MODELAGEM MOLECULAR DE COPOLÍMEROS ACEITADORES E DOADORES DE ELÉTRONS

With the discovery that some polymers could conduct electricity there was a strong demand for new systems that could reproduce or improve the properties of metallic materials, mainly for ease of synthesis, lower cost, and lightness. Currently, more than 85% of the world production of photovoltaic cells involves the use of crystalline silicon. The introduction of new organic materials with donor and acceptor characteristics has been used to improve the gap properties of the materials. Copolymers formed from benzothiadiazole, fluorene and thiophene with promising photovoltaic properties were theoretically studied. The energetic, structural, electronic and optical properties were obtained with the semi-empirical AM1 method and the optical properties were obtained with the ZINDO semi-empirical method. It is observed from the theoretical study that the electronic and optical properties of the molecules improve when combined the donor and acceptor molecule of electrons.Con el descubrimiento de que algunos polímeros pueden conducir la electricidad se ha producido una fuerte demanda de nuevos sistemas que pudieran mejorar las propiedades de los materiales metálicos, principalmente em relación a facilidad de síntesis, menor costo y peso ligero. Actualmente, más del 85% de la producción mundial de células fotovoltaicas implica el uso de silicio cristalino. La introducción de nuevos materiales orgánicos con características de donadores y aceptadores se ha utilizado para mejorar la propiedades de banda prohibida de los materiales. Fueron estudiados através de simulaciones computacionales copolímeros formados de benzotiadiazol, tiofeno y fluoreno com propiedades prometedoras para aplicaciones fotovoltaicas. Las propiedades energéticas, estructurales, electrónicas y ópticas se obtuvieron con el método semiempírico AM1 y las propiedades ópticas se obtuvieron con el método semiempírico ZINDO. Se observa del estudio teórico computacional que las propiedades electrónicas y ópticas de las moléculas mejoran cuando se combinan con las moléculas donadoras y aceptadoras de electrones.Com a descoberta de que alguns polímeros poderiam conduzir eletricidade houve uma forte demanda por novos sistemas que pudessem reproduzir ou melhorar as propriedades de materiais metálicos, objetivando principalmente facilidade de síntese, menor custo, e leveza. Atualmente, mais de 85% da produção mundial de células fotovoltaicas envolve a utilização de silício cristalino. A introdução de novos materiais orgânicos com características doadoras e aceitadoras tem sido utilizada para melhorar as propriedades de gap dos materiais. Foram estudados teoricamente os copolímeros formados de benzotiadiazole, fluoreno e tiofeno com promissoras propriedades fotovoltaicas. As propriedades energéticas, estruturais, eletrônicas e ópticas foram obtidas com o método semi empírico AM1 e as propriedades ópticas foram obtidas com o método semi empírico ZINDO. Observa-se do estudo teórico que as propriedades eletrônicas e ópticas das moléculas melhoram quando combinados a molécula doadora e aceitadora de elétrons

Estrutura de estádios ontogenéticos em população nativa da palmeira Syagrus romanzoffiana (Cham.) Glassman (Arecaceae) Structure of ontogenetic stages in a native population of the palm Syagrus romanzoffiana (Cham.) Glassman (Arecaceae)

