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au:"Maia, Ivan G."

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Caracterização de um isolado do Sugarcane mosaic virus que quebra a resistência de variedades comerciais de cana-de-açúcar
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Gonçalves, Marcos C.

; Santos, Amaury S.

; Maia, Ivan G.

; Chagas, César M.

; Harakava, Ricardo

Fitopatologia Brasileira

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feb 2007, Volume 32 N. 1 Pages 32 - 39

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

Os vírus pertencentes ao subgrupo do Sugarcane mosaic virus (SCMV, gênero Potyvirus, família Potyviridae) infectam e causam mosaico em diferentes espécies botânicas da subfamília Panicoideae (família Poaceae), porém apenas o SCMV e o Sorghum mosaic virus (SrMV) infectam naturalmente cana-de-açúcar. No Brasil, a espécie SCMV parece ser o único agente causal da doença. Embora a maioria das variedades comerciais de cana-de-açúcar seja considerada resistente ou tolerante ao SCMV, relatos de incidência de mosaico em tais variedades têm ocorrido no campo. Amostras com sintomas, de diversos clones e variedades, foram coletadas em campos experimentais e comerciais de cana-de-açúcar. Dentre as variedades, a RB72-454, uma das mais plantadas no país e considerada resistente à doença, também apresentou plantas com sintomas de mosaico. As amostras foram testadas por DAS-ELISA, com anti-soros policlonais para as espécies SCMV, Johnsongrass mosaic virus (JGMV) e Maize dwarf mosaic virus (MDMV), apresentando resultados negativos. Porém, sintomas de mosaico foram observados em mudas de sorgo "Rio" e "TX2786" quando inoculadas mecanicamente com os isolados, indicando tratar-se de infecção pelo SCMV. RNA total foi extraído das folhas de cana e submetido a RT-PCR com oligonucleotídeos específicos para SCMV e SrMV. Fragmentos específicos de aproximadamente 880 pares de bases foram amplificados com os oligonucleotídeos para o SCMV, confirmando os resultados da inoculação mecânica. Os produtos de PCR foram clonados e seqüenciados. Um dos isolados de SCMV encontrado constitui uma nova estirpe, mais severa, capaz de infectar plantas da variedade RB72-454 e de outras variedades, consideradas tolerantes, no campo.

Viruses in the Sugarcane mosaic virus (SCMV, genus Potyvirus, family Potyviridae), subgroup cause mosaic in different botanical species in the subfamily Panicoideae (family Poaceae). However, only SCMV and Sorghum mosaic virus (SrMV) naturally infect sugarcane. In Brazil, SCMV seems to be the only causal agent of mosaic in sugarcane. Most sugarcane cultivars are believed to be resistant to mosaic, although new cases have been reported in the field. Symptomatic samples, from several clones and cultivars, were collected in sugarcane crops. Among these cultivars, RB72-454, one of the most grown in Brazil, and considered resistant, showed plants with mosaic symptoms. Samples were tested by DAS-ELISA with antisera to SCMV, Johnsongrass mosaic virus (JGMV) and Maize dwarf mosaic virus (MDMV), showing negative results. However, sorghum "Rio" and "TX2786" showed mosaic symptoms when mechanically inoculated with the viral isolates, indicating infection by SCMV. Total RNA was extracted and submitted to amplification with specific primers to SCMV and SrMV in RT-PCR. Specific bands with ca. 880 bp were amplified with the SCMV-specific primer pair, corroborating results from mechanical inoculation. PCR products were cloned and sequenced. One of the SCMV isolates comprises a new and more severe strain capable of infecting RB72-454 and other tolerant cultivars in the field.

5669 downloads

In silico evaluation of the Eucalyptus transcriptome
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Vicentini, Renato

; Sassaki, Flávio T.

; Gimenes, Marcos A.

; Maia, Ivan G.

; Menossi, Marcelo

Genetics and Molecular Biology

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2005, Volume 28 N. 3 Pages 487 - 495

Abstract: En | Text: En | PDF: En

The expressed sequence tags (ESTs) produced in the Forests project provide an invaluable opportunity to assess the Eucalyptus transcriptome. Besides providing information on the different proteins produced by this plant, it is possible to infer gene expression profiles because non-normalized cDNA libraries were used. The EST frequency from any gene is correlated to the transcript levels in the tissues from which the cDNA libraries were constructed. The goal of this work was to identify Eucalyptus genes that showed either differential expression pattern or were ubiquitously expressed in the tissues sampled in the Forests project. Six robust statistical tests and very restrictive rules were applied to gain confidence in the in silico data aiming to avoid false positives. Several genes with interesting expression profiles were identified and some of them were validated by RT-PCR.

