Consulta: subjectFacets:"Resistance"
Registros recuperados: 255
Data/hora: 10/06/2024 06:58:31

Calidad postcosecha del brócoli e histopatología de la respuesta varietal al mildiu Hyaloperonospora parasitica
Provedor de dados: 32
Autores: Fraire Cordero, Ma. de Lourdes.
La calidad postcosecha de Brócoli está asociada con la buena sanidad de los floretes. En los  últimos años, la ‘pudrición de florete’ ha causado pérdidas por afectar la calidad; sin embargo,  a pesar de algunos estudios, los agentes causales no han sido completamente identificados.  Durante el 2005 y 2006 se colectaron floretes con síntomas de pudrición, de los cuales se aisló  e identificó, morfológica y molecularmente, a Alternaria tenuissima, A. alternata y Fusarium  oxysporum. Las pruebas de patogenicidad confirmaron a esos hongos como los causantes de la  enfermedad. En un trabajo posterior, se observó que A. tenuissima penetró a través de los  estomas de los sépalos, entre las 16 y 18 h después de que el conidio fue depositado en la  superficie. Y la...
Tipo: Tesis
Palavras-chave: Brassica oleracea var. italica; Resistencia; Peronospora parasitica; Doctorado; Fitopatologia; Resistance.
Ano: 2008
URL: http://hdl.handle.net/10521/1335

Inductores de resistencia a TuMV en Arabidopsis thaliana (L). Heynh.
Provedor de dados: 32
Autores: Salgado Siclán, Martha Lidya.
Las respuestas de la planta contra patógenos implican grandes cambios en la expresión de los mecanismos de defensa. Una de las primeras manifestaciones es la reacción de hipersensibilidad (HR) que deriva en  muerte celular localizada en el lugar de la infección dando lugar a lesiones necróticas, a nivel celular se observa la producción de especies reactivas de oxígeno, fuga de electrolitros, peroxidación de lípidos, refuerzo de pared celular y presencia de fitoalexinas. La rápida activación transcripcional de genes relacionados con patogénesis (genes PR) se ve relacionada con la activación de la respuesta sistémica adquirida (SAR). Dicha resistencia actúa en toda la planta y es alimentada por rutas de señalización que sensibilizan a la planta contra una...
Palavras-chave: SAR; THA1; TuMV; Inductores; Resistencia; Inductors; Resistance; Fitopatología; Doctorado; TGA1; MPK1; PR1.
Ano: 2012
URL: http://hdl.handle.net/10521/754

El frente de pueblos en defensa de la tierra (FPDT) y la violencia de género.
Provedor de dados: 32
Autores: Carrillo Franco, Blanca Estela.
En esta investigación se muestra que el Estado ante la crisis hegemónica por la que atraviesa criminaliza a los movimientos sociales que disienten del “orden establecido”. Es el caso del Frente de Pueblos en Defensa de la Tierra (FPDT). El Estado mexicano ha optado por reprimirlo y judicializarlo. La represión estatal a dicho movimiento es añeja, desde que surgió ante la inminente expropiación de sus tierras, el 22 de octubre de 2001, las personas del FPDT han vivido la violencia del brazo represor del Estado. La violencia más cruenta fue la de los días de mayo de 2006 debido a que hubo innumerables violaciones a los Derechos Fundamentales. En esta fueron detenidas 217 personas, 47 mujeres, de las cuales 27 denunciaron violación sexual y tortura...
Palavras-chave: Movimiento social; Criminalización de la disidencia; Violencia de género; Violación sexual; Tortura sexualizada; Participación; Resistencia; Social movement; Dissidence criminalization; Gender violence; Sexual violation; Sexualized torture; Participation; Resistance; Maestría; CEDERU.
Ano: 2010
URL: http://hdl.handle.net/10521/66

Susceptibilidad de cuatro poblaciones de Aedes aegypti (Diptera: Culicidae) a insecticidas.
Provedor de dados: 32
Autores: Rojas Rosas, Vianney.
Aedes aegypti (Diptera: Culicidae), es el vector más importante en la transmisión de fiebre amarilla, fiebre de chikungunya y dengue, que ocasionan graves problemas a humanos, por lo que es importante para su manejo, la participación de la comunidad en la eliminación de criaderos y la intervención de dependencias relacionadas con la salud pública para aplicar el control químico. En el presente estudio se determinaron los niveles de resistencia a insecticidas en larvas y adultos de A. aegypti de tres poblaciones, comparándolas con una susceptible. Se evaluaron tres insecticidas organofosforados, dos piretroides, una piretrina y una avermectina. Temefos mostró valores menores de 10X en las poblaciones de campo, lo cual indica que son susceptibles a este...
Palavras-chave: Aedes; Control de mosquitos; Resistencia; Mosquito control; Resistance; Maestría; Entomología y Acarología.
Ano: 2011
URL: http://hdl.handle.net/10521/523

Resistencia de clones de papa al tizón tardío (Phytophthora infestans) y su caracterización morfológica en el Valle de Toluca.
Provedor de dados: 32
Autores: Rivadeneira Ruales, Jorge Esteban.
El rendimiento, la resistencia a enfermedades y la calidad del tubérculo son las características más importantes en el mejoramiento genético de la papa (Solanum tuberosum); por ello, el objetivo de la presente investigación fue estudiar los componentes de varianza y heredabilidad en sentido estrecho (h2) de la respuesta a Phytophthora infestans, así como la caracterización morfológica de clones resistentes, así como seleccionar los clones con resistencia y buenas características agronómicas. Se evaluaron 198 clones en primera generación clonal de 20 cruzas, y 13 de los 20 progenitores en el campo experimental del Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias (INIFAP), en el valle de Toluca, Estado de México. Más del 30% de clones...
Palavras-chave: Solanum tuberosum; Phytophthora infestans; Resistencia; Tizón tardío; Heredabilidad; Diversidad genética; Clones; Cruzas; Progenitor; Resistance; Late blight; Heritability; Genetic diversity; Clones; Crosses; Parent; Maestría; Genética.
Ano: 2011
URL: http://hdl.handle.net/10521/505

Aislamiento e identificación de bacterias ácido lácticas con potencial probiótico en bovinos Holstein.
Provedor de dados: 32
Autores: Caballero Cervantes, Yesenia.
El principal problema de salud en becerras de reemplazo son las diarreas provocadas por Escherichia coli enterotóxica. El uso de microorganismos pertenecientes al grupo de bacterias ácido lácticas (BAL) en la etapa de lactancia es benéfico para combatir la incidencia de diarreas e incrementar la ganancia de peso. Sin embargo, se ha reportado inconsistencia en los efectos benéficos de los productos comerciales. Por lo anterior, el objetivo de este estudio fue aislar y seleccionar BAL con potencial probiótico de mucosa oral de becerros lactantes, calostro y leche de vacas Holstein que puedan ser consideradas para el suministro de becerras en México. Para ello, se realizó el aislamiento en caldo Man Rogosa Sharp (MRS) y en agar MRS para la obtención de...
Palavras-chave: Becerras; Lactobacillus; Cepas; Resistencia; Heifers; Strains; Resistance; Ganadería; Maestría.
Ano: 2014
URL: http://hdl.handle.net/10521/2358

Respuesta de 41 variedades prometedoras de caña de azúcar a la enfermedad de la escaldadura de la hoja (Xanthomonas albilineans).
Provedor de dados: 32
Autores: López Vázquez, José de Jesús.
La escaldadura de la hoja (Xanthomonas albilineans), es una de las enfermedades bacterianas de mayor importancia en el cultivo de caña de azúcar. Afecta la calidad del jugo y en variedades susceptibles ocasiona pérdidas estimadas entre el 90 y 100%. Con el objetivo fue caracterizar molecularmente el agente causal, evaluar el método apropiado de inoculación y evaluar la respuesta de 41 variedades de caña de azúcar a la escaldadura de la hoja. Las variedades fueron inoculadas en campo por tres métodos: transmisión mecánica, inyección y decapitado; a los 120 días después de la siembra. Se empleó una suspensión bacteriana de 9X10-8 ufc/ml-1.  Para identificar molecular se utilizó PCR con los primers 8F y 1492R. Para determinar el método apropiado de...
Palavras-chave: Escaldadura; Incidencia; Severidad; Resistencia; Susceptibilidad; Scald; Incidence; Severity; Resistance; Susceptibility; Maestría; Producción Agroalimentaria en el Trópico.
Ano: 2013
URL: http://hdl.handle.net/10521/2045

Estrategias para el control de Phytophthora capsici Leo. y Fusarium solani Mart. en el cultivo del chile (Capsicum annuum L.).
Provedor de dados: 32
Autores: Santos Juárez, Pedro.
Phytophthora capsici, Fusarium sp. y Rhizoctonia solani son los principales agentes causales de la marchitez del chile que disminuye el rendimiento del cultivo, lo cual ha originado la sustitución de cultivos y abandono de tierras. Con el fin de coadyuvar al manejo de esta enfermedad en el presente trabajo se evaluaron 51 accesiones de chile (árbol, copi y soledad) para buscar fuentes de resistencia; se probó metalaxyl, fosetil aluminio y tiabendazol para evaluar la sensibilidad de un aislamiento de P. capsici y se evaluó el Serrano Criollo de Morelos 334 (SCM334) resistente a P. capsici como portainjerto de las variedades susceptibles para el manejo de la marchitez del chile. El análisis de los resultados muestra que P. capsici tiene una sensibilidad...
Palavras-chave: Fusarium sp.; Resistencia; Injerto; Capsicum annuum L.; Fusarium sp.; Resistance; Maestría; Fitopatología.
Ano: 2010
URL: http://hdl.handle.net/10521/159

Estrategias para el control de Phytophthora capsici Leo. y Fusarium solani Mart. en el cultivo del chile (Capsicum annuum L.).
Provedor de dados: 32
Autores: Santos Juárez, Pedro.
Phytophthora capsici, Fusarium sp. y Rhizoctonia solani son los principales agentes causales de la marchitez del chile que disminuye el rendimiento del cultivo, lo cual ha originado la sustitución de cultivos y abandono de tierras. Con el fin de coadyuvar al manejo de esta enfermedad en el presente trabajo se evaluaron 51 accesiones de chile (árbol, copi y soledad) para buscar fuentes de resistencia; se probó metalaxyl, fosetil aluminio y tiabendazol para evaluar la sensibilidad de un aislamiento de P. capsici y se evaluó el Serrano Criollo de Morelos 334 (SCM334) resistente a P. capsici como portainjerto de las variedades susceptibles para el manejo de la marchitez del chile. El análisis de los resultados muestra que P. capsici tiene una sensibilidad...
Palavras-chave: Fusarium sp.; Resistencia; Injerto; Capsicum annuum L.; Fusarium sp.; Resistance; Maestría; Fitopatología.
Ano: 2010
URL: http://hdl.handle.net/10521/159

El frente de pueblos en defensa de la tierra (FPDT) y la violencia de género.
Provedor de dados: 32
Autores: Carrillo Franco, Blanca Estela.
En esta investigación se muestra que el Estado ante la crisis hegemónica por la que atraviesa criminaliza a los movimientos sociales que disienten del “orden establecido”. Es el caso del Frente de Pueblos en Defensa de la Tierra (FPDT). El Estado mexicano ha optado por reprimirlo y judicializarlo. La represión estatal a dicho movimiento es añeja, desde que surgió ante la inminente expropiación de sus tierras, el 22 de octubre de 2001, las personas del FPDT han vivido la violencia del brazo represor del Estado. La violencia más cruenta fue la de los días de mayo de 2006 debido a que hubo innumerables violaciones a los Derechos Fundamentales. En esta fueron detenidas 217 personas, 47 mujeres, de las cuales 27 denunciaron violación sexual y tortura...
Palavras-chave: Movimiento social; Criminalización de la disidencia; Violencia de género; Violación sexual; Tortura sexualizada; Participación; Resistencia; Social movement; Dissidence criminalization; Gender violence; Sexual violation; Sexualized torture; Participation; Resistance; Maestría; CEDERU.
Ano: 2010
URL: http://hdl.handle.net/10521/66

Uso de injertos y contenido de fenoles solubles totales en genotipos de jitomate (Lycopersicon esculentum Mill.) resistentes y susceptibles a Fusarium oxysporum f. sp. lycopersici raza 3.
Provedor de dados: 32
Autores: Gómez Zavala, Luis Alberto.
En jitomate (Lycopersicon esculentum Mill.) germoplasmas no comerciales resistentes son usados como portainjertos para el control de enfermedades. Los compuestos fenólicos están asociados a genotipos resistentes contra especies de Fusarium. Altos contenidos de fenoles solubles totales puede estar asociado a genotipos resistentes a Fusarium oxysporum f. sp. lycopersici raza 3. En el presente estudio se comparo el porcentaje de severidad en plantas injertadas y no injertadas inoculadas con Fol-3, así como el contenido de fenoles solubles totales en plantas de jitomate Multifort resistente y Bizarr, Jazmín y Malinche susceptibles a este hongo. Plantas de los genotipos susceptibles injertadas sobre Multifort fueron inoculadas o no en una suspensión de 1x106/ml...
Palavras-chave: Injertos; Compuestos fenólicos; Fusarium oxysporum f. sp. lycopersici raza 3; Resistencia; Graft; Phenols; Resistance; Maestría; Fitopatología.
Ano: 2010
URL: http://hdl.handle.net/10521/230

Uso de injertos y contenido de fenoles solubles totales en genotipos de jitomate (Lycopersicon esculentum Mill.) resistentes y susceptibles a Fusarium oxysporum f. sp. lycopersici raza 3.
Provedor de dados: 32
Autores: Gómez Zavala, Luis Alberto.
En jitomate (Lycopersicon esculentum Mill.) germoplasmas no comerciales resistentes son usados como portainjertos para el control de enfermedades. Los compuestos fenólicos están asociados a genotipos resistentes contra especies de Fusarium. Altos contenidos de fenoles solubles totales puede estar asociado a genotipos resistentes a Fusarium oxysporum f. sp. lycopersici raza 3. En el presente estudio se comparo el porcentaje de severidad en plantas injertadas y no injertadas inoculadas con Fol-3, así como el contenido de fenoles solubles totales en plantas de jitomate Multifort resistente y Bizarr, Jazmín y Malinche susceptibles a este hongo. Plantas de los genotipos susceptibles injertadas sobre Multifort fueron inoculadas o no en una suspensión de 1x106/ml...
Palavras-chave: Injertos; Compuestos fenólicos; Fusarium oxysporum f. sp. lycopersici raza 3; Resistencia; Graft; Phenols; Resistance; Maestría; Fitopatología.
Ano: 2010
URL: http://hdl.handle.net/10521/230

Calidad postcosecha del brócoli e histopatología de la respuesta varietal al mildiu Hyaloperonospora parasitica
Provedor de dados: 32
Autores: Fraire Cordero, María de Lourdes.
La calidad postcosecha de Brócoli está asociada con la buena sanidad de los floretes. En los  últimos años, la ‘pudrición de florete’ ha causado pérdidas por afectar la calidad; sin embargo,  a pesar de algunos estudios, los agentes causales no han sido completamente identificados.  Durante el 2005 y 2006 se colectaron floretes con síntomas de pudrición, de los cuales se aisló  e identificó, morfológica y molecularmente, a Alternaria tenuissima, A. alternata y Fusarium  oxysporum. Las pruebas de patogenicidad confirmaron a esos hongos como los causantes de la  enfermedad. En un trabajo posterior, se observó que A. tenuissima penetró a través de los  estomas de los sépalos, entre las 16 y 18 h después de que el conidio fue depositado en la  superficie. Y la...
Tipo: Tesis
Palavras-chave: Brassica oleracea var. italica; Resistencia; Peronospora parasitica Brassica oleracea var. italica; Resistance; Peronospora parasitica.
Ano: 2012
URL: http://hdl.handle.net/10521/1042

Susceptibilidad de cuatro poblaciones de Aedes aegypti (Diptera: Culicidae) a insecticidas.
Provedor de dados: 32
Autores: Rojas Rosas, Vianney.
Aedes aegypti (Diptera: Culicidae), es el vector más importante en la transmisión de fiebre amarilla, fiebre de chikungunya y dengue, que ocasionan graves problemas a humanos, por lo que es importante para su manejo, la participación de la comunidad en la eliminación de criaderos y la intervención de dependencias relacionadas con la salud pública para aplicar el control químico. En el presente estudio se determinaron los niveles de resistencia a insecticidas en larvas y adultos de A. aegypti de tres poblaciones, comparándolas con una susceptible. Se evaluaron tres insecticidas organofosforados, dos piretroides, una piretrina y una avermectina. Temefos mostró valores menores de 10X en las poblaciones de campo, lo cual indica que son susceptibles a este...
Palavras-chave: Aedes; Control de mosquitos; Resistencia; Mosquito control; Resistance; Maestría; Entomología y Acarología.
Ano: 2011
URL: http://hdl.handle.net/10521/523

Resistencia de clones de papa al tizón tardío (Phytophthora infestans) y su caracterización morfológica en el Valle de Toluca.
Provedor de dados: 32
Autores: Rivadeneira Ruales, Jorge Esteban.
El rendimiento, la resistencia a enfermedades y la calidad del tubérculo son las características más importantes en el mejoramiento genético de la papa (Solanum tuberosum); por ello, el objetivo de la presente investigación fue estudiar los componentes de varianza y heredabilidad en sentido estrecho (h2) de la respuesta a Phytophthora infestans, así como la caracterización morfológica de clones resistentes, así como seleccionar los clones con resistencia y buenas características agronómicas. Se evaluaron 198 clones en primera generación clonal de 20 cruzas, y 13 de los 20 progenitores en el campo experimental del Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias (INIFAP), en el valle de Toluca, Estado de México. Más del 30% de clones...
Palavras-chave: Solanum tuberosum; Phytophthora infestans; Resistencia; Tizón tardío; Heredabilidad; Diversidad genética; Clones; Cruzas; Progenitor; Resistance; Late blight; Heritability; Genetic diversity; Clones; Crosses; Parent; Maestría; Genética.
Ano: 2011
URL: http://hdl.handle.net/10521/505

The Mathematical Biology of Human Infections
Provedor de dados: 7
Autores: Nowak, Martin A; Institute for Advanced Study; nowak@ias.edu.
Humans are constant victims of infectious diseases. Biomedical research during this century has led to important insights into the molecular details of immune defense. Yet, many questions relating to disease require a quantitative understanding of the complex systems that arise from the nonlinear interactions between populations of immune cells and infectious agents. Exploration of such questions has lead to a newly emerging field of mathematical biology describing the spread of infectious agents both within and between infected individuals. This essay will discuss simple and complex models of evolution, and the propagation of virus and prion infections. Such models provide new perspectives for our understanding of infectious disease and provide guidelines...
Tipo: Peer-Reviewed Reports
Palavras-chave: CTL response; HIV; Antivirals; Epidemiology; Immune response; Infectious diseases; Mathematical biology; Models of evolution; Prions; Resistance; Treatment; Viruses.
Ano: 1999

Not All Roads Lead to Resilience: a Complex Systems Approach to the Comparative Analysis of Tortoises in Arid Ecosystems
Provedor de dados: 7
Autores: Leuteritz, Thomas E. J.; Redlands Institute; thomas_leuteritz@redlands.edu; Ekbia, Hamid R.; Redlands Institute;.
The concept of resilience has been widely used in the study of social-ecological systems, with its key components identified as resistance, latitude, and precariousness. We use this concept to examine the differences among three semi-arid regions in terms of these three components. We do this by examining the status of tortoises that occur in the dry spiny forest Madagascar, the Karoo of South Africa, and the Mojave Desert of the United States as an indicator of the health and resilience of their respective ecosystems. Our findings demonstrate the tight coupling between societal development and ecosystem dynamics, the role of diversity in enhancing resilience, and the significance of local communal knowledge in sustaining it. Our findings also suggest that...
Tipo: Peer-Reviewed Synthesis
Palavras-chave: Collective variable; Control parameter; Latitude; Madagascar; Panarchy; Precariousness; Resistance; Social-ecological systems; South Africa; United States.
Ano: 2008

Identification of SSR and RAPD markers linked to a resistance allele for angular leaf spot in the common bean (Phaseolus vulgaris) line ESAL 550
Provedor de dados: 74
Autores: Silva,Gilvan Ferreira da; Santos,João Bosco dos; Ramalho,Magno Antonio Patto.
The objective of this study was to identify RAPD and SSR markers associated with a resistant allele for angular leaf spot (Phaeoisariopsis griseola) from the line 'ESAL 550', derived from the Andean 'Jalo EEP 558' cultivar, to assist selection of resistant genotypes. The resistant line 'ESAL 550' and the susceptible cultivar 'Carioca MG' were crossed to generate F1 and F2 populations. One hundred and twenty F2:3 families were evaluated. The DNA of the 12 most resistant families was bulked and the same was done with the DNA of the 10 most susceptible, generating two contrasting bulks. One RAPD and one SSR marker was found to be linked in coupling phase to the resistant allele. The SSR marker was amplified by the primer PV-atct001(282C), and its distance...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Phaeoisariopsis griseola; DNA markers; Resistance; Bulk segregant analysis.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000400009

Genetic basis of the resistance to Strongyloides venezuelensis (Nematoda, Rhabdiasidae) infection in mice (Mus musculus)
Provedor de dados: 74
Autores: Marra,Nelson Mendes; Amarante,Alessandro F.T.; Amarante,Mônica R.V.
We investigated the resistance to Strongyloides venezuelensis primary infection of mice strains NIH (resistant) and C57BL/6 (susceptible) and the F1 and F2 offspring of crosses between these strains. The mice were infected with 2000 larvae and seven days later were sacrificed for parasite recovery and counting. There was no statistically significant (p &gt; 0.05) sex effect on resistance. The F1 mice showed an intermediate mean number of parasites as compared to the parental NIH and C57BL6 strains. Out of 400 F2 mice, the 10% most resistant mice were infected with 21 to 97 parasites, while the 10% most susceptible mice were infected with 1027 to 1433 parasites. We also found that F2 mice with black fur (n = 72), the same color as the C57BL/6 susceptible...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mice; Strongyloides venezuelensis; Resistance; Genetics.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000100012

Genetic analysis of soybean resistance to Fusarium solani f.sp. glycines
Provedor de dados: 74
Autores: Fronza,Vanoli; Vello,Natal Antonio; Camargo,Luis Eduardo Aranha.
In order to study the genetic control of soybean resistance to sudden death syndrome (SDS), a 5 x 5 diallel with the F2 generation, without the reciprocals, was carried out in a greenhouse. The following parents were used: Forrest, MG/BR-46 (Conquista), IAC-4, FT-Cristalina, and FT-Estrela. The first two cultivars are more resistant to SDS than IAC-4, which is considered to be moderately resistant to SDS, and the last two cultivars are highly susceptible. The fungus was inoculated with three colonized sorghum grains placed at the bottom of the holes with two soybean seeds. Single plants were evaluated between 14 and 37 days after emergency based on foliar severity symptoms (1-5) of SDS. The disease incidence and a disease index were also calculated for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Resistance; Sudden death syndrome-SDS; Diallel crosses; Jinks-Hayman; Molecular markers SSR.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000300016

Esterase profile in a pyrethroid-resistant Brazilian strain of the cattle tick Boophilus microplus (Acari, Ixodidae)
Provedor de dados: 74
Autores: Baffi,Milla Alves; Pereira,Cícero Donizete; Souza,Guilherme Rocha Lino de; Bonetti,Ana Maria; Ceron,Carlos Roberto; Gourlart,Luiz Ricardo.
The cattle tick Boophilus microplus causes great damage in livestock and is considered one of the most important tropical ectoparasites. The traditional method of control is based on the intensive use of pesticides, however the indiscriminate use of these compounds over the years has led to the selection of resistant ticks. Hydrolases, particularly esterases (EST), have been reported to be associated with acaricide resistance in B. microplus. We compared the esterase profile of susceptible and cypermethrin-resistant strains of adult B. microplus and a pyrethroid susceptible reference strain (the Mozzo strain) using polyacrylamide gel electrophoresis and specific staining. The electrophoretic profiles of protein extracts revealed the presence of four...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Boophilus microplus; Pesticides; Resistance; Esterases.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000500016

BRS Juruti: the first Brazilian habanero-type hot pepper cultivar
Provedor de dados: 75
Autores: Ribeiro,Claudia SC; Souza,Karina RR; Carvalho,Sabrina IC; Reifschneider,Francisco JB.
ABSTRACT: The Habanero hot pepper group is not well known in Brazil, despite its origin in the Amazon. Nevertheless, domestic and international markets have been increasing the demand for this type of hot pepper. The Brazilian agroindustry is interested in supplying part of this demand with high quality products and competitive prices, and it needs well-adapted cultivars. To fill this gap, Embrapa Vegetables developed the Habanero pepper cultivar BRS Juruti, which meets the demands of both the market for fresh fruit and the processing agroindustry of mash and sauces. Cultivar BRS Juruti has red fruits and yielded around 50 t/ha (36,000 plants/ha). Fruit pungency is circa 260,000 SHU and fruits have high content of vitamin C (122 mg/100 g). BRS Juruti is...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capsicum chinense; Breeding; Resistance; Processing; Capsaicin.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362015000400527

Reaction of vegetables and aromatic plants to Meloidogyne javanica and M. incognita
Provedor de dados: 75
Autores: Dias-Arieira,Cláudia Regina; Cunha,Tatiana PL da; Chiamolera,Fernando Marcelo; Puerari,Heriksen H; Biela,Fabio; Santana,Simone de M.
For this research we used 15 day-old seedlings which were transplanted to 2 L pots and inoculated with 4,000 nematode eggs plus juveniles (J2). After 60 days, the root systems were removed and the number of galls and eggs evaluated and used to calculate the nematode reproduction factor (RF). The tomato cv. Santa Cruz was used as a susceptible control. The experimental design was completely randomized, with six replications. Averages were compared using the Tukey or Scott-Knott test at 5%. For lettuce, Salad Bowl (Mimosa type), Elizabeth and Elisa (Lisa) and Vera cultivars (crisphead), the number of galls and the RF for M. javanica were statistically higher than for the control, whereas, for the other vegetable crops, the highest number of galls and eggs...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Vegetables; Susceptibility; Resistance; Root-knot nematodes.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362012000200023

Fruit yield and bacterial wilt symptoms on eggplant genotypes grown in soil infested with Ralstonia solanacearum
Provedor de dados: 75
Autores: Oliveira,Ivani T; Lopes,Carlos A; Moura,Andrea B.
Fruit yield and bacterial wilt symptoms of eggplant genotypes CNPH006, CNPH171, CNPH658, CNPH778, CNPH783, and CNPH785 were quantified in soil naturally infested with Ralstonia solanacearum(race 1, biovar 3) in Brasília, Brazil.Exceptfor CNPH778, all genotypes developed at least one typical wiltedplant. Besides wilt,other symptoms considered for assessing levels of tolerance/resistance among genotypes wereplant death (CNPH006, CNPH171, CNPH658 and CNPH783), leaf chlorosis(CNPH785) and plant dwarfing (all genotypes). The occurrence of bacterial ooze on cut stems was observed in all plants grown in infested beds, including those that did not exhibit wilt symptoms. Plants grown simultaneouslyin noninfested beds of the same dimensions and soil characteristics...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum melongena; Resistance; Losses.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362014000400453

Reaction of families and lines of melon to powdery mildew
Provedor de dados: 75
Autores: Sales Júnior,Rui; Nunes,Glauber HS; Michereff,Sami J; Pereira,Elaíne WL; Guimarães,Izabel M.
Powdery mildew, caused by Podosphaera xanthii, is an important disease of melon in the Brazilian Northeast. The objective of this work was to evaluate the reaction of families, lines and cultivars of melon to P. xanthii. Two experiments in simple lattice were carried out under field conditions in the municipalities of Mossoró and Baraúna to evaluate 144 families. In a greenhouse, an experiment was carried out in a completely randomized design to evaluate 19 lines and the cultivars Yellow Queen, Chilton and Hy Mark. Disease was assessed by a severity scale. There was genetic variability among families. The families 4, 5, 11, 14, 18, 23, 33, 42, 101, 112 and 140 were identified in both sites as resistant. The lines LOF-027, LOF-105, LPS-124, MEL-008 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucumis melo; Podosphaera xanthii; Powdery mildew; Resistance; Selection.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362011000300021

Identification of new Bremia lactucae races in lettuce in São Paulo state
Provedor de dados: 75
Autores: Castoldi,Renata; Charlo,Hamilton César de O; Dalpian,Tagli; Melo,Danilo M; Botelho,Adelita P; Braz,Leila T.
Lettuce is the most consumed leafy vegetable in Brazil. However, its production has faced increasing difficulties mainly due to the infestation of producing areas with Bremia lactucae, the causing agent of downy mildew, the worst disease in lettuce. The aim of this study was to identify B. lactucae races occurring in lettuce producing areas of São Paulo state, during 2008 and 2009. Lettuce leaf samples containing B. lactucae sporangia were collected in the major lettuce producing areas of São Paulo. Each sample was considered an isolate. After the multiplication of sporangia in the susceptible cultivar Solaris, with subsequent inoculation in the differentiating cultivars, the evaluations were performed on the same day of the first sporulation in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lactuca sativa L; Genes DM; Downy mildew; Resistance.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362012000200005

Reaction of wild Solanaceae rootstocks to the parasitism of (Meloidogyne javanica)
Provedor de dados: 75
Autores: Cardoso,Jéssica; Tonelli,Luiza; Kutz,Talita S; Brandelero,Fernanda D; Vargas,Thiago de O; Dallemole-Giaretta,Rosangela.
ABSTRACT Intensive production of vegetables in greenhouses can increase the amount of inoculum of soil-borne pathogens, such as the root-knot nematode. Thus, in this study we aimed to evaluate the potential of Solanaceae as rootstocks resistant to Meloidogyne javanica nematodes as an alternative to tomato grafting. The experiment consisted of seven treatments: wild species joá-vermelho (Solanum capsicoides), joá-bagudo (Solanum palinacanthum), joá-bravo (Solanum viarum), jurubeba (Solanum spp.) and the commercial tomato cultivars Santa Cruz Kada, Batalha and Guardião. The analyzed variables were gall index; egg mass index; final nematode population; reproduction factor (FR) and reaction: susceptibility, resistance and immunity; fresh shoot and root mass...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum lycopersicum; Root-knot nematode; Grafting; Resistance.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362019000100017

Morpho-agronomic characterization of sweet potato germplasm
Provedor de dados: 75
Autores: Alves,Rodrigo P; Blank,Arie F; Oliveira,Alisson Marcel S; Santana,Aléa Dayane D; Pinto,Vanderson S; Andrade,Thiago M.
ABSTRACT Sweet potato (Ipomoea batatas) spreads mainly by vegetative propagation, and therefore this vegetable may have duplicate accessions in germplasm banks. The authors aimed to characterize morpho-agronomically the sweet potato germplasm from the Active Germplasm Bank (AGB) of Universidade Federal de Sergipe (UFS).The experiment was carried out at the Research Farm “Campus Rural da UFS”. The experimental design was a randomized block design, testing 73 sweet potato accessions with two replicates and four plants per plot. Morpho-agronomic traits of aboveground part and roots were evaluated. We observed that the leaf lobe type, the number of lobes per leaf, shape of central lobe, and general leaf shape were traits which provided the most variability...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ipomoea batatas; Resistance; Diversity; Descriptors; Productivity.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362017000400534

Reaction of strawberry cultivars to root-knot and root-lesion nematodes
Provedor de dados: 75
Autores: Brum,Daniele de; Marchi,Priscila Monalisa; Gonçalves,Michel A; Cruz,Fernanda F; Antunes,Luis Eduardo C; Gomes,Cesar B.
ABSTRACT Considering the economic importance of strawberry in Brazil, with a clear migration trend from the soil to innovative systems on substrates, it is fundamental to evaluate the available cultivars in the market regarding tolerance to pathogens with potential for infestation. The reaction of eight commercial strawberry cultivars (Festival, Camino Real, Camarosa, Oso Grande, Monterey, San Andreas, Aromas, and Albion) to Meloidogyne and Pratylenchus species was evaluated. Strawberry cultivars were maintained in individual pots with sterilized soil and inoculated with 5,000 eggs + second stage juveniles of Meloidogyne arenaria, M. incognita, M. javanica or M. hapla or 1,000 specimens of Pratylenchus zea or P. brachyurus per plant. The experiment was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fragaria x ananassa; Meloidogyne spp.; Pratylenchus spp.; Resistance.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362019000100065

