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Id: biblio-1013359
Autor: Revelo Romo, Dolly Margot; Hurtado Gutiérrez, Nelson Humberto; Ruiz Pazos, Jaime Orlando; Pabón Figueroa, Lizeth Vanessa; Ordóñez Ordóñez, Leidy Alejandra.
Título: Diversidad bacteriana en el biocátodo reductor de Cr(VI) de una Celda de Combustible Microbiana con puente salino / Bacterial diversity in the Cr(VI) reducing biocathode of a Microbial Fuel Cell with salt bridge
Fonte: Rev. argent. microbiol;51(2):110-118, jun. 2019. ilus, tab.
Idioma: en.
Resumo: Although Cr(VI)-reducing and/or tolerant microorganisms have been investigated, there is no detailed information on the composition of the microbial community of the biocathode microbial fuel cell for Cr(VI) reduction. In this investigation, the bacterial diversity of a biocathode was analyzed using 454 pyrosequencing of the 16S rRNA gene. It was found that most bacteria belonged to phylum Proteobacteria (78.8%), Firmicutes (7.9%), Actinobacteria (6.6%) and Bacteroidetes (5.5%), commonly present in environments contaminated with Cr(VI). The dominance of the genus Pseudomonas (34.87%), followed by the genera Stenotrophomonas (5.8%), Shinella (4%), Papillibacter (3.96%), Brevundimonas (3.91%), Pseu-dochrobactrum (3.54%), Ochrobactrum (3.49%), Hydrogenophaga (2.88%), Rhodococcus (2.88%), Fluviicola (2.35%), and Alcaligenes (2.3%), was found. It is emphasized that some genera have not previously been associated with Cr(VI) reduction. This biocathode from waters contaminated with tannery effluents was able to remove Cr(VI) (97.83%) in the cathodic chamber. Additionally, through use of anaerobic sludge in the anodic chamber, the removal of 76.6% of organic matter (glucose) from synthetic waste water was achieved. In this study, an efficient biocathode for the reduction of Cr(VI) with future use in bioremediation, was characterized.

Aunque se ha investigado sobre los microorganismos reductores y/o tolerantes de Cr(VI), no hay información detallada sobre la composición de la comunidad microbiana del cátodo de una Celda de Combustible Microbiana para la reducción de Cr(VI). En esta investigación se analizó la diversidad bacteriana de un biocátodo usando pirosecuenciación 454 del gen 16S rRNA. Se encontró que la mayoría de las bacterias pertenecieron a los filos Proteobac-teria (78,8%), Firmicutes (7,9%), Actinobacteria (6,6%) y Bacteroidetes (5,5%), comúnmente presentes en ambientes contaminados con Cr(VI). Se encontró como género dominante a Pseudomonas (34,87%), seguido por los géneros Stenotrophomonas (5,8%), Shinella (4%), Papil-libacter (3,96%), Brevundimonas (3,91%), Pseudochrobactrum (3,54%), Ochrobactrum (3,49%), Hydrogenophaga (2,88%), Rhodococcus (2,88%), Fluviicola (2,35%) y Alcaligenes (2,3%). Se destaca que algunos géneros no han sido previamente asociados con la reducción de Cr(VI). Este biocátodo procedente de aguas contaminadas con efluentes de curtiembres fue capaz de remover Cr(VI) (97,83%) en la cámara catódica. Adicionalmente, a través del uso de lodo anaeróbico en la cámara anódica, se logró la remoción del 76,6% de materia orgánica (glucosa) a partir de agua residual sintética. En este estudio se caracterizó un eficiente biocátodo para la reducción de Cr(VI) con futuro uso en biorremediación.
Descritores: RNA Ribossômico 16S/análise
Actinobacteria/isolamento & purificação
Águas Residuárias/microbiologia
-Bactérias/crescimento & desenvolvimento
Biodegradação Ambiental
Monitoramento Ambiental
Substâncias Redutoras/análise
Tipo de Publ: Ensaio Clínico
Estudo de Avaliação
Responsável: AR635.1 - FCVyS - Servicio de Información y Documentación


