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Zircon U-Pb and Lu-Hf isotope constraints on Archean crustal evolution in Southeastern Guyana Shield

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Geoscience Frontiers 2019年第4期10卷 1477-1506页

作者： joao Marinho Milhomem neto Jean-Michel Lafon Programa de Pos-graduacao em Geologia e Geoquimica-PPGG Instituto de Geociencias-IGUniversidade Federal do Para-UFPA66075-110BelemParaBrazil Laboratório de Geologia Isotópica-Pará-Iso IG-UFPA66075-110BelémParáBrazil

The southeastern Guyana Shield,northeast Amazonian Craton,in the north of Brazil,is part of a widespread orogenic belt developed during the Transamazonian orogenic cycle(2.26-1.95 Ga)that includes a large Archean continental landmass strongly reworked during the Transamazonian orogeny,named Amapa *** consists mainly of a high-grade metamorphic granulitic-migmatitic-gneiss complex,of Meso-to Neoarchean age and Rhyacian granitoids and supracrustal *** the first time,coupled U-Pb and Lu-Hf isotope data were obtained on zircon by LA-ICP-MS from five tectono-stratigraphic units of the Archean basement and one Paleoproterozoic intrusive rock,in order to investigate the main episodes of crustal growth and ***-rock Sm-Nd isotope data were compared to the zircon Lu-Hf *** main magmatic episodes were defined by U-Pb zircon dating,two in the Mesoarchean(~3.19 Ga and 2.85 Ga)and one in the Neoarchean(~2.69-2.65 Ga).SubchondriticεHf(t)values obtained for almost all investigated units indicate that crustal reworking processes were predominant during the formation of rocks that today make up the Amapa ***-TDMC model ages,ranging from2.99 Ga to 3.97 Ga,indicate that at least two important periods of mantle extraction and continental crust formation occurred during the Archean in southeastern Guyana Shield,an older one in the Eoarchean(~4.0 Ga)and a younger one in the Mesoarchean(~3.0-3.1 Ga).The latter is recognized as an important period of crustal accretion *** recognition of an Eoarchean episode to the southeastern most part of the Guyana Shield is unprecedented and was not recorded by whole-rock Sm-Nd data,which were restricted to the Meso-Paleoarchean(2.83 Ga to 3.51 Ga).This finding reveals t hat continental crust generation in the Amazonian Craton began at least 500 Ma earlier than previously suggested by the SmNd systematics.

关键词： U-Pb-Lu-Hf isotopes Zircon Archean crustal evolution Southeastern Guyana Shield Amazonian Craton

Continuous positive airway pressure acutely increases exercise duration in children with severe therapy-resistant asthma:a randomized crossover trial

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World Journal of Pediatrics 2021年第2期17卷 189-196页

作者： Claudia Silva Schindel Daniele Schiwe joao Paulo Heinzmann-Filho Natalia evangelista Campos Paulo Marcio Pitrez Marcio Vinicius Fagundes Donadio Laboratory of Pediatric Physical Activity Centro Infant.Pontiffcia Universidade Catolica do Rio Grande do Sul(PUCRS)Av.Ipiranga6690.2°andarPorto AlegreRS CEP 90610-000.Brazil Hospital Moinhos de Vento Porto AlegreBrazil and Centro InfantPontiffcia Universidade Catolica do Rio Grande do Sul(PUCRS)Porto Alegre.Brazil

Background Lower exercise tolerance is an important component of asthma and the possible effects of non-invasive ven-tilation on exercise capacity in individuals with severe therapy-resistant asthma(STRA)are *** study aimed to evaluate the immediate effect of continuous positive airway pressure(CPAP)on exercise tolerance in children with *** We performed a controlled,randomized,crossover clinical trial including subjects aged 6 to 18 years old diagnosed with ***,anthropometric and lung function data were *** participants in the intervention group(IG)used CPAP(PEEP 10cmH2O and FiO20.21)for a period of 40 *** in the control group(CG)used CPAP with mini-mum PEEP at 1 cmH20 also for 40 ***,subjects from both groups underwent cardiopulmonary exercise testing(CPET).After a 15-day washout period,on a subsequent visit,subjects participated in the opposite group to the initial *** Thirteen subjects with a mean age of 12.30±1.7 years were *** variables of peak expiratory flow(PEF)and forced expiratory volume in the first second(FEV1)before using CPAP and after performing CPET did not show sig-nificant *** CPET results,there was no significant difference(P=0.59)between groups at peak exercise for oxygen consumption—VO2(CG:33.4±6.3 and IG:34.5±5.9,mL kg^(-1)min^(-1)).However,the IG(12.4±2.1)presented a total test time(min)significantly(P=0.01)longer than the CG(11.5±1.3).Conclusion The results suggest that the use of CPAP before physical exercise increases exercise duration in children and adolescents with STRA.

