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Search Results: 1 - 10 of 51124 matches for " Luis Roberto;Schwan "
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Incidence and distribution of filamentous fungi during fermentation, drying and storage of coffee (Coffea arabica L.) beans
Silva, Cristina Ferreira;Batista, Luis Roberto;Schwan, Rosane Freitas;
Brazilian Journal of Microbiology , 2008, DOI: 10.1590/S1517-83822008000300022
Abstract: the objective of this work was to isolate and characterize filamentous fungi present in different stages of harvest, fermentation, drying and storage of coffee beans processed by natural method. the cherries were hand-picked and then placed on a cement drying platform where they remained until reached 11% of humidity. microbial counts were found in all samples during fermentation and drying of the coffee beans. counts of fungi in the coffee cherries collected from the tree (time 0) were around 1.5 x 103 cfu/g. this number increased slowly during the fermentation and drying reaching values of 2 x 105 cfu/g within 22 days of processing. two hundred and sixty three isolates of filamentous fungi were identified. the distribution of species during fermentation and drying was very varied while there was a predominance of aspergillus species during storage period. the genera found were pestalotia (4), paecelomyces (4), cladosporium (26), fusarium (34), penicillium (81) and aspergillus (112) and comprised 38 different species.
Inibi??o in vitro de fungos toxigênicos por Pichia sp. e Debaryomyces sp. isoladas de frutos de café (Coffea arabica)
Ramos, Darlê Martins Barros;Silva, Cristina Ferreira;Batista, Luís Roberto;Schwan, Rosane Freitas;
Acta Scientiarum. Agronomy , 2010, DOI: 10.4025/actasciagron.v32i3.3361
Abstract: coffee is a national product with great importance for the brazilian economy. the excessive use of pesticides led to research for alternative forms, such as biological control. the objective of this work was to assess the potential antagonistic effect of yeast in dual-culture with filamentous fungi. isolates of debaryomyces hansenii (uflacf 889 and uflacf 847) and pichia anomala (uflacf 710 and uflacf 951) species were inoculated (103 to 106 células ml-1) with three species of filamentous fungi, aspergillus ochraceus, a. parasiticus and penicillium roqueforti (103 to 106 spores ml-1). the assessment of mycelial growth and counting of spores was done for 21 days. it was observed that the isolated ufla cf 889 attained, on average, the greatest inhibitory effect on the spore production of a. ochraceus (inhibition of 82%) and p. roqueforti (74%). the isolated ufla cf 710 inhibited the spore production, on average, 60 and 75.6% of a. ochraceus and p. roqueforti, respectively. the fungus a. parasiticus was the most resistant to inhibition by yeasts. the mycelial growth was not inhibited by the presence of yeast in dual-culture. it could be concluded that yeast in dual-cultiure with filamentous fungi were able to inhibit the production of spores and potentially reduce the spread of this fungus during coffee processing.
Inibi o in vitro de fungos toxigênicos por Pichia sp. e Debaryomyces sp. isoladas de frutos de café (Coffea arabica) = In vitro inhibition of toxigenic filamentous fungi by Pichia sp. and Debaryomyces sp. isolates from coffee (Coffea arabica) fruits
Darlê Martins Barros Ramos,Cristina Ferreira Silva,Luís Roberto Batista,Rosane Freitas Schwan
Acta Scientiarum : Agronomy , 2010,
Abstract: O café é um produto nacional com grande express o para a economia brasileira. O uso excessivo de fungicidas tem levado a pesquisas sobre formas alternativas como o controle biológico. Objetivou-se avaliar o potencial antag nico de leveduras em co-cultivo com fungos filamentosos. Isolados das espécies Debaryomyces hansenii (UFLACF 889 e UFLACF 847) e Pichia anomala (UFLACF 710 e UFLACF 951) foram inoculados (103 a 106 células mL-1) com três espécies de fungos filamentosos, Aspergillus ochraceus, A. parasiticus e Penicillium roqueforti (103 a 106 esporos mL-1). A avalia o do crescimento micelial e a contagem de esporos foram realizadas durante 21 dias. Observou-se que o isolado UFLACF 889 apresentou, em média, maior efeito inibitório na produ o de esporos de A. ochraceus (inibi o de 82%) e P. roqueforti (74%). O isolado UFLACF 710 inibiu a produ o deesporos, em média, 60 e 75,6% de A. ochraceus e P. roqueforti, respectivamente. A. parasiticus foi o fungo mais resistente à inibi o pelas