1905 downloads Cited 1 time in SciELO

Eucalyptus ESTs involved in the production of 9-cis epoxycarotenoid dioxygenase, a regulatory enzyme of abscisic acid production
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Guerrini, Iraê A.

; Trigueiro, Rodrigo M.

; Leite, Regina M.

; Wilcken, Carlos F.

; Velini, Edivaldo D.

; Mori, Edson S.

; Furtado, Edson L.

; Marino, Celso L.

; Maia, Ivan G.

Genetics and Molecular Biology

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2005, Volume 28 N. 3 Pages 640 - 643

Abstract: En | Text: En | PDF: En

Abscisic acid (ABA) regulates stress responses in plants, and genomic tools can help us to understand the mechanisms involved in that process. FAPESP, a Brazilian research foundation, in association with four private forestry companies, has established the FORESTs database (<A HREF="https://forests.esalq.usp.br">https://forests.esalq.usp.br</A>). A search was carried out in the Eucalyptus expressed sequence tag database to find ESTs involved with 9-cis epoxycarotenoid dioxygenase (NCED), the regulatory enzyme for ABA biosynthesis, using the basic local BLAST alignment tool. We found four clusters (EGEZLV2206B11.g, EGJMWD2252H08.g, EGBFRT3107F10.g, and EGEQFB1200H10.g), which represent similar sequences of the gene that produces NCED. Data showed that the EGBFRT3107F10.g cluster was similar to the maize (Zea mays) NCED enzyme, while EGEZLV2206B11.g and EGJMWD2252H08.g clusters were similar to the avocado (Persea americana) NCED enzyme. All Eucalyptus clusters were expressed in several tissues, especially in flower buds, where ABA has a special participation during the floral development process.

2968 downloads

Diretrizes para Avaliação e Tratamento de Pacientes com Arritmias Cardíacas
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Feitosa, Gilson Soares

; Nicolau, José Carlos

; Lorga, Adalberto

; Lorga Filho, Adalberto

; D'Ávila, André

; Rassi Jr, Anis

; Paola, Angelo A. V. de

; Pedrosa, Anísio

; Costa, Álvaro Barros da

; Peres, Ayrton

; Grupi, César

; Cirenza, Cláudio

; Moreira, Dalmo

; Sobral, Dário

; Hachul, Denise

; D'Andréa, Eduardo

; Sosa, Eduardo

; God, Epotamênides M. Good

; Brito, Fábio Sândoli de

; Cruz, Fernando

; Fenelon, Guilherme

; Lima, Gustavo Glotz

; Brito, Hélio

; Maia, Ivan G.

; Atié, Jacob

; Jorge, José Carlos Moura

; Andrade, José Carlos de

; Mateos, José Carlos Pachón

; Ribeiro, José Carlos

; Pimenta, João

; Vasconcelos, José Tarcísio de

; Gizzi, Júlio

; Zimerman, Leandro

; Castilho, Luiz Antonio Teno

; Fagundes, Márcio

; Figueiredo, Márcio

; Martinelli Filho, Martino

; Scanavacca, Maurício I.

; Valente, Ney

; Medeiros, Paulo

; Brofman, Paulo

; Miranda, Reynaldo Castro

; Costa, Roberto

; Kunyioshi, Ricardo

; Sá, Roberto

; Rassi, Sérgio G.

; Siqueira, Sérgio

; Galvão, Silas

; Nishioka, Silvana

; Grillo, Tereza

; Rodrigues, Thiago da Rocha

; Maciel, Washington

Arquivos Brasileiros de Cardiologia

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2002, Volume 79 Suppl. 5 Pages 1 - 50

Abstract: Pt | Text: Pt | PDF: Pt

119261 downloads

N-glycosylation in sugarcane
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Maia, Ivan G.

