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Search Results: 1 - 10 of 208586 matches for " L. Foresti "
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Data-driven exploration of orographic enhancement of precipitation
L. Foresti, M. Kanevski,A. Pozdnoukhov
Advances in Science and Research (ASR) , 2011, DOI: 10.5194/asr-6-129-2011
Abstract: This study presents a methodology to analyse orographic enhancement of precipitation using sequences of radar images and a digital elevation model. Image processing techniques are applied to extract precipitation cells from radar imagery. DEM is used to derive the topographic indices potentially relevant to orographic precipitation enhancement at different spatial scales, e.g. terrain convexity and slope exposure to mesoscale flows. Two recently developed machine learning algorithms are then used to analyse the relationship between the repeatability of precipitation patterns and the underlying topography. Spectral clustering is first used to characterize stratification of the precipitation cells according to different mesoscale flows and exposure to the crest of the Alps. At a second step, support vector machine classifiers are applied to build a computational model which discriminates persistent precipitation cells from all the others (not showing a relationship to topography) in the space of topographic conditioning factors. Upwind slopes and hill tops were found to be the topographic features leading to precipitation repeatability and persistence. Maps of orographic enhancement susceptibility can be computed for a given flow, topography and forecasted smooth precipitation fields and used to improve nowcasting models or correct windward and leeward biases in numerical weather prediction models.
Desenvolvimento e exigências térmicas de Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae) em ovos de Bonagota cranaodes (Meyrick) (Lepidoptera: Tortricidae)
Fonseca, Fabiana L. da;Kovaleski, Adalecio;Foresti, Josemar;Ringenberg, Rudiney;
Neotropical Entomology , 2005, DOI: 10.1590/S1519-566X2005000600011
Abstract: the aim of this study was to evaluate the development of trichogramma pretiosum riley on eggs of bonagota cranaodes (meyrick) under different temperatures. b. cranaodes eggs were maintained under seven constant temperatures (14, 18, 20, 22, 25, 28 and 30oc), 70 ± 10% r.h. and, 14 h l. forty replicates with 20 parasitized eggs each were kept in glass tubes (8.5 x 2.5 cm) covered with a plastic film. the method of hyperbole was used to calculate the temperature threshold (tb) and the thermal constant (k). the tb obtained was 11.9oc and to thermal constant was 153,4 dd. the most favorable temperature range was from 25oc to 30oc, at which the shortest egg-adult development period and the highest survivorship were observed.
Foresti Gian Luca,Ramponi Giovanni,Regazzoni Carlo,Sicuranza Giovanni L
EURASIP Journal on Advances in Signal Processing , 2004,
Effect of mixing mode on the behavior of an ASBBR with immobilized biomass in the treatment of cheese whey
Damasceno, L. H. S.;Rodrigues, José A. D.;Ratusznei, S. M.;Zaiat, M.;Foresti, E.;
Brazilian Journal of Chemical Engineering , 2008, DOI: 10.1590/S0104-66322008000200008
Abstract: a hydrodynamic study of a mechanically stirred anaerobic sequencing batch biofilm reactor (asbbr) containing immobilized biomass on polyurethane foam was performed with the aim to determine homogeneity of the reactor based on total mixing time. turbine or helix propellers were used for stirring at rotor speeds of 100, 200, 300 and 500 rpm. experimental values obtained were fitted to a boltzmann sigmoid. homogenization times of the reactor were negligible when compared to the 8-h cycle time for all conditions studied. at low propeller rotations the turbine propeller showed the best performance. for higher rotations total mixing times were similar for both propellers; however the helix propeller had better homogeneity conditions. at a subsequent stage the system was operated in batch mode treating cheese whey at concentrations of 500, 1000 and 2000 mgcod/l and rotations of 200, 300 and 500 rpm. in these assays the importance of the propeller became evident not only for mixing, but also for substrate flow across the bed containing immobilized biomass. due to axial flow, the helix propeller offered better mass transfer conditions, evidenced by improved organic matter conversion and lower production of total volatile acids.
Development and evaluation of a radial anaerobic/aerobic reactor treating organic matter and nitrogen in sewage
Garbossa, L. H. P.;Lapa, K. R.;Zaiat, M.;Foresti, E.;
Brazilian Journal of Chemical Engineering , 2005, DOI: 10.1590/S0104-66322005000400003
Abstract: the design and performance of a radial anaerobic/aerobic immobilized biomass (raaib) reactor operating to remove organic matter, solids and nitrogen from sewage are discussed. the bench-scale raaib was divided into five concentric chambers. the second and fourth chambers were packed with polyurethane foam matrices. the performance of the reactor in removing organic matter and producing nitrified effluent was good, and its configuration favored the transfer of oxygen to the liquid mass due to its characteristics and the fixed polyurethane foam bed arrangement in concentric chambers. partial denitrification of the liquid also took place in the raaib. the reactor achieved an organic matter removal efficiency of 84%, expressed as chemical oxygen demand (cod), and a total kjeldahl nitrogen (tkn) removal efficiency of 96%. average cod, nitrite and nitrate values for the final effluent were 54 mg.l-1, 0.3 mg.l-1 and 22.1 mg.l-1, respectively.
