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Id: lil-613048
Autor: Acuña Gonzalez, Paola Andrea; Angel Garcia, Lisvet Sofía; Borray Montoya, Elizabeth; Corrales, Lucia Constanza; Sanchez, Ligia Consuelo.
Título: Aislamiento e identificación de microorganismos del género Methanococcus y Methanobacterium de cuatro fuentes de Bogotá, DC / Isolation and identification of methanococcus and methanobacterium microorganisms from four different sources in Bogota, DC
Fonte: NOVA publ. cient;6(10):156-161, jul.-dic. 2008. tab, ilus.
Idioma: es.
Resumo: Las bacterias metanogénicas obtienen su energía mediante la producción metabólica de gas metano, utilizando sustratos como dióxido de carbono, acetato y sustratos de metilo a través de procesos de hidrólisis y acetogenesis y son esenciales en la degradación anaerobia de la materia orgánica en la naturaleza. El propósito de esta investigación fue aislar bacterias metanogénicas para conservarlas en la colección de cultivos de la Universidad Colegio Mayor de Cundinamarca. El muestreo se realizó por duplicado de cuatro fuentes ubicadas en Bogotá D.C, Colombia, las cuales ofrecían las características ambientales para su desarrollo. El procedimiento incluyó la toma de la muestra en ambiente anaerobio, aislamiento en medios selectivos e identificación por observación de las características microscópicas con coloración de Gram y de características macroscópicas en los medios selectivos y verificación de producción de metano mediante prueba piloto. Los resultados permitieron evidenciar la presencia de bacterias de los géneros Methanococcus y Methanobacterium a partir de las fuentes seleccionadas para el estudio. Se concluyó que el mejor método para la conservación de estos géneros es la congelación con la adición de agentes reductores y glicerol como criopreservante.
Descritores: Bactérias Anaeróbias
Criopreservação
Metano
Mathanococcus
Simbiose
-Colômbia
Responsável: CO242.1 - Biblioteca


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Morais, Mauro Batista de
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Id: biblio-1057205
Autor: Santos, Alexandre Neves da Rocha; Soares, Ana Cristina Fontenele; Oliveira, Ricardo Palmero; Morais, Mauro Batista de.
Título: The impact of small intestinal bacterial overgrowth on the growth of children and adolescents / Impacto do sobrecrescimento bacteriano no intestino delgado sobre o peso e a estatura de crianças e adolescentes
Fonte: Rev. Paul. Pediatr. (Ed. Port., Online);38:e2018164, 2020. tab.
Idioma: en.
Resumo: ABSTRACT Objective: To evaluate the association between small intestinal bacterial overgrowth (SIBO) and weight and height impairment in children and adolescents with gastroenterology diseases. Methods: Observational and retrospective study. All 162 patients aged less than 19 years old who underwent breath test in search of SIBO between 2011 and 2016 were studied. Breath test was collected after the intake of 10 grams of lactulose. The concentration of hydrogen and methane was measured for 180 minutes after the beginning of the test by 12i QuinTronMicroLyzer device. Results: SIBO was identified in 51 (31.5%) patients. There was no difference between the age of those with (mean=8.7y.o; 25th and 75th percentile: 4.6 and 11.3) and without (mean=7.9y.o 25th and 75th percentile: 4.8 and 12.2) SIBO (p=0.910). There was no association between gender and SIBO (male 26.3% vs. female 36.3%, p=1.00). A lower median of height-for-age Z score (mean=-1.32; 25th and 75th percentile: -2.12 and -0.08 vs. mean=-0.59; 25th and 75th percentile: -1.57 and 0.22; p=0.04) was demonstrated in children with SIBO when compared with children without it. There was no difference between the BMI-for-age Z score of patients with (mean=-0.48) and without SIBO (mean=-0.06) (p=0.106). The BMI of patients with SIBO (median=15.39) was lower than of those without it (median=16.06); however, the statistical analysis was not significant (p=0.052). The weight-for-age Z score was lower in patients with SIBO (mean=-0.96) than in those without SIBO (mean=-0.22) (p=0.02) Conclusions: Children and adolescents with SBIO associated with diseases of the gastrointestinal tract have lower weight and height values.

