Rosa, IM.
2013.
Evaluation of the effect of hearing aids using electroencephalographic analysis. Enterprise and Work Innovation Studies. 9(9):29-38.
AbstractWe wonder how it is possible to use the Electroencephalogram (EEG) as a TA instrument, rather than a diagnosis procedure, to evaluate how children hear the sounds. The first concern was related to the definition of concepts, namely the primary and secondary objectives, the importance of the study, the materials and equipment, the procedures, the criteria for inclusion and exclusion and the expected outcomes. We present the main research questions, the proposed methodology and report the first steps of the practical work, some results and a few considerations about the thesis next development.
Maia, MJ.
2013.
Foresight Exercises as a tool for decision-making: the example of two case studies in health. Enterprise and Work Innovation Studies. 9(9):39-66.
AbstractHealthcare systems are characterized by a rapid technology push and demand. Most decisions taken in this field usually are accompanied by risk and uncertainties. Due to financial constrains (common in every healthcare system), all decision must be made based on evidences of reliable studies. It may be not possible to know the future needs of healthcare systems in general, but it should be possible to foreseen them. This paper aims to shed some light on how prospective analysis can be an adding tool for the decision-making process, by enhancing exploratory and strategic dimension of planning and managing in a sensitive field such as healthcare. In order to provide for a simple overview on foresight exercises applied to health, this paper presents two study-cases that applied different methods. Since different foresight methods were applied, a comparative case-study analysis was applied, taking into consideration the following aspects of the exercise: aim, methodology, stakeholders and outputs. The specific objectives of this report are: to explore the usage of foresight methods applied to healthcare level in two different countries and therefore to understand if there are any similarities in the approach; and based on the analysis results, to develop recommendations for healthcare level decision-making in general. The results of this report can be useful for a better understanding on how foresight methods can be applied in healthcare and their importance. This article can help healthcare professionals, providing them a glimpse of some steps on the use of these foresight methods, so they can be more alert for foresight methodological framework and their practical applications. The knowledge on how to apply foresight methodology can be a differential and potential asset of a well-organized and informed institution, as well as an asset for a shared and participative strategic planning.
Dantas, JM, Tomaz DM, Morgado L, Salgueiro CA.
2013.
Functional characterization of PccH, a key cytochrome for electron transfer from electrodes to the bacterium Geobacter sulfurreducens. FEBS Letters. 587(16):2662-2668.
AbstractThe cytochrome PccH from Geobacter sulfurreducens (Gs) plays a crucial role in current-consuming fumarate-reducing biofilms. Deletion of pccH gene inhibited completely electron transfer from electrodes toward Gs cells. The pccH gene was cloned and the protein heterologously expressed in Escherichia coli. Complementary biophysical techniques including CD, UV-visible and NMR spectroscopy were used to characterize PccH. This cytochrome contains one low-spin c-type heme with His-Met axial coordination and unusual low-reduction potential. This reduction potential is pH-dependent, within the Gs physiological pH range, and is discussed within the context of the electron transfer mechanisms from electrodes to Gs cells.
Barroso, T, Hussain A, Roque ACA, Aguiar‐Ricardo A.
2013.
Functional monolithic platforms: Chromatographic tools for antibody purification. Biotechnology journal. 8(6):671–681.
AbstractPolymer monoliths are an efficient platform for antibody purification. The use of monoclonal antibodies (mAbs) and engineered antibody structures as therapeutics has increased exponentially over the past few decades. Several approaches use polymer monoliths to purify large quantities of antibody with defined clinical and performance requirements. Functional monolithic supports have attracted a great deal of attention as they offer practical advantages for antibody purification, such as more rapid analysis, smaller sample volume requirements and the opportunity for a greater target molecule enrichment. This review focuses on the development of synthetic and natural polymer-based monoliths for antibody purification. The materials and methods employed in monolith production are discussed, highlighting the properties of each system. We also review the structural characterization techniques available using monolithic systems and their performance under different chromatographic approaches to antibody capture and release. Finally, a summary of monolithic platforms developed for antibody separation is presented, as well as expected trends in research to solve current and future challenges in this field. This review comprises a comprehensive analysis of proposed solutions highlighting the remarkable potential of monolithic platforms.
