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[SciELO Preprints] - Guidelines on the Diagnosis and Treatment of Hypertrophic Cardiomyopathy – 2024
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Fernandes, Fabio
Simões, Marcus V.
Correia, Edileide de Barros
Marcondes-Braga, Fabiana G.
Coelho-Filho, Otavio Rizzi
Mesquita, Cláudio Tinoco
Mathias-Junior, Wilson
Rochitte, Carlos Eduardo
Ramires, Felix José Alvarez
Alves, Silvia Marinho Martins
Montera, Marcelo Westerlund
Lopes, Renato Delascio
Oliveira-Junior, Mucio Tavares
Scolari, Fernando L.
Avila, Walkiria Samuel
Canesin, Manoel Fernandes
Bacal, Fernando
Bocchi, Edimar Alcides
Moura, Lídia Ana Zytynski
Saad, Eduardo Benchimol
Scanavacca, Mauricio I.
Valdigem, Bruno Pereira
Cano , Manuel Nicolas
Abizaid , Alexandre
Ribeiro, Henrique Barbosa
Lemos-Neto, Pedro Alves
Ribeiro, Gustavo Calado de Aguiar
Jatene, Fabio Biscegli
Dias, Ricardo Ribeiro
Beck-da-Silva, Luis
Rohde, Luis Eduardo P.
Bittencourt, Marcelo Imbroinise
Pereira, Alexandre
Krieger, José Eduardo
Villacorta, Humberto
Martins, Wolney de Andrade
Figueiredo-Neto, José Albuquerque de
Cardoso , Juliano Novaes
Pastore, Carlos Alberto
Jatene, Ieda Biscegli
Tanaka, Ana Cristina Sayuri
Hotta, Viviane Tiemi
Romano, Minna Moreira Dias
Albuquerque, Denilson Campos de
Mourilhe-Rocha, Ricardo
Hajjar, Ludhmila Abrahão
Brito, Fabio Sandoli de
Caramelli , Bruno
Calderaro, Daniela
Farsky, Pedro Silvio
Colafranceschi , Alexandre Siciliano
Pinto, Ibraim Masciarelli
Vieira , Marcelo Luiz Campos
Danzmann, Luiz Claudio
Barberato , Silvio Henrique
Mady, Charles
Martinelli-Filho, Martino
Torbey , Ana Flavia Malheiros
Schwartzmann, Pedro Vellosa
Macedo, Ariane Vieira Scarlatelli
Ferreira , Silvia Moreira Ayub
Schmidt, Andre
Melo , Marcelo Dantas Tavares de
Lima-Filho, Moysés Oliveira
Sposito, Andrei C.
Brito, Flavio de Souza
Biolo, Andreia
Madrini-Junior, Vagner
Rizk, Stéphanie Itala
Mesquita, Evandro Tinoco
A cardiomiopatia hipertrófica (CMH) é uma forma de doença do músculo cardíaco de causa genética, caracterizada pela hipertrofia das paredes ventriculares. O diagnóstico requer detecção por métodos de imagem (Ecocardiograma ou Ressonância Magnética Cardíaca) de qualquer segmento da parede do ventrículo esquerdo com espessura > 15 mm, sem outra causa provável. A análise genética permite identificar mutações de genes codificantes de diferentes estruturas do sarcômero responsáveis pelo desenvolvimento da CMH em cerca de 60% dos casos, permitindo o rastreio de familiares e aconselhamento genético, como parte importante do manejo dos pacientes e familiares. Vários conceitos sobre a CMH foram recentemente revistos, incluindo sua prevalência de 1 em 250 indivíduos, não sendo, portanto, uma doença rara, mas subdiagnosticada. A vasta maioria dos pacientes é assintomática. Naqueles sintomáticos, a obstrução do trato de saída do ventrículo esquerdo (OTSVE) é o principal distúrbio responsável pelos sintomas, devendo-se investigar a sua presença em todos os casos. Naqueles em que o ecocardiograma em repouso ou com Manobra de Valsalva não detecta gradiente intraventricular significativo (> 30 mmHg), devem ser submetidos à ecocardiografia com esforço físico para detecção da OTSVE. Pacientes com sintomas limitantes e grave OTSVE, refratários ao uso de betabloqueadores e verapamil, devem receber terapias de redução septal ou uso de novas drogas inibidoras da miosina cardíaca. Por fim, os pacientes adequadamente identificados com risco aumentado de morta súbita podem receber medida profilática com implante de cardiodesfibrilador implantável (CDI).
