1,758 research outputs found
Estudio médico deontológico del embarazo ectópico
Dentro de la temática general del aborto, el trabajo se
centra hoy en el estudio moral del tratamiento médico del
embarazo ectópico. El tema adquiere importancia si tenemos
en cuenta que, según sea el enfoque y la solución que se dé
a este problema, se abre o no un camino para la justificación
moral del llamado 'aborto terapéutico'.
Nos planteamos el problema de si la intervención quirúrgica
por la cual se extirpa un embarazo ectópico, y de la
que resulta la muerte del embrión o feto no viable, debe ser
considerada, desde el punto de vista moral, como un aborto
directo y por consiguiente nunca y bajo ninguna razón o necesidad
se puede permitir, o como un aborto indirecto y por
ende lícito en determinadas condiciones
Thin-Film Metamaterials called Sculptured Thin Films
Morphology and performance are conjointed attributes of metamaterials, of
which sculptured thin films (STFs) are examples. STFs are assemblies of
nanowires that can be fabricated from many different materials, typically via
physical vapor deposition onto rotating substrates. The curvilinear--nanowire
morphology of STFs is determined by the substrate motions during fabrication.
The optical properties, especially, can be tailored by varying the morphology
of STFs. In many cases prototype devices have been fabricated for various
optical, thermal, chemical, and biological applications.Comment: to be published in Proc. ICTP School on Metamaterials (Augsut 2009,
Sibiu, Romania
Solubility of caffeic acid in CO2 + ethanol: experimental and predicted data using Cubic Plus Association Equation of State
This work evaluated the solubility of caffeic acid (CA) in mixtures of supercritical carbon dioxide (scCO2) and ethanol at different temperatures (313, 323 and 333 K), pressures (20, 30 and 40 MPa) and concentrations of ethanol (2.2, 5.4 and 10.2 mol%). The Soave-Redlich-Kwong and Cubic Plus Association (CPA) equations of state were used to correlate the binary mixture data and to predict the ternary system data. CA solubility in ethanol is approximately 106 times higher than its solubility in pure scCO2. By using 10.2 mol% ethanol in scCO2, CA solubility increased 30,000 times at 313 K and 20 MPa. Both models provided reasonable descriptions of the experimental data for the binary systems. However, CPA-EoS can better describe the strong interactions between acid molecules and ethanol, and can predict that the addition of small amounts of ethanol to scCO2 provides a large increase in CA solubility.publishe
Multivariate geostatistical analysis of stable isotopes in Portuguese varietal extra virgin olive oils
Stable isotope contents of carbon, hydrogen and oxygen are known to reflect the geo-climatic conditions under
which olives grown. This study aims to unravel the correlation between some of the main geographic variables
and the isotopic composition of different Portuguese varietal extra virgin olive oil (EVOO) samples. Thus, the
isotopic composition (δ13C, δ18O and δ2H) of 38 EVOO samples from 11 olive varieties from 2 Portuguese
regions (Alentejo and Trás-os-Montes) was studied using an elemental analyzer coupled to an isotope ratio mass
spectrometry. Multivariate analysis indicated that bulk δ13C, δ2H and δ18O values were enough to significantly
(P < 0.05) predict altitude, latitude, longitude, temperature, rainfall, and sea distance. This work showed that
the assessment of EVOO isotopic composition give information not only on the geographic origin, but also on the
environmental conditions. To the best of our knowledge, this is the first report on bulk isotopic composition of
Portuguese EVOOs.This work was funded by European Regional Development Fund
(FEDER) and National Funds through Foundation for Science and
Technology (FCT) under Project “Por3O - Portuguese Olive Oil Omics
for traceability and authenticity - PTDC/AGRPRO/2003/2014, and by
National Funds through FCT - Foundation for Science and Technology
under the Projects UIDB/05183/2020 and UID/AGR/00690/2019.
