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1.
Spatiotemporal distribution of Schizaphis graminum (Rondani) and its natural enemy Coccinella septempunctata (Linnaeus) in graniferous sorghum crops
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Lopes, P. C.
; Souza, P. G. C.
; Santos, J. C. B.
; Borges, C. E.
; Araújo, F. H. V.
; Martins, J. C.
; Picanço, M. C.
; Soares, M. A.
; Veloso, R. V. S.
; Oliveira, J. R.
; Rossini, L. C.
; Siqueira, F. C.
; Silva, R. C. da
.
Resumo Em uma escala global o Sorghum bicolor (L.) é uma das culturas mais importantes, ocupando o quinto lugar entre todos os cereais. É cultivada na África, Ásia, Oceania e Américas, onde serve como fonte de alimento e ração para humanos e animais, respectivamente. No entanto, a produção é limitada por vários fatores, incluindo pragas e doenças. Entre as pragas que atacam o sorgo, Schizaphis graminum (Rondani), comumente chamado de pulgão verde dos cereais, é a praga mais destrutiva do sorgo. O dano de S. graminum ao sorgo é agravado pelo déficit hídrico que favorece sua ocorrência. Informações limitadas sobre a distribuição espacial da praga e seus inimigos naturais impedem o desenvolvimento de estratégias de manejo ecologicamente corretas. Portanto, o objetivo desta pesquisa foi determinar a distribuição espaço-temporal de S. graminum e seu inimigo natural Coccinella septempunctata (L.) durante a fase vegetativa e reprodutiva da cultura por meio de análise geoestatística. A distribuição espaço-temporal de S. graminum foi influenciada pelo estágio de desenvolvimento do sorgo, paisagem circundante e presença de seu principal predador C. septempunctata. Além disso, a abundância de C. septempunctata foi influenciada pela densidade de S. graminum. Os resultados deste estudo são necessários para o desenvolvimento de estratégias sustentáveis de manejo de pragas contra S. graminum.
Abstract At the global level, Sorghum bicolor (L.), is one of the most important crops, which ranks fifth among all cereals. It is cultivated in Africa, Asia, Oceania and the Americas, where it serves as a source of food and feed for humans and animals, respectively. However, production is constrained by several factors including pests and diseases. Among the pests that are known to attack Sorghum, Schizaphis graminum (Rondani), commonly called the green cereal aphid, is the most destructive pest of sorghum. S. graminum damage to sorghum is worsen by water deficit which favors its occurrence. Limited information on the spatial distribution of the pest and its natural enemies impedes the development of ecologically friendly management strategies. Therefore, the objective of this research was to determine the spatiotemporal distribution of S. graminum and its natural enemy Coccinella septempunctata (L.) during the vegetative and reproductive stage of the crop using geostatistical analysis. The spatiotemporal distribution of S. graminum was influenced by Sorghum development stage, surrounding landscape, and presence of its main predator C. septempunctata. Moreover, the abundance of C. septempunctata was influenced by the density of S. graminum. The findings from this study are required for developing sustainable pest management strategies against S. graminum.
2.
Multidisciplinary Scientific Cruises for Environmental Characterization in the Santos Basin – Methods and Sampling Design
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Moreira, Daniel L.
; Dalto, Adriana G.
; Figueiredo JR, Alberto G.
; Valerio, Aline M.
; Detoni, Amalia M. S.
; Bonecker, Ana C. T.
; Signori, Camila N.
; Namiki, Cláudia
; Sasaki, Dalton K.
; Pupo, Daniel V.
; Silva, Danilo A.
; Kutner, Deborah S.
; Duque-Castaño, Diana C.
; Marcon, Eduardo H.
; Gallotta, Fabiana D. C.
; Paula, Fabiana S.
; Gallucci, Fabiane
; Roque, Gabriela C. F.
; Campos, Giulia S.
; Fonseca, Gustavo
; Mattos, Gustavo
; Lavrado, Helena P.
; Silveira, Ilson C. A. da
; Costa, Jessica O.
; Santos Filho, João R. dos
; Carneiro, Juliane C.
; Moreira, Julio C.F.
; Rozo, Laura
; Araujo, Leandro F.M.
; Lazzari, Letícia
; Silva, Letícia O. da
; Michelazzo, Luan S.
; Fernandes, Luciano F.
; Dottori, Marcelo
; Araújo Jr., Marcus A. G. de
; Chuqui, Mateus G.
; Ceccopieri, Milena
; Borges-Silva, Milton
; Kampel, Milton
; Bergo, Natascha M.
; Silva, Paulo V. M.
; Tura, Pedro M.
; Moura, Rafael B. de
; Romano, Renato G.
; Martins, Renato P.
; Carreira, Renato S.
; Toledo, Rodrigo G.A.
; Bonecker, Sérgio L.C.
; Disaró, Sibelle T.
; Rodrigues, Silvana V.
; Corbisier, Thais N.
; Vicente, Thaisa M.
; Paiva, Vitor G. de
; Pellizari, Vivian H.
; Belo, Wellington C.
; Brandini, Frederico P.
; Sousa, Silvia H.M
.
Abstract The Santos Basin (SB) is the main petroliferous basin in the Brazilian continental margin and one of the most studied marine areas in Brazil. However, historical data suggest that new efforts should be carried out to acquire quantitative biological data, especially in the deep sea, to establish the baseline of essential ocean variables in different ecosystems for future monitoring programs. The Brazilian energy company Petrobras planned and executed 24 oceanographic cruises over a period of 2 years to assess the benthic (SANSED cruise) and pelagic (SANAGU cruise) systems of the SB (356 days at sea in 2019 and 2021/2022). These efforts were part of the Santos Project, which comprised a comprehensive environmental study aimed at investigating benthic and pelagic variables to characterize ecology, biogeochemistry, thermohaline properties of water masses, and ocean circulation patterns, geomorphology, and sedimentology, as well as organic and inorganic chemistry. Here we present the detailed sampling designs and the field methods employed on board, during the SB scientific cruises. All sampling protocols were based on standardized approaches. For the benthos analyses, triplicate sediment samples were performed using a GOMEX-type box corer (0.25 m²) or a large modified Van Veen grab (0.75 m²) at 100 stations ranging from 25 to 2400 m depth. At each station, 25 geochemical and physico-chemical parameters were analyzed in addition to micro-, meio-, and macrofauna and living foraminifera samples. For the pelagic system, 60 stations were selected to investigate the plankton community, ranging in size from pico- to macroplankton, through vertical, horizontal, and oblique net hauls (20, 200, and 500 μm mesh size), as well as 25 biogeochemical parameters collected with an aid of a CTD-rosette sampler. Part of this scientific information also serves the Regional Environmental Characterization Project (PCR-BS) in support of Petrobras’ Santos Basin drilling licensing process led by the Brazilian Environmental Agency – IBAMA. This project contributes to the sustainable development of the SB, in line with the guidelines of the United Nations Decade of Ocean Science for Sustainable Development.