RESUMO Objetivo: Avaliar a existência de associação entre sobrecrescimento bacteriano no intestino delgado (SBID) e comprometimento de peso e estatura em crianças e adolescentes com doenças do aparelho digestivo. Métodos: Estudo observacional e retrospectivo em ambulatório de gastroenterologia pediátrica. Foram incluídos todos os 162 pacientes com idade inferior a 19 anos que realizaram teste respiratório para pesquisa de SBID entre 2011 e 2016. O teste respiratório foi realizado após ingestão de dez gramas de lactulose. Foram determinadas as concentrações de hidrogênio e metano em aparelho 12i QuinTron MicroLyzer até 180 minutos após o início do teste respiratório. Resultados: SBID foi caracterizado em 51 (31,5%) dos 162 pacientes. Não houve diferença na idade das crianças com (mediana=8,7 anos; percentil 25-75: 4,6-11,3) e sem (mediana=7,9 anos; percentil 25-75: 4,8-12,2) SBID (p=0,910). Não se observou associação entre SBID e sexo (masculino 27,4% e feminino 36,6%; p=0,283). O escore Z da estatura-idade nos pacientes com SBID (mediana=-1,32; percentil 25-75: -2,12—0,08) foi menor (p=0,040) do que naqueles sem SBID (mediana=-0,59; percentil 25-75: -1,57-0,22). Na comparação do escore Z de índice de massa corpórea-idade não foi observada diferença entre os grupos com (média=-0,489±1,528) e sem (média=-0,067±1,532) SBID (p=0,106). Nos pacientes com menos de 10 anos de idade, o escore Z de peso-idade foi menor nos pacientes com SBID (média=-0,968±1,359) do que nos sem SBID (média=-0,223±1,584) (p=0,026). Conclusões: Crianças e adolescentes com SBID associado a doenças do trato gastrintestinal apresentam menores valores de peso e estatura.
Descritores: Infecções Bacterianas/complicações
Desenvolvimento Infantil/fisiologia
Gastroenteropatias/microbiologia
Intestino Delgado/microbiologia
-Fármacos Gastrointestinais/administração & dosagem
Brasil/epidemiologia
Testes Respiratórios/métodos
Índice de Massa Corporal
Estudos de Casos e Controles
Estudos Retrospectivos
Hidrogênio/análise
Lactulose/administração & dosagem
Metano/análise
Limites: Humanos
Masculino
Feminino
Pré-Escolar
Criança
Tipo de Publ: Estudo Observacional
Responsável: BR1.1 - BIREME


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Texto completo SciELO Chile
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Id: lil-752883
Autor: Parra P, Ángela; Furió C, Simone; Arancibia A, Gabriel.
Título: Análisis de test de aire espirado en niños con sospecha de intolerancia a la lactosa / Breath tests in children with suspected lactose intolerance
Fonte: Rev. chil. pediatr;86(2):80-85, abr. 2015. graf, tab.
Idioma: es.
Resumo: Introducción: Un 70% de la población general presenta intolerancia a la lactosa; sin embargo, no existen estudios epidemiológicos en la población pediátrica chilena afectada por esta condición. Objetivos: Caracterizar una serie clínica de niños que acude a realizarse el test de aire espirado con lactosa para estudio de intolerancia a la lactosa, determinando la frecuencia de intolerancia y malabsorción, síntomas más frecuentes y rendimiento del test dependiendo de su origen. Pacientes y Método: Pacientes menores de 18 años que acudieron a realizarse el test de aire espirado con lactosa al Laboratorio de Gastroenterología de la Pontificia Universidad Católica de Chile, por sospecha clínica de intolerancia a la lactosa. Se consideró malabsorción un aumento ≥ 20 ppm sobre el nivel basal de hidrógeno (H2) o ≥ 34 ppm de H2 y metano (CH4) en conjunto y como intolerancia cuando lo anterior se asoció a la sumatoria de intensidad de síntomas ≥ 7 en el registro. Resultados: Se analizaron 194 pacientes entre 1 y 17 años de edad. De ellos, 102 (53%) pacientes resultaron malabsorbedores y 53 (27%) intolerantes. La frecuencia de intolerancia a la lactosa varió de un 7,1 a un 45,4%, con una mayor frecuencia a edades mayores. Los síntomas más reportados fueron dolor abdominal, meteorismo y borborigmo. Discusión: La malabsorción e intolerancia a lactosa se pueden pesquisar desde los primeros años de vida utilizando el test de aire espirado con lactosa asociado al cuestionario simultáneo de síntomas. Se puede observar un aumento en la frecuencia de intolerancia con la edad, además de una mayor positividad del examen si es solicitado por un gastroenterólogo.

