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Id: biblio-1050424
Autor: Contreras, Freddy; Hernández, Pablo.
Título: Revista Digital de Postgrado: 7 años de divulgación científica / Revista Digital de Postgrado: 7 years of scientific dissemination
Fonte: Revista Digital de Postgrado;7(2):8-8, 2018. [].
Idioma: es.
Resumo: []
Descritores: Diabetes Mellitus
Insuficiência Renal
Infecções Relacionadas a Cateter/microbiologia
Cateteres Venosos Centrais/efeitos adversos
Insuficiência Cardíaca
-Pseudomonas
Cocos Gram-Positivos/crescimento & desenvolvimento
Enterobacteriaceae
Limites: Seres Humanos
Masculino
Feminino
Tipo de Publ: Relatos de Casos
Responsável: VE539.1 - Centro de Documentación Dr. José Ángel Puchi Ferrer


  2 / 171 LILACS  
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Id: biblio-951815
Autor: Teleken, Jhony Tiago; Galvão, Alessandro Cazonatto; Robazza, Weber da Silva.
Título: Use of modified Richards model to predict isothermal and non-isothermal microbial growth
Fonte: Braz. j. microbiol;49(3):614-620, July-Sept. 2018. tab, graf.
Idioma: en.
Projeto: We would like to thank the Conselho Nacional de Desenvolvimento Científico e Tecnológico.
Resumo: Abstract Mathematical models are often used to predict microbial growth in food products. An important class of these models involves the adaptation of classical sigmoid functions, such as the Gompertz and logistic functions. This study aimed to validate the use of the modified Richards model in various situations, which have not previously been tested. The model was obtained through solving a system of two differential equations and could be applied to both isothermal and non-isothermal environments. To test and validate this model, we used published datasets containing data for the growth of Pseudomonas spp. in fish products. The results obtained after fitting the model showed that it could be effectively used to describe and predict the Pseudomonas growth curves under various temperature regimens. However, the influence of the shape parameter on the growth curve is an issue that needs further evaluation.
Descritores: Pseudomonas/crescimento & desenvolvimento
Cinética
-Pseudomonas/química
Temperatura Ambiente
Produtos Pesqueiros/microbiologia
Modelos Teóricos
Limites: Animais
Responsável: BR1.1 - BIREME


  3 / 171 LILACS  
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Id: biblio-974298
Autor: Vásquez-Ponce, Felipe; Higuera-Llantén, Sebastián; Pavlov, María S; Marshall, Sergio H; Olivares-Pacheco, Jorge.
Título: Phylogenetic MLSA and phenotypic analysis identification of three probable novel Pseudomonas species isolated on King George Island, South Shetland, Antarctica
Fonte: Braz. j. microbiol;49(4):695-702, Oct.-Dec. 2018. tab, graf.
Idioma: en.
Projeto: Pontificia Universidad Católica de Valparaíso; . Programa de Investigación Asociativa.
Resumo: ABSTRACT Antarctica harbors a great diversity of microorganisms, including bacteria, archaea, microalgae and yeasts. The Pseudomonas genus is one of the most diverse and successful bacterial groups described to date, but only eight species isolated from Antarctica have been characterized. Here, we present three potentially novel species isolated on King George Island. The most abundant isolates from four different environments, were genotypically and phenotypically characterized. Multilocus sequence analysis and 16S rRNA gene analysis of a sequence concatenate for six genes (16S, aroE, glnS, gyrB, ileS and rpoD), determined one of the isolates to be a new Pseudomonas mandelii strain, while the other three are good candidates for new Pseudomonas species. Additionally, genotype analyses showed the three candidates to be part of a new subgroup within the Pseudomonas fluorescens complex, together with the Antarctic species Pseudomonas antarctica and Pseudomonas extremaustralis. We propose terming this new subgroup P. antarctica. Likewise, phenotypic analyses using API 20 NE and BIOLOG® corroborated the genotyping results, confirming that all presented isolates form part of the P. fluorescens complex. Pseudomonas genus research on the Antarctic continent is in its infancy. To understand these microorganisms' role in this extreme environment, the characterization and description of new species is vital.
Descritores: Filogenia
Pseudomonas/isolamento & purificação
Pseudomonas/classificação
-Fenótipo
Pseudomonas/genética
Microbiologia do Solo
DNA Bacteriano/genética
DNA Ribossômico/genética
RNA Ribossômico 16S/genética
Tipagem de Sequências Multilocus
Ilhas
Genótipo
Regiões Antárticas
Responsável: BR1.1 - BIREME


