ABSTRACT
Although two-dimensional nanosheets like graphene could be ideal atomic coatings to prevent corrosion, it is still controversial whether they are actually effective due to the presence of parasitic effects such as galvanic corrosion. Here, we reported a reduced graphene oxide (RGO) coating strategy to protect sintered Cu metal powders from corrosion by addressing the common galvanic corrosion issue of graphene. A layer of silane molecules, namely, (3-aminopropyl)triethoxysilane (APTES), is deposited between the surface of Cu particles and the graphene oxide (GO), acting as a primer to enhance adhesion and as an insulating interlayer to prevent the direct contact of the Cu with conductive RGO, mitigating the galvanic corrosion. Due to this core-shell coating, the RGO uniformly distributes in the Cu matrix after sintering, avoiding aggregation of RGO, which takes place in conventional GO-Cu composites. The dual coating of GO and silane results in bulk samples with improved anticorrosion properties, as demonstrated by galvanostatic polarization tests using Tafel analysis. Our development not only provides an efficient synthesis method to controllably coat GO on the surface of Cu but also suggests an alternative strategy to avoid the galvanic corrosion effect of graphene to improve the anticorrosion performance of metal.
ABSTRACT
Laparoscopic and open thoracic surgery in the neonate typically results in hypercapnea and low cardiac output with often poor surgical visualization as the anesthesiologist attempts to correct the respiratory derangements usually seen. We describe three cases in which jet ventilation provided not only superior ventilation with a return to normocapnea but also ideal operating conditions. In addition, jet ventilation utilizes lower mean airway pressures which typically results in improved cardiac output.
Subject(s)
High-Frequency Jet Ventilation , Thoracoscopy , Tracheoesophageal Fistula/surgery , Female , Humans , Infant, Newborn , Treatment OutcomeABSTRACT
INTRODUCTION: In Brazil, the largest diversity of phlebotomines is found in the Amazon region, particularly in undisturbed terra-firma forest. However, the phlebotomine fauna in other ecosystems of this region is still not well known. METHODS: In order to investigate the phlebotomine fauna of another Amazon ecosystem, collections were made using CDC light traps in the campina/campinarana ecosystems in the periurban zone of the city of Manaus. RESULTS: Eight hundred and fourteen phlebotomines of 26 species were captured, of which the most abundant were: Lutzomyia flaviscutellata (64.5%); Lutzomyia georgii (14%); Lutzomyia olmeca nociva (8.1%); Lutzomyia furcata (3.2%); Lutzomyia monstruosa (1.3%); Lutzomyia umbratilis (1.1%); and others (7.8%). CONCLUSIONS: The campina/campinarana ecosystems showed great epidemiological importance because of the high abundance of Lutzomyia flaviscutellata and Lutzomyia olmeca nociva, which are both vectors of Leishmania (Leishmania) amazonensis. Based on this information, it will be possible to outline goals for parasitological studies and raise awareness among researchers and students who are constantly exposed in these areas while conducting research work, regarding the possible risk of contamination by Leishmania.
Subject(s)
Ecosystem , Insect Vectors/classification , Psychodidae/classification , Animals , Brazil , Female , Leishmaniasis/transmission , Male , Population Density , Population DynamicsABSTRACT
INTRODUÇÃO: No Brasil, a maior diversidade de flebotomíneos é encontrada na Região Amazônica, principalmente em floresta primária de terra-firme. No entanto, sua fauna ainda é pouco conhecida em outros ecossistemas desta região. MÉTODOS: a fim de conhecer a fauna de flebotomíneos de outro ecossistema amazônico, coletas com armadilhas de luz CDC foram realizadas em uma área de campina/campinarana na zona periurbana da Cidade de Manaus. RESULTADOS: foram capturados 814 flebotomíneos de 26 espécies, sendo as mais abundantes: Lutzomyia flaviscutellata (64,5 por cento); Lutzomyia georgii (14 por cento); Lutzomyia olmeca nociva (8,1 por cento); Lutzomyia furcata (3,2 por cento); Lutzomyia monstruosa (1,3 por cento); Lutzomyia umbratilis (1,1 por cento) outros (7,8 por cento). CONCLUSÕES: Campina/campinarana revelou-se de grande importância epidemiológica devido a elevada abundância de Lutzomyia flaviscutellata e Lutzomyia olmeca nociva, ambas vetoras de Leishmania (Leishmania) amazonensis. Com base nestas informações, será possível traçar metas para estudos parasitológicos e conscientizar pesquisadores e estudantes, que mantém constante exposição nesta área realizando trabalhos de pesquisa, sobre o possível risco de contaminação por Leishmania.
INTRODUCTION: In Brazil, the largest diversity of phlebotomines is found in the Amazon region, particularly in undisturbed terra-firma forest. However, the phlebotomine fauna in other ecosystems of this region is still not well known. METHODS: In order to investigate the phlebotomine fauna of another Amazon ecosystem, collections were made using CDC light traps in the campina/campinarana ecosystems in the periurban zone of the city of Manaus. RESULTS: Eight hundred and fourteen phlebotomines of 26 species were captured, of which the most abundant were: Lutzomyia flaviscutellata (64.5 percent); Lutzomyia georgii (14 percent); Lutzomyia olmeca nociva (8.1 percent); Lutzomyia furcata (3.2 percent); Lutzomyia monstruosa (1.3 percent); Lutzomyia umbratilis (1.1 percent); and others (7.8 percent). CONCLUSIONS: The campina/campinarana ecosystems showed great epidemiological importance because of the high abundance of Lutzomyia flaviscutellata and Lutzomyia olmeca nociva, which are both vectors of Leishmania (Leishmania) amazonensis. Based on this information, it will be possible to outline goals for parasitological studies and raise awareness among researchers and students who are constantly exposed in these areas while conducting research work, regarding the possible risk of contamination by Leishmania.
Subject(s)
Animals , Female , Male , Ecosystem , Insect Vectors/classification , Psychodidae/classification , Brazil , Leishmaniasis/transmission , Population Density , Population DynamicsABSTRACT
Sessenta e quatro coelhos (45 machos e 19 fêmeas) foram utilizados, injetados com Nelprene látex 601 A Du Pont e Wanda-lar, através da aorta, e quando necessário, segmentos da a. umbilical processados através de cortes histológicos (7 u-HE) para comprovaçäo de obliteraçäo ou perviedade. As aa. umbilicais mostraram-se pérvias: em 100,00 % os coelhos com menos de 24 horas de vida pós-natal; em 100,00% de 24 a 36 horas; em 76,47% de 36 a 48 horas; em 100,00% com 2 dias; em 71,42% com 3 dias; e em 70,00% com 4 dias pós-parto. Acima de 4 dias pós-parto, é frequente a presença do verdadeiro ligamento umbilical, isto é, umbilicais impérvias
