DIFFUSION OF MAGNETIC FIELD AND REMOVAL OF MAGNETIC FLUX FROM CLOUDS VIA TURBULENT RECONNECTION

Santos-Lima, R.,Lazarian, A.,de Gouveia Dal Pino, E. M.,Cho, J. IOP Publishing 2010 The Astrophysical journal Vol.714 No.1

<P>The diffusion of astrophysical magnetic fields in conducting fluids in the presence of turbulence depends on whether magnetic fields can change their topology via reconnection in highly conducting media. Recent progress in understanding fast magnetic reconnection in the presence of turbulence reassures that the magnetic field behavior in computer simulations and turbulent astrophysical environments is similar, as far as magnetic reconnection is concerned. This makes it meaningful to perform MHD simulations of turbulent flows in order to understand the diffusion of magnetic field in astrophysical environments. Our studies of magnetic field diffusion in turbulent medium reveal interesting new phenomena. First of all, our three-dimensional MHD simulations initiated with anti-correlating magnetic field and gaseous density exhibit at later times a de-correlation of the magnetic field and density, which corresponds well to the observations of the interstellar media. While earlier studies stressed the role of either ambipolar diffusion or time-dependent turbulent fluctuations for de-correlating magnetic field and density, we get the effect of permanent de-correlation with one fluid code, i.e., without invoking ambipolar diffusion. In addition, in the presence of gravity and turbulence, our three-dimensional simulations show the decrease of the magnetic flux-to-mass ratio as the gaseous density at the center of the gravitational potential increases. We observe this effect both in the situations when we start with equilibrium distributions of gas and magnetic field and when we follow the evolution of collapsing dynamically unstable configurations. Thus, the process of turbulent magnetic field removal should be applicable both to quasi-static subcritical molecular clouds and cores and violently collapsing supercritical entities. The increase of the gravitational potential as well as the magnetization of the gas increases the segregation of the mass and magnetic flux in the saturated final state of the simulations, supporting the notion that the reconnection-enabled diffusivity relaxes the magnetic field + gas system in the gravitational field to its minimal energy state. This effect is expected to play an important role in star formation, from its initial stages of concentrating interstellar gas to the final stages of the accretion to the forming protostar. In addition, we benchmark our codes by studying the heat transfer in magnetized compressible fluids and confirm the high rates of turbulent advection of heat obtained in an earlier study.</P>

ASHINI, D’ YVES THÉRIAULT: DE LA DÉNONCIATION DE LA DYSTOPIE À L’ ANNONCE DES RÉPARATIONS

Oliveira Humberto Luiz Lima de 한국캐나다학회 2022 Asia-Pacific Journal of Canadian Studies (APJCS) Vol.28 No.1

Pourquoi lire un récit littéraire écrit par un Blanc, thématisant la situation des Peuples de Premières Nations dans l’espace québécois, lorsque plusieurs auteurs et autrices autochtones sont déjà reconnus sur la scène littéraire panaméricaine? Dans ce travail, nous aimerions mettre en évidence le caractère inaugural de ce récit littéraire intitulé Ashini, du Québécois Yves Thériault dont le personnage homonyme échappe tant aux stéréotypes négatifs qu’aux idéalisations que jusqu’alors enfermaient la figura de l’“Amérindien”. Et cela bien avant l’émergence de la littérature autochtone écrite (Boudreau: 1993). Dans ce roman Yves Thériault réussit, de façon magistrale, tant à faire la dénonciation de la dystopie (la déstructuration du monde autochtone) ainsi que l’annonce des réparations : le droit à la citoyenneté canadienne lequel passerait par la réappropriation des territoires ancestraux usurpés aux Premières Nations par les Blancs qui avaient copié le colonialisme (Morisset: 2004).