3.
Small mammals in the diet of Barn Owls (Tyto furcata) in an urban area in Rio de Janeiro state, Brazil, with a new record of the dwarf mouse opossum (Cryptonanus)
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Almeida, A. J.
; Ribeiro, R. R.
; Maia-Júnior, J. A.
; Silva, V. C.
; Borges, I. C. V.
; Gonçalves, P. R.
; Rangel, K. S.
; Dias, H. V. R.
; Godinho, A. B. F. R.
.
Resumo Vários estudos enfatizam o uso de pelotas de coruja em inventários de pequenos mamíferos em áreas naturais com elevada riqueza de espécies raras, mas poucas localidades da Mata Atlântica brasileira têm sido inventariadas por esse método. O presente estudo documenta a composição de espécies e abundância de pequenos mamíferos na dieta de Tyto furcata em uma área urbana do município de Campos dos Goytacazes, Rio de Janeiro, Brasil, discutindo a relevância de um novo registro de um raro marsupial do gênero Cryptonanus na Mata Atlântica. Foram analisadas 265 pelotas regurgitadas por um casal de T. furcata entre novembro de 2016 e setembro de 2017, encontradas abaixo de uma caixa de nidificação. A análise das amostras permitiu encontrar o total de 596 indivíduos de quatro espécies pequenas de mamíferos. O roedor exótico Mus musculus foi predominante entre os itens alimentares (98,3%), enquanto os roedores nativos Necromys lasiurus (1,3%) e Holochilus brasiliensis (0,17%) foram bem mais raros. Um único espécime de Cryptonanus sp. foi identificado entre os itens com base em caracteres dentários. A identificação desse gênero no presente estudo representa o segundo registro no estado do Rio de Janeiro e o sexto no bioma Mata Atlântica, sugerindo que este marsupial ocupa uma ampla faixa ecológica e biogeográfica. O presente estudo destaca a relevância dos pellets de coruja para pesquisas com pequenos mamíferos, mesmo em áreas urbanas e altamente perturbadas.
Abstract Several studies emphasize the use of owl pellets in small mammal inventories in natural areas harboring high richness of rare species, but few Brazilian Atlantic forest localities have been surveyed by this method. The present study documents the species composition and abundance of small mammals in the diet of Tyto furcata in an urban area of the municipality of Campos dos Goytacazes, Rio de Janeiro, Brazil, remarking on a new record of the dwarf mouse opossum genus Cryptonanus in the Atlantic forest. We analyzed 265 pellets regurgitated by a pair of T. furcata from November 2016 to September 2017 found in a nesting box. Analysis of the samples enabled finding a total of 596 individuals of four small mammal species. Mus musculus was predominant among the prey items (98.3%), while the native rodents Necromys lasiurus (1.3%) and Holochilus brasiliensis (0,17%) were much rarer. A single specimen of Cryptonanus sp. was identified among the diet items based on distinctive dental characters. The identification of this genus in the present study represents the second record in the state of Rio de Janeiro, and the sixth in the Atlantic Forest biome, suggesting that this marsupial occupies a wider ecological and biogeographic range. The present study underscores the relevance of owl pellets for small mammal surveys, even in urban and highly disturbed areas.
https://doi.org/10.1590/1519-6984.237675
215 downloads
4.
COVID-19 in the Perioperative Period of Cardiovascular Surgery: the Brazilian Experience
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Gomes, Walter J.
; Rocco, Isadora
; Pimentel, Wallace S.
; Pinheiro, Aislan H. B.
; Souza, Paulo M. S.
; Costa, Luiz A. A.
; Teixeira, Marjory M. P.
; Ohashi, Leonardo P.
; Bublitz, Caroline
; Begot, Isis
; Moreira, Rita Simone L
; Hossne Jr, Nelson A.
; Vargas, Guilherme F.
; Branco, João Nelson R.
; Teles, Carlos A.
; Medeiros, Eduardo A. S.
; Sáfadi, Camila
; Rampinelli, Amândio
; Moratelli Neto, Leopoldo
; Rosado, Anderson Rosa
; Mesacasa, Franciele Kuhn
; Capriata, Ismael Escobar
; Segalote, Rodrigo Coelho
; Palmieri, Deborah Louize da Rocha Vianna
; Jardim, Amanda Cristina Mendes
; Vianna, Diego Sarty
; Coutinho, Joaquim Henrique de Souza Aguiar
; Jazbik, João Carlos
; Coutinho, Henrique Madureira da Rocha
; Kikuta, Gustavo
; Almeida, Zely Sant'Anna Marotti de
; Feguri, Gibran Roder
; Lima, Paulo Ruiz Lucio de
; Franco, Anna Carolina
; Borges, Danilo de Cerqueira
; Cruz, Felipe Ramos Honorato De La
; Croti, Ulisses Alexandre
; Borim, Bruna Cury
; Marchi, Carlos Henrique De
; Goraieb, Lilian
; Postigo, Karolyne Barroca Sanches
; Jucá, Fabiano Gonçalves
; Oliveira, Fátima Rosane de Almeida
; Souza, Rafael Bezerra de
; Zilli, Alexandre Cabral
; Mas, Raul Gaston Sanchez
; Bettiati Junior, Luiz Carlos
; Tranchesi, Ricardo
; Bertini Jr, Ayrton
; Franco, Leandro Vieira
; Fernandes, Priscila
; Oliveira, Fabiana
; Moraes Jr, Roberto
; Araújo, Thiago Cavalcanti Vila Nova de
; Braga, Otávio Penna
; Pedrosa Sobrinho, Antônio Cavalcanti
; Teixeira, Roberta Tavares Barreto
; Camboim, Irla Lavor Lucena
; Gomes, Eduardo Nascimento
; Reis, Pedro Horigushi
; Garcia, Luara Piovan
; Scorsioni, Nelson Henrique Goes
; Lago, Roberto
; Guizilini, Solange
.
