Kinetic modelling for the photocatalytic degradation of phenol by using TiO2-coated glass raschig rings under simulated solar light

BACKGROUNDImmobilisation of TiO2 photocatalysts has proven to be an efficient technological approach concerning both practical and economical aspects. The efficiency of photocatalytic phenol degradation using glass raschig rings coated with TiO2 Aeroxide((R))P25 was evaluated in a recirculation reactor operating under simulated solar light irradiation, by comparing the first order reaction rate (r) as a function of several operation conditions. RESULTSThe reaction rate increases with the initial phenol concentration ([PhOH](0)), the irradiation intensity (I), the number of TiO2-coated rings (N), and the hydrogen peroxide concentration [H2O2], and is minimally affected by the solution's flow rate (Q). A kinetic model was developed for the determination of the r as a function of the operating parameters. CONCLUSIONSThe empirical model allows the prediction of the efficiency of the photocatalytic degradation process in a wide range of operation conditions, which can be considered a useful tool for the scaling-up of the water treatment process. (c) 2014 Society of Chemical Industr

Traditional medicines in the Rio Negro (Amazona state, Brazil). Observations on the Ethnopharmacology and teh use of the plant Saracura-Mirá ( Ampelozizyphus amazonicus): pharmacogical activity and/or symbolic efficacy.

No Vale do Rio Negro (Amazonas, Brasil), o sistema de saúde local se caracteza por um "pluralismo médico", coexistindo procedimentos terapêuticos heterogêneos, entre eles a fitoterapia. Destacamos o uso da planta saracura-mirá (Ampelozizyphus amazonicus) como estimulante energético. É de uso tradicional entre índios e "caboclos" da região do Rio Negro. Verificamos os fatores intervenientes do processo de cura com a utilização dessa planta (mito. rito, forma, tempo), caracterizando assim, não só o princípio ativo, mas, especialmente, a eficácia simbólica

apnm3801_OFC_Spine.indd

Abstract: The aim of this study was to examine the effect of adding single-joint (SJ) exercises to a multi-joint (MJ) exercise resistance-training program on upper body muscle size and strength. Twenty-nine untrained young men participated in a 10-week training session. They were randomly divided in 2 groups: the MJ group performed only MJ exercises (lat pulldown and bench press); the MJ+SJ group performed the same MJ exercises plus SJ exercises (lat pulldown, bench press, elbow flexion, and elbow extension). Before and after the training period, the muscle thickness (MT) of the elbow flexors was measured with ultrasound, and peak torque (PT) was measured with an isokinetic dynamometer. There was a significant (p < 0.05) increase in MT (6.5% for MJ and 7.04% for MJ+SJ) and PT (10.40% for MJ and 12.85% for MJ+SJ) in both groups, but there were no between-group differences. Therefore, this study showed that the inclusion of SJ exercises in a MJ exercise training program resulted in no additional benefits in terms of muscle size or strength gains in untrained young men

Nanodiamond-TiO2 composites for photocatalytic degradation of microcystin-LA in aqueous solutions under simulated solar light

Titanium dioxide (TiO2) has been under intensive investigation for photocatalytic degradation of cyanobacterial toxins. In order to develop more efficient photocatalysts, TiO2 and oxidized nanodiamonds (NDox) were combined as a composite catalyst (NDox-TiO2), which was tested in the photocatalytic oxidation of microcystin-LA (MC-LA), a cyanotoxin frequently found in freshwater. NDox-TiO2 and neat TiO2 photocatalysts were prepared by a liquid phase deposition method. A wide variety of analytical techniques, including physical adsorption of nitrogen, X-ray diffraction (XRD), UV-Vis and IR diffuse reflectance spectroscopies (DRUV-Vis and DRIFT), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), were used to characterize the materials. The performance of the photocatalysts was studied under both simulated solar and visible light. The kinetic results show remarkable efficiency for the NDox-TiO2 composite under simulated solar light irradiation with a synergistic factor of more than 15 relative to neat TiO2, while negligible photocatalytic activity was observed for the degradation of MC-LA when NDox-TiO2 was used under visible light illumination due to the wide band gap of the composite material. The photocatalytic efficiency of NDox-TiO2 was ascribed to the good dispersion of both phases in the composite material, facilitating the possible electronic interaction at the heterojunction interface between NDox and TiO2