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Id: lil-596561
Autor: León, Jorge; Aponte, Juan José; Rojas, Rosario; Cuadra, D´Lourdes; Ayala, Nathaly; Tomás, Gloria; Guerrero, Marco.
Título: Estudio de actinomicetos marinos aislados de la costa central del Perú y su actividad antibacteriana frente a Staphylococcus aureus Meticilina Resistentes y Enterococcus faecalis Vancomicina Resistentes / Study of marine actinomycetes isolated from the central coast of Peru and their antibacterial activity against Methicillin-Resistant Staphylococcus aureus and Vancomycin-Resistant Enterococcus faecalis
Fonte: Rev. peru. med. exp. salud publica;28(2):237-246, jun. 2011. ilus, graf, mapas, tab.
Idioma: es.
Resumo: Objetivos. Determinar el potencial antimicrobiano de actinomicetos marinos frente a cepas S. aureus meticilino-resistentes (MRSA) y E. faecalis vancomicina-resistentes (VRE). Materiales y métodos. En dos medios de cultivo se sembraron 29 cepas de actinomicetos aislados de sedimento marino. Se evaluó la capacidad inhibitoria mediante pruebas de antagonismo in vitro para MRSA y VRE. Se procesó los extractos orgánicos de tres actinomicetos seleccionados para determinar la Concentración Mínima Inhibitoria (CMI) del compuesto activo. Resultados. La mayoría de los actinomicetos aislados correspondieron a un grupo homogéneo de blanco-grisáceos (62 por ciento) con buen nivel de crecimiento en agar marino. Los porcentajes inhibitorios fueron superiores a 85 por ciento para ambos patógenos con halos de inhibición mayores a 69 y 78 mm de diámetro para MRSA y VRE respectivamente. Los extractos diclorometánicos de tres de los actinomicetos aislados (I-400A, B1-T61, M10-77) mostraron gran potencial inhibitorio de ambos patógenos, siendo M10-77 la cepa de actinomiceto de mayor actividad antibiótica frente a S. aureus ATCC 43300 resistente a meticilina y E. faecalis ATCC 51299 resistente a vancomicina con una Concentración Mínima Inhibitoria (CMI) de 7,9 y 31,7 μg/ mL respectivamente. El análisis filogenético de la cepa M10- 77 presenta un 99 por ciento de similaridad con la especie marina Streptomyces erythrogriseus. Conclusiones. El sedimento marino de la costa central del Perú es fuente promisorio de cepas de actinomicetos con gran capacidad de producir compuestos bioactivos capaces de inhibir patógenos tipificados como multidrogo-resistentes tales como S. aureus meticilino resistentes y E. faecalis vancomicina resistentes.

Objectives. To determine the antimicrobial potential of marine actinomycetes against drug-resistant pathogens represented by strains of methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant Enterococcus faecalis (VRE). Materials and methods. Strains of actinomycetes (29) isolated from marine sediment were evaluated by their characteristics in two culture media and by testing their inhibitory capacity by in vitro antagonism against multi-drug resistant (MDR) pathogenic bacteria for MRSA and VRE. Organic extracts of 3 selected actinomicetes were processed to determine the minimum inhibitory concentration (MIC) of the active compound. Results. Most isolated actinomycetes belong to a homogeneous group of write-gray actinomycetes with a good growth in Marine Agar. The inhibitory rates of the isolates were above 85 percent for both pathogens with inhibition zones greater than 69 and 78 mm in diameter for MRSA and VRE respectively. Dichloromethane extracts of 3 isolates (I-400A, B1-T61, M10-77) showed strong inhibitory activity of both pathogens, M10-77 being the highest actinomycete strain with antibiotic activity against methicillin-resistant S. aureus ATCC 43300 and vancomycin-resistant E. faecalis ATCC 51299 with a minimum inhibitory concentrations (MIC) of 7.9 and 31.7 μg/ml respectively. Phylogenetic analysis of M10-77 strain showed 99 percent similarity with the marine species Streptomyces erythrogriseus. Conclusions. Marine sediments of the central coast of Peru, are a source of actinomycetes strains showing high capacity to produce bioactive compounds able to inhibit pathogens classified as multi-drugresistant such as methicillin-resistant S. aureus and vancomycin-resistant E. faecalis.
Descritores: Actinobacteria/fisiologia
Antibiose
Enterococcus faecalis
Staphylococcus aureus Resistente à Meticilina
-Actinobacteria/isolamento & purificação
Enterococcus faecalis/efeitos dos fármacos
Sedimentos Geológicos/microbiologia
Peru
Água do Mar/microbiologia
Vancomicina/farmacologia
Microbiologia da Água
Tipo de Publ: Research Support, Non-U.S. Gov't
Responsável: BR1.1 - BIREME


