Efeito da fertilização mineral fosfatada na partição das formas de fósforo num Regossolo

PTDC/AGR-PRO/112127/2009: Fitodisponibilidade e riscos ambientais do fósforo aplicado por via de chorumes de pecuária intensiva em solos portugueses.O conhecimento da partição do P no solo por diferentes formas com distinta labilidade, ajuda a perceber a dinâmica do P não só relativamente à sua fitodisponibilidade, como também a riscos de transferência para as águas com consequências negativas na eutrofização. Neste trabalho, efetuou-se a caracterização das formas de P presentes num Regossolo e, após uma adubação mineral fosfatada, avaliou-se o seu efeito sobre a fitodisponibilidade e partição das formas de fósforo. Os resultados obtidos contribuirão para uma melhor gestão do P no solo.FC

Anomalous Stark Shifts in Single Vertically Coupled Pairs of InGaAs Quantum Dots

Vertically coupled Stranski Krastanow QDs are predicted to exhibit strong tunnelling interactions that lead to the formation of hybridised states. We report the results of investigations into single pairs of coupled QDs in the presence of an electric field that is able to bring individual carrier levels into resonance and to investigate the Stark shift properties of the excitons present. Pronounced changes in the Stark shift behaviour of exciton features are identified and attributed to the significant redistribution of the carrier wavefunctions as resonance between two QDs is achieved. At low electric fields coherent tunnelling between the two QD ground states is identified from the change in sign of the permanent dipole moment and dramatic increase of the electron polarisability, and at higher electric fields a distortion of the Stark shift is attributed to a coherent tunnelling effect between the ground state of the upper QD and the excited state of the lower QD.Comment: Conference paper for QD2004 3 figure

Fertilizantes orgânicos : efeito na fertilidade do solo e na produção de azevém

Fertilizantes orgânicos : efeito na fertilidade do solo e na produção de azevém

Ciclo do fósforo em agroecossistemas: Efeito da fertilização fosfatada com adubos minerais ou com resíduos orgânicos de pecuária

Comunicação oral da qual só está disponível o resumo.Ciclo do fósforo em agroecossistemas: Efeito da fertilização fosfatada com adubos minerais ou com resíduos orgânicos de pecuária.Trabalho financiado pelo projeto FCT PTDC/AGRPRO/ 112127/2009, “Assessment of phosphorus bioavailability from animal manures applied to Portuguese soils and site vulnerability to phosphorus losses”, 2011-2013

A Comparison between Dual Phase Steel and Interstitial Free Steel Due To the Springback Effect

International audienceThis is a study of the springback effect on two kinds of high strength steel, which are: dualphase and interstitial free, currently used as feedstock in the production of vehicles. The mechanical characterization of the springback effect was performed by means of a mechanical conformation test, called three-point air bending, performed by adapting it to the unconstrained cylindrical bending test. It was also evaluated the mechanical properties of the material defined by the tensile test in order to determine its tensile strength, yield strength, and elongation. Furthermore, it was performed a microstructural characterization of advanced steels by identifying and quantifying the present phases in coexistence by means of digital image processing. The results indicate that the springback effect in the dual-phase steel has the highest springback rates due to its high mechanical strength, and it causes a decrease in the aspect ratio of the grains that suffered mechanical conformation attempting to return it to its original form. On the other hand, the springback effect has the lowest rates, and the change in aspect ratio depends only on the interstitial free steel elongation capacity due to its lower mechanical strength

Spirometry And Volumetric Capnography In Lung Function Assessment Of Obese And Normal-weight Individuals Without Asthma

To analyze and compare lung function of obese and healthy, normal-weight children and adolescents, without asthma, through spirometry and volumetric capnography. Methods: Cross-sectional study including 77 subjects (38 obese) aged 5-17 years. All subjects underwent spirometry and volumetric capnography. The evaluations were repeated in obese subjects after the use of a bronchodilator. Results: At the spirometry assessment, obese individuals, when compared with the control group, showed lower values of forced expiratory volume in the first second by forced vital capacity (FEV1/FVC) and expiratory flows at 75% and between 25 and 75% of the FVC (p <0.05). Volumetric capnography showed that obese individuals had a higher volume of produced carbon dioxide and alveolar tidal volume (p <0.05). Additionally, the associations between dead space volume and tidal volume, as well as phase-3 slope normalized by tidal volume, were lower in healthy subjects (p <0.05). These data suggest that obesity does not alter ventilation homogeneity, but flow homogeneity. After subdividing the groups by age, a greater difference in lung function was observed in obese and healthy individuals aged >11 years (p <0.05). Conclusion: Even without the diagnosis of asthma by clinical criteria and without response to bronchodilator use, obese individuals showed lower FEV1/FVC values and forced expiratory flow, indicating the presence of an obstructive process. Volumetric capnography showed that obese individuals had higher alveolar tidal volume, with no alterations in ventilation homogeneity, suggesting flow alterations, without affecting lung volumes. © 2017 Sociedade Brasileira de Pediatria

