Kinetin and Nitrogen in Agronomic Characteristics of Soybean

The objective of this work was to evaluate the application of kinetin associated with nitrogen in coverage on the agronomic characteristics and soybean yield. In the 2016/2017 harvest, a 6x2 factorial scheme was used, six doses of kinetin (0; 0.30; 0.60; 0.90; 1.20; 1.50 g ha−1) and two doses of N (20 and 40 kg ha−1) and in the 2017/2018 harvest, factorial scheme 5x2 was used, five doses of kinetin   (0; 0.25; 0.75; 1.00; 1.25 g ha−1) and two doses of N (20 and 40 kg ha−1). Agronomic plant height characteristics, first pod insertion height, number of grains per plant, number of pods per plant, number of grains per pod, number of grains per pod, hundred-grain mass and grain yield were evaluated. The use of N alone and associated with kinetin increased the number of pods and grains in the 2016/2017 harvest. In the 2017/2018 crop, kinetin caused a reduction of 8.9% at plant height and N caused an increase in plant height and first pod insertion and reduced the number of pods and grains per plant, grains per pods and productivity

Só nós e Santa Tecla

[Extrato] Numa tarde de Outubro entrevistámos Sergio Fernandez na sua casa de Caminha. Tínhamos a recordação da obra enquanto estudantes e, após uma década de casa imaginada na memória, repetiu-se o conforto dos tectos baixos, a relação das funções internas e a paisagem deslumbrante, o fascínio de uma arquitectura

Understanding the mechanisms controlling Leishmania amazonensis infection In vitro: the role of LTB4 derived from human neutrophils.

Submitted by Ana Maria Fiscina Sampaio ([email protected]) on 2014-09-15T17:55:50Z No. of bitstreams: 1 Tavares NM Understanding the mechanisms.....pdf: 856640 bytes, checksum: 51c5935f5e761744af4ab01f86804777 (MD5)Approved for entry into archive by Ana Maria Fiscina Sampaio ([email protected]) on 2014-09-15T17:56:05Z (GMT) No. of bitstreams: 1 Tavares NM Understanding the mechanisms.....pdf: 856640 bytes, checksum: 51c5935f5e761744af4ab01f86804777 (MD5)Made available in DSpace on 2014-09-15T18:10:54Z (GMT). No. of bitstreams: 1 Tavares NM Understanding the mechanisms.....pdf: 856640 bytes, checksum: 51c5935f5e761744af4ab01f86804777 (MD5) Previous issue date: 2014Fundação Oswaldo Cruz. Centro de Pesquisa Gonçalo Moniz. Salvador, BA, Brasil / Universidade Federal da Bahia. Salvador, BA, BrasilFundação Oswaldo Cruz. Centro de Pesquisa Gonçalo Moniz. Salvador, BA, Brasil / Universidade Federal da Bahia. Salvador, BA, BrasilFundação Oswaldo Cruz. Centro de Pesquisa Gonçalo Moniz. Salvador, BA, BrasilFundação Oswaldo Cruz. Centro de Pesquisa René Rachou. Belo Horizonte, MG, BrasilFederal University of Rio de Janeiro. UFRJ.Carlos Chagas Filho Institute. Rio de Janeiro, RJ, BrasilFundação Oswaldo Cruz. Centro de Pesquisa René Rachou. Belo Horizonte, MG, BrasilFundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Imunofarmacologia. Rio de Janeiro, RJ, BrasilFederal University of Rio de Janeiro. UFRJ.Carlos Chagas Filho Institute. Rio de Janeiro, RJ, BrasilFundação Oswaldo Cruz. Centro de Pesquisa Gonçalo Moniz. Salvador, BA, Brasil / Universidade Federal da Bahia. Salvador, BA, Brasil / National Institute of Science and Technology for Immunology Investigation (iii–INCT). Salvador, BA, BrasilFundação Oswaldo Cruz. Centro de Pesquisa Gonçalo Moniz. Salvador, BA, Brasil / Universidade Federal da Bahia. Salvador, BA, Brasil / National Institute of Science and Technology for Immunology Investigation (iii–INCT). Salvador, BA, BrasilNeutrophils are rapidly recruited to the site of Leishmania infection and play an active role in capturing and killing parasites. They are the main source of leukotriene B4 (LTB4), a potent proinflammatory lipid mediator. However, the role of LTB4 in neutrophil infection by Leishmania amazonensis is not clear. In this study, we show that L. amazonensis or its lipophosphoglycan can induce neutrophil activation, degranulation, and LTB4 production. Using pharmacological inhibitors of leukotriene synthesis, our findings reveal an LTB4-driven autocrine/ paracrine regulatory effect. In particular, neutrophil-derived LTB4 controls L. amazonensis killing, degranulation, and reactive oxygen species production. In addition, L. amazonensis infection induces an early increase in Toll-like receptor 2 expression, which facilitates parasite internalization. Nuclear factor kappa B (NFkB) pathway activation represents a required upstream event for L. amazonensis–induced LTB4 synthesis. These leishmanicidal mechanisms mediated by neutrophil-derived LTB4 act through activation of its receptor, B leukotriene receptor 1 (BLT1