Introduction: Up to 70% of the world population is lactose intolerance. However, there are no epidemiological studies among Chilean pediatric population affected by this condition. Objectives: Clinical characterization of a series of children who underwent the lactose intolerance breath test for lactose intolerance study, establishing intolerance and malabsorption frequencies, the most frequent symptoms, and test performance depending on the origin. Patients and Methods: Patients under 18 years old who took the lactose intolerance breath test in the Gastroenterology Laboratory of the Catholic University of Chile, and who were admitted due to clinically suspected lactose intolerance. Malabsorption was considered when there was as an increase of ≥ 20 ppm above the baseline (H2) or ≥ 34 ppm of H2 and methane (CH4) combined. Intolerance was considered when the above was associated with a symptom intensity score ≥ 7 during registration. Results: The analysis included194 patients aged 1 to17 years of age. Of these, 102 (53%) presented with malabsorption, and 53 (27%) were intolerant. The frequency of lactose intolerance varied from 7.1 to 45.4%, and it occurred more frequently at older ages. The most common reported symptoms were abdominal pain, bloating and rumbling. Discussion: Lactose malabsorption and intolerance can be investigated from the first years of life using the lactose breath test plus a symptom questionnaire. An increase in the frequency of intolerance with age, and a greater number of positive tests, if they were requested by a gastroenterologist, were observed.
Descritores: Hidrogênio/análise
Intolerância à Lactose/diagnóstico
Metano/análise
-Testes Respiratórios
Chile/epidemiologia
Inquéritos e Questionários
Fatores Etários
Intolerância à Lactose/epidemiologia
Limites: Humanos
Masculino
Feminino
Lactente
Pré-Escolar
Criança
Adolescente
Responsável: BR1.1 - BIREME


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Id: biblio-977044
Autor: Ley de Coss, Alejandro; Guerra-Medina, Cándido; Montañez-Valdez, Oziel; Guevara H, Francisco; Pinto R, René; Reyes-Gutiérrez, José.
Título: In vitro production of gas methane by tropical grasses / Produccion in vitro de gas metano por gramineas forrajeras tropicales
Fonte: Rev. MVZ Córdoba;23(3):6788-6798, Sep.-Dec. 2018. tab.
Idioma: en.
Resumo: ABSTRACT Objective. Estimate the production of methane (CH4) by tropical grasses fermented in vitro. Materials and methods. A sample of 20 g dry matter of Cynodon nlemfuensis, Hyparrhenia rufa, Megathyrsus maximus and Digitaria swazilandensis plus 200 ml of culture medium were plated in triplicate flasks sterile stainless steel with CO2 flux, inoculated with 20 ml of ruminal fluid bovine, incubated at 38 °C for 24, 48, 72 and 96 h. Total production of gas, CH4, volatile fatty acids, and pH were evaluated in a completely randomized design with three replicates per treatment and comparison of means with Tukey; the concentration of total and cellulolytic bacteria were analyzed with the Kruskal-Wallis, and the GLM procedure independent data Wilcoxon rank. Results. H. rufa and D. swazilandensis both had the lowest total gas production (p<0.05), while D. swazilandensis had lower production of CH4, increased production of propionic acid (p<0.05) and lower pH 96 hours of incubation (p<0.05). D. swazilandensis showed greater efficiency in energy production due to reduced production of CH4 and increased propionate production. The concentration of total bacteria was similar between treatments (p>0.05), while the concentration of cellulolytic bacteria was lower in C. nlemfuensis y D. swazilandensis when 96 of incubation (p<0.05). Conclusions. The Digitaria swazilandensis, showed favorable conditions to have lower total methane and total gas production.