Brazilian Journal of Cardiovascular Surgery
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Abstract Introduction: We investigated the clinical course and outcomes of patients submitted to cardiovascular surgery in Brazil and who had developed symptoms/signs of coronavirus disease 2019 (COVID-19) in the perioperative period. Methods: A retrospective multicenter study including 104 patients who were allocated in three groups according to time of positive real time reverse transcriptase-polymerase chain reaction (RT-PCR) for the SARS-CoV-2 (severe acute respiratory syndrome coronavirus 2): group 1, patients who underwent cardiac surgery > 10 days after positive RT-PCR; group 2, patients with a positive RT-PCR within 10 days before or after surgery; group 3, patients who presented positive RT-PCR > 10 days after surgery. The primary outcome was mortality and secondary outcomes were postoperative complications, intensive care unit (ICU) length of stay, and postoperative days of hospitalization. Results: The three groups were similar with respect to age, the European System of Cardiac Operative Risk Evaluation score, and comorbidities, except hypertension. Postoperative complications and death were significantly higher in groups 2 and 3 than in group 1, and no significant difference between groups 2 and 3 was seen. Group 2 showed a high prevalence of surgery performed as an urgent procedure. Although no significant differences were observed in ICU length of stay, total postoperative hospitalization time was significantly higher in group 3 than in groups 1 and 2. Conclusion: COVID-19 affecting the postoperative period of patients who underwent cardiovascular surgery is associated with a higher rate of morbidity and mortality. Delaying procedures in RT-PCR-positive patients may help reduce risks of perioperative complications and death.
5.
Genetics of Parkinson’s disease in Brazil: a systematic review of monogenic forms
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Santos-Lobato, Bruno L.
; Schumacher-Schuh, Artur
; Mata, Ignacio F.
; Letro, Grace H.
; Braga-Neto, Pedro
; Brandão, Pedro R. P.
; Godeiro-Junior, Clécio O.
; Coletta, Marcus V. Della
; Camargos, Sarah T.
; Borges, Vanderci
; Rieder, Carlos R. M.
; Tumas, Vitor
.
RESUMO Introdução: Um número crescente de mutações causando formas monogênicas de doença de Parkinson (DP) tem sido descrito, principalmente entre pacientes da Europa e da América do Norte. Como a arquitetura genética varia entre diferentes populações, entender os perfis genéticos específicos de pacientes brasileiros é essencial para um melhor aconselhamento genético e para a seleção de participantes para ensaios clínicos. Objetivo: Revisão sistemática para identificar estudos genéticos brasileiros na área e definir o cenário para estudos futuros das formas monogênicas de DP no Brasil. Métodos: Nós pesquisamos as bases de dados MEDLINE, EMBASE e Web of Science desde a criação até dezembro de 2019, usando termos para “Parkinson’s disease”, “genetics” e “Brazil”. A extração de dados foi feita por dois revisores independentes. Para os genes LRRK2 e PRKN, calculamos a prevalência estimada para cada estudo e realizamos uma meta-análise. Resultados: Um total de 32 estudos foram incluídos e 94 pacientes brasileiros com DP com mutações causativas foram identificados em 2872 pacientes avaliados (3.2%). As mutações no PRKN causaram DP em 48 de 576 pacientes (8.3%). As mutações no LRRK2 foram identificadas em 40 de 1566 pacientes (2.5%), sendo a mutação mais comum a p.G2019S (2.2%). Conclusões: As mutações na PRKN são a causa mais comum de DP autossômica recessiva, e as mutações no LRRK2 a causa mais comum de DP autossômica dominante. Nós observamos uma falta de estudos epidemiológicos robustos em genética de DP, especialmente por não levar em conta a diversidade de nossa população.
ABSTRACT Background: Increasing numbers of mutations causing monogenic forms of Parkinson's disease (PD) have been described, mostly among patients in Europe and North America. Since genetic architecture varies between different populations, studying the specific genetic profile of Brazilian patients is essential for improving genetic counseling and for selecting patients for clinical trials. Objective: We conducted a systematic review to identify genetic studies on Brazilian patients and to set a background for future studies on monogenic forms of PD in Brazil. Methods: We searched MEDLINE, EMBASE and Web of Science from inception to December 2019 using terms for "Parkinson's disease", "genetics" and "Brazil". Two independent reviewers extracted the data. For the genes LRRK2 and PRKN, the estimated prevalence was calculated for each study, and a meta-analysis was performed. Results: A total of 32 studies were included, comprising 94 Brazilian patients with PD with a causative mutation, identified from among 2,872 screened patients (3.2%). PRKN mutations were causative of PD in 48 patients out of 576 (8.3%). LRRK2 mutations were identified in 40 out of 1,556 patients (2.5%), and p.G2019S was the most common mutation (2.2%). Conclusions: PRKN is the most common autosomal recessive cause of PD, and LRRK2 is the most common autosomal dominant form. We observed that there was a lack of robust epidemiological studies on PD genetics in Brazil and, especially, that the diversity of Brazil’s population had not been considered.
https://doi.org/10.1590/0004-282x-anp-2020-0409
282 downloads
6.
Diagnostic prediction model for levodopa-induced dyskinesia in Parkinson’s disease
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SANTOS-LOBATO, Bruno Lopes
; SCHUMACHER-SCHUH, Artur F.
; RIEDER, Carlos R. M.
; HUTZ, Mara H.
; BORGES, Vanderci
; FERRAZ, Henrique Ballalai
; MATA, Ignacio F.
; ZABETIAN, Cyrus P.
; TUMAS, Vitor
.
Resumo Introdução: No momento, não há métodos para se predizer o desenvolvimento de discinesias induzidas por levodopa (DIL), uma frequente complicação do tratamento da doença de Parkinson (DP). Preditores clínicos e polimorfismos de nucleotídeo único (SNP) têm sido associados às DIL na DP. Objetivo: Investigar a associação entre variáveis clínicas e genéticas com as DIL e desenvolver um modelo de predição diagnóstica de DIL na DP. Métodos: Foram avaliados 430 pacientes com DP em uso de levodopa. A presença de DIL foi definida como escore ≥1 no item 4.1 da MDS-UPDRS Parte IV. Nós testamos a associação entre variáveis clínicas específicas e sete SNPs com o desenvolvimento de DIL, usando modelos de regressão logística. Resultados: Em relação às variáveis clínicas, idade de início da doença, duração da doença, sintomas motores iniciais e uso de agonistas dopaminérgicos estiveram associados às DIL. Apenas o genótipo CC do SNP rs2298383 no gene ADORA2A esteve associado com DIL após o ajuste. Nós desenvolvemos dois modelos preditivos diagnósticos com acurácia razoável, mas sugerimos o uso do modelo preditivo clínico. Esse modelo de predição tem uma área sob a curva de 0,817 (intervalo de confiança de 95% [IC95%] 0,77‒0,85) e sem perda significativa de ajuste (teste de qualidade de ajuste de Hosmer-Lemeshow p=0,61). Conclusão: A probabilidade prevista de DIL pode ser estimada, com acurácia razoável, por meio do uso de um modelo preditivo diagnóstico clínico, que combina a idade de início da doença, duração da doença, sintomas motores iniciais e uso de agonistas dopaminérgicos.