Alves R.D., L.C. R, J.R. A, Fernandes M., Pinto J.V., L. P, Pawlicka A., R. M, Fortunato E., Bermudez V.D., M.M. S.
2013.
GelatinnZn(CF3SO3)2 Polymer Electrolytes for Electrochromic Devices. Electroanalysis. 25(6):1483-1490.
Rodrigues, R, Grosso AR, Moita L.
2013.
Genome-wide analysis of alternative splicing during dendritic cell response to a bacterial challenge. PloS one. 8:e61975., Number 4
AbstractThe immune system relies on the plasticity of its components to produce appropriate responses to frequent environmental challenges. Dendritic cells (DCs) are critical initiators of innate immunity and orchestrate the later and more specific adaptive immunity. The generation of diversity in transcriptional programs is central for effective immune responses. Alternative splicing is widely considered a key generator of transcriptional and proteomic complexity, but its role has been rarely addressed systematically in immune cells. Here we used splicing-sensitive arrays to assess genome-wide gene- and exon-level expression profiles in human DCs in response to a bacterial challenge. We find widespread alternative splicing events and splicing factor transcriptional signatures induced by an E. coli challenge to human DCs. Alternative splicing acts in concert with transcriptional modulation, but these two mechanisms of gene regulation affect primarily distinct functional gene groups. Alternative splicing is likely to have an important role in DC immunobiology because it affects genes known to be involved in DC development, endocytosis, antigen presentation and cell cycle arrest.
Franco, R, Pereira E.
2013.
Gold Nanoparticles and Proteins, Interactions. Encyclopedia of Metalloproteins. (
Kretsinger, R.H., Uversky, V.N., Permyakov, E.A., Eds.).:908-915., New York: Springer Science+Business Media
Carvalho, S, Raposo AC, Martins FB, Grosso AR, Sridhara SC, Rino J, Carmo-fonseca M, de Almeida SF.
2013.
Histone methyltransferase SETD2 coordinates FACT recruitment with nucleosome dynamics during transcription. Nucleic acids research. 41:2881–93., Number 5
AbstractHistone H3 of nucleosomes positioned on active genes is trimethylated at Lys36 (H3K36me3) by the SETD2 (also termed KMT3A/SET2 or HYPB) methyltransferase. Previous studies in yeast indicated that H3K36me3 prevents spurious intragenic transcription initiation through recruitment of a histone deacetylase complex, a mechanism that is not conserved in mammals. Here, we report that downregulation of SETD2 in human cells leads to intragenic transcription initiation in at least 11% of active genes. Reduction of SETD2 prevents normal loading of the FACT (FAcilitates Chromatin Transcription) complex subunits SPT16 and SSRP1, and decreases nucleosome occupancy in active genes. Moreover, co-immunoprecipitation experiments suggest that SPT16 is recruited to active chromatin templates, which contain H3K36me3-modified nucleosomes. Our results further show that within minutes after transcriptional activation, there is a SETD2-dependent reduction in gene body occupancy of histone H2B, but not of histone H3, suggesting that SETD2 coordinates FACT-mediated exchange of histone H2B during transcription-coupled nucleosome displacement. After inhibition of transcription, we observe a SETD2-dependent recruitment of FACT and increased histone H2B occupancy. These data suggest that SETD2 activity modulates FACT recruitment and nucleosome dynamics, thereby repressing cryptic transcription initiation.
Cerff, M, Scholz A, Franzreb M, Batalha IL, Roque ACA, Posten C.
2013.
In situ magnetic separation of antibody fragments from Escherichia coli in complex media. BMC biotechnology. 13(1):44.
AbstractBackground
In situ magnetic separation (ISMS) has emerged as a powerful tool to overcome process constraints such as product degradation or inhibition of target production. In the present work, an integrated ISMS process was established for the production of his-tagged single chain fragment variable (scFv) D1.3 antibodies (?D1.3?) produced by E. coli in complex media. This study investigates the impact of ISMS on the overall product yield as well as its biocompatibility with the bioprocess when metal-chelate and triazine-functionalized magnetic beads were used.