RESUMEN Objetivo. Estimar la producción de metano (CH4) por gramíneas tropicales fermentadas in vitro. Materiales y métodos. Una muestra de 20 g de materia seca de Cynodon nlemfuensis, Hyparrhenia rufa, Megathyrsus maximus y Digitaria swazilandensis más 200 ml de medio de cultivo se depositaron por triplicado en frascos de acero inoxidable estériles con flujo de CO2, se inocularon con 20 ml de líquido ruminal de bovino e incubaron a 38 °C por 24, 48, 72 y 96 h. Se evaluó producción total de gas, CH4, ácidos grasos volátiles, y pH en un diseño completamente al azar con tres repeticiones por tratamiento y la comparación de medias con Tukey; la concentración de bacterias totales y celulolíticas, se analizaron con la prueba de Kruskal-Wallis, y el procedimiento GLM con datos de rangos independientes de Wilcoxon. Resultados. H. rufa y D. swazilandensis tuvieron la menor producción total de gases (p<0.05), mientras que D. swazilandensis tuvo menor producción de CH4, mayor producción de ácido propónico (p<0.05) y menor pH a las 96 horas de incubación (p<0.05). D. swazilandensis mostró mayor eficiencia en la producción de energía por la menor producción de CH4 y mayor producción de propionato. La concentración de bacterias totales fue similar entre tratamientos (p>0.05), mientras que la concentración de bacterias celulolíticas fue menor en C. nlemfuensis y D. swazilandensis a la hora 96 de incubación (p<0.05). Conclusiones. La Digitaria swazilandensis, mostró condiciones favorables para tener menor producción total de metano y gases totales.
Descritores: Técnicas In Vitro
Metano
-Poaceae
Responsável: CO140 - Facultad de Medicina Veterinária y Zootecnia


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Id: biblio-1115253
Autor: Zavaleta C, Carmen; Orellana M, Carla; Vera A, Nelson; Manterola B, Hector; Castellaro G, Giorgio; Parraguez G, Víctor H.
Título: Reducción de metano in vitro con el glucósido cianogénico Linamarina / Reduction of in vitro methane with the cyanogenic glucoside Linamarin
Fonte: Rev. MVZ Córdoba;24(3):7291-7296, sep.-dic. 2019. tab, graf.
Idioma: es.
Resumo: RESUMEN Objetivo. Evaluar el efecto de dosis crecientes del glucósido cianogénico Linamarina, en la reducción de metano ruminal in vitro. Materiales y Métodos. Se empleó líquido ruminal de dos ovejas fistuladas de la raza Merino Precoz, con el que se inoculó un sustrato fermentativo constituido por heno de alfalfa (Medicago sativa) y grano de avena molido (Avena sativa L.), se adicionó solución buffer y Linamarina (pureza de ≥98%) en dosis crecientes, lo que se llevó a incubación por ocho horas in vitro. El metano se midió cada hora, con un monitor de gases infrarrojo. Resultados. De acuerdo con el incremento de las dosis de Linamarina (0, 6, 13, 20 y 26 mg/L), la concentración de metano disminuyó de forma lineal (p≤0.05) en (9.7, 9.2, 18.1 y 29.4%) respectivamente. Se observó una reducción significativa de metano con la dosis más alta de Linamarina. Conclusión. La Linamarina, en su estado puro, fue eficaz en la reducción de metano durante la fermentación ruminal in vitro. Por lo tanto, este estudio constituye una base para futuros experimentos que incluyan fuentes vegetales de Linamarina y otras variables ruminales, lo que puede conducir a encontrar estrategias para reducir los gases de efecto invernadero.

ABSTRACT Objective. To assess the effect of rising doses of the cyanogenic glucoside Linamarin on the reduction of in vitro rumen methane. Materials and methods. Rumen fluid from two fistulated Merino Precoz sheep, inoculated with a fermentation substrate comprising alfalfa hay (Medicago sativa) and ground oat grain (Avena sativa L.), and added with buffer solution and Linamarin (purity ≥98%) in rising doses, was incubated for eight hours in vitro. Methane was measured each hour with an infrared gas monitor. Results. According Linamarin doses were increased (0, 6, 13, 20 and 26 mg/L), the methane concentration fell in a linear manner (p≤0.05) by (9.7, 9.2, 18.1 and 29.4%), respectively. A significant reduction of methane was seen whit the highest dose of Linamarin. Conclusions. Linamarin, in pure state, was effective to reduce methane during in vitro ruminal fermentation. Therefore, this study constitutes a basis for future experiments including vegetable sources of Linamarin as well as other rumen variables, leading to find a strategy for reducing greenhouse gases.
Descritores: Técnicas In Vitro
Aditivos Alimentares
Glucosídeos
Metano
-Fermentação
Responsável: CO140 - Facultad de Medicina Veterinária y Zootecnia