Abstract Background: There are currently no methods to predict the development of levodopa-induced dyskinesia (LID), a frequent complication of Parkinson's disease (PD) treatment. Clinical predictors and single nucleotide polymorphisms (SNP) have been associated to LID in PD. Objective: To investigate the association of clinical and genetic variables with LID and to develop a diagnostic prediction model for LID in PD. Methods: We studied 430 PD patients using levodopa. The presence of LID was defined as an MDS-UPDRS Part IV score ≥1 on item 4.1. We tested the association between specific clinical variables and seven SNPs and the development of LID, using logistic regression models. Results: Regarding clinical variables, age of PD onset, disease duration, initial motor symptom and use of dopaminergic agonists were associated to LID. Only CC genotype of ADORA2A rs2298383 SNP was associated to LID after adjustment. We developed two diagnostic prediction models with reasonable accuracy, but we suggest that the clinical prediction model be used. This prediction model has an area under the curve of 0.817 (95% confidence interval [95%CI] 0.77‒0.85) and no significant lack of fit (Hosmer-Lemeshow goodness-of-fit test p=0.61). Conclusion: Predicted probability of LID can be estimated with reasonable accuracy using a diagnostic clinical prediction model which combines age of PD onset, disease duration, initial motor symptom and use of dopaminergic agonists.
https://doi.org/10.1590/0004-282x20190191
1179 downloads
7.
Avaliação da qualidade de açúcares mascavado
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Silva, Rodrigo F. da
; Bueno, Ana Carolina
; Ramos, Pedro J.R.B.
; Orlandi, Raphael D.M.
; Borges, Maria T.M.R.
; Medeiros, Simone D. Sartorio de
; Ceccato-Antonini, Sandra R.
; Martin, José Guilherme P.
; Spoto, Marta H. F.
; Verruma-Bernardi, Marta R.
.
São necessários estudos que definam um “padrão de qualidade” de um determinado produto. Nesse sentido, as avaliações ligadas aos variados aspectos dos alimentos, sejam eles de indicações nutricionais, físico-químicos ou sensoriais, apresentam-se como importantes ferramentas na definição da qualidade do produto. O trabalho teve como objetivo analisar a qualidade de quinze marcas de açúcar mascavado. Quanto à humidade, todas as marcas estavam dentro do relatado pela literatura apresentando duas delas um valor de Aw maior que 0,60. Quatro marcas apresentaram-se fora do limite estabelecido do padrão internacional para bactérias mesófilas e duas marcas não conformes para bolores e leveduras. Quanto a analise sensorial, os açúcares apresentaram diferenças na cor, aparência húmida, gosto doce e textura granulosa, porém estas diferenças não afetaram a preferência para este grupo de consumidores.
Studies which lead to a pointing that aims at defining a qualitative positioning of a certain product are necessary. In this sense, the evaluations related to the various aspects of the foods, being them of nutritional indications, physicochemical or sensory, are important tools in pointing the quality of the product. This work aimed at analyzing the quality of fifteen brands of brown sugars. Regarding moisture, all brands were inside what is reported by the literature and two brands presented Aw higher than 0.60. Four brands stayed outside the limit established by the international standard for mesophilic bacteria and two brands were not in accordance for molds and yeasts. The sugars presented sensory difference for color, humid appearance, sweet taste and grainy texture; however, for this group of consumers, these differences did not affect preference.
https://doi.org/10.19084/RCA18077
558 downloads
8.
Bacterial Cellulose Production by Komagataeibacter hansenii ATCC 23769 Using Sisal Juice - An Agroindustry Waste
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Lima, H. L. S.
; Nascimento, E. S.
; Andrade, F. K.
; Brígida, A. I. S.
; Borges, M. F.
; Cassales, A. R.
; Muniz, C. R.
; Souza Filho, M. de S. M.
; Morais, J. P. S.
; Rosa, M. de F.
.
ABSTRACT In this study, we have optimized production of bacterial cellulose (BC) by Komagataeibacter hansenii ATCC 23769 in a static cultivation using sisal juice, an agroindustrial residue, as substrate. Optimization of fermentation parameters has been carried out using the one-variable-at-a-time method. Effect of initial sugar concentration, pH, nitrogen supplement, and cultivation time was evaluated. The influence of nitrogen source and quantity for bacterial cellulose production was studied using a central composite rotational design (CCRD).The highest production of BC (3.38 g/L) was obtained after 10 days of cultivation, using sisal juice (pH 5) at 15 g/L of sugars and supplemented with 7.5 g/L of extract yeast. The cellulose production yield in selected sisal culture conditions was three times higher than the yield in synthetic medium, indicating that sisal juice is a suitable substrate for BC production.
https://doi.org/10.1590/0104-6632.20170343s20150514
3630 downloads
9.
Growing knowledge: an overview of Seed Plant diversity in Brazil
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Zappi, Daniela C.
; Filardi, Fabiana L. Ranzato
; Leitman, Paula
; Souza, Vinícius C.
; Walter, Bruno M.T.
; Pirani, José R.
; Morim, Marli P.
; Queiroz, Luciano P.
; Cavalcanti, Taciana B.
; Mansano, Vidal F.
; Forzza, Rafaela C.
; Abreu, Maria C.
; Acevedo-Rodríguez, Pedro
; Agra, Maria F.
; Almeida Jr., Eduardo B.
; Almeida, Gracineide S.S.
; Almeida, Rafael F.
; Alves, Flávio M.
; Alves, Marccus
; Alves-Araujo, Anderson
; Amaral, Maria C.E.
; Amorim, André M.
; Amorim, Bruno
; Andrade, Ivanilza M.
; Andreata, Regina H.P.
; Andrino, Caroline O.
; Anunciação, Elisete A.
; Aona, Lidyanne Y.S.
; Aranguren, Yani
; Aranha Filho, João L.M.
; Araújo, Andrea O.
; Araújo, Ariclenes A.M.
