Multiple and Precessing Collimated Outflows in the Planetary Nebula IC 4634

With its remarkable double-S shape, IC 4634 is an archetype of point-symmetric planetary nebulae (PN). In this paper, we present a detailed study of this PN using archival HST WFPC2 and ground-based narrow-band images to investigate its morphology, and long-slit spectroscopic observations to determine its kinematics and to derive its physical conditions and excitation. The data reveal new structural components, including a distant string of knots distributed along an arc-like feature 40"-60" from the center of the nebula, a skin of enhanced [O III]/H-alpha ratio enveloping the inner shell and the double-S feature, and a triple-shell structure. The spatio-kinematical study also finds an equatorial component of the main nebula that is kinematically independent from the bright inner S-shaped arc. We have investigated in detail the bow shock-like features in IC 4634 and found that their morphological, kinematical and emission properties are consistent with the interaction of a collimated outflow with surrounding material. Indeed, the morphology and kinematics of some of these features can be interpreted using a 3D numerical simulation of a collimated outflow precessing at a moderate, time-dependent velocity. Apparently, IC 4634 has experienced several episodes of point-symmetric ejections oriented at different directions with the outer S-shaped feature being related to an earlier point-symmetric ejection and the outermost arc-like string of knots being the relic of an even much earlier point-symmetric ejection. There is tantalizing evidence that the action of these collimated outflows has also taken part in the shaping of the innermost shell and inner S-shaped arc of IC 4634.Comment: 16 pages, 11 figures, accepted for publication in The Astrophysical Journa

Somatic embryogenesis and plant regeneration in açaí palm (Euterpe oleracea).

Made available in DSpace on 2018-07-01T01:23:45Z (GMT). No. of bitstreams: 1 ScherwinskiPereira2012ArticleSomaticEmbryogenesisAndPlantRe.pdf: 490424 bytes, checksum: f61985361005a58dd8b71374dc38aac6 (MD5) Previous issue date: 2013-02-21bitstream/item/179316/1/Scherwinski-Pereira2012-Article-SomaticEmbryogenesisAndPlantRe.pd

Cultura organizacional e o bem-estar dos terapeutas ocupacionais Portugueses

Mestrado em Gestão e Avaliação de Tecnologias em SaúdeO comportamento individual e organizacional são influenciados pela cultura organizacional que configura as formas distintas de expressão e de interação social, que explicam hábitos, costumes e crenças, partilhados pelos membros do mesmo grupo. O presente estudo tem como objetivo principal verificar se a cultura organizacional influencia o bem-estar no trabalho percecionado pelos terapeutas ocupacionais. Pretende-se ainda perceber se as características pessoais e profissionais destes profissionais de saúde, influenciam o seu Bem-Estar no Trabalho. Por último, pretende-se identificar a dimensão que mais contribui para o Bem-Estar no Trabalho. Para a recolha de dados foi realizada por meio de um questionário online constituído por duas secções: a primeira incluiu o Organizacional Culture Assessment Instrument (OCAI) e a segunda, o questionário Bem-Estar no Trabalho para Profissionais de Saúde (BET-Prof.Saúde). A análise dos dados obtidos foi realizada através de análise estatística descritiva de tendência central, por meio do cálculo de frequências, percentagens, médias e desvio padrão, de modo a poder-se caracterizar a amostra e de testes paramétricos (T-Student, Correlação de Spearman, Oneway A-Nova). Foi ainda utilizada a Regressão Linear para análise do modelo de Bem-Estar no Trabalho. Obteve-se uma amostra de 147 participantes, dos quais 88% eram do sexo feminino e 22% do sexo masculino, com idade compreendida entre os 22 e os 63 anos (m=35,20; ± dp=9,648). Tendo em conta os resultados obtidos, concluiu-se que a cultura organizacional, mais precisamente as culturas de Clã e Adocrática, estão associadas positivamente a melhores níveis de Bem-Estar no Trabalho e que o inverso acontece quando predominam as culturas Hierárquica e de Mercado. As dimensões Engagement, Suporte Social e Clima de Equipa, podem ser influenciadas pelas características profissionais dos indivíduos (local de trabalho, tipo de contrato e função de chefia) e são as que mais se relacionam de forma positiva e significativa com o Bem-Estar no Trabalho.ABSTRACT - Individual and organizational behavior are influenced by the organizational culture that shapes the different forms of expression and social interaction that explain habits, customs, and beliefs shared by members of the same group. The main objective of this study is to verify if the organizational culture influences the well-being of work perceived by the occupational therapists. It is also intended to understand if the personal and professional characteristics of these health professionals influence their well-being at work. Finally, it is intended to identify the dimension that contributes most to Well-being at Work. Data collection was done through an online questionnaire consisting of two sections: the first included the Organizational Culture Assessment Instrument (OCAI) and the second, the questionnaire Bem-Estar no Trabalho para Profissionais de Saúde (BET-Prof.saúde). The analysis of the data obtained was performed through a descriptive statistical analysis of central tendency, by means of the calculation of frequencies, percentages, means and standard deviation, in order to be able to characterize the sample and of parametric tests (T-Student, Spearman Correlation, Oneway A-Nova). Linear Regression was also used to analyze the well-being model at work. A sample of 147 participants was obtained, of which 88% were female and 22% male, aged between 22 and 63 years (m = 35,20; ± DP = 9,648). Considering the results obtained, it was concluded that the organizational culture, more precisely the cultures of Clã and Adhocratic, is positively associated with better levels of well-being at work and that the opposite occurs when Hierarchical and Market cultures predominate. The Engagement, Social Support, and Team Climate dimensions can be influenced by the individual’s professional characteristics (workplace, type of contract, and leadership role) and are the ones that are most positively and significantly related to Well-being at work.N/