La miocardiopatía hipertrófica (MCH) es una forma de enfermedad cardíaca de origen genético, caracterizada por el engrosamiento de las paredes ventriculares. El diagnóstico requiere la detección mediante métodos de imagen (Ecocardiograma o Resonancia Magnética Cardíaca) que muestren algún segmento de la pared ventricular izquierda con un grosor > 15 mm, sin otra causa probable. El análisis genético permite identificar mutaciones en genes que codifican diferentes estructuras del sarcómero responsables del desarrollo de la MCH en aproximadamente el 60% de los casos, lo que permite el tamizaje de familiares y el asesoramiento genético, como parte importante del manejo de pacientes y familiares. Varios conceptos sobre la MCH han sido revisados recientemente, incluida su prevalencia de 1 entre 250 individuos, por lo tanto, no es una enfermedad rara, sino subdiagnosticada. La gran mayoría de los pacientes son asintomáticos. En los casos sintomáticos, la obstrucción del tracto de salida ventricular izquierdo (TSVI) es el trastorno principal responsable de los síntomas, y su presencia debe investigarse en todos los casos. En aquellos en los que el ecocardiograma en reposo o la maniobra de Valsalva no detecta un gradiente intraventricular significativo (> 30 mmHg), deben someterse a ecocardiografía de esfuerzo para detectar la obstrucción del TSVI. Los pacientes con síntomas limitantes y obstrucción grave del TSVI, refractarios al uso de betabloqueantes y verapamilo, deben recibir terapias de reducción septal o usar nuevos medicamentos inhibidores de la miosina cardíaca. Finalmente, los pacientes adecuadamente identificados con un riesgo aumentado de muerte súbita pueden recibir medidas profilácticas con el implante de un cardioversor-desfibrilador implantable (CDI).
Hypertrophic cardiomyopathy (HCM) is a form of genetically caused heart muscle disease, characterized by the thickening of the ventricular walls. Diagnosis requires detection through imaging methods (Echocardiogram or Cardiac Magnetic Resonance) showing any segment of the left ventricular wall with a thickness > 15 mm, without any other probable cause. Genetic analysis allows the identification of mutations in genes encoding different structures of the sarcomere responsible for the development of HCM in about 60% of cases, enabling screening of family members and genetic counseling, as an important part of patient and family management. Several concepts about HCM have recently been reviewed, including its prevalence of 1 in 250 individuals, hence not a rare but rather underdiagnosed disease. The vast majority of patients are asymptomatic. In symptomatic cases, obstruction of the left ventricular outflow tract (LVOT) is the primary disorder responsible for symptoms, and its presence should be investigated in all cases. In those where resting echocardiogram or Valsalva maneuver does not detect significant intraventricular gradient (> 30 mmHg), they should undergo stress echocardiography to detect LVOT obstruction. Patients with limiting symptoms and severe LVOT obstruction, refractory to beta-blockers and verapamil, should receive septal reduction therapies or use new drugs inhibiting cardiac myosin. Finally, appropriately identified patients at increased risk of sudden death may receive prophylactic measure with implantable cardioverter-defibrillator (ICD) implantation.
2.
Catálogo Taxonômico da Fauna do Brasil: Setting the baseline knowledge on the animal diversity in Brazil Brasil
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Boeger, Walter A.
; Valim, Michel P.
; Zaher, Hussam
; Rafael, José A.
; Forzza, Rafaela C.
; Percequillo, Alexandre R.
; Serejo, Cristiana S.