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Id: biblio-1128982
Autor: Varela, Darka de Angelis; Corrales López, Catalina; Salazar Fernández, Francisca; Solís Núñez, Camila; Yáñez Figueroa, Claudia; Corrales López, Tábata.
Título: Asociación entre los niveles de NO, NO2, SO2, O3, CH4 en el aire y las tasas de hospitalización del Hospital Adriana Cousiño de Quintero durante los años 2012 al 2018 / Association between levels of NO, NO2, SO2, O3, CH4 in the air and hospitalization rates at Hospital Adriana Cousiño de Quintero during the years 2012 to 2018
Fonte: Rev. ANACEM (Impresa);14(2):29-42, 2020. ilus, tab, graf.
Idioma: es.
Resumo: En el sector de Quintero, desde los últimos 50 años han existido diversos hitos relacionados con la contaminación medioambiental. Iniciando con la instauración de la termoeléctrica "Ventanas" en 1950, Chilectra en 1958. En el año 1993 el ministerio de Agricultura de Chile declaró a Puchuncaví y Quintero como una "zona saturada de contaminación" por dióxido de azufre (SO2) y material particulado (MP10). En el año 2011, 135 trabajadores del complejo Ventana fallecieron producto del cáncer. Durante el 2014 hubo un derrame de petróleo en la Bahía de Quintero, 2015 un informe del Instituto de Fomento Pesquero (IFOP) arrojó cifras de arsénico que superan 23 veces la norma establecida por el Código Sanitario de Alimentos. Frente a dicho escenario, se hace evidente la necesidad de comprender cómo es la situación de los pobladores de dichas comunas. La presente investigación busca asociar los niveles de contaminación de las comuna de Quintero y el número de hospitalizaciones durante los años 2012 hasta el 2018.

In Quintero, since the last 50 years there have been various milestones related to environmental pollution. Starting with the installation of the "Ventanas" thermoelectric plant in 1950, Chilectra in 1958. In 1993, the Chilean Ministry of Agriculture declared Puchuncaví and Quintero as a "zone saturated with contamination" by sulfur dioxide (SO2) and particulate matter (MP10). In 2011, 135 workers at the Ventana complex died of cancer. During 2014 an oil spill emerged in Quintero Bay, 2015 a report by the Institute for Fisheries Development (IFOP) showed arsenic figures that exceed 23 times the norm established by the Sanitary Food Code. Faced with this scenario, the need to understand what the situation of the residents of said communes is like is evident. The present investigation seeks to associate the levels of contamination of the commun of Quintero and the number of hospitalizations during the years 2012 to 2018.
Descritores: Poluição do Ar
Exposição Ambiental/estatística & dados numéricos
Poluentes Ambientais/análise
Hospitalização/estatística & dados numéricos
-Ozônio/análise
Dióxido de Enxofre/análise
Chile
Análise de Regressão
Fatores de Risco
Regulamentação Governamental
Metano/análise
Dióxido de Nitrogênio/análise
Responsável: CL126.2 - Biblioteca Médica Dr. Profesor Hernán Alessandri R.