Dye-sensitized solar cells based on dimethylamino-π-bridge-pyranoanthocyanin dyes

UID/QUI/50006/2019 PTDC/QEQ-QFI/1971/2014 PD/BD/135087/2017 SFRH/BD/136556/2018 SFRH/BD/143309/2019 IF/00225/2015 DL57/2016 Program Contract (HC). UID/CTM/50025/2019 PTDC/CTM-ENE/5125/2014 CNPq 444061/2018-5 Universal grant 408181/2016-3The pyranoanthocyanins present in red wine display great potential as photosensitizers in bio-inspired Dye-Sensitized Solar Cells (DSSCs). Following a biomimetic approach, a series of amino-π-bridge-pyranoanthocyanin derivatives were employed as dye sensitizers in DSSCs. The dimethylamine group was selected to take advantage of its electron-donor character and the possibility of ‘dual-mode anchoring’ ([sbnd]OH vs. dimethylamino) to titanium dioxide. The increase in π-conjugation via insertion of C[dbnd]C bonds affected molecule flexibility, electron-donor ability and the pH-dependent equilibria of the pyranoanthocyanin derivatives. The current vs. potential properties of photoanodes using these dyes pointed to essential features of the relationship between power conversion efficiency and dye structure. These included the influences of the dimethylamine group, of π-conjugation and of substitution in ring B on the adsorption of the dyes to TiO2 and on the overall performance of the DSSCs prepared from them with and without added acid. An overall efficiency of 2.55% was obtained for the best performing compound, 4-(dimethylamino)-cinnamyl-pyranocyanidin-3-O-glucoside (JO3), which consolidates the importance of this family of compounds as potential dye-sensitizers for DSSC applications.authorsversionpublishe

FORESAM—FOG paradigm-based resource allocation mechanism for vehicular clouds

The Intelligent Transport Systems (ITS) has the objective quality of transportation improvement through transportation system monitoring and management and makes the trip more comfortable and safer for drivers and passengers. The mobile clouds can assist the ITS in handling the resource management problem. However, resource allocation management in an ITS is challenging due to vehicular network characteristics, such as high mobility and dynamic topology. With that in mind, we propose the FORESAM, a mechanism for resources management and allocation based on a set of FOGs which control vehicular cloud resources in the urban environment. The mechanism is based on a more accurate mathematical model (Multiple Attribute Decision), which aims to assist the allocation decision of resources set that meets the period requested service. The simulation results have shown that the proposed solution allows a higher number of services, reducing the number of locks of services with its accuracy. Furthermore, its resource allocation is more balanced the provided a smaller amount of discarded services

Structural and spectroscopic investigation of the charge-ordered, short-range ordered, and disordered phases of the Co3O2BO3 ludwigite

Charge ordering is prone to occur in crystalline materials with mixed-valence ions. It is presumably accompanied by a structural phase transition, with possible exceptions in compounds that already present more than one inequivalent site for the mixed-valence ions in the charge-disordered phase. In this work, we investigate the representative case of the homometallic Co ludwigite Co2+2Co3+O2BO3 (Pbam space group) with four distinct Co crystallographic sites [M1–M4] surrounded by oxygen octahedra. The mixed-valent character of the Co ions up to at least T=873 K is verified through x-ray absorption near-edge structure (XANES) experiments. Single crystal x-ray diffraction (XRD) and neutron powder diffraction (NPD) confirm that the Co ions at the M4 site are much smaller than the others at low temperatures, consistent with a Co3+ oxidation state at M4 and Co2+ at the remaining sites. The size difference between the Co ions in the M4 and M2 sites is continuously reduced upon warming above ≈370 K, indicating a gradual charge redistribution within the M4−M2−M4 (424) ladder in the average structure. Minor structural anomalies with no space group modification are observed near 475 and 495 K, where sharp phase transitions were previously revealed by calorimetry and electrical resistivity data. An increasing structural disorder, beyond a conventional thermal effect, is noted above ≈370 K, manifested by an anomalous increment of XRD Debye-Waller factors and broadened vibrational modes observed by Raman scattering. The local Co-O distance distribution, revealed by Co K-edge extended x-ray absorption fine structure (EXAFS) data and analyzed with an evolutionary algorithm method, is similar to that inferred from the XRD crystal structure below ≈370 K. At higher temperatures, the local Co-O distance distribution remains similar to that found at low temperatures, at variance with the average crystal structure obtained with XRD. We conclude that the oxidation states Co2+ and Co3+ are instantaneously well defined in a local atomic level at all temperatures, however the thermal energy promotes local defects in the charge-ordered configuration of the 424 ladders upon warming. These defects coalesce into a phase-segregated state within a narrow temperature interval (475<T<495 K). Finally, a transition at ≈500 K revealed by differential scanning calorimetry (DSC) in the iron ludwigite Fe3O2BO3 is discussed