; Garraffoni, André R.S.
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; Linzmeier, Adelita M.
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; Bonecker, Sergio L.C.
; Bueno, Sergio L. de S.
; Almeida, Sérgio M. de
; Stampar, Sérgio N.
; Andena, Sérgio R.
; Posso, Sergio R.
; Lima, Sheila P.
; Gadelha, Sian de S.
; Thiengo, Silvana C.
; Cohen, Simone C.
; Brandão, Simone N.
; Rosa, Simone P.
; Ribeiro, Síria L.B.
; Letana, Sócrates D.
; Santos, Sonia B. dos
; Andrade, Sonia C.S.
; Dávila, Stephane
; Vaz, Stéphanie
; Peck, Stewart B.
; Christo, Susete W.
; Cunha, Suzan B.Z.
; Gomes, Suzete R.
; Duarte, Tácio
; Madeira-Ott, Taís
; Marques, Taísa
; Roell, Talita
; Lima, Tarcilla C. de
; Sepulveda, Tatiana A.
; Maria, Tatiana F.
; Ruschel, Tatiana P.
; Rodrigues, Thaiana
; Marinho, Thais A.
; Almeida, Thaís M. de
; Miranda, Thaís P.
; Freitas, Thales R.O.
; Pereira, Thalles P.L.
; Zacca, Thamara
; Pacheco, Thaynara L.
; Martins, Thiago F.
; Alvarenga, Thiago M.
; Carvalho, Thiago R. de
; Polizei, Thiago T.S.
; McElrath, Thomas C.
; Henry, Thomas
; Pikart, Tiago G.
; Porto, Tiago J.
; Krolow, Tiago K.
; Carvalho, Tiago P.
; Lotufo, Tito M. da C.
; Caramaschi, Ulisses
; Pinheiro, Ulisses dos S.
; Pardiñas, Ulyses F.J.
; Maia, Valéria C.
; Tavares, Valeria
; Costa, Valmir A.
; Amaral, Vanessa S. do
; Silva, Vera C.
; Wolff, Vera R. dos S.
; Slobodian, Verônica
; Silva, Vinícius B. da
; Espíndola, Vinicius C.
; Costa-Silva, Vinicius da
; Bertaco, Vinicius de A.
; Padula, Vinícius
; Ferreira, Vinicius S.
; Silva, Vitor C.P. da
; Piacentini, Vítor de Q.
; Sandoval-Gómez, Vivian E.
; Trevine, Vivian
; Sousa, Viviane R.
; Sant’Anna, Vivianne B. de
; Mathis, Wayne N.
; Souza, Wesley de O.
; Colombo, Wesley D.
; Tomaszewska, Wioletta
; Wosiacki, Wolmar B.
; Ovando, Ximena M.C.
; Leite, Yuri L.R.
.
ABSTRACT The limited temporal completeness and taxonomic accuracy of species lists, made available in a traditional manner in scientific publications, has always represented a problem. These lists are invariably limited to a few taxonomic groups and do not represent up-to-date knowledge of all species and classifications. In this context, the Brazilian megadiverse fauna is no exception, and the Catálogo Taxonômico da Fauna do Brasil (CTFB) (http://fauna.jbrj.gov.br/), made public in 2015, represents a database on biodiversity anchored on a list of valid and expertly recognized scientific names of animals in Brazil. The CTFB is updated in near real time by a team of more than 800 specialists. By January 1, 2024, the CTFB compiled 133,691 nominal species, with 125,138 that were considered valid. Most of the valid species were arthropods (82.3%, with more than 102,000 species) and chordates (7.69%, with over 11,000 species). These taxa were followed by a cluster composed of Mollusca (3,567 species), Platyhelminthes (2,292 species), Annelida (1,833 species), and Nematoda (1,447 species). All remaining groups had less than 1,000 species reported in Brazil, with Cnidaria (831 species), Porifera (628 species), Rotifera (606 species), and Bryozoa (520 species) representing those with more than 500 species. Analysis of the CTFB database can facilitate and direct efforts towards the discovery of new species in Brazil, but it is also fundamental in providing the best available list of valid nominal species to users, including those in science, health, conservation efforts, and any initiative involving animals. The importance of the CTFB is evidenced by