Results
Both particle systems are well suited for separation of D1.3 during cultivation. While the triazine beads did not negatively impact the bioprocess, the application of metal-chelate particles caused leakage of divalent copper ions in the medium. After the ISMS step, elevated copper concentrations above 120?mg/L in the medium negatively influenced D1.3 production. Due to the stable nature of the model protein scFv D1.3 in the biosuspension, the application of ISMS could not increase the overall D1.3 yield as was shown by simulation and experiments.
Conclusions
We could demonstrate that triazine-functionalized beads are a suitable low-cost alternative to selectively adsorb D1.3 fragments, and measured maximum loads of 0.08?g D1.3 per g of beads. Although copper-loaded metal-chelate beads did adsorb his-tagged D1.3 well during cultivation, this particle system must be optimized by minimizing metal leakage from the beads in order to avoid negative inhibitory effects on growth of the microorganisms and target production. Hereby, other types of metal chelate complexes should be tested to demonstrate biocompatibility. Such optimized particle systems can be regarded as ISMS platform technology, especially for the production of antibodies and their fragments with low stability in the medium. The proposed model can be applied to design future ISMS experiments in order to maximize the overall product yield while the amount of particles being used is minimized as well as the number of required ISMS steps.
Grazina, R, Pauleta S, Moura JJG, Moura I.
2013.
Iron-sulfur centers: New roles for ancient metal sites. Comprehensive Inorganic Chemistry II, Vol. 3: Bioinorganic Fundamentals and Applications: Metals in Natural Living Systems and Metals in Toxicology and Medicine. :103-148., Oxford: Elsevier
Borlido, L, Azevedo AM, Roque ACA, Aires-Barros MR.
2013.
Magnetic separations in biotechnology. Biotechnology Advances. 31(8):1374-1385.
AbstractMagnetic separations are probably one of the most versatile separation processes in biotechnology as they are able to purify cells, viruses, proteins and nucleic acids directly from crude samples. The fast and gentle process in combination with its easy scale-up and automation provide unique advantages over other separation techniques. In the midst of this process are the magnetic adsorbents tailored for the envisioned target and whose complex synthesis spans over multiple fields of science. In this context, this article reviews both the synthesis and tailoring of magnetic adsorbents for bioseparations as well as their ultimate application.
Marcelo, F, Dias C, Madeira PJ, Jorge T, Florêncio HM, Canada JF, Cabrita EJ, Jiménez-Barbero J, Rauter AP.
2013.
Molecular Recognition of Rosmarinic Acid from Salvia sclareoides Extracts by Acetylcholinesterase: A New Binding Site Detected by NMR Spectroscopy. Chemistry: A European Journal. 19(21):6641–6649.
AbstractAcetylcholinesterase (AChE) inhibition is one of the most currently available therapies for the management of Alzheimer’s disease (AD) symptoms. In this context, NMR spectroscopy binding studies were accomplished to explain the inhibition of AChE activity by Salvia sclareoides extracts. HPLC-MS analyses of the acetone, butanol and water extracts eluted with methanol and acidified water showed that rosmarinic acid is present in all the studied samples and is a major constituent of butanol and water extracts. Moreover, luteolin 4′-O-glucoside, luteolin 3′,7-di-O-glucoside and luteolin 7-O-(6′′-O-acetylglucoside) were identified by MS2 and MS3 data acquired during the LC-MSn runs. Quantification of rosmarinic acid by HPLC with diode-array detection (DAD) showed that the butanol extract is the richest one in this component (134 μg mg−1 extract). Saturation transfer difference (STD) NMR spectroscopy binding experiments of S. sclareoides crude extracts in the presence of AChE in buffer solution determined rosmarinic acid as the only explicit binder for AChE. Furthermore, the binding epitope and the AChE-bound conformation of rosmarinic acid were further elucidated by STD and transferred NOE effect (trNOESY) experiments. As a control, NMR spectroscopy binding experiments were also carried out with pure rosmarinic acid, thus confirming the specific interaction and inhibition of this compound against AChE. The binding site of AChE for rosmarinic acid was also investigated by STD-based competition binding experiments using Donepezil, a drug currently used to treat AD, as a reference. These competition experiments demonstrated that rosmarinic acid does not compete with Donepezil for the same binding site. A 3D model of the molecular complex has been proposed. Therefore, the combination of the NMR spectroscopy based data with molecular modelling has permitted us to detect a new binding site in AChE, which could be used for future drug development.