1,721,028 research outputs found
Effect of methylene blue on electron mediated microbial fuel cell by Saccharomyces cerevisiae
No full textMicrobial fuel cells (MFCs) are bioelectrochemical reactors that directly convert the chemical energy stored in chemical bonds of organic substrates, to electrical energy. Saccharomyces cerevisiae was implemented as biocatalyst in the anaerobic anode compartment of an MFC using glucose as carbon source and methylene blue as electron mediator. Our results showed the effect of methylene blue on the microbial metabolism and the reversibility of the redox reaction of the shuttle mediator in the presence and the absence of a carbon source. The implementation of this reaction in a yeast catalysed MFC suggested that the electron transfer from the cells to the anode was certainly limited by the mediator concentration in the solution. However, a higher influence on the biopower generation of the MFC seemed to be linked to the yeast adsorption on the electrode surface than to the reduced methylene blue concentration in solution
Characterization of electron mediated microbial fuel cell by saccharomyces cerevisiae
Full text linkMicrobial Fuel Cells (MFCs) is an innovative technology able to both clean organic waste of domestic or industrial origin and produce renewable energy converting directly chemical energy stored in chemical bonds to electrical energy. Our findings showed that the rate of substrate consumption (such as glucose) by Saccharomyces Cerevisiae (a common baker’s yeast) in the anaerobic compartment of a dual chambered MFC presented a great potential to generate electrons in a microbial fuel cell. Methylene blue was used as the electronophore in the anode compartment, while oxygen and hydrogen peroxide were tested as electron acceptors in the cathode compartment. The experiment was performed in closed circuit configurations under different loads ranging for evaluating the performance of the MFC with different concentration of methylene blue and electron acceptor. The fuel cell mediated by methylene blue carried out a maximum power generation of 110 mWm-2 and generated a maximum open circuit voltage of 479 mV with a short circuit current of 1.17 Am-2 with hydrogen peroxide as electron acceptor. The different contribute on the cell output of the mediator and electron acceptor concentration in anode and cathode compartment have been studied
«Venetia et Histria». Problemi di storia amministrativa
No full textVengono esaminati alcuni problemi relativi all'antica Venetia e all'antica Histria, dando a tali nomi il valore più comune, non quello della unità amministrativa tardo imperiale. Si considera l'uso nel tempo dei termini colonia e municipium, anche in base alla tabula Siarensis, per chiarire alcune questioni sullo status iniziale di Tergeste, riaperte da un testo epigrafico, recentemente scoperto da F. Maselli Scotti e presentato in questa sede da C. Zaccaria. Nel quadro di una cronologia più alta di quella tradizionale di venti ο trent'anni, il problema di Tergeste viene ripreso insieme a quelli della possibile estensione alla zona di Elleri della giurisdizione del municipium di Aquileia, della data dello spostamento
(v. retro) del confine nord-orientale al Formione, di accogliere o meno la teoria dell'inclusione, in un certo periodo, della Liburnia, entro i termini amministrativi dell'Italia.Fauro Rossi Ruggero. «Venetia et Histria». Problemi di storia amministrativa. In: Epigrafia. Actes du colloque international d'épigraphie latine en mémoire de Attilio Degrassi pour le centenaire de sa naissance. Actes de colloque de Rome (27-28 mai 1988) Rome : École Française de Rome, 1991. pp. 493-514. (Publications de l'École française de Rome, 143
Characterization of electron transfer mechanism in mediated microbial fuel cell by entrapped electron mediator in saccharomyces cerevisiae
Full text linkAttributed to exponentially growing global energy demand in current scenario, microbial fuel cells (MFCs) are an attempt aimed towards achieving electric energy sustainability, using renewable resources such as the organic substrates in domestic or industrial wastewater. In our findings growing cells of common baker's yeast such as Saccharomyces cerevisiae was immobilized by inclusion techniques in cellulose acetate membrane on the surface of a graphite electrode. Immobilized cells were grown using nutrient broth while the substrate, like electron donor in MFC, was glucose. The rate of substrate consumption of the anode electrode indicated that Saccharomyces cerevisiae, also immobilised, had a huge potential to generate electrons. Our results showed that the current and voltage output of a Saccharomyces cerevisiae based MFC are directly correlated to the cells on the micro-environment of the electrode and to the presence of an electron mediator such as methylene blue (MB). Our findings suggested that reduced methylene blue was entrapped into the cells, enhancing the electron transfer on the graphite electrode as an internal mediator of the cellular metabolism, probably linked to the oxidative electron cascade
«Venetia et Histria». Problemi di storia amministrativa
No full textVengono esaminati alcuni problemi relativi all'antica Venetia e all'antica Histria, dando a tali nomi il valore più comune, non quello della unità amministrativa tardo imperiale. Si considera l'uso nel tempo dei termini colonia e municipium, anche in base alla tabula Siarensis, per chiarire alcune questioni sullo status iniziale di Tergeste, riaperte da un testo epigrafico, recentemente scoperto da F. Maselli Scotti e presentato in questa sede da C. Zaccaria. Nel quadro di una cronologia più alta di quella tradizionale di venti ο trent'anni, il problema di Tergeste viene ripreso insieme a quelli della possibile estensione alla zona di Elleri della giurisdizione del municipium di Aquileia, della data dello spostamento
(v. retro) del confine nord-orientale al Formione, di accogliere o meno la teoria dell'inclusione, in un certo periodo, della Liburnia, entro i termini amministrativi dell'Italia.Fauro Rossi Ruggero. «Venetia et Histria». Problemi di storia amministrativa. In: Epigrafia. Actes du colloque international d'épigraphie latine en mémoire de Attilio Degrassi pour le centenaire de sa naissance. Actes de colloque de Rome (27-28 mai 1988) Rome : École Française de Rome, 1991. pp. 493-514. (Publications de l'École française de Rome, 143
Oxidative stress as a source of endocardial dysfunction in an accelerated model of congestive heart failure
No full textL’apoptosi dei macrofagi indotta dallo Streptococco di Gruppo B (GBS) è Ca2+-calpaine- dipendente
No full textDiet and drugs/medicines in sport: a preliminary investigation in a sample group of gym sportsmen.
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