Homenagem Casa dos Estudantes do Império - 50 Anos | Testemunhos, Vivências, Documentos

Os textos incluídos nesta obra são transcrições das intervenções feitas pelos participantes nas diversas sessões da homenagem à Casa dos Estudantes do Império, realizadas entre 2014 e 2015. Estas intervenções foram gravadas através de meios audiovisuais e posteriormente editadas para efeitos de publicação. A presente edição segue a grafia do Acordo Ortográfico, exceto nos casos em que os autores quiseram manter a antiga grafia.CML – Câmara Municipal de Lisboa; Camões – Instituto da Cooperação e da Língua; Fundação Calouste Gulbenkianinfo:eu-repo/semantics/publishedVersio

Brazilian coffee genome project: an EST-based genomic resource

O café é um dos principais produtos agrícolas, sendo considerado o segundo item em importância do comércio internacional de commodities. O gênero Coffea pertence à família Rubiaceae que também inclui outras plantas importantes. Este gênero contém aproximadamente 100 espécies, mas a produção comercial é baseada somente em duas espécies, Coffea arabica e Coffea canephora, que representam aproximadamente 70 % e 30 % do mercado total de café, respectivamente. O Projeto Genoma Café Brasileiro foi desenvolvido com o objetivo de disponibilizar os modernos recursos da genômica à comunidade científica e aos diferentes segmentos da cadeia produtiva do café. Para isso, foram seqüenciados 214.964 clones escolhidos aleatoriamente de 37 bibliotecas de cDNA de C. arabica, C. canephora e C. racemosa representando estádios específicos do desenvolvimento de células e de tecidos do cafeeiro, resultando em 130.792, 12.381 e 10.566 seqüências de cada espécie, respectivamente, após processo de trimagem. Os ESTs foram agrupados em 17.982 contigs e em 32.155 singletons. A comparação destas seqüências pelo programa BLAST revelou que 22 % não tiveram nenhuma similaridade significativa às seqüências no banco de dados do National Center for Biotechnology Information (de função conhecida ou desconhecida). A base de dados de ESTs do cafeeiro resultou na identificação de cerca de 33.000 unigenes diferentes. Os resultados de anotação das seqüências foram armazenados em base de dados online em http://www.lge.ibi.unicamp.br/cafe. Os recursos desenvolvidos por este projeto disponibilizam ferramentas genéticas e genômicas que podem ser decisivas para a sustentabilidade, a competitividade e a futura viabilidade da agroindústria cafeeira nos mercados interno e externo.Coffee is one of the most valuable agricultural commodities and ranks second on international trade exchanges. The genus Coffea belongs to the Rubiaceae family which includes other important plants. The genus contains about 100 species but commercial production is based only on two species, Coffea arabica and Coffea canephora that represent about 70 % and 30 % of the total coffee market, respectively. The Brazilian Coffee Genome Project was designed with the objective of making modern genomics resources available to the coffee scientific community, working on different aspects of the coffee production chain. We have single-pass sequenced a total of 214,964 randomly picked clones from 37 cDNA libraries of C. arabica, C. canephora and C. racemosa, representing specific stages of cells and plant development that after trimming resulted in 130,792, 12,381 and 10,566 sequences for each species, respectively. The ESTs clustered into 17,982 clusters and 32,155 singletons. Blast analysis of these sequences revealed that 22 % had no significant matches to sequences in the National Center for Biotechnology Information database (of known or unknown function). The generated coffee EST database resulted in the identification of close to 33,000 different unigenes. Annotated sequencing results have been stored in an online database at http://www.lge.ibi.unicamp.br/cafe. Resources developed in this project provide genetic and genomic tools that may hold the key to the sustainability, competitiveness and future viability of the coffee industry in local and international markets