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Bianca Lucas-Granados,Rita Sánchez-Tovar,Ramón M. Fernández-Domene,José García-Antón 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.70 No.-
In photoelectrochemistry, a suitable photoanode leading to high efficiencies in photocatalytic processesis a research challenge. Iron oxide nanostructures are promising materials to be used as photoanodes. Inthis work, different potentials during iron anodization were applied to study the properties of thesynthesized nanostructures. Results revealed that nanostructures anodized at 50 V presentedwell-defined nanotubular structures with open-tube tops, and they achieved values of photocurrentdensity of 0.11 mA cm 2 at 0 rpm and 0.14 mA cm 2 at 1000 rpm (measured at 0.50 VAg/AgCl),corresponding to the oxygen evolution reaction from water, i.e. 2H2O + 4 h+→ 4H+ + O2, demonstratingtheir good photoelectrochemical behavior.
Thermal properties and curing kinetics of epoxy powder coatings containing graphene nanoplatelets
Andrielen Braz Vanzetto,Lucas Dall Agnol,Alessandra Lavoratti,Marcos Vinícius Marocco,Gabriel Gonem de Lima,Lilian Vanessa Rossa Beltrami,Ademir José Zattera,Diego Piazza 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.9
Graphene nanoplatelets (GNP) have excellent properties, such as high mechanical strength and good thermal conductivity, making them interesting nanofiller for their application in powder coatings. In this context, the aim of this study was to evaluate the thermal behavior and the curing kinetics of epoxy powder coatings containing GNP. The coatings were obtained by mixing in a ball mill followed by homogenization in molten state. The GNP were dispersed directly into the epoxy powder. The morphology, thermal stability and curing kinetics of the samples were evaluated. During the curing process, the GNP accelerated the onset of the reaction but ultimately caused steric impediment. From the results, the GNP incorporated to the solid epoxy resin for coatings behaved differently in each stage of the curing process. In general, while the direct dispersion of GNP in powder epoxy by dry mixing methods was not ideal, the thermal properties were improved, with GNP inducing a poor curing state where diffusion phenomena are predominant.
Bruna Carolina Dorm,José Alberto Paris Junior,Lucas Henrique Domingos da Silva,Lucimara Aparecida Forato,Tamires de Souza Nossa,Antonio José Felix Carvalho,Flávia Aparecida Resende,Alessandro Gandini 한국고분자학회 2024 Macromolecular Research Vol.32 No.2
The click chemistry reactions and its use in living organisms have been widely developed; however, few studies describe the safety of the reagents and products. Furan–maleimide represent one important pair of reagents for the click Diels–Alder reaction, and were chosen here to perform the minimalist click reaction with cysteine to reveal their preliminary safety features by cytotoxicity tests. The functional groups of amino acids allow them to be chemically modified, mainly for the synthesis of monomers and polymers. Here, cysteine was used in the click reaction, since it displays an SH group in its side chain, useful to perform thiol–ene reactions. Its amine group easily reacts with anhydrides, allowing it to couple with the furan derivative “furan–maleic anhydride adduct”. The mixture of the cysteine with the adduct in solution gives rise to the double simultaneous thiol–ene/amine maleimide click reactions. The thiol group and the furan double bond provide the reactive functional groups for the polymerization. The synthesis of the polymer based on cysteine–Diels–Alder adduct confirmed the condensation nature of the reaction. Preliminary safety and biocompatibility tests of this new polymer and its starting reagents were carried out, since these parameters represent one of the most important features for operating and scaling up the production. This one-step double-click reaction is interesting for application in several fields, since it has the advantage of using natural and renewable raw materials, in addition to its handling safety.
Ricardo Cavani,Marcela da Silva Rubio,Khauston Augusto Pereira Alves,Lucas José, Luduverio Pizauro,Marita Vedovelli Cardozo,Paulo Lourenç,o Silva,Iran José, Oliveira Silva,Fernando Antô,nio Avila 한국축산식품학회 2022 한국축산식품학회지 Vol.42 No.1
Brazil is considered as a great broiler feet exporter;especially for the Chinese trade. Contact lesions at the tibiotarsal region are responsible for economic losses and there is no model for its classification;thereby this study presents a fast and practical grade system to be used in the poultry industry and proposes these lesion characterizations into three different grades. For this;correlation was made between macroscopic;histological findings and microbiological quantification (Escherichia coli;Staphylococcus spp.;Streptococcus spp. and sulphite-reducing clostridia) from contact lesions in the tibiotarsal region of 112 broiler carcasses;divided in four groups (n=28);accordingly to the lesion’s intensity. There were no significant differences in microbiological quantification among the groups (p>0.05) except for the grade 3 group;as grade 1 and 2 lesions were in the early stages and histopathological changes such as ulceration were not observed. In grade 3 lesion group;it was observed bacterial cocci grume and ulceration at the articular region and significantly higher microbiological count (p<0.05) for E. coli and Staphylococcus spp. In conclusion;the visual standard proposed in this work;correlated and confirmed by the histopathologic;and microbiologic characterization;allows to precise and fast ascertainment of the contact lesion grade in the tibiotarsal regions of broiler carcasses. Moreover;it should be highlighted that grades 1 and 2 alterations are not caused by an inflammatory process caused by pathogenic agents and should not be considered a public health risk.