Reaction of beet genotypes to the Beet Leaf Spot in the upper Valley of Itajaí, Santa Catarina state, Brazil
Provedor de dados: 75
Autores: Marcuzzo,Leandro L; Duarte,Tatiana S; Hilleshein,Patrícia C; Scheidt,Bruno T.
In the region of the Upper Valley of Itajaí, Santa Catarina state, Brazil, family farmers cultivate beet (Beta vulgaris) along with other products such as, onion. However, some diseases, including the Beet Leaf Spot (Cercospora beticola), have compromised the success of the beet crop due to severe leaf incidence. The objective of this study was to evaluate the reaction to the Beet Leaf Spot, under local conditions, in the spring-summer season, of the beet cultivars most frequently used by farmers in the region, namely All Green, Stays Green, Early Wonder, Cabernet, Boro, Modana and Itapuã. Two experiments, with a 30-day interval between sowings were carried out in EPAGRI, Experimental Station of Ituporanga. The experimental design was of randomized...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beta vulgaris; Cercospora beticola; Cultivars; Resistance; Disease severity.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362015000100106

A reliable begomovirus inoculation method for screening Lycopersicon esculentum lines
Provedor de dados: 75
Autores: Inoue-Nagata,Alice K; Nagata,Tatsuya; Ávila,Antonio C de; Giordano,Leonardo de B.
Due to failures of infection after mechanical inoculation of begomovirus on tomato (Lycopersicon esculentum Mill.) plants, an efficient and reliable begomovirus inoculation method was developed using the whitefly vector (Bemisia tabaci). Virus acquisition was carried out using a 'Tube-cage', made of a polypropylene tube, containing one to two day-old whiteflies and a tomato plant apex infected with a begomovirus isolate. After 48 h of acquisition access period, inoculation was done using a 'Ring-cage', containing viruliferous whiteflies, attached to the abaxial side of the leaf of young tomato plants. 48 hours after acquisition, the whiteflies were eliminated and the inoculated plants were incubated for 28 days under greenhouse conditions. Three...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Lycopersicon esculentum; Inoculation; Resistance; Screening; Geminivirus.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362007000300024

Evaluation of tomato rootstocks to Ralstonia solanacearum and R. pseudosolanacearum in Mata mesoregion, PE
Provedor de dados: 75
Autores: Albuquerque,Géssyka R; Lucena,Lucas P; Assunção,Emanuel F; Mesquita,Júlio Carlos P; Silva,Adriano Márcio F; Souza,Elineide B; Nicoli,Alessandro; Gama,Marco Aurélio S.
ABSTRACT Bacterial wilt limits tomato production and resistant rootstocks could be important for the integrated management of the disease. Since there is an interaction between local bacterial strains and tomato genotype, this study aimed to evaluate 14 tomato rootstocks to bacterial wilt in the Mata mesoregion of Pernambuco state, Brazil. The rootstocks reaction to two sequevars of Ralstonia solanacearum and two of R. pseudosolanacearum was evaluated in four experiments carried out in the greenhouse using the completely randomized experimental design, with four replications composed of four plants each. Seven genotypes were selected to evaluate the reaction to bacterial wilt as rootstocks grafting in tomato plants ‘Tomini F1’ in a production area with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum lycopersicum; Grafting; Genetic resistance; Resistance.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362021000100072

Reaction of tomato hybrids carrying the Ty-1 locus to Brazilian bipartite Begomovirus species
Provedor de dados: 75
Autores: Boiteux,Leonardo Silva; Oliveira,Valter Rodrigues; Silva,Cézar Honório; Makishima,Nozomu; Inoue-Nagata,Alice K; Fonseca,Maria Esther de Noronha; Giordano,Leonardo de Britto.
The number of tomato-infecting begomoviruses has increased in Brazil after the introduction of the polyphagous vector Bemisia tabaci biotype B. The Ty-1 locus, introgressed from Lycopersicon chilense, controls tolerance to species of the monopartite Tomato yellow leaf curl virus (TYLCV) complex in Europe and the Middle East. However, little information is available about the Ty-1 effectiveness against species of the bipartite Begomovirus complex occurring in Brazil. Heterozygous (Ty-1/ty-1) and homozygous (ty-1/ty-1) hybrids were evaluated for reaction to Begomovirus isolates under open field conditions in two growing areas in Central Brazil. Test plants were evaluated under natural inoculation with high vector pressure. Evaluation was done using a disease...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bipartite geminivirus; Lycopersicon chilense; Resistance; Tomato.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362007000100005

Reaction of advanced inbred lines of Habanero pepper to Ralstonia pseudosolanacearum and Phytophthora capsici
Provedor de dados: 75
Autores: Soares,Renato Silva; Ribeiro,Cláudia Silva da Costa; Ragassi,Carlos Francisco; Lopes,Carlos Alberto; Carvalho,Sabrina Isabel Costa; Reis,Ailton; Braz,Leila Trevisan; Reifschneider,Francisco José Becker.
ABSTRACT Habanero pepper is important in the international market and is becoming popular in the national market; however, few cultivars adapted and resistant to devastating diseases caused by the soilborne pathogens Ralstonia pseudosolanacearum (RP) and Phytophthora capsici (PC) are available in Brazil. The aim of this study was to evaluate the reaction of Habanero-type advanced inbred lines, developed by Embrapa Hortaliças breeding program, to RP and PC. Although not required for the process of protection, registration and release of new cultivars, this information is important. CNPH 15.737; CNPH 15.740; CNPH 15.744; CNPH 15.745; CNPH 15.749 and CNPH 15.750 were inoculated with three RP and one PC isolates. Plants showing wilted leaves (RP) and stem...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capsicum; Bacterial wilt; Phytophthora wilt; Incidence; Severity index; Resistance.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362019000400395

Таксономический  состав гетеротрофных бактерий Одесского прибрежья, устойчивых к тяжелым металлам
Provedor de dados: 13
Autores: Иваница, В. А.; Бухтияров, А. Е.
Из прибрежных вод Одесского залива - Нефтяной гавани, пляжей “Дельфин” и “Дача Ковалевского” изолированы штаммы доминирующих гетеротрофных грамотрицательных бактерий с фоновыми и высокими уровнями устойчивости к ионам Pb2+, Cd2+ и Hg2+. Изучение фенотипических признаков выделенных штаммов бактерий позволило отнести подавляющее их большинство к родам Vibrio, Pseudomonas, Aeromonas и Enterobacter. Массовое бактериальное население в исследованных районах представлено в основном видами Vibrio alginolyticus, V. campbellii, V. harveyi, V. natriegens, V. nereis, Pseudomonas nautica, P. stutzeri, Enterobacter agglomerans, Aeromonas veronii, устойчивые к свинцу - видами Vibrio campbellii, V. harveyi, V. natriegens, V. nereis, Pseudomonas nautica, Enterobacter...
Tipo: Journal Contribution
Palavras-chave: Гетеротрофные морские бактерии; Таксономия; Устойчивость; Ионы Pb2+; Cd2+; Hg2+; Черное море; Heterotrophic marine bacteria; Taxonomy; Resistance; Ions Pb2+; Black Sea Taxonomy Taxonomy http://aims.fao.org/aos/agrovoc/c_7631.
Ano: 2004
URL: http://repository.ibss.org.ua/dspace/handle/99011/95

Resistência de variedades e tipos do algodoeiro arbóreo-Gossypium spp ao ataque da broca (Eutinobothrus brasiliensis, Hambleton 1937).
Provedor de dados: 14
Autores: FREIRE, E. C.; VIEIRA, F. V.; SANTOS, J. H. R. dos; ALVES, J. F.; ALBUQUERQUE, J. J. L. de.
bitstream/item/33293/1/CNPA-DOCUMENTO-10-RESISTENCIA-DE-VARIEDADES-E-TIPOS-DO-ALGODOEIRO-ARBOREO-GOSSYPIUM-SPP-AO-ATAQUE.pdf
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Cultivares; Obtencao; Rim de boi; Cruzeta Serido; Pest; Resistance; Cultivar; Worm; Pink Bollworm.; Algodão; Alabama Argillacea; Broca; Curuquerê; Criação; Eutinobothrus Brasiliensis; Gossypium spp; Inseto; Gossypium Hirsutum Marie Galante; Lagarta Rosada; Mocó; Platyedra Gossypiella; Praga; Resistência.; Gossypium barbadense; Cotton.
Ano: 1982
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/262590

Comportamento de quatro cultivares de guar na região do Alto Sertão Pernambucano.
Provedor de dados: 14
Autores: AGUIAR FILHO, S. P. de.
Tem como objetivo conseguir culturas alternativas para o sistema produtivo dos agricultores da regiao semi-arida do Nordeste brasileiro. A EMBRAPA-CPATSA, vem desenvolvendo trabalhos de pesquisa com a cultura do guar, introduzida nessa regiao em 1974 pela Celanese do Brasil - Fibras Quimicas Ltda. Os experimentos foram instalados nos Campos Experimentais de Bebedouro (irrigado) e da Caatinga (sequeiro), no municipio de Petrolina,PE. Os solos utilizados foram classificados como latossolo unidade 37 AB para a area irrigada e Podzolico Vermelho-Amarelo Tb planossolico. A fraca textura areno-argilosa, cascalhente, fase caatinga, relevo plano, substrato muscovita xisto, na area de sequeiro.
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Cultura resistente a seca; Comportamento; Cyamopsis tetragondoba; Pernambuco; Alto Sertao; Resistance; Variety; Semi-arid region.; Guar; Variedade.; Drought.
Ano: 1983
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/131305

Convivência com a seca no semi-árido brasileiro.
Provedor de dados: 14
Autores: EMBRAPA. Centro de Pesquisa Agropecuária do Trópico Semi-Árido.
Aborda sobre o semi-árido brasileiro, as tecnologias disponíveis para agricultura e pecuária, o retorno econômico das principais tecnologias. Os recursos necessários, a cooperação internacional e o CPATSA.
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Convivência; Brasil; Nordeste; Região semi-árida; Resistance; Northeast; Semi-arid region; Natural research.; Recurso natural; Seca.; Drought; Brazil.
Ano: 1980
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/131961

Resistência de gramíneas forrageiras à cigarrinha-das-pastagens Deois flavopicta (Stal 1854).
Provedor de dados: 14
Autores: COSENZA, G. W.
Em centeiros de 4m x 5 m, instados em pastagens de Brachiaria decumbens infestadas de cigarrinhas, testou-se o nível de resistência de gramíneas forrageiras à Deois flavopicta, avaliado pelo número de ninfas por aneiro e pela nota de dano atribuída, de acordo com o dano causado pelas cigarrinhas a cada capim. Os capins que demonstraram maior nível de resist~encia foram: Hyparrhenia rura (Jaraguá); Andropogon gayanus (cv. Planaltina); Brachiaria brizanth (Brizantão); Cynodon plectostachys (Estrela); e Panicum maximum (Colonião folha-larga). Os mais suscetíveis foram: Brachiaria ruziziensis e B. decumbens. Procedeu-se ao estudo do mecanismo de reistência e ase para a resistência de dez capins, em condições de gaiola telada e de laboratório. Verificaram-se os...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Gramineas forrageiras; Insetos; Cigarrinha-das-pastagens; Savanna; Insect; Resistance; Spitlebug.; Brachiaria; Cerrado; Deois Flavopicta; Gramínea; Resistência.
Ano: 1983
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/982245

Texas 953, Gossypium hirsutum L. como fonte de resistencia ao curuquere do algodoeiro Alabama argillacea Hubner.
Provedor de dados: 14
Autores: LUKEFAHR, M. J.; BRAGA SOBRINHO, R.; VIEIRA, R. de M.
bitstream/item/111113/1/BOLPES16.pdf
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Antibiose; Nivel de resistencia; Raca primitiva; Pest; Resistance; Leafworm; Leafworm infestation; Resistance level; Primitive racestock.; Alabama Argillacea; Algodão; Gossypium Hirsutum; Infestação; Larva; Praga; Resistência.; Antibiosis; Cotton.
Ano: 1984
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/270794

Protocolo de tecnologia: selecao para resistencia a doencas em hortalicas. 4. Tomateiro - Murcha-de-verticilio (Verticillium dahliae e V. albo-atrum).
Provedor de dados: 14
Autores: SANTOS, J. R. M. dos.
bitstream/CNPH-2009/18795/1/cot_11_4.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Diseases; Selection; Resistance; Fungus.; Doença; Fungo; Lycopersicon Esculentum; Seleção; Resistência; Tomate; Verticillium Dahliae.; Verticillium albo-atrum; Tomatoes.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/767614

Avaliação de acessos do banco de germoplasma de mandioquinha-salsa da Embrapa Hortaliças para resistência a Meloidogyne spp. no campo.
Provedor de dados: 14
Autores: CHARCHAR, J. M.; SANTOS, F. F. dos; MOITA, A. W.
bitstream/CNPH-2009/33235/1/bpd_23.pdf
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Mandioquinha-salsa; Batata baroa; Arracacha; Peruvian carrot; Germplasm bank; Resistance; Diseases; Nematodes.; Arracacia Xanthorrhiza; Banco de Germoplasma.; Meloidogyne.
Ano: 2007
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/781364

Protocolo de tecnologia: selecao para resistencia a doencas em hortalicas. 1. Etapas para selecao de fontes de resistencia a doencas.
Provedor de dados: 14
Autores: SANTOS, J. R. M. dos.
bitstream/CNPH-2009/18792/1/cot_11_1.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Heranca; Resistance; Diseases; Selection; Genetic resistantce; Inoculation; Inheritance.; Doença; Hortaliça; Inoculação; Resistência; Resistência Genética; Seleção.; Vegetables.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/767609

Propriedades físicas dos principais solos da Amazônia brasileira em condições naturais.
Provedor de dados: 14
Autores: BAENA, A. R. C.; DUTRA, S.
bitstream/item/31900/1/CPATU-BP33.pdf
Tipo: Séries anteriores (INFOTECA-E)
Palavras-chave: Propriedade física; Densidade; Brasil; Resistance; Physical proprieties; Yield.; Produtividade; Porosidade; Resistência; Solo.; Amazonia; Density; Porosity; Soil.
Ano: 1982
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/381146

Caracteristicas de brotacoes de tuberculos de clones de batata resistentes a pinta-preta.
Provedor de dados: 14
Autores: BRUNE, S.
bitstream/CNPH-2009/18697/1/pa_34.pdf
Tipo: Séries anteriores (INFOTECA-E)
Palavras-chave: Brasilia; Distrito Federal; Brasil; Resistance; Diseases; Fungus.; Alternaria Solani; Batata; Brotacao; Cerrado; Clone; Doença; Fungo; Resistência; Solanum Tuberosum.; Brazil; Clones; Potatoes; Sprouting.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/767510

Entwicklung Cytologischer und Biochemischer Kriterien zur Selektion Resistenter Heveapflanzen gegen Microcyclus ulei.
Provedor de dados: 14
Autores: LIBEREI, R.; JUNQUEIRA, N. T. V.
bitstream/item/181495/1/FOL4041.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Mal-das-folhas; Rubber tree; Species; Diseases; South American Leaf blight; SALB; Resistance; Doença; Espécie; Folha; Fungo; Hevea; Microcyclus Ulei; Resistência; Seringueira; Leaves.
Ano: 1987
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/665273

Vulnerabilidade dos pequenos agricultores em relação as tecnologias de convivência com a seca: um estudo de caso.
Provedor de dados: 14
Autores: CAVALCANTI, N. de B.; OLIVEIRA, C. A. V.; BRITO, L. T. de L.
Os pequenos agricultores da regiao semi-arida do Nordeste brasileiro tem, na agricultura de subsistencia ou familiar, sua principal fonte de renda. Estes agricultores sao bastante vulneraveis as condicoes agrossocioeconomicas e climaticas da regiao e, sobretudo, em relacao as tecnologias desenvolvidas pela pesquisa agricola para a convivencia com a seca. Este trabalho teve como objetivos identificar algumas tecnologias de convivencia com a seca e verificar a vulnerabilidade dos pequenos agricultores em relacao a estas tecnologias.
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Convivência; Adoção; Resistance; Adoption; Small farmers; Natural resource.; Recurso natural; Pequeno Produtor; Seca; Tecnologia.; Drought; Technology.
Ano: 1998
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/131732

Avaliação de resistência de soja as principais pragas da cultura.
Provedor de dados: 14
Autores: MARQUES, G. L.; VIEIRA, S. A.; BEN, J. R.
bitstream/item/161037/1/CNPT-ID11568-1.pdf
Tipo: Outras publicações técnicas (INFOTECA-E)
Palavras-chave: Brasil; Insect; Pest; Resistance; Rio Grande do Sul; Soybean.; Inseto; Melhoramento.; Brazil; Breeding.
Ano: 1983
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/823352

Recentes pesquisas sobre doenças da seringueira.
Provedor de dados: 14
Autores: GONÇALVES, J. R. C.
Publicação dividida em 3 partes: I. Resistência de clones de seringueira Fx e IAN a doenças da folha no Brasil; II. Resistência de clones de seringueira provenientes do Brasil e da América Central a "isolares" de Dothidella ulei sob condições de casa de vidro; III. Cancro do enxerto da seringueira
Tipo: Séries anteriores (INFOTECA-E)
Palavras-chave: Controle; Queima de folha; Dothidella ulei; Rubber tree; Control; Resistance; Canker; Leaf disease; Graft; Cancro; Clone; Enxerto; Doença; Folha; Fungo; Melhoramento; Resistência; Seringueira; Breeding.
Ano: 1970
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/387165

Protocolo de tecnologia: selecao para resistencia a doencas em hortalicas. 5. Tomateiro - Pinta-preta (Alternaria solani).
Provedor de dados: 14
Autores: SANTOS, J. R. M. dos.
bitstream/CNPH-2009/18796/1/cot_11_5.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Diseases; Resistance; Fungus; Selection.; Alternaria Solani; Doença; Fungo; Lycopersicon Esculentum; Seleção; Resistência; Tomate.; Tomatoes.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/767615

Enxertia de copa em seringueira.
Provedor de dados: 14
Autores: EMBRAPA. Centro Nacional de Pesquisa de Seringueira e Dendê.
Sao apresentados varios trabalhos visando o controle das enfermidades nos seringais atraves da enxertia de copa da seringueira, que surge como uma das mais promissoras alternativas para a solucao do problema.
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Copa; Brasil; Amazonas; Rubber tree; Species; Crown; Graft; Diseases; Resistance; Doença; Enxerto; Espécie; Hevea; Resistência; Seringueira.
Ano: 1989
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/665161

Seleção de clones de seringueira, através do número de anéis laticíferos e desenvolvimento em condições de campo.
Provedor de dados: 14
Autores: KALIL FILHO, A. N.; AZEVEDO, A. C. de.
Atraves de selecao em uma populacao de mais de 1200 clones do CNPSD, percebeu-se que sao muito poucos os clones de H. brasiliensis com bons niveis de resistencia ao M. ulei.
Tipo: Outras publicações técnicas (INFOTECA-E)
Palavras-chave: Mal-das-folhas; Brasil; Amazonas; Rubber tree; Fungal diseases; Resistance; South American leaf blight; SALB.; Doença; Folha; Fungo; Hevea Brasiliensis; Microcyclus Ulei; Resistência; Seringueira.; Leaves.
Ano: 1987
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/665267

Avaliação das características tecnológicas da fibra do algodão produzido na região Nordeste.
Provedor de dados: 14
Autores: GOMES, I. F.; BELTRAO, N. E. de M.; CRISOSTOMO. J. R.; CAVALCANTI, F. B.; SILVA, F. de A.; SOUZA, R. P. de.
bitstream/item/33278/1/AVALIACAO-DAS-CARACTERISTICAS.pdf
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Uniformidade; Finura; Percentagem; Brasil; Nordeste; Paraiba; Rio Grande do Norte; Ceara; Piaui; Pernambuco; Fiber; Lengt; Uniformity; Resistance; Tiness; Percent.; Algodão; Comprimento; Fibra; Gossypium Hirsutum; Qualidade; Resistência; Tecnologia.; Cotton; Technology.
Ano: 1986
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/262736

Protocolo de tecnologia: selecao para resistencia a doencas em hortalicas. 3. Tomateiro - Murcha-de-fusario (Fusarium oxysporum f.sp. lycopersici).
Provedor de dados: 14
Autores: SANTOS, J. R. M. dos.
bitstream/CNPH-2009/18794/1/cot_11_3.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Diseases; Resistance; Selection; Fungus.; Doença; Fungo; Fusarium Oxysporum Lycopersici; Lycopersicon Esculentum; Resistência; Seleção; Tomate.; Tomatoes.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/767613

Protocolo de tecnologia: selecao para resistencia a doencas em hortalicas. 2. Tomateiro - Mancha-de-estenfilio (Stemphylium spp.).
Provedor de dados: 14
Autores: SANTOS, J. R. M. dos.
bitstream/CNPH-2009/18793/1/cot_11_2.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Diseases; Resistance; Fungus; Selection.; Doença; Fungo; Lycopersicon Esculentum; Seleção; Resistência; Stemphylium; Tomate.; Tomatoes.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/767612

Resistencia de batata a pinta-preta.
Provedor de dados: 14
Autores: BRUNE, S.
bitstream/CNPH-2009/18696/1/pa_33.pdf
Tipo: Séries anteriores (INFOTECA-E)
Palavras-chave: Brasilia; Distrito Federal; Brasil; Production; Resistance; Diseases; Fungus; Competition.; Alternaria Solani; Batata; Cerrado; Competição de Variedade; Doença; Fungo; Produção; Resistência; Solanum Tuberosum.; Brazil; Potatoes; Varieties.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/767509

Proposição para o manejo integrado das cigarrinhas-das-pastagens.
Provedor de dados: 14
Autores: VALERIO, J. R.; KOLLER, W. W.
Manejo de pragas em pastagens; Caracterizacao do problema, sobre a graminea forrageira, sobre o inseto; Consideracoes sobre as alternativas de controle, inseticidas quimicos, praticas culturais, resistencia de plantas aos insetos, controle biologico; Alguns resultados obtidos para fundamentar as proposicoes de manejo, efeito de diferentes cargas animal, durante o periodo seco do ano, efeito da remocao da cobertura vegetal morta acumulada ao nivel do solo em pastagens de brachiaria decumbens;Tratos culturais em pastagens de brachiaria decumbens Stapf; Selecao de gramineas resistentes as cigarrinhas das pastagens; Proposicoes para o manejo integrado das cigarrinhas das pastagens.
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Cigarrinha-das-pastagens; Manejo integrado; Controle; Carga animal; Queima controlada; Spittlebugs; Integrated control; Resistance; Controlled burning.; Cobertura Vegetal; Controle Biológico; Controle Químico; Gramínea; Inseticida; Gramineae; Ninfa; Pastagem; Ovo; Resistência; Queimada; Zulia Entreriana.; Grazing intensity; Eggs; Chemical control; Biological control; Insecticides; Nymphs; Pastures; Plant litter.
Ano: 1992
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/321470

Semi-Árido: aprendendo a conviver com a seca.
Provedor de dados: 14
Autores: MATTALO JUNIOR, H.; LOPES, P. R. C.
bitstream/item/130447/1/Paulo.pdf
Tipo: Artigo de divulgação na mídia (INFOTECA-E)
Palavras-chave: Convivencia com a seca; Mudanças climáticas; Semi-arido; Resistance; Natural resource.; Recurso natural; Clima; Desertificação.; Drought.; Climate; Desertification.
Ano: 2001
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/134487

Protocolo de tecnologia: selecao para resistencia a doencas em hortalicas. 6. Tomateiro - Septoriose (Septoria lycopersici).
Provedor de dados: 14
Autores: SANTOS, J. R. M. dos.
bitstream/CNPH-2009/18797/1/cot_11_6.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Diseases; Selection; Resistance; Fungus.; Doença; Fungo; Lycopersicon Esculentum; Resistência; Seleção; Septoria Lycopersici; Tomate.; Tomatoes.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/767616

Reação de cultivares e linhagens de algodoeiro a murcha causada por Fusarium oxysporum f.s.p. vasinfectum.
Provedor de dados: 14
Autores: LIMA, E. F.; CARVALHO, J. M. F. C.; TAVARES SOBRINHO, J.; SANTOS, J. W. dos.
bitstream/item/33379/1/REACAO-DE-CULTIVARES.pdf
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Suscetibilidade; Murcha; Fusarium oxysporum f; Sp; Vasinfectum; Brasil; Paraiba; Campina Grande; Resistance; Susceptibilidade; Survival.; Algodão; Fusariose; Doença; Gossypium Hirsutum; Resistência; Sobrevivência.; Cotton.
Ano: 1991
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/262818

Como o pecuarista do Semi-Árido nordestino deve enfrentar emergencialmente uma seca.
Provedor de dados: 14
Autores: GUIMARAES FILHO, C.
bitstream/CPATSA/7270/1/INT6.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Brasil; Nordeste; Resistance; Northeast.; Produção animal; Pecuária; Resistência; Seca; Tecnologia.; Animal production; Drought; Livestock; Brazil; Technology.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/132169

Resistencia de germoplasma de abobora e moranga a Phytophthora capsici.
Provedor de dados: 14
Autores: LOPES, J. F.; BRUNE, S.
bitstream/CNPH-2009/18691/1/pa_27.pdf
Tipo: Séries anteriores (INFOTECA-E)
Palavras-chave: Moranga; Brasilia; Distrito Federal; Brasil; Pumpkin; Winter squash; Resistance; Diseases; Fungus.; Abóbora; Cucúrbita Máxima; Cucúrbita Moschata; Cerrado; Doença; Fungo; Germoplasma; Phytophthora Capsici; Resistência.; Brazil; Germplasm.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/767505

Doenças da seringueira.
Provedor de dados: 14
Autores: GASPAROTTO, L.; FERREIRA, F. A.
Mal-das-folhas da seringueira: historico de ocorrencias e importancia economica, distribuicao geografica e hospedeiros. Microcyclus ulei: sintomatologia, isolamento, caracteristicas culturais e morfologicas, patogenicidade, variabilidade para virulencia a Hevea spp. e para resistencia ao mal-das-folhas. Ciclo do mal-das-folhas. Epidemiologia do mal-das-folhas. Controle: areas de escape, fungicidas, resistencia da planta, enxertia de copa.
Tipo: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Mal-das-folhas; SALB; Morfologia; Ciclo; Virulencia; Brasil; Rubber tree; Fungal diseases; South American leaf blight; Geographic distribution; Host; Symptoms; Isolation methods; Morphology; Cicle; Resistance; Controle Químico; Distribuição Geográfica; Doença; Epidemiologia; Espécie; Folha; Fungo; Hevea; Hospedeiro; Isolamento; Microcyclus Ulei; Patogenicidade; Resistência; Seringueira; Sintoma; Chemical control; Epidemiology; Leaves; Pathogenicity; Virulence.
Ano: 1989
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/667342

Origine et evolution de l'agriculture familiale dans le Nordeste semi-aride.
Provedor de dados: 14
Autores: SABOURIN, E.; CARON, P.
Apres une breve description du cadre agraire régional, ce chapitre résume l'histoire de l'agriculture du Nordeste semi-aride depuis ses origines. Il montre comment et pourquoi l'agriculture familiale, longtemps ignorée, a évolué jusqu'à devenir la principale forme de production agricole dans Ia région, et comment elle fait l'objet, depuis quelques années, d'un regain d'intérêt dans l'ensernble du Brésil.
Tipo: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Adaptacao; Modernizacao agricola; Nordeste; Regiao semi-arida; Familiar farms; Agricultural development; Colonization; Adaptation; Resistance; Northeast; Semiarid region; Agricultura Familiar; Colonização; Desenvolvimento Agrícola; Resistência; Brazil; Modernization.
Ano: 2001
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/134405

Adoção de tecnológia para convivência do homem com a seca na região Semi-Árida do Nordeste brasileiro: o caso da cisterna rural.
Provedor de dados: 14
Autores: CAVALCANTI, N. de B.; OLIVEIRA, C. A. V.; BRITO, L. T. de L.
bitstream/CPATSA-2009-09/6910/1/BPD48.pdf
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Convivência com a seca; Cisterna rural; Agricultor baixa renda; Nordeste; Região semi-árida; Rural cistern; Resistance; Small farmers; Northeast; Semi-arid region.; Tecnologia.; Drought; Technology.
Ano: 1995
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/131729

Avaliação de fontes de tolerancia ao vírus do mosaico dourado do feijoeiro (Bean Golden Mosaic Virus - BGMV).
Provedor de dados: 14
Autores: PAIVA, F. de A.; GOULART, A. C. P.
bitstream/item/63634/1/Doc.-2-paiva.pdf
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Tolerancia; Bean; Resistance; Tolerant; Disease; Golden mosaic.; Feijão; Doença; Genótipo; Mosaico Dourado; Phaseolus Vulgaris; Resistência; Vírus.; Genotype.
Ano: 1995
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/239937

Mocinha: cultivar de abobora para verao, resistente a podridao dos frutos.
Provedor de dados: 14
Autores: EMBRAPA. Centro Nacional de Pesquisa de Hortaliças.
bitstream/item/181443/1/digitalizar0088.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Pumpkin; Squash; Resistance; Phytophthora Capsici; Resistência.
Ano: 1991
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/751115

Reação de genótipos de feijão-mungo a Meloidogyne javanica e Pratylenchus brachyurus em condições de campo.
Provedor de dados: 14
Autores: SHARMA, R. D.
RESUMO: Foram avaliados 10 genótipos de feijão-mungo (Vidna radiata L.) quanto à infecção por nematóide-das-galhas, Meloidogyne javanica e por nematóide-das-lesões, Pratylenchus brachyurus na área experimental da Embrapa Cerrados. A população inicial dos nematóides (Pi) no solo, por parcela, foi avaliada antes do plantio (novembro de 1985). Aos 75 dias após a germinação do feijão-mungo, na época de formação de grãos (janeiro de 1986), uma amostra composta de cinco subamostras de solo e raízes de cada genótipo foi coletada para determinação da população final (Pf) e do fator de reprodução (Fr) dos nematóides. Os nematóides foram extraídos de 100g de solo e 10 g de raízes pelo método modificado de Coolen (1979). Verificou-se a reprodução de M. javanica e P....
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Nematóide de planta; Nematóide das lesões; Bean; Plant galls; Plant nematodes; Resistance; Root lesion nematode.; Feijão; Galha; Phaseolus Vulgaris; Resistência.; Vigna radiata.; Nematoda.
Ano: 2004
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/569102

Variedades: a solução para a bananicultura.
Provedor de dados: 14
Autores: DUARTE, O. R.
Tipo: Folhetos
Palavras-chave: Variedades; Disease; Resistance; Bananicultura; Banana; Doença; Resistência; Varieties.
Ano: 1997
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/688078

A first genetic linkage map of the European flat oyster, Ostrea edulis : towards the identification of Bonamia resistance QTLs
Provedor de dados: 5
Autores: Lallias, Delphine; Lapegue, Sylvie; Haley, Chris; Heurtebise, Serge; Boudry, Pierre; Beaumont, Andy.
The flat oyster Ostrea edulis is an endemic European oyster species, found on both Atlantic and Mediterranean coasts. Its aquacultural production has dramatically decreased due to two successive diseases caused by the intracellular parasites Marteilia refringens and Bonamia ostreae. Since 1985, Ifremer has undertaken a breeding program to produce oyster families which are tolerant to Bonamia. In this context, the next step is to identify QTLs for resistance to this parasite. A genetic map is therefore being established as a basis for QTL work. The reference family is an F2 family produced by single pair mating of two oysters from the same F1 family. The F1 family was itself produced from a bi-parental cross between a wild oyster and an individual from the...
Tipo: Text
Palavras-chave: Genetic linkage map; Parasite; Genetic; QTLs; Resistance; Bonamia ostreae; Ostrea edulis; Flat oyster.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/acte-3464.pdf