Assessment of the ability of sludge to degrade PCP under anaerobic conditions
Bola?os, R. M. L.;Damianovic, M. H. R. Z.;Zaiat, M.;Foresti, E.;
Brazilian Journal of Chemical Engineering , 2005, DOI: 10.1590/S0104-66322005000400014
Abstract: the capacity of sludge from different sources to degrade pentachlorophenol (pcp) was evaluated. three 2.5 liter reactors (r1, r2, and r3) were inoculated with different anaerobic sludges, semi continuously fed and maintained in orbital motion at 30±1°c. r1 was inoculated with aerobic sludge and river sediment collected downstream from a pulp and paper plant. r2 received sludge from an anaerobic reactor treating effluents from a paper recycling plant and r3 received anaerobic sludge from a biodigestor treating industrial and domestic effluents. the sludges were first acclimatized to a culture medium generally recommended for organochloride anaerobic degradation studies. the reactors were then subjected to increasing concentrations of pcp from 0.05 to 10.0 mg.l-1. pcp degradation and metabolite formation were monitored using gas chromatography, and the effects of pcp on the anaerobic process were verified by monitoring ph, volatile fatty acids, alkalinity, total suspended solids, and chemical oxygen demand. it was found that pcp did not affect reactor performance. all the sludges displayed the best pcp degradation capacity at a concentration of 0.2 mg.l-1, producing fewer chlorinated metabolites than when higher pcp concentrations were applied. r1 consistently produced fewer chlorinated metabolites, confirming the hypothesis that pre exposure to chlorinated compounds improves the sludge's capacity to degrade pcp.
Analysis of Familial Hemophagocytic Lymphohistiocytosis Type 4 (FHL-4) Mutant Proteins Reveals that S-Acylation Is Required for the Function of Syntaxin 11 in Natural Killer Cells
Andrew L. Hellewell, Ombretta Foresti, Nicola Gover, Morwenna Y. Porter, Eric W. Hewitt
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0098900
Abstract: Natural killer (NK) cell secretory lysosome exocytosis and cytotoxicity are impaired in familial hemophagocytic lymphohistiocytosis type 4 (FHL-4), a disorder caused by mutations in the gene encoding the SNARE protein syntaxin 11. We show that syntaxin 11 binds to SNAP23 in NK cells and that this interaction is reduced by FHL-4 truncation and frameshift mutation proteins that delete all or part of the SNARE domain of syntaxin 11. In contrast the FHL-4 mutant proteins bound to the Sec-1/Munc18-like (SM) protein Munc18-2. We demonstrate that the C-terminal cysteine rich region of syntaxin 11, which is deleted in the FHL-4 mutants, is S-acylated. This posttranslational modification is required for the membrane association of syntaxin 11 and for its polarization to the immunological synapse in NK cells conjugated to target cells. Moreover, we show that Munc18-2 is recruited by syntaxin 11 to intracellular membranes in resting NK cells and to the immunological synapse in activated NK cells. This recruitment of Munc18-2 is abolished by deletion of the C-terminal cysteine rich region of syntaxin 11. These results suggest a pivotal role for S-acylation in the function of syntaxin 11 in NK cells.