; Leite, Adilson

Genetics and Molecular Biology

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dec 2001, Volume 24 N. 1-4 Pages 231 - 234

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

A N-glicosilação é uma das principais modificações pós-traducionais, sendo responsável por alterações na conformação, estabilidade e conseqüentemente na funcionalidade de proteínas em eucariotos. Com a finalidade de melhor compreender a via de N-glicosilação em plantas foi realizada uma prospecção no banco de seqüências expressas do projeto genoma da cana de açúcar (SUCEST). Foram identificadas noventa seqüências cujos produtos gênicos apresentam alto grau de similaridade com enzimas envolvidas na biossíntese e processamento de N-glicanos. Dos vinte e três genes da via de N-glicosilação previamente descritos em diferentes espécies, vinte e um foram detectados em cana de açúcar.

The N-linked glycosylation of secretory and membrane proteins is the most complex posttranslational modification known to occur in eukaryotic cells. It has been shown to play critical roles in modulating protein function. Although this important biological process has been extensively studied in mammals, much less is known about this biosynthetic pathway in plants. The enzymes involved in plant N-glycan biosynthesis and processing are still not well defined and the mechanism of their genetic regulation is almost completely unknown. In this paper we describe our first attempt to understand the N-linked glycosylation mechanism in a plant species by using the data generated by the Sugarcane Expressed Sequence Tag (SUCEST) project. The SUCEST database was mined for sugarcane gene products potentially involved in the N-glycosylation pathway. This approach has led to the identification and functional assignment of 90 expressed sequence tag (EST) clusters sharing significant sequence similarity with the enzymes involved in N-glycan biosynthesis and processing. The ESTs identified were also analyzed to establish their relative abundance.

3176 downloads

Arrhythmogenic cardiomyopathy of the right ventricle. Predictive value of QT interval dispersion to assess arrhythmogenic risk and sudden death
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Fagundes, Márcio L. A.

; Maia, Ivan G.

; Cruz Fº, Fernando E. S.

; Alves, Paulo A. G.

; Boghossian, Silvia H.

; Ribeiro, José Carlos

; Sá, Roberto

Arquivos Brasileiros de Cardiologia

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aug 2000, Volume 75 N. 2 Pages 120 - 124

Abstract: En | Text: En | PDF: En

OBJECTIVE: To determine in arrhythmogenic right ventricular cardiomyopathy the value of QT interval dispersion for identifying the induction of sustained ventricular tachycardia in the electrophysiological study or the risk of sudden cardiac death. METHODS: We assessed QT interval dispersion in the 12-lead electrocardiogram of 26 patients with arrhythmogenic right ventricular cardiomyopathy. We analyzed its association with sustained ventricular tachycardia and sudden cardiac death, and in 16 controls similar in age and sex. RESULTS: (mean ± SD). QT interval dispersion: patients = 53.8±14.1ms; control group = 35.0±10.6ms, p=0.001. Patients with induction of ventricular tachycardia: 52.5±13.8ms; without induction of ventricular tachycardia: 57.5±12.8ms, p=0.420. In a mean follow-up period of 41±11 months, five sudden cardiac deaths occurred. QT interval dispersion in this group was 62.0±17.8, and in the others it was 51.9±12.8ms, p=0.852. Using a cutoff > or = 60ms to define an increase in the degree of the QT interval dispersion, we were able to identify patients at risk of sudden cardiac death with a sensitivity of 60%, a specificity of 57%, and positive and negative predictive values of 25% and 85%, respectively. CONCLUSION: Patients with arrhythmogenic right ventricular cardiomyopathy have a significant increase in the degree of QT interval dispersion when compared with the healthy population. However it, did not identify patients with induction of ventricular tachycardia in the electrophysiological study, showing a very low predictive value for defining the risk of sudden cardiac death in the population studied.

1921 downloads

The Brugada syndrome. Outcome of one case
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Maia, Ivan G.

; Soares, Magda Wanderley

; Boghossian, Silvia H.

; Sá, Roberto

Arquivos Brasileiros de Cardiologia

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may 2000, Volume 74 N. 5 Pages 442 - 445

Abstract: En | Text: En | PDF: En

The Brugada syndrome is a rare condition, and due to its mutating manner of presentation it may be difficult to diagnose. We report one case and discuss the diagnostic aspects and the clinical outcome of one patient with characteristic findings of this syndrome. These findings are especially defined by J-ST elevation in the right leads of serial electrocardiographic records, wide oscillations of J points and ST segments during 24-hour Holter monitoring, and nocturnal sudden death. We stress the importance of the Holter monitor findings for diagnostic complementation. Through this method it is possible to establish a correlation between vigil activities and sleep and the variability of the degree of impairment in ventricular repolarization.