; Araújo, Diogo
; Arbo, María M.
; Assis, Leandro
; Assis, Marta C.
; Assunção, Vivian A.
; Athiê-Souza, Sarah M.
; Azevedo, Cecilia O.
; Baitello, João B.
; Barberena, Felipe F.V.A.
; Barbosa, Maria R.V.
; Barros, Fábio
; Barros, Lucas A.V.
; Barros, Michel J.F.
; Baumgratz, José F.A.
; Bernacci, Luis C.
; Berry, Paul E.
; Bigio, Narcísio C.
; Biral, Leonardo
; Bittrich, Volker
; Borges, Rafael A.X.
; Bortoluzzi, Roseli L.C.
; Bove, Cláudia P.
; Bovini, Massimo G.
; Braga, João M.A.
; Braz, Denise M.
; Bringel Jr., João B.A.
; Bruniera, Carla P.
; Buturi, Camila V.
; Cabral, Elza
; Cabral, Fernanda N.
; Caddah, Mayara K.
; Caires, Claudenir S.
; Calazans, Luana S.B.
; Calió, Maria F.
; Camargo, Rodrigo A.
; Campbell, Lisa
; Canto-Dorow, Thais S.
; Carauta, Jorge P.P.
; Cardiel, José M.
; Cardoso, Domingos B.O.S.
; Cardoso, Leandro J.T.
; Carneiro, Camila R.
; Carneiro, Cláudia E.
; Carneiro-Torres, Daniela S.
; Carrijo, Tatiana T.
; Caruzo, Maria B.R.
; Carvalho, Maria L.S.
; Carvalho-Silva, Micheline
; Castello, Ana C.D.
; Cavalheiro, Larissa
; Cervi, Armando C.
; Chacon, Roberta G.
; Chautems, Alain
; Chiavegatto, Berenice
; Chukr, Nádia S.
; Coelho, Alexa A.O.P.
; Coelho, Marcus A.N.
; Coelho, Rubens L.G.
; Cordeiro, Inês
; Cordula, Elizabeth
; Cornejo, Xavier
; Côrtes, Ana L.A.
; Costa, Andrea F.
; Costa, Fabiane N.
; Costa, Jorge A.S.
; Costa, Leila C.
; Costa-e-Silva, Maria B.
; Costa-Lima, James L.
; Cota, Maria R.C.
; Couto, Ricardo S.
; Daly, Douglas C.
; De Stefano, Rodrigo D.
; De Toni, Karen
; Dematteis, Massimiliano
; Dettke, Greta A.
; Di Maio, Fernando R.
; Dórea, Marcos C.
; Duarte, Marília C.
; Dutilh, Julie H.A.
; Dutra, Valquíria F.
; Echternacht, Lívia
; Eggers, Lilian
; Esteves, Gerleni
; Ezcurra, Cecilia
; Falcão Junior, Marcus J.A.
; Feres, Fabíola
; Fernandes, José M.
; Ferreira, D.M.C.
; Ferreira, Fabrício M.
; Ferreira, Gabriel E.
; Ferreira, Priscila P.A.
; Ferreira, Silvana C.
; Ferrucci, Maria S.
; Fiaschi, Pedro
; Filgueiras, Tarciso S.
; Firens, Marcela
; Flores, Andreia S.
; Forero, Enrique
; Forster, Wellington
; Fortuna-Perez, Ana P.
; Fortunato, Reneé H.
; Fraga, Cléudio N.
; França, Flávio
; Francener, Augusto
; Freitas, Joelcio
; Freitas, Maria F.
; Fritsch, Peter W.
; Furtado, Samyra G.
; Gaglioti, André L.
; Garcia, Flávia C.P.
; Germano Filho, Pedro
; Giacomin, Leandro
; Gil, André S.B.
; Giulietti, Ana M.
; A.P.Godoy, Silvana
; Goldenberg, Renato
; Gomes da Costa, Géssica A.
; Gomes, Mário
; Gomes-Klein, Vera L.
; Gonçalves, Eduardo Gomes
; Graham, Shirley
; Groppo, Milton
; Guedes, Juliana S.
; Guimarães, Leonardo R.S.
; Guimarães, Paulo J.F.
; Guimarães, Elsie F.
; Gutierrez, Raul
; Harley, Raymond
; Hassemer, Gustavo
; Hattori, Eric K.O.
; Hefler, Sonia M.
; Heiden, Gustavo
; Henderson, Andrew
; Hensold, Nancy
; Hiepko, Paul
; Holanda, Ana S.S.
; Iganci, João R.V.
; Imig, Daniela C.
; Indriunas, Alexandre
; Jacques, Eliane L.
; Jardim, Jomar G.
; Kamer, Hiltje M.
; Kameyama, Cíntia
; Kinoshita, Luiza S.
; Kirizawa, Mizué
; Klitgaard, Bente B.
; Koch, Ingrid
; Koschnitzke, Cristiana
; Krauss, Nathália P.
; Kriebel, Ricardo
; Kuntz, Juliana
; Larocca, João
; Leal, Eduardo S.
; Lewis, Gwilym P.
; Lima, Carla T.
; Lima, Haroldo C.
; Lima, Itamar B.
; Lima, Laíce F.G.
; Lima, Laura C.P.
; Lima, Leticia R.
; Lima, Luís F.P.
; Lima, Rita B.
; Lírio, Elton J.
; Liro, Renata M.
; Lleras, Eduardo
; Lobão, Adriana
; Loeuille, Benoit
; Lohmann, Lúcia G.
; Loiola, Maria I.B.
; Lombardi, Julio A.
; Longhi-Wagner, Hilda M.
; Lopes, Rosana C.
; Lorencini, Tiago S.
; Louzada, Rafael B.
; Lovo, Juliana
; Lozano, Eduardo D.
; Lucas, Eve
; Ludtke, Raquel
; Luz, Christian L.
; Maas, Paul
; Machado, Anderson F.P.
; Macias, Leila
; Maciel, Jefferson R.
; Magenta, Mara A.G.
; Mamede, Maria C.H.
; Manoel, Evelin A.
; Marchioretto, Maria S.
; Marques, Juliana S.
; Marquete, Nilda
; Marquete, Ronaldo
; Martinelli, Gustavo
; Martins da Silva, Regina C.V.
; Martins, Ângela B.
; Martins, Erika R.
; Martins, Márcio L.L.
; Martins, Milena V.
; Martins, Renata C.
; Matias, Ligia Q.
; Maya-L., Carlos A.