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Id: lil-787344
Autor: Paulo, Gustavo Andrade de; Martins, Fernanda Prata Borges; Macedo, Erika Pereira de; Gonçalves, Manoel Ernesto Peçanha; Ferrari, Angelo Paulo.
Título: Safety of mannitol use in bowel preparation: a prospective assessment of intestinal methane (CH4) levels during colonoscopy after mannitol and sodium phosphate (NaP) bowel cleansing / Segurança do uso do manitol no preparo para colonoscopia: avaliação prospectiva do nível de metano (CH4) intestinal durante colonoscopia após preparo com manitol e fosfato de sódio (NaP)
Fonte: Arq. gastroenterol;53(3):196-202tab.
Idioma: en.
Resumo: ABSTRACT Background - Adequate bowel preparation is critical for the quality of colonoscopy. Despite reported occurrence of colonic explosion due to methane and hydrogen production by bacterial fermentation during colonoscopy, gas exchange during the procedure is believed to be effective in lowering existing methane concentration, allowing for safe utilization of mannitol for bowel preparation. Thus, mannitol is widely used for bowel cleansing prior to colonoscopy, considering its low cost and effectiveness for bowel preparation. Objective - The aim of this study was to assess the safety of mannitol for bowel preparation, when compared to sodium phosphate (NaP). Methods - We conducted a prospective observational study in which 250 patients undergoing colonoscopy at Universidade Federal de São Paulo and Hospital Albert Einstein (São Paulo, Brazil) were approached for inclusion in the study. Patients received either mannitol (n=50) or NaP (n=200) for bowel preparation, based on physician indication. Study was conducted from August 2009 to December 2009. The main outcome of interest was presence of detectable levels of methane (CH4) during colonoscopy and reduction in such levels after gas exchange during the procedure. Methane concentrations were measured in three intestinal segments during scope introduction and withdrawal. Safety was assessed as the absence of high levels of methane, defined as 5%. Measurements were made using a multi-gas monitor (X-am 7000, Dräger Safety AG & Co. KGaA, Lübeck, Germany) connected to a plastic catheter introduced into the working channel of the colonoscope. Additional outcomes of interest included levels of O2. Methane and O2 levels are reported as ppm. Mean, difference and standard deviation of levels of gas measured in both moments were calculated and compared in both groups. Proportions of patients with detectable or high levels of methane in both groups were compared. Continuous variables were analyzed using t test and categorical variables using qui-square tests. The Ethics Committee in both study sites approved the study protocol. Results - Patients in both groups were similar regarding demographics, colonoscopy indication, ASA status and quality of bowel preparation. Seven (3.5%) patients in the NaP group had methane detected during introduction of the endoscope. Methane levels became undetectable during withdrawal of the scope. None of the patients in the mannitol group had detectable levels of methane. O2 levels did not differ in the groups. Conclusion - This is the largest study to assess the safety of mannitol for bowel preparation, considering methane measurements. Our results indicate that mannitol use is as safe as NaP, and gas exchange was efficient in reducing methane concentrations.

RESUMO Contexto - Preparo adequado é fundamental para garantia de boa qualidade em colonoscopia. Apesar de relatos de explosão do cólon durante colonoscopia, secundários à produção de metano e hidrogênio pela fermentação bacteriana, acredita-se que a troca gasosa durante o procedimento diminua a concentração existente de metano, permitindo a utilização com segurança, de manitol para o preparo de cólon. Assim, manitol é largamente utilizado para limpeza dos cólons antes da colonoscopia, especialmente devido ao seu baixo custo e eficácia. Objetivo - O objetivo do estudo foi avaliar a segurança do uso de manitol no preparo dos cólons, quando comparado ao uso de fosfo-soda (NaP). Métodos - Este foi um estudo observacional retrospectivo no qual foram incluídos 250 pacientes submetidos a colonoscopia na Universidade Federal de São Paulo e Hospital Albert Einstein (São Paulo - Brasil). Os pacientes receberam preparo de cólon com manitol (n=50) ou NaP (n=200), de acordo com preferências dos médicos que encaminharam os pacientes. O estudo foi realizado entre agosto e dezembro de 2009. O principal resultado pesquisado foi a presença de níveis detectáveis de metano (CH4) durante a colonoscopia, e a redução nestes níveis após troca gasosa durante o procedimento. As concentrações de metano foram dosadas com detector multi-gas (X-am 7000, Dräger Safety AG & Co., KGaA, Lübeck, Alemanha) conectado a um cateter plástico que foi introduzido no canal de instrumentação do colonoscópio. Outro achado de interesse foram níveis de O2. Níveis de metano e O2 foram relatados em ppm. Média, diferença entre as médias e desvio padrão nos níveis dos gases em ambos momentos foram comparados nos dois grupos. A proporção de pacientes com níveis detectáveis ou altos de metano em ambos os grupos foram comparados. Variáveis contínuas foram analisadas com teste t e variáveis categóricas com o teste do qui-quadrado. Os Comitês de Ética de ambas instituições aprovaram o protocolo do estudo. Resultados - Pacientes nos dois grupos foram comparáveis quanto aos dados demográficos, indicação para colonoscopia, classificação ASA e qualidade do preparo do cólon. Sete (3,5%) pacientes no grupo NaP tinham níveis detectáveis de metano durante a introdução do colonoscópio. Os níveis de metano se tornaram indetectáveis durante a retirada do aparelho. Nenhum dos pacientes no grupo manitol tinha níveis detectáveis de metano. Níveis de O2 foram semelhantes nos dois grupos. Conclusão - Este é o estudo com maior casuística que avaliou a segurança do uso de manitol para preparo de cólon, no que diz respeito a dosagem de metano. Nossos resultados indicam que o emprego do manitol é tão seguro quanto o NaP, e que a troca gasosa é eficaz na redução da concentração de metano.
Descritores: Fosfatos/administração & dosagem
Catárticos/administração & dosagem
Colonoscopia/métodos
Intestinos/fisiologia
Manitol/administração & dosagem
Metano/análise
-Cuidados Pré-Operatórios/métodos
Estudos Prospectivos
Gases/análise
Pessoa de Meia-Idade
Limites: Humanos
Masculino
Feminino
Adulto
Idoso
Idoso de 80 Anos ou mais
Adulto Jovem
Tipo de Publ: Estudo Observacional
Responsável: BR1.1 - BIREME