leveduras. O crescimento micelial n o foi inibido pela presen a da levedura em co-cultivo. Portanto, pode-se concluir que leveduras em cultivo pareado com fungos filamentosos s o capazes de inibir a produ o de esporos e, potencialmente, diminuir a dissemina o destes fungos no processamento de café. Coffee is a national product with great importance for the Brazilian economy. The excessive use of pesticides led to research for alternative forms, such as biological control. The objective of this work was to assess the potential antagonistic effect of yeast in dualculture with filamentous fungi. Isolates of Debaryomyces hansenii (UFLACF 889 and UFLACF 847) and Pichia anomala (UFLACF 710 and UFLACF 951) species were inoculated (103 to 106 células mL-1) with three species of filamentous fungi, Aspergillus ochraceus, A. parasiticus and Penicillium roqueforti (103 to 106 spores mL-1). The assessmentof mycelial growth and counting of spores was done for 21 days. It was observed that the isolated UFLA CF 889 attained, on average, the greatest inhibitory effect on the spore production of A. ochraceus (inhibition of 82%) and P. roqueforti (74%). The isolated UFLA CF 710 inhibited the spore production, on average, 60 and 75.6% of A. ochraceus and P. roqueforti, respectively. The fungus A. parasiticus was the most resistant to inhibition by yeasts. The mycelial growth was not inhibited by the presence of yeast in dual-culture. It could be concluded that yeast in dual-cultiure with filamentous fungi were able to inhibit the production of spores and potentially reduce the spread of
Size composition and sex ratio of Anadara tuberculosa and Anadara similis in a mangrove reserve from the northwest of Ecuador
Flores,Luis; Licandeo,Roberto;
Revista de biología marina y oceanografía , 2010, DOI: 10.4067/S0718-19572010000300021
Abstract: shell length frequency distribution (slfd) and sex ratio of a subpopulation of the mangrove cockles anadara tuberculosa and anadara similis were analyzed from natural beds in the cayapas-mataje ecological mangrove reserve, ecuador. the slfd was different between sexes for both species; females were larger than males. subpopulations of a. tuberculosa and a. similis were dominated by females throughout the year. the overall sex ratio was 2.6:1 (female: male), although with variations in the monthly samples, from 1.2:1 to 5.9:1 in a. tuberculosa and 1.9:1 to 5.3:1 in a. similis. possibly, these results may be due to differential growth rate between sexes and environmental factors along the year.
La muerte voluntaria en Yucatán durante el porfiriato
Canto Valdes, Luis Roberto;
Secuencia , 2012,
Abstract: this articie on suicide in yucatán during the porfiriato seeks to understand the preconceptions about suicides. this paper's contribucion lies in the fact that it incerprets the way these characters were perceived and described on the basis of articles in the 19th century press and judicial records analyzed in connection with the industrial boom at the time. suicides commonly elicited feelings of pity but before expressing this grief, efforts were made to find a reason that would explain why people had killed themselves. in this respect, the paper analyzes the cases of voluntary death in light of the modernizing effect of the time in order to obtain a better understanding of how this type of events occurred.
Medición "in situ" de la permeabilidad al aire del hormigón: status quo
Ebensperger,Luis; Torrent,Roberto;
Revista ingeniería de construcción , 2010, DOI: 10.4067/S0718-50732010000300003
Abstract: the authors have been involved in the creation, preliminary tests and development of the "torrent method", which is intended to test air permeability in concrete. it's been more than 15 years since such foundational research and, now, this paper presents a review of the evolution and current situation of the method, included in the switzerland standards in 2003. application examples conducted in laboratory and civil works (bridges, tunnels, and so on) are introduced, including data from different countries worldwide. correlations between the air permeability coefficient kt and other durability indicators, such as chloride migration (astm c1202), penetration of water under pressure (en 12390-8) or capillary action are presented. finally the future prospective uses are discussed, as quality control tool for new structures, considering relevant implications they would lead to, as well as the diagnosis on existing structures.