  4 / 171 LILACS  
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Id: biblio-974335
Autor: Naeem, Muhammad; Aslam, Zubair; Khaliq, Abdul; Ahmed, Jam Nazir; Nawaz, Ahmad; Hussain, Mubshar.
Título: Plant growth promoting rhizobacteria reduce aphid population and enhance the productivity of bread wheat
Fonte: Braz. j. microbiol;49(supl.1):9-14, 2018. tab, graf.
Idioma: en.
Resumo: Abstract Plant growth promoting rhizobacteria increase plant growth and give protection against insect pests and pathogens. Due to the negative impact of chemical pesticides on environment, alternatives to these chemicals are needed. In this scenario, the biological methods of pest control offer an eco-friendly and an attractive option. In this study, the effect of two plant growth promoting rhizobacterial strains (Bacillus sp. strain 6 and Pseudomonas sp. strain 6K) on aphid population and wheat productivity was evaluated in an aphid susceptible (Pasban-90) and resistant (Inqlab-91) wheat cultivar. The seeds were inoculated with each PGPR strain, separately or the combination of both. The lowest aphid population (2.1 tiller−1), and highest plant height (85.8 cm), number of spikelets per spike (18), grains per spike (44), productive tillers (320 m−2), straw yield (8.6 Mg ha−1), and grain yield (4.8 Mg ha−1) were achieved when seeds were inoculated with Bacillus sp. strain 6 + Pseudomonas sp. strain 6K. The grain yield of both varieties was enhanced by 35.5-38.9% with seed inoculation with both bacterial strains. Thus, the combine use of both PGPR strains viz. Bacillus sp. strain 6 + Pseudomonas sp. strain 6K offers an attractive option to reduce aphid population tied with better wheat productivity.
Descritores: Afídeos/crescimento & desenvolvimento
Pseudomonas/fisiologia
Bacillus/fisiologia
Triticum/crescimento & desenvolvimento
-Doenças das Plantas/parasitologia
Doenças das Plantas/prevenção & controle
Microbiologia do Solo
Triticum/microbiologia
Triticum/parasitologia
Controle Biológico de Vetores
Dinâmica Populacional
Limites: Animais
Responsável: BR1.1 - BIREME


  5 / 171 LILACS  
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Id: lil-788953
Autor: Nwinyi, Obinna C; Ajayi, Oluseyi O; Amund, Olukayode O.
Título: Degradation of polynuclear aromatic hydrocarbons by two strains of Pseudomonas
Fonte: Braz. j. microbiol;47(3):551-562, July-Sept. 2016. tab, graf.
Idioma: en.
Resumo: ABSTRACT The goal of this investigation was to isolate competent polynuclear aromatic hydrocarbons degraders that can utilize polynuclear aromatic hydrocarbons of former industrial sites at McDoel Switchyard in Bloomington, Indiana. Using conventional enrichment method based on soil slurry, we isolated, screened and purified two bacterial species strains PB1 and PB2. Applying the ribotyping technique using the 16S rRNA gene analysis, the strains were assigned to the genus Pseudomonas (Pseudomonas plecoglossicida strain PB1 and Pseudomonas sp. PB2). Both isolates showed promising metabolic capacity on pyrene sprayed MS agar plates during the preliminary investigations. Using time course studies in the liquid cultures at calculated concentrations 123, 64, 97 and 94 ppm for naphthalene, chrysene, fluroanthene and pyrene, P. plecoglossicida strain PB1 and Pseudomonas sp. PB2 showed partial utilization of the polynuclear aromatic hydrocarbons. Naphthalene was degraded between 26% and 40%, chrysene 14% and 16%, fluroanthene 5% and 7%; pyrene 8% and 13% by P. plecoglossicida strain PB1 and Pseudomonas sp. PB2 respectively. Based on their growth profile, we developed a model R2 = 1 to predict the degradation rate of slow polynuclear aromatic hydrocarbon-degraders where all the necessary parameters are constant. From this investigation, we confirm that the former industrial site soil microbial communities may be explored for the biorestoration of the industrial site.
Descritores: Hidrocarbonetos Aromáticos Policíclicos/metabolismo
Pseudomonas/metabolismo
-Filogenia
Pseudomonas/classificação
Pseudomonas/genética
Pirenos/metabolismo
Solo/química
Microbiologia do Solo
Biodegradação Ambiental
Carbono/química
RNA Ribossômico 16S/genética
Crisenos/metabolismo
Naftalenos/metabolismo
Nitrogênio/química
Responsável: BR1.1 - BIREME