Pedro N. Jiménez-Morillo is acknowledged for statistical assistance.info:eu-repo/semantics/publishedVersio
Metal and semimetal loadings in sediments and water from mangrove ecosystems: A preliminary assessment of anthropogenic enrichment in São Tomé island (central Africa)
Mangroves act as buffer areas for marine systems, providing a barrier to contamination from continental sources by retaining metal pollutants. This study evaluates metal and semimetal contamination in the water column and sediments of four mangroves located on the volcanic island of São Tomé. Several metals had a widespread distribution, with occasional high concentrations, linked to potential sources of contamination. However, the two smaller mangroves, located in the northern part of the island, tended to have high metal concentrations. Arsenic and chromium concentrations were notably concerning, particularly if we consider this is an isolated and non-industrialized island. This work highlights the need for further assessments and a better understanding of processes and implications of metal contamination in mangroves. This assumes a particular relevance in areas that have specific geochemical compositions (i.e., volcanic origin) and in developing countries, where people often rely directly and heavily on resources obtained from these ecosystems.info:eu-repo/semantics/publishedVersio
Reversible cerebral vasoconstriction syndrome induced by adrenaline
Reversible cerebral vasoconstriction syndrome (RCVS) is
characterized by acute severe thunderclap headaches and evidence of multifocal,
segmental, reversible vasoconstrictions of the cerebral arteries. Several
precipitating factors have been identified and reported, including the use of
recreational substances or sympathomimetic drugs and the postpartum state. Case
description: Here we present the case of a woman who developed RCVS after the
administration of adrenaline (epinephrine) in the setting of an anaphylactic
reaction during antibiotic allergy testing. Discussion: To our knowledge, this is
the first reported case of RCVS following the administration of exogenous
adrenaline. This case contributes to the understanding of the physiopathological
mechanisms underlying reversible cerebral vasoconstrictio
Changes in the heart rate variability in patients with obstructive sleep apnea and its response to acute CPAP treatment
Obstructive Sleep Apnea (OSA) is a major risk factor for
cardiovascular disease. The goal of this study was to demonstrate whether the use
of CPAP produces significant changes in the heart rate or in the heart rate
variability of patients with OSA in the first night of treatment and whether
gender and obesity play a role in these differences. METHODS: Single-center
transversal study including patients with severe OSA corrected with CPAP. Only
patients with total correction after CPAP were included. Patients underwent two
sleep studies on consecutive nights: the first night a basal study, and the
second with CPAP. We also analyzed the heart rate changes and their relationship
with CPAP treatment, sleep stages, sex and body mass index. Twenty-minute
segments of the ECG were selected from the sleep periods of REM, no-REM and
awake. Heart rate (HR) and heart rate variability (HRV) were studied by comparing
the R-R interval in the different conditions. We also compared samples from the
basal study and CPAP nights. RESULTS: 39 patients (15 females, 24 males) were
studied. The mean age was 50.67 years old, the mean AHI was 48.54, and mean body
mass index was 33.41 kg/m(2) (31.83 males, 35.95 females). Our results showed
that HRV (SDNN) decreased after the use of CPAP during the first night of
treatment, especially in non-REM sleep. Gender and obesity did not have any
influence on our results. CONCLUSIONS: These findings support that cardiac
variability improves as an acute effect, independently of gender or weight, in
the first night of CPAP use in severe OSA patients, supporting the idea of
continuous use and emphasizing that noncompliance of CPAP treatment should be
avoided even if it is just once
Topological Features in Ion Trap Holonomic Computation
Topological features in quantum computing provide controllability and noise
error avoidance in the performance of logical gates. While such resilience is
favored in the manipulation of quantum systems, it is very hard to identify
topological features in nature. This paper proposes a scheme where holonomic
quantum gates have intrinsic topological features. An ion trap is employed
where the vibrational modes of the ions are coherently manipulated with lasers
in an adiabatic cyclic way producing geometrical holonomic gates. A crucial