O jerivá tem importância ecológica e econômica, inclusive palmito de qualidade. Para conhecer características básicas do ciclo de vida desta espécie, estudou-se a população na floresta paludícola da Reserva Santa Genebra (Campinas, SP). Observações e medições foram feitas em 100 parcelas (5×5 m) e sub-parcelas (2×2 m) aleatórias, dentro de uma área de 1 ha, realizadas novamente após 400 &plusmn; 3 dias. Foram reconhecidos seis estádios ontogenéticos, distinguíveis no campo: plântula (folha inteira estreita), juvenil fase 1 (folha inteira, largura > 2 cm), juvenil fase 2 (folha segmentada), imaturo (folha segmentada e estipe aéreo), virgem (estipe aéreo e raízes caulígenas) e reprodutor (raízes caulígenas e presença periódica de estruturas reprodutivas). Para o reconhecimento das plântulas usaram-se características foliares, pois o momento da independência trófica não pôde ser determinado no campo, tendo, o estádio, longa existência sob a baixa luminosidade do sub-bosque. Ocorreu sobreposição de tamanhos e na produção de folhas, embora houvesse diferenças significativas, pelo menos entre alguns estádios. As estruturas e propriedades adquiridas ou perdidas em cada estádio representariam vantagens adaptativas sob circunstâncias diferentes durante a ontogenia do jerivá, como a germinação remota, que pode ajudar a explicar a ampla ocorrência da espécie, incluindo áreas mais secas, e raízes caulígenas, por melhorar a fixação e nutrição previamente à reprodução, na floresta paludícola.<br>Syagrus romanzoffiana is ecologically and economically important, including the production of good-quality hearts of palm. Aiming to describe this plant's basic life cycle, we studied a natural population in the swamp forest at the Santa Genebra Reserve, Campinas municipality, São Paulo state. Observations and measurements were made, and repeated after 400 &plusmn; 3 days, in 100 randomly located plots (5×5 m) and sub-plots (2×2 m), in an area of 1 ha. Six ontogenetic stages were recognized: seedling (narrow entire leaf), juvenile phase 1 (entire leaf, width > 2 cm), juvenile phase 2 (segmented leaf), immature (segmented leaf, aerial stem), virgin (aerial stem, cauligenous roots), and reproductive (cauligenous roots and periodic presence of reproductive structures). Since the moment of trophic independence could not be determined in the field, leaf characteristics were used to identify seedlings. Seedlings live for a long time in the low light of the understory. Even though significant differences could be observed, size and leaf production overlapped among different stages. Remote germination, used to explain the widespread occurrence of the species even in dry regions, and cauligenous roots that improve fixation and nutrition previous to reproduction in swamp forests, are morphological structures and properties acquired or lost in each stage that may represent adaptive advantages under different circumstances during ontogeny of S. romanzoffiana

Update on the Cardiopulmonary Resuscitation and Emergency Cardiovascular Care Guideline of the Brazilian Society of Cardiology-2019

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Seminário de Dissertação (2024)

Página da disciplina de Seminário de Dissertação (MPPP, UFPE, 2022) Lista de participantes == https://docs.google.com/spreadsheets/d/1mrULe1y04yPxHUBaF50jhaM1OY8QYJ3zva4N4yvm198/edit#gid=

Effect of lung recruitment and titrated Positive End-Expiratory Pressure (PEEP) vs low PEEP on mortality in patients with acute respiratory distress syndrome - A randomized clinical trial

IMPORTANCE: The effects of recruitment maneuvers and positive end-expiratory pressure (PEEP) titration on clinical outcomes in patients with acute respiratory distress syndrome (ARDS) remain uncertain. OBJECTIVE: To determine if lung recruitment associated with PEEP titration according to the best respiratory-system compliance decreases 28-day mortality of patients with moderate to severe ARDS compared with a conventional low-PEEP strategy. DESIGN, SETTING, AND PARTICIPANTS: Multicenter, randomized trial conducted at 120 intensive care units (ICUs) from 9 countries from November 17, 2011, through April 25, 2017, enrolling adults with moderate to severe ARDS. INTERVENTIONS: An experimental strategy with a lung recruitment maneuver and PEEP titration according to the best respiratory-system compliance (n = 501; experimental group) or a control strategy of low PEEP (n = 509). All patients received volume-assist control mode until weaning. MAIN OUTCOMES AND MEASURES: The primary outcome was all-cause mortality until 28 days. Secondary outcomes were length of ICU and hospital stay; ventilator-free days through day 28; pneumothorax requiring drainage within 7 days; barotrauma within 7 days; and ICU, in-hospital, and 6-month mortality. RESULTS: A total of 1010 patients (37.5% female; mean [SD] age, 50.9 [17.4] years) were enrolled and followed up. At 28 days, 277 of 501 patients (55.3%) in the experimental group and 251 of 509 patients (49.3%) in the control group had died (hazard ratio [HR], 1.20; 95% CI, 1.01 to 1.42; P = .041). Compared with the control group, the experimental group strategy increased 6-month mortality (65.3% vs 59.9%; HR, 1.18; 95% CI, 1.01 to 1.38; P = .04), decreased the number of mean ventilator-free days (5.3 vs 6.4; difference, −1.1; 95% CI, −2.1 to −0.1; P = .03), increased the risk of pneumothorax requiring drainage (3.2% vs 1.2%; difference, 2.0%; 95% CI, 0.0% to 4.0%; P = .03), and the risk of barotrauma (5.6% vs 1.6%; difference, 4.0%; 95% CI, 1.5% to 6.5%; P = .001). There were no significant differences in the length of ICU stay, length of hospital stay, ICU mortality, and in-hospital mortality. CONCLUSIONS AND RELEVANCE: In patients with moderate to severe ARDS, a strategy with lung recruitment and titrated PEEP compared with low PEEP increased 28-day all-cause mortality. These findings do not support the routine use of lung recruitment maneuver and PEEP titration in these patients. TRIAL REGISTRATION: clinicaltrials.gov Identifier: NCT01374022