; Mayo, Simon
; Mazine, Fiorella
; Medeiros, Debora
; Medeiros, Erika S.
; Medeiros, Herison
; Medeiros, João D.
; Meireles, José E.
; Mello-Silva, Renato
; Melo, Aline
; Melo, André L.
; Melo, Efigênia
; Melo, José I.M.
; Menezes, Cristine G.
; Menini Neto, Luiz
; Mentz, Lilian A.
; Mezzonato, A.C.
; Michelangeli, Fabián A.
; Milward-de-Azevedo, Michaele A.
; Miotto, Silvia T.S.
; Miranda, Vitor F.O.
; Mondin, Cláudio A.
; Monge, Marcelo
; Monteiro, Daniele
; Monteiro, Raquel F.
; Moraes, Marta D.
; Moraes, Pedro L.R.
; Mori, Scott A.
; Mota, Aline C.
; Mota, Nara F.O.
; Moura, Tania M.
; Mulgura, Maria
; Nakajima, Jimi N.
; Nardy, Camila
; Nascimento Júnior, José E.
; Noblick, Larry
; Nunes, Teonildes S.
; O'Leary, Nataly
; Oliveira, Arline S.
; Oliveira, Caetano T.
; Oliveira, Juliana A.
; Oliveira, Luciana S.D.
; Oliveira, Maria L.A.A.
; Oliveira, Regina C.
; Oliveira, Renata S.
; Oliveira, Reyjane P.
; Paixão-Souza, Bruno
; Parra, Lara R.
; Pasini, Eduardo
; Pastore, José F.B.
; Pastore, Mayara
; Paula-Souza, Juliana
; Pederneiras, Leandro C.
; Peixoto, Ariane L.
; Pelissari, Gisela
; Pellegrini, Marco O.O.
; Pennington, Toby
; Perdiz, Ricardo O.
; Pereira, Anna C.M.
; Pereira, Maria S.
; Pereira, Rodrigo A.S.
; Pessoa, Clenia
; Pessoa, Edlley M.
; Pessoa, Maria C.R.
; Pinto, Luiz J.S.
; Pinto, Rafael B.
; Pontes, Tiago A.
; Prance, Ghillean T.
; Proença, Carolyn
; Profice, Sheila R.
; Pscheidt, Allan C.
; Queiroz, George A.
; Queiroz, Rubens T.
; Quinet, Alexandre
; Rainer, Heimo
; Ramos, Eliana
; Rando, Juliana G.
; Rapini, Alessandro
; Reginato, Marcelo
; Reis, Ilka P.
; Reis, Priscila A.
; Ribeiro, André R.O.
; Ribeiro, José E.L.S.
; Riina, Ricarda
; Ritter, Mara R.
; Rivadavia, Fernando
; Rocha, Antônio E.S.
; Rocha, Maria J.R.
; Rodrigues, Izabella M.C.
; Rodrigues, Karina F.
; Rodrigues, Rodrigo S.
; Rodrigues, Rodrigo S.
; Rodrigues, Vinícius T.
; Rodrigues, William
; Romaniuc Neto, Sérgio
; Romão, Gerson O.
; Romero, Rosana
; Roque, Nádia
; Rosa, Patrícia
; Rossi, Lúcia
; Sá, Cyl F.C.
; Saavedra, Mariana M.
; Saka, Mariana
; Sakuragui, Cássia M.
; Salas, Roberto M.
; Sales, Margareth F.
; Salimena, Fatima R.G.
; Sampaio, Daniela
; Sancho, Gisela
; Sano, Paulo T.
; Santos, Alessandra
; Santos, Élide P.
; Santos, Juliana S.
; Santos, Marianna R.
; Santos-Gonçalves, Ana P.
; Santos-Silva, Fernanda
; São-Mateus, Wallace
; Saraiva, Deisy P.
; Saridakis, Dennis P.
; Sartori, Ângela L.B.
; Scalon, Viviane R.
; Schneider, Ângelo
; Sebastiani, Renata
; Secco, Ricardo S.
; Senna, Luisa
; Senna-Valle, Luci
; Shirasuna, Regina T.
; Silva Filho, Pedro J.S.
; Silva, Anádria S.
; Silva, Christian
; Silva, Genilson A.R.
; Silva, Gisele O.
; Silva, Márcia C.R.
; Silva, Marcos J.
; Silva, Marcos J.
; Silva, Otávio L.M.
; Silva, Rafaela A.P.
; Silva, Saura R.
; Silva, Tania R.S.
; Silva-Gonçalves, Kelly C.
; Silva-Luz, Cíntia L.
; Simão-Bianchini, Rosângela
; Simões, André O.
; Simpson, Beryl
; Siniscalchi, Carolina M.
; Siqueira Filho, José A.
; Siqueira, Carlos E.
; Siqueira, Josafá C.
; Smith, Nathan P.
; Snak, Cristiane
; Soares Neto, Raimundo L.
; Soares, Kelen P.
; Soares, Marcos V.B.
; Soares, Maria L.
; Soares, Polyana N.
; Sobral, Marcos
; Sodré, Rodolfo C.
; Somner, Genise V.
; Sothers, Cynthia A.
; Sousa, Danilo J.L.
; Souza, Elnatan B.
; Souza, Élvia R.
; Souza, Marcelo
; Souza, Maria L.D.R.
; Souza-Buturi, Fátima O.
; Spina, Andréa P.
; Stapf, María N.S.
; Stefano, Marina V.
; Stehmann, João R.
; Steinmann, Victor
; Takeuchi, Cátia
; Taylor, Charlotte M.
; Taylor, Nigel P.
; Teles, Aristônio M.
; Temponi, Lívia G.
; Terra-Araujo, Mário H.
; Thode, Veronica
; Thomas, W.Wayt
; Tissot-Squalli, Mara L.
; Torke, Benjamin M.
; Torres, Roseli B.
; Tozzi, Ana M.G.A.
; Trad, Rafaela J.
; Trevisan, Rafael
; Trovó, Marcelo
; Valls, José F.M.
; Vaz, Angela M.S.F.
; Versieux, Leonardo
; Viana, Pedro L.
; Vianna Filho, Marcelo D.M.
; Vieira, Ana O.S.
; Vieira, Diego D.
; Vignoli-Silva, Márcia
; Vilar, Thaisa
; Vinhos, Franklin
; Wallnöfer, Bruno
; Wanderley, Maria G.L.
; Wasshausen, Dieter
; Watanabe, Maurício T.C.
; Weigend, Maximilian
; Welker, Cassiano A.D.
