucuronide. After overnight fasting, enrichment of glucuronide position 5 relative to body...
Simple measurement of gluconeogenesis by direct 2H NMR analysis of menthol gluc...
Ribeiro, Angela; Caldeira, M. Madalena; Carvalheiro, Manuela; Bastos, Margarida; Baptista, Carla; Fagulha, Ana; Barros, Luisa; Barosa, CristinaThe contribution of gluconeogenesis to fasting glucose production was determined by a simple measurement of urinary menthol glucuronide (MG) 2H enrichment from 2H2O. Following ingestion of 2H2O (0.5% body water) during an overnight fast and a pharmacological dose (400 mg) of a commercial peppermint oil preparation the next morning, 364 mumol MG was quantitatively recovered from a 2-h urine collection by ether e...
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