3026 downloads

Contribuição de eletrocardiografia dinâmica pelo sistema Holter na avaliação de pacientes com a síndrome congênita do QT longo
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Maia, Ivan G.

; Fagundes, Marcio L. A.

; Cruz Fº, Fernando E. S.

; Barbosa, Rosa Célia P.

; Alves, Paulo A. G.

Arquivos Brasileiros de Cardiologia

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jul 1998, Volume 71 N. 1 Pages 49 - 54

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

OBJETIVO: Avaliar pelo Holter-24h a dinâmica da repolarização ventricular de pacientes com a síndrome congênita do QT longo. MÉTODOS: Foram incluídos seis pacientes, sendo os resultados confrontados com os observados em um grupo controle semelhante em número, idade e sexo. Analisaram-se nas gravações a morfologia da onda T e sua dinâmica, o intervalo QTc médio para as 24h, as relações entre QT e ciclo cardíaco, a variabilidade do QTc das 24h, bem como a sua dispersão (diferença entre o maior e menor QTc observado). Todas as variáveis foram definidas a partir da medida do intervalo QT obtida no 1º minuto de cada hora da gravação. RESULTADOS: Alterações morfológicas da onda T estiveram presentes em todos os pacientes, observando-se em cinco deles freqüentes episódios de alternância da onda T, achados ausentes no controle. QTc médio para as 24h - controle: 436,1±8,9ms; pacientes: 598,2±73,8ms (p=0,000). Correlação linear entre QT e ciclo cardíaco - controle: r= 0,967; pacientes: r= 0,812 (p=0,000). Variabilidade do QTc para as 24h - controle: 14,7±2,1ms; pacientes: 36,9±17,2ms (p=0,01). Dispersão do QTc - controle: 53,3±8,1ms; pacientes: 168,3±70,2ms (p=0,000). CONCLUSÃO: Os resultados apresentaram ampla variabilidade dos intervalos QTc nas 24h, menor adaptabilidade do intervalo QT às flutuações dos ciclos cardíacos e significativa dispersão da repolarização ventricular nas 24h, confirmando mais uma vez a existência de importante alteração da vulnerabilidade ventricular nesses pacientes.

PURPOSE: The purpose of this study was to evaluate the value of ambulatory electrocardiogram as a clinical tool to assess ventricular repolarization in patients with the congenital long QT syndrome. METHODS: The study population comprised six patients and their data were compared to a control group of six patients matched in age and gender. The QT interval (ms), corrected by the heart rate, was measured in the first minute of each hour using two monitoring leads, with the mean of six consecutives complexes. The data obtained include the morphologic pattern of T wave, the mean 24-h QTc interval, relation between QT and cardiac cycle, QTc variability (assessed calculating hourly standard deviation of the interval and then obtaining the global 24-h mean), QTc dispersion (difference between the longest and shortest QTc interval). RESULTS: In all patients abnormal patterns of T waves were detected with frequent episodes of T wave alternans. Mean 24-h QTc - patients: 598.2±73.8ms; controls: 436.1±8.9ms (p=0.000). Linear correlation and regression between QT and heart rate - patients: r= 0.812; controls: r= 0.967 (p=0.000). QTc variability - patients: 36.9±17.2ms; controls: 14.7±2.1ms (p=0.01). QTc dispersion - patients: 168.3±70.2ms; controls: 53.3±8.1ms (p=0.000). CONCLUSION: The data showed increased hourly QTc variability, QTc dispersion and worse correlation between QT and heart rate. This data may reflect an abnormally augmented ventricular vulnerability.

2721 downloads

Avaliação do perfil arritmogênico ventricular de pacientes com miocardiopatia dilatada e fração de ejeção diminuída
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Maia, Ivan G.

; Drumond Neto, Cantidio

; Montera, Marcelo

; Costa, Lilian Soares da

; Alves, Paulo A. G.