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Id: biblio-991434
Autor: Fernández Merjildo, Diana; García Apac, Coralith; Zegarra Piérola, Jaime; Granados Bullon, Luis.
Título: Susceptibilidad antimicrobiana en aislamientos de secreción endotraqueal en la unidad de cuidados intensivos de un hospital nacional de Lima, 2016 / Antimicrobial susceptibility among endotracheal isolates in an intensive care unit in Lima, 2016
Fonte: Rev. méd. hered;28(4):236-241, oct.-dic. 2017. graf.
Idioma: es.
Resumo: Objetivos: Determinar la frecuencia de microorganismos y el patrón de susceptibilidad antimicrobiana en aislamientos de cultivos de secreción endotraqueal en la unidad de cuidados intensivos de un hospital nacional de Lima. Material y métodos: Estudio observacional, descriptivo. Se incluyeron 195 cultivos positivos de secreción endotraqueal de pacientes en ventilación mecánica durante el periodo enero a diciembre del 2016. Resultados: Acinetobacter sp. fue la bacteria más frecuentemente aislada (28%) seguido por Pseudomonas aeruginosa (22%) y Klebsiella pneumoniae (14%), Los aislamientos con Acinetobacter sp. presentaron una elevada resistencia a antibióticos carbapenémicos (meropenem 90% eimipenem 88%). Conclusiones: Se identificó una elevada frecuencia de Acinetobacter sp. En cultivos de secreción traqueal en la unidad de cuidados intensivos, con un patrón de multirresistencia. (AU)

Objectives: To determine the prevalence of micro-organisms and their susceptibility pattern among endotracheal isolates in an intensive care unit in national hospital in Lima. Methods: An observational, descriptive study was carried-out from January to December 2016, 195 positive isolates from endotracheal aspirates of patients under mechanical ventilation were analyzed. Results: Acinetobacter spp. was the most common bacteria isolates (28%), followed by Pseudomonas aeruginosa (22%) and Klebsiella pneumoniae (14%). Acinetobacter spp. was highly resistant to carbapenems (90% to meropenem and 88% to imipenem). Conclusions: Multi-drug resistant Acinetobacter spp. was the most common pathogen isolated in this setting. (AU)
Descritores: Traqueia
Actinobacteria
Secreções Corporais
Unidades de Terapia Intensiva
-Epidemiologia Descritiva
Estudos Observacionais como Assunto
Limites: Humanos
Tipo de Publ: Artigo Clássico
Responsável: PE1.1 - Oficina Universitária de Biblioteca