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Id: biblio-1025045
Autor: Solarte-Toro, Juan Camilo; Chacón-Pérez, Yessica; Cardona-Alzate, Carlos Ariel.
Título: Evaluation of biogas and syngas as energy vectors for heat and power generation using lignocellulosic biomass as raw material
Fonte: Electron. j. biotechnol;33:52-62, May. 2018. tab, ilus.
Idioma: en.
Projeto: Departamento Administrativo de Ciencia, Tecnología e Innovación.
Resumo: The use of nonrenewable energy sources to provide the worldwide energy needs has caused different problems such as global warming, water pollution, and smog production. In this sense, lignocellulosic biomass has been postulated as a renewable energy source able to produce energy carriers that can cover this energy demand. Biogas and syngas are two energy vectors that have been suggested to generate heat and power through their use in cogeneration systems. Therefore, the aim of this review is to develop a comparison between these energy vectors considering their main features based on literature reports. In addition, a techno-economic and energy assessment of the heat and power generation using these vectors as energy sources is performed. If lignocellulosic biomass is used as raw material, biogas is more commonly used for cogeneration purposes than syngas. However, syngas from biomass gasification has a great potential to be employed as a chemical platform in the production of value-added products. Moreover, the investment costs to generate heat and power from lignocellulosic materials using the anaerobic digestion technology are higher than those using the gasification technology. As a conclusion, it was evidenced that upgraded biogas has a higher potential to produce heat and power than syngas. Nevertheless, the implementation of both energy vectors into the energy market is important to cover the increasing worldwide energy demand.
Descritores: Biocombustíveis/análise
Lignina/metabolismo
-Centrais Elétricas
Digestão Anaeróbia
Biomassa
Energia Renovável
Temperatura Alta
Lignina/química
Metano
Tipo de Publ: Revisão
Responsável: CL1.1 - Biblioteca Central


