287 research outputs found
Use of filamentous fungi for improving electricity production and textile dye treatment in a microbial fuel cell
Urban and industrial wastewaters have received an increased interest towards energy harvesting using microbial fuel cells (MFC). The combined use of microbial anode oxidizing organic substrates and enzymatic cathode reducing oxygen is a promising new approach for the simultaneous treatment of wastewater and generation of electricity. In this context, our study evaluated the performance of a two-chambered MFC operated with three laccase producing strains of filamentous fungi (Ff), immobilized on the cathodic compartment and filled up with simulated textile dye effluent (TDE) and urban wastewater in the anodic compartment. The result indicated a rapid TDE decolourisation (>86 % within 72 h). Electrochemical monitoring of the MFC during TDE decolourisation indicated power density (>35 mW m2, control 3,61) and laccase activity (989.6 U lâ1) in the presence of Pleurotus ostreatus on the cathodic compartment. Considering the initial COD value of 464 ± 20 mg.l-1, the organic removal in the anodic compartment after 20 days of MFC operation was 90.2%. Final toxicity measurements in the TDE treated indicated a much lower impact when compared to the original TDE. These are the initial studies to select Ff as models for MFC application and further adaptation for wastewater treatment and bioelectricity generatio
In situ Trametes versicolor laccase biocathode performance assessment in dual-chamber microbial fuel cells
White-rot fungi (WRF) synthesize ligninolytic extracellular oxidative enzymes such as laccase (Lcc), which has been described as one of the most interesting types of redox enzymes that can improve microbial fuel cell (MFC) performance. Therefore, and in order to test that performance, WRF Trametes versicolor MUM 04.100 was immobilized in nylon sponge and fixed in the MFC cathode chamber, while Lcc activity, bioelectricity production, and organic matter removal were monitored. It was found that current density measured in the MFC supplemented with fungi was 2.1 times higher (42.81±4.91 mA/m2) than current density obtained in the control MFC (absence of fungus in the cathode chamber, 20.31±4.30 mA/m2). Maximum Lcc activity (23.08 U/L) and the highest value of organic matter removal (COD) (92%) from domestic wastewater was obtained on the last cycle after biofilm maturation and glycerol pulse. This work evidences that Lcc continuously synthesized by MUM 04.100 immobilized in the biocathode is a promising approach to enhance MFC power performance and wastewater treatment.This work was supported by the SĂŁo Paulo Research Foundation (FAPESP; grant number 2020/12867â2) and Portuguese Foundation for Science and Technology (FCT) under the scope of the strategic funding of UIDB/04469/2020.info:eu-repo/semantics/publishedVersio
Application of microbial fuel cell technology for vinasse treatment and bioelectricity generation
Our study evaluated the performance of different two-chambered microbial fuel cell (MFC) prototypes, operated with variable distance between electrodes and Nafion membrane and specific inoculum concentration, applied for vinasse treatment.Instituto de Pesquisa Tecnológica do Estado de São Paulo/Programa Novos Talentos, through individual Research Grant attributed to Cristiane Angélica Ottoni.info:eu-repo/semantics/publishedVersio
Stability Constraints for Robust Model Predictive Control
This paper proposes an approach for the robust stabilization of systems controlled by MPC strategies. Uncertain SISO linear systems with box-bounded parametric uncertainties are considered. The proposed approach delivers some constraints on the control inputs which impose sufficient conditions for the convergence of the system output. These stability constraints can be included in the set of constraints dealt with by existing MPC design strategies, in this way leading to the ârobustificationâ of the MPC
Avaliação de genĂłtipos de arroz para resistĂȘncia Ă mal-do-pĂ©.
O mal-do-pĂ© causado por Gaeumannomyces graminis var. graminis Ă© uma doença recentemente registrada em arroz de terras altas e irrigado no Brasil. Foi avaliado o grau de resistĂȘncia genĂ©tica Ă mal-do-pĂ© em 58 somaclones de IAC 47 e Araguaia, em casa de vegetação
Population differences in allele frequencies at the OLR1 locus may suggest geographic disparities in cardiovascular risk events.
Abstract
Background: Several studies have demonstrated a link between cardiovascular disease (CVD) susceptibility
and the genetic background of populations.
