Base de dados : MEDLINE
Pesquisa : G06.120 [Categoria DeCS]
Referências encontradas : 24634 [refinar]
Mostrando: 1 .. 10   no formato [Detalhado]

página 1 de 2464 ir para página                         

  1 / 24634 MEDLINE  
              next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29399876
[Au] Autor:Martínez-García S; Rodríguez-Martínez S; Cancino-Diaz ME; Cancino-Diaz JC
[Ad] Endereço:Departamento de Microbiología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Ciudad de México, Mexico.
[Ti] Título:Extracellular proteases of Staphylococcus epidermidis: roles as virulence factors and their participation in biofilm.
[So] Source:APMIS;126(3):177-185, 2018 Mar.
[Is] ISSN:1600-0463
[Cp] País de publicação:Denmark
[La] Idioma:eng
[Ab] Resumo:Staphylococci produce a large number of extracellular proteases, some of which are considered as potential virulence factors. Staphylococcus epidermidis is a causative agent of nosocomial infections in medical devices by the formation of biofilms. It has been proposed that proteases contribute to the different stages of biofilm formation. S. epidermidis secretes a small number of extracellular proteases, such as serine protease Esp, cysteine protease EcpA, and metalloprotease SepA that have a relatively low substrate specificity. Recent findings indicate a significant contribution of extracellular proteases in biofilm formation through the proteolytic inactivation of adhesion molecules. The objective of this work is to provide an overview of the current knowledge of S. epidermidis' extracellular proteases during pathogenicity, especially in the different stages of biofilm formation.
[Mh] Termos MeSH primário: Proteínas de Bactérias/metabolismo
Biofilmes/crescimento & desenvolvimento
Cisteína Proteases/metabolismo
Metaloendopeptidases/metabolismo
Serina Proteases/metabolismo
Staphylococcus epidermidis/enzimologia
[Mh] Termos MeSH secundário: Moléculas de Adesão Celular/metabolismo
Infecção Hospitalar/microbiologia
Infecção Hospitalar/patologia
Seres Humanos
Infecções Estafilocócicas/microbiologia
Infecções Estafilocócicas/patologia
Staphylococcus epidermidis/metabolismo
Staphylococcus epidermidis/patogenicidade
Fatores de Virulência/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Nm] Nome de substância:
0 (Bacterial Proteins); 0 (Cell Adhesion Molecules); 0 (Virulence Factors); EC 3.4.- (Cysteine Proteases); EC 3.4.- (Serine Proteases); EC 3.4.24.- (Metalloendopeptidases); EC 3.4.24.- (SepA protein, Staphylococcus epidermidis)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180206
[St] Status:MEDLINE
[do] DOI:10.1111/apm.12805


  2 / 24634 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29324833
[Au] Autor:Lyte M; Brown DR
[Ad] Endereço:Department of Veterinary Microbiology and Preventive Medicine, College of Veterinary Medicine, Iowa State University, Ames, Iowa, United States of America.
[Ti] Título:Evidence for PMAT- and OCT-like biogenic amine transporters in a probiotic strain of Lactobacillus: Implications for interkingdom communication within the microbiota-gut-brain axis.
[So] Source:PLoS One;13(1):e0191037, 2018.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The ability of prokaryotic microbes to produce and respond to neurochemicals that are more often associated with eukaryotic systems is increasingly recognized through the concept of microbial endocrinology. Most studies have described the phenomena of neurochemical production by bacteria, but there remains an incomplete understanding of the mechanisms by which microbe- or host-derived neuroactive substances can be recognized by bacteria. Based on the evolutionary origins of eukaryotic solute carrier transporters, we hypothesized that bacteria may possess an analogous uptake function for neuroactive biogenic amines. Using specific fluorescence-based assays, Lactobacillus salivarius biofilms appear to express both plasma membrane monoamine transporter (PMAT)- and organic cation transporter (OCT)-like uptake of transporter-specific fluorophores. This phenomenon is not distributed throughout the genus Lactobacillus as L. rhamnosus biofilms did not take up these fluorophores. PMAT probe uptake into L. salivarius biofilms was attenuated by the protonophore CCCP, the cation transport inhibitor decynium-22, and the natural substrates norepinephrine, serotonin and fluoxetine. These results provide the first evidence, to our knowledge, for the existence of PMAT- and OCT-like uptake systems in a bacterium. They also suggest the existence of a hitherto unrecognized mechanism by which a probiotic bacterium may interact with host signals and may provide a means to examine microbial endocrinology-based interactions in health and disease that are part of the larger microbiota-gut-brain axis.
[Mh] Termos MeSH primário: Aminas Biogênicas/metabolismo
Proteínas de Membrana Transportadoras/metabolismo
Probióticos
[Mh] Termos MeSH secundário: Biofilmes
Espectrometria de Fluorescência
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Biogenic Amines); 0 (Membrane Transport Proteins)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180112
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0191037


  3 / 24634 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Svidzinski, Terezinha Inez Estivalet
Texto completo
[PMID]:29262785
[Au] Autor:da Silva EM; Mansano ESB; Miazima ES; Rodrigues FAV; Hernandes L; Svidzinski TIE
[Ad] Endereço:Department of Medical Mycology, State University of Maringá, Av. Colombo, 5760, C.P, Maringá, PR, 87020-900, Brazil.
[Ti] Título:Radiation used for head and neck cancer increases virulence in Candida tropicalis isolated from a cancer patient.
[So] Source:BMC Infect Dis;17(1):783, 2017 Dec 20.
[Is] ISSN:1471-2334
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Studies have shown that radiation from radiotherapy increases the yeast colonization of patients. However it is not clear, if such radiation alters the yeast itself. The aim of the present study was therefore to report the direct impact of gamma radiation on Candida tropicalis. METHODS: C. tropicalis was obtained from a patient with a carcinoma, a suspension of this yeast containing 2.0 × 10 colony forming units per milliliter was prepared. It was submitted to gamma radiation dosage similar to that used in the treatment of head and neck cancer. After a cumulative dose of 7200 cGy some virulence attributes of C. tropicalis, including macro and micromorphological characteristics, adhesion and biofilm abilities, murine experimental infection and phagocytosis resistance were evaluated on irradiated and non-irradiated yeasts. RESULTS: After irradiation the colony morphology of the yeast was altered from a ring format to a smooth appearance in most colonies. Scanning electron microscopy revealed notable differences in the structures of both these colonies and the yeast cells, with the loss of pseudohyphae following irradiation and an increase in extracellular matrix production. The adherence and biofilm production of the yeast was greater following irradiation, both in terms of the number of yeasts and total biomass production on several abiotic surfaces and TR146 cells. The phagocytic index of the irradiated yeasts was not statistically different; however, the presence of cellular debris was detected in the kidneys of infected animals. Mice infected with irradiated yeasts developed an infection at the site of the yeast inoculation, although systemic infection was unchanged. CONCLUSIONS: Our findings show for the first time that C. tropicalis, one of the most important yeasts from colonization, which cause fatal candidemia in cancer patients, is affected by gamma irradiation, with changes to its virulence profile.
[Mh] Termos MeSH primário: Candida tropicalis
Candidíase Invasiva
Neoplasias de Cabeça e Pescoço
Radioterapia/efeitos adversos
Virulência/efeitos da radiação
[Mh] Termos MeSH secundário: Biofilmes
Candida tropicalis/patogenicidade
Candida tropicalis/efeitos da radiação
Neoplasias de Cabeça e Pescoço/complicações
Neoplasias de