Animal manures applied to soil: phosphorus bioavailability, losses to water and erosion

Comunicação oral da qual só está disponível o resumo.Phosphorus (P) is a non renewable resource which highlights the significance of developing and using alternative sources of P for a sustainable agriculture. Animal manure is an option but its application to soils to meet crop nitrogen needs requires careful management practices to minimize freshwater eutrophication. The aim of this work was to evaluate the partitioning of applied P between plant uptake, losses to water, and erosion losses when using different animal manures and a mineral P fertilizer. A field trial was conducted at an erosion experimental station. The treatments were: Control (0 kg P/ha); cattle manure; solid fraction of pig and duck slurry and superphosphate, each applied at a rate of 50 kg P/ha after Lolium sp was sown. Soil samples from each trial were collected over the 9-month study and the water extractable soil P determined. It was found that desorption of P from all additions rapidly increased soon after P application (2 weeks). After that water extractable soil P remained fairly constant. While duck slurry desorbed the largest concentration of P, all sources have the potential to desorb P that could accelerate eutrophication. Plant uptake of P was greater with cattle manure added and released the least amount of P to water compared with the other sources of P. The partitioning of applied P between plant uptake and losses to runoff and sediments ranged between 5-12 % with the higher values in Duck treatment. Animal manures significantly increased soil Olsen-P, plant production and P uptake relative to mineral fertilizer. Animal manures can be considered as a source of available P nevertheless to avoid eutrophication risks increase plant P use efficiency is also important

Loop bounds on non-standard neutrino interactions

We reconsider the bounds on non-standard neutrino interactions with matter which can be derived by constraining the four-charged-lepton operators induced at the loop level. We find that these bounds are model dependent. Naturalness arguments can lead to much stronger constraints than those presented in previous studies, while no completely model-independent bounds can be derived. We will illustrate how large loop-contributions to four-charged-lepton operators are induced within a particular model that realizes gauge invariant non-standard interactions and discuss conditions to avoid these bounds. These considerations mainly affect the $\mathcal O(10^{-4})$ constraint on the non-standard coupling strength \eps_{e\mu}, which is lost. The only model-independent constraints that can be derived are $\mathcal O(10^{-1})$. However, significant cancellations are required in order to saturate this bound.Comment: Minor changes, version to be published in JHEP. 17 pages, 3 Axodraw figures, REVTeX

Genome-wide identification, characterization and expression profiling of the ubiquitin-proteasome genes in biomphalaria glabrata

Biomphalaria glabrata is the major species used for the study of schistosomiasis-related parasite-host relationships, and understanding its gene regulation may aid in this endeavor. The ubiquitin-proteasome system (UPS) performs post-translational regulation in order to maintain cellular protein homeostasis and is related to several mechanisms, including immune responses. The aims of this work were to identify and characterize the putative genes and proteins involved in UPS using bioinformatic tools and also their expression on different tissues of B. glabrata. The putative genes and proteins of UPS in B. glabrata were predicted using BLASTp and as queries reference proteins from model organism. We characterized these putative proteins using PFAM and CDD software describing the conserved domains and active sites. The phylogenetic analysis was performed using ClustalX2 and MEGA5.2. Expression evaluation was performed from 12 snail tissues using RPKM. 119 sequences involved in the UPS in B. glabrata were identified, which 86 have been related to the ubiquitination pathway and 33 to proteasome. In addition, the conserved domains found were associated with the ubiquitin family, UQ_con, HECT, U-box and proteasome. The main active sites were lysine and cysteine residues. Lysines are responsible and the starting point for the formation of polyubiquitin chains, while the cysteine residues of the enzymes are responsible for binding to ubiquitin. The phylogenetic analysis showed an organized distribution between the organisms and the clades of the sequences, corresponding to the tree of life of the animals, for all groups of sequences analyzed. The ubiquitin sequence was the only one with a high expression profile found in all libraries, inferring its wide range of performance. Our results show the presence, conservation and expression profile of the UPS in this mollusk, providing a basis and new knowledge for other studies involving this system. Due to the importance of the UPS and B. glabrata, this work may influence the search for new methodologies for the control of schistosomiasis114CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ479890/2013-