关键词： Asthma Non-invasive ventilation Oxygen consumption Exercise test Exercise tolerance Exercise-induced bronchospasm

Quality of life,depression and anxiety in potential living liver donors for pediatric recipients:A retrospective single center experience

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World Journal of Hepatology 2022年第10期14卷 1899-1906页

作者： Paula K Reine Flavia Feier Eduardo Antunes da Fonseca Rosely G Hernandes joao Seda-neto Department of Psychology Hospital Sirio-LibanesSao Paulo 01308901Brazil Department ofLiver Transplantation Santa Casa de Porto AlegrePorto Alegre 90020090Brazil Department of Liver Transplantation Hospital Sirio-LibanesSao Paulo 01308901Brazil

BACKGROUND Living donor liver transplantation is a safe alternative for patients on a liver transplant *** evaluation goes beyond physical variables to include social,emotional,and ethical *** role of pre-donation sociopsychological evaluation of the donor candidate is as important to the success of the procedure as is the medical *** implies recovery from the operation and pro-mpt engagement in pre-transplant professional and social activities,without leading to psychological or physical *** profiling of potential living liver donors(PLLD)and evaluation of quality of life(QOL)can influence *** To evaluate the socio-demographics and psychological aspects(QOL,depression,and anxiety)of PLLD for pediatric liver transplantation in a cohort of 250 *** This was a retrospective cohort study of 250 PLLD who underwent psychological pre-donation evaluation between 2015 and *** the recipients were *** Beck anxiety inventory,Beck depression inventory,and 36-item short-form health survey(SF-36)scores were used to evaluate anxiety(Beck anxiety inventory),depression(Beck depression inventory),and QOL,*** A total of 250 PLLD were *** of them were women(54.4%),and the mean age was 29.2±7.2 years.A total of 120(48.8%)PLLD were employed at the time of evaluation for donation;however,most had low income(57%earned<2 times the minimum wage).A total of 110 patients(44%)did not finish the donation process,and 247 PLLD answered a questionnaire to evaluate depression,anxiety,and QOL(SF-36).Prevalence of depression was of 5.2%and anxiety 3.6%.Although most of the PLLD were optimistic regarding the donation process and never had doubts about becoming a donor,some traces of ambivalence were observed:46%of the respondents said they would feel relieved if a deceased donor became *** PLLD had a low prevalence of anxiety and *** foundation for effective and sa

关键词： Liver transplantation Children Outcomes Living donation

Ecophysiology and multivariate analysis for production of Tachigali vulgaris in Brazil:Influence of rainfall seasonality and fertilization

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Journal of Forestry Research 2023年第5期34卷 1289-1305页

作者： Pedro Henrique Oliveira Simoes Candido Ferreira de Oliveira neto Manoel Tavares de Paula Dênmora Gomes de Araújo Rodrigo Silva do Vale joao Olegário Pereira de Carvalho Universidade Federal de Mato Grosso Campus Universitario de SinopSinop 78550728Mato GrossoBrazil Universidade Federal Rural da Amazonia Campus BelemBelem 66077830ParaBrazil Universidade do Estado do Para Centro de Ciencias Naturais e TecnologiaBelem 66095015ParaBrazil Universidade Federal Rural da Amazonia Campus Capitao-PocoCapitao Poco 68650000ParaBrazil

Studies on fertilization management of species native to the Amazon for energy plantations contribute to the diversity of species use and reduce biological risk due to the excessive use of clones or hybrids of *** study evaluates the effect of precipitation seasonality and phosphorus and potassium fertilization on gas exchange in a Tachigali vulgaris *** levels of P(zero,65.2,130.4 kg ha^(-1))and three of K(zero,100.0,200.0 kg ha^(-1))were applied in a 3×3 factorial randomized block *** exchange measurements were conducted in April and November *** low rainfall,high irradiance period,photo synthetic rates were up to four times higher than in the high rainfall period,reaching 20.3μmol m^(-2)s^(-1)in the treatment with 130.4 g kg^(-1)of P and 100.0 g kg^(-1)of *** analysis and principal component analysis reduced the initial eight gas exchange variables to two and three principal components in periods of high and low rainfall,*** multivariate method used in this study readily identified variations in the variables as a function of rainfall,with high reliability in explaining the data set.