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Id: biblio-839352
Autor: Dalitz, Camila de Araújo; Porsani, Mariana Vieira; Figel, Izabel Cristina; Pimentel, Ida C; Dalzoto, Patrícia R.
Título: Potential for biocontrol of melanized fungi by actinobacteria isolated from intertidal region of Ilha Do Mel, Paraná, Brazil
Fonte: Braz. j. microbiol;48(1):32-36, Jan.-Mar. 2017. tab, graf.
Idioma: en.
Resumo: Abstract Actinobacteria occur in many environments and have the capacity to produce secondary metabolites with antibiotic potential. Identification and taxonomy of actinobacteria that produce antimicrobial substances is essential for the screening of new compounds, and sequencing of the 16S region of ribosomal DNA (rDNA), which is conserved and present in all bacteria, is an important method of identification. Melanized fungi are free-living organisms, which can also be pathogens of clinical importance. This work aimed to evaluate growth inhibition of melanized fungi by actinobacteria and to identify the latter to the species level. In this study, antimicrobial activity of 13 actinobacterial isolates from the genus Streptomyces was evaluated against seven melanized fungi of the genera Exophiala, Cladosporium, and Rhinocladiella. In all tests, all actinobacterial isolates showed inhibitory activity against all isolates of melanized fungi, and only one actinobacterial isolate had less efficient inhibitory activity. The 16S rDNA region of five previously unidentified actinobacterial isolates from Ilha do Mel, Paraná, Brazil, was sequenced; four of the isolates were identified as Streptomyces globisporus subsp. globisporus, and one isolate was identified as Streptomyces aureus. This work highlights the potential of actinobacteria with antifungal activity and their role in the pursuit of novel antimicrobial substances.
Descritores: Actinobacteria/fisiologia
Fungos/fisiologia
Antibiose
-Filogenia
Streptomyces/classificação
Streptomyces/genética
Brasil
RNA Ribossômico 16S/genética
Actinobacteria/isolamento & purificação
Actinobacteria/classificação
Actinobacteria/genética
Responsável: BR1.1 - BIREME


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Id: biblio-974282
Autor: Santos, Alexandra de Andrade; Silveira, Joaquim Albenísio Gomes da; Guilherme, Eliezer de Araujo; Bonifacio, Aurenivia; Rodrigues, Artenisa Cerqueira; Figueiredo, Márcia do Vale Barreto.
Título: Changes induced by co-inoculation in nitrogen-carbon metabolism in cowpea under salinity stress
Fonte: Braz. j. microbiol;49(4):685-694, Oct.-Dec. 2018. tab, graf.
Idioma: en.
Resumo: ABSTRACT To mitigate the deleterious effects of abiotic stress, the use of plant growth-promoting bacteria along with diazotrophic bacteria has been increasing. The objectives of this study were to investigate the key enzymes related to nitrogen and carbon metabolism in the biological nitrogen fixation process and to elucidate the activities of these enzymes by the synergistic interaction between Bradyrhizobium and plant growth-promoting bacteria in the absence and presence of salt stress. Cowpea plants were cultivated under axenic conditions, inoculated with Bradyrhizobium and co-inoculated with Bradyrhizobium sp. and Actinomadura sp., Bradyrhizobium sp. and Bacillus sp., Bradyrhizobium sp. and Paenibacillus graminis, and Bradyrhizobium sp. and Streptomycessp.; the plants were also maintained in the absence (control) and presence of salt stress (50 mmolL-1 NaCl). Salinity reduced the amino acids, free ammonia, ureides, proteins and total nitrogen content in nodules and increased the levels of sucrose and soluble sugars. The co-inoculations responded differently to the activity of glutamine synthetase enzymes under salt stress, as well as glutamate synthase, glutamate dehydrogenase aminating, and acid invertase in the control and salt stress. Considering the development conditions of this experiment, co-inoculation with Bradyrhizobium sp. and Bacillus sp. in cowpea provided better symbiotic performance, mitigating the deleterious effects of salt stress.
Descritores: Carbono/metabolismo
Cloreto de Sódio/metabolismo
Vigna/metabolismo
Nitrogênio/metabolismo
-Microbiologia do Solo
Cloreto de Sódio/análise
Actinobacteria/fisiologia
Raízes de Plantas/crescimento & desenvolvimento
Raízes de Plantas/metabolismo
Raízes de Plantas/microbiologia
Bradyrhizobium/fisiologia
Inoculantes Agrícolas/fisiologia
Vigna/crescimento & desenvolvimento
Vigna/microbiologia
FRONTAL LOBE0
Aminoácidos/metabolismo
Fixação de Nitrogênio
Responsável: BR1.1 - BIREME