Ethyl acetate abatement on copper catalysts supported on ceria doped with rare earth oxides

Different lanthanide (Ln)-doped cerium oxides (Ce(0.5)Ln(0.5)O(1.75), where Ln: Gd, La, Pr, Nd, Sm) were loaded with Cu (20 wt. %) and used as catalysts for the oxidation of ethyl acetate (EtOAc), a common volatile organic compound (VOC). For comparison, both Cu-free (Ce-Ln) and supported Cu (Cu/Ce-Ln) samples were characterized by N-2 adsorption at -196 degrees C, scanning/transmission electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy and temperature programmed reduction in H-2. The following activity sequence, in terms of EtOAc conversion, was found for bare supports: CeO2 approximate to Ce0.5Pr0.5O1.75 > Ce0.5Sm0.5O1.75 > Ce0.5Gd0.5O1.75 > Ce0.5Nd0.5O1.75 > Ce0.5La0.5O1.75. Cu addition improved the catalytic performance, without affecting the activity order. The best catalytic performance was obtained for Cu/CeO2 and Cu/Ce0.5Pr0.5O1.75 samples, both achieving complete EtOAc conversion below ca. 290 degrees C. A strong correlation was revealed between the catalytic performance and the redox properties of the samples, in terms of reducibility and lattice oxygen availability. No particular correlation between the VOC oxidation performance and textural characteristics was found. The obtained results can be explained in terms of a Mars-van Krevelen type redox mechanism involving the participation of weakly bound (easily reduced) lattice oxygen and its consequent replenishment by gas phase oxygen

Optimization of N2O decomposition activity of CuO-CeO2 mixed oxides by means of synthesis procedure and alkali (Cs) promotion

Summarization: The fine-tuning of local surface chemistry of CuO-CeO2 mixed oxides by means of synthesis procedure and alkali promotion towards the rational design of highly active catalysts is investigated. In particular, the impact of alkali (Cs) promotion on the N2O decomposition activity (deN2O process) of CuO-ceria mixed oxides, pre-optimized through the preparation procedure (co-precipitation among different synthesis routes), is explored. It was found that the co-optimization of the synthesis procedure (co-precipitation) and alkali loading (1.0 at Cs per nm2) can boost the decomposition of N2O and resistance to O2 inhibition, offering a half-conversion temperature (T50) ca. 200 °C lower, when compared to a reference CuO-CeO2 sample. A complementary characterization study involving surface area determination (BET method), pore size distribution (BJH method), X-ray diffraction (XRD), H2 temperature-programmed reduction (H2-TPR) and X-ray photoelectron spectroscopy (XPS) was undertaken to gain insight into structure-property relationships. The results revealed that the superiority of Cs-doped samples can be mainly attributed to the electronic effect of the alkali promoter towards the stabilization of partially reduced Cu+/Ce3+ pairs, which play a key role in the deN2O process following a redox-type mechanism.Presented on: Catalysis Science and Technolog

Catalytic decomposition of N2O on inorganic oxides: effect of doping with Au nanoparticles

Summarization: The aim of this work is to explore the influence of the support (MxOy: Al2O3, CeO2, Fe2O3, TiO2 and ZnO) on the physicochemical characteristics and the N2O decomposition (deN2O) performance of supported gold nanoparticles (Au/MxOy). Both the bare oxides and the Au/oxide catalysts were characterized by several methods (BET, XRD, SEM, HR-TEM, XPS and H2-TPR) and comparatively evaluated in order to gain insight into the structure-property relationships. A close correlation between the catalytic performance and the redox properties (reducibility and oxygen mobility) of oxide carriers was revealed on the basis of a redox type mechanism, resulting in the following deN2O activity order: Fe2O3 >> CeO2 > ZnO > TiO2 > Al2O3. In contrast, no significant effect of textural/structural characteristics on the deN2O performance was found. Addition of gold to the oxides facilitates the surface oxygen reduction and, consequently, the deN2O performance, without, however, affecting the activity order. When oxygen is in excess in the feed stream (N2O + O2) a slight inhibition was observed for all samples, due to the competitive adsorption of both reactants on the catalyst surface. On the basis of a kinetic analysis the superior performance of Fe2O3-based samples can be attributed to the optimum compromise between the activation energy and the pre-exponential factor under the present conditions.Presented on: Molecular Catalysi