Arnaldo Sarti,Eugenio Foresti
Holos Environment , 2009,
Abstract: This paper presents and discusses the potential for use of pilot-scale anaerobic sequencing batch biofilm reactors (ASBBR) for the treatment of industrial wastewater containing high sulfate concentration. The pilot-scale ASBBR reactor (total volume=1.2 m3) containing biomass immobilized in inert support (mineral coal) was operated at sulfate loading rates varying from 0.15 to 1.90 kgSO4-2/cycle (cycle of 48h) corresponding to sulfate concentrations of 0.25 to 3.0 gSO4-2.L-1. Domestic sewage and ethanol were utilized as electron donors for sulfate reduction. The mean sulfate removal efficiencies remained in the range of 88 to 92% in the several sulfate concentrations obtained from 92 operational cycles. As post-treatment unit for the generated effluents by the sulfate reduction was used another reactor ASBBR in pilot-scale (total volume=385,0 L) with same inert support for biomass immobilization and different granulometry. The mean COD removal (mean influent=1450 mg.L-1) achieved 88% and total sulfide concentrations (H2S, HS , S2 ) remained in the range of 41 to 71 mg.L-1 during the 35 operational cycles of 48 h. The results demonstrated that the use of ASBBR reactors is an alternative potential for the sulfate removal and as post-treatment of generated effluent. = Este trabalho apresenta e discute o potencial de uso de reatores anaeróbios operados em bateladas seqüenciais com biomassa imobilizada (ASBBR), em escala piloto, no tratamento de água residuária industrial contendo elevadas concentra es de sulfato. No ASBBR, com volume total de 1,2 m3, preenchido com carv o mineral (meio suporte) foram aplicadas cargas de sulfato de 0,15 a 1,90 kg/ciclo com dura o de ciclo de 48 h, correspondendo, respectivamente, às concentra es de sulfato no afluente de 0,25 a 3,0 g.L-1. O esgoto sanitário e etanol foram usados como doadores de elétrons para a redu o do sulfato. As eficiências médias na redu o de sulfato ficaram entre 88 e 92% nos 92 ciclos operacionais. Como pós-tratamento dos efluentes gerados pela redu o de sulfato empregou-se outro reator ASBBR com volume total de 385,0 L e mesmo meio suporte para imobiliza o da biomassa, mas com diferente granulometria. A remo o média de DQO (valor médio afluente: 1450 mg.L-1) foi de 88%, enquanto as concentra es de sulfetos totais (H2S, HS , S2 ) mantiveram-se entre a faixa de 41 e 71 mg.L-1 nos 35 ciclos operacionais de 48h. Os resultados obtidos permitiram concluir que o uso de reatores ASBBR constitui-se em potencial alternativa tanto para a remo o de sulfatos, como no pós-tratamento dos efluentes gerados.
Acoustophoretic Waltz: a Contactless Exothermal Reaction
Daniele Foresti,Dimos Poulikakos
Physics , 2013, DOI: 10.1063/1.4893545
Abstract: The fluid dynamics video shows the acoustophoretic handling of a metal sodium chunks and a water droplets before, during and after mixing. The violent exothermal reaction between solid and liquid introduces an additional phase (hydrogen gas). We developed a unique concept for using ultrasound to stably levitated and move along a plane multiple objects in air, independently from their electromagnetic nature and aspect ratio. This contactless material handling can be extended to hazardous, chemical or radioactive samples.
Chemokine CCL2 and its receptor CCR2 are increased in the hippocampus following pilocarpine-induced status epilepticus
Maira L Foresti, Gabriel M Arisi, Khurshed Katki, Andres Monta?ez, Russell M Sanchez, Lee A Shapiro
Journal of Neuroinflammation , 2009, DOI: 10.1186/1742-2094-6-40
Abstract: SE was induced by pilocarpine injection. Control rats were injected with saline instead of pilocarpine. Five days after SE, CCR2 staining in neurons and glial cells was examined using imunohistochemical analyses. The number of CCR2 positive cells was determined using stereology probes in the hippocampus. CCL2 expression in the hippocampus was examined by molecular assay.Increased CCR2 was observed in the hippocampus after SE. Seizures also resulted in alterations to the cell types expressing CCR2. Increased numbers of neurons that expressed CCR2 was observed following SE. Microglial cells were more closely apposed to the CCR2-labeled cells in SE rats. In addition, rats that experienced SE exhibited CCR2-labeling in populations of hypertrophied astrocytes, especially in CA1 and dentate gyrus. These CCR2+ astroctytes were not observed in control rats. Examination of CCL2 expression showed that it was elevated in the hippocampus following SE.The data show that CCR2 and CCL2 are up-regulated in the hippocampus after pilocarpine-induced SE. Seizures also result in changes to CCR2 receptor expression in neurons and astrocytes. These changes might be involved in detrimental neuroplasticity and neuroinflammatory changes that occur following seizures.Chemokines are chemotactic cytokines that direct the migration of cells that express the appropriate chemokine receptor. Chemokine C-C motif ligand 2 (CCL2) is a potent attractant protein for monocytes, therefore being previously denominated monocyte chemoattractant protein-1 (MCP-1). The biological effects of CCL2 are mediated via interactions with its receptor, chemokine C-C motif receptor 2 (CCR2). CCR2 is a G protein-coupled receptor and has also been designated as CD192, CC-CKR-2; CKR2; CMKBR2; MCP-1-R. Upon binding to CCR2, CCL2 regulates the migration and infiltration of monocytes, T-lymphocytes and natural killer cells to regions of inflammation [1-3]. Studies using CCL2 and CCR2 knockout mice have shown that this ligand
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