Base de dados : IBECS
Pesquisa : D20.147 [Categoria DeCs]
Referências encontradas : 4 [refinar]
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Id: 138143
Autor: Ramió-Pujol, Sara; Ganigué, Ramon; Bañeras, Lluís; Colprim, Jesús.
Título: Impact of formate on the growth and productivity of Clostridium ljungdahlii PETC and Clostridium carboxidivorans P7 grown on syngas
Fonte: Int. microbiol;17(4):195-204, dic. 2014. ilus, tab.
Idioma: en.
Resumo: The current energy model based on fossil fuels is coming to an end due to the increase in global energy demand. Biofuels such as ethanol and butanol can be produced through the syngas fermentation by acetogenic bacteria. The present work hypothesizes that formate addition would positively impact kinetic parameters for growth and alcohol production in Clostridium ljungdahlii PETC and Clostridium carboxidivorans P7 by diminishing the need for reducing equivalents. Fermentation experiments were conducted using completely anaerobic batch cultures at different pH values and formate concentrations. PETC cultures were more tolerant to formate concentrations than P7, specially at pH 5.0 and 6.0. Complete growth inhibition of PETC occurred at sodium formate concentrations of 30.0 mM; however, no differences in growth rates were observed at pH 7.0 for the two strains. Incubation at formate concentrations lower than 2.0 mM resulted in increased growth rates for both strains. The most recognizable effects of formate addition on the fermentation products were the increase in the total carbon fixed into acids and alcohols at pH 5.0 and pH 6.0, as well as, a higher ethanol to total products ratio at pH 7.0. Taken all together, these results show the ability of acetogens to use formate diminishing the energy demand for growth, and enhancing strain productivity (AU)

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Id: 122977
Autor: Moro, Cedric; Harant, Isabelle; Badin, Pierre-Marie; Bourlier, Virginie; Langin, Dominique; De Glisezinski, Isabelle; Guilland, Jean-Claude; Patarca, François-Xavier.
Título: Influence of lipolysis and fatty acid availability on fuel selection during exercise
Fonte: J. physiol. biochem;70(2):583-591, jun. 2014.
Idioma: en.
Resumo: No disponible

The aim of the present study was to investigate the influence of substrate availability on fuel selection during exercise. Eight endurance-trained male cyclists performed 90-min exercise at 70 % of their maximal oxygen uptake in a cross-over design, either in rested condition (CON) or the day after 2-h exercise practised at 70 % of maximal oxygen uptake (EX). Subjects were given a sucrose load (0.75 g kg−1 body weight) 45 min after the beginning of the 90-min exercise test. Lipolysis was measured in subcutaneous abdominal adipose tissue (SCAT) by microdialysis and substrate oxidation by indirect calorimetry. Lipid oxidation increased during exercise and tended to decrease during sucrose ingestion in both conditions. Lipid oxidation was higher during the whole experimental period in the EX group (p = 0.004). Interestingly, fuel selection, assessed by the change in respiratory exchange ratio (RER), was increased in the EX session (p = 0.002) (..) (AU)
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Id: 122975
Autor: Elekofehinti, Olusola Olalekan; Ejelonu, Oluwamodupe Cecilia; Omotuyi, Idowu Olaposi; Kamdem, Jean Paul; Rocha, João Batista Teixeira; Alves, Guimarae Vanessa; Adanlawo, Isaac Gbadura.
Título: Saponin as regulator of biofuel: implication for ethnobotanical management of diabetes
Fonte: J. physiol. biochem;70(2):555-567, jun. 2014.
Idioma: en.
Resumo: No disponible

There has been a sharp rise in the global prevalence of diabetes, obesity, and their comorbid conditions within the last decade prompting significant research into possible causes and cure via therapeutic intervention and lifestyle adjustments. Here, the molecular bases of antidiabetic plants used in the prehistorical treatment of diabetes and obesity are reviewed with particular focus on saponin as the phytotherapeutic principle. Until recently, the phytotherapeutic potentials of saponins have been masked in the heterogeneity of phytochemicals co-extractable during traditional preparations. With improved technique of purification and cutting edge biological assay methods (..) (AU)
Responsável: ES1.1
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Id: 62538
Autor: Sonakya, Vikas; Raizada, Neena; Hausner, Martina; Wilderer, Peter A.
Título: Microbial populations associated with fixed- and floating-bed reactors during a two-stage anaerobic process
Fonte: Int. microbiol;10(4):245-251, dic. 2007. ilus, tab.
Idioma: En.
Resumo: Microbial populations associated with methanogenic fixed- or floating-bed bioreactors used for anaerobic digestion of lignocellulosic waste were investigated. Fluorescent in situ hybridization (FISH) was used to characterize microorganisms in samples obtained from different heights in the reactors, which were operated in a semi-continuous manner (feeding and mixing once every 2 days). The FISH results showed that Methanosaeta concilii cells were most numerous at the bottom of both reactors. M. concilii cells were more abundant in the fixed-bed reactor (FXBR), which performed better than the floating-bed reactor (FLBR). Species of the Methanosarcina genera (mainly M. barkeri and M. mazei) were also observed in the FLBR but rarely in the FXBR. Methane production in each of the reactors ranged from 0.29 to 0.33 m3 CH(4)/kg COD(rem) (chemical oxygen demand removed). The removal of volatile fatty acids (VFA; 70-75 h) in the FXBR was more efficient than in the FLBR (AU)

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Responsável: ES15.1 - Biblioteca Nacional de Ciencias de la Salud
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