the elevated number of citations in the scientific literature in diverse areas of biology, law, anthropology, education, forensic science, and veterinary science, among others. publications problem uptodate up date classifications context exception (CTFB http//fauna.jbrj.gov.br/, httpfaunajbrjgovbr http //fauna.jbrj.gov.br/ , jbrj gov br (http://fauna.jbrj.gov.br/) 2015 Brazil 80 specialists 1 2024 133691 133 691 133,69 125138 125 138 125,13 82.3%, 823 82 3 (82.3% 102000 102 000 102,00 7.69%, 769 7 69 (7.69% 11000 11 11,00 . 3,567 3567 567 (3,56 2,292 2292 2 292 (2,29 1,833 1833 833 (1,83 1,447 1447 447 (1,44 1000 1,00 831 (83 628 (62 606 (60 520 (52 50 users science health biology law anthropology education others http//fauna.jbrj.gov.br/ faunajbrjgovbr //fauna.jbrj.gov.br (http://fauna.jbrj.gov.br/ 201 8 202 13369 13 133,6 12513 12 125,1 82.3% (82.3 10200 10 00 102,0 7.69% 76 6 (7.69 1100 11,0 3,56 356 56 (3,5 2,29 229 29 (2,2 1,83 183 83 (1,8 1,44 144 44 (1,4 100 1,0 (8 62 (6 60 52 (5 5 http//fauna.jbrj.gov.br (http://fauna.jbrj.gov.br 20 1336 133, 1251 125, 82.3 (82. 1020 0 102, 7.69 (7.6 110 11, 3,5 35 (3, 2,2 22 (2, 1,8 18 (1, 1,4 14 4 ( 82. (82 7.6 (7. 3, (3 2, (2 (1 7. (7
3.
Ecological patterns and conservation opportunities with carbon credits in Brazil nut groves: a study-case in the Southeast Amazon groves studycase study case
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Souza, Cléber Rodrigo de
; Baldoni, Aisy B.
; Tonini, Hélio
; Maia, Vinícius Andrade
; Santos, Rubens Manoel dos
; Luvison, Matheus
; Santos, Juliano P.
.
ABSTRACT Background: Brazil Nuts (BN) tree is a species of high importance in Amazon region. Their continuous use by traditional communities is often related to disturbances that lead to larger degraded areas where this species is commonly found (“BN groves”). Here we aimed to explore the ecological patterns of BN groves vegetation and its relationship with BN trees and evaluate their potential as a source of carbon credits. We sampled 15 circular plots, with Brazilian Nut trees as the center (focal trees) and collected morphometric data from the focal trees. Additionally, we evaluated fruit production for a period of 5 years to obtain annual measurements, which were used as a proxy of the anthropic impact associated with the collection process. Through analysis of the data, we: i) examined the effects of BN trees on the adjacent vegetation; ii) quantified the potential amount of carbon credits in the adjacent vegetation and in the focal trees by converting carbon stock to equivalent CO2. Results: The adjacent vegetation structure was influenced by the size of BN trees (focal trees). No important effects of BN trees on the adjacent vegetation floristic composition and functional attributes were found. Additionally, we found that Brazilian Nut groves possess a significant potential for carbon credits that could be leveraged in the future carbon credit market, Conclusion: The study highlights the potential for carbon credit generation in Brazil nut groves in the Southeast Amazon as a means of supporting conservation and restoration efforts in these environments. Background (BN region groves. . groves”) 1 plots Additionally measurements process i ii CO2 CO Results market Conclusion environments groves”
4.
CONSTRUÇÃO DE UM SUPORTE AJUSTÁVEL LAB-MADE IMPRESSO EM 3D PARA MEDIÇÃO DE ÂNGULO DE CONTATO
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Silva, Vinicius A. O. P. da
; Tartare, Vinicius A. P.