Selective breeding to improve resistance against summer mortality in the Pacific oyster Crassostrea gigas : results after 3 generations
Provedor de dados: 5
Autores: Boudry, Pierre; Degremont, Lionel; Bedier, Edouard; Samain, Jean-francois.
Summer mortality of adults and juveniles has been reported in the Pacific oyster, Crassostrea gigas, for many years and in several countries. The French multidisciplinary program "Morest" aims to investigate the causes of the summer mortality in Crassostrea gigas. Within this program, we designed multi-site field experiments to assess to what extent genetic variability exists for summer mortality in French populations of C. gigas and to determine whether selective breeding could improve survival.
Tipo: Text
Palavras-chave: Growth; Resistance; Selective breeding; Genetic; Crassostrea gigas; Pacific oyster; Summer mortality.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/acte-3448.pdf

Compatibility Polymorphism Based on Long-Term Host-Parasite Relationships: Cross Talking Between Biomphalaria glabrata and the Trematode Schistosoma mansoni From Endemic Areas in Brazil
Provedor de dados: 5
Autores: Lima, Mariana G.; Montresor, Lângia C.; Pontes, Joana; Augusto, Ronaldo De C.; Silva, Jairo Pinheiro Da; Thiengo, Silvana C.
Sympatric snail populations have been kept in the laboratory since the isolation of the parasite from the field. To evaluate the influence of the intermediate host in the infectivity of S. mansoni, this allopatric strain was compared to two sympatric strains, from different geographical origins, and with different time of maintenance in the laboratory. Snail–trematode compatibility was accessed for a total of nine possible combinations (three snail populations, three schistosome strains), using different charges of parasite: 1, 5, 10, and 15 miracidia/snail. Each S. mansoni strain was characterized according to its infectivity phenotype that reflects the efficiency of their infection mechanism and all B. glabrata populations were characterized according to...
Tipo: Text
Palavras-chave: Snail-trematode; Host-parasite; Interaction; Compatible; Incompatible; Infectivity; Resistance; Schistosomiasis.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00489/60084/63419.pdf

Greater Mitochondrial Energy Production Provides Resistance to Ocean Acidification in “Winning” Hermatypic Corals
Provedor de dados: 5
Autores: Agostini, Sylvain; Houlbrèque, Fanny; Biscéré, Tom; Harvey, Ben P.; Heitzman, Joshua M.; Takimoto, Risa; Yamazaki, Wataru; Milazzo, Marco; Rodolfo-metalpa, Riccardo.
Coral communities around the world are projected to be negatively affected by ocean acidification. Not all coral species will respond in the same manner to rising CO2 levels. Evidence from naturally acidified areas such as CO2 seeps have shown that although a few species are resistant to elevated CO2, most lack sufficient resistance resulting in their decline. This has led to the simple grouping of coral species into “winners” and “losers,” but the physiological traits supporting this ecological assessment are yet to be fully understood. Here using CO2 seeps, in two biogeographically distinct regions, we investigated whether physiological traits related to energy production [mitochondrial electron transport systems (ETSAs) activities] and biomass (protein...
Tipo: Text
Palavras-chave: Ocean acidification; Hermatypic corals; Mitochondrial electron transport activity; Biomass; Resistance.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00677/78925/81293.pdf

High temperature induces transcriptomic changes in   Crassostrea gigas   that hinder progress of ostreid herpesvirus (OsHV-1) and promote survival
Provedor de dados: 5
Autores: Delisle, Lizenn; Pauletto, Marianna; Vidal-dupiol, Jeremie; Petton, Bruno; Bargelloni, Luca; Montagnani, Caroline; Pernet, Fabrice; Corporeau, Charlotte; Fleury, Elodie.
Of all environmental factors, seawater temperature plays a decisive role in triggering marine diseases. Like fever in vertebrates, high seawater temperature could modulate the host response to pathogens in ectothermic animals. In France, massive mortality of Pacific oysters, Crassostrea gigas, caused by the ostreid herpesvirus 1 (OsHV-1) is markedly reduced when temperatures exceed 24°C in the field. In the present study we assess how high temperature influences the host response to the pathogen by comparing transcriptomes (RNA sequencing) during the course of experimental infection at 21°C (reference) and 29°C. We show that high temperature induced host physiological processes that are unfavorable to the viral infection. Temperature influenced the...
Tipo: Text
Palavras-chave: Anti-viral molecular pathway; Host-pathogen interaction; Marine disease; OsHV-1; Resistance; Temperature.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00656/76806/77974.pdf

Modélisation de la résistance aux chocs de salinité des postlarves de Penaeus vannamei
Provedor de dados: 5
Autores: Aquacop, Aquacop; Le Moullac, Gilles; Damez, D.
The notion of penaeid shrimp postlarvae quality, which implies a survival potential, is still a subjective parameter. The zootechnical criteria and the visual observations are not sufficient to evaluate the physiological condition of the hatchery reared postlarvae. The resistance of postlarvae to salinity shocks is a representative criteria of their condition. The goal of this study is to present a non-linear regression model at 2 variables (size, salinity) for the P. vannamei postlarvae resistance to salinity shocks. Between the second and the twentieth day after metamorphosis; 5 salinity shocks (20, 15, 10, 5 and 20/00) were tested daily, each one with 50 postlarvae. Survival rates were recorded after 2 hrs. Concurrently, the postlarvae growth in the...
Tipo: Text
Palavras-chave: Salinity; Resistance; Growth; Postlarvae; Penaeus vannamei; Salinité; Résistance; Croissance; Postlarve; Penaeus vannamei.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/1991/publication-4430.pdf

Etude des interactions hôte/parasite chez l'huître plate Ostrea edulis et son parasite Bonamia ostreae
Provedor de dados: 5
Autores: Morga, Benjamin.
The history of the French oyster production highlights the fragility of this production against overexploitation and disease outbreaks. In particular, the production of flot oyster, Ostrea edulis, has decreased following the emergence of two parasitic diseases including bonamiosis. The means to fight against bonamiosis are relatively limited. They are mainly based on oyster health surveillance to limit the spread of the disease. However, the use of predictive models of disease progression in infected area would help to improve stock management and minimize the impact pathogens. Moreover the development of resistant animais could help to revive this production. These different approaches require appropriate diagnostic tools, a good knowledge of the life...
Tipo: Text
Palavras-chave: Huître plate; Ostrea edulis; Bonamiose; Bonamia ostreae; Interaction hôte-parasite; Expression; Résistance; Hémocytes; Hybridation soustractive suppressive; Flat oyster; Ostrea edulis; Bonamiosis; Bonamia ostreae; Interaction host-parasite; Expression; Resistance; Haemocytes; Suppressive subtractive hybridization.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00055/16664/14157.pdf

Symbiodinium     clades A and D differentially predispose     Acropora cytherea     to disease and     Vibrio     spp. colonization
Provedor de dados: 5
Autores: Rouze, Heloise; Lecellier, Gael; Saulnier, Denis; Berteaux-lecellier, Veronique.
Coral disease outbreaks have increased over the last three decades, but their causal agents remain mostly unclear (e.g., bacteria, viruses, fungi, protists). This study details a 14-month-long survey of coral colonies in which observations of the development of disease was observed in nearly half of the sampled colonies. A bimonthly qPCR method was used to quantitatively and qualitatively evaluate Symbiodinium assemblages of tagged colonies, and to detect the presence of Vibrio spp. Firstly, our data showed that predisposition to disease development in general, and, more specifically, infection by Vibrio spp. in Acropora cytherea depended on which clades of Symbiodinium were harbored. In both cases, harboring clade D rather than A was beneficial to the...
Tipo: Text
Palavras-chave: Coral disease; Dynamic; Resistance; Symbiodinium assemblages; Vibrio.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00307/41848/41080.pdf

Contribution of in Vivo Experimental Challenges to Understanding Flat Oyster Ostrea edulis Resistance to Bonamia ostreae
Provedor de dados: 5
Autores: Morga, Benjamin; Renault, Tristan; Faury, Nicole; Lerond, Sophie; Garcia, Celine; Chollet, Bruno; Joly, Jean-pierre; Lapegue, Sylvie; Harrang, Estelle; Arzul, Isabelle.
Bonamiosis due to the parasite Bonamia ostreae has been associated with massive mortality outbreaks in European flat oyster stocks in Europe. As eradication and treatment are not possible, the control of the disease mainly relies on transfer restriction. Moreover, selection has been applied to produce resistant flat oyster families, which present better survival and lower prevalence than non-selected oysters. In order to better understand the mechanisms involved in resistance to bonamiosis, cellular and molecular responses of 2 oyster groups (selected oysters and wild-type oysters) were analyzed in the context of experimental injection and cohabitation infections. Cellular responses including non-specific esterases detection, ROS production and...
Tipo: Text
Palavras-chave: Bonamia ostreae; Protozoan; Ostrea edulis; Resistance; Experimental infection; Haemocytes; Gene expression; Apoptosis.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00405/51665/52213.pdf

Bonamia ostreae, parasite de l'huître plate, Ostrea edulis: sa position taxonomique parmi les parasites du groupe "microcell", analyses des interactions hôte/parasite chez plusieurs populations d'huîtres plates
Provedor de dados: 5
Autores: Besnard-cochennec, Nathalie.
Bonamia ostreae is the causative agent of hemocyte disease. It has been detected first during mortalities occured in Franc in 1979. Bonamiosis spread rapidly among oysters farming in France and Europ. Another species, Bonamia sp. has been detected in New Zealand and Australia. These paasites were both included in the "microcell" group. This group contains 2 others parasites, Mikrocytos mackini affecting Crassostrea gigas in British Columbia (Canada) and M. roughleyi affecing Saccostrea glomerata in Australia. Structural and molecular caracterisation of all these parasites were realised. Results show tha B. ostreae, B. sp., B. exitiosus. Molecular tools are available for genus detection, Bonamia spp. and Mikrocytos and species identification (B. ostreae, B....
Tipo: Text
Palavras-chave: Bonamia ostreae; Ostrea edulis; Taxonomie; Diagnotic; PCR; In situ hybridation; Hémocytes; Lectines; Phagocytose; Résistance; Bonamia ostreae; Ostrea edulis; Taxonomy; Diagnotic; PCR; In situ hybridization; Hemocytes; Lectins; Phagocytosis; Resistance.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00211/32223/30671.pdf

A proteomic study of resistance to Brown Ring disease in the Manila clam, Ruditapes philippinarum
Provedor de dados: 5
Autores: Smits, M.; Artigaud, Sebastien; Bernay, B.; Pichereau, Vianney; Bargelloni, L.; Paillard, Christine.
Marine mollusk aquaculture has more than doubled over the past twenty years, accounting for over 15% of total aquaculture production in 2016. Infectious disease is one of the main limiting factors to the development of mollusk aquaculture, and the difficulties inherent to combating pathogens through antibiotic therapies or disinfection have led to extensive research on host defense mechanisms and host-pathogen relationships. It has become increasingly clear that characterizing the functional profiles of response to a disease is an essential step in understanding resistance mechanisms and moving towards more effective disease control. The Manila clam, Ruditapes philippinarum, is a main cultured bivalve species of economic importance which is affected by...
Tipo: Text
Palavras-chave: Bivalve; Diseases; Resistance; Manila clam; Vibrio tapetis; Proteomics; Immune response.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00615/72670/71758.pdf

An intimate link between antimicrobial peptide sequence diversity and binding to essential components of bacterial membranes
Provedor de dados: 5
Autores: Schmitt, Paulina; Rosa, Rafael D.; Destoumieux-garzon, Delphine.
Antimicrobial peptides and proteins (AMPs) are widespread in the living kingdom. They are key effectors of defense reactions and mediators of competitions between organisms. They are often cationic and amphiphilic, which favors their interactions with the anionic membranes of microorganisms. Several AMP families do not directly alter membrane integrity but rather target conserved components of the bacterial membranes in a process that provides them with potent and specific antimicrobial activities. Thus, lipopolysaccharides (LPS), lipoteichoic acids (LTA) or the peptidoglycan precursor Lipid II are targeted by a broad series of AMPs. Studying the functional diversity of immune effectors tells us about the essential residues involved in AMP mechanism of...
Tipo: Text
Palavras-chave: Functional diversity; Defensin; Anti-lipopolysaccharide factor; Mechanism of action; Resistance.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00286/39710/38165.pdf

Differential basal expression of immune genes confers Crassostrea gigas resistance to Pacific Oyster Mortality Syndrome
Provedor de dados: 5
Autores: De Lorgeril, Julien; Petton, Bruno; Lucasson, Aude; Perez, Valérie; Stenger, Pierre-louis; Degremont, Lionel; Montagnani, Caroline; Escoubas, Jean Michel; Haffner, Philippe; Allienne, Jean-françois; Leroy, Marc; Lagarde, Franck; Vidal Dupiol, Jeremie; Gueguen, Yannick; Mitta, Guillaume.
Background: As a major threat to the oyster industry, Pacific Oyster Mortality Syndrome (POMS) is a polymicrobial disease affecting the main oyster species farmed across the world. POMS affects oyster juveniles and became panzootic this last decade, but POMS resistance in some oyster genotypes has emerged. While we know some genetic loci associated with resistance, the underlying mechanisms remained uncharacterized. So, we developed a comparative transcriptomic approach using basal gene expression profiles between different oyster biparental families with contrasted phenotypes when confronted to POMS (resistant or susceptible). Results: We showed that POMS resistant oysters show differential expression of genes involved in stress responses, protein...
Tipo: Text
Palavras-chave: Pacific oyster; Oyster disease; Resistance; OsHV-1; Antiviral molecular pathways; Invertebrate immunity.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00602/71369/69811.pdf

Interaction between Insects, Toxins, and Bacteria: Have We Been Wrong So Far?
Provedor de dados: 5
Autores: Tetreau, Guillaume.
Toxins are a major virulence factor produced by many pathogenic bacteria. In vertebrates, the response of hosts to the bacteria is inseparable from the response to the toxins, allowing a comprehensive understanding of this tripartite host-pathogen-toxin interaction. However, in invertebrates, this interaction has been investigated by two complementary but historically distinct fields of research: toxinology and immunology. In this article, I highlight how such dichotomy between these two fields led to a biased, or even erroneous view of the ecology and evolution of the interaction between insects, toxins, and bacteria. I focus on the reason behind such a dichotomy, on how to bridge the fields together, and on confounding effects that could bias the outcome...
Tipo: Text
Palavras-chave: Invertebrate immunity; Host-pathogens interaction; Toxins; Bacillus thuringiensis; Resistance.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00457/56834/78950.pdf

Immune priming and portal of entry effectors improve response to vibrio infection in a resistant population of the European abalone
Provedor de dados: 5
Autores: Dubief, Bruno; Nunes, Flavia; Basuyaux, Olivier; Paillard, Christine.
Since 1997, populations of the European abalone Haliotis tuberculata suffer mass mortalities attributed to the bacterium Vibrio harveyi. These mortalities occur at the spawning season, when the abalone immune system is depressed, and when temperatures exceed 17 °C, leading to favorable conditions for V. harveyi proliferation. In order to identify mechanisms of disease resistance, experimental successive infections were carried out on two geographically distinct populations: one that has suffered recurrent mortalities (Saint-Malo) and one that has not been impacted by the disease (Molène). Furthermore, abalone surviving these two successive bacterial challenges and uninfected abalone were used for several post-infection analyses. The Saint-Malo population...
Tipo: Text
Palavras-chave: Immunity; Hemocyte; Abalone; Disease; Extracellular products; Immune priming; Vibrio harveyi; Flow cytometry; Resistance; Phagocytosis; Bacterial growth; QPCR; Gill.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00357/46800/46667.pdf

Entangled effects of allelic and clonal (genotypic) richness in the resistance and resilience of experimental populations of the seagrass Zostera noltii to diatom invasion
Provedor de dados: 5
Autores: Massa, Sonia I.; Paulino, Cristina M.; Serrao, Ester A.; Duarte, Carlos M.; Arnaud-haond, Sophie.
Background: The relationship between species diversity and components of ecosystem stability has been extensively studied, whilst the influence of the genetic component of biodiversity remains poorly understood. Here we manipulated both genotypic and allelic richness of the seagrass Zostera noltii, in order to explore their respective influences on the resistance of the experimental population to stress. Thus far intra-specific diversity was seldom taken into account in management plans, and restoration actions showed very low success. Information is therefore needed to understand the factors affecting resistance and resilience of populations.  Results: Our results show a positive influence of both allelic and genotypic richness on the resistance of...
Tipo: Text
Palavras-chave: Allelic richness; Genotypic richness; Resistance; Resilience; Zostera noltii; Biotic stress; Seagrass.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00166/27748/25946.pdf

Study on the susceptibility of Enterococcus faecalis from infectious processes to ciprofloxacin and vancomycin
Provedor de dados: 80
Autores: Genaro,A.; Cunha,M. L. R. S.; Lopes,C. A. M.
Enterococcus faecalis is considered a pathogen responsible for hospital infections and, due to its frequent multi-resistant profile, has caused preoccupations among many medical authorities. The objective of this study was to determine the antimicrobial susceptibility of 74 strains isolated from blood cultures and purulent secretions to vancomycin and ciprofloxacin through the Minimum Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC) by using the Microdilution test. The results showed a greater efficacy of vancomycin compared to ciprofloxacin (98.6% of the strains were inhibited by vancomycin at lower concentrations: 0.06 - 1 µg/ml). However, in the MBC analysis 73% of the strains showed a MBC of vancomycin only at high...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Enterococcus faecalis; Vancomycin; Ciprofloxacin; Resistance; Spontaneous mutation.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992005000300004

Influence of host resistance and insecticide seed treatments on curly top in sugar beets
Provedor de dados: 18
Autores: Strausbaugh, C.A.; Gillen, A.M.
Tipo: Article
Palavras-chave: Resistance; Curly top; Insecticide.
Ano: 2006
URL: http://eprints.nwisrl.ars.usda.gov/41/1/1191.pdf

Beet curly top resistance in USDA-ARS plant introduction lines, 2014.
Provedor de dados: 18
Autores: Strausbaugh, C.A.; Panella, Leonard W.
Curly top caused by Beet curly top virus (BCTV) is a widespread disease problem vectored by the beet leafhopper in semiarid sugar beet production areas. Host resistance is the primary defense against this problem, but resistance in commercial cultivars is only low to intermediate. In order to identify novel sources of curly top resistance, twenty-four plant introduction (PI) lines were screened in a disease nursery in 2014. The lines were arranged in a randomized complete block design with three replications.  A curly top epiphytotic was created by releasing approximately 6 viruliferous beet leafhoppers per plant at the four- to six-leaf growth stage on 23 Jun. Foliar symptoms were evaluated on 16 Jul using a scale of 0-9 (0 = healthy and 9 = dead) in a...
Tipo: Article
Palavras-chave: Curly top; Resistance; Verticillium wilt.
Ano: 2015
URL: http://eprints.nwisrl.ars.usda.gov/1588/1/1546.pdf

Evaluation of fungicide and biological treatments for control of fungal storage rots in sugar beet, 2014
Provedor de dados: 18
Autores: Strausbaugh, C.A.; Olsen L, Nora; Frazier J, Mary; Wambolt, C.
Preventing sucrose losses in storage is important to the economic viability of the sugar beet industry.  In an effort to establish additional measures for reducing sucrose losses in storage, ten fungicide and/or biological treatments were evaluated on sugar beet roots in a commercial sugar beet storage building for their ability to limit fungal growth on roots harvested 2 Oct.  Six of the treatments were applied as a direct spray to roots, but two treatments were applied as a cold fog and two others were applied as a thermal fog.  The treated eight-beet root samples were arranged in a randomized complete block design with 6 replications on top of the commercial sugar beet pile inside a storage building.  Roots were evaluated for fungal growth, root rot,...
Tipo: Article
Palavras-chave: Resistance; Storage; Sugarbeet.
Ano: 2015
URL: http://eprints.nwisrl.ars.usda.gov/1603/1/1561.pdf

Sugar beet germplasm evaluated for rhizomania and storage rot resistance in Idaho, 2011.
Provedor de dados: 18
Autores: Strausbaugh, C.A.; Panella, Leonard W.
Rhizomania caused by the Beet necrotic yellow vein virus (BNYVV) is a worldwide problem that can lead to loss of tonnage and lower percent sucrose in the field.  BNYVV can also reduce the storability of roots.  To identify germplasm with resistance to these problems, 14 sugarbeet germplasm lines developed by the USDA-ARS Ft. Collins sugarbeet program were screened in a field experiment arranged in a randomized complete block design with 5 replications.  During the growing season plants were evaluated for foliar rhizomania symptoms.  At harvest on 29 September, roots were evaluated for rhizomania symptoms and then placed into an indoor commercial sugarbeet storage building in Paul, ID.  Foliar symptoms ranged from 0% for one of the resistant checks to 99%...
Tipo: Article
Palavras-chave: Resistance; Rhizomania; Root rots; Sugarbeet.
Ano: 2012
URL: http://eprints.nwisrl.ars.usda.gov/1466/1/1431.pdf

Resistance to Beet curly top in USDA-ARS Ft. Collins germplasm, 2015
Provedor de dados: 18
Autores: Panella, Leonard W.; Strausbaugh, C.A.
Fifty sugar beet (Beta vulgaris L.) germplasm lines produced by the USDA-ARS Ft. Collins sugar beet program and two commercial check cultivars [SV2012RR (susceptible) and HM PM90 (resistant)] were screened for resistance to Beet curly top virus (BCTV).  The curly top evaluation was conducted at the USDA-ARS North Farm in Kimberly, ID, which had been in barley in 2014.  The germplasm was planted (density of 142,560 seeds/A) on May 27.  The plots were two rows 10 ft long with 22-in row spacing and arranged in a randomized complete block design with three replications.  The fields were sprinkler irrigated, cultivated, and hand weeded as necessary.  Plant populations were thinned on June 20  Plants were inoculated at the four- to six-leaf growth stage on June...
Tipo: Article
Palavras-chave: Curly top; Resistance; Sugarbeet.
Ano: 2016
URL: http://eprints.nwisrl.ars.usda.gov/1617/1/1574.pdf

Ft. Collins sugar beet germplasm evaluated for rhizomania and storage rot resistance in Idaho, 2015
Provedor de dados: 18
Autores: Panella, Leonard W.; Strausbaugh, C.A.
Fifty-seven sugar beet (Beta vulgaris L.) lines from the USDA-ARS Ft. Collins sugar beet program and four check cultivars were screened for resistance to Beet necrotic yellow vein virus (BNYVV), the causal agent of rhizomania, and storage rot.  The rhizomania evaluation was conducted at the USDA-ARS North Farm in Kimberly, ID.  Seed of the sugar beet germplasm lines was planted on April 21.  One-row plots, 10 ft long with 22-in row spacing between rows were arranged in a randomized complete block design with 4 replications. The trial relied on natural infection for rhizomania and storage rot development.  The plots were rated for foliar symptom (percentage of plants with yellow, stunted, upright leaves) development on July 8 and 20.  At harvest, roots in...
Tipo: Article
Palavras-chave: Resistance; Rhizomania; Storage; Sugarbeet.
Ano: 2016
URL: http://eprints.nwisrl.ars.usda.gov/1628/1/1585.pdf

Experimental sugar beet cultivars evaluated for rhizomania resistance and storability in Idaho, 2015
Provedor de dados: 18
Autores: Strausbaugh, C.A.; Wambolt, C.
Rhizomania caused by Beet necrotic yellow vein virus (BNYVV) and storage losses are serious sugar beet production problems.  To identify sugar beet cultivars with resistance to BNYVV and evaluate storability, 32 commercial cultivars were screened by growing them in a sugar beet field infested with BNYVV in Kimberly, ID during the 2015 growing season in a randomized complete block design with 6 replications.  At harvest on 28-29 September 2015, roots were dug and evaluated for symptoms of rhizomania and also placed in an indoor commercial sugar beet storage building.  After 136 days in storage, samples were evaluated for surface rot, weight loss, and sucrose loss.  Surface root rot ranged from 8 to 81%, weight loss ranged from 8.0 to 21.0%, sucrose losses...
Tipo: Article
Palavras-chave: Resistance; Rhizomania; Storage; Sugarbeet.
Ano: 2016
URL: http://eprints.nwisrl.ars.usda.gov/1627/1/1584.pdf

Registration of sugar beet doubled haploid line KDH13 with resistance to beet curly top
Provedor de dados: 18
Autores: Eujayl, Imad A.; Strausbaugh, C.A.; Chunsheng, Lu.
KDH13 is a sugar beet (Beta vulgaris L. ssp vulgaris) doubled haploid line (PI 663862) released as a genetic stock by USDA-ARS in cooperation with the Beet Sugar Development Foundation, Denver, CO. KDH13 is resistant to beet curly top (BCT) caused by Beet curly top virus which is transmitted by the beet leafhopper (Circulifer tenellus Baker). KDH13 was extracted from the BCT resistant C762-17 (PI 560130) parental line that segregates for BCT resistance and genetic male sterility. Intensive phenotypic screening was used for selecting plants from C762-17 that showed no symptoms under fully controlled infection conditions in the greenhouse. Seed from a single plant was used as a donor of floral buds for isolation of unfertilized ovaries to regenerate KDH13...
Tipo: Article
Palavras-chave: Curly top; Genetics; Resistance; Sugarbeet.
Ano: 2016
URL: http://eprints.nwisrl.ars.usda.gov/1608/1/1566.pdf

Experimental sugar beet cultivars evaluated for rhizomania resistance and storability in Idaho, 2014
Provedor de dados: 18
Autores: Strausbaugh, C.A.; Eujayl, Imad A.; Wambolt, C.
Rhizomania caused by Beet necrotic yellow vein virus (BNYVV) and storage losses are serious sugar beet production problems.  To identify sugar beet cultivars with resistance to BNYVV and evaluate storability, 30 experimental cultivars were screened by growing them in a sugar beet field infested with BNYVV in Kimberly, ID during the 2014 growing season in a randomized complete block design with 6 replications.  At harvest on 24-25 September 2014, roots were dug and evaluated for symptoms of rhizomania and also placed in an indoor commercial sugar beet storage building.  After 138 days in storage, samples were evaluated for surface rot, weight loss, and sucrose loss.  Surface root rot ranged from 6 to 82%, weight loss ranged from 9.1 to 17.5%, sucrose losses...
Tipo: Article
Palavras-chave: Resistance; Rhizomania; Sugarbeet.
Ano: 2015
URL: http://eprints.nwisrl.ars.usda.gov/1601/1/1559.pdf

Evaluation of experimental sugar beet hybrids for resistance to curly top in Malheur County, OR, 2005
Provedor de dados: 18
Autores: Strausbaugh, C.A.; Gillen, A.M.
Twenty-five experimental sugarbeet hybrids submitted to the official variety trials were evaluated for resistance to Beet curly top virus (BCTV).  Hybrids were planted in a commercial sprinkler-irrigated sugarbeet field and exposed to a natural epiphytotic of BCTV.  Experimental units were arranged in a randomized complete block design with seven replications.  Plots were evaluated for BCTV based on a Disease Index (DI) scale of 0 to 9 (no symptoms to dead) on Sept 14, 2004 by three raters.  The moderately severe epiphytotic resulted in uniform disease pressure and significant differences between hybrids for DI, root yield, sugar content, and estimated recoverable sugar.  Our disease ratings were positively correlated with (r = 0.632, P &lt; 0.0001)...
Tipo: Article
Palavras-chave: Resistance; Curly top.
Ano: 2006
URL: http://eprints.nwisrl.ars.usda.gov/1221/1/1193.pdf

Evaluation of commercial sugarbeet hybrids for resistance to beet curly top in Canyon County, ID, 2004
Provedor de dados: 18
Autores: Camp, S.; Foote, P.; Strausbaugh, C.A.; Gillen, A.M.
Tipo: Article
Palavras-chave: Resistance; Curly top.
Ano: 2005
URL: http://eprints.nwisrl.ars.usda.gov/1214/1/1151.pdf

Evaluation of experimental sugarbeet hybrids for resistance to beet curly top in Canyon County, ID, 2004
Provedor de dados: 18
Autores: Strausbaugh, C.A.; Gillen, A.M.; Camp, S.; Foote, P.
Tipo: Article
Palavras-chave: Resistance; Curly top.
Ano: 2005
URL: http://eprints.nwisrl.ars.usda.gov/1215/1/1152.pdf

Evaluation of commercial sugar beet hybrids for resistance to curly top in Malheur County, OR, 2005
Provedor de dados: 18
Autores: Strausbaugh, C.A.; Gillen, A.M.
Commercial sugar beet hybrids were evaluated for resistance to Beet severe curly top virus in a furrow-irrigated sugar  beet field near Ontario, OR where curly top had been a problem in previous years. The field trial relied on natural infection  and was planted on 6 Apr. Plots were planted to a density of 285,120 seeds/A, and thinned to 40,731 plants/A. Plots were  four rows wide (22 in. between rows) and 23 ft long. The experimental design was a randomized complete block with eight  replications. The crop was managed according to standard cultural practices. The weather during the growing season was  normal except for above average temperatures in Mar and Aug and above average precipitation in Apr and May. Disease  pressure was uniform and moderately...
Tipo: Article
Palavras-chave: Resistance; Curly top.
Ano: 2006
URL: http://eprints.nwisrl.ars.usda.gov/1222/1/1194.pdf

Beet curly top resistance in USDA-ARS Kimberly germplasm lines, 2015
Provedor de dados: 18
Autores: Strausbaugh, C.A.; Eujayl, I.A.
Curly top caused by Beet curly top virus is a widespread disease problem vectored by the beet leafhopper in semiarid sugar beet production areas.  Host resistance is the primary defense against this problem, but resistance in commercial cultivars is only low to intermediate.  In order to identify novel sources of curly top resistance, 14 sugar beet lines were screened in a disease nursery in 2015.  The lines were arranged in a randomized complete block design with six replications.  A curly top epiphytotic was created by releasing six viruliferous beet leafhoppers per plant at the four-to six-leaf growth stage on 24 Jun.  Foliar symptoms were evaluated on 13 and 20 Jul using a scale of 0-9 (0 = healthy and 9 = dead) in a continuous manner.  Curly top...
Tipo: Article
Palavras-chave: Curly top; Resistance; Sugarbeet.
Ano: 2016
URL: http://eprints.nwisrl.ars.usda.gov/1616/1/1573.pdf

Beet curly top resistance in USDA-ARS Ft. Collins Germplasm, 2011
Provedor de dados: 18
Autores: Panella, Leonard W.; Strausbaugh, C.A.
Twenty-two sugar beet (Beta vulgaris L.) lines from the USDA-ARS Ft. Collins sugar beet program were screened for resistance to Beet severe curly top virus (BSCTV) and other closely related Curtovirus species in 2011. Commercial cultivars Monohikari and HM PM90 were included as susceptible and resistant checks, respectively. The curly top evaluation was conducted at the USDA-ARS North Farm in Kimberly, ID which has Portneuf silt loam soil and had been in barley in 2010. The field was plowed both in the fall and the spring, fertilized (80 lb N and 120 lb P2O5/A) on 20 Apr 11, sprayed with Ethotron (2 pt/A), and roller harrowed. The germplasm was planted (density of 142,560 seeds/A) on 16 May. The plots consisted of two rows 10 ft long with 22-in row...
Tipo: Article
Palavras-chave: Curly top; Resistance; Sugarbeet.
Ano: 2012
URL: http://eprints.nwisrl.ars.usda.gov/1492/1/1456.pdf