Endothelial activation and dysfunction induced by oxidized low-density lipoprotein (ox-LDL) is one of
the key steps in the initiation of atherosclerosis. The oxidized low density lipoprotein (lectin-like)
receptor 1 (OLR1) gene is the main receptor of ox-LDL. We have previously characterized two
polymorphisms (rs3736235 and rs11053646) associated with the risk for coronary artery disease
(CAD) and acute myocardial infarction (AMI).
Aim: Given their clinical significance, it is of interest to know the distribution of these variants in
populations from different continents.
Subjects and methods: A total of 1229 individuals from 17 different African, Asian and European
populations was genotyped for the two considered markers.
Results: The high frequencies of ancestral alleles in South-Saharan populations is concordant with the
African origin of our species. The results highlight that African populations are closer to Asians, and
clearly separated from the Europeans.
Conclusion: The results confirm significant genetic structuring among populations and suggest a
possible basis for varying susceptibility to CVD among groups correlated with the geographical
location of populations linked with the migrations out of Africa, or with different lifestyle
Implicit Regularization and Renormalization of QCD
We apply the Implicit Regularization Technique (IR) in a non-abelian gauge
theory. We show that IR preserves gauge symmetry as encoded in relations
between the renormalizations constants required by the Slavnov-Taylor
identities at the one loop level of QCD. Moreover, we show that the technique
handles divergencies in massive and massless QFT on equal footing.Comment: (11 pages, 2 figures
On the equivalence between Implicit Regularization and Constrained Differential Renormalization
Constrained Differential Renormalization (CDR) and the constrained version of
Implicit Regularization (IR) are two regularization independent techniques that
do not rely on dimensional continuation of the space-time. These two methods
which have rather distinct basis have been successfully applied to several
calculations which show that they can be trusted as practical, symmetry
invariant frameworks (gauge and supersymmetry included) in perturbative
computations even beyond one-loop order.
In this paper, we show the equivalence between these two methods at one-loop
order. We show that the configuration space rules of CDR can be mapped into the
momentum space procedures of Implicit Regularization, the major principle
behind this equivalence being the extension of the properties of regular
distributions to the regularized ones.Comment: 16 page
Regularization Independent Analysis of the Origin of Two Loop Contributions to N=1 Super Yang-Mills Beta Function
We present a both ultraviolet and infrared regularization independent
analysis in a symmetry preserving framework for the N=1 Super Yang-Mills beta
function to two loop order. We show explicitly that off-shell infrared
divergences as well as the overall two loop ultraviolet divergence cancel out
whilst the beta function receives contributions of infrared modes.Comment: 7 pages, 2 figures, typos correcte
Hot Exoplanet Atmospheres Resolved with Transit Spectroscopy (HEARTS) VIII. Nondetection of sodium in the atmosphere of the aligned planet KELT-10b
We searched for potential atmospheric species in KELT-10b, focusing on sodium
doublet lines (Na i; 589 nm) and the Balmer alpha line (H ; 656 nm) in
the transmission spectrum. Furthermore, we measured the planet-orbital
alignment with the spin of its host star. We used the Rossiter-McLaughlin
Revolutions technique to analyze the local stellar lines occulted by the planet
during its transit. We used the standard transmission spectroscopy method to
probe the planetary atmosphere, including the correction for telluric lines and
the Rossiter-McLaughlin effect on the spectra. We analyzed two new light curves
jointly with the public photometry observations. We do not detect signals in
the Na i and H lines within the uncertainty of our measurements. We
derive the 3-sigma upper limit of excess absorption due to the planetary
atmosphere corresponding to equivalent height Rp to 1.8Rp (Na i) and 1.9Rp (H
). The analysis of the Rossiter-McLaughlin effect yields the
sky-projected spin-orbit angle of the system = -5.2 3.4 and the
stellar projected equatorial velocity = 2.58 0.12
km/s. Photometry results are compatible within 1 -sigma with previous studies.
We found no evidence of Na i and H , within the precision of our data,
in the atmosphere of KELT-10b. Our detection limits allow us to rule out the
presence of neutral sodium or excited hydrogen in an escaping extended
atmosphere around KELT-10b. We cannot confirm the previous detection of Na i at
lower altitudes with VLT/UVES. We note, however, that the Rossiter-McLaughlin
effect impacts the transmission spectrum on a smaller scale than the previous
detection with UVES. Analysis of the planet-occulted stellar lines shows the
sky-projected alignment of the system, which is likely truly aligned due to
tidal interactions of the planet with its cool (Teff < 6250 K) host star.Comment: Accepted in A&
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