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Id: biblio-839392
Autor: Hong, Sung-Jun; Park, Gun-Seok; Khan, Abdur Rahim; Jung, Byung Kwon; Shin, Jae-Ho.
Título: Draft genome sequence of a caprolactam degrader bacterium: Pseudomonas taiwanensis strain SJ9
Fonte: Braz. j. microbiol;48(2):187-188, April.-June 2017.
Idioma: en.
Resumo: Abstract Pseudomonas taiwanensis strain SJ9 is a caprolactam degrader, isolated from industrial wastewater in South Korea and considered to have the potential for caprolactam bioremediation. The genome of this strain is approximately 6.2 Mb (G + C content, 61.75%) with 6,010 protein-coding sequences (CDS), of which 46% are assigned to recognized functional genes. This draft genome of strain SJ9 will provide insights into the genetic basis of its caprolactam-degradation ability.
Descritores: Pseudomonas/genética
Pseudomonas/metabolismo
DNA Bacteriano/genética
DNA Bacteriano/química
Caprolactama/metabolismo
Genoma Bacteriano
Análise de Sequência de DNA
-Pseudomonas/isolamento & purificação
Composição de Bases
Microbiologia da Água
Biotransformação
Fases de Leitura Aberta
Anotação de Sequência Molecular
Resíduos Industriais
Coreia (Geográfico)
Responsável: BR1.1 - BIREME


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Id: biblio-839385
Autor: Tian, Mengyang; Du, Dongyun; Zhou, Wei; Zeng, Xiaobo; Cheng, Guojun.
Título: Phenol degradation and genotypic analysis of dioxygenase genes in bacteria isolated from sediments
Fonte: Braz. j. microbiol;48(2):305-313, April.-June 2017. tab, graf.
Idioma: en.
Projeto: Natural Science Foundation of Hubei Province; . Fundamental Research Funds for the Central Universities, South-Central University for Nationalities.
Resumo: Abstract The aerobic degradation of aromatic compounds by bacteria is performed by dioxygenases. To show some characteristic patterns of the dioxygenase genotype and its degradation specificities, twenty-nine gram-negative bacterial cultures were obtained from sediment contaminated with phenolic compounds in Wuhan, China. The isolates were phylogenetically diverse and belonged to 10 genera. All 29 gram-negative bacteria were able to utilize phenol, m-dihydroxybenzene and 2-hydroxybenzoic acid as the sole carbon sources, and members of the three primary genera Pseudomonas, Acinetobacter and Alcaligenes were able to grow in the presence of multiple monoaromatic compounds. PCR and DNA sequence analysis were used to detect dioxygenase genes coding for catechol 1,2-dioxygenase, catechol 2,3-dioxygenase and protocatechuate 3,4-dioxygenase. The results showed that there are 4 genotypes; most strains are either PNP (catechol 1,2-dioxygenase gene is positive, catechol 2,3-dioxygenase gene is negative, protocatechuate 3,4-dioxygenase gene is positive) or PNN (catechol 1,2-dioxygenase gene is positive, catechol 2,3-dioxygenase gene is negative, protocatechuate 3,4-dioxygenase gene is negative). The strains with two dioxygenase genes can usually grow on many more aromatic compounds than strains with one dioxygenase gene. Degradation experiments using a mixed culture representing four bacterial genotypes resulted in the rapid degradation of phenol. Determinations of substrate utilization and phenol degradation revealed their affiliations through dioxygenase genotype data.
Descritores: Fenol/metabolismo
Dioxigenases/genética
Dioxigenases/metabolismo
Bactérias Gram-Negativas/enzimologia
Bactérias Gram-Negativas/metabolismo
-Filogenia
Pseudomonas
Poluentes do Solo/metabolismo
Acinetobacter
DNA Bacteriano/genética
DNA Bacteriano/química
DNA Ribossômico/genética
DNA Ribossômico/química
Carbono/metabolismo
RNA Ribossômico 16S/genética
Biotransformação
Análise por Conglomerados
China
Reação em Cadeia da Polimerase
Análise de Sequência de DNA
Sedimentos Geológicos/microbiologia
Alcaligenes
Poluição Ambiental
Bactérias Gram-Negativas/classificação
Bactérias Gram-Negativas/genética
Responsável: BR1.1 - BIREME