USDA-ARS sugar beet germplasm developed in Salinas, CA, evaluated for rhizomania resistance in Idaho
Provedor de dados: 18
Autores: Gillen, A.M.; Strausbaugh, C.A.; Gallian, J.
Thirty-one sugar beet germplasm breeding lines and releases produced by the USDA-ARS sugarbeet  program at Salinas, CA, and one line from the USDA-ARS sugarbeet program at East Lansing, MI, were  evaluated for resistance to rhizomania under south-central Idaho conditions at Twin Falls, ID. The field had been  identified as having Beet necrotic yellow vein virus (BNYVV), which overcomes resistance conditioned by the  Rzl gene. Single-row plots 10 ft long with 22-in. spacing were planted on 23 May 05. Plants were thinned to 4 to  6-in. spacing in mid-Jun. The materials were predominantly multigerm; they were hand thinned to single plants  during the first week of Jul. The trial layout was a randomized complete block with eight replicates, however, the...
Tipo: Article
Palavras-chave: Resistance; Rhizomania.
Ano: 2007
URL: http://eprints.nwisrl.ars.usda.gov/1226/1/1207.pdf

sugar beet germplasm evaluated for resistance to rhizomania and fungal growth in storage in Idaho, 2011.
Provedor de dados: 18
Autores: Eujayl, Imad A.; Strausbaugh, C.A.
Resistance to rhizomania is a basic requirement for cultivars’ approval for commercialization. The objectives of this research were to identify germplasm accessions that carry resistance genes to rhizomania and storage root rots. Twenty-one sugar beet (Beta vulgaris L.) germplasm from the USDA-ARS Kimberly sugar beet program and four check cultivars were screened for resistance to Beet necrotic yellow vein virus (BNYVV) during the 2011 growing season and during the 2011/2012 storage period for fungal growth in an indoor storage.  The rhizomania evaluation was conducted at the rhizomania nursery in the USDA-ARS North Farm in Kimberly, ID.  The crop was managed according to standard cultural practices and pest control.  The plots were rated twice (4 weeks...
Tipo: Article
Palavras-chave: Resistance; Rhizomania; Sugarbeet; Fungi.
Ano: 2012
URL: http://eprints.nwisrl.ars.usda.gov/1465/1/1430.pdf

Strausbaugh, C.A., Panella, L.W. 2016. Beet curly top resistance in USDA-ARS plant introduction lines, 2015
Provedor de dados: 18
Autores: Strausbaugh, C.A.; Panella, Leonard W.
Curly top caused by Beet curly top virus (BCTV) is a widespread disease problem vectored by the beet leafhopper in semiarid sugar beet production areas.  Host resistance is the primary defense against this problem, but resistance in commercial cultivars is only low to intermediate.  In order to identify novel sources of curly top resistance, thirty-one Plant Introduction (PI) Lines were screened in a disease nursery in 2015.  The lines were arranged in a randomized complete block design with three replications.  A curly top epiphytotic was created by releasing approximately 6 viruliferous beet leafhoppers per plant at the four- to six-leaf growth stage on 24 Jun.  Foliar symptoms were evaluated on 13 and 20 Jul using a scale of 0-9 (0 = healthy and 9 =...
Tipo: Article
Palavras-chave: Curly top; Resistance; Sugarbeet.
Ano: 2016
URL: http://eprints.nwisrl.ars.usda.gov/1615/1/1572.pdf

Commercial sugar beet cultivars evaluated for rhizomania resistance and storability in Idaho, 2014
Provedor de dados: 18
Autores: Strausbaugh, C.A.; Eujayl, Imad A.; Wambolt, C.
Rhizomania caused by Beet necrotic yellow vein virus (BNYVV) and storage losses are serious sugar beet production problems.  To identify sugar beet cultivars with resistance to BNYVV and evaluate storability, 33 commercial cultivars were screened by growing them in a sugar beet field infested with BNYVV in Kimberly, ID during the 2014 growing season in a randomized complete block design with 6 replications.  At harvest on 24-25 September 2014, roots were dug and evaluated for symptoms of rhizomania and also placed in an indoor commercial sugar beet storage building.  After 138 days in storage, samples were evaluated for surface rot, weight loss, and sucrose loss.  Surface root rot ranged from 7 to 82%, weight loss ranged from 9.4 to 19.1%, sucrose losses...
Tipo: Article
Palavras-chave: Resistance; Rhizomania; Sugarbeet.
Ano: 2015
URL: http://eprints.nwisrl.ars.usda.gov/1602/1/1560.pdf

Flight activity of Sitophilus oryzae (L) and Sitophilus zeamais Motsch (Coleoptera: Curculionidae) and its relationship with susceptibility to insecticides
Provedor de dados: 82
Autores: Vásquez-Castro,Javier A; Baptista,Gilberto C De; Trevizan,Luiz R P; Gadanha Jr,Casimiro D.
Insect-pest mobility can influence insect susceptibility to the insecticides used to control them. The objective of this work was to evaluate the flight activity of Sitophilus oryzae (L) and Sitophilus zeamais Motsch populations reared on corn and wheat grains, and its relationship with insecticide susceptibility. Unsexed adult insects with ages between 10 and 20 days were placed on a plastic tray. A 40-watt incandescent light bulb was positioned at a 50 cm height relative to the tray. Flight activity was evaluated during 30 min. In the LC50 estimation bioassays, the insects were exposed to dry residues of the organophosphorus insecticide fenitrothion and of the pyrethroid insecticide esfenvalerate on the internal surface of glass vials. Mortality was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stored grain; Chemical control; Tolerance; Resistance; Gene flow.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2009000300017

Effect of silicon applied to wheat plants on the biology and probing behaviour of the greenbug Schizaphis graminum (Rond.) (Hemiptera: Aphididae)
Provedor de dados: 82
Autores: Goussain,Marcio M.; Prado,Ernesto; Moraes,Jair C.
The effect of silicon-treated wheat plants (Triticum aestivum L.) on the greenbug, Schizaphis graminum (Rond.) (Hemiptera: Aphididae) was evaluated. Plants were treated with silicon incorporated to the soil and by foliar spraying. Aphid development was evaluated by observing the duration of the pre-reproductive, reproductive and post-reproductive periods, as well as fecundity and longevity. Probing behaviour was investigated by using the DC electrical penetration graphs (EPG) technique and a "honeydew clock". Silica treated plants had a clear adverse effect on aphid development. Stylet penetration was not affected by treatments showing no physical barriers by the plant tissue. However, stylet was withdrawn more often on plants treated with silica,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Resistance; Honeydew; Biology; EPG.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2005000500013

Emergence of multi-acaricide resistant Rhipicephalus ticks and its implication on chemical tick control in Uganda
Provedor de dados: 19
Autores: Vudriko, Patric; Okwee-Acai, James; Tayebwa, Dickson Stuart; Byaruhanga, Joseph; Kakooza, Steven; Wampande, Edward; Omara, Robert; Muhindo, Jeanne Bukeka; Tweyongyere, Robert; Owiny, David Okello; Hatta, Takeshi; Tsuji, Naotoshi; Umemiya-Shirafuji, Rika; Xuan, Xuenan; Kanameda, Masaharu; Fujisaki, Kozo; Suzuki, Hiroshi.
Background: Acaricide failure has been on the rise in the western and central cattle corridor of Uganda. In this study, we identified the tick species associated with acaricide failure and determined their susceptibility to various acaricide molecules used for tick control in Uganda. Methods: In this cross sectional study, tick samples were collected and identified to species level from 54 purposively selected farms (from 17 districts) that mostly had a history of acaricide failure. Larval packet test was used to screen 31 tick populations from 30 farms for susceptibility at discriminating dose (DD) and 2 x DD of five panels of commercial acaricide molecules belonging to the following classes; amidine, synthetic pyrethroid (SP), organophosphate (OP) and...
Palavras-chave: Ticks; Rhipicephalus appendiculatus; Rhipicephalus (Boophilus) decoloratus; Acaricide; Resistance; Amitraz; Synthetic pyrethroids; Organophosphates.
Ano: 2016
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4437

Chloroquine resistance status a decade after : Re-emergence of sensitive Plasmodium falciparum strains in malaria endemic and epidemic areas in Kenya
Provedor de dados: 19
Autores: Wangai, L.N; Kimani, F.T; Omar, S.A; Karanja, S.M; Nderu, D.W; Magoma, G; Mutua, D.
Development and spread of chloroquine (CQ) resistance led to its withdrawal in most malaria endemic countries. In Kenya, this occurred in 1998 when clinical efficacy dropped below 50%. Less than a decade after CQ was removed from routine use in Malawi, the drug has reversed to activity and is again effective for first-line treatment of uncomplicated malaria. There is a probability of a similar reversed activity in Kenya for more 10 years of its absence in uncomplicated Plasmodium falciparum malaria treatment. The present study was aimed at establishing the CQ resistance status in the country, 10 years after its withdrawal, by looking at high malaria transmission zone, Mbita, a malaria endemic area and some malaria epidemic areas of the Kenyan highlands....
Palavras-chave: Plasmodium falciparum; Chloroquine (CQ); Resistance; Endemic; Epidemic.
Ano: 2011
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3096

Application of Anaerobically Digested Dairy Slurry: effectiveness of perforated injector disk
Provedor de dados: 19
Autores: Kishimoto, Tadashi; Tani, Masayuki; Umetsu, Kazutaka; Nishizaki, Kunio; 岸本, 正; 谷, 昌幸; 梅津, 一孝; 西崎, 邦夫.
2004年8月5日とかちプラザで開催､日本ユネスコ国内委員会主催の帯広農村開発教育国際セミナー(OASERD)国際連合ユネスコアジア太平洋地域教育開発計画事業(APEID)シンポジウム「地球にやさしい農業をめざして : 家畜ふん尿，資源としての有効利用」講演資料
Palavras-chave: Spreader; Injector; Motion resistance; Resistance; Soil compaction; Biogas plant.
Ano: 2004
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/1902

Mapping a QTL conferring resistance to Fusarium head blight on chromosome 1B in winter wheat (Triticum aestivum L.)
Provedor de dados: 19
Autores: Nishio, Zenta; Orme, Chihiro; Ito, Miwako; Tabiki, Tadashi; Nagasawa, Koichi; Miura, Hideho.
Fusarium head blight (FHB) is one of the most devastating diseases of wheat (Triticum aestivum L.), and the development of cultivars with FHB resistance is the most effective way to control the disease. Yumechikara is a Japanese hard red winter wheat cultivar that shows moderate resistance to FHB with superior bread-making quality. To identify quantitative trait loci (QTLs) for FHB resistance in Yumechikara, we evaluated doubled haploid lines derived from a cross between Yumechikara and a moderate susceptible cultivar, Kitahonami, for FHB resistance in a 5-year field trial, and we analyzed polymorphic molecular markers between the parents. Our analysis of these markers identified two FHB-resistance QTLs, one from Yumechikara and one from Kitahonami. The...
Palavras-chave: Fusarium head blight; Wheat; Resistance; Quantitative trait loci.
Ano: 2016
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4454

Use of potassium silicate for powdery mildew control in Eucalyptus benthamii seedlings
Provedor de dados: 190
Autores: Schultz, Bruno; Bora, Karen Christiane; Nogueira, Antonio Carlos; Auer, Celso Garcia.
Avaliou-se a efetividade do silicato de potássio (K2SiO3) no controle de oídio em mudas de Eucalyptus benthamii. Quatro tratamentos foram testados: pulverização de K2SiO3 (4 mL L-1) por 7 dias, pulverização de K2SiO3 (4 mL L-1) por 14 dias, pulverização do fungicida epoxiconazole + piraclostrobina (6 mL L-1) por 14 dias e pulverização de água ultrapurificada por 7 dias. Dez mudas com 90 dias de idade foram utilizadas por parcela em três blocos ao acaso. A inoculação foi feita pincelando-se esporos de Oidium eucalypti, retirados de mudas de E. benthamii já infectadas, sobre aspartes superiores de mudas sadias. Aos 150 dias, avaliou-se a severidade da doença e determinou-se a massa fresca (MF) e a massa seca (MS) da parte aérea. Mediu-se o diâmetro do coleto...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Silício; Resistência; Oidium eucalypti Silicon; Resistance; Oidium eucalypti.
Ano: 2012
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/286

Physical, chemical and mechanical properties of Australian cedar wood cultivated in Corupá, Santa Catarina State, Brazil
Provedor de dados: 190
Autores: Trianoski, Rosilani; Matos, Jorge Luis Monteiro de; Iwakiri, Setsuo.
The Australian cedar (Toona ciliata M. Roem) is a species of high commercial value, with characteristics similar to native mahogany and cedar, which has been highlighted in forest plantations in Brazil, whose wood should be the subject of technological research. The objective of this study was to evaluate the physical, chemical and mechanical properties from planted stands of 18 years old. The wood showed low density (0.330 g cm3), low average dimensional stability (anisotropy: 2.22), high content of extractives (10.33%) and moderate mechanical properties: MOR and MOE to bending: 498 kgf cm-2 and 66,163 kgf cm-2; MOR and MOE for parallel compression: 258 kgf cm-2 and 100.813 kgf cm-2; shear: 82 kgf cm-2 and medium hardness: 208 kgf.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Exotic species; Resistance; Dimensional stability; Extractives; Toona ciliata Tecnologia e utilização de Produtos Florestais - Propriedades da madeira Espécie exótica; Resistência; Estabilidade dimensional; Extrativos; Toona ciliata.
Ano: 2014
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/523

Phenotypic diversity and carcass quality of creole goats with genetic potential for resistance to infection caused by worm
Provedor de dados: 86
Autores: Neri,Vanessa dos Santos; Sarmento,José Lindenberg Rocha; Borges,Laylson da Silva; Torres,Tatiana Saraiva; Sena,Luciano Silva; Oliveira,Max Brandão de; Sousa Júnior,Antônio de.
Abstract: The objective of this work was to phenotypically characterize creole goats of the Moxotó, Azul, Canindé, Repartida, Marota, and Graúna breeds, comparing them with the Boer, Anglo Nubian, and Alpine exotic breeds, to identify the genetic groups of greater potential for carcass quality and resistance to infection caused by worm. Data on morphometric measurements were obtained for the count of worm eggs in grams of feces (WEGF), Famacha score, carcass measurements, and body weight from 308 animals, in a farm in the state of Piauí, Brazil. Repartida goats showed the highest average for wither height (61.55 cm) and rump height (62.16 cm), and Moxotó goats had the greatest ear length (13.45 cm). The Moxotó breed showed the highest means for carcass and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carcass traits; Genetic resources; Morphometry; Resistance.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000700849

Sequence similarity between the viral cp gene and the transgene in transgenic papayas
Provedor de dados: 86
Autores: Souza Júnior,Manoel Teixeira; Gonsalves,Dennis.
The Papaya ringspot virus (PRSV) coat protein transgene present in 'Rainbow' and 'SunUp' papayas disclose high sequence similarity (&gt;89%) to the cp gene from PRSV BR and TH. Despite this, both isolates are able to break down the resistance in 'Rainbow', while only the latter is able to do so in 'SunUp'. The objective of this work was to evaluate the degree of sequence similarity between the cp gene in the challenge isolate and the cp transgene in transgenic papayas resistant to PRSV. The production of a hybrid virus containing the genome backbone of PRSV HA up to the Apa I site in the NIb gene, and downstream from there, the sequence of PRSV TH was undertaken. This hybrid virus, PRSV HA/TH, was obtained and used to challenge 'Rainbow', 'SunUp', and an...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carica papaya; Potyvirus; Resistance; Breeding; Virus.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2005000500009

Inheritance pattern and selection criteria for resistance to soybean cyst nematode races 3 and 9
Provedor de dados: 86
Autores: Cervigni,Gerardo Domingo Lucio; Schuster,Ivan; Sediyama,Carlos Sigueyuki; Barros,Everaldo Gonçalves de; Moreira,Maurilio Alves.
The objective of this work was to determine soybean resistance inheritance to Heterodera glycines Ichinohe (soybean cyst nematode - SCN) races 3 and 9, as well as to evaluate the efficiency of direct and indirect selection in a soybean population of 112 recombinant inbred lines (RIL) derived from the resistant cultivar Hartwig. The experiment was conducted in a completely randomized design, in Londrina, PR, Brazil. The estimated narrow-sense heritabilities for resistance to races 3 and 9 were 80.67 and 77.97%. The genetic correlation coefficient (r g = 0.17; p&lt;0.01) shows that some genetic components of resistance to these two races are inherited together. The greatest genetic gain by indirect selection was obtained to race 9, selecting to race 3 due to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Heterodera glycines; Resistance; SCN; Recombinant inbred lines.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2007001000007

Higher glandular trichome density in tomato leaflets and repellence to spider mites
Provedor de dados: 86
Autores: Maluf,Wilson Roberto; Inoue,Irene Fumi; Ferreira,Raphael de Paula Duarte; Gomes,Luiz Antonio Augusto; Castro,Evaristo Mauro de; Cardoso,Maria das Graças.
The objective of this work was to evaluate the feasibility of selection for higher glandular trichome densities, as an indirect criterion of selection for increasing repellence to spider mites Tetranychus urticae, in tomato populations derived from an interspecific cross between Lycopersicon esculentum x L. hirsutum var. glabratum PI 134417. Trichome densities were evaluated in 19 genotypes, including 12 from advanced backcross populations, derived from the original cross L. esculentum x L. hirsutum var. glabratum PI 134417. Counts were made both on the adaxial and abaxial leaf surfaces, and trichomes were classified into glandular types IV and VI, other glandular types (types I+VII), and nonglandular types. Mite repellence was measured by distances walked...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lycopersicon hirsutum; Tetranychus urticae; 2-tridecanone; Methyl-ketone; Resistance.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2007000900003

Reaction of lettuce genotypes to Lettuce mosaic virus-Most (LMV-Most) and characterization of the translation factor eIF4E
Provedor de dados: 86
Autores: Moura,Mônika Fecury; Silva,Norberto da; Hoffmann,Maria Isabel Motta; Pavan,Marcelo Agenor; Krause-Sakate,Renate.
Abstract: The objective of this work was to evaluate lettuce genotypes for their reaction to Lettuce mosaic virus (LMV; Most-type, isolate AF-199) and variations of the eukaryotic translation initiation factor eIF4E. All inoculated genotypes were susceptible to LMV, which was detected by RT-PCR using specific primer pairs. However, the accessions 169501, 169501C, 172918A, and 162499 showed late development of symptoms that appeared only on the inoculated leaves. Sequencing of the coding region of eIF4E showed that these genotypes have an eIF4E0 (mol  0 ) standard typical for their susceptibility to LMV, indicating that the phenotype found is not correlated to nucleotide variations in this translation factor.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: EIF4E; Potyvirus; Resistance.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000100125

Reaction of arracacha genotypes to the root soft rot caused by Pectobacterium chrysanthemi
Provedor de dados: 86
Autores: Henz,Gilmar Paulo; Reifschneider,Francisco José Becker; Santos,Fausto Francisco dos.
The purpose of this paper was to screen thirty-two arracacha genotypes for their reaction to root soft rot. Twenty roots of each genotype were inoculated with two Pectobacterium chrysanthemi isolates in a randomized experiment (10 roots/isolate). After inoculation, roots were individually wrapped with PVC film and kept at 26ºC in closed plastic bags. Soft rot lesions were recorded after 36 hours and genotypes were grouped in four classes of susceptibility by cluster analysis: 10 were less susceptible, 16 intermediate, 3 susceptible and 3 very susceptible. All the tested arracacha genotypes showed only variation in the degree of susceptibility.
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Arracacia xanthorrhiza; Peruvian carrot; Resistance; Disease.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2005000100014

Control of ALS- and EPSPS-Resistant Amaranthus palmeri by Alternative Herbicides Applied in PRE- and POST-Emergence
Provedor de dados: 87
Autores: GONÇALVES NETTO,A.; NICOLAI,M.; CARVALHO,S.J.P.; MALARDO,M.R.; LÓPEZ-OVEJERO,R.F.; CHRISTOFFOLETI,P.J.
ABSTRACT: The emergence of resistant biotypes of the Amaranthus palmeri species in cotton production areas of the state of Mato Grosso, Brazil, generated the need for correct identification of this species and information on viable herbicidal tools for their management. Thus, greenhouse experiments were conducted to evaluate the efficacy of alternative herbicides applied to A. palmeri in pre and post emergence. A randomized block design with four replications was used. The efficacy of herbicides applied in pre emergence was evaluate in two experiments, one in a clayey and other in a sandy soil; 9 herbicide treatments (8 with herbicide application and a control without application) were applied on each soil. Subsequently, two experiments with different...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caruru; Weed control; Resistance; Phenology; Soil texture.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100193

Glyphosate Applied at the Early Reproductive Stage Impairs Seed Production of Glyphosate-Resistant Hairy Fleabane
Provedor de dados: 87
Autores: PIASECKI,C.; MAZON,A.S.; MONGE,A.; CAVALCANTE,J.A.; AGOSTINETTO,D.; VARGAS,L.
ABSTRACT: Glyphosate-resistant hairy fleabane [Conyza bonariensis (L.) Cronq.] is one of the most important weeds in the world. Among the factors that make this weed species widely distributed in the most diverse environments is the high seed production capacity and dispersal. Hairy fleabane plants not controlled by herbicide application regrowth and overcome crop canopy, use environmental resources, interfere with crops, and complete their life cycle by producing thousands of seeds and replenishing the seed bank. Management strategies that reduce production and viability of hairy fleabane seeds can be adopted within the integrated management to reduce the seed bank and prevent further infestations. In this way, experiments were carried out in a greenhouse...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conyza bonariensis; Resistance; Integrated weed management; Prevention; Soil seed bank.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100198

Rapid Detection of Horseweed and Black Picker Sensitivity Levels to Saflufenacil
Provedor de dados: 87
Autores: VARGAS,L.; HENCKES,J.R.; GAVA,F.; AGOSTINETTO,D.; CARVALHO,I.R.; RAMOS,R.; RODRIGUES,R.
ABSTRACT: Resistance to herbicides is one of the main factors responsible for weed control failures. Once uncontrolled and stressed, resistant weeds demand a new application of herbicides from different modes of action, which results in higher monetary costs and environmental impact. Knowledge of weed sensitivity levels to herbicides before making decisions for their management in the field is paramount to increasing the efficiency of integrated weed management. Thus, methods that allow the rapid determination of sensitivity levels can help to the correct recommendation before the application, and thus, favor the greater technical, economic and environmental efficiency of weed management. The objective of this work was to validate a rapid method to detect...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Integrated weed management; Resistance; Control; Efficiency.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100222

Susceptibility Among Populations of Crabgrass to Herbicides Inhibiting Photosystem II
Provedor de dados: 87
Autores: LUCIO,F.R.; BARROSO,A.A.M.; TOLEDO,R.E.B.; PITELLI,R.A.; VICTORIA FILHO,R.
ABSTRACT: Weed interference reduces the productive potential of crops. Among the control methods used, chemical ones occupy a major position. The repeated application of the same mechanism of action selects tolerant plants. Among the species that affect sugarcane, crabgrass is one of them. This study has aimed to know the tolerance of different populations of this species to herbicides inhibiting photosystem II. Three populations were collected, identified and submitted to the application of ametryn and diuron herbicides in ten different doses, and the experiment was conducted in a experimental design of complete randomized blocks with four repetitions in a factorial arrangement of 10 x 3 (10 doses x 3 populations), being one trial for each herbicide....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Digitaria horizontalis; Ametryn; Diuron; Tolerance; Resistance.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100242

Occurrence of Horseweed Biotypes with Low Susceptibility to Glyphosate in the States of Rio Grande do Sul, Paraná and Mato Grosso do Sul, Brazil
Provedor de dados: 87
Autores: RIZZARDI,M.A.; SCHNEIDER,T.; BIANCHI,M.A.; ROCKENBACH,A.P.
ABSTRACT: Horseweed is an annual cycle weed naturally controlled by the herbicide glyphosate. However, the continued use of this product has selected tolerant and resistant populations. The objective of this study is to analyze the occurrence of horseweed biotypes with a low glyphosate susceptibility in the states of Rio Grande do Sul, Paraná and Mato Grosso do Sul. Seeds of horseweed plants (Conyzaspp.) that survived glyphosate applications were collected in RR soybean crops, totaling 137 samples from 37 municipalities. The seeds of the biotypes were sown, and the plants originated from them, when they reached the stage of four to six leaves, were subjected to a treatment with 1,440ga.e.ha-1 of glyphosate. According to the results, 108biotypes were not...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conyza bonariensis; Conyza sumatrensis; Conyza canadensis; Resistance; Chemical control.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100290

Monitoring of Resistance of Sourgrass to Glyphosate Herbicide in Urban Areas of the State of São Paulo, Brazil
Provedor de dados: 87
Autores: GAZOLA,T.; DIAS,M.F.; CARBONARI,C.A.; VELINI,E.D.
ABSTRACT: The objective of this work was to monitor the resistance of sourgrass (Digitaria insularis) to glyphosate in urban areas of the State of São Paulo to understand the spread of resistant biotypes. Three experiments were conducted under greenhouse conditions in a completely randomized design, with four replications. In the first experiment, seven sourgrass biotypes were used, and the control of plants was evaluated at 7, 14, 21, 28, and 35 days after application (DAA) of glyphosate. In the second experiment, the shikimic acid accumulation was quantified at 72 hours after the glyphosate application, and the same evaluations of weed control were performed. In the third experiment, rate-response curves were developed, with glyphosate at rates of 0, 90,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Shikimic acid; Digitaria insularis; EPSPS; Resistance.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100183

Residual Activity of [imazapic+imazapyr] Applied to Imidazolinones Resistant Soybean on Cotton in Succession
Provedor de dados: 87
Autores: MATTE,W.D.; CAVALIERI,S.D.; PEREIRA,C.S.; IKEDA,F.S.; POLTRONIERI,F.
ABSTRACT: In the current scenario of resistance of weeds to glyphosate in grain and fiber production systems, imidazolinone-resistant soybean is shown as an option in the rotation of biotechnology events and herbicide action mechanisms through the application of [imazapic+imazapyr]. However, due to its persistence in the soil, the herbicide may harm the subsequent crop. The objective of this work was to evaluate the residual activity of the herbicide [imazapic+imazapyr] applied in pre-emergence in soybean cultivation on cotton in succession. The experimental design was a randomized block design with five replicates, using seven concentrations (0; 6.25; 12.5; 25; 50; 100 and 200%) of the recommended dosage of the herbicide [imazapic+imazapyr] ([78,75+26,25]...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Gossypium hirsutum; Carryover; Herbicide; Resistance.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100345

Glyphosate influence on the physiological parameters of Conyza bonariensis biotypes
Provedor de dados: 87
Autores: Vargas,L.; Silva,D.R.O.; Agostinetto,D.; Matallo,M.B.; Santos,F.M.; Almeida,S.D.B.; Chavarria,G.; Silva,D.F.P.
The objective of this study was to determine changes in gas exchange and inhibition of EPSPs, based on the accumulation of shikimic acid in horseweed biotypes resistant and sensitive to glyphosate. Two experiments were conducted in a factorial model. The first one evaluated horseweed biotypes (one resistant and one susceptible to glyphosate), and herbicide rates (0 and 1,080 g a.e. ha ¹) applied on the weed. In the second experiment, the horseweed biotypes (susceptible and resistant to glyphosate) were evaluated in five periods as following: 0, 3, 7, 10, and 14 days after herbicide application (DAH). The photosynthetic rate, transpiration, carboxylation efficiency, and water efficiency were determined using an infrared gas analyzer (IRGA), and shikimic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hairy fleabane; Resistance; Photosynthesis; EPSPs; Shikimic acid.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000100017

Determination of photosynthetic pigments in fleabane biotypes susceptible and resistant to the Herbicide Glyphosate
Provedor de dados: 87
Autores: Kaspary,T.E.; Lamego,F.P.; Cutti,L.; Aguiar,A.C.M.; Bellé,C.
Chlorophylls and carotenoids are the main photosynthetic pigment in plants. In the weeds, the greatest amount of photosynthetic pigments can result in high competitiveness of the species. The aim of this study was to quantify the content of photosynthetic pigments in biotypes of fleabane (Conyza bonariensis) susceptible and resistant to glyphosate, by two different methods, as well as a correlation between chlorophyll content obtained by portable and classical methodology (extractable chlorophyll). An experiment was conducted in greenhouse and laboratory, 2 x 5 factorial scheme, where factor A was equivalent to biotypes of fleabane (resistant and susceptible to glyphosate) and factor B to developmental stages plants (rosette vegetative I, II and III and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conyza bonariensis; Chlorophyll; Carotenoids; Resistance.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000200020

Glyphosate translocation in hairy fleabane (Conyza bonariensis) biotypes
Provedor de dados: 87
Autores: Ferreira,E.A.; Galon,L.; Aspiazú,I.; Silva,A.A.; Concenço,G.; Silva,A.F.; Oliveira,J.A.; Vargas,L.
The objective of this work was to evaluate the translocation of glyphosate in C. bonariensis plants resistant and susceptible to that herbicide. The 14C-glyphosate was mixed with commercial gyhphosate (800 g ha-1) and applied on the center of the adaxial face of a third node leaf, using a micro syringe, and adding 10 µL of a solution with specific activity of 1,400 Bq, 45 days after plant emergence. The concentration of the glyphosate translocated in the plant was evaluated at time intervals of 6, 12, 36 and 72 hours after being applied on the application leaf, stem, roots and leaves. Ten hours after treatment application, the distribution of the product in the application leaf, divided into base, center and apex, was also evaluated by measuring the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Herbicides; Radiochemical; Resistance; Translocation.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582008000300020

Sourgrass phenological stage and efficacy of ACCase-inhibiting herbicides
Provedor de dados: 87
Autores: C. Presoto,Jéssica; F. Andrade,Jeisiane; A. Souza,Laura; S. Teixeira,Laura; J.P. Carvalho,Saul.
Abstract  Background:  Sourgrass (Digitaria insularis) is a highly disseminated weed in Brazil. It is a perennial grass weed that has high infesting capacity in agricultural areas and presents glyphosate-resistant biotypes. An effective post-emergence control of sourgrass plants depends on their phenological stage at the time of herbicide application.  Objective:  This work was developed with the objective of evaluating the effect of the sourgrass phenological stage at the time of herbicide application on the efficacy of ACCase-inhibiting herbicides.  Methods:  Two independent experiments were conducted under greenhouse conditions to evaluate two ACCase-inhibiting herbicides: clethodim, and haloxyfop. The treatments were applied using a completely...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Digitaria insularis; Clethodim; Haloxyfop; Management; Resistance.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100336

Geographic Distribution of Ryegrass Resistent to the Clethodim Herbicide in Rio Grande do Sul1
Provedor de dados: 87
Autores: VARGAS,L.; SCHNEIDER,T.; AGOSTINETTO,D.; BIANCHI,M.A.
ABSTRACT Ryegrass is a weed of annual cycle that is present in winter crops, in orchards and vineyards of the South region of Brazil. The species is normally controlled by the glyphosate herbicide, but the continuous use of this product caused the selection of resistant biotypes. The use of ACCase inhibitor herbicides is the main alternative for the control of this species, but it has not been satisfactory in some places, thus causing suspicion of resistance to this action mechanism. Thus, the objective of this paper was to evaluate the occurrence and geographic distribution of ryegrass biotypes that are resistant to the clethodim herbicide in the state of Rio Grande do Sul. For that, seeds of ryegrass plants that survived the application of clethodim were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lolium multiflorum; Resistance; Chemical control; Acetyl coenzyme A carboxylase.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000200365

Reduction of seed production of red rice escapes in clearfield rice
Provedor de dados: 87
Autores: Menezes,V.G.; Kalsing,A.; Mariot,C.H.P.; Grohs,D.S.; Freitas,T.F.S.
Roguing is a practice used to reduce the seed source of red rice escapes to control in Clearfield-rice areas. However, there is great difficulty in performing it in large and heavily infested rice fields. This objective of this work was to evaluate the effects of the use of imazamox herbicide, applied in different rates and times, on plants of Clearfield-rice and red rice. Four experiments were conducted during the 2007/08 and 2008/09 growing seasons, in completely randomized block design and treatments arranged in factorial design, using three replications per treatment. The treatments had increasing rates of imazamox, application times and rice cultivars. The rice cultivars tested were IRGA 417, IRGA 422 CL, Avaxi CL and Puitá INTA CL. The variables...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa; Imazamox; Roguing; Resistance; Prevention.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000400018