; Kalinke, Cristiane
; Oliveira, Paulo Roberto de
; Souza, Daniel Cardoso de
; Bonacin, Juliano A.
; Janegitz, Bruno C.
.
Advances in the use of 3D printing technology have led to the development of new low-cost devices. This technology features high versatility, considering the easy modulation of the materials depending on its objectives and applications. In this sense, we have developed a laboratory-built contact angle measuring device (lab-made). The device was composed by the assembly of 26 3D-printed pieces of different sizes and design printed using acrylonitrile-butadiene-styrene polymer. The device was designed in three main parts. The first part was related to the analysis, with the use of platforms for the sample surfaces positioning. The second part was made to support a micropipette, prepared to add the drop for analysis; and the third for the support of a smartphone, utilized to obtain the images. The device was applied for the measurement of contact angle on different surfaces, demonstrating its versatility and precision of the results. The obtained values are in accordance with others found in the literature. The developed device presented a low-cost (US$ 25.34 per device), easy assembly and operation.
https://doi.org/10.21577/0100-4042.20170624
519 downloads
5.
SYNTHESIS, CHARACTERIZATION AND ANTIMICROBIAL ACTIVITY OF NEW Cu (II), Co (II) AND Sn (II) COMPLEXES WITH THE SODIUM HYDROTRIS(2-MERCAPTOTHIAZOLYL)BORATE LIGAND
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Ferreira, Lorena S.
; Andrade, Jéssica T.
; Lima, William G.
; Souza, Juliano de P.
; Chagas, Rafael C. R.
; Leonel, Camyla A.
; Cunha, Laís C.
; Herrera, Karina M. S.
; Braga, Alysson V.
; Soares, Luís F.
; Ferreira, Jaqueline M. S.
.
The emergence of antibiotic resistance among microbial pathogens is a serious public health problem, resulting in a constant need of discovering new antibiotics. For this purpose, we synthetized and determined the antimicrobial activity of copper (Cu), cobalt (Co), and tin (Sn) complexes coordinated with scorpionate ligand in a tridentate mode against microorganisms of clinical importance. New complexes with the sodium hydrotris(2-mercaptothiazolyl)borate ligand were characterized by physicochemical and spectroscopic techniques (UV-vis, IR, 1H and 13C NMR). Moreover, their antimicrobial activity was evaluated using microdilution broth method. Cytotoxicity was determined in Vero cells and the selectivity index (SI) was calculated. The coordination with metals increased the ligand antimicrobial activity, which showed no activity when evaluated alone (MIC>1,080 µM). Cu-complex (1) had activity against Candida albicans and C. krusei, with MICs of 130 and 66 µM, respectively. The compounds had low toxicity on Vero cells and chemo-informatics assays corroborated a low systemic toxic effect. The SI revealed that the compound 1 was 16 times more selective for C. krusei and 8 times more selective for C. albicans in relation to Vero cells. The Cu-complex stands out as a potential prototype for the development of new antifungal agents.
https://doi.org/10.21577/0100-4042.20170526
492 downloads
6.
Performance of ‘William’s’ pear grafted onto three rootstocks
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Pasa, Mateus da Silveira
; Schmitz, Juliano Dutra
; Rosa Júnior, Horacy Fagundes da
; Souza, André Luiz Külkamp de
; Malgarim, Marcelo Barbosa
; Mello-Farias, Paulo Celso de
.
ABSTRACT Pears are the most imported fruit from Brazil and thus, being an important opportunity to Brazilian growers. However, there are still some problems that restrict pear production, such as the lack of suitable rootstocks. The aim of this study was to assess growth, yield efficiency and fruit quality of ‘William’s’ pear grafted on quinces ‘Champion’ and ‘Melliforme’ and P. calleryana. The experiment was performed during 2009/2010 growing season at the Centro Agropecuário da Palma, FAEM/UFPel. The experimental design was a completely randomized block with three replications per treatment. The assessed parameters were trunk cross sectional area, shoot length, yield efficiency, number of fruit per tree, soluble solids, flesh firmness, fruit weight and fruit size. It was found that ‘William’s’ pear is more efficient and less vigorous when grafted on ‘Champion’ quince, thus being a potential scion x rootstock combination for commercial pear planting at medium densities. Moreover, fruit of trees grafted on quince rootstocks accumulated higher amount of soluble solids.
https://doi.org/10.1590/0034-737x202067020006
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7.