Acute Capsaicin Analog Supplementation Improves 400 M and 3000 M Running Time-Trial Performance

International Journal of Exercise Science 13(2): 755-765, 2020. Objectives: Performance in running-based sport depends on the ability to perform repetitive high intensity muscle contractions. Previous studies have shown that capsaicin analog (CAP) (i.e. Capsiate) supplementation may improve this performance. The purpose of this study was to investigate the acute effect of CAP supplementation on short (400 m) and middle distance (3000 m) running time-trial performance, maximum heart rate (HR), and rate of perceived exertion (RPE). Methods: Twelve physically active men completed four randomized, double-blind trials: CAP condition (12 mg) or a placebo condition. Forty-five minutes after supplementation, the participants performed a 400- or 3000-meter running time trial. Time (in seconds) was recorded. HR was analyzed at rest and immediately post-exercise, and RPE was collected immediately after exercise. Results: For both the 400 m time-trial (CAP = 66.4 + 4.2 sec vs Placebo = 67.1 + 4.8 sec, p = 0.046) and the 3000 m time-trial (CAP = 893.9 ± 46.8 sec vs Placebo = 915.2 ± 67.6 sec, p = 0.015), the time in seconds was significantly less in the CAP compared to placebo conditions. There were no statistically significant differences for HR and RPE in any condition. Conclusion: In summary, acute CAP supplementation improved 400 m and 3000 m running time-trial performance in a distance-dependent way but without modifying the HR and RPE

DNA aneuploidy as a topographic malignant transformation pattern in a pleomorphic adenoma of long-term evolution: a case report

<p>Abstract</p> <p>Introduction</p> <p>We present a case of long-term evolution of a submandibular pleomorphic adenoma. There is little information about topographic malignant transformation patterns of pleomorphic adenomas.</p> <p>Case presentation</p> <p>We extensively analyze a giant submandibular mixed tumor of 25-year evolution in a 57-year-old Caucasian woman. Deoxyribonucleic acid ploidy was evaluated in different superficial and deep areas using flow cytometry analysis and correlated with pathological and immunohistochemical characteristics. Superficial areas exhibited a typical histological pleomorphic adenoma pattern and were deoxyribonucleic acid diploid. Deep samples showed deoxyribonucleic acid aneuploidy, atypical histological benign features and expression of markers involved at an early-stage of malignant transformation, such as tumor protein 53 and antigen Ki67.</p> <p>Conclusion</p> <p>These findings revealed that deep tumor compartments may be involved in the initial stages of malignant transformation. Deoxyribonucleic acid ploidy analysis may provide an additional diagnosis tool and indicate 'uncertain' areas that require careful study to avoid diagnostic errors. Larger studies are needed to confirm our results and to evaluate the usefulness of the technique.</p

Management and outcomes of patients with left atrial appendage thrombus prior to percutaneous closure

Altres ajuts: Fundación Interhospitalaria para la Investigación Cardiovascular (FIC Foundation); Abbott.Objective: Left atrial appendage (LAA) thrombus has heretofore been considered a contraindication to percutaneous LAA closure (LAAC). Data regarding its management are very limited. The aim of this study was to analyse the medical and invasive treatment of patients referred for LAAC in the presence of LAA thrombus. Methods: This multicentre observational registry included 126 consecutive patients referred for LAAC with LAA thrombus on preprocedural imaging. Treatment strategies included intensification of antithrombotic therapy (IAT) or direct LAAC. The primary and secondary endpoints were a composite of bleeding, stroke and death at 18 months, and procedural success, respectively. Results: IAT was the preferred strategy in 57.9% of patients, with total thrombus resolution observed in 60.3% and 75.3% after initial and subsequent IAT, respectively. Bleeding complications and stroke during IAT occurred in 9.6% and 2.9%, respectively, compared with 3.8% bleeding and no embolic events in the direct LAAC group before the procedure. Procedural success was 90.5% (96.2% vs 86.3% in direct LAAC and IAT group, respectively, p=0.072), without cases of in-hospital thromboembolic complications. The primary endpoint occurred in 29.3% and device-related thrombosis was found in 12.8%, without significant difference according to treatment strategy. Bleeding complications at 18 months occurred in 22.5% vs 10.5% in the IAT and direct LAAC group, respectively (p=0.102). Conclusion: In the presence of LAA thrombus, IAT was the initial management strategy in half of our cohort, with initial thrombus resolution in 60% of these, but with a relatively high bleeding rate (∼10%). Direct LAAC was feasible, with high procedural success and absence of periprocedural embolic complications. However, a high rate of device-related thrombosis was detected during follow-up

description of the methodological approach

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