Solving the Problem of Sustainable Use of Bt Crops
Provedor de dados: 31
Autores: Dun,   Zhe; Mitchell,   Paul D.
Transgenic plants producing insecticidal protein derived from Bacillus thuringiensis (Bt) have been widely adopted since their commercial introduction in 1996. The widespread adoption of such plants has reduced use of conventional insecticides while attaining yield gains, thus providing economic, environmental and human health benefits. However, the benefits from Bt crops will be reduced or even eliminated if pests develop resistance to these toxins so that Bt crops are less or no longer effective. Although field resistance to Bt crops has not yet been found in the continental U.S., resistance to Bt sprays has been found in diamondback moth and greenhouse populations of cabbage looper. Hence, considerable attention has been devoted to developing management...
Tipo: Conference Paper or Presentation
Palavras-chave: Resistance; Bio-tech; Sustainable; Agricultural and Food Policy; Crop Production/Industries; Environmental Economics and Policy.
Ano: 2011
URL: http://purl.umn.edu/103581

Do Refuge Requirements for Biotechnology Crops Promote Economic Efficiency? Some Evidence for Bt Cotton
Provedor de dados: 31
Autores: Livingston,   Michael J.; Storer,   Nicholas P.; Van Duyn,   John W.; Kennedy,   George G.
We examine producer behavior, resistance evolution, and returns under alternative refuge requirements in an eastern North Carolina region with multiple corn, cotton, and soybean fields infested by a mobile pest. Returns are highest, pyrethroid sprays occur least frequently, and pyrethroid resistance evolution is delayed most effectively with no refuge requirement. Complying with the current 20% refuge requirement costs the producer $8.67 per cotton acre, or $34.21 per non-transgenic insecticidal (Bt) cotton acre. Returns are highest under each refuge requirement when one-toxin Bt cotton is not phased out; however, removal of the technology at the earliest phase-out date minimizes regional pyrethroid sprays.
Tipo: Journal Article
Palavras-chave: Bollworm; Bt cotton; Pyrethroids; Resistance; Structured refuge; Unstructured refuge; Crop Production/Industries; Research and Development/Tech Change/Emerging Technologies; Q16; Q56; Q57; Q58; R34; R38.
Ano: 2007
URL: http://purl.umn.edu/6619

Productivity and Economic Effects of Antibiotics Used for Growth Promotion in U.S. Pork Production
Provedor de dados: 31
Autores: Miller,   Gay Y.; Algozin,   Kenneth A.; McNamara,   Paul E.; Bush,   Eric J.
Public health experts are concerned about the diminishing efficacy of antibiotics.  Some have called for a ban on growth-promoting antibiotics in animal agriculture.  This study identifies the contribution of growth-promoting antibiotics in the grower/finisher phase of U.S. pork production.  With National Animal Health Monitoring System swine data, relationships are estimated between growth-promoting antibiotic use and productivity.  Results indicate improvements in average daily gain (0.5%), feed conversion ratio (1.1%), and mortality rate (reduced 0.22 percentage points); these productivity improvements translate into a profitability gain of $0.59 per pig marketed, or an improvement of 9% in net profits associated with growth promotion antibiotics.
Tipo: Journal Article
Palavras-chave: Antibiotics; Economics; Growth promotants; Productivity; Resistance; Swine; Q12; Q18.
Ano: 2003
URL: http://purl.umn.edu/43146

AN EQUILIBRIUM ANALYSIS OF THE IMPACT OF ANTIBIOTICS BANS ON INVESTMENT IN APPLE ORCHARDS
Provedor de dados: 31
Autores: Hennessy,   David A.; Roosen,   Jutta.
The decision to replant a fire blight-susceptible apple orchard is analyzed.  Embedding the problem into an equilibrium framework facilitates the welfare analysis of changes in orchard survival probabilities arising from a ban on antibiotics use.  We estimate the structural impacts and welfare changes of the ban.
Tipo: Conference Paper or Presentation
Palavras-chave: Antibiotics; Apple orchard; Dynamics; Equilibrium; Replanting; Resistance; Truncated Poisson process; Environmental Economics and Policy; Research and Development/Tech Change/Emerging Technologies.
Ano: 1999
URL: http://purl.umn.edu/21698

Worms – what’s new: some recent developments in worm control in ruminants and camelids
Provedor de dados: 31
Autores: Love,   Stephen.
Special Edition Sheep and Cattle Production in New South Wales
Tipo: Article
Palavras-chave: Worms; Faecal egg counting; Integrated parasite management; Resistance; Farm Management.
Ano: 2011
URL: http://purl.umn.edu/121462

Comparative Evaluation of the Effects of Binzalkonium Chloride, Iodine, Gluteraldehyde and Hydrogen Peroxide Disinfectants against Avian Salmonellae Focusing on Genotypic Resistance Pattern of the Salmonellae Serotypes toward Benzalkonium Chloride
Provedor de dados: 89
Autores: Aksoy,A; El Kahlout,KEM; Yardimci,H.
ABSTRACT Using disinfectants in poultry houses is a common practice to ban the zoonotic pathogens like Salmonella. A major concern in using disinfectants is the emergence of bacteria strains that resist some disinfectants. This phenomenon is manifested in the resistance of some Salmonella serotypes against quaternary ammonium compounds. Such resistance is attributed to qacEΔ1 gene which may be possessed by some Salmonella serotypes. This work aimed to evaluate the resistance of Salmonella serotypes (S. Typhimurium, S. Infantis and S. Entiridis) against different disinfectants (benzalkonium chloride, iodine, gluteraldehyde and hydrogen peroxide). The effect of the disinfectants were evaluated by treatment of the bacteria with different concentrations...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Disinfectants; PCR; Poultry; Resistance; Salmonella.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2020000100301

Phenotypic and genotypic resistance profile of Salmonella Typhimurium to antimicrobials commonly used in poultry
Provedor de dados: 89
Autores: Biffi,CP; Stefani,LM; Miletti,LC; Matiello,CA; Backes,RG; Almeida,JM; Neves,GB.
Isolates of Salmonella sp (104) from poultry samples were isolated and serotyped where eleven were identified as Salmonella Typhimurium (ST). ST isolates were phenotypically tested by disk diffusion and minimum inhibitory concentration (MIC). Four genes related to enrofloxacin (GyrA, GyrB, ParC and ParE), two to gentamicin (AadA and AadB) and two to ceftiofur (BlaCMY-2 and AmpC) resistance were searched by PCR. Our results showed ST resistance to all three antibiotics tested (18.1% for ceftiofur, 45.4% for gentamicin, and 18.1% for enrofloxacin) according to the diffusion test. In the MIC test, the ST isolates showed higher levels of resistance (27.2% for ceftiofur, 54.5% for gentamicin, and 18.2% for enrofloxacin). Three resistance genes out of four...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antimicrobial; Gene; Resistance; Salmonella.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2014000200013

Susceptibility of different genotypes of rice to Sitophilus zeamais Motschulsky 1885 attack (Coleoptera: Curculionidae)
Provedor de dados: 91
Autores: Colares,Tatiane; Dionello,Rafael G.; Radunz,Lauri L.
ABSTRACT Rice (Oryza spp.), the most important cereal in the world, is grown and consumed in all continents. Brazil is among the top ten producing countries. Stored grains can be attacked by pests (rodents, insects, fungi and mites) that cause serious qualitative and quantitative losses. Because of these losses, one way to alleviate the problem caused by insects during rice storage is the use of resistant materials (grains). Thus, the aim of this study was to evaluate grains from nine different genotypes of rice, in order to identify the existence of materials less susceptible to the attack of Sitophilus zeamais, during 180 days of storage. The mean time of biological cycle (days), susceptibility index (IS) and the number of weevils emerged were evaluated....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Resistance; Rice genotypes; Storage; Weevil.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000300275

Enzymatic activity of three sugarcane varieties under salt stress
Provedor de dados: 91
Autores: Carvalho,Mercia F.; Correa,Marcus M.; Carvalho,Gian C.; Rolim Neto,Fernando C.; Marinho,Gessica P. A.; Andrade,Sunamita B. de.
ABSTRACT Sugarcane is a species of great economic importance to Brazil. The study of enzymatic activity has helped to identify varieties of sugarcane tolerant to salt stress, for planting in Brazilian semiarid regions, where there is the occurrence of saline soils. The objective of this study was to evaluate the enzymatic activity of three varieties of sugarcane subjected to stress caused by salinity. The experiment was conducted in a greenhouse at the Federal Rural University of Pernambuco, in a completely randomized design with four replicates. The leaf blade samples were collected for analysis of soluble proteins and determination of the activity of catalase and ascorbate peroxidase. The protein content was higher for RB962962 and lower for the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Salinity; Antioxidant enzymes; Resistance.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000900806

Physical-mechanical properties of multinutrient blocks with different binders for goats and sheep intake
Provedor de dados: 91
Autores: Furtado,Dermeval A.; Castro,Thiago B. de S.; Lopes Neto,Jose P.; Constantino,Rodrigo A.; Cunha,Maria das G. G.; Nascimento,José W. B. do.
ABSTRACT Feed supplementation with multinutrient blocks (MB) for sheep and goats can be a viable alternative in the Brazilian semiarid region, and it is necessary to set an ideal hardness to obtain maximum feed efficiency. Therefore, this study aimed to evaluate the manufacture of MB using five binders: Portland cement, lime, kaolin, Portland cement + kaolin and lime + bentonite, at two percentages (7.5 and 10%) and two healing times (72 and 96 h). The experimental design was completely randomized in a 5 x 2 x 2 factorial scheme (binders, percentages and healing times, respectively), with five repetitions. Using lime in the MBs led to greater resistance in the specimens (208.53 kPa), as well as the greater percentage of binders (10%), ensuring higher...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water absorption; Hardness; Resistance; Feed supplementation.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000800558

Peaches tree genetic divergence for brown rot reaction
Provedor de dados: 94
Autores: Wagner Júnior,Américo; Fabiane,Keli Cristina; Oliveira,Jéssica Scarlet Marth Alves de; Zanela,Juliano; Citadin,Idemir.
It was evaluated the genetic divergence in peach genotypes for brown rot reaction. It was evaluated 26 and 29 peach genotypes in the 2009/2010 and 2010/2011 production cycle, respectively. The experiment was carried out at the Laboratório de Fitossanidade, da UTFPR - Campus Dois Vizinhos. The experimental design was entirely randomized, considering each peach genotype a treatment, and it was use three replication of nine fruits. The treatment control use three replication of three peach. The fruit epidermis were inoculated individually with 0.15 mL of M. fructicola conidial suspension (1.0 x 10(5) spores mL-1). In the control treatment was sprayed with 0.15 mL of distilled water. The fruits were examined 72 and 120 hours after inoculation, and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Breeding; Monilinia fructicola; Resistance; Prunus sp.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452011000500075

PENETRATION, DEVELOPMENT, AND REPRODUCTION OF Meloidogyne enterolobii ON Psidium SPECIES AND INDUCED CELLULAR RESPONSES IN THE ROOTS
Provedor de dados: 94
Autores: SOUSA,ALAIN DENIS DE; PEDROSA,ELVIRA MARIA RÉGIS; SILVA,CLÁUDIA ULISSES DE CARVALHO; CASTRO,JOSÉ MAURO DA CUNHA E; RIBEIRO,JULIANA MARTINS.
ABSTRACT Meloidogyne enterolobii has severely compromised the main guava producing regions in Brazil, thereby stimulating the development of resistant varieties for efficient management of this nematode. This study aimed to assess the penetration, development, reproduction, and induced cellular responses of M. enterolobii in roots of four species of the genus Psidium (P. guajava‘Paluma’, P. guineense, P. cattleyanum, and P. friedrichstalianum) from the Active Germplasm Bank (BAG) of the Center for Agricultural Research of the Semi-arid Tropics (Embrapa Semi-arid) located in Petrolina, PE, Brazil. Three experiments were carried out to assess the penetration, development, and reproduction of the nematode and, subsequently, histological analyses were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Guava root-knot nematode; Psidium cattleyanum; P. friedrichstalianum; P. guajava; P. guineense; Resistance.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452017000200402

Reações da espécie invasora Achatina fulica (Mollusca: Achatinidae) à fatores abióticos: perspectivas para o manejo
Provedor de dados: 103
Autores: Fischer,Marta Luciane.
Achatina fulica Bowdich, 1822 is an african snail that is invasive in different parts of the world, being characterized mainly by its high adaptability. Our objective was to evaluate the influence of abiotic factors, such as temperature and substrate, on the egg eclosion, adult and juvenile reaction to different abiotics factors, and the resistance of A. fulica to popular methods of control. Three studies were made, including 19 laboratory experiments and observations of free animals in the municipal district of Guaraqueçaba, southern Brazil. Eggs were characterized as the most fragile phase, whereas the juveniles and adults were resistant to the immersion in fresh and salt water and little resistant to temperature variation and salt, using burying,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aestivation; Exotic invasive species; Giant african snail; Guaraqueçaba; Resistance.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000300001

Agar diffusion tests with cefuroxime disks for predicting ceftriaxone susceptibility among isolates of Streptococcus pneumoniae
Provedor de dados: 59
Autores: Dias,Cícero A.G.; Kader,Ivonyr A.; d’Azevedo,Pedro; Superti,Silvana; Alves,Dirce; Olm,Gislaine.
The performance of agar diffusion tests using disks of cefuroxime (30µg) for predicting ceftriaxone susceptibility in 33 isolates of Streptococcus pneumoniae was studied. All 7 resistant isolates to ceftriaxone (MIC &lt;FONT FACE="Symbol"&gt;³&lt;/FONT&gt;1.0 µg/ml) exhibited zones of inhibition &amp;lt;28mm. The procedure can be easily adapted to clinical laboratories.
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Screening test; Resistance; Pneumococcus.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37141998000400016

An overview of sugarcane brown rust in Cuba
Provedor de dados: 63
Autores: La O,María; Perera,María Francisca; Bertani,Romina Priscila; Acevedo,Ricardo; Arias,Marta Eugenia; Casas,Mario Alberto; Pérez,Juana; Puchades,Yaquelín; Rodríguez,Eida; Alfonso,Isabel; Castagnaro,Atilio Pedro.
ABSTRACT: Multiple pathogens affect sugarcane, among them Puccinia melanocephala, the causal agent of brown rust. This disease was first reported in Cuba in 1979 when it was responsible for a severe attack on the main sugarcane variety B4362. The aims of the present study were to give an overview of sugarcane brown rust in Cuba and show the current disease situation in the country. A retrospective analysis regard to sugarcane cultivar composition resistant to brown rust in Cuba was carried out. In addition 154 genotypes, including the most used progenitors in the breeding program and commercial varieties were evaluated under natural infection conditions. The identity of P. melanocephala was verified by Polymerase Chain Reaction (PCR) and by sequencing the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Puccinia melanocephala; Varietal mosaic; Resistance.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000300233

Screening of Passiflora species for reaction to Cowpea aphid-borne mosaic virus reveals an immune wild species
Provedor de dados: 63
Autores: Maciel,Scheila da Conceição; Nakano,Daniel Hiroshi; Rezende,Jorge Alberto Marques; Vieira,Maria Lúcia Carneiro.
Cowpea aphid-borne mosaic virus (CABMV) is a potyvirus that causes the most serious virus disease of passion fruit crops in Brazil. It is transmitted by several species of aphids in a non-persistent, non-circulative manner. The reaction of 16 species of Passiflora to infection by mechanical inoculation with four Brazilian isolates of CABMV was evaluated under greenhouse conditions. Only P. suberosa, a wild species, was resistant to infection by all virus isolates, in two independent assays. P. suberosa grafted onto infected P. edulis f. flavicarpa did not develop symptoms; neither was the virus detected by RT-PCR in the upper leaves, suggesting that this species is immune to CABMV.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Passifloraceae; Potyvirus; Resistance.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000300018

First report of Hypsipyla grandella (Lepidoptera: Pyralidae) on African mahogany Khaya ivorensis
Provedor de dados: 63
Autores: Zanetti,Ronald; Abreu,Caroline Silva; Silveira,Stephannie Hellinet Prado; Andrade,Eliana Donizete.
ABSTRACT The mahogany shoot borer Hypsipyla grandella Zeller is an important economic pest in all American tropical forests, because it prevents monoculture of valuable timber trees species like mahogany and cedar. The shoot borer damages several tree structures, especially the apical shoots, impairing the formation of the commercial stem. This pest can attack the plants during the year and one larva per plant is enough to cause significant damage. In infested areas, the attack can reach up to 100 % of the trees. The Australian cedar and African mahogany have been cultivated in Brazil for timber production, because they are considered resistant to H. grandella (Lepidoptera: Pyralidae) attack. However, in this work we report for the first time the H....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Meliaceae; Mahogany shoot borer; Resistance; Forest pest.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000600492

Reaction of sweet pepper to the potato virus y (PVYm)
Provedor de dados: 63
Autores: Echer,Márcia de Moraes; Costa,Cyro Paulino da.
Traditional sweet pepper cultivars showing susceptibility to the Potato virus Y (PVY) are being replaced by resistant hybrids with higher commercial value. Despite of much information about resistance source reaction and their inheritance, there is no knowledge about the genetic background of commercial resistant hybrids. Reaction of sweet pepper (Capsicum annuum L.) hybrids to the Potato virus Y (PVYm) such as Acuario, Magali R, Nathalie and their respective generations F2 and F3 as well as hybrids Amanda, Corteso W208, CPC-6272, Dagmar, Elisa, Magali, Margarita, Monteiro, Quantum, Vivo W205 was evaluated. Reaction to PVYm was evaluated as resistant or susceptible. Magali R and Nathalie hybrid did not show any mosaic symptoms. Magali R and Nathalie...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capsicum annuum; Resistance; Potyvirus.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200016

Solar radiation affects grapevine susceptibility to Plasmopara Viticola
Provedor de dados: 63
Autores: Dalla Marta,Anna; Di Stefano,Valentina; Cerovic,Zoran G.; Agati,Giovanni; Orlandini,Simone.
Solar radiation plays an important role in the development of some fungal diseases due to its direct action on the microorganisms and also its indirect effect on the production of specific plant compounds. This experiment examined the effect of two light environments (100% and 35% of full strength) on the polyphenolic content of grapevine leaves and quantified their relation to resistance to downy mildew (Plasmopara viticola). Leaf epidermal polyphenolic contents were non-destructively measured during the growing season 2006 using the Dualex chlorophyll fluorescence-based portable leaf-clip. The experimental design consisted of six parcels of 30 vines and measurements were performed on the 12 central vines. The leaves were inoculated with a sporangia...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ultra-violet radiation; Photosynthetic active radiation; Polyphenolics; Downy mildew; Resistance.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000700011

Reaction of dwarf cashew clones to Colletotrichum gloeosporioides isolates in controlled environment
Provedor de dados: 63
Autores: López,Ana Maria Queijeiro; Lucas,John Alexander.
The cashew (Anacardium occidentale L.) crop is an important source of income for the population of the Brazilian Northeast, and anthracnose disease caused by Colletotrichum gloeosporioides leads to significant production loss. However, there is little information on either the host resistance or the variation in the aggressiveness of the pathogen under controlled environment. The reaction of commercial (CCP-06, CCP-09, CCP-76 and CCP-1001) and one non-commercial (CAP-14) dwarf cashew clones was assessed against 36 isolates of this fungus controlled environmental conditions. All the isolates, including those from hosts other than cashew, were able to cause lesions on leaves and stems of most clones, albeit to different degrees. Clone CCP-06 was the most...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anacardium occidentale; Anthracnose; Resistance; Aggressiveness.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000200016

Sources of resistance to Crinipellis perniciosa in progenies of cacao accessions collected in the Brazilian Amazon
Provedor de dados: 63
Autores: Paim,Valéria Rodrigues Lavigne de Mello; Luz,Edna Dora Martins Newman; Pires,José Luís; Silva,Stela Dalva Vieira Midlej; Souza,Jorge Teodoro de; Albuquerque,Paulo Sérgio Bevilaqua; Santos Filho,Lindolfo Pereira dos.
The witches' broom disease caused by the fungus Crinipellis perniciosa is the main phytossanitary constraint for cacao production in Brazil. The integrated management of the disease involves resistance as one of the components. The breeding program conducted by the Brazilian Institution, CEPLAC is directed toward the pyramidation of resistance genes from different sources to achieve a more durable resistance. This study aimed to identify sources of resistance in progenies of cacao accessions collected in the basins of ten Amazonian rivers and compared to progenies from the Peruvian clones 'Scavina 6' and 'Sacavina 12'. Progenies from 40 Amazonian accessions and 'Scavina' were evaluated in the field for six years for witches' broom resistance through...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Theobroma cacao; Genetic breeding; Resistance; Witches' broom disease.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000600011

AFLP and SRAP markers linked to the mj gene for root-knot nematode resistance in cucumber
Provedor de dados: 63
Autores: Devran,Zübeyir; Firat,Ahmet Fikret; Tör,Mahmut; Mutlu,Nedim; Elekçioğlu,Ibrahim Halil.
Root-knot nematodes (Meloidogyne spp.) are an important worldwide pest of cucumber (Cucumis sativus L.). Molecular markers linked to the Javanese root-knot nematode (M. javanica) resistance gene mj in cucumber may aid marker assisted selection. One-hundred AFLP (EcoRI-MseI) and 112 SRAP were used to screen resistant and susceptible parents for polymorphisms to develop molecular markers linked to the mj gene. Of the 100 AFLP primers, 92 produced bands and two yielded candidate markers (E-ATT/M-CAA and E-AAC/M-CTG). These two bands were cut off from polyacrylamide gel, cloned and sequenced. Primers designed from the sequences did not yield polymorphic bands between the parents. In addition, the sequences did not contain any restriction site or indel to be...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Meloidogyne javanica; Resistance; Molecular breeding.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000100017

Caracterização molecular de dois isolados brasileiros de Lettuce mosaic virus apresentando propriedades biológicas distintas
Provedor de dados: 102
Autores: KRAUSE-SAKATE,RENATE; MELLO,RAQUEL N.; PAVAN,MARCELO A.; ZAMBOLIM,EUNIZE M.; CARVALHO,MURILO G.; LE GALL,OLIVIER; ZERBINI,F. MURILO.
Efetuou-se a clonagem e seqüenciamento do gene que codifica a proteína capsidial de dois isolados do vírus do mosaico da alface (Lettuce mosaic virus, LMV) provenientes do estado de São Paulo, previamente caracterizados como pertencentes aos patótipos II (AF198, incapaz de infetar cultivares com os genes de resistência mo1¹ ou mo1²) e IV (AF199, capaz de quebrar a resistência propiciada pelos genes mo1¹ e mo1²), com base na virulência em cultivares diferenciadoras. Análise comparativa das seqüências de nucleotídeos de isolados provenientes da Europa, América do Norte, Oriente Médio e os dois isolados brasileiros não permitiu sua separação em estirpes, pois as porcentagens de homologia foram sempre superiores a 95%. Entretanto, análise filogenética dos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lactuca; Lettuce; Potyvirus; LMV; Capsid protein; Cloning; Resistance.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582001000200006

Transgenic passionfruit expressing RNA derived from Cowpea aphid-borne mosaic virus is resistant to passionfruit woodiness disease
Provedor de dados: 102
Autores: Alfenas,Poliane F.; Braz,Antonio Sérgio K.; Torres,Leonardo B.; Santana,Enilton N.; Nascimento,Ana Verônica S. do; Carvalho,Murilo G. de; Otoni,Wagner C.; Zerbini,F. Murilo.
Sixteen transgenic yellow passionfruit (Passiflora spp.) plants (R0) were obtained which express a non-translatable transgenic RNA corresponding to the 3' region of the NIb gene and the 5' region of the CP gene, derived from the genome of a Brazilian isolate of Cowpea aphid-borne mosaic virus (CABMV). The transgenic plants were propagated by stem cuttings and challenged by sap inoculation with isolates CABMV-MG1 and CABMV-PE1. One transgenic plant (TE5-10) was resistant to the isolate CABMV-MG1, but susceptible to CABMV-PE1. The remaining transgenic plants developed systemic symptoms, equal to non-transformed plants, when inoculated with either isolate. The absence of virus in TE5-10 plants was confirmed by indirect ELISA. Transcription analysis of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Passionfruit woodiness virus; PWV; Potyvirus; Resistance.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582005000100006

Resistance spectra of wheat cultivars and virulence diversity of Magnaporthe grisea isolates in Brazil
Provedor de dados: 102
Autores: Urashima,Alfredo S.; Lavorent,Norberto A.; Goulart,Augusto C. P.; Mehta,Yeshwant R.
Seventy-two monoconidial isolates of Magnaporthe grisea were obtained from the States of Mato Grosso do Sul and Paraná. The isolates were inoculated on seedlings of 20 wheat (Triticum aestivum) cultivars under greenhouse conditions. The virulence diversity of M. grisea was assessed based on compatible and incompatible reactions of leaf blast on wheat cultivars. Fifty-four distinct virulence patterns were identified on test cultivars among the isolates collected from the two wheat growing States. Sixteen of these isolates corresponding to 22.2% showed similar virulence pattern. None of the wheat cultivars was resistant to all isolates of M. grisea, but the cultivars differed in degree of resistance as measured by the relative spectrum of resistance (RSR)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pyricularia grisea; Triticum aestivum; Resistance; Control.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582004000500007

Pathotype diversity of Pyricularia grisea from improved upland rice cultivars in experimental plots
Provedor de dados: 102
Autores: PRABHU,ANNE S.; FILIPPI,MARTA C.; ARAUJO,LEILA G.
A study was undertaken to examine the pathogenic diversity of Pyricularia grisea isolates retrieved from 14 upland rice (Oryza sativa) cultivars in experimental plots during a period of five years. Inoculations were performed on 32 genotypes with 85 monoconidial isolates under controlled greenhouse conditions. Based on the reaction pattern of eight international differentials, eleven pathotypes of P. grisea were identified. The predominant international races or pathotypes were IB-9 (56.4%), IB-1 (16.4%) and IB-41 (11.8%). A set of eight commercial upland rice cultivars ('Carajás', 'Confiança', 'Maravilha', 'Primavera', 'Progresso', 'Caiapó', 'IAC-47', 'IAC-201') was utilized as additional differentials for describing the virulence pattern of P. grisea....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa; Magnaporthe grisea; Physiologic races; Differential varieties; Resistance; Virulence.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582002000500005

Development of virus resistant transgenic papayas expressing the coat protein gene from a Brazilian isolate of Papaya ringspot virus
Provedor de dados: 102
Autores: Souza Júnior,Manoel T.; Nickel,Osmar; Gonsalves,Dennis.
Translatable and nontranslatable versions of the coat protein (cp) gene of a Papaya ringspot virus (PRSV) isolate collected in the state of Bahia, Brazil, were engineered for expression in Sunrise and Sunset Solo varieties of papaya (Carica papaya). The biolistic system was used to transform secondary somatic embryo cultures derived from immature zygotic embryos. Fifty-four transgenic lines, 26 translatable and 28 nontranslatable gene versions, were regenerated, with a transformation efficiency of 2.7%. Inoculation of cloned R0 plants with PRSV BR, PRSV HA or PRSV TH, Brazilian, Hawaiian and Thai isolates, respectively, revealed lines with mono-, double-, and triple-resistance. After molecular analysis and a preliminary agronomic evaluation, 13 R1 and R2...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carica papaya; Potyvirus; Resistance; Breeding; Virus.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582005000400004

Effect of continuous growing of resistant soybean genotypes on Meloidogyne arenaria race 1 reproduction
Provedor de dados: 102
Autores: PEDROSA,ELVIRA M.R.; MOURA,ROMERO M.
Even though resistance is the most promising tactic for root-knot nematode management on soybean (Glycine max), virulent biotypes may occur and be selected on specific resistant plant genotypes. In the present study, reproduction rate of Meloidogyne arenaria race 1 increased after four sequences of continuous culture of the parasite on resistant soybean genotypes.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Resistance; Root-knot nematode; Virulence.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582001000100017

Response of cucurbit species to Rotylenchulus reniformis
Provedor de dados: 102
Autores: Torres,Gustavo R. C.; Pedrosa,Elvira M. R.; Siqueira,Kércya M. S.; Moura,Romero M.
The state of Rio Grande do Norte is the major melon (Cucumis melo) producer in Brazil and the reniform nematode Rotylenchulus reniformis has become increasingly important due to damages to that crop and the lack of resistant cultivars and effective control measures. Under these circumstances, eight cucurbit genotypes were screened for resistance or tolerance to a population of R. reniformis in naturally infested field soil, under greenhouse conditions. A high reduction in shoot mass was found in all infected genotypes. Watermelon (Citrullus lanatus) cv. Sugar Baby showed the lowest rate of nematode reproduction.
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Reniform nematode; Resistance; Tolerance; Cucumis spp.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582005000100016

Natural variability in Arabidopsis thaliana germplasm response to Xanthomonas campestris pv. campestris
Provedor de dados: 102
Autores: Carmo,Lílian S.T.; Cândido,Elizabete S.; Campos,Pollyanna F.; Quezado-Duval,Alice Maria; Leonardecz,Eduardo; Lopes,Carlos A.; Quirino,Betania F.
This work aimed to study the interaction between the model plant Arabidopsis thaliana and Xanthomonas campestris pv. campestris (Xcc), the pathogen responsible for black rot of crucifers. The response of 32 accessions of A. thaliana to the Brazilian isolate of Xcc CNPH 17 was evaluated. No immunity-like response was observed. "CS1308", "CS1566" and "CS1643" grown in continuous light were among the accessions that showed strongest resistance when inoculated with 5 x 10(6) CFU/mL. In contrast, "CS1194" and "CS1492" were among the most susceptible accessions. Similar results were obtained when plants were grown under short-day conditions. To quantify the differences in disease symptoms, total chlorophyll was extracted from contrasting accessions at different...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Susceptibility; Resistance; Black rot of crucifers; Plant-pathogen interaction.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582007000200001

Virulence pattern of Pyricularia grisea isolates from farmers' fields on newly released upland rice cultivars
Provedor de dados: 102
Autores: Araújo,Leila G.; Prabhu,Anne S.; Silva,Gisele B. da.
The virulence pattern of the isolates of Pyricularia grisea from commercial fields of the upland rice (Oryza sativa) cultivars 'Primavera' and 'BRS Bonança' was analyzed. A hundred and seventy monoconidial isolates of the pathogen virulent to 'Primavera' and 139 to 'BRS Bonança' collected from eight fields, during two years (2001-2003) were tested, under greenhouse conditions, on six newly released rice cultivars. Differences in virulence pattern were observed in pathogenic populations of 'Primavera' and 'BRS Bonança'. Isolates with virulence to improved cultivars were common in samples from farmers' fields in the absence of aloinfection. The virulence frequency of P. grisea isolates collected from 'Primavera'' to cultivars 'BRS Vencedora', 'BRS Colosso',...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa; Magnaporthe grisea; Rice blast; Physiologic races; Resistance.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582005000600009

Identification of sources of resistance in sorghum to Peronosclerospora sorghi
Provedor de dados: 102
Autores: Barbosa,Flavia C. R; Casela,Carlos R; Pfenning,Ludwig H; Santos,Fredolino G.
The main objective of this work was to identify sources of resistance in sorghum (Sorghum bicolor) to Peronosclerospora sorghi, the causal agent of downy mildew, through the evaluation of 42 sorghum genotypes under natural infection in the field. Genotypes were planted in single row plots between two rows of the susceptible line SC283, planted 30 days before, to act as spreader rows, in two separate nurseries. The experimental design was a completely randomized block design with three replications. Sorghum genotypes CMSXS156, CMSXS157, CMSXS243, TxARG-1, 8902, 9902054, 9910032, 9910296, Tx430, QL-3, SC170-6-17, CMSXS762 and BR304 were classified as highly resistant in both nurseries. Among these, SC170-6-17 and 9910296 showed 0% systemic infection. Results...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Sorghum bicolor; Diseases; Genetic; Resistance; Downy mildew.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582005000500010

In vitro toxin production by Fusarium solani f. sp. piperis
Provedor de dados: 102
Autores: Duarte,Maria de Lourdes R.; Archer,Simon A.
Fusarium solani f. sp. piperis (teleomorph: Nectria haematococca f. sp. piperis), causal agent of root rot and stem blight on black pepper (Piper nigrum), produces secondary metabolites with toxigenic properties, capable of inducing vein discoloration in detached leaves and wilting in transpiring microcuttings. Production of F. solani f. sp. piperis (Fsp) toxic metabolites reached a peak after 25 days of static incubation on potato sucrose broth at 25 ºC under illumination. Changes in the pH of the culture filtrate did not alter the effect of toxic metabolites. However, when the pH was changed before the medium had been autoclaved, a more intense biological response was observed, with an optimum at pH 6.0. Isolates that produced red pigments in liquid...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Secondary metabolites; Resistance; Black pepper; Piper betle.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582003000300002