Temperament and performance of Nellore bulls classified for residual feed intake in a feedlot system
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GUIMARÃES, TIAGO P.
; RESTLE, JOÃO
; MOREIRA, KÍRIA KAROLLINE G.
; FREITAS NETO, MARCONDES D. DE
; SOUZA, LEONARDO FREDERICO N.
; MORAES, ÉMERSON G.
; FERNANDES, JULIANO JOSÉ R.
.
Anais da Academia Brasileira de Ciências
- Métricas do periódico
Abstract This study aimed to evaluate the performance in feedlot and temperament of Nellore bulls classified by residual feed intake. The residual feed intake was calculated as the difference between the observed and predicted dry matter intake. Bulls classified as low residual feed intake had lower dry matter intake (kg day−1) and dry matter intake (g kg−1 d−1) of body weight, and were more efficient in feed conversion ratio than those classified as medium and high. The average daily gain didn’t differ among residual feed intake classes and was 1.69 kg day−1, 1.82 kg day−1 and 1.71 kg day−1 for bulls classified as low, medium, or high, respectively. The residual feed intake was positively associated with dry matter intake, feed conversion ratio and subcutaneous fat thickness. The subcutaneous fat thickness was lower in bulls classified as low residual feed intake than in those with medium and high. No differences were observed in flight speed and reactivity score among residual feed intake classes. Overall, we concluded that bulls classified as low residual feed intake consumed less dry matter than high, with no differences in average daily gain, temperamentand had better feed efficiency, albeit their subcutaneous fat thickness was lower.
https://doi.org/10.1590/0001-3765202020190222
725 downloads
8.
Synthesis, characterization and antimicrobial activity of Cr (III), Co (II) and Ni (II) complexes with 2-thiazoline-2-tiol derivative ligands against bacteria and yeasts of clinical importance
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HERRERA, KARINA M.S.
; FERREIRA, LORENA S.
; BRAGA, ALYSSON V.
; SOUZA, JULIANO P.
; ANDRADE, JÉSSICA T.
; SOARES, ADRIANA C.
; SOARES, LUIS F.
; CHAGAS, RAFAEL C.R.
; FERREIRA, JAQUELINE M.S.
.
Anais da Academia Brasileira de Ciências
- Métricas do periódico
Abstract: Four novel Cr (III), Co (II) and Ni (II) complexes with 2-thiazoline-2-tiol derivative ligands were synthesized and characterized using elemental, physiochemical, and spectroscopy analytical methods. The results showed the formation of ligands coordinated by sulfur atoms of the C = S bond to the L1 ligand and by the sulfur atom of the C-S bond and/or nitrogen of the intra C-ring bond of the L2 ligand. The activity of the complexes against Gram-negative, Gram-positive bacteria and yeasts of clinical importance was evaluated by broth microdilution method. The best result was obtained to L2-Ni compound against E. cloacae (Minimal Inhibitory Concentration (MIC) = 62.5 µg/mL). Additionally, the compounds showed anti-Candida activity (MIC values ranging from 250 to 500 µg/mL), except the L1-Cr that was not active against any tested microorganism.
https://doi.org/10.1590/0001-376520181077
750 downloads
9.
Endophytic fungi from Myrcia guianensis at the Brazilian Amazon: distribution and bioactivity
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Banhos, Elissandro Fonseca dos
; Souza, Antonia Queiroz Lima de
; Andrade, Juliano Camurça de
; Souza, Afonso Duarte Leão de
; Koolen, Hector Henrique Ferreira
; Albuquerque, Patrícia Melchionna
.