EL ROL DE LOS PADRES EN LA FORMACIóN FUTBOLíSTICA DEL NI O
Luis Roberto Sibaja Quesada
Pensar en Movimiento : Revista de Ciencias del Ejercicio y la Salud , 2003,
Abstract: La vivencia de un ni o al involucrarse en cualquier deporte es condicionada por la mentalidad de sus padres. Frecuentemente, éstos transmiten a sus hijos sus propias motivaciones, frustraciones y sue os truncados. Indudablemente, los padres que no quieren da ar la experiencia deportiva de su hijo y en consecuencia el desarrollo de su personalidad, deben considerar cuidadosamente el sentido que ellos, atribuyen al deporte, su forma de visualizarlo y la manera en que intentan vivir la experiencia deportiva de su ni o. En este período de la vida del ni o es importante darle la posibilidad de realizar sus propias escogencias relacionadas con sus deseos de practicar algún deporte, la función de los padres es apoyarlo y orientarlo con relación a la preferencia del infante, nunca convertirse en una figura presionante que influya tendenciosamente en lo que el ni o quiere hacer con su tiempo recreacional o deportivo.
Aspectos polémicos, limitaciones y perspectivas del estudio de las arterias coronarias por tomografía computarizada. Controversial features, limitations and perspectives of coronary arteries study by computerized axial tomography.
Luis Roberto Llerena Rojas
Revista Cubana de Cardiología y Cirugía Cardiovascular , 2010,
Abstract:
Raíz mesoamericana: Octavio Paz, Efraín Huerta y Frida Kahlo
Luis Roberto Vera
Impossibilia : Revista Internacional de Estudios Literarios , 2012,
Abstract: Mesoamerican heritage is resilient in Mexican culture. Contemporary visual arts andpoetry are marked not only by their insertion in the avant-garde but also by an acute consciousness of theactuality and by the presence of their original past. This article reflects on the cultural bridges –offered byworks which are as much re-creations no less than a critical approach– based on the Mesoamericanideological constructions, and their manifestations (both archaeological and contemporary) through thecomparative study of Pre-Columbian images within Frida Kahlo’s painting as well as in the poetry ofEfraín Huerta and Octavio Paz.
Estudios de laboratorio para el control de Ceratitis capitata (Wiedmann) (Diptera: Tephritidae) (Mosca del Mediterráneo) con Beauveria bassiana
Luis Porras,Roberto Lecuona
Agronomía Costarricense , 2008,
Abstract: Con el objetivo de seleccionar cepas promisorias de Beauveria bassiana para el control de Ceratitis capitata, se realizó, en condiciones de laboratorio, una serie de ensayos empleando la mosca adulta como estado vulnerable al parasitismo por el hongo entomopatógeno. Para la selección se utilizó una concentración de 5x109 CV.m-2 del hongo. Se determinó la CL90, la sobrevivencia media (SM), la compatibilidad con insecticidas, además de ensayos de producción con el hongo. Así como la compatibilidad de los insecticidas Mercaptotion 100% CE (Lupara ) y Dimetoato 40% CE (Sistémico Icona) con las cepas seleccionadas. Se cuantificó la viabilidad de los conidios en platos de Petri pos-tratamiento, a 50, 100 y 200% de la dosis comercial del insecticida. A partir de 7 cepas evaluadas (mortalidad 97-14%) fueron seleccionadas la Bb 26, la Bb 259, la Bb 132, y la Bb 238. Los valores de CL90 estuvieron entre 1x109 y 3,8 x1011 CV.m-2 (Bb 238 y Bb 26, respectivamente). La SM de las cepas varió de 7-12 días (Bb 238 y Bb 26, respectivamente). La mayor producción fue de 7x109 UFC.mg-1 y 20,7 g.conidios.kg-1 de arroz (Bb 26). Todas las cepas fueron compatibles con Mercaptotion y la Bb 132 presentó la mayor compatibilidad con el Dimetoato. En conclusión, los ensayos en el laboratorio permitieron seleccionar cepas de B. bassiana con potencial para controlar C. capitata
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