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Id: biblio-1048596
Autor: Martins Filho, Argemiro Pereira; Medeiros, Erika V; Barbosa, Jesimiel Gomes; Barbosa, Jorge Marcos Peniche; Sobral, Júlia Kuklinsky; Motta, Cristina Souza.
Título: Combined effect of pseudomonas sp. and trichoderma aureoviride on lettuce growth promotion / Efeito combinado de Pseudomonas sp. e Trichoderma aureoviride na promoção do crescimento de alface
Fonte: Biosci. j. (Online);35(2):419-430, mar./apr. 2019. graf.
Idioma: en.
Resumo: Plant growth promotion by microorganisms may be a viable alternative to increase lettuce production through pathogens control and nutrients absorption increase. Trichoderma and Pseudomonasgenus are examples of widely studied microorganisms with the capacity to promote plant growth. However, there are still gaps regarding the action of the combined effect of these two microorganisms. Therefore, the objective of this study was to evaluate the combined effect of Pseudomonas sp. UAGF14 and Trichoderma aureoviride URM5158 on the development of lettuce plants. The experimental design was completely randomized, with five treatments: CONT (control), CM (soil with organic fertilization), CMB (soil withorganic fertilization and Pseudomonas sp.), CMF (soil with organic fertilization and T. aureoviride), and CMFB (soil with organic fertilization, Pseudomonas sp. and T. aureoviride), with ten repetitions. At 30, 40 and 60 days after sowing, the following parameters were analyzed: plant and canopy height and number of leaves. At 60 days after emergence, shoot dry matter, leaf area, root dry matter, root length and chlorophyll were analyzed. Catalase, peroxidase and polyphenol oxidase enzymatic activity were determined. The CMFB treatment had the highest means of lettuce growth promotion, confirming the synergistic effect of the combination of the two microorganism types, as it increased height, canopy, shoot and root dry matter, and chlorophyll levels compared to CONT, although did not differ from CM in some variables. Enzymatic activity was also influenced by the action of these microorganisms combined, evidencing by polyphenol oxidase increase. The CMFB or CM were efficient in promoting lettuce growth, showing positive response to the plant morphological and physiological characteristics. However, few responses were observed in lettuce plant growth in the first cycle evaluated after 60 days, compared CM and CMFB treatments, but both treatments showed superiority in lettuce plant growth submitted to CONT treatment. Therefore, further studies are needed to estimate the long-term effects of combined effect of Pseudomonas sp. UAGF14 and T. aureoviride URM5158 on crop productivity in field conditions.