Arquivos Brasileiros de Cardiologia

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apr 1998, Volume 70 N. 4 Pages 237 - 241

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

OBJETIVO: Avaliar o perfil arritmogênico ventricular de pacientes com miocardiopatia dilatada e fração de ejeção diminuída. MÉTODOS: Estudo prospectivo em 40 pacientes com fração de ejeção média ao ecocardiograma de 32,5±2,1%, obtida pela análise do Holter de 24h, do balanço autonômico cardíaco, determinado por índices de variabilidade da freqüência cardíaca (rMSSD e pNN50), do eletrocardiograma (ECG) de alta resolução (ECGAR) e do grau de dispersão da repolarização ventricular determinado no ECG de superfície. Por regressão logística determinaram-se, a partir dos resultados, os preditores de risco para morte cardíaca e morte súbita. RESULTADOS: Observou-se na população envolvida uma elevada incidência de ectopias ventriculares isoladas, pareadas e de surtos não sustentados de taquicardia ventricular. Pela análise do balanço autonômico notou-se depressão da atividade vagal cardíaca em mais da metade dos pacientes, sendo que apenas 30% apresentaram ECGAR positivo. O grau de dispersão temporal da repolarização ventricular variou de 20 a 100ms. A presença de >30 extra-sístoles isoladas por hora e de taquicardia ventricular não sustentada ao Holter foram os preditores de risco com valores mais elevados para a morte cardíaca e morte súbita, com uma razão de risco respectiva de 1,9 e 3,2 (p= 0,01 e 0,000). CONCLUSÃO: Foram observadas importantes alterações no comportamento elétrico e autonômico cardíaco, constituindo-se fatores de risco para a ocorrência de eventos arrítmicos graves ou fatais.

PURPOSE: To evaluate the arrhythmogenic profile of patients with dilated cardiomyopathy of low ejection fraction and its prognostic significance. METHODS: Data from 40 patients (30 males; mean age: 52±13 years) were analysed including ventricular arrhythmias (24h - Holter monitoring), autonomic balance from heart rate variability in time domain (rMSSD and pNN50 indexes), ventricular late potentials (signal averaged electrocardiogram (ECG)) and dispersion of ventricular repolarization measured from 12-lead ECG. RESULTS: There was a high prevalence of ventricular arrhythmias with at least one episode of nonsustained ventricular tachycardia (VT) in 60% of the patients. Depressed vagal activity was observed in more than half of the patients. In only 30% of the patients the signal-averaged ECG was positive. The dispersion of ventricular repolarization ranged from 20 to 100ms. The presence of >30 ventricular premature beats or nonsustained VT on Holter monitoring was the most significant predictor of cardiac death and sudden cardiac death with a relative risk of 1.9 and 3.2, respectively (p= 0.01 and 0.000). CONCLUSION: In this study population it was noted that patients with dilated cardiomyopathy and low ejection fraction had an abnormal electrical and autonomic cardiac behaviour. These findings could represent risk factors for the ocurrence of life-threatening arrhythmias or fatal events.

3484 downloads

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Modificação do nódulo sinusal via cateter por energia de radiofreqüência em paciente com taquicardia sinusal inapropriada. Avaliação dos resultados imediatos e tardios
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Cruz Fº, Fernando E. S.

; Maia, Ivan G.

; Fagundes, Marcio L. A.

; Boghossian, Silvia

; Ribeiro, José Carlos

Arquivos Brasileiros de Cardiologia

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mar 1998, Volume 70 N. 3 Pages 173 - 176

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

São apresentados os resultados imediatos e tardios, observados com a modificação do nódulo sinusal via cateter, usando-se energia de radiofreqüência, em portadora de taquicardia sinusal inapropriada. O procedimento normalizou os níveis de freqüência cardíaca nas 24h seguintes e após seis meses, mostrando-se, portanto, efetivo e seguro. Apesar da redução da freqüência cardíaca a níveis normais, houve manutenção dos sintomas apresentados pela paciente, sugerindo que não são decorridos, exclusivamente, do processo taquicárdico.

This article reports the early and late results of a patient in whom radiofrequency current was used to ablate an incessant inappropriate sinus tachycardia. During successful radiofrequency application there was a sudden change of rate and subsequent emergence of a stable rhythm with the same sinus node P wave characteristics. During follow-up, normal cardiac cycles were still present after six months of the procedure, although the patient still complained of palpitations, suggesting no correlation with the heart rate.

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