Ichthyometry and electrical bioimpedance analysis to estimate the body composition of tambatinga
Provedor de dados: 36
Autores: Andrade,Francisco Teixeira; Abreu,Márvio Lobão Teixeira de; Lopes,João Batista; Figueiredo,Agustinho Valente de; Araripe,Maria de Nazaré Bona Alencar; Ferreira,Antônio Hosmylton Carvalho.
Body composition analysis is relevant to characterize the nutritional requirements and finishing phase of fish. The aim of this study was to investigate the relationship between ichthyometric (weight, total and standard length, density and yields), bromatological (fat, protein, ash and water content) and bioelectrical-impedance-analysis (BIA) (resistance, reactance, phase angle and composition indexes) variables in the hybrid tambatinga (Colossoma macropomum × Piaractus brachypomus). In a non-fertilized vivarium, 520 juveniles were housed and fed commercial rations. Then, 136 days after hatching (DAH), 15 fish with an average weight of 37.69 g and average total length of 12.96 cm were randomly chosen, anesthetized (eugenol) and subjected to the first of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bromatology; Fish; Non-lethal assessment; Reactance; Resistance.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672014000200014

QTL IDENTIFICATION FOR CASSAVA BACTERIAL BLIGHT RESISTANCE UNDER NATURAL INFECTION CONDITIONS
Provedor de dados: 37
Autores: SOTO SEDANO,Johana; MORA MORENO,Rubén Eduardo; CALLE,Fernando; LÓPEZ CARRASCAL,Camilo Ernesto.
Cassava, Manihot esculenta Crantz, represents the main food source for more than one billion people. Cassava's production is affected by several diseases, one of the most serious is cassava bacterial blight (CBB) caused by Xanthomonas axonopodis pv. manihotis (Xam). A quantitative trait loci (QTL) analysis for CBB resistance was performed under natural infection conditions, using a mapping population of 99 full-sibs genotypes highly segregant and a SNP-based high dense genetic map. The phenotypic evaluation was carried out in Puerto López, Meta, Colombia, during the rainy season in 2015. Both resistant and susceptible transgressive segregants were detected in the mapping population. Through a non-parametric interval mapping analysis, two QTL were detected,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cassava; Molecular marker; QTL; Resistance; SNPs; Xanthomonas axonopodis pv. manihotis.
Ano: 2017
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2017000100002

Improvement of the specific detection of Xanthomonas phaseoli pv. manihotis based on the pthB gene
Provedor de dados: 1
Autores: Cerqueira Melo, Rita de Cássia; Dorea Bragança, Carlos Augusto; Nogueira Pestana, Katia; Silva, Harllen Sandro Alves da; Ferreira, Claudia Fortes; Alves Santos de Oliveira, Saulo.
Modifications were made in the PCR conditions aiming to overcome the problem of non-amplification of the Xanthomonas phaseoli pv. manihotis (Xpm) fragment, using the primer pair XV / XK described in the literature. The objective of this study was to propose changes in the primers already described (XV / XK_MOD) and validate the use of these new primers in identifying Xpm. The validation procedure was carried out with the primer pair XV and XK_MOD, using different strains of Xpm, other plant pathogenic and endophytic bacteria genera and one isolate of X. phaseoli pv. passiflorae. As a control, additional reactions were conducted in multiplex with the universal primers for the 16S rRNA gene of the bacteria together with XV / XK and XV / XK_MOD. Using the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Xpm; Cassava bacterial blight; Molecular diagnosis; Resistance.
Ano: 2019
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42708

Phytosociology of weed in the southwestern Goiás region
Provedor de dados: 1
Autores: Santos, Weverton Ferreira; Procópio, Sérgio de Oliveira; Silva, Alessandro Guerra da; Fernandes, Marcelo Ferreira; Santos, Eduardo Ribeiro dos.
 Roundup Ready® technology adoption and the cultivation of a second crop have changed chemical control methods and weed management in the southwest region of Goiás State, Brazil. Considering these changes, this study aimed to perform a phytosociological survey in areas with glyphosate resistant soybeans and conventional soybeans as the main harvest and sorghum, maize, millet or fallow in succession as the second harvest. A multivariate matrix of the floristic composition was constructed, and the indicator values of the individual number and dry biomass of species were measured. Based on the number of individuals, the species Chamaesyce hirta, Bidens subalternans, and Cissampelos ovolifolia were typical of areas cultivated with glyphosate-resistant soybean,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soybean; Second crop; Crop succession; Resistance; Herbicide.; Fitotecnia.
Ano: 2018
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/33049

Reação de linhagens de feijão-vagem ao Meloidogyne javanica e M. paranaensis em casa-de-vegetação - doi: 10.4025/actasciagron.v33i2.6146
Provedor de dados: 1
Autores: Baida, Fernando Cesar; Universidade Estadual de Londrina; Santiago, Débora Cristina; Universidade Estadual de Londrina; Takahashi, Lúcia Sadayo Assari; Universidade Estadual de Londrina; Athanázio, João Carlos; Universidade Estadual de Londrina; Cadioli, Marina Capparelli; Universidade Estadual de Londrina; Levy, Ricardo Michael; Universidade Estadual de Londrina.
Nematoides formadores de galhas (Meloidogyne sp.) são responsáveis pela baixa produtividade na cultura do feijoeiro, cujas perdas, provocadas por esses patógenos, podem chegar até 90%. O presente estudo teve como objetivo avaliar o comportamento de seis linhagens de feijoeiro (‘Hav 06’, ‘Hav 11’, ‘Hav 28’, ‘Hav 50’, ‘Hav 69’ e ‘Torino’) frente ao parasitismo de M. javanica e de M. paranaensis. As linhagens foram inoculadas com 5.000 ovos e eventuais juvenis dos respectivos nematoides. O delineamento experimental foi inteiramente casualizado, com dez repetições para cada tratamento com os nematoides e dez repetições para testemunha sem inoculação. Quarenta e cinco dias após inoculação, os sistemas radiculares foram coletados, lavados e avaliados quanto à...
Tipo: Pesquisa Aplicada
Palavras-chave: 5.01.02.00-1 nematoide-de-galha; Resistência; Feijoeiro Fitossanidade root-knot nematode; Resistance; Bean.
Ano: 2011
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/6146

Reação de genótipos de milho ao parasitismo de Meloidogyne incógnita raça 1 e a M. paranaensis - DOI: 10.4025/actasciagron.v31i4.761
Provedor de dados: 1
Autores: Levy, Ricardo Michael; UEL; Homechin, Martin; UEL; Santiago, Débora Cristina; UEL; Cadioli, Marina Capparelli; UEL; Baida, Fernando César; UEL.
O uso de híbridos e genótipos de milho resistentes aos nematóides formadores de galhas em sistemas de rotação de culturas mantém sua população em níveis baixos, diminuindo as perdas e possibilitando, posteriormente, o uso de genótipos mais suscetíveis. No presente trabalho, foi avaliada a resistência de 18 genótipos de milho ao parasitismo de M. paranaensis e a M. incógnita raça 1 em casa-de-vegetação. As plantas foram inoculadas com 5.000 ovos e eventuais juvenis dos respectivos nematóides. O delineamento utilizado foi inteiramente ao acaso, com dez repetições para cada tratamento com os nematóides e cinco repetições para a testemunha sem inoculação. Também foi realizada a técnica de coloração das raízes com fucsina ácida, pelo método de Byrd et al....
Palavras-chave: 5.01.02.00-1    Fitossanidade Zea mayz; Nematóide; Resistência; Genótipo Zea may; Nematode; Resistance; Genotype.
Ano: 2009
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/761

Phytosociology of weed in the southwestern Goiás region
Provedor de dados: 1
Autores: Santos, Weverton Ferreira; Procópio, Sérgio de Oliveira; Silva, Alessandro Guerra da; Fernandes, Marcelo Ferreira; Santos, Eduardo Ribeiro dos.
 Roundup Ready® technology adoption and the cultivation of a second crop have changed chemical control methods and weed management in the southwest region of Goiás State, Brazil. Considering these changes, this study aimed to perform a phytosociological survey in areas with glyphosate resistant soybeans and conventional soybeans as the main harvest and sorghum, maize, millet or fallow in succession as the second harvest. A multivariate matrix of the floristic composition was constructed, and the indicator values of the individual number and dry biomass of species were measured. Based on the number of individuals, the species Chamaesyce hirta, Bidens subalternans, and Cissampelos ovolifolia were typical of areas cultivated with glyphosate-resistant soybean,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ciências Agrárias - Agronomia soybean; Second crop; Crop succession; Resistance; Herbicide. Fitotecnia.
Ano: 2018
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/33049

Tolerance of some Grapevine Rootstocks to Tylenchulus Semipenetrans Cobb 1914 in Chile
Provedor de dados: 113
Autores: Aballay,Erwin; Navarro,Alejandra.
Grapevine (Vitis vinifera L.) rootstock resistance to Tylenchulus semipenetrans Cobb 1914 was tested in a field trial carried out in a pre-established grapevine crop. Tested rootstocks included VR O39-16, 420 A, Kober 5BB, 110 Richter, Harmony, Couderc 1613, Ramsey and SO4. Cultivar Cabernet Sauvignon was used as a control. A soil analysis was made at planting in 1995, and a second soil and root analysis was made in 2000 to assess the presence of juveniles and adult females. The most resistant rootstocks were Ramsey and 110 Richter; the others were similar to the control.
Tipo: Journal article
Palavras-chave: Rootstocks; Grapevines; Resistance; Parasitic nematodes.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072005000300010

Design a biomimetic disc using geometric features of the claws
Provedor de dados: 111
Autores: Dehghan Hesar, Hadi; Kalantari, Davood.
This study presents a numerical investigation regarding the stress distribution on the new designed disc harrow using the ANSYS software. A conventional disc, notched disc, and a biomimetic design inspired by the claw of the leatherwing were analyzed in two conventional plowed and unplowed soils and three tillage depths (4, 7 and 10 cm). Stress analysis for all treatments showed that the highest stress was imposed at the disc-stem junction. Meanwhile the highest deformation occurred at the lowest and the most external part of the discs (land line). The results obtained in this study indicated that the maximum stress exerted from tilling soil to discs increases linearly with tillage depth in both plowed and unplowed soils. Given these results, the maximum...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stress; Disk harrow; Finite element; Resistance; Biomimetic.
Ano: 2016
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3561

Susceptibility of new potato varieties to the potato late blight oomycete Phytophthora infestans (Mont.) de Bary in Lithuania
Provedor de dados: 115
Autores: Asakaviciute,Rita; Razukas,Almantas; Jundulas,Juozas.
Potato late blight can completely eliminate this crop in developing countries. Therefore, the objetive of this research was to determine the susceptibility of several Lithuanian potato cultivars to late blight. The experimental design was a randomized split-plot, data were subjected to the ANOVA and the Tukey test was used to verify the significance of differences (p&lt;0.05). Late blight infection in potato groups of various growing cycles lenght was different. The intensity of potato blight spread in various earliness potato cultivars depends not only on their earliness, but also on their biological-mathematical models of late blight prognosis.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Potato; Cultivars; Late blight; Resistance; Ecologic farms.
Ano: 2009
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952009000600008

Antifungal susceptibility of yeasts isolated from anthropogenic watershed
Provedor de dados: 42
Autores: MILANEZI,ANA C.M.; WITUSK,JOÃO P.D.; VAN DER SAND,SUELI T.
Abstract Yeasts are unicellular fungi widespread in the environment, and studies suggest that there is a positive correlation between yeast and polluted aquatic environments. The aim of this study was to analyze the diversity and resistance of yeasts isolated from water samples collected along the Arroio Dilúvio in Porto Alegre to antifungals. Yeast isolates from the Arroio Dilúvio were subjected to susceptibility assays against antifungals using the minimum inhibitory concentration (MIC) test, and amplification of the ITS1-5.8S-IT2 region; in addition, the ITS-5.8S region was sequenced for some of the isolates. The amplification product was subjected to PCR-RFLP, and the restriction profile allowed the construction of a dendrogram. Susceptibility tests...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Yeast; Antifungal; Watershed; Resistance.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100601

2,3,8-Trisubstituted Quinolines with Antimalarial Activity
Provedor de dados: 42
Autores: MARTINEZ,PABLO D.G.; KRAKE,SUSANN H.; POGGI,MAITIA L.; CAMPBELL,SIMON F.; WILLIS,PAUL A.; DIAS,LUIZ C.
ABSTRACT Combination therapy drugs are considered a fundamental way to control malaria as it mimimizes the risk of emergence of resistance to the individual partner drugs. Consequently, this type of therapy constitutes a driving force for the discovery of new drugs with different modes of action, since this will provide options for combining different drugs to achieve the optimum antimalarial treatment. In this context, a 2,3,8-trisubstitued quinoline compound was found in a high throughput screen (HTS) to show an excellent inhibition of P. falciparum NF54 (IC50 = 22 nM) and low cytotoxicity. We performed a detailed evaluation of the substituents to improve the metabolic stability and solubility liabilities of the original hit and identified derivatives...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antimalarial activity; Trisubstituted quinoline; SAR; Resistance.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000301215

The seed coat of Phaseolus vulgaris interferes with the development of the cowpea weevil [Callosobruchus maculatus (F.) (Coleoptera: Bruchidae)]
Provedor de dados: 42
Autores: Silva,Luciana B.; Sales,Maurício P.; Oliveira,Antônia E. A.; Machado,Olga L. T.; Fernandes,Kátia V. S.; Xavier-Filho,José.
We have confirmed here that the seeds of the common bean (Phaseolus vulgaris, L.) do not support development of the bruchid Callosobruchus maculatus (F.), a pest of cowpea [Vigna unguiculata (L.) Walp] seeds. Analysis of the testa (seed coat) of the bean suggested that neither thickness nor the levels of compounds such as tannic acid, tannins, or HCN are important for the resistance. On the other hand, we have found that phaseolin (vicilin-like 7S storage globulin), detected in the testa by Western blotting and N-terminal amino acid sequencing, is detrimental to the development of C. maculatus. As for the case of other previously studied legume seeds (Canavalia ensiformis and Phaseolus lunatus) we suggest that the presence of vicilin-like proteins in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Common bean; Phaseolin (vicilin); Testa; Resistance; Cowpea weevil.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000100006

Prevalence and Fluconazole Susceptibility Profile of Candida spp. Clinical Isolates in a Brazilian Tertiary Hospital in Minas Gerais, Brazil
Provedor de dados: 42
Autores: Neves-Junior,Athayde; Cartágenes-Pinto,Ana Carolina; Rocha,Débora A.S.; Sá,Leandro F. Reis de; Junqueira,Maria de Lourdes; Ferreira-Pereira,Antonio.
Candidiasis has become an important concern for clinical practice, especially with the increasing incidence of immunocompromised patients. In this scenario, the development resistance to fluconazole presents a challenge for treating these opportunistic infections. The aim of this study was to evaluate some epidemiology features of Candidainfections in a Brazilian University Hospital using data, previously unavailable. We observed that 44% of the 93 clinical isolates tested, belonged to Candida albicansspecies and 56% belonged to non-Candida albicansspecies (mainly Candida tropicalis and Candida glabrata). Most strains were isolated from urine samples where C. albicans was predominantly detected. 29 strains presented a fluconazole resistance phenotype and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Candidaspp.; Clinical isolates; Epidemiology; Fluconazole; Resistance.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000301349

Biological parameters of larvae, nymphs, and engorged females of Amblyomma cajennense (Fabricius, 1787) (Acari: Ixodidae) obtained from artificial and successive infestations on Oryctolagus cuniculus (Linnaeus, 1758) (Lagomorpha: Ochotonidae)
Provedor de dados: 45
Autores: Freitas,C.M.V.; Leite,R.C.; Oliveira,P.R.; Fernández,F.C.
The development of acquired resistance to Amblyomma cajennense ticks was evaluated. A total of 18 rabbits were uniformly distributed into three groups named GL, GN, and GA that were submitted to three consecutive infestations with, respectively, larvae, nymphs, and adults of A. cajennense. After the infestations, the parasitic and reproductive parameters of recovered instars were evaluated. A significant reduction of recovery rates of inoculated ticks was observed only after the third infestation of animals in groups GL and GN (P&lt;0.01). The modal day for drop-off of engorged larvae and nymphs increased along the infestations. The recovered engorged nymphs presented a significant reduction of the mean body weight between the first and the third...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tick; Ixodide; Resistance; Immunity; Infestation.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352009000500011

Antimicrobial resistance, diarrheagenic and avian pathogenic virulence genes in Escherichia coli from poultry feed and the ingredients
Provedor de dados: 45
Autores: Rossato,J.M.; Brito,B.G.; Kobayashi,R.K.T.; Koga,V.L.; Sarmiento,J.J.P.; Nakazato,G.; Lopes,L.F.D.; Balsan,L.A.G.; Grassotti,T.T.; Brito,K.C.T.
ABSTRACT Diarrheagenic (DEC) and avian pathogenic Escherichia coli (APEC) are associated with intestinal and extra-intestinal infections (ExPEC), respectively. We aimed to analyze the antimicrobial susceptibility, gene encoding virulence factors associated to DEC and APEC, and phylogenetic classification in E. coli isolated from 320 samples of feed and ingredients. Antimicrobial susceptibility was performed using the disk diffusion method and Multiple Antibiotic Resistance (MAR) Index and Multi-Drug Resistance (MDR) were calculated. Phylogenetic classification was performed on samples harboring DEC and/or APEC virulence-associated genes. A total of 110 E. coli strains were isolated in 15% (49/320) of the evaluated inputs (n=13 vegetable meal; n=33 animal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Poultry production; Animal feed; Antimicrobials; Virulence; Resistance.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352019000601968

Strongyloides venezuelensis infection susceptibility of seven inbred strains of mice
Provedor de dados: 45
Autores: Amarante,A.F.T.; Oliveira-Sequeira,T.C.G.
A trial was carried out to investigate the susceptibility of seven strains of mice to Strongyloides venezuelensis primary and secondary experimental infections, in order to provide the basis for genetic studies about resistance. Twelve six-week-old male inbred mice of the A/J, BALB/c, CBA/J, C3H/Hepos, C57BL/6, DBA/2 and NIH strains were infected s.c. with 2000 infective larvae. The mean worm counts (± SD) in the small intestine six days after infection were, in increasing order: 28 (± 19) in NIH; 647 (± 228) in BALB/c; 709 (± 425) in DBA/2; 731 (± 151) in C3H/Hepos, 801 (± 174) in CBA/J; 1024 (± 267) in C57BL/6 and 1313 (± 483) in A/J. C57BL/6 mice showed the highest fecal egg counts and NIH, the lowest. No eggs in fecal exams or nematodes in small...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Strongyloides venezuelensis; Mice; Inbred; Resistance.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352002000300009

Apoptosis as pathogenic mechanism of infection with vesicular stomatitis virus: Evidence in primary bovine fibroblast cultures
Provedor de dados: 47
Autores: López-Herrera,A.; Ruiz-Sáenz,J.; Góez,Y.P.; Zapata,W.; Velilla,P.A.; Arango,A.E.; Urcuqui-Inchima,S.
To determine whether fibroblasts from Blanco Orejinegro cattle, exhibit any level of resistance to infection against vesicular stomatitis virus (VSV) serotypes Indiana (VSV-I) or New Jersey (VSVNJ), 30 fibroblast cultures were phenotyped to evaluate their resistance/susceptibility. Thirty three % of Blanco Orejinegro fibroblast cultures were classified as very resistant, 50% as resistant, and 17% as susceptible to VSV-I infection, whereas 20% were classified as very resistant, 50% as resistant and 30% as susceptible to VSV-NJ infection. Therefore, there appears to be a large variation in phenotypic polymorphism among the fibroblasts to infection by VSV. To elucidate the mechanisms responsible for this diversity, we searched for a possible relationship...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vesicular stomatitis virus; Apoptosis; Resistance; Bovine fibroblasts (Source: NLM).
Ano: 2009
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452009000200007

Morphological analysis and DNA methylation in Conyza bonariensis L. cronquist (Asteraceae) phenotypes
Provedor de dados: 53
Autores: Paula,Juliana Maria de; Pinto-Maglio,Cecília Alzira Ferreira; Pinto,Luciana Rossini.
ABSTRACT The species Conyza bonariensis (L.) cause losses in agriculture due to their invasive capacity and resistance to herbicides like glyphosate. The species of this genus exhibit phenotypic plasticity, which complicates their identification and characterization. Thus, experiments were performed with 2 extreme C. bonariensis phenotypes (called broad leaf and narrow leaf) in greenhouse conditions and in the laboratory, in order to verify if the morphological differences among these phenotypes are a genetic character or result from environmental effects. In addition to the comparative morphological analysis, assessment of DNA methylation profile was performed to detect the occurrence, or not, of differences in the epigenetic level. The morphological...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phenotypic plasticity; Conyza bonariensis; Resistance; Weeds.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000400480

Use of local rice cultivars as additional differentials to identify pathotypes of Pyricularia oryzae
Provedor de dados: 53
Autores: Silva,Gisele Barata da; Araújo,Leila Garcês de; Lobo,Valácia Lemes da Silva; Prabhu,Anne Sitarama; Rêgo,Marcela Cristiane Ferreira; Paes,Eduardo Tavares; Filippi,Marta Cristina Corsi de.
Eight additional rice cultivars as differentials were selected to identify pathotypes occurring in the Tocantins State. They were BRS Jaburu, BRS Taim, BRS Biguá, BR IRGA-417, Epagri 109, Javaé, Metica-1 and Supremo. These differentials were used in addition to the international set to determine the pathogenic diversity of 193 Pyricularia oryzae isolates collected during 1994-2002 from irrigated rice cultivars. They were conserved in Pyricularia culture collection of Embrapa Rice and Bean Research center. From 193 P. oryzae isolates 38 pathotypes were identified based on leaf blast reactions of international set and 29 pathotypes based on these additional differentials. The predominant pathotypes (TI-1, TG-2, TD-15 and TF-2) were represented by 53% of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pyricularia grisea; Rice leaf blast; Physiologic races; Oryza sativa; Virulence; Resistance; Differential varieties.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052011000400019

Reaction of Arabica coffee progenies derivative from Icatu to Meloidogyne paranaensis
Provedor de dados: 53
Autores: Shigueoka,Luciana Harumi; Sera,Gustavo Hiroshi; Sera,Tumoru; Fonseca,Inês Cristina de Batista; Andreazi,Elder; Carvalho,Filipe Gimenez; Carducci,Fernando Cesar; Ito,Dhalton Shiguer.
ABSTRACT The aim of this study was to evaluate the reaction of Arabica coffee progenies derived from Icatu to Meloidogyne paranaensis. The experiment was conducted under screenhouse conditions at Instituto Agronômico do Paraná (IAPAR) in Londrina, Paraná State, Brazil. Seedlings with three to four pairs of leaves were inoculated with 5,000 M. paranaensis eggs and second-stage juveniles (J2). Four F4 progenies of HN 87609 derived from Icatu H4782-7-925 were evaluated. C. arabica cv. Catuaí Vermelho IAC 81 and C. arabica cv. IPR 100 were susceptible and resistant checks, respectively. The experiment was conducted in a randomized blocks design with 14 replications of one plant per plot. Assessments were performed 120 days after inoculation. The number of eggs...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea; Breeding; Root-knot nematode; Resistance.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052016000200193

Weather, cultivar and density-dependent processes influence on aphid in alfalfa
Provedor de dados: 53
Autores: Silva,Alexandre de Almeida e; Varanda,Elenice Mouro; Rassini,Joaquim Bartolomeu.
It is important to understand the effects of weather, insect density and plant cultivar on insect abundance to predict and prevent crop production loss. The present work investigated the influence of such factors on aphid in alfalfa during one year (short term). Data was collected from September/1997 to August/1998 at Canchin Farm (CCPSE-EMBRAPA), São Carlos, State of São Paulo, Brazil. Weather conditions had, in general, little effect on the variation of aphid populations, but Therioaphis maculata abundance was negatively correlated to humidity. Moreover, high maximum temperatures and low levels of rainfall possible favored T. maculata high abundance on Crioula and P3 cultivars. Therefore, appropriate management of this species is required during hot and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Herbivory; Hemiptera; Medicago sativa; Resistance; Population dynamics.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052007000200012

Effect of the inherent variation in the mineral concentration of alfalfa cultivars on aphid populations
Provedor de dados: 53
Autores: Silva,Alexandre de Almeida e; Varanda,Elenice Mouro; Primavesi,Ana Cândida.
Plants have inherent variability of mineral content which affects their physiology and consequently the herbivorous insects feeding on them. Besides, insects need considerable amounts of potassium, phosphorus and magnesium in their diets, whereas little calcium, sodium and chloride are required. In this study, the inherent variation on mineral (Ca, S, Mg, N, P, K and also C:N ratio) concentrations and aphid (Acyrthosiphon spp., Therioaphis maculata, Aphis craccivora) populations on three alfalfa (Medicago sativa) cultivars (P3; Crioula, the most widely cultivated in Brazil, and CUF 101, an aphid-resistant) were studied between September/1997 and August/1998. A significant variation on mineral concentrations and aphid populations was observed among...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aphididae; Insecta; Nutrients; Resistance; Plant-insect relation.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052005000200010

Development of mango wilt in mango cultivars submitted to salt stress
Provedor de dados: 53
Autores: Vieccelli,Juliana Cristina; Araujo,Leonardo; Lopes,Ueder Pedro; Siqueira,Dalmo Lopes de; Rodrigues,Fabrício de Ávila.
ABSTRACT Mango wilt, caused by Ceratocystis fimbriata, is one of the most important diseases affecting mango yield worldwide. Salt stress can affect host defense responses against pathogens infection. The aim of this study was to evaluate the development of mango wilt in 2 mango cultivars submitted to salt stress. Mango plants from cultivars Tommy Atkins and Ubá, considered to be moderately resistant and resistant to mango wilt, respectively, were grown in plastic pots which contained 20 kg of washed sand and daily irrigated with 3 L of a modified Hoagland solution during 40 days before being submitted to salinization. For this process of salinization, the plants received nutrient solution containing 0, 30, 60, and 90 mmol∙L–1 of sodium chloride (NaCl)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ceratocystis fimbriata; Mangifera indica; Resistance; Salinity; Vascular pathogen.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000300372

Inheritance of resistance to races 69 and 453 of Colletotrichum lindemuthianum in the common bean
Provedor de dados: 52
Autores: Poletine,Juliana P.; Gonçalves-Vidigal,M.C.; Vidigal Filho,Pedro S.; Scapim,Carlos Alberto; Silvério,Lucas; Thomazella,Cláudia.
The cultivars, AB 136 and G 2333 both resistant to Colletotrichum lindemuthianum races 69 and 453, were crossed with the cultivars Michelite and Perry Marrow (susceptible to both races), with Dark Red Kidney and Cornell 49242 (resistant to both races) and F1 and F2 generations were obtained. Plants were inoculated using a spore suspension at 1.2 x 10(6) concentration. The reaction of F1 and F2 populations showed that Dark Red Kidney, Cornell 49242 and AB 136 cultivars had the dominant genes A (Co-1), Are (Co-2) and Co-6, respectively, was conferring resistance to races 69 and 453. The segregation data obtained from F2 populations indicated that G 2333 carried two dominant resistance genes Co-5 gene and another one Co-7 for 69 and 453 races. The dominant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Colletotrichum lindemuthianum; Anthracnose; Resistance.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132000000500006

Assessment of Sugarcane Germplasm ( Saccharum spp. complex) Against Red Rot Pathogen Colletotrichum Falcatum
Provedor de dados: 52
Autores: Singh,Atul; Singh,Pratap; Tiwari,A K; Sharma,B L.
ABSTRACT Red rot, caused by Colletotrichum falcatum Went is the most important disease of sugarcane in India inflicting substantial loss to both cane industry and cane growers. To keep in view the importance of red rot disease of sugarcane, 117 accession of sugarcane germplasm including different Saccharum species and Indian and foreign commercial hybrids were tested against red rot with Cf 07, Cf 08 &amp; Cf 09 (national pathotypes) by plug method of inoculation. Out of 117, 6 were found resistant and 12 were moderately resistant against red rot and rest were moderately susceptible/susceptible/highly susceptible. Theses resistance and moderately resistant accession can be further utilize to produce resistance varieties against the most devastating...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sugarcane; Germplasm; Resistance; Red rot; Plug method.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132017000100203

Resistance profile to antimicrobials of Salmonella spp. isolated from human infections
Provedor de dados: 52
Autores: Delicato,Elaine Regina; Mikcha,Jane Martha Graton; Fernandes,Sueli Aparecida; Pelayo,Jacinta Sanchez.
The purpose of this study was to analyse the profile of antimicrobial resistance among 21 strains of Salmonella isolated from patients with gastroenteritis symptom. It was observed that S. enteritidis was the serotype prevalent. These strains were sensitive to the majority of the antimicrobials tested, however, high resistance was observed in S. typhimurium and S. enterica subsp. enterica serotype 4,5,12:i:-. Surveillance and an efficient monitoring should be priority for the public health for the containment of antimicrobial resistance in foodborne infections.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Salmonella; Humans; Serotypes; Resistance; Antimicrobials.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000200005

Effects of temperature and salinity on the survival rates of coxicerberus ramosae (Albuquerque, 1978), an interstitial isopod of a Sandy Beach on the coast of Brazil
Provedor de dados: 52
Autores: Albuquerque,Elaine Figueiredo; Meurer,Bruno; Netto,Godofredo da Camara Genofre.
The tolerance to the combined effects of temperature and salinity was investigated in the interstitial isopod Coxicerberus ramosae (Albuquerque, 1978), a species of intertidal zone of sandy beaches in Rio de Janeiro, Brazil. The animals were collected on Praia Vermelha Beach. The experiments lasted 24 h and nine salinities and seven temperatures were used for a total of 63 combinations. Thirty animals were tested in each combination. The species showed high survival in most of the combinations. The temperature of 35 ºC was lethal and at 5 ºC, the animals tolerated only a narrow range of salinities. The statistical analyses showed that the effects of temperature and salinity were significant on the survival, which confirmed the euryhalinity and eurythermy...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Interstitial; Isopod; Resistance; Temperature; Salinity; Coxicerberus.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000500015

Identificação de fontes de resistência em cultivares de milho à spodoptera frugiperda (J. E. Smith, 1797) em casa-de-vegetação
Provedor de dados: 52
Autores: Silva,Deise Maria P. da; Oliveira,José V. de; Tabosa,José Nildo; Barros,Reginaldo; Santos,Elton O. dos; Azevedo,Simone S.
Dois experimentos foram estudados em Casa-de-Vegetação, com o objetivo de identificar fontes de resistência em 15 cultivares de milho à Spodoptera frugiperda. Utilizaram-se as cultivares CMS-35, CMS-36, Dina-70, Cargill-525, Pioneer-3210, Pioneer-6875, BR-201, BR-451, AG-106, AG-510, CMS-22, Contimax-322, Jatinã C3 Anão, Cargill-511 e BR-106. As plantas foram infestadas com 30 lagartas recém eclodidas por planta, quando estas apresentavam de 6 a 8 folhas. Após 10 e 14 dias da infestação, foram avaliados os danos através de uma escala visual de notas de 0 a 9. Não houve diferença estatística significativa entre as cultivares para os parâmetros estudados: dano, peso, comprimento e sobrevivência das lagartas. No entanto, as correlações lineares entre o peso x...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Resistance; Zea mays; Foliar Damage; Fall armyworm; Larvae weight.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131999000100014