A promoção do crescimento das plantas por micro-organismos pode ser uma alternativa viável para aumentar a produção de alface através de controle de patógenos e aumento da absorção de nutrientes. O gênero fúngico Trichoderma e o gênero bacteriano Pseudomonas são exemplos de micro-organismos amplamente estudados com capacidade para promover o crescimento da planta. No entanto, ainda existem lacunas quanto à ação do efeito combinado desses dois micro-organismos. Portanto, o objetivo deste estudo foi avaliar o efeito combinado de Pseudomonas UAGF14 e Trichoderma aureoviride URM5158 sobre o desenvolvimento de plantas de alface. O delineamento experimental foi completamente casualizados, com cinco tratamentos: CONT (controle, sem fertilização orgânica), CM (solo com fertilização orgânica), CMB (solo com fertilização orgânicae Pseudomonas sp.), CMF (solo com fertilização orgânica e T. aureoviride) e CMFB (solo com fertilização orgânica, Pseudomonas sp. e T. aureoviride), com dez repetições. Aos 30, 40 e 60 dias após a semeadura, foram analisados os seguintes parâmetros: altura da planta e dossel e número de folhas. Aos 60 dias após a emergência, a matéria seca da parte aérea, a área foliar, a massa seca das raízes, o comprimento radicular e a clorofila foram analisados. Catalase, peroxidase e atividade enzimática da polifenol oxidase foram determinadas. O CMFB apresentou o maior crescimento de alface, confirmando o efeito benéfico da combinação dos dois tipos de micro-organismos com a planta, na medida em que aumentou a altura, o dossel, a matéria seca da parte aérea e da raiz, e os níveis de clorofila em relação ao CONT, embora não tenha diferido do CM em algumas variáveis. As atividades enzimáticas também foram influenciadas pela ação desses micro-organismos combinados, evidenciada pelo aumento de polifenol oxidase. O CMFB ou CM foram eficientes na promoção do crescimento da alface, mostrando respostas positivas às características morfológicas e fisiológicas. Entretanto, poucas respostas foram observadas no crescimento da alface noprimeiro ciclo da planta avaliado depois de 60 dias, comparando os tratamentos CM e CMFB, mas ambos tratamentos mostraram superioridade em relação ao crescimento das plantas de alface submetidas ao tratamento controle. Por isso, são necessários futuros estudos para estimar à longo prazo o efeito combinado de Pseudomonas sp. UAGF14 e Trichoderma aureoviride URM5158 na produção de cultura em condições de campo.
Descritores: Catalase
Alface
CHLOROFLUOROCARBONS, METHANEABDOMEN
-Pseudomonas
Trichoderma
Responsável: BR396.1 - Biblioteca Central


  9 / 171 LILACS  
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Id: lil-797971
Autor: Silva, Sanrrangers Sales; Ribeiro, Maximilo de Oliveira; Gomes, Francisco Isaac Fernandes; Chaves, Hellíada Vasconcelos; Silva, Antonio Alfredo Rodrigues e; Zanin, Iriana Carla Junqueira; Barbosa, Francisco Cesar Barroso.
Título: Occurrence and antimicrobial susceptibility of enteric rods and pseudomonads isolated from the dental prostheses biofilm
Fonte: J. appl. oral sci;24(5):462-471, Sept.-Oct. 2016. tab.
Idioma: en.
Projeto: CNPq - National Council for Scientific and Technological Development.
Resumo: ABSTRACT Aspiration of oral bacteria leads to cardiac and respiratory infectious diseases and dentures can act as a reservoir for pathogenic microorganisms. Objective: To determine the occurrence and the in vitro antimicrobial susceptibility of enteric rods and pseudomonads from the denture biofilm of 52 subjects at the Center for Dental Specialties of Sobral/ Ceara, Brazil. Material and Methods: Denture biofilm was collected and samples plated on MacConkey agar. The isolated bacterial colonies were identified using the BBL Crystal enteric/non-fermenter system. Antibiotic bacterial susceptibility was assessed by the disc diffusion method of amoxicillin, amoxicillin/clavulanic acid, doxycycline, tetracycline, tobramycin, imipenem, cefotaxime, and ciprofloxacin. The Minimum Inhibitory Concentration (MIC) of cefotaxime, tobramycin, doxycycline, imipenem, and ciprofloxacin was determined for 40 species by E-test. Results: 34 subjects (65.4%) harbored enteric rods in their prostheses. Klebsiella pneumoniae (26.5%), Escherichia coli (23.5%), and Enterobacter aerogenes (23.5%) were the most prevalent species. All organisms were susceptible to ciprofloxacin and most species were resistant to amoxicillin or amoxicillin/clavulanic acid, demonstrating variable sensitivity patterns to other antimicrobials. However, the MIC showed the emergence of strains with reduced sensitivity to ciprofloxacin (MIC90≥3 μg/ mL) and cefotaxime (MIC90≥2 μg/mL). Conclusion: The findings show high prevalence of nosocomial diseases-related bacterial species and low susceptibility to antimicrobial drugs. Therefore, these results imply caution against the indiscriminate use of broad spectrum antibiotics in dental practice.
Descritores: Pseudomonas/isolamento & purificação
Prótese Dentária/microbiologia
Biofilmes/crescimento & desenvolvimento
Enterobacteriaceae/isolamento & purificação
-Pseudomonas/efeitos dos fármacos
Valores de Referência
Fatores de Tempo
Testes de Sensibilidade Microbiana
Distribuição por Sexo
Distribuição por Idade
Estatísticas não Paramétricas
Farmacorresistência Bacteriana Múltipla
Enterobacteriaceae/efeitos dos fármacos
Antibacterianos/farmacologia
Limites: Seres Humanos
Masculino
Feminino
Adulto
Meia-Idade
Idoso
Idoso de 80 Anos ou mais
Responsável: BR1.1 - BIREME


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Id: biblio-1015826
Autor: Vásquez-Ponce, Felipe; Higuera-Llantén, Sebastián; Pavlov, María Soledad; Ramírez-Orellana, Ramón; Marshall, Sergio H; Olivares-Pacheco, Jorge.
Título: Alginate overproduction and biofilm formation by psychrotolerant Pseudomonas mandelii depend on temperature in Antarctic marine sediments
Fonte: Electron. j. biotechnol;28:27-34, July. 2017. tab, ilus, graf.
Idioma: en.
Projeto: Dirección de Investigación, Pontificia Universidad Católica de Valparaíso.
Resumo: Background: In recent years, Antarctica has become a key source of biotechnological resources. Native microorganisms have developed a wide range of survival strategies to adapt to the harsh Antarctic environment, including the formation of biofilms. Alginate is the principal component of the exopolysaccharide matrix in biofilms produced by Pseudomonas, and this component is highly demanded for the production of a wide variety of commercial products. There is a constant search for efficient alginate-producing organisms. Results: In this study, a novel strain of Pseudomonas mandelii isolated from Antarctica was characterized and found to overproduce alginate compared with other good alginate producers such as Pseudomonas aeruginosa and Pseudomonas fluorescens. Alginate production and expression levels of the alginate operon were highest at 4°C. It is probable that this alginate-overproducing phenotype was the result of downregulated MucA, an anti-sigma factor of AlgU. Conclusion: Because biofilm formation is an efficient bacterial strategy to overcome stressful conditions, alginate overproduction might represent the best solution for the successful adaptation of P. mandelii to the extreme temperatures of the Antarctic. Through additional research, it is possible that this novel P. mandelii strain could become an additional source for biotechnological alginate production.
Descritores: Pseudomonas/metabolismo
Alginatos/metabolismo
-Polissacarídeos Bacterianos/metabolismo
Pseudomonas/crescimento & desenvolvimento
Pseudomonas/genética
Adaptação Biológica
Temperatura Baixa
Microscopia Confocal
Biofilmes
Feófitas
Tipagem de Sequências Multilocus
Reação em Cadeia da Polimerase em Tempo Real
Regiões Antárticas
Responsável: CL1.1 - Biblioteca Central



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