Neotropical freshwater fisheries : A dataset of occurrence and abundance of freshwater fishes in the Neotropics

The Neotropical region hosts 4225 freshwater fish species, ranking first among the world's most diverse regions for freshwater fishes. Our NEOTROPICAL FRESHWATER FISHES data set is the first to produce a large-scale Neotropical freshwater fish inventory, covering the entire Neotropical region from Mexico and the Caribbean in the north to the southern limits in Argentina, Paraguay, Chile, and Uruguay. We compiled 185,787 distribution records, with unique georeferenced coordinates, for the 4225 species, represented by occurrence and abundance data. The number of species for the most numerous orders are as follows: Characiformes (1289), Siluriformes (1384), Cichliformes (354), Cyprinodontiformes (245), and Gymnotiformes (135). The most recorded species was the characid Astyanax fasciatus (4696 records). We registered 116,802 distribution records for native species, compared to 1802 distribution records for nonnative species. The main aim of the NEOTROPICAL FRESHWATER FISHES data set was to make these occurrence and abundance data accessible for international researchers to develop ecological and macroecological studies, from local to regional scales, with focal fish species, families, or orders. We anticipate that the NEOTROPICAL FRESHWATER FISHES data set will be valuable for studies on a wide range of ecological processes, such as trophic cascades, fishery pressure, the effects of habitat loss and fragmentation, and the impacts of species invasion and climate change. There are no copyright restrictions on the data, and please cite this data paper when using the data in publications

NEOTROPICAL CARNIVORES: a data set on carnivore distribution in the Neotropics

Mammalian carnivores are considered a key group in maintaining ecological health and can indicate potential ecological integrity in landscapes where they occur. Carnivores also hold high conservation value and their habitat requirements can guide management and conservation plans. The order Carnivora has 84 species from 8 families in the Neotropical region: Canidae; Felidae; Mephitidae; Mustelidae; Otariidae; Phocidae; Procyonidae; and Ursidae. Herein, we include published and unpublished data on native terrestrial Neotropical carnivores (Canidae; Felidae; Mephitidae; Mustelidae; Procyonidae; and Ursidae). NEOTROPICAL CARNIVORES is a publicly available data set that includes 99,605 data entries from 35,511 unique georeferenced coordinates. Detection/non-detection and quantitative data were obtained from 1818 to 2018 by researchers, governmental agencies, non-governmental organizations, and private consultants. Data were collected using several methods including camera trapping, museum collections, roadkill, line transect, and opportunistic records. Literature (peer-reviewed and grey literature) from Portuguese, Spanish and English were incorporated in this compilation. Most of the data set consists of detection data entries (n = 79,343; 79.7%) but also includes non-detection data (n = 20,262; 20.3%). Of those, 43.3% also include count data (n = 43,151). The information available in NEOTROPICAL CARNIVORES will contribute to macroecological, ecological, and conservation questions in multiple spatio-temporal perspectives. As carnivores play key roles in trophic interactions, a better understanding of their distribution and habitat requirements are essential to establish conservation management plans and safeguard the future ecological health of Neotropical ecosystems. Our data paper, combined with other large-scale data sets, has great potential to clarify species distribution and related ecological processes within the Neotropics. There are no copyright restrictions and no restriction for using data from this data paper, as long as the data paper is cited as the source of the information used. We also request that users inform us of how they intend to use the data

Proceedings Of The 23Rd Paediatric Rheumatology European Society Congress: Part Two

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