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Id: biblio-1008381
Autor: Xu, Guojing; Li, Dongwei; Jiao, Binquan; Li, Dou; Yin, Yajie; Lun, Limei; Zhao, Ziqiang; Li, Shan.
Título: Biomineralization of a calcifying ureolytic bacterium Microbacterium sp. GM-1
Fonte: Electron. j. biotechnol;25:21-27, ene. 2017. ilus, graf, tab.
Idioma: en.
Projeto: Natural Science Foundation of China; . Chongqing Science & Technology Commission.
Resumo: Background: Biomineralization is a significant process performed by living organisms in which minerals are produced through the hardening of biological tissues. Herein, we focus on calcium carbonate precipitation, as part of biomineralization, to be used in applications for environmental protection, material technology, and other fields. A strain GM-1, Microbacterium sp. GM-1, isolated from active sludge, was investigated for its ability to produce urease and induce calcium carbonate precipitation in a metabolic process. Results: It was discovered that Microbacterium sp. GM-1 resisted high concentrations of urea up to 60 g/L. In order to optimize the calcification process of Microbacterium sp. GM-1, the concentrations of Ni2+ and urea, pH value, and culture time were analyzed through orthogonal tests. The favored calcite precipitation culture conditions were as follows: the concentration of Ni2+ and urea were 50 µM and 60 g/L, respectively, pH of 10, and culture time of 96 h. Using X-ray diffraction analysis, the calcium carbonate polymorphs produced by Microbacterium sp. GM-1 were proven to be mainly calcite. Conclusions: The results of this research provide evidence that Microbacterium sp. GM-1 can biologically induce calcification and suggest that strain GM-1 may play a potential role in the synthesis of new biominerals and in bioremediation or biorecovery.
Descritores: Actinobacteria/metabolismo
FRONTAL BONEABDOMINAL INJURIES
-Precipitação Química
Ureia/metabolismo
Calcificação Fisiológica
Carbonato de Cálcio/metabolismo
Actinobacteria/isolamento & purificação
Actinobacteria/química
Hidrólise
Níquel/metabolismo
Responsável: CL1.1 - Biblioteca Central


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Id: biblio-889233
Autor: Qin, Wei; Fan, Fuqiang; Zhu, Yi; Huang, Xiaolong; Ding, Aizhong; Liu, Xiang; Dou, Junfeng.
Título: Anaerobic biodegradation of benzo(a)pyrene by a novel Cellulosimicrobium cellulans CWS2 isolated from polycyclic aromatic hydrocarbon-contaminated soil
Fonte: Braz. j. microbiol;49(2):258-268, Apr.-June 2018. graf.
Idioma: en.
Projeto: National Natural Science Foundation of China; . Fundamental Research Funds for the Central Universities.
Resumo: Abstract Cellulosimicrobium cellulans CWS2, a novel strain capable of utilizing benzo(a)pyrene (BaP) as the sole carbon and energy source under nitrate-reducing conditions, was isolated from PAH-contaminated soil. Temperature and pH significantly affected BaP biodegradation, and the strain exhibited enhanced biodegradation ability at temperatures above 30 °C and between pH 7 and 10. The highest BaP removal rate (78.8%) was observed in 13 days when the initial BaP concentration was 10 mg/L, and the strain degraded BaP at constant rate even at a higher concentration (50 mg/L). Metal exposure experimental results illustrated that Cd(II) was the only metal ion that significantly inhibited biodegradation of BaP. The addition of 0.5 and 1.0 g/L glucose enhanced BaP biodegradation, while the addition of low-molecular-weight organic acids with stronger acidity reduced BaP removal rates during co-metabolic biodegradation. The addition of phenanthrene and pyrene, which were degraded to some extent by the strain, showed no distinct effect on BaP biodegradation. Gas chromatography-mass spectrometry (GC-MS) analysis revealed that the five rings of BaP opened, producing compounds with one to four rings which were more bioavailable. Thus, the strain exhibited strong BaP degradation capability and has great potential in the remediation of BaP-/PAH-contaminated environments.
Descritores: Microbiologia do Solo
Poluentes do Solo/metabolismo
Benzo(a)pireno/metabolismo
Actinobacteria/isolamento & purificação
Actinobacteria/metabolismo
-Temperatura
Cádmio/metabolismo
Carbono/metabolismo
Ácidos Carboxílicos/metabolismo
Biotransformação
Actinobacteria/classificação
Meios de Cultura/química
Inibidores Enzimáticos/metabolismo
Glucose/metabolismo
Concentração de Íons de Hidrogênio
Anaerobiose
Cromatografia Gasosa-Espectrometria de Massas
Responsável: BR1.1 - BIREME


