A well-controlled homemade Pt-BaO/Al 2 O 3 monolith catalyst has been used for tuning the operati... more A well-controlled homemade Pt-BaO/Al 2 O 3 monolith catalyst has been used for tuning the operational conditions at which the NO x storage and reduction (NSR) of the lean-burn engine exhaust gases is achieved more efficiently. The following operational conditions have been analyzed: the duration of the lean (storage) period, and the reductant (H 2 ) concentration and duration of the regeneration (rich) period. The storage pattern during the lean period is evaluated by the percentage of NO x stored or NO x trapping efficiency (Á T ), and the performance during the rich period is evaluated by the NO x reduction conversion (X R ) and the selectivity to nitrogen (S N 2 ). These three response variables have been integrated into the single parameter that we have named integral NSR efficiency (ε NSR ) of the whole NSR process, which represents the percentage of N 2 produced at the reactor exit relative to the NO x fed to the reactor. The proposed graphical map consists of a series of ε NSR -isocurves and allows predicting the NSR efficiency for any combination of the three studied operational conditions (C H 2 , t R , t L ). Such operational map shall also be useful to compare the global NSR behavior of commercial catalysts under real operating conditions.
Synthesis in fluoride-containing medium leads to large silicalite crystals without SiOX defect gr... more Synthesis in fluoride-containing medium leads to large silicalite crystals without SiOX defect groups. The four occluded tetrapropylammonium (TPA +) ions/unit cell are ion pairs with 2 Fand 2 OH-. Grinding the samples in the presence of water leads to SiOH groups that are eliminated during calcination. The two endothermic peaks at 420 and 560°C of the TPA + decomposition are identified as being due to the Hoffmann degradation of the TPA ÷ ion (first peak) and to the decomposition of the products of TPA + ion (second peak).
Synthesis in fluoride-containing medium leads to large silicalite crystals without SiOX defect gr... more Synthesis in fluoride-containing medium leads to large silicalite crystals without SiOX defect groups. The four occluded tetrapropylammonium (TPA +) ions/unit cell are ion pairs with 2 Fand 2 OH-. Grinding the samples in the presence of water leads to SiOH groups that are eliminated during calcination. The two endothermic peaks at 420 and 560°C of the TPA + decomposition are identified as being due to the Hoffmann degradation of the TPA ÷ ion (first peak) and to the decomposition of the products of TPA + ion (second peak).
Subinhibitory concentrations (sub-MICs) of antibiotics, although not able to kill bacteria, can m... more Subinhibitory concentrations (sub-MICs) of antibiotics, although not able to kill bacteria, can modify their physico-chemical characteristics and the architecture of their outermost surface and may interfere with some bacterial functions. This study investigated the ability of sub-MIC piperacillin/ tazobactam (P/T) to interfere with the bacterial virulence parameters of adhesiveness, cell-surface hydrophobicity, motility, biofilm formation and sensitivity to oxidative stress. Antimicrobial activity against five Pseudomonas aeruginosa clinical isolates, representative of clonal lineages of 96 strains of nosocomial origin, and six control strains (ATCC 27853, PAO1, AK1, MT1562, PT623, PAO1algC) was evaluated in vitro using the NCCLS microdilution method. The effects of sub-MIC on bacterial adhesion and biofilm formation were studied using a modified microtitre plate assay. The relative cell-surface hydrophobicity of P. aeruginosa strains was determined by measuring their ability to adhere to n-hexadecane. P. aeruginosa that had been exposed overnight to P/T and incubated with P/T in the plate were also screened for their ability to swim using flagella and to twitch and for their sensitivity to oxidative stress. The results obtained showed that the impact of sub-MIC P/T on bacterial characteristics was different for the various strains of P. aeruginosa. There was a change in bacterial morphology and hydrophobicity that could explain a significant decrease in adhesion values in all clinical isolates and controls tested, a decrease in biofilm formation, a significant increase in sensitivity to oxidative stress, a significant decrease in flagellum-mediated swimming and a decrease in type IV fimbriae-mediated twitching. The results obtained indicate that sub-MIC P/T interferes with the pathogenic potential of P. aeruginosa.
SUMÁRIO: Introdução -1. Conceito e evolução do tema -2. Definição legal: 2.1. Definição legal: ví... more SUMÁRIO: Introdução -1. Conceito e evolução do tema -2. Definição legal: 2.1. Definição legal: vítima, alienado e alienador -3. Formas de alienação parental -4. Declaração judicial da alienação parental -Considerações finais -Referências bibliográficas. RESUMO: Este artigo pretende dar um panorama sobre a Lei 12.318/2010, que introduziu no ordenamento jurídico brasileiro a alienação parental, com consequências processuais e sobretudo materiais, notadamente no tocante à guarda de crianças e adolescentes. PALAVRAS-CHAVE: alienação parental -Lei 12.318/2010. INTRODUÇÃO Acaba de ser publicada a Lei 12.318/2010, que regula a "alienação parental" e cujas disposições já eram anunciadas pela doutrina e jurisprudência.