关键词： Photosynthesis rate Stomatal conductance Principal component analysis Factor analysis Tachigali vulgaris

Biliary complications after pediatric liver transplantation: Risk factors, diagnosis and management

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World Journal of Hepatology 2015年第18期7卷 2162-2170页

作者： Flavia H Feier Eduardo A da Fonseca joao Seda-neto Paulo Chapchap Hepatology and Liver Transplantation Hospital Sirio Libanes

The expanded indications of partial grafts in pediatric liver transplantation have reduced waiting list mortality. However, a higher morbidity is observed, including an increased rate of biliary complications(BCs). Factors such as the type of graft, the preservation methods applied, the donor characteristics, the type of biliary reconstruction, and the number of bile ducts in the liver graft influences the occurrence of these complications. Bile leaks and strictures comprise the majority of posttransplant BCs. Biliary strictures require a high grade of suspicion, and because most children have a bileoenteric anastomosis, its diagnosis and management rely on percutaneous hepatic cholangiography and percutaneous biliary interventions(PBI). The success rates with PBI range from 70% to 90%. Surgery is reserved for patients who have failed PBI. BCs in children after liver transplantation have a prolonged treatment and are associated with a longer length of stay and higher hospital costs. However, with early diagnosis and aggressive treatment, patient and graft survival are not significantly compromised.

关键词： Outcomes Live-donor Infants Strictures Bile leaks

Physiological plasticity in eucalyptus clones in the vegetative stage contributes to drought tolerance

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Journal of Forestry Research 2023年第5期34卷 1549-1561页

作者： Vilma Marques Ferreira Jailma Ribeiro de Andrade Claudiana Moura dos Santos Sebastiao de Oliveira Maia Júnior joao Correia de Araújo neto Andrea Francisca da Silva Santos Vicente Mota da Silva Lucas Teles Bezerra Laurício Endres Laboratório de Fisiologia Vegetal Campus de Engenharia e Ciências AgráriasUniversidade Federal de AlagoasRio LargoAL57072-900Brazil Laboratório de Ciências Ambientais e Biodiversidade Departamento de Zootecnia.Centro de Ciências AgráriasUniversidade Estadual do MaranhãoSão LuísMA65300-000Brazil Laboratório de Propagação de Plantas.Campus de Engenharia e Ciências Agrárias Universidade Federal de AlagoasRio LargoAL57072-900Brazil Laboratório de Lepidoptera Museu de ZoologiaUniversidade de São PauloIpirangaSão PauloSP04263-000Brazil

With the expansion of eucalyptus crops to areas with severe water limitations,physiological studies involving eucalyptus clones to identify those that are tolerant to water stress become *** objective of this study was to assess morphological and physiological responses by eucalyptus clones subjected to drought stress and *** experiment consisted of three eucalyptus clones:VC865,I224 and I144 and two water regimes:control and water stress followed by rehydration,with six *** water potential,gas exchange,maximum quantum efficiency of photo systemⅡand plant height and stem diameter were evaluated under drought stress and ***6 d of rehydration,the number of leaves,leaf area and dry mass of root,leaf,stem and their total were *** clones showed intense reduction of gas exchange during the drought stress period,and only VC865 and 1144 showed rapid recovery with 3 d of *** 1224 showed greater reduction in height,stem diameter,number of leaves,water potential at midday(Ψ_(w)_(Midday)),and maximum quantum efficiency of photosystemⅡ(F_(v)/F_(m)).Clones VC865and T144 showed lower reductions inΨ_(wMidday)and F_(v)/F_(m) under ***865 had lower reductions in leaf number,leaf area and higher leaf dry mass,while clone I144 had higher height and lower reduction in root dry mass *** these clones showed higher water use efficiency with 3d of *** different phenotypic plasticities gave the clones VC865 and 1144 efficient mechanisms of acclimatization to stress and more drought tolerance,enhancing their greater capacity for recovery after stress,which allowed lower dry mass *** 1224,however,was more susceptible to drought stress,undergoing greater physiological damage with only partial recovery during rehydration.