Clinical outcomes of combined anterior cruciate ligament and anterolateral ligament reconstruction: a systematic review and meta-analysis

( Diego Ariel De Lima ),( Lana Lacerda De Lima ),( Nayara Gomes Reis De Souza ),( Rodrigo Amorim De Moraes Perez ),( Marcel Faraco Sobrado ),( Tales Mollica Guimaraes ),( Camilo Partezani Helito ) 대한슬관절학회 2021 대한슬관절학회지 Vol.33 No.-

Objectives: To compare the clinical outcomes of isolated anterior cruciate ligament (ACL) reconstruction with combined reconstruction of the ACL and anterolateral ligament (ALL) of the knee. Methods: A search was conducted on the PubMed, Medline, Google Scholar, EMBASE, and Cochrane library databases, in line with the PRISMA protocol. The indexation terms used were “anterior cruciate ligament” OR “acl” AND “anterolateral ligament” AND “reconstruction.” Articles that compared patients submitted to combined ACL and ALL reconstruction with those submitted to isolated reconstruction of the ACL, with levels of evidence I, II, and III, were included. Studies with follow-up of less than 2 years and articles that did not use “anatomical” techniques for ALL reconstruction, such as extraarticular tenodesis, were excluded. A meta-analysis with R software was conducted, with a random effects model, presented as risk ratio (RR) or mean difference (MD), with a 95% confidence level (CI) and statistically significant at p < 0.05. Results: Ten articles were selected, with a total of 1495 patients, most of whom were men, of whom 674 submitted to ACL and ALL reconstruction and 821 to isolated ACL reconstruction. Combined ACL and ALL reconstruction exhibited a statistically significant advantage in residual pivot shift (RR 0.34, 95% CI 0.24-0.47, I² = 0%, p < 0.01), rerupture rate (RR 0.34, 95% CI 0.19-0.62, I² = 0%, p < 0.01), Lachman test (RR 0.59, 95% CI 0.40-0.86, I² = 21%, p < 0.01), and postoperative Lysholm score (MD 2.28, CI 95% 0.75-3.81, I² = 73%, p < 0.01). Conclusions: Combined ACL and ALL reconstruction obtained better postoperative clinical outcomes when compared with isolated ACL reconstruction, especially in reducing residual pivot shift and rerupture rate.

Factors Associated With the Illness of Nursing Professionals Caused by COVID-19 in Three University Hospitals in Brazil

de Oliveira, Larissa Bertacchini,de Souza, Luana Mendes,de Lima, Fabia Maria,Fhon, Jack Roberto Silva,Puschel, Vilanice Alves de Araujo,Carbogim, Fabio da Costa Occupational Safety and Health Research Institute 2022 Safety and health at work Vol.13 No.2

Background: The coronavirus disease 2019 (COVID-19) pandemic has demonstrated the importance of implementing strategic management that prioritizes the safety of frontline nurse professionals. In this sense, this research was aimed at identifying factors associated with the illness of nursing professionals caused by COVID-19 according to socio-demographic, clinical, and labor variables. Methods: A cross-sectional study was conducted in three Brazilian university hospitals with 859 nursing professionals, which include nurses, technicians, and nursing assistants, between November 2020 and February 2021. We present data using absolute and relative frequency. We used Chi-square test for hypothesis testing and multiple logistic regression for predictive analysis and chances of occurrence. Results: The rate of nursing professionals affected by COVID-19 was 41.8%, and the factors associated with contamination were the number of people in the same household with COVID-19 and obesity. Being a nurse was a protective factor when the entire nursing team was considered. The model is significant, and its variables represent 56.61% of the occurrence of COVID-19 in nursing professionals. Conclusion: Obesity and living in the same household as other people affected by COVID-19 increases the risk of contamination by this new coronavirus.