A well-controlled homemade Pt-BaO/Al 2 O 3 monolith catalyst has been used for tuning the operati... more A well-controlled homemade Pt-BaO/Al 2 O 3 monolith catalyst has been used for tuning the operational conditions at which the NO x storage and reduction (NSR) of the lean-burn engine exhaust gases is achieved more efficiently. The following operational conditions have been analyzed: the duration of the lean (storage) period, and the reductant (H 2 ) concentration and duration of the regeneration (rich) period. The storage pattern during the lean period is evaluated by the percentage of NO x stored or NO x trapping efficiency (Á T ), and the performance during the rich period is evaluated by the NO x reduction conversion (X R ) and the selectivity to nitrogen (S N 2 ). These three response variables have been integrated into the single parameter that we have named integral NSR efficiency (ε NSR ) of the whole NSR process, which represents the percentage of N 2 produced at the reactor exit relative to the NO x fed to the reactor. The proposed graphical map consists of a series of ε NSR -isocurves and allows predicting the NSR efficiency for any combination of the three studied operational conditions (C H 2 , t R , t L ). Such operational map shall also be useful to compare the global NSR behavior of commercial catalysts under real operating conditions.
Synthesis in fluoride-containing medium leads to large silicalite crystals without SiOX defect gr... more Synthesis in fluoride-containing medium leads to large silicalite crystals without SiOX defect groups. The four occluded tetrapropylammonium (TPA +) ions/unit cell are ion pairs with 2 Fand 2 OH-. Grinding the samples in the presence of water leads to SiOH groups that are eliminated during calcination. The two endothermic peaks at 420 and 560°C of the TPA + decomposition are identified as being due to the Hoffmann degradation of the TPA ÷ ion (first peak) and to the decomposition of the products of TPA + ion (second peak).
Synthesis in fluoride-containing medium leads to large silicalite crystals without SiOX defect gr... more Synthesis in fluoride-containing medium leads to large silicalite crystals without SiOX defect groups. The four occluded tetrapropylammonium (TPA +) ions/unit cell are ion pairs with 2 Fand 2 OH-. Grinding the samples in the presence of water leads to SiOH groups that are eliminated during calcination. The two endothermic peaks at 420 and 560°C of the TPA + decomposition are identified as being due to the Hoffmann degradation of the TPA ÷ ion (first peak) and to the decomposition of the products of TPA + ion (second peak).
Subinhibitory concentrations (sub-MICs) of antibiotics, although not able to kill bacteria, can m... more Subinhibitory concentrations (sub-MICs) of antibiotics, although not able to kill bacteria, can modify their physico-chemical characteristics and the architecture of their outermost surface and may interfere with some bacterial functions. This study investigated the ability of sub-MIC piperacillin/ tazobactam (P/T) to interfere with the bacterial virulence parameters of adhesiveness, cell-surface hydrophobicity, motility, biofilm formation and sensitivity to oxidative stress. Antimicrobial activity against five Pseudomonas aeruginosa clinical isolates, representative of clonal lineages of 96 strains of nosocomial origin, and six control strains (ATCC 27853, PAO1, AK1, MT1562, PT623, PAO1algC) was evaluated in vitro using the NCCLS microdilution method. The effects of sub-MIC on bacterial adhesion and biofilm formation were studied using a modified microtitre plate assay. The relative cell-surface hydrophobicity of P. aeruginosa strains was determined by measuring their ability to adhere to n-hexadecane. P. aeruginosa that had been exposed overnight to P/T and incubated with P/T in the plate were also screened for their ability to swim using flagella and to twitch and for their sensitivity to oxidative stress. The results obtained showed that the impact of sub-MIC P/T on bacterial characteristics was different for the various strains of P. aeruginosa. There was a change in bacterial morphology and hydrophobicity that could explain a significant decrease in adhesion values in all clinical isolates and controls tested, a decrease in biofilm formation, a significant increase in sensitivity to oxidative stress, a significant decrease in flagellum-mediated swimming and a decrease in type IV fimbriae-mediated twitching. The results obtained indicate that sub-MIC P/T interferes with the pathogenic potential of P. aeruginosa.
SUMÁRIO: Introdução -1. Conceito e evolução do tema -2. Definição legal: 2.1. Definição legal: ví... more SUMÁRIO: Introdução -1. Conceito e evolução do tema -2. Definição legal: 2.1. Definição legal: vítima, alienado e alienador -3. Formas de alienação parental -4. Declaração judicial da alienação parental -Considerações finais -Referências bibliográficas. RESUMO: Este artigo pretende dar um panorama sobre a Lei 12.318/2010, que introduziu no ordenamento jurídico brasileiro a alienação parental, com consequências processuais e sobretudo materiais, notadamente no tocante à guarda de crianças e adolescentes. PALAVRAS-CHAVE: alienação parental -Lei 12.318/2010. INTRODUÇÃO Acaba de ser publicada a Lei 12.318/2010, que regula a "alienação parental" e cujas disposições já eram anunciadas pela doutrina e jurisprudência.
Uploads
Papers by Ale Fonseca