Oxidative Stress, Chromium-Resistance and Uptake by Fungi: Isolated from Industrial Wastewater
Provedor de dados: 52
Autores: Elahi,Amina; Rehman,Abdul.
ABSTRACT Trichosporon asahii and Rhodotorula mucilaginosa isolated from wastewater effluents were identified as chromium-resistant yeasts. Cr(VI) concentrations at 8 mM and 6 mM were inhibitory for R. mucilaginosa and T. asahii. Remarkably elevated GSH (69.88 ± 10.01) and GSSG (11.24 ± 0.96) was observed under metal stress in T. asahii as compared to R. mucilaginosa GSH (18.95 ± 3.19) and GSSG (3.7 ± 2.74) mM g-1 8 level. Statistical analysis revealed significantly higher GSH/GSSG ratio in both strains. NPSH (29.84 ± 0.54) level in T. asahii was much higher than in R. mucilaginosa (6.05 ± 0.24). Chromate reductase (ChR) was assayed and its activity was optimum at 50°C (pH 6) in T. asahii while R. mucilaginosa showed higher activity at 30°C (pH 7). Activity...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trichosporon asahii; Rhodotorula mucilaginosa; Wastewater; Resistance; Bioaccumulation.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132017000100452

Bacterial Community Associated with Fish and Water from Congonhas River, Sertaneja, Paraná, Brazil
Provedor de dados: 52
Autores: Sousa,José Américo de; Silva-Souza,Ângela Teresa.
A bacteriological study was conducted on fish and water from Congonhas River, Sertaneja (22º58’ S; 50º58’ W), Paraná State, Brazil. From 44% of the analysed fish, bacteria belonging to Pseudomonas, Acinetobacter, Aeromonas, Enterobacteriaceae, Micrococcus, Bacillus and Lactobacillus were isolated. The group most frequently isolated from fish was Aeromonas. In the water, the bacterial groups detected were Pseudomonas, Acinetobacter, Aeromonas, Enterobacteriaceae, Bacillus and Flavobacterium, from which Flavobacterium and Acinetobacter were the most abundant. The numbers of Colony Forming Units per millilitre of water varied from 3.1x10² to 1.0 x 10³. Although a clear pattern was not detected in the susceptibilities/resistances of the isolated strains to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacterial community; Fish; Congonhas River; Aeromonas; Pseudomonas; Resistance.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132001000400007

Successful treatment of vancomycin-resistant enterococcus ventriculitis in a child
Provedor de dados: 55
Autores: Silva,Paulo Sérgio Lucas da; Monteiro Neto,Henrique; Sejas,Lílian Márcia.
Enterococci are an uncommon cause of CNS infection. A 20 month-old boy, diagnosed with hydrocephalus with ventriculoperitoneal shunt and history of lengthy hospitalization and use of wide spectrum antibiotics, was admitted to the pediatric intensive care unit diagnosed with ventriculitis. On the 14th day of empirical antibiotic therapy (vancomycin and meropenem) the child presented fever while the CSF sample culture evidenced vancomycin-resistant Enterococcus faecium. The patient received intravenous linezolid achieving cerebrospinal fluid sterilization. Conclusion: Intravenous linezolid appears to be a safe and effective therapy for vancomycin-resistant enterococcus ventriculoperitoneal shunt infection.
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Vancomycin; Resistance; Treatment.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702007000200027

Antibacterial resistance of community-acquired respiratory tract pathogens recovered from patients in Latin America: results from the PROTEKT surveillance study (1999-2000)
Provedor de dados: 55
Autores: Mendes,C.; Marin,M. E.; Quiñones,F.; Sifuentes-Osornio,J.; Cuilty Siller,C.; Castanheira,M.; Zoccoli,C. M.; López,H.; Súcari,A.; Rossi,F.; Barriga Angulo,G.; Segura,A.J.A.; Starling,C.; Mimica,I.; Felmingham,D.
PROTEKT (Prospective Resistant Organism Tracking and Epidemiology for the Ketolide Telithromycin) is a global surveillance study established in 1999 to monitor antibacterial resistance of respiratory tract organisms. Thirteen centers from Argentina, Brazil and Mexico participat ed during 1999-2000; they collected 1,806 isolates (Streptococcus pneumoniae 518, Haemophilus influenzae 520, Moraxella catarrhalis 140, Staphylococcus aureus 351, S. pyogenes 277). Overall, 218 (42.1%) of the S. pneumoniae isolates had reduced susceptibility to penicillin, 79 (15.3%) were penicillin-resistant and 79 (15.3%) were erythromycin-resistant. Mexico had the highest prevalence of penicillin (76.5%) and erythromycin (31.2%) resistance. Of 77 erythromycin-resistant S....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: PROTEKT; Latin America; Resistance; Respiratory tract infections; Streptococcus pneumoniae; Haemophilus influenzae; Moraxella catarrhalis; Streptococcus pyogenes; Staphylococcus aureus.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702003000100006

Emergence of resistant Candida in neutropenic patients
Provedor de dados: 55
Autores: Nucci,Marcio; Colombo,Arnaldo L.
Problems with resistance to antifungal drugs have emerged due to an increase in the incidence of systemic fungal infections and widespread use of antifungal agents. Accordingly, efforts have been made to develop adequate fungal susceptibility tests. The ideal test should have high intra and inter-laboratory reproducibility, good correlation with the clinical outcome, and should be easy to perform. While no such test has yet been developed, advances have been made. Over the past decade, many reports of fungal resistance have been published, most of them in AIDS patients. Though the frequency of resistant strains is still low in neutropenic cancer patients, and is mostly limited to Candida glabrata and Candida krusei, resistance to Candida albicans has also...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Candida; Resistance; Neutropenic.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702002000300004

Prevalence of resistance-associated mutations in Human Immunodeficiency Virus type 1-positive individuals failing HAART in Rio de Janeiro, Brazil
Provedor de dados: 55
Autores: Varella,Rafael Brandão; Ferreira,Selma Baía; Castro,Márcia Braga de; Tavares,Marisa Dias; Zalis,Mariano Gustavo.
We investigated the occurrence of HIV-1 antiretroviral resistance in individuals failing to respond to highly active antiretroviral therapy (HAART) attended by RENAGENO from 2001-2004. One hundred and seventeen patients were selected for this study; their plasma viral RNA was extracted and the PR and RT genes sequenced to examine subtype, genetic polymorphisms and mutations associated with resistance to antiretroviral drugs. HIV-1 sequence analysis showed that 86/100 (86%) were infected with subtype B, 7/100 (7%) with subtype F and 7/100 (7%) with RT/PR hybrid forms (2 D/B, 2 F/B, 2 B/F and 1 D/F). In 14 (12%) of the samples, the subtype was not determined. The prevalence of resistance mutations was high (93.1%), mainly in the RT gene. The most prevalent...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: HIV-1; HAART; Reverse transcriptase; Protease; Resistance.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702008000500007

Antifungal activities of tacrolimus in combination with antifungal agents against fluconazole-susceptible and fluconazole-resistant Trichosporon asahii isolates
Provedor de dados: 55
Autores: Kubiça,Thaís Felli; Denardi,Laura Bedin; Azevedo,Maria Isabel; Oliveira,Vanessa; Severo,Luiz Carlos; Santurio,Janio Morais; Alves,Sydney Hartz.
ABSTRACT The antifungal activity of tacrolimus in combination with antifungal agents against different fungal species has been previously reported. Here we report the in vitro interactions between tacrolimus and amphotericin B, fluconazole, itraconazole, and caspofungin against 30 clinical isolates of both fluconazole-susceptible and fluconazole-resistant Trichosporon asahii. For these analyses, we used the broth microdilution method based on the M27-A3 technique and checkerboard microdilution method. Tacrolimus showed no activity against T. asahii strains (minimal inhibitory concentrations, MICs &gt; 64.0 µg mL−1). However, a larger synergistic interaction was observed by the combinations tacrolimus + amphotericin B (96.67%) and tacrolimus + caspofungin...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Susceptibility; FK506; Resistance; Synergism.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702016000600539

Use of the D test method to detect inducible clindamycin resistance in coagulase negative staphylococci (CoNS)
Provedor de dados: 55
Autores: Perez,Leandro Reus Rodrigues; Caierão,Juliana; Antunes,Ana Lúcia Souza; d'Azevedo,Pedro Alves.
According to the National Committee for Clinical Laboratory Standards (NCCLS, 2004), a method to evaluate the inducible clindamycin resistance in accordance with an approach of the disks of erythromycin and clindamycin - the D test - has been reported. We analyzed the performance of this method in 200 coagulase negative staphylococci (CoNS) strains obtained from blood cultures of hospitalized patients at a general hospital in Southern Brazil. Twenty-seven clinical isolates with suitable profile (erythromycin-resistant and clindamycin-susceptible) were evaluated for the D test realization. Thus, only 5 CoNS were D test positive. The D test method showed to be simple and an important technique in the detection of inducible clindamycin resistance.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Clindamycin; Resistance; D test.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702007000200002

Methicillin-resistant and methicillin-susceptible community-acquired Staphylococcus aureus infection among children
Provedor de dados: 55
Autores: Gomes,Renata Tavares; Lyra,Ticiana Goyanna; Alves,Noraney Nunes; Caldas,Renilza Menezes; Barberino,Maria-Goreth; Nascimento-Carvalho,Cristiana Maria.
Methicillin-resistant Staphylococcus aureus has emerged as a pathogen associated with community-acquired infections worldwide. We report the spectrum of community-acquired S. aureus infections and compare the patients infected with methicillin-susceptible or methicillin-resistant strains among patients aged &lt;20 years. Overall, 90 cases of community acquired S. aureus were detected in an 11-year period. Clinical and microbiological data were registered. Fifty-nine (66%) patients were male and the median age was two years. The majority (87%) of the patients were hospitalized and chronic underlying illnesses were detected in 27 (30%) cases. Overall, 34 (37.8%) patients had skin/soft tissue infections and 56 (62.2%) patients had deep-seated infection. Four...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antibacterial agents; Community-acquired infection; Methicillin resistance; Staphylococcal infections; Staphylococcus aureus antimicrobial; Resistance.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702013000500010

Evaluation of the genotypic pattern of HIV-1 resistance in AIDS patients failing antiretroviral therapy
Provedor de dados: 55
Autores: Bahia,Fabianna; Pedroso,Célia; Netto,Eduardo Martins; Figueiredo,Ricardo; Pinto Neto,Lauro; Brites,Carlos.
We analyzed the first 96 patients tested for HIV resistance to antiretroviral therapy in three Brazilian states. The HIV-1 reverse transcriptase (RT) and protease (PR) were sequenced by using the ABI ViroSeq system. The drugs previously used for each patient were recorded and correlated with the mutations found in the samples. Viral load (VL) and CD4 count were also recorded. Only one patient had the wild type sequence. The most prevalent mutations were: 184V (59%), 41L (47.9%), 63P (53%), 215Y (50%), 36I (46%), 10I (35%), 67N (42%), 77I (37%), 90M (36%) and 210W (33%). A positive correlation between the number of previously used ARVs and the number of mutations was observed (p&lt;0.05). Associations between mutations and ARV drugs were identified at...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: HIV-1; Mutations; Resistance; Antiretrovirals.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702004000400003

Epidemiological and microbiological aspects of acute bacterial diarrhea in children from Salvador, Bahia, Brazil
Provedor de dados: 55
Autores: Diniz-Santos,Daniel R.; Santana,José S.; Barretto,Junaura R.; Andrade,Maria Goreth M.; Silva,Luciana R.
In the few cases of acute childhood diarrhea that require antimicrobial therapy, the correct choice of the drug depends on detailed previous knowledge of local strains. In order to establish such parameters in our city, we reviewed the results of all 260 positive stool cultures of children between 0 and 15 years of age during two years at a pediatric tertiary care facility in Salvador, Brazil. Bacterial strains had been presumptively identified by culturing in selective media and by biochemical testing, and their antimicrobial susceptibility patterns were automatically detected by the MicroScan Walkaway System. Data about patients' sex and age, monthly distribution of the cases, pathogens isolated and their antimicrobial resistance patterns were recorded....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diarrhea; Antimicrobial; Resistance; Children; Epidemiology.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702005000100013

Tuberculosis: a study of 111 cases in an area of high prevalence in the extreme south of Brazil
Provedor de dados: 55
Autores: Mattos,Ivo Gomes de; Ribeiro,Marta Osório; Netto,Isabel Cristina de O.; d'Azevedo,Pedro Alves.
Tuberculosis is an increasingly important public health problem in developing countries. We studied 111 tuberculosis patients confirmed by mycobacteria isolation between 1998 and 2000 in Rio Grande, in south Brazil. One-hundred-thirteen pulmonary and extrapulmonary clinical materials were examined through culture by the Ogawa-Kudoh method and through smear examination by the Ziehl-Nielsen or Kinyoun methods. The identification of Mycobacterium tuberculosis was done through the usual phenotypical methods. The proportion method (indirect technique) was used to determine the resistance of isolates. The man/woman ratio was 2.6:1, 75% were white, and the group had a mean age of 39.7±12.7. Risk factors were present in 38.7% (34 men and 9 women, p=0.2), with a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tuberculosis; Mycobacterium tuberculosis; Resistance.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702006000300008

Anti-tuberculosis drug resistance in strains of Mycobacterium tuberculosis isolated from patients in a tertiary hospital in Bahia
Provedor de dados: 55
Autores: Matos,Eliana Dias; Lemos,Antônio Carlos Moreira; Bittencourt,Carolina; Mesquita,Cristiane Leite.
Anti-tuberculosis drug resistance, particularly multiresistance, is a crucial issue in the control of tuberculosis (TB). This study estimated the prevalence of primary and acquired anti-tuberculosis drug resistance in strains of Mycobacterium tuberculosis isolated from hospitalized patients, to identify the risk factors for resistance, and to evaluate the its impact on hospital mortality for tuberculosis. Strains of Mycobacterium tuberculosis from 217 patients hospitalized for TB were analyzed. Subjects were recruited sequentially at a TB reference hospital in Salvador, Bahia, Brazil from July 2001 to July 2003. Multiresistant (MR) strains were defined as strains resistant to rifampicin and isoniazid. Of a total of 217 strains isolated, 41 (19.0%, 95%CI:...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mycobacterium tuberculosis; Tuberculosis; Resistance; Multiresistance; Hospitals; Bahia-Brazil.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702007000300007

Trends and predictors of HIV-1 acquired drug resistance in Minas Gerais, Brazil: 2002–2012
Provedor de dados: 55
Autores: Duani,Helena; Aleixo,Agdemir Waleria; Tupinambás,Unaí.
Abstract Several studies show that the prevalence of multidrug-resistant HIV-1 virus is declining over time. A retrospective cohort study was carried out to evaluate the trends of drug resistance in antiretroviral treatment-exposed individuals in a state of a middle-income country, Minas Gerais, southeast region of Brazil. We analyzed 2115 HIV-1 sequences from 2002 up to 2012, from 52 cities of Minas Gerais. The groups were analyzed according to the definitions: "IAS – 3 class mutations", if ≥1 drug resistance mutation from IAS 2015 list (DRM) was present in each class; "No fully susceptible drugs" as the absence of any fully susceptible drug in Stanford algorithm; and "GSS ≥ 2″, when a maximum calculated GSS (genotypic susceptibility score) was ≥2 or ≥3,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: HIV; Antiretroviral; Resistance; Genotyping; Epidemiology.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702017000200148

Antibiotics produced by Streptomyces
Provedor de dados: 55
Autores: Procópio,Rudi Emerson de Lima; Silva,Ingrid Reis da; Martins,Mayra Kassawara; Azevedo,João Lúcio de; Araújo,Janete Magali de.
Streptomyces is a genus of Gram-positive bacteria that grows in various environments, and its shape resembles filamentous fungi. The morphological differentiation of Streptomyces involves the formation of a layer of hyphae that can differentiate into a chain of spores. The most interesting property of Streptomyces is the ability to produce bioactive secondary metabolites, such as antifungals, antivirals, antitumorals, anti-hypertensives, immunosuppressants, and especially antibiotics. The production of most antibiotics is species specific, and these secondary metabolites are important for Streptomyces species in order to compete with other microorganisms that come in contact, even within the same genre. Despite the success of the discovery of antibiotics,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Streptomyces; Antibiotics; Resistance; Infection.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702012000500011

Susceptibility rates in Latin American nations: report from a regional resistance surveillance program (2011)
Provedor de dados: 55
Autores: Jones,Ronald N.; Guzman-Blanco,Manuel; Gales,Ana C.; Gallegos,Belisario; Castro,Aura Lucia Leal; Martino,Marines Dalla Valle; Vega,Silvio; Zurita,Jeannete; Cepparulo,Mario; Castanheira,Mariana.
OBJECTIVE: To establish a resistance (R) surveillance program monitoring antimicrobial susceptibility patterns in Latin America (LATAM; Argentina [ARG], Brazil [BRA], Chile, Colombia [CBA], Costa Rica, Ecuador [ECU], Guatemala [GUA], Mexico [MEX], Panama [PAN], Peru, and Venezuela [VEN]). METHODS: In 2011, 4979 organisms were collected from 11 nations (20 laboratories) for susceptibility testing in a central laboratory design. Antimicrobials were tested by CLSI methods and results interpreted by CLSI and EUCAST breakpoints. Most common Gram-positive (Staphylococcus aureus [SA, 921], other staphylococci [CoNS; 299], enterococci [218], Streptococcus pneumoniae [SPN; 182], β-haemolytic streptococci [115]) and Gram-negative (E. coli [EC; 644], Klebsiella spp....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Latin America; Surveillance; Resistance; ESBL; Β-Lactamases.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702013000600009

Distribution of erm genes and low prevalence of inducible resistance to clindamycin among staphylococci isolates
Provedor de dados: 55
Autores: Coutinho,Vivian de Lima Spode; Paiva,Rodrigo Minuto; Reiter,Keli Cristine; de-Paris,Fernanda; Barth,Afonso Luis; Machado,Alice Beatriz Mombach Pinheiro.
INTRODUCTION: Resistance to macrolides, lincosamides and streptogramins B (MLS B antibiotics) in staphylococci may be due to modification in ribosomal target methylase encoded by erm genes. The expression of MLS B resistance lead to three phenotypes, namely constitutive resistance (cMLS B), inducible resistance (iMLS B), and resistance only to macrolides and streptogramins B (MS B). The iMLS B resistance is the most difficult to detect in the clinical laboratory. OBJECTIVE: This study investigated the expression of MLS B resistance and the prevalence of the erm genes among 152 clinical isolates of Staphylococcus aureus and coagulase-negative Staphylococcus (CNS) from Hospital de Clínicas de Porto Alegre. METHODS: Primary MLS B resistance was detected by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Staphylococcus; Resistance; Erm genes; Macrolides.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702010000600004

Salmonella enterica serovar typhi: molecular analysis of strains with decreased susceptibility and resistant to ciprofloxacin in india from 2001-2003
Provedor de dados: 55
Autores: Capoor,Malini R.; Nair,Deepthi; Aggarwal,Pushpa; Mathys,Vanessa; Dehem,Marie; Bifani,Pablo Juan.
Chromosomally-mediated reduced susceptibility to ciprofloxacin narrows the therapeutic options in enteric fever. We made a molecular comparison of clinical isolates of fluoroquinolone-resistant strains of Salmonella enterica serotype Typhi from January 2001 to May 2003; 178 isolates were subjected to antimicrobial susceptibility testing by the Kirby-Bauer method of disk diffusion, and agar dilution was used to determine the minimum inhibitory concentration (MIC) to ciprofloxacin. Nalidixic-acid resistant strains (NARST) were observed in 51% of the isolates, of which 98.9% had decreased susceptibility (MIC&gt;0.125-1µg/mL) to ciprofloxacin. A single strain (4 µg/mL) was resistant to ciprofloxacin and double mutations were found in the gyrA gene (76...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Salmonella enterica; S.Typhi; Ciprofloxacin; Resistance.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702007000400011

Resistance patterns, prevalence, and predictors of fluoroquinolones resistance in multidrug resistant tuberculosis patients
Provedor de dados: 55
Autores: Ahmad,Nafees; Javaid,Arshad; Sulaiman,Syed Azhar Syed; Ming,Long Chiau; Ahmad,Izaz; Khan,Amer Hayat.
Abstract  Background Fluoroquinolones are the backbone of multidrug resistant tuberculosis treatment regimens. Despite the high burden of multidrug resistant tuberculosis in the country, little is known about drug resistance patterns, prevalence, and predictors of fluoroquinolones resistance among multidrug resistant tuberculosis patients from Pakistan.  Objective To evaluate drug resistance patterns, prevalence, and predictors of fluoroquinolones resistance in multidrug resistant tuberculosis patients.  Methods This was a cross-sectional study conducted at a programmatic management unit of drug resistant tuberculosis, Lady Reading Hospital Peshawar, Pakistan. Two hundred and forty-three newly diagnosed multidrug resistant tuberculosis patients...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fluoroquinolones; MDR-TB; Resistance; Private.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702016000100041

Comparison of clinical characteristics between healthcare-associated pneumonia and community-acquired pneumonia in patients admitted to secondary hospitals
Provedor de dados: 55
Autores: Lee,Jong Hoo; Kim,Yee Hyung.
BACKGROUND: Since healthcare-associated pneumonia (HCAP) is heterogeneous, clinical characteristics and outcomes are different from region to region. There can also be differences between HCAP patients hospitalized in secondary or tertiary hospitals. This study aimed to evaluate the clinical characteristics of HCAP patients admitted into secondary community hospitals. METHODS: This was a retrospective study conducted in patients with HCAP or community-acquired pneumonia (CAP) hospitalized in two secondary hospitals between March 2009 and January 2011. RESULTS: Of a total of 303 patients, 96 (31.7%) had HCAP. 42 patients (43.7%) resided in a nursing home or long-term care facility, 36 (37.5%) were hospitalized in an acute care hospital for &amp;gt; 2 days...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Health care; Pneumonia; Antibiotics; Mortality; Resistance.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702012000400002

Genotype testing and antiretroviral resistance profiles from HIV-1 patients experiencing therapeutic failure in northeast Brazil
Provedor de dados: 55
Autores: Medeiros,Melissa Soares; Arruda,Érico Antônio Gomes; Guerrant,Richard Littleton; Brown,Christopher; Hammarskjold,Marie-Louise; Rekosh,David; Lima,Aldo Ângelo Moreira.
Genotype testing for HIV-1 drug resistance is useful for selecting antiretroviral drug regimens for patients experiencing therapeutic failure, but the optimal means for interpreting the test results is unknown because many HIV-1 protease and reverse transcriptase (RT) mutations contribute to drug resistance. This study identified common combinations of resistance mutations related to antiretroviral resistance profiles. From April 2002 to March 2004, 101 protease and RT sequences were determined for HIV-1 isolates from patients who were failing antiretroviral therapy. The resistance profile was evaluated using the Stanford Database program. Male patients predominated (76.2%), the median age was 38 years, the average CD4 count was 279.21 cells/mm³ and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genotype test mutation HIV-1 protease reverse transcriptase antiretrovirals; Resistance.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702007000400003

Isolation, pathogenicity and disinfection of Staphylococcus aureus carried by insects in two public hospitals of Vitória da Conquista, Bahia, Brazil
Provedor de dados: 55
Autores: Oliveira,Pollianna S.; Souza,Simone G.; Campos,Guilherme B.; Silva,Danilo C.C. da; Sousa,Daniel S.; Araújo,Suerda P.F.; Ferreira,Laiziane P.; Santos,Verena M.; Amorim,Aline T.; Santos,Angelita M.O.G.; Timenetsky,Jorge; Cruz,Mariluze P.; Yatsuda,Regiane; Marques,Lucas M.
Currently, hospital infection is a serious public health problem, and several factors may influence the occurrence of these infections, including the presence of insects, which are carriers of multidrug-resistant bacterial species. The aim of this study was to isolate staphylococci carried by insects in two public hospitals of Vitoria da Conquista, Bahia and to identify the resistance profile, pathogenicity and efficacy of disinfection of the premises. A total of 91 insects were collected in 21 strategic points of these hospitals, and 32 isolated strains ofStaphylococcus aureus were isolated. Based on antibiogram and Minimum Inhibitory Concentration results, 95% of these strains were susceptible to oxacillin. These strains were also evaluated for the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insects; Staphylococcus aureus; Resistance; Virulence factors; Disinfection.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702014000200129

A pharmacodynamic strategy to optimize empirical antibiotic therapy for gram-negative bacteria in a Brazilian Intensive Care Unit
Provedor de dados: 55
Autores: Kiffer,Carlos R.V.; Kuti,Joseph L.; Mendes,Caio M.F.; Oplustil,Carmen P.; Amarante,Jorge B.; Biancalana,Maria L.; Xavier,Nelson; Nicolau,David P.
Pharmacodynamic analyses were proposed to determine optimal empirical antibiotic therapy against Gram-negative bacteria isolated in a Brazilian ICU. Due to high resistance rates, standard regimens of cefepime, ciprofloxacin, meropenem, and piperacillin/tazobactam were not able to attain significant bactericidal CFR. Prolonged infusion of meropenem achieved 88% CFR, making it a possible empirical regimen in this ICU until susceptibilities become available. Still, even through administration of high dose prolonged infusions, 12.0% of simulated subjects did not achieve bactericidal exposure, suggesting that combination therapy would frequently be required in this setting. In conclusion, we recommend that in the presence of identified resistance problems among...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pharmacodynamics; Resistance; Carbapenem; Meropenem.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702007000200001

Impact of the number of failed therapeutic regimes on the development of resistance mutations to HIV-1 in northeast Brazil
Provedor de dados: 55
Autores: Medeiros,Melissa Soares; Arruda,Érico Antônio Gomes; Guerrant,Richard Littleton; Brown,Christopher Cooley; Lima,Aldo Ângelo Moreira.
Highly-potent antiretroviral therapy is necessary to avoid viral replication in HIV patients; however, it can favor the appearance of resistance mutations. The mutations 41L, 67N, 70R, 210W, 215Y/F, 219E/Q, 44D and 118I are defined as nucleoside analogous mutations (NAMs), because they affect the efficacy of all nucleoside reverse transcriptase inhibitors (NRTI). The mutation most frequently associated with non-nucleoside reverse transcriptase inhibitors (NNRTIs) is 103N. 33W/F, 82A/F/L/T, 84V and 90M are called protease inhibitor resistance-associated mutations (PRAM), because they are associated with resistance to several protease inhibitors (PI). This study evaluated the development of resistance mutations and examine the susceptibility of HIV with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mutation; HIV-1; Failure therapy; Antiretrovirals; Resistance.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702007000500002

Extensive variation in drug-resistance mutational profile of Brazilian patients failing antiretroviral therapy in five large Brazilian cities
Provedor de dados: 55
Autores: Brites,Carlos; Pinto-Neto,Lauro; Medeiros,Melissa; Nunes,Estevão; Sprinz,Eduardo; Carvalho,Mariana.
Abstract  Background Development of drug-resistance mutations is the main cause of failure in antiretroviral therapy. In Brazil, there is scarce information on resistance pattern for patients failing antiretroviral therapy.  Objectives To define the HIV mutational profile associated with drug resistance in Brazilian patients from 5 large cities, after first, second or further failures to antiretroviral therapy.  Methods We reviewed genotyping results of 1520 patients failing therapy in five Brazilian cities. Frequency of mutations, mean number of active drugs, viral susceptibility to each antiretrovirals drug, and regional differences were assessed.  Results Mean time of antiretrovirals use was 22.7 ± 41.1 months. Mean pre-genotyping viral load was 4.2 ±...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: HIV; Resistance; Brazil; Mutations.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702016000400323

Clinical failure of vancomycin treatment of Staphylococcus aureus infection in a tertiary care hospital in southern Brazil
Provedor de dados: 55
Autores: Lutz,Larissa; Machado,Adão; Kuplich,Nadia; Barth,Afonso Luís.
We describe a case of clinical failure of vancomycin treatment of Staphylococcus aureus infection and the laboratory characteristics of the organism in a tertiary referral university hospital in southern Brazil. An 11-month-old male patient presented with pneumonia and S. aureus was isolated from his respiratory tract. Initial treatment with oxacillin and gentamicin was ineffective. Vancomycin was added to the regimen as the patient worsened, but after the 30th day of vancomycin treatment S. aureus was isolated from the blood. This isolate had a minimum inhibitory concentration (MIC) for vancomycin of 4 µg/mL. After pre-incubation with vancomycin the isolate displayed an increase in the expression of vancomycin resistance and colonies grew in the presence...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: S. aureus; Resistance; Vancomycin.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702003000300008

Susceptibility of S. pneumoniae to various antibiotics among strains isolated from patients and healthy carriers in different regions of Brazil (1999-2000)
Provedor de dados: 55
Autores: Rossi,F.; Andreazzi,D.; Maffucci,M.; Pereira,A A.
Resistance of microbes to commonly used antibiotics became a major concern at the end of the last century. Because Streptococcus pneumoniae is the most common pathogen in respiratory infections, we conducted microbiological assessment of drug susceptibility patterns among strains collected from two different population groups: 1) adult and pediatric patients (375 isolates) with different infections, and 2) healthy children in day care centers (&lt; 5 years old; 350 isolates). High level resistance to penicillin was not identified in either group. Intermediate resistance levels were similar in both groups (adults: 9.9%; children: 9.2%). The Central West region of Brazil tended to have lower susceptibility of S.pneumoniae from infected adults and children to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: S. pneumoniae; Resistance; Susceptibility; Respiratory infection; Antibiotics; Brazil.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702001000600003

Late emergence of A594V and L595W mutations related to ganciclovir resistance in a patient with HCMV retinitis and long-term HIV progression
Provedor de dados: 56
Autores: Slavov,S.N.; Vilar,F.C.; Wagatsuma,V.M.D.; Santana,R.C.; Machado,A.A.; Fonseca,B.A.L. da; Kashima,S.; Covas,D.T.
The emergence of ganciclovir (GCV) resistance during the treatment of human cytomegalovirus (HCMV) infection is a serious clinical challenge, and is associated with high morbidity and mortality. In this case report, we describe the emergence of two consecutive mutations (A594V and L595W) related to GCV resistance in a patient with HCMV retinitis and long-term HIV progression after approximately 240 days of GCV use. Following the diagnosis of retinitis, the introduction of GCV did not result in viral load reduction. The detected mutations appeared late in the treatment, and we propose that other factors (high initial HCMV load, previous GCV exposure, low CD4+ cell count), in addition to the presence of resistance mutations, may have contributed to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Human cytomegalovirus; HCMV; Ganciclovir; Resistance; AIDS.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2015000900777

Collateral methotrexate resistance in cisplatin-selected murine leukemia cells
Provedor de dados: 56
Autores: Bhushan,A.; Hacker,M.P.; Tritton,T.R.
Resistance to anticancer drugs is a major cause of failure of many therapeutic protocols. A variety of mechanisms have been proposed to explain this phenomenon. The exact mechanism depends upon the drug of interest as well as the tumor type treated. While studying a cell line selected for its resistance to cisplatin we noted that the cells expressed a &amp;gt;25,000-fold collateral resistance to methotrexate. Given the magnitude of this resistance we elected to investigate this intriguing collateral resistance. From a series of investigations we have identified an alteration in a membrane protein of the resistant cell as compared to the sensitive cells that could be the primary mechanism of resistance. Our studies reviewed here indicate decreased tyrosine...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Methotrexate transport; Resistance; Cisplatin; Leukemia; Phosphorylation.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999000700005

Enterococcus gallinarum carrying the vanA gene cluster: first report in Brazil
Provedor de dados: 56
Autores: Camargo,I.L.B.C.; Barth,A.L.; Pilger,K.; Seligman,B.G.S.; Machado,A.R.L.; Darini,A.L.C.
In 2000, Enterococcus faecalis resistant to vancomycin was first reported at a tertiary hospital in Porto Alegre, southern Brazil. The resistance spread to other hospitals and surveillance programs were established by hospital infection committees to prevent the spread of vancomycin-resistant enterococci. In February 2002, an isolate initially identified at the genus level as Enterococcus was obtained by surveillance culture (rectal swab) from a patient admitted to a hospital for treatment of septic arthritis in the shoulder. The isolate proved to be resistant to vancomycin by the disc diffusion method and confirmed by an E-test resulting in a minimal inhibitory concentration of  &gt; or = 256 µg/ml. This isolate was sent to a reference laboratory...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Enterococcus gallinarum; VanA phenotype; Vancomycin; Resistance.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2004001100012