Beneficial interactions between plants and microorganisms have been investigated under different ecological, physiological, biochemical, and genetic aspects. However, the systematic exploration of biomolecules with potential for biotechnological products from this interaction still is relatively scarce. Therefore, this study aimed the evaluation of the diversity and antimicrobial activity of the endophytic fungi obtained from roots, stems and leafs of Myrcia guianensis (Myrtaceae) from the Brazilian Amazon. 156 endophytic fungi were isolated and above 80% were identified by morphological examination as belonging to the genera Pestalotiopsis, Phomopsis, Aspergillus, Xylaria, Nectria, Penicillium and Fusarium. Fermented broth of those fungi were assayed for antimicrobial activity and four inhibited the growth of Staphylococcus aureus, Enterococcus faecalis, Candida albicans and Penicillium avellaneum. As the strain named MgRe2.2.3B (Nectria haematococca) had shown the most promising results against those pathogenic strains, its fermented broth was fractioned and only its two low polar fractions demonstrated to be active. Both fractions exhibited a minimum bactericidal concentration of 50 µg.mL-1 against S. aureus and a minimum fungicidal concentration of 100 µg.mL-1 against P. avellaneum. These results demonstrate the diversity of fungal genera in M. guianensis and the potential of these endophytic fungi for the production of new antibiotics.
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10.
Hábito de frutificação e produção de pereiras sobre diferentes porta‑enxertos
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Pasa, Mateus da Silveira
; Fachinello, José Carlos
; Schmitz, Juliano Dutra
; Souza, André Luiz Kulkamp de
; Herter, Flavio Gilberto
.
O objetivo deste trabalho foi avaliar o hábito de frutificação e produção de cultivares de pereira (Pyrus communis) enxertadas sobre porta‑enxertos de marmeleiro (Cydonia oblonga) e de pereira (P. calleryana). O experimento foi realizado durante o inverno de 2009 e 2010, em pomar de pereiras conduzido em líder central, em espaçamento 1,0x5,0 m com três cultivares de pereira (Carrick, Packham e Williams) combinadas com um porta‑enxerto de pereira (Clone D6 de P. calleryana) e 15 de marmeleiro. Foram avaliadas as seguintes variáveis: percentagem de dardos, lamburdas, brindilas vegetativas, brindilas floríferas e de bolsas; número total de gemas floríferas; produção por planta; e eficiência produtiva. O hábito de frutificação das cultivares de pereira é influenciado pelos porta‑enxertos, principalmente no que se refere à formação de lamburdas. Em geral, observou-se relação inversa entre percentagem de dardos e de lamburdas, e entre eficiência produtiva e vigor, para todas as combinações entre copa e porta‑enxerto. Para potencializar a produção, o manejo cultural nos pomares das cultivares avaliadas, principalmente por ocasião da poda, deve ser orientado de acordo com o porta‑enxerto utilizado e o hábito de frutificação de cada combinação.
The objective of this research was to evaluate the bearing habit and yield of pear cultivars (Pyrus communis) grafted onto quince (Cydonia oblonga) and callery pear (P. calleryana) rootstocks. The experiment was carried out in the winter of 2009 and 2010, in a pear orchard conducted as central leader, at 1.0x5.0 m spacing, with three pear cultivars (Carrick, Packham, and Williams) combined with one callery pear (Clone D6 of P. calleryana) and 15 quince rootstocks. The following variables were assessed: percentage of vegetative spurs, reproductive spurs, vegetative brindles, reproductive brindles and bourses; total number of flower buds; yield per plant; and productive efficiency. Bearing habit of pear cultivars is influenced by the rootstocks, mainly for reproductive spur formation. In general, there was an inverse relationship between the percentage of vegetative and reproductive spurs, and between productive efficiency and vigor for all scion and rootstock combinations. In order to enhance production, cultural management in orchards of the evaluated cultivars, especially on pruning, should be oriented according to the rootstock used and to the bearing habit of each combination.
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