; Woodgyer, Elizabeth
; Xifreda, Cecilia C.
; Yamamoto, Kikyo
; Zanin, Ana
; Zenni, Rafael D.
; Zickel, Carmem S
.
Resumo Um levantamento atualizado das plantas com sementes e análises relevantes acerca desta biodiversidade são apresentados. Este trabalho se iniciou em 2010 com a publicação do Catálogo de Plantas e Fungos e, desde então vem sendo atualizado por mais de 430 especialistas trabalhando online. O Brasil abriga atualmente 32.086 espécies nativas de Angiospermas e 23 espécies nativas de Gimnospermas e estes novos dados mostram um aumento de 3% da riqueza em relação a 2010. A Amazônia é o Domínio Fitogeográfico com o maior número de espécies de Gimnospermas, enquanto que a Floresta Atlântica possui a maior riqueza de Angiospermas. Houve um crescimento considerável no número de espécies e nas taxas de endemismo para a maioria dos Domínios (Caatinga, Cerrado, Floresta Atlântica, Pampa e Pantanal), com exceção da Amazônia que apresentou uma diminuição de 2,5% de endemicidade. Entretanto, a maior parte das plantas com sementes que ocorrem no Brasil (57,4%) é endêmica deste território. A proporção de formas de vida varia de acordo com os diferentes Domínios: árvores são mais expressivas na Amazônia e Floresta Atlântica do que nos outros biomas, ervas são dominantes no Pampa e as lianas apresentam riqueza expressiva na Amazônia, Floresta Atlântica e Pantanal. Este trabalho não só quantifica a biodiversidade brasileira, mas também indica as lacunas de conhecimento e o desafio a ser enfrentado para a conservação desta flora.
Abstract An updated inventory of Brazilian seed plants is presented and offers important insights into the country's biodiversity. This work started in 2010, with the publication of the Plants and Fungi Catalogue, and has been updated since by more than 430 specialists working online. Brazil is home to 32,086 native Angiosperms and 23 native Gymnosperms, showing an increase of 3% in its species richness in relation to 2010. The Amazon Rainforest is the richest Brazilian biome for Gymnosperms, while the Atlantic Rainforest is the richest one for Angiosperms. There was a considerable increment in the number of species and endemism rates for biomes, except for the Amazon that showed a decrease of 2.5% of recorded endemics. However, well over half of Brazillian seed plant species (57.4%) is endemic to this territory. The proportion of life-forms varies among different biomes: trees are more expressive in the Amazon and Atlantic Rainforest biomes while herbs predominate in the Pampa, and lianas are more expressive in the Amazon, Atlantic Rainforest, and Pantanal. This compilation serves not only to quantify Brazilian biodiversity, but also to highlight areas where there information is lacking and to provide a framework for the challenge faced in conserving Brazil's unique and diverse flora.
https://doi.org/10.1590/2175-7860201566411
33340 downloads
10.
Freund's adjuvant-induced inflammation: clinical findings and its effect on hepcidin mRNA expression in horses
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Oliveira-Filho, José P.
; Badial, Peres R.
; Cunha, Paulo Henrique J.
; Bordon, Ana Paula
; Araujo Jr, João P.
; Divers, Thomas J.
; Winand, Nena J.
; Borges, Alexandre S.
.
A hipoferremia observada durante os processos inflamatórios sistêmicos é mediada pela hepcidina. O aumento da expressão da hepcidina é particularmente importante durante a inflamação aguda, por restringir a disponibilidade de ferro necessária para o crescimento de microrganismos patogênicos antes que a imunidade adaptativa ocorra. O objetivo deste estudo foi avaliar os achados clínicos e a expressão hepática do RNA mensageiro (RNAm) da hepcidina em cavalos após a indução da inflamação com Adjuvante completo de Freund (FCA). A expressão hepática do RNAm da hepcidina foi determinada em cavalos sadios após duas administrações intramusculares de FCA às 0 h (M0) e 12 h (M12). As concentrações plasmáticas de ferro e fibrinogênio foram mensuradas em múltiplos momentos entre 0 h e 240 h (M240) após a primeira administração de FCA (PI). A expressão do RNAm da hepcidina foi determinada por RT-qPCR usando amostras de biopsias hepáticas colhidas as 0 h (controle), 6 h (M6) e 18 h (M18) PI. A concentração plasmática média de fibrinogênio foi estatisticamente diferente do M0 entre 120 h e 216 h PI. A concentração plasmática média de ferro foi significantemente menor que o controle entre 16 h e 72 h PI, alcançou o nível mais baixo às 30 h PI (33% do valor inicial) e retornou aos valores de referência entre 96 h PI e até o final do experimento. A expressão do RNAm da hepcidina aumentou no M6 e permaneceu alta no M18. A concentração plasmática de ferro foi um indicador precoce da inflamação quando comparada com o fibrinogênio e pode ser útil na detecção precoce da inflamação em cavalos. A administração do FCA causou um rápido início da hipoferremia, e isto foi resultante do aumento da expressão hepática da hepcidina. Estes resultados enfatizam a importância da hepcidina e do metabolismo do ferro durante a inflamação em cavalos.
Hypoferremia observed during systemic inflammatory disorders is regulated by hepcidin. Hepcidin up-regulation is particularly important during acute inflammation, as it restricts the availability of iron, which is necessary for pathogenic microorganism growth before adaptive immunity occurs. The aim of this study was to evaluate the clinical findings and hepatic hepcidin mRNA expression in horses using a Freund's complete adjuvant (FCA) model of inflammation. The expression of hepcidin mRNA in the liver was determined in healthy horses following two intramuscular injections of FCA at 0 h and 12 h. Plasma iron and fibrinogen concentrations were measured at multiple time points between 0 h and 240 h post-FCA injection (PI). Hepcidin mRNA expression was determined by RT-qPCR using liver biopsy samples performed at 0 h (control), 6 h and 18 h PI. The mean plasma fibrinogen level was significantly different from the control values only between 120 and 216 h PI. The mean plasma iron level was significantly lower than the control between 16 and 72 h PI, reaching the lowest levels at 30 h PI (33 % of the initial value), and returned to the reference value from 96 h PI to the end of the experiment. Hepcidin mRNA expression increased at 6 h PI and remained high at 18 h PI. The iron plasma concentration was an earlier indicator of inflammatory processes in horses when compared with fibrinogen and might be useful for the early detection of inflammation in the horse. FCA administration caused the rapid onset of hypoferremia, and this effect was likely the result of up-regulated hepatic hepcidin gene expression. This study emphasizes the importance of hepcidin and iron metabolism during inflammation in horses.