Solid Phase Extraction of Phospholipids from Brazil Nut (Bertholletia excelsa) and Their Characterization by Mass Spectrometry Analysis

Lima, Bruna R. De,Silva, Felipe M.A. Da,Koolen, Hector H.F.,Almeida, Richardson A. De,Souza, Afonso D.L. De Korean Society for Mass Spectrometry 2014 Mass spectrometry letters Vol.5 No.4

The Brazil nut (Bertholletia excelsa - Lecythidaceae) is considered a product with high economic value, being a food widely appreciated for its nutritional qualities. Although previous studies have reported the biochemical composition of Brazil nut oil, the knowledge regarding the phospholipid composition exhibits a disagreement: the composition of fatty acids present in the structures of phospholipids is reported as being different from the composition of the free fatty acids present in the oil. In this work, solid phase extraction (SPE) was employed to provide a fast extraction of the phospholipids from Brazil nuts, in order to compare the phospholipid profile of the in nature nuts and their fatty acids precursor present in the oil. The major phospholipids were characterized by mass spectrometry approach. Their fragmentation pattern through direct infusion electrospray ionization ion-trap tandem mass spectrometry ($ESI-IT-MS^2$) proved to be useful to unequivocal characterization of these substances. High resolution (HR) experiments through ESI using a quadruple time of flight mass spectrometry (QTOF) system were performed to reinforce the identifications.

Yacon-Based Product in the Modulation of Intestinal Constipation

Moˆnica de Souza Lima Sant’Anna,Vivian Carolina Rodrigues,Tatiane Ferreira Arau´jo,Taˆnia Toledo de Oliveira,Maria do Carmo Gouveia Peluzio,Ce´lia Lu´cia de Luces Fortes Ferreira 한국식품영양과학회 2015 Journal of medicinal food Vol.18 No.9

This study aimed to assess the effects of a yacon-based product (YBP) on constipation in adults, including the elderly. Forty-eight individuals were recruited and divided into equal intervention groups named the test and control groups. The YBP (test) and the control (maltodextrin) were dissolved in commercial orange juice. The volunteers for the YBP/test group consumed, on a daily basis, orange juice containing 10 g fructooligosaccharide (FOS)/inulin per day. The control group consumed, on a daily basis, orange juice containing 25 g of maltodextrin. The study had a span of 30 days. We evaluated the participants’ frequency of evacuation, consistency of the feces, constipation score, abdominal symptoms (flatulence, pain, and abdominal strain), and effects upon the microbiota, pH, lactate, and short-chain fatty acids (SCFAs) of the feces. The study showed an increased number of evacuations after the consumption of the YBP as well as an improvement in the consistency of the feces and a reduction in the constipation score. After 30 days of intervention, the group that consumed the YBP showed higher counts of Bifidobacterium, lower Clostridium and enterobacteria counts, and lower fecal pH. In relation to SCFAs, no significant change was found after the intervention. However, the lactate concentration was higher in the test group when compared to the post-treatment control group. The YBP was effective in improving constipation symptoms; not only was its functional characteristic in reducing constipation symptoms evident but it also demonstrated usefulness as a potential therapy.

90-Day Oral Toxicity Assessment of Tropaeolum majus L. in Rodents and Lagomorphs

Valdinei de Oliveira Araujo,Carlos Eduardo Linhares Andreotti,Michelle de Paula Reis,Daniely Alves de Lima,Karoline Bach Pauli,Bruna Caroline Nunes,Caroline Gomes,Ricardo de Melo Germano,Euclides Lara 한국식품영양과학회 2018 Journal of medicinal food Vol.21 No.8

Tropaeolum majus L., popularly known as nasturtium, is a species widely used in the form of infusions and salads. In the last years, the antihypertensive, diuretic, and calcium and potassium sparing activities of T. majus preparations were shown. Moreover, no preclinical 90-day oral toxicity studies were conducted. Thus, this study evaluated the toxicity of the hydroethanolic extract obtained from T. majus (HETM) leaves in female and male mice, rats, and rabbits. Swiss mice and Wistar rats were treated with HETM (75, 375, and 750 mg/kg). The doses of rabbits (30, 150, and 300 mg/kg) were calculated by allometric extrapolation. The control groups received vehicle. The animals were orally treated, daily, for 90 days. At the end, the animals were anesthetized, and body weight gain, relative weight of liver, kidney, and spleen, and histopathological changes were evaluated. Serum hematological and biochemical parameters were also analyzed. No alterations were found in body and organ weights or in histopathological and biochemical evaluation. Hematological analyses revealed small changes in lymphocytes and neutrophil counts in rats after administration of 750 mg/kg of HETM. These results showed that 90-day use of T. majus is safe in rodents and lagomorphs.