Ricardo Cavani,Marcela da Silva Rubio,Khauston Augusto Pereira Alves,Lucas José Luduverio Pizauro,Marita Vedovelli Cardozo,Paulo Lourenço Silva,Iran José Oliveira Silva,Fernando Antônio Avila 한국축산식품학회 2022 한국축산식품학회지 Vol.42 No.2
Brazil is considered as a great broiler feet exporter, especially for the Chinese trade. Contact lesions at the tibiotarsal region are responsible for economic losses and there is no model for its classification, thereby this study presents a fast and practical grade system to be used in the poultry industry and proposes these lesion characterizations into three different grades. For this, correlation was made between macroscopic, histological findings and microbiological quantification (Escherichia coli, Staphylococcus spp., Streptococcus spp. and sulphite-reducing clostridia) from contact lesions in the tibiotarsal region of 112 broiler carcasses, divided in four groups (n=28), accordingly to the lesion’s intensity. There were no significant differences in microbiological quantification among the groups (p>0.05) except for the grade 3 group, as grade 1 and 2 lesions were in the early stages and histopathological changes such as ulceration were not observed. In grade 3 lesion group, it was observed bacterial cocci grume and ulceration at the articular region and significantly higher microbiological count (p<0.05) for E. coli and Staphylococcus spp. In conclusion, the visual standard proposed in this work, correlated and confirmed by the histopathologic, and microbiologic characterization, allows to precise and fast ascertainment of the contact lesion grade in the tibiotarsal regions of broiler carcasses. Moreover, it should be highlighted that grades 1 and 2 alterations are not caused by an inflammatory process caused by pathogenic agents and should not be considered a public health risk.
Pleiotropic effects of enhancing vacuolar K/H exchange in tomato
De Luca, Anna,Pardo, José,M.,Leidi, Eduardo O. Blackwell Publishing Ltd 2018 Physiologia Plantarum Vol.163 No.1
<P>Cation antiporters of the NHX family are widely regarded as determinants of salt tolerance due to their capacity to drive sodium (Na) and sequester it into vacuoles. Recent work shows, however, that NHX transporters are primarily involved in vacuolar potassium (K) storage. Over‐expression of the K/H antiporter AtNHX1 in tomato increases K accumulation into vacuoles and plant sensitivity to K deprivation. Here we show that the appearance of early leaf symptoms of K deficiency was associated with higher concentration of polyamines. Transgenic roots exhibited a greater sensitivity than shoots to K deprivation with changes in the composition of the free amino acids pool, total sugars and organic acids. Concentrations of amides (glutamine), amino acids (arginine) and sugars significantly increased in root, together with a reduction in malate and succinate concentrations. The concentration of pyruvate and the activity of pyruvate kinase were greater in the transgenic roots before K withdrawal although both parameters were depressed by K deprivation and approached wild‐type levels. In the longer term, the over‐expression of the NHX1 antiporter affected root growth and biomass partitioning (shoot/root ratio). Greater ethylene release produced longer stem internodes and leaf curling in the transgenic line. Our data show that enhanced sequestration of K by the NHX antiporter in the vacuoles altered cellular K homeostasis and had deeper physiological consequences than expected. Early metabolic changes lead later on to profound morphological and physiological adjustments resulting eventually in the loss of nutrient use efficiency.</P>
Cryogenic photoluminescence imaging system for nanoscale positioning of single quantum emitters
Liu, Jin,Davanç,o, Marcelo I.,Sapienza, Luca,Konthasinghe, Kumarasiri,De Miranda Cardoso, José,Viní,cius,Song, Jin Dong,Badolato, Antonio,Srinivasan, Kartik American Institute of Physics 2017 Review of scientific instruments Vol.88 No.2