2269 downloads
11.
Chemical variability in the essential oils from leaves of Syzygium jambos
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Syzygium jambos (L.) Alston, Myrtaceae, occurs in tropical regions and is a widespread medicinal plant used to treat several diseases, such as hemorrhage, dysentery, diabetes, inflammation, diabetes and gastrointestinal disorders. Leaf essential oils of ten specimens of S. jambos collected from two localities of Central Brazilian Cerrado were investigated by GC-MS. Soil and foliar nutrients were analyzed to determine the mineral compositions. The aims of this study was to evaluate the influence of environmental factors on chemical composition of leaf essential oils of S. jambos. Studies on the influence of environmental factors over composition of essential oils are important because they contribute data for its cultivation, harvest and establish parameters to essential oil components. The data were analyzed using stepwise Multiple Regression and Cluster Analysis, and the results suggest that the main factor capable to influence the chemical composition of leaf essential oils was the collection period and the collection site had a minor effect. The results also suggest that the leaf essential oils composition was influenced mainly by foliar nutrients (N, Mn, Co, Fe, S and Mg) and soil nutrients (Na, Al, S and H+Al). The compound with the best model obtained was the (E)-caryophyllene, with a coefficient of determination equal 0.8113.
2796 downloads
12.
Optically transparent membrane based on bacterial cellulose/polycaprolactone
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Barud, H. S.
; Ribeiro, S. J. L.
; Carone, C. L. P
; Ligabue, R.
; Einloft, Sandra
; Queiroz, P. V. S.
; Borges, A. P. B.
; Jahno, V. D.
.
Optically transparent membranes from bacterial cellulose (BC)/polycaprolactone (PCL) have been prepared by impregnation of PCL acetone solution into dried BC membranes. UV-Vis measurements showed an increase on transparency in BC/PCL membrane when compared with pristine BC. The good transparency of the BC/PCL can be related to the presence of BC nanofibers associated with deposit of PCL nano-sized spherulites which are smaller than the wavelength of visible light and practically free of light scattering. XRD results show that cellulose type I structure is preserved inside the BC/PCL membrane, while the mechanical properties suggested indicated that PCL acts as a plasticizer for the BC membrane. The novel BC/PCL membrane could be used for preparation of fully biocompatible flexible display and biodegradable food packaging.
4023 downloads
13.
Essential oils in aerial parts of Myrcia tomentosa: composition and variability
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Sá, Fabyola A. S.
; Borges, Leonardo L.
; Paula, Joelma A. M.
; Sampaio, Bruno L.
; Ferri, Pedro H.
; Paula, José R.
.
Species in the Myrtaceae family are used in folk medicine to treat gastrointestinal disorders, infectious diseases and hemorrhagic conditions and are known for their essential oil contents. Gas chromatography coupled with mass spectrometry (GC-MS) was used to characterize the chemical composition of essential oils of the leaves, stem bark and flowers of Myrcia tomentosa (Aubl.) DC., as well as to assess the chemical variability in the constituents of the essential oils of the leaf. Soil and foliar analyses were also performed to determine the mineral compositions. Principal component analysis (PCA) was used to examine the interrelationships between the obtained data. The most abundant component in the essential oils of the flowers was (2E,6E)-methyl farnesoate, whereas hexadecanoic acid was the most abundant essential oil component in the stem bark. The leaf essential oils showed seasonal variation in their chemical composition, with bicyclogermacrene and (2E,6E)-methyl farnesoate as the major chemical components. Forty-four constituents were identified, and only nine compounds were found in all of the samples. Sesquiterpenes were mainly produced in the flowers and leaves. The PCA showed a positive correlation between the oxygenated sesquiterpenes and the foliar nutrients Cu and P. Significant statistical correlations were verified between the climatic data, foliar nutrients and essential oil compositions.
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14.
Compósito cimentício reforçado com fibras de carbono para recuperação de monumentos históricos
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O intemperismo, como fenômeno natural, atinge não somente materiais produzidos pelo homem, como também construções feitas de rochas naturais. No entanto, a evolução intempérica geralmente ocorre em ritmo muito lento em relação à duração dos empreendimentos humanos. Contudo, há situações em que este se acelera, afetando as obras de engenharia, sobretudo as obras de arte, monumentos históricos e fachadas de igrejas consideradas patrimônio da humanidade. O presente trabalho investigou o efeito da adição de fibra de carbono em compósitos cimentícios de resíduos de esteatito visando à recuperação de peças confeccionadas com este mineral, popularmente conhecido como "pedra-sabão". As propriedades físico-mecânicas tais como, densidade volumétrica e resistência mecânica à flexão foram investigadas neste experimento. Concluiu-se que a adição de fibra de carbono aumenta significativamente a resistência mecânica dos compósitos além da redução de seu peso específico, permitindo o reaproveitamento de um maior percentual de resíduos de esteatito no compósito final.
Weathering is a natural phenomenon that affects both the engineering materials and natural rocks used for construction. The weathering evolution generally occurs at a slow pace when compared with the overall durability of the construction elements. However, in some cases the weathering may develop much quicker, affecting the engineering constructions and also historical buildings such as monuments and churches. This work investigated the effect of carbon fibre addition into cementitious composites made with residues of steatite, a mineral, also known as soapstone, for restoration of craftwork elements. The material's properties, such as bulk density and flexural strength were investigated. It is possible to conclude that the carbon fibre addition increases the flexural strength of the composites and reduces the specific weight, allowing for the use of a significant percentage of steatite in the formulation of the composites.
3607 downloads
15.
Preparation and bactericidal effect of composites based on crosslinked copolymers containing silver nanoparticles
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Maria, Luiz C. de S.
; Oliveira, Rachel O.
; Merçon, Fabio
; Borges, Maria E. R. S. P.
; Barud, Hernane S.
; Ribeiro, Sidney J.L.
; Messaddeq, Younés
; Wang, Shu H.
.
Commercial copolymers based on styrene and divinylbenzene containing sulfonic acid groups were used as support for the incorporation of silver nanoparticles. These nanoparticles were obtained in situ by the reduction of Ag+ by using hydroxylamine in the presence of a protective agent. These materials were characterized with determination of the silver content and their morphological characteristics. The antibacterial activity of the final products against Escherichia coli was evaluated and the results show that the synthesized copolymers had antibacterial effect varying from 54 to 100%. The most efficient composite was made with small, well distributed particles.
2708 downloads
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