5,842 research outputs found
Thin film-based sensors
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Stability of the transthyretin molecule as a key factor in the interaction with a-beta peptide--relevance in Alzheimer's disease
Transthyretin (TTR) protects against A-Beta toxicity by binding the peptide thus inhibiting its aggregation. Previous work
showed different TTR mutations interact differently with A-Beta, with increasing affinities correlating with decreasing
amyloidogenecity of the TTR mutant; this did not impact on the levels of inhibition of A-Beta aggregation, as assessed by
transmission electron microscopy. Our work aimed at probing differences in binding to A-Beta by WT, T119M and L55P TTR
using quantitative assays, and at identifying factors affecting this interaction. We addressed the impact of such factors in
TTR ability to degrade A-Beta. Using a dot blot approach with the anti-oligomeric antibody A11, we showed that A-Beta
formed oligomers transiently, indicating aggregation and fibril formation, whereas in the presence of WT and T119M TTR
the oligomers persisted longer, indicative that these variants avoided further aggregation into fibrils. In contrast, L55PTTR
was not able to inhibit oligomerization or to prevent evolution to aggregates and fibrils. Furthermore, apoptosis assessment
showed WT and T119M TTR were able to protect against A-Beta toxicity. Because the amyloidogenic potential of TTR is
inversely correlated with its stability, the use of drugs able to stabilize TTR tetrameric fold could result in increased TTR/ABeta
binding. Here we showed that iododiflunisal, 3-dinitrophenol, resveratrol, [2-(3,5-dichlorophenyl)amino] (DCPA) and [4-
(3,5-difluorophenyl)] (DFPB) were able to increase TTR binding to A-Beta; however only DCPA and DFPB improved TTR
proteolytic activity. Thyroxine, a TTR ligand, did not influence TTR/A-Beta interaction and A-Beta degradation by TTR,
whereas RBP, another TTR ligand, not only obstructed the interaction but also inhibited TTR proteolytic activity. Our results
showed differences between WT and T119M TTR, and L55PTTR mutant regarding their interaction with A-Beta and prompt
the stability of TTR as a key factor in this interaction, which may be relevant in AD pathogenesis and for the design of
therapeutic TTR-based therapies
Sub-shot-noise photon-number correlation in mesoscopic twin-beam of light
We demonstrate sub-shot-noise photon-number correlations in a (temporal)
multimode mesoscopic ( detected photons) twin-beam produced by
ps-pulsed spontaneous non-degenerate parametric downconversion. We have
separately detected the signal and idler distributions of photons collected in
twin coherence areas and found that the variance of the photon-count difference
goes below the shot-noise limit by 3.25 dB. The number of temporal modes
contained in the twin-beam, as well as the size of the twin coherence areas,
depends on the pump intensity. Our scheme is based on spontaneous
downconversion and thus does not suffer from limitations due to the finite gain
of the parametric process. Twin-beams are also used to demonstrate the
conditional preparation of a nonclassical (sub-Poissonian) state.Comment: 5 pages, 5 (low-res) figures, to appear on PR
Creating shared value in Rock in Rio business model: case study
This discourse will attempt to discuss `Creation of Shared Value' (CSV) through the case study of the music festival "Rock in Rio" (RIR) in order to further understand the company's sustainability program. The main goal is to clearly recognize if RIR uses a genuine practice of CSV to accomplish their social policies. To commence, we started with the State of Art, studying the CSV theory created by Porter and Kramer, as well as the authors that were either in support of, or against, the strategy. Qualitative Research Method was used, thus focusing the enterprise case study, by analysing media interviews given by the managerial staff of RIR. Content analysis was used to process data and deliver results. The main limitation of the study was the lack of institutional information, due to an absence of responses, to the survey in sufficient time by RIR's managers, subsequently a triangulation of the information acquired could not be achieved.info:eu-repo/semantics/acceptedVersio
A Knowledge Based System for Supporting Sustainable Industrial Management in a Clothes Manufacturing Company Based on a Data Fusion Model
In this paper we propose a knowledge based system (KBS), based on smart objects and a data fusion model to support industrial management decision making applied to a clothes manufacturing enterprise. The management processes cover factory-production levels to higher decision-making levels. Therefore, the proposed KBS contributes to solving different kind of decision problems, including factory supervision, production planning and control, productivity management, real-time monitoring, and data acquisition and processing. The web access via different middleware devices and tools at different process levels, along with the use of integrated algorithms, decision methods, and smart objects, promote an optimized use of knowledge and resources. In this paper the proposed KBS is introduced and an example of its use is illustrated with an example of a clothes manufacturing resources selection, using the embedded dynamic multi-criteria fusion model.This work was supported by FCT “Fundação para a Ciência e a Tecnologia” under the program: PEST2015-2020, reference: UID/CEC/00319/2013.info:eu-repo/semantics/publishedVersio
Zircon dating and inheritance of a pre-Variscan granite, SW Iberia
The Portalegre pluton is an aligned series of Pre-Variscan
granitoids located along the boundary of the Central Iberian/
Ossa Morena Zones (SW Iberian Massif, Portugal). Singlezircon
geochronology (U-Pb SHRIMP and Pb/Pb stepwise
evaporation) yield an Upper Cambrian/Lower Ordovician age
(492.7 ± 3.5 Ma) interpreted as the magmatic crystallization
age. The inherited zircon cores indicate the involvement of
sources with a wide range age-components: an important Late
Neoproterozoic (548 ± 7 Ma and c. 611-681 Ma) population
and a Mesoproterozoic (c. 0.95-1.1 Ga) and older (c. 2.6 Ga)
components. Younger zircon ages of 358 ± 36 and 387 ± 7 Ma
were also found and interpreted as the record of a Variscan
metamorphic event. The presence of Grenvillian zirconforming
events in the protholiths of Portalegre granites is
significant in the regional geodynamic context of the Iberian
Massif (Central Iberian affinity?). At present, the Grenvillian
ages are not noticeable in the Late Neoproterozoic/Early
Cambrian record of the Ossa-Morena Zone, that has been
correlated with West African Craton [1]. These data suggests
that the Central Iberian Zone and Ossa-Morena Zone were
independent peri-gondwana terrains with diferent
paleogeographic affinities before the Ordovician times. The
overall chemistry for the Portalegre granites shows they are
very differentiated (SiO2=74-76 wt %), peraluminous
(A/CNK=1.1–1.4); have low Zr=36-125ppm, Th/Ta=2-10,
ΣREE= 22-134 and 1000Ga/Al >3. Their isotopic signatures
(87Sr/86Sr)493=0.7050-0.7065, εNd493(-2.88 to -0.85) and
δ18O=10.5-10.8‰, are compatible with partial melting of
relatively young recycled metaigneous ± enriched mantle
sources. The age pattern from the inherited zircon cores in the
Portalegre granites shows that the late Neoproterozoic age
(Cadomian) basement was actively involved in their magma
generation. The Grenvillian and Archaean zircons can be
accounted for by that source component but they do not imply
the presence of an older pre-Neoproterozoic basement rocks
beneath SW Iberia
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