关键词： Drought Eucalyptus species Gas exchanges Post-stress Root dry mass

Nonextensivity and Tsallis Entropy in DNA Fragmentation Patterns by Ionizing Radiation

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Journal of Modern Physics 2012年第6期3卷 431-437页

作者： Carlos Antonio Marante Valdes Fidel Antonio Castro Smirnov Oscar Rodriguez Hoyos joao Dias de Toledo Arruda-neto Centro de Estudios Avanzados de Cuba(CEAC) HavanaCuba Universidad de las Ciencias Informaticas(UCI) HavanaCuba Instituto Superior de Tecnologias y Ciencias Aplicadas(InSTEC) HavanaCuba Physics Institute University of Sao PauloSao PauloBrasil CEPESq/Uniitalo—Italy-Brazilian University Center Sao PauloBrazil

Nonextensive statistical mechanics as in Tsallis formalism was used in this study, along with the dynamical Hamiltonian rod-like DNA model and the maximum entropy criteria for Tsallis’ entropy, so as to obtain length distribution of plasmid fragments, after irradiation with very high doses, assuming that the system reaches metaequilibrium. By intensively working out the Grand Canonical Ensemble (used to take into account the variation of the number of base pairs) a simplified expression for Fragment Size Distribution Function (FSDF) was obtained. This expression is dependent on two parameters only, the Tsallis q value and the minimal length of the fragments. Results obtained from fittings to available experimental data were adequate and the characteristic behavior of the shortest fragments was clearly documented and reproduced by the model, a circumstance never verified from theoretical distributions. The results point to the existence of an entropy which characterizes fragmentation processes and depending only on the q entropic index.

关键词： Nonextensive Statistics Tsallis Entropy DNA Fragment Distribution Theoretical Distribution Fragment Minimum Length DNA Data Analysis

On the Study of Autonomous Underwater Vehicles by Computational Fluid-Dynamics

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Open Journal of Fluid Dynamics 2020年第1期10卷 63-81页

作者： joao Victor Nunes de Sousa Antonio Gilson Barbosa de Lima Francisco Alves Batista Edna Cordeiro de Souza Daniel Cesar de Macedo Cavalcante Paulo de Morais Pessoa joao evangelista Franco do Carmo Department of Mechanical Engineering Federal University of Campina GrandeCampina GrandeBrazil Department of Physics State University of ParaibaCampina GrandeBrazil Department of Physics and Mathematical Federal University of Campina GrandeCampina GrandeBrazil Federal Institute of Education Science and Technology of the Sertao PernambucanoSerra TalhadaBrazil

Autonomous Underwater Vehicles (AUV’s) are considered as advanced classes of vehicles, capable of performing pre-established missions without physical communication with the ground or human assistance. The research and development of this type of vehicles have been motivated, due to its excellent characteristics, ideal to the military, scientific and industrial sectors. Thus, the objective of this paper is to study fluid flow behavior past over AUV’s, without and with control surfaces (rudders), by Computational Fluid-Dynamics (CFD), aiming to obtain information about the impact of the operating depth and control surfaces on the vehicle's hydrodynamics, in order to help researchers and designers of this class of vehicles. Results of the drag coefficient, pressure, velocity and streamlines distribution around the vehicles are presented and analyzed.

关键词： Autonomous Underwater Vehicle Fluid Flow Computational Fluid-Dynamics Drag Coefficient

Physicians and Conflicts of Interest

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International Journal of Clinical Medicine 2014年第16期5卷 956-965页

作者： Deborah Pimentel Maria-Jesia Vieira joao Pedro Declerc FSNeves Manoel Juvenal da Costa-neto Lais Costa Souza Oliveira Department of Medicine Universidade Federal de SergipeAracajuBrazil Universidade Tiradentes AracajuBrazil Postgraduate Program in Health Sciences Universidade Federal de SergipeAracajuBrazil Universidade Federal de Sergipe AracajuBrazil

In medical practice, the most commonly observed conflicts of interest are the ones existing in the relations between professionals and industries linked to health or between the former and health services. These relations are no longer a partnership in search of the best to be offered to patients and tend to take up a commercial role, in a seduction game where, each one, in their own manner, seeks benefits. The purpose of this study is to analyze the existence of these conflicts of interest, in an exploratory and qualitative study, with physician focal groups. The results were grouped in two categories: benefits received by physicians and the justifications provided by them for the establishment of these partnerships. The most common benefits are: percentages over orthoses and prosthetics received by the industry;discounts and credits on rent or condominium fees for exam indications and procedures;rewards offered by the pharmaceutical industry for the indication of their products. Physicians have pointed out as main determinants for ethical missteps that involve conflicts of interest, the character and family formation as well as the lack of denunciations. The fact that efficient and widespread laws for resolution of conflicts of interest do not exist makes it necessary to recognize their existence with mechanisms of management and transparency, perhaps as the only way to avoid negative interference in physician behavior.

关键词： Ethics Physicians Conflicts of Interest