Solid Phase Extraction of Phospholipids from Brazil Nut (Bertholletia excelsa) and Their Characterization by Mass Spectrometry Analysis

( Bruna R. De Lima ),( Felipe M. A. Da Silva ),( Hector H. F. Koolen ),( Richardson A. De Almeida ),( Afonso D. L. De Souza ) 한국질량분석학회 2014 Mass spectrometry letters Vol.5 No.4

The Brazil nut (Bertholletia excelsa - Lecythidaceae) is considered a product with high economic value, being a food widely appreciated for its nutritional qualities. Although previous studies have reported the biochemical composition of Brazil nut oil, the knowledge regarding the phospholipid composition exhibits a disagreement: the composition of fatty acids present in the structures of phospholipids is reported as being different from the composition of the free fatty acids present in the oil. In this work, solid phase extraction (SPE) was employed to provide a fast extraction of the phospholipids from Brazil nuts, in order to compare the phospholipid profile of the in nature nuts and their fatty acids precursor present in the oil. The major phospholipids were characterized by mass spectrometry approach. Their fragmentation pattern through direct infusion electrospray ionization ion-trap tandem mass spectrometry (ESI-IT-MS2) proved to be useful to unequivocal characterization of these substances. High resolution (HR) experiments through ESI using a quadruple time of flight mass spectrometry (QTOF) system were performed to reinforce the identifications.

Developing Smart Grids Based on GPRS and ZigBee Technologies Using Queueing Modeling–Based Optimization Algorithm

Gustavo Batista de Castro Souza,Flávio Henrique Teles Vieira,Cláudio Ribeiro Lima,Getúlio Antero de Deus Júnior,Marcelo Stehling de Castro,Sérgio Granato de Araujo,Thiago Lara Vasques 한국전자통신연구원 2016 ETRI Journal Vol.38 No.1

Smart metering systems have become widespread around the world. RF mesh communication systems have contributed to the creation of smarter and more reliable power systems. This paper presents an algorithm for positioning GPRS concentrators to attain delay constraints for a ZigBee-based mesh network. The proposed algorithm determines the number and placement of concentrators using integer linear programming and a queueing model for the given mesh network. The solutions given by the proposed algorithm are validated by verifying the communication network performance through simulations.

MORPHOLOGICAL CHARACTERIZATION OF THE SURFACE OF NANOPOROUS ALUMINUM OXIDE BY AFM AND LAWS OF SCALE

L. C. DE LIMA,M. M. G. DE MACEDO,M. P. DE ALBUQUERQUE,MARCELO P. DE ALBUQUERQUE,R. A. SIM˜AO 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2009 NANO Vol.4 No.3

This article presents a morphological, chemical, and fractal dimension study of the time evolution of aluminum AC anodization in 1 M H3PO4 solution. The morphological analysis was accomplished by Atomic Force Microscopy (AFM) and Scanning Electron Microscopy (SEM). According to SEM, ordered porous pattern was already observed after 90 s of anodization, yet AFM revealed a different surface morphology evolution. Stripes were observed on the surface at the initial stages of anodization, developing to the formation of a complete phosphate layer at an intermediate stage and finally, to a porous structure at the steady stage. The phosphate layer was observed by AFM as well as by Auger Electron Spectroscopy (AES). Nevertheless, it could not be noticed by SEM. AFM data were quantified by fractal dimension and no significant changes in terms of fractal dimension were found in the function of the anodization time.