The expression of the ACTH receptor
Provedor de dados: 56
Autores: Elias,L.L.K.; Clark,A.J.L.
Adrenal glucocorticoid secretion is regulated by adrenocorticotropic hormone (ACTH) acting through a specific cell membrane receptor (ACTH-R). The ACTH-R is a member of the G protein superfamily-coupled receptors and belongs to the subfamily of melanocortin receptors. The ACTH-R is mainly expressed in the adrenocortical cells showing a restricted tissue specificity, although ACTH is recognized by the other four melanocortin receptors. The cloning of the ACTH-R was followed by the study of this gene in human diseases such as familial glucocorticoid deficiency (FGD) and adrenocortical tumors. FGD is a rare autosomal recessive disease characterized by glucocorticoid deficiency, elevated plasma ACTH levels and preserved renin/aldosterone secretion. This...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: ACTH receptor; Resistance; Mutation; Transfection.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2000001000015

New multilocus sequence typing of MRSA in São Paulo, Brazil
Provedor de dados: 56
Autores: Carmo,M.S.; Inoue,F.; Andrade,S.S.; Paschoal,L.; Silva,F.M.; Oliveira,V.G.S.; Pignatari,A.C.C.
An increased incidence of nosocomial and community-acquired infections caused by methicillin-resistant Staphylococcus aureus (MRSA) has been observed worldwide. The molecular characterization of MRSA has played an important role in demonstrating the existence of internationally disseminated clones. The use of molecular biology methods in the surveillance programs has enabled the tracking of MRSA spread within and among hospitals. These data are useful to alert nosocomial infection control programs about the potential introduction of these epidemic clones in their areas. Four MRSA blood culture isolates from patients hospitalized at two hospitals in the city of São Paulo, Brazil, were analyzed; one of them was community acquired. The isolates were...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Methicillin-resistant Staphylococcus aureus; Molecular sequence typing; Resistance; Molecular typing.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2011001000006

Epidermal growth factor receptor (EGFR) mutations in lung cancer: preclinical and clinical data
Provedor de dados: 56
Autores: Jorge,S.E.D.C.; Kobayashi,S.S.; Costa,D.B.
Lung cancer leads cancer-related mortality worldwide. Non-small-cell lung cancer (NSCLC), the most prevalent subtype of this recalcitrant cancer, is usually diagnosed at advanced stages, and available systemic therapies are mostly palliative. The probing of the NSCLC kinome has identified numerous nonoverlapping driver genomic events, including epidermal growth factor receptor (EGFR) gene mutations. This review provides a synopsis of preclinical and clinical data on EGFR mutated NSCLC and EGFR tyrosine kinase inhibitors (TKIs). Classic somatic EGFR kinase domain mutations (such as L858R and exon 19 deletions) make tumors addicted to their signaling cascades and generate a therapeutic window for the use of ATP-mimetic EGFR TKIs. The latter inhibit these...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mutation; Lung cancer; Non-small-cell lung cancer; EGFR; EGFR inhibitor; Precision therapies; Resistance.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2014001100929

Antimicrobial susceptibility among Enterococcus isolates from the city of Porto Alegre, RS, Brazil
Provedor de dados: 58
Autores: d'Azevedo,Pedro Alves; Dias,Cícero Armídio Gomes; Lemos,Sibele Krebs; Bittencourt,José Augusto Ferreira; Teixeira,Lúcia Martins.
Resistance to several classes of antimicrobial agents is a remarkable characteristic of enterococcal strains increasingly reported worldwide. Information about strains isolated in the southern region of Brazil is still limited. In this study, a total of 455 consecutive enterococcal isolates recovered from patients living in Porto Alegre, Brazil, were identified at species level and evaluated for their antimicrobial susceptibilities by agar diffusion testing. The most frequent species was E. faecalis (92.8%), followed by E. faecium (2.9%), E. gallinarum (1.5%), E. avium (1.1%), E. hirae (0.7%), E. casseliflavus (0.4%), E. durans (0.4%), and E. raffinosus (0.2%). According to the results of disk tests 62.0% of the strains were resistant to tetracycline,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Enterococcal; Antimicrobial susceptibility; Resistance.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822004000200005

Carbapenem-resistant Pseudomonas aeruginosa: association with virulence genes and biofilm formation
Provedor de dados: 58
Autores: Gonçalves,Iara Rossi; Dantas,Raquel Cristina Cavalcanti; Ferreira,Melina Lorraine; Batistão,Deivid William da Fonseca; Gontijo-Filho,Paulo Pinto; Ribas,Rosineide Marques.
Abstract Pseudomonas aeruginosa is an opportunistic pathogen that causes frequently nosocomial infections, currently becoming more difficult to treat due to the various resistance mechanisms and different virulence factors. The purpose of this study was to determine the risk factors independently associated with the development of bacteremia by carbapenem-resistant P. aeruginosa, the frequency of virulence genes in metallo-β-lactamases producers and to evaluate their ability to produce biofilm. We conducted a case–control study in the Uberlândia Federal University – Hospital Clinic, Brazil. Polymerase Chain Reaction was performed for metallo-β-lactamases and virulence genes. Adhesion and biofilm assays were done by quantitative tests. Among the 157 strains...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pseudomonas aeruginosa; Resistance; Metallo-β-lactamases; Virulence; Biofilm.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822017000200211

Characterization of Mycobacterium tuberculosis complex isolated from iranian and afghani patients by spoligotyping method
Provedor de dados: 58
Autores: Ramazanzadeh,Rashid; Farnia,Parisa; Amirmozafari,Nour.
Designing newer drugs, vaccines, and diagnostic techniques is dependent on better understanding of M. tuberculosis virulence mechanism. In this study the prevalence of pcaA gene was determined in M. tuberculosis strains typed by spoligotyping. The associated risk factors among patients with different nationalities residing in Iran were also determined. The isolated M. tuberculosis strains have been characterized by performing susceptibility tests against four first-line antituberculosis drugs and were then subjected to spoligotyping characterization. PCR was used for detection of pcaA gene and its nucleotide sequence was also determined. Spoligotyping of M. tuberculosis strains resulted in 140 different patterns. One hundred twenty two (87.1%) of these...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tuberculosis; Resistance; Drugs; Spoligotyping; PcaA.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822009000200019

Susceptibility of Arcobacter butzleri to heavy metals
Provedor de dados: 58
Autores: Otth,Laura; Solís,Gabriela; Wilson,Myra; Fernández,Heriberto.
The susceptibility of 50 strains of Arcobacter butzleri isolated from chicken liver [12], mussels [18], river water [6] and bovine [5], duck [2] and pelicans [7] feces to mercury (Hg), chromium (Cr), silver (Ag), nickel (Ni), cobalt (Co), iron (Fe), manganese (Mn), molybdenum (Mo) and lead (Pb) was determined.All the strains were resistant to Mo, Mn, Ni, Co, Pb and Fe and susceptible to Hg, Ag and Cr. MIC values showed high variability, indicating a non homogeneous behavior among the strains.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arcobacter butzleri; Heavy metals; Resistance.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822005000300015

Community-associated methicillin-resistant Staphylococcus aureus in non-outbreak skin infections
Provedor de dados: 58
Autores: Bonesso,Mariana Fávero; Marques,Silvio Alencar; Camargo,Carlos Henrique; Fortaleza,Carlos Magno Castelo Branco; Cunha,Maria de Lourdes Ribeiro de Souza da.
The aim of this study was to determine the prevalence of Staphylococcus aureus and risk factors for the acquisition of MRSA (Methicillin Resistant Staphylococcus aureus) as the main cause of skin and soft tissue infections. S. aureus were characterized for the presence of PVL, TSST-1 and mecA genes. SCCmec typing was carried out in mecA positive strains and PFGE was performed only in these strains. During the study period, 127 outpatients attending a dermatology clinical the Botucatu Medical School, a regional tertiary hospital in Botucatu, Sao Paulo, Brazil, were diagnosed with active skin infections. A total 66 (56.9%) S. aureus strains were isolated. The methicillin resistance gene mecA was detected in seven (10.6%) S. aureus strains. The SCCmec types...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Staphylococcus aureus; Resistance; Skin infections; Virulence; Epidemiology.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822014000400034

Changes in antimicrobial susceptibility of commonly clinically significant isolates before and after the interventions on surgical prophylactic antibiotics (SPAs) in Shanghai
Provedor de dados: 58
Autores: Wang,Su; Han,Li-Zhong; Ni,Yu-Xing; Zhang,Yi-Bo; Wang,Qun; Shi,Da-Ke; Li,Wen-Hui; Wang,Yi-Chen; Mi,Chen-Rong.
Abstract Surveillances and interventions on antibiotics use have been suggested to improve serious drug-resistance worldwide. Since 2007, our hospital have proposed many measures for regulating surgical prophylactic antibiotics (carbapenems, third gen. cephalosporins, vancomycin, etc.) prescribing practices, like formulary restriction or replacement for surgical prophylactic antibiotics and timely feedback. To assess the impacts on drug-resistance after interventions, we enrolled infected patients in 2006 (pre-intervention period) and 2014 (post-intervention period) in a tertiary hospital in Shanghai. Proportions of targeted pathogens were analyzed: methicillin-resistant Staphylococcus aureus (MRSA), vancomycin-resistant Enterococcus spp. (VRE),...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Surgical prophylactic antibiotics; Intervention; Resistance; Nosocomial infection.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822018000300552

Use of green fluorescent protein labeled non-tuberculous mycobacteria to evaluate the activity quaternary ammonium compound disinfectants and antibiotics
Provedor de dados: 58
Autores: Cortesia,Claudia; Bello,Teresita; Lopez,Gustavo; Franzblau,Scott; Waard,Jacobus de; Takiff,Howard.
Abstract Although infections with NonTuberculous Mycobacteria have become less common in AIDS patients, they are important opportunistic infections after surgical procedures, likely because they are ubiquitous and not efficiently killed by many commonly used disinfectants. In Venezuela there have recently been many non-tuberculous mycobacteria soft tissue infections after minor surgical procedures, some apparently related to the use of a commercial disinfectant based on a Quaternary Ammonium Compound. We studied the activity of this and other quaternary ammonium compounds on different non-tuberculous mycobacteria by transforming the mycobacteria with a dnaA-gfp fusion and then monitoring fluorescence to gauge the capacity of different quaternary ammonium...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Quaternary Ammonium Compounds (QACs); Disinfectants; NonTuberculous Mycobacteria (NTM); Resistance; Post-surgical infections.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822017000100151

Prevalence of Candida spp. in cervical-vaginal samples and the in vitro susceptibility of isolates
Provedor de dados: 58
Autores: Brandolt,Tchana Martinez; Klafke,Gabriel Baracy; Gonçalves,Carla Vitola; Bitencourt,Laura Riffel; Martinez,Ana Maria Barral de; Mendes,Josiara Furtado; Meireles,Mário Carlos Araújo; Xavier,Melissa Orzechowski.
Abstract Vulvovaginal candidiasis (VVC) is an infection of the genital mucosa caused by different species of the genus Candida. Considering the lack of data on this topic in the south of Brazil, this study aimed to assess the prevalence of Candida spp. in the cervical-vaginal mucosa of patients treated at a university hospital in southern Rio Grande do Sul, as well as the etiology and the susceptibility of the isolates against fluconazole, itraconazole, miconazole and nystatin. Samples were collected at the gynecology clinic of the Federal Hospital of the University of Rio Grande, and the isolates were identified using phenotypic and biochemical tests. The susceptibility analysis was performed according to the CLSI M27-A2 protocol. Of the 263 patients...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vulvovaginal candidiasis; Antifungal; Susceptibility; Resistance.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822017000100145

In vitro antimicrobial susceptibility of staphylococci isolated from canine pyoderma in Rio de Janeiro, Brazil
Provedor de dados: 58
Autores: Penna,B.; Varges,R.; Medeiros,L.; Martins,G.M.; Martins,R.R.; Lilenbaum,W.
The study aimed to determine the etiology and antimicrobial resistance of staphylococci isolated from canine pyoderma. Samples were obtained from dogs with pyoderma and isolates were identified by biochemical reactions and tested for susceptibility to 15 antimicrobials. Thirty nine staphylococci isolates were obtained, and S. pseudintermedius was the most frequent (47.4%). All isolates showed resistance to at least one drug and 77.1% were multiresistant. The most effective drug was oxacillin. The study reports the alarming antimicrobial resistance of Staphylococcus isolated from canine pyoderma samples.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Staphylococci; Resistance; Antimicrobial agents; Dog; Pyoderma.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822009000300011

Ethambutol resistance of indigenous Mycobacterium tuberculosis isolated from human patients
Provedor de dados: 58
Autores: Nazir,Taha; Rasool,Muhammad Hidayat; Hameed,Abdul; Ahmad,Bashir; Qureshi,Javed Anver.
The present study was conducted to find out the ethambutol resistance pattern of indigenous isolates of Mycobacterium tuberculosis from Tuberculosis diagnosed human patients. A total of 172 specimens were collected from six different sources and comprised of 84.9% sputum, 10.5% pus and 4.7% bronchial washings. There were 70.9% males and 29.1% females with 84.30% pulmonary and 15.69% extra-pulmonary tuberculosis. The Mycobacterium tuberculosis isolates collected from primary culture were further studied to determine their pattern and level of resistance. The inoculums were prepared using 0.5 Mac Farland turbidity standards. Five different concentration of ethambutol were used in Lowenstein Jensen (LJ) medium i.e. 2μg/ml, 4μg/ml, 6μg/ml, 8μg/ml and 10μg/ml...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ethambutol; Mycobacterium tuberculosis; Resistance; Lowenstein Jensen medium; Human patients.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822010000400026

Extended-spectrum beta-lactamases in Klebsiella spp and Escherichia coli obtained in a Brazilian teaching hospital: detection, prevalence and molecular typing
Provedor de dados: 58
Autores: Freitas,Ana Lúcia Peixoto de; Machado,Denise Pires; Soares,Fabiana da Silva Correa; Barth,Afonso Luís.
His study was performed to compare the methods of detection and to estimate the prevalence of extended-spectrum beta-lactamases (ESBL) among Klebsiella spp and E.coli in a university hospital in southern Brazil. We also used a molecular typing method to evaluate the genetic correlation between isolates of ESBL K.pneumoniae. Production of ESBL was investigated in 95 clinical isolates of Klebsiella spp and Escherichia coli from Hospital de Clínicas de Porto Alegre, using Kirby-Bauer zone diameter (KB), double-disk diffusion (DD), breakpoint for ceftazidime (MIC CAZ), increased zone diameter with clavulanate (CAZ/CAC) and ratio of ceftazidime MIC/ceftazidime-clavulanate MIC (MIC CAZ/CAC). Molecular typing was performed by DNA macrorestriction analysis...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: ESBL; Klebsiella; Resistance; Molecular typing.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822003000400012

In vitro antimicrobial resistance of Pseudomonas aeruginosa isolated from canine otitis externa in Rio de Janeiro , Brazil
Provedor de dados: 58
Autores: Penna,B.; Thomé,S.; Martins,R.; Martins,G.; Lilenbaum,W.
Isolates of Pseudomonas aeruginosa (167) were obtained from 528 samples of canine otitis externa, identified by biochemical reactions and tested for susceptibility to 10 antimicrobials. The most effective drug was ciprofloxacin. The study reports alarming resistance among P. aeruginosa isolated from canine otitis externa samples in Rio de Janeiro, Brazil.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pseudomonas aeruginosa; Resistance; Antimicrobial agents; Dog; Otitis externa.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000400027

Detection of virulence and β-lactamase encoding genes in Enterobacter aerogenes and Enterobacter cloacae clinical isolates from Brazil
Provedor de dados: 58
Autores: Azevedo,Paola Aparecida Alves; Furlan,João Pedro Rueda; Oliveira-Silva,Mariana; Nakamura-Silva,Rafael; Gomes,Carolina Nogueira; Costa,Karen Regina Carim; Stehling,Eliana Guedes; Pitondo-Silva,André.
ABSTRACT Enterobacter cloacae and E. aerogenes have been increasingly reported as important opportunistic pathogens. In this study, a high prevalence of multi-drug resistant isolates from Brazil, harboring several β-lactamase encoding genes was found. Several virulence genes were observed in E. aerogenes, contrasting with the E. cloacae isolates which presented none.
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Enterobacter cloacae; Enterobacter aerogenes; Virulence; Resistance.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822018000500224

Carriage frequency, phenotypic and genotypic characteristics of Staphylococcus aureus isolated from dialysis and kidney tranplant patients at a hosptial in northern Paraná
Provedor de dados: 58
Autores: Giarola,Luciana Borges; Santos,Rosiane Ribeiro dos; Tognim,Maria Cristina Bronharo; Borelli,Sueli Donizete; Bedendo,João.
The objective of the present study was to determine the frequency of Staphylococcus aureus nasal carriage among dialysis and kidney transplant patients, to identify the antimicrobial resistance profile of these strains and to verify their genetic profiles with the RW3A primer. The study included 159 individuals, comprising 111 dialysis and 48 kidney transplant patients. Of the 48 transplant patients, 75% were positive for S. aureus, whereas 49% of the 111 dialysis patients were carriers. Two samples yielded conflicting results for oxacillin sensitivity between the disk diffusion and minimum inhibitory concentration (MIC) assays: both were sensitive by the disk diffusion assay and resistant by MIC (4 μg/ml). In the antibiogram by disk diffusion, ten samples...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Staphylococcus aureus; Nasal carrier; Resistance; MecA gene; Genetic typing.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822012000300011

Identification, antimicrobial resistance and genotypic characterization of Enterococcus spp. isolated in Porto Alegre, Brazil
Provedor de dados: 58
Autores: Bender,Eduardo André; Freitas,Ana Lúcia Peixoto de; Reiter,Keli Cristine; Lutz,Larissa; Barth,Afonso Luís.
In the past two decades the members of the genus Enterococcus have emerged as important nosocomial pathogens worldwide. In the present study, we evaluated the antimicrobial resistance and genotypic characteristics of 203 Enterococcus spp. recovered from different clinical sources from two hospitals in Porto Alegre, Rio Grande do Sul, Brazil. The species were identified by conventional biochemical tests and by an automated system. The genetic diversity of E. faecalis presenting high-level aminoglycoside resistance (HLAR) was assessed by pulsed-field gel electrophoresis of chromosomal DNA after SmaI digestion. The E. faecalis was the most frequent specie (93.6%), followed by E. faecium (4.4%). The antimicrobial resistance profile was: 2.5% to ampicillin,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Enterococcus; Resistance; HLAR; PFGE.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822009000300035

Effect of sulfonylurea tribenuron methyl herbicide on soil Actinobacteria growth and characterization of resistant strains
Provedor de dados: 58
Autores: Rachedi,Kounouz; Zermane,Ferial; Tir,Radja; Ayache,Fatima; Duran,Robert; Lauga,Béatrice; Karama,Solange; Simon,Maryse; Boulahrouf,Abderrahmane.
ABSTRACT Repeated application of pesticides disturbs microbial communities and cause dysfunctions on soil biological processes. Granstar® 75 DF is one of the most used sulfonylurea herbicides on cereal crops; it contains 75% of tribenuron-methyl. Assessing the changes on soil microbiota, particularly on the most abundant bacterial groups, will be a useful approach to determine the impact of Granstar® herbicide. For this purpose, we analyzed Actinobacteria, which are known for their diversity, abundance, and aptitude to resist to xenobiotic substances. Using a selective medium for Actinobacteria, 42 strains were isolated from both untreated and Granstar® treated soils. The number of isolates recovered from the treated agricultural soil was fewer than that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacterial diversity; Actinobacteria; Granstar® herbicide; Resistance; 16S rRNA genes.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822018000100079

Glycopeptides susceptibility among enterococci isolated from a poultry farm in São Paulo, Brazil (1996/1997)
Provedor de dados: 58
Autores: Leme,Ivani Lúcia; Ferreira,Antonio José Piantino; Bottino,José Américo; Pignatari,Antonio Carlos C.
Enterococci resistance to glycopeptides was evaluated em Brazilian poultry fed with feed supplemented with avoparcin as growth promoter. The susceptibility to the glycopeptides avoparcin, teicoplanin and vancomycin was determined for 217 enterococci isolated from cloacal swabs (one swab per bird) in tests and controls groups. Tests group comprised three groups (A, B and C) of Hubbard broiler-chickens 14, 21 and 35 days old, respectively. These birds were from one single farm, with a common feed source supplemented with avoparcin (10 mg/kg of feed). Controls groups (1 and 2) comprised 25 and 42 days old broilers, respectively, obtained from the Faculty of Veterinary Medicine’s aviary (University of São Paulo) where avoparcin was never used. No glycopeptide...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycopeptides; Avoparcin; Vancomycin; Resistance; Enterococcus.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822000000100013

Disinfectant-resistant bacteria in Buenos Aires city hospital wastewater
Provedor de dados: 58
Autores: Nuñez,L.; Moretton,J.
Large quantities of disinfectants are used in hospitals, externally on human skin or to eliminate microorganisms from inanimate objects. After use, residual quantities of these products reach the wastewater, exposing the bacteria that survive in hospital wastewaters to a wide range of biocides that could act as a selective pressure for the development of resistance. Increasing attention has been directed recently to the resistance of bacteria to disinfectants. The aim of this paper was to determine the disinfectant bacterial resistance pattern of the microflora released to the urban sewer system by hospital effluents. The characterization of the waste water microflora was performed by determination of the CFU of heterotrophic bacteria, fecal indicator...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Disinfectant; Resistance; Hospital effluent.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822007000400012

Evaluation of bacteriocin-producing Lactobacillus sakei 1 against Listeria monocytogenes 1/2a growth and haemolytic activity
Provedor de dados: 58
Autores: Martinez,Rafael C.R.; De Martinis,Elaine C.P.
Bacteriocin-producing Lactobacillus sakei 1 was cultivated in Brain-Heart Infusion broth (24 h at 25ºC). The culture supernatant was neutralized, filter sterilized and used to test the activity of bacteriocin against Listeria monocytogenes 1/2a, at 8ºC and 15ºC. Non-bacteriocinogenic Lactobacillus sakei ATCC 15521 was used as a negative control. L. monocytogenes 1/2a was inoculated in culture supernatant medium from L. sakei 1 and L. sakei ATCC 15521 and the listerial populations were determined after 0, 5 and 10 days. The bacteriocin production was quantified as arbitrary units per mL (AU/mL) using agar antagonism test. Additionally, to investigate if L. monocytogenes virulence pattern could be changed after bactericion exposure, the ability of L....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Listeria monocytogenes; Lactobacillus sakei; Bacteriocins; Virulence; Resistance.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822005000100016

Antibiotic resistance genes detected in the marine sponge Petromica citrina from Brazilian coast
Provedor de dados: 58
Autores: Laport,Marinella Silva; Pontes,Paula Veronesi Marinho; Santos,Daniela Silva dos; Santos-Gandelman,Juliana de Fátima; Muricy,Guilherme; Bauwens,Mathieu; Giambiagi-deMarval,Marcia; George,Isabelle.
ABSTRACT Although antibiotic-resistant pathogens pose a significant threat to human health, the environmental reservoirs of the resistance determinants are still poorly understood. This study reports the detection of resistance genes (ermB, mecA, mupA, qnrA, qnrB and tetL) to antibiotics among certain culturable and unculturable bacteria associated with the marine sponge Petromica citrina. The antimicrobial activities elicited by P. citrina and its associated bacteria are also described. The results indicate that the marine environment could play an important role in the development of antibiotic resistance and the dissemination of resistance genes among bacteria.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microbes; Natural hotspots; Porifera; Resistance; Rio de Janeiro.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822016000300617

Antimicrobial resistance and virulence gene profiles in P. multocida strains isolated from cats
Provedor de dados: 58
Autores: Ferreira,Thais Sebastiana Porfida; Felizardo,Maria Roberta; Gobbi,Debora Dirani Sena de; Moreno,Marina; Moreno,Andrea Micke.
Cats are often described as carriers of Pasteurella multocida in their oral microbiota. This agent is thought to cause pneumonia, conjunctivitis, rhinitis, gingivostomatitis, abscess and osteonecrosis in cats. Human infection with P. multocida has been described in several cases affecting cat owners or after cat bites. In Brazil, the cat population is approximately 21 million animals and is increasing, but there are no studies of the presence of P. multocida in the feline population or of human cases of infection associated with cats. In this study, one hundred and ninety-one healthy cats from owners and shelters in São Paulo State, Brazil, were evaluated for the presence of P. multocida in their oral cavities. Twenty animals were positive for P....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cat; Pasteurela multocida; Virulence genes; Resistance; Isolation.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822015000100271

Employing pharmacokinetic and pharmacodynamic principles to optimize antimicrobial treatment in the face of emerging resistance
Provedor de dados: 58
Autores: Santos Filho,Lauro; Kuti,Joseph L.; Nicolau,David P.
Antimicrobial efficacy in vivo is not exclusively defined by the activity of an antibiotic as determined in the in vitro susceptibility test. Knowledge of the pharmacokinetics and pharmacodynamics of antimicrobials and all phenomena occurring between antimicrobial agents and microorganisms is imperative. The pharmacodynamic (PD) parameters most often used in studies of antibiotic effect include the following relationships: the maximum free concentration (fCmax) to minimum inhibitory concentration (MIC) ratio, the free area under the curve (fAUC/MIC) ratio and the duration of time the free concentration exceeds the MIC (fT&gt;MIC). Utilization of known pharmacokinetic/ pharmacodynamic surrogate relationships should help to optimize treatment outcome,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antibiotic; Bacteria; Pharmacodynamics; Resistance.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822007000200001

Coffee resistance to the main diseases: leaf rust and coffee berry disease
Provedor de dados: 61
Autores: Silva,Maria do Céu; Várzea,Victor; Guerra-Guimarães,Leonor; Azinheira,Helena Gil; Fernandez,Diana; Petitot,Anne-Sophie; Bertrand,Benoit; Lashermes,Philippe; Nicole,Michel.
Considerable success has been obtained in the use of classical breeding to control economically important plant diseases, such as the coffee leaf rust and the coffee berry disease (CBD). There is a strong consensus that growing genetically resistant varieties is the most appropriate cost effective means of managing plant diseases and is one of the key components of crop improvement. It has also been recognized that a better knowledge of both, the pathogens and the plant defence mechanisms will allow the development of novel approaches to enhance the durability of resistance. After a brief description of concepts in the field of plant disease resistance, we attempt to give a view of the research progress on coffee leaf rust and CBD concerned with the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea; Colletotrichum kahawae; Hemileia vastatrix; Coffee breeding; Resistance.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202006000100010

Antimicrobial susceptibility of Clostridium difficile isolated from animals and humans in Brazil
Provedor de dados: 65
Autores: Silva,Rodrigo Otávio Silveira; Oliveira Junior,Carlos Augusto; Diniz,Amanda Nádia; Alves,Guilherme Guerra; Guedes,Roberto Maurício Carvalho; Vilela,Eduardo Garcia; Lobato,Francisco Carlos Faria.
The objective of this study was to evaluate antimicrobial susceptibility in Clostridium difficile strains isolated from animals and humans in Brazil. The 54 C. difficile strains used were isolated from stool samples from piglets (n=16), dogs (n=13), humans (n=13), foals (n=8) calves (n=2), an ocelot (n=1) and a maned wolf (n=1). Antimicrobial susceptibility was determined using the serial plate agar dilution method for penicillin, florfenicol, oxytetracycline, erythromycin, vancomycin, metronidazole and tylosin. The C. difficile strains assessed were susceptible to metronidazole and vancomycin. Florfenicol resistance was rarely observed; 52 (96.4%) strains were sensitive to this antimicrobial. Five (9.3%), five (9.3%), 14 (25.9%) and 20 (37.0%) strains...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nosocomial diarrhea; Pseudomembranous colitis; Resistance.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782014000500013

Antimicrobial susceptibility and pathogenicity of Escherichia coli strains of environmental origin
Provedor de dados: 65
Autores: Carvalho,Daiane; Finkler,Fabrine; Grassotti,Tiela Trapp; Kunert Filho,Hiran Castagnino; Lima,Francisco Esmaile de Sales; Soares,Beatriz Dugaich; Rossato,Juliana Marzari; Cunha,Augusto César da; Brito,Kelly Cristina Tagliari de; Brito,Benito Guimarães de.
The study aimed to evaluate the antimicrobial susceptibility of 109 samples of Escherichia coli (E. coli) of environmental origin and to characterize these isolates according to the degree of pathogenicity in vivo, verifying a possible relationship between this variable and susceptibility to the active principles tested. The isolates were subjected to disc diffusion test to 14 antibiotics. From 16.5% to 90% of the samples were sensitive; 1 - 28.5% showed intermediate degree of susceptibility and between 9 to 78% of E. coli analyzed were resistant. The highest resistance percentages were seen in the class of quinolones and tetracyclines (&amp;gt;75%), and for sensitivity in the class of amphenicols (68.8%). By inoculating 1- day - old chicks, the isolates...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Escherichia coli; Resistance; Antimicrobials; Pathogenicity; Poultry.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782015000701249

Host suitability of soybean and corn genotypes to the root lesion caused by nematode under natural infestation conditions
Provedor de dados: 65
Autores: Rios,Anderli Divina Ferreira; Rocha,Mara Rúbia da; Machado,Alan Soares; Ávila,Kássia Aparecida Garcia Barbosa; Teixeira,Renato Andrade; Santos,Leonardo de Castro; Rabelo,Lilian Rosana Silva.
ABSTRACT: Among the nematode management strategies, genetic resistance is one of the most appropriate and desirable. However, resistant soybean and corn genotypes resistant to Pratylenchus brachyurus are not available up to the moment. The objective of this study was to evaluate the host suitability of 50 soybean and 38 corn genotypes to P. brachyurus under natural infestation. Soybean genotypes BRSGO Chapadões, BRSGO Paraíso, M-Soy 7211 RR, M-Soy 8008 RR, Emgopa 313 RR, M-Soy 8411, BRSGO Juliana RR, Emgopa 316 RR, BRSGO Luziânia RR and TMG 103 RR, and corn genotype Agromem 30A06 reduced the nematode population during the evaluation period.
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Glycine max; Zea mays; Pratylenchus brachyurus; Resistance.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000400580

COMPETITIVE ABILITY OF WHEAT IN ASSOCIATION WITH BIOTYPES OF Raphanus raphanistrum L. RESISTANT AND SUSCEPTIBLE TO ALS-INHIBITOR HERBICIDES
Provedor de dados: 64
Autores: Costa,Leandro Oliveira da; Rizzardi,Mauro Antônio.
The occurrence of Raphanus raphanistrum ALS herbicide-resistant in wheat crops causes crop yield losses, which makes it necessary to understand the factors that influence the interference of this weed to develop safer management strategies. This study aimed to evaluate the competitive ability of wheat in coexistence with biotypes of R. raphanistrum that are resistant (R biotype) and susceptible (S biotypes) to ALS herbicides and to determine whether there are differences in the competitiveness of these biotypes. The experiments were conducted in a greenhouse using a completely randomized design with four replications. The treatments were placed in pots and arranged in replacement series for three experiments (1 - wheat with the R biotype; 2 - wheat with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Resistance; Competition; Replacement series.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542015000200121

Feeding non-preference of the corn leaf aphid Rhopalosiphum maidis (Fitch, 1856) (Hemiptera: Aphididae) to corn plants (Zea mays L.) treated with silicon
Provedor de dados: 64
Autores: Moraes,Jair Campos; Goussain,Márcio Marcos; Carvalho,Geraldo Andrade; Costa,Rosane Rodrigues.
A tactic for control to corn leaf Rhopalosiphum maidis (Fitch, 1856) would be the use of resistant materials, but, for not being a key pest of the crop, there are not yet corn genotypes availables with those characteristics. So, it was aimed in this work to evaluate the effect of silicon on the aphid's development on corn plants. Preference tests with leaves detached from the plants and on corn plants were accomplished. Its was found that the treatments where silicon was applied to the soil plus a foliar sprayed fertilization or through two foliar applications were the ones which contained a lower number of aphids, increasing the resistance of leaves and making the feeding of those insects difficult. In general, the results showed that silicon affected the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Resistance; IPM.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542005000400007