ingredient of the manipulation procedures is squeezing of the vibrational
modes, which effectively suppresses exponentially any undesired fluctuations of
the laser amplitudes, thus making the gates resilient to control errors.Comment: 9 pages, 4 figures, REVTE
Design for FDM of flexible tooling for manufacturing aeronautical components by incremental sheet forming
IOP Conf. Series: Materials Science and Engineering 1193Nowadays, industrial production is required to reduce industrialization times and
development costs for new products while maintaining high quality standards. In this context,
the development of new flexible manufacturing technologies has gained relevance in the last few
years. The use of Fused Deposition Modelling (FDM) additive technique has been recently
proposed in different industrial sectors for manufacturing rapid tooling (dies) to be used in
conventional sheet metal stamping or stretching processes with a significant decrease in costs
and time savings. On the other hand, Incremental Sheet Forming (ISF) technology is
characterized by an enhanced formability of the parts thus manufactured as well as for the need
of a small number of tooling, reducing costs compared to conventional processes such as
hydroforming or stamping. In particular, its simplest variant, Single-Point Incremental Forming
(SPIF) requires the use of backing plates, which do not require tight tolerances as their only
function is to collaborate in the deformation process acting as a support point. Furthermore, the
strength requirements are also not a limitation since the forces involved in SPIF are very small
given the local nature of the deformation. In this context, the main objective of this work is the
design of a modular tooling system, manufactured using the FDM additive technique, that allows
the flexible manufacturing of different aeronautical components by SPIF.Universidad de Sevilla US-1263138Ministerio de Ciencia e Innovación (MICIN). España PGC2018-095508-B-I00Junta de Andalucía P18-RT-386
Integrating belowground carbon dynamics into Yield-SAFE, a parameter sparse agroforestry model
Agroforestry combines perennial woody elements (e.g. trees) with an agricultural understory (e.g. wheat, pasture) which can also potentially be used by a livestock component. In recent decades, modern agroforestry systems have been proposed at European level as land use alternatives for conventional agricultural systems. The potential range of benefits that modern agroforestry systems can provide includes farm product diversification (food and timber), soil and biodiversity conservation and carbon sequestration, both in woody biomass and the soil. Whilst typically these include benefits such as food and timber provision, potentially, there are benefits in the form of carbon sequestration, both in woody biomass and in the soil. Quantifying the effect of agroforestry systems on soil carbon is important because it is one means by which atmospheric carbon can be sequestered in order to reduce global warming. However, experimental systems that can combine the different alternative features of agroforestry systems are difficult to implement and long-term. For this reason, models are needed to explore these alternatives, in order to determine what benefits different combinations of trees and understory might provide in agroforestry systems. This paper describes the integration of the widely used soil carbon model RothC, a model simulating soil organic carbon turnover, into Yield-SAFE, a parameter sparse model to estimate aboveground biomass in agroforestry systems. The improvement of the Yield-SAFE model focused on the estimation of input plant material into soil (i.e. leaf fall and root mortality) while maintaining the original aspiration for a simple conceptualization of agroforestry modeling, but allowing to feed inputs to a soil carbon module based on RothC. Validation simulations show that the combined model gives predictions consistent with observed data for both SOC dynamics and tree leaf fall. Two case study systems are examined: a cork oak system in South Portugal and a poplar system in the UK, in current and future climate. (c) 2017, Springer Science+Business Media B.V.European Commission through the AGFORWARD FP7 research Project (contract 613520), Forest Research Center strategic Project (PEst OE/AGR/UI0239/2014), the Portuguese Foundation for Science and Technology (FCT) fellowships SFRH/BD/52691/2014 and SFRH/BPD/96475/2013, XUNTA DE GALICIA, Consellería de Cultura, Educación e Ordenación Universitaria (“Programa de axudas á etapa posdoutoral”) (contract ED481B 2016/071-0
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