  9 / 45 LILACS  
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Id: biblio-1051225
Autor: Swiatek, Michal; Lewicki, Andrzej; Szymanowska, Daria; Kubiak, Piotr.
Título: The effect of introduction of chicken manure on the biodiversity and performance of an anaerobic digester
Fonte: Electron. j. biotechnol;37:25-33, Jan. 2019. tab, graf, ilus.
Idioma: en.
Projeto: National Centre for Research and Development (NCBR).
Resumo: Background: Ammonium stress is a prime limiting phenomenon that occurs during methane formation from poultry manure. It is caused by elevated ammonium nitrogen concentrations that result from substrate decomposition. The amounts of methane formed depend on the activity of methanogenic microbes. Results: During the research reported in this paper, the response of a mesophilic consortium inhabiting a biogas reactor to rising load of poultry manure was investigated. The taxonomic composition of bacterial population was mostly typical, however syntrophic bacteria were not detected. This absence resulted in limitation of succession of some methanogenic microorganisms, especially obligate hydrogenotrophs. The methanogenic activity of the consortium was totally dependent on the activity of Methanosaeta. Inhibition of methanoganesis was noticed at ammonium nitrogen concentration of 3.68 g/L, total cessation occurred at 5.45 g/L. Significant amounts of acetic acid in the fermentation pulp accompanied the inhibition. Conclusions: The effectiveness of the consortium was totally dependent on the metabolic activity of the acetoclastic Methanoseata genus and lack of SAOB did not allow hydrogenotrophic methanogens to propagate and lead to cessation of biogas production at an elevated ammonium concentration at which acetoclastic methanogens were inhibited.
Descritores: Methanosarcinaceae/metabolismo
Biocombustíveis
Microbiota
Anaerobiose
-Aves Domésticas
Estresse Fisiológico
Reação em Cadeia da Polimerase
Impressões Digitais de DNA
Cromatografia Líquida de Alta Pressão
Archaea/metabolismo
Biodiversidade
Fermentação
Consórcios Microbianos
Compostos de Amônio
Esterco
Metano
Nitrogênio
Responsável: CL1.1 - Biblioteca Central


  10 / 45 LILACS  
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Id: biblio-1052269
Autor: Feng, Shoushuai; Hou, Shaoxiang; Huang, Xing; Fang, Zheng; Tong, Yanjun; Yang, Hailin.
Título: Insights into the microbial community structure of anaerobic digestion of municipal solid waste landfill leachate for methane production by adaptive thermophilic granular sludge
Fonte: Electron. j. biotechnol;39:98-106, may. 2019. tab, graf, ilus.
Idioma: en.
Projeto: National Natural Science Foundation of China; . Social Development Projects of Jiangsu Province; . Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education; . Key Laboratory of Industrial Biotechnology, Ministry of Education; . Priority Academic Program Development of; . Jiangsu Higher Education Institutions, and Program of Introducing; . Talents of Discipline to Universities.
Resumo: BACKGROUND: The amount of municipal solid waste (MSW) gradually increased along with the rapid development of modern cities. A large amount of landfill leachate are generated with excessive chemical oxygen demand (COD), which create a great deal of pressure on the environment-friendly treatment process. Anaerobic digestion is an ideal technique to solve the above problem. RESULTS: A thermophilic granular sludge was successfully adapted for anaerobic digestion of MSW leachate (from an aging large-scale landfill) for methane production. The COD degradation efficiency improved by 81.8%, while the methane production rate reached 117.3 mL CH4/(g VS d), which was 2.34-fold more than the control condition. The bacterial and archaeal communities involved in the process were revealed by 16S rRNA gene high-throughput pyrosequencing. The richness of the bacterial community decreased in the process of thermophilic granular sludge, while the archaeal community structure presented a reverse phenomenon. The bacterial genus, Methanosaeta was the most abundant during the mesophilic process, while Methanobacterium, Methanoculleus, Methanosaeta and Methanosarcina were more evenly distributed. The more balanced community distribution between hydrogenotrophic and acetotrophic methanogens implied a closer interaction between the microbes, which further contributed to higher methane productivity. The detailed relationship between the key functional communities and anaerobic digestion performances were demonstrated via the multivariate canonical correspondence analysis. Conclusions: With the assistance of adaptive thermophilic granular sludge, microbial community structure was more evenly distributed, while both of COD degradation rate and methane production was improved during anaerobic digestion of MSW landfill leachate.
Descritores: Bactérias Anaeróbias/metabolismo
Resíduos Sólidos
Digestão Anaeróbia
Tratamento de Lodos
Metano/metabolismo
-Esgotos/microbiologia
Bactérias Anaeróbias/isolamento & purificação
Poluentes Químicos da Água
Reação em Cadeia da Polimerase
Área Urbana
Biocombustíveis
Análise da Demanda Biológica de Oxigênio
Temperatura Alta
Anaerobiose
Responsável: CL1.1 - Biblioteca Central



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