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Id: biblio-889185
Autor: Muthukamalam, Santhakumar; Sivagangavathi, Sivalingam; Dhrishya, Dharmapal; Sudha Rani, Sadras.
Título: Characterization of dioxygenases and biosurfactants produced by crude oil degrading soil bacteria
Fonte: Braz. j. microbiol;48(4):637-647, Oct.-Dec. 2017. tab, graf.
Idioma: en.
Projeto: UGC.
Resumo: ABSTRACT Role of microbes in bioremediation of oil spills has become inevitable owing to their eco friendly nature. This study focused on the isolation and characterization of bacterial strains with superior oil degrading potential from crude-oil contaminated soil. Three such bacterial strains were selected and subsequently identified by 16S rRNA gene sequence analysis as Corynebacterium aurimucosum, Acinetobacter baumannii and Microbacterium hydrocarbonoxydans respectively. The specific activity of catechol 1,2 dioxygenase (C12O) and catechol 2,3 dioxygenase (C23O) was determined in these three strains wherein the activity of C12O was more than that of C23O. Among the three strains, Microbacterium hydrocarbonoxydans exhibited superior crude oil degrading ability as evidenced by its superior growth rate in crude oil enriched medium and enhanced activity of dioxygenases. Also degradation of total petroleum hydrocarbon (TPH) in crude oil was higher with Microbacterium hydrocarbonoxydans. The three strains also produced biosurfactants of glycolipid nature as indicated d by biochemical, FTIR and GCMS analysis. These findings emphasize that such bacterial strains with superior oil degrading capacity may find their potential application in bioremediation of oil spills and conservation of marine and soil ecosystem.
Descritores: Poluentes do Solo/metabolismo
Tensoativos/metabolismo
Proteínas de Bactérias/metabolismo
Petróleo/microbiologia
Actinobacteria/metabolismo
Corynebacterium/metabolismo
Acinetobacter baumannii/metabolismo
Dioxigenases/metabolismo
-Filogenia
Microbiologia do Solo
Tensoativos/química
Proteínas de Bactérias/genética
Biodegradação Ambiental
Petróleo/análise
Poluição por Petróleo/análise
Actinobacteria/crescimento & desenvolvimento
Actinobacteria/enzimologia
Actinobacteria/genética
Corynebacterium/crescimento & desenvolvimento
Corynebacterium/enzimologia
Corynebacterium/genética
Acinetobacter baumannii/crescimento & desenvolvimento
Acinetobacter baumannii/enzimologia
Acinetobacter baumannii/genética
Dioxigenases/genética
Índia
Responsável: BR1.1 - BIREME


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Id: biblio-965726
Autor: Naine, S Jemimah; Devi, C Subathra; Mohanasrinivasan, V.
Título: In vitro thrombolytic potential of bioactive compounds from marine Streptomyces sp. VITJS4 / Potencial trombolítico in vitro de compostos bioativos de Streptomyces marinhos sp. VITJS4
Fonte: Biosci. j. (Online);32(5):1314-1323, sept./oct 2016. ilus, tab, graf.
Idioma: en.
Resumo: The most practical approach to reduce morbidity and mortality of coronary heart disease (CHD) is to delay the process of thrombus by usage of clot-dissolving agents. The necessities of such safer compounds are to be critically examined for thrombolytic activity especially, from marine sources. Thrombolytic agents have been investigated as a possible treatment for thrombus. The aim of this study was to investigate the in vitro thrombolytic potential of Streptomyces sp.VITJS4 (NCIM No. 5574); (ACC No: JQ234978.1) active compounds. The fibrin degradation revealed a clear transparent zone of clearance with 500µg/mL concentration showing 24mm hydrolysis. The thrombolytic effect of Streptomyces sp.VITJS4 compounds was also demonstrated in vitro clot lysis assay where The percent of thrombolysis by the crude extract showed 90±1.7% at the concentration of 1000µg/mL, whereas percent of thrombolysis by streptokinase was found 100± 00%%. The bioactive compounds were further studied for spectrophotometric analysis. The UV-VIS profile showed different peaks ranging from 400-700 nm with different absorption respectively. The data confirmed the presence of both analogues with absorption maxima at 210 and 310 nm. A sensitive method using LC-MS technique was optimized for the separation and identification of bioactive metabolites which was indicated by the fingerprints. The results of the LC-MS analysis provided different peaks determining the presence of compounds with different therapeutic activities. The current study refers the bioactive compound as impressive thrombolytic agent for further laboratory study. Further studies should be conducted to ensure the efficacy and safety of different concentration of bioactive compounds for drug development. Hence the results reported perhaps useful for the discovery of novel thrombolytic drugs from marine origin.

A abordagem mais prática para reduzir a morbidade e a mortalidade da doença arterial coronariana (CHD, do inglês coronary heart disease) consiste em retardar o processo de trombo através da utilização de agentes de dissolução de coágulos. As necessidades de tais compostos mais seguros devem ser criticamente examinadas para a atividade trombolítica, especialmente de fontes marinhas. Agentes trombolíticos tem sido estudados como um possível tratamento para o trombo. O objetivo deste estudo foi investigar o potencial trombolítico in vitro dos compostos ativos do Streptomyces sp.VITJS4 (NCIM No. 5574); (ACC No: JQ234978.1). A degradação da fibrina revelou um clara zona livre transparente com concentração de 500µg/mL mostrando uma hidrólise de 24mm. O efeito trombolítico dos compostos de Streptomyces sp.VITJS4 também foi demonstrado no ensaio in vitro de lise dos coágulos em que a percentagem de trombólise pelo extrato bruto mostrou 90±1.7% a uma concentração de 1000µg/mL, enquanto que a percentagem de trombólise pela estreptoquinase foi de 100± 00%. Os compostos bioativos foram estudados posteriormente através da análise espectrofotométrica. O perfil ultra violeta visível (UV-VIS profile, em inglês) mostrou diferentes picos variando entre 400-700 nm com diferentes absorções respectivamente. Os dados confirmaram a presença de ambos os análogos com absorção máxima em 210 e 300 nm. Um método sensível usando a técnica LC-MS (Liquid chromatography­mass spectrometry) foi otimizado para a separação e identificação metabólitos bioativos que foram indicados pelas impressões digitais (?). Os resultados da análise LC-MS forneceram diferentes picos determinando a presença de compostos com diferentes atividades terapêuticas. O estudo atual refere-se ao composto bioativo como um agente trombolítico impressionante para futuros estudos em laboratório. Estudos futuros devem ser conduzidos para assegurar a eficácia e segurança de diferentes concentrações dos compostos bioativos para o desenvolvimento de drogas. Assim, os resultados reportados talvez sejam úteis para a descoberta de novas drogas trombolíticas de origem marinha.
Descritores: Streptomyces
Trombose
Técnicas In Vitro
Actinobacteria
Fibrinolíticos
Responsável: BR396.1 - Biblioteca Central


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Id: biblio-969229
Autor: Alves, Bruna Gomes; Martins, Cristian Marlon de Magalhães Rodrigues; Arcari, Marcos André; Peti, Ana Paula Ferranti; Moraes, Luiz Alberto Beraldo de; Santos, Marcos Veiga dos.
Título: Dose-response effect of crude extracts produced by actinobacteria on in vitro rumen fermentation / Padrão dose-resposta de extratos brutos produzidos por actinobactérias sobre a fermentação ruminal in vitro
Fonte: Braz. J. Vet. Res. Anim. Sci. (Online);55(3):e141243, Outubro 25, 2018. graf, tab.
Idioma: en.
Resumo: Actinobacteria have been researched as a source that produces crude extracts, which contain bioactive compounds able to act as antimicrobial agents. The present investigation evaluated the dose-response effect of two crude extracts, obtained at Caatinga rhizosphere (Caat) and Rhizophora mangle (AMC), on in vitro ruminal fermentation by:cumulative gas production, digestibility of dry (IVDMD) and organic matter (IVOMD), and short-chain fatty acids concentration (SCFA). Three multiparous Holstein dairy cows with ruminal fistula were used as the inoculum donors and fed a basal diet consisting of corn silage, soybean meal, urea, ground corn and mineral supplement. Ruminal fluid samples were incubated in glass bottles with 1 g of the dried and milled diet, a buffer solution, and the crude extracts evaluated in four doses (0.3, 0.6, 0.9 and 1.20 mg/10 mL inoculum) in a randomized block design, and the donators were considered as blocks with random effects. Additionally, negative controls were used. The results were expressed as average values based on triplicate analyses. Decreased cumulative gas production was observed according to linear dose response at 24, 48 and 72 h of incubation with the addition of Caat extract. The IVOMD showed a linear decrease at 72 h of incubation with dose Caat inclusion. Furthermore, the inclusion of Caat extract linearly reduced butyric and isovaleric acid concentrations, as well as acetate:propionate ratio. Finally, the Caat inclusion increased the propionic acid concentration in comparison to AMC extract. However, the inclusion of AMC extract did not affect any of the analyzed variables at the used doses. The Caat extract could be used as a modulator of in vitro ruminal fermentation, since it reduced acetate:propionate ratio and cumulative gas production.(AU)

As actinobactérias têm sido pesquisadas como fonte produtoras de extratos brutos que contêm compostos bioativos capazes de atuar como agentes antimicrobianos. O presente trabalho investigou o efeito dose-resposta de dois extratos brutos, AMC e Caat, na fermentação ruminal in vitro por: produção cumulativa de gás, digestibilidade in vitro da matéria seca (IVDMD) e matéria orgânica (IVOMD) e concentração de ácidos graxos de cadeia curta (SCFA). Três vacas leiteiras da raça Holandesa, multíparas e portadoras de fístula ruminal foram utilizadas como doadoras de inóculo ruminal e foram alimentadas com uma dieta basal composta por silagem de milho, farelo de soja, ureia, milho moído e suplemento mineral. As amostras de inóculo ruminal foram incubadas em garrafas de vidro com 1 g da dieta seca e moída, solução tampão e os extratos brutos avaliados em quatro doses (0,3, 0,6, 0,9 e 1,20 mg/10 mL de inóculo) em delineamento em blocos casualizados, sendo as doadoras consideradas os blocos como efeito aleatório. Além disso, foram utilizados controles negativos para a correção da produção de gás. Os resultados foram expressos como valores médios com base em análises triplicadas. A diminuição da produção cumulativa de gás foi observada de acordo com a dose em resposta linear às 24, 48 e 72 h de incubação com a adição de extrato de Caat. A IVOMD mostrou uma diminuição linear com 72 h de incubação com inclusão de Caat. Além disso, a inclusão do Caat reduziu linearmente as concentrações de ácido butírico e isovalérico, bem como a proporção de acetato/propionato. Diferentemente, a inclusão do extrato de AMC não afetou nenhuma das variáveis analisadas nas doses utilizadas. O extrato de Caat pode ser usado como um modulador da fermentação ruminal in vitro, uma vez que reduziu a proporção de acetato/propionato e a produção de gás acumulada. (AU)
Descritores: Actinobacteria/química
Fermentação
Ionóforos/síntese química
Responsável: BR68.1 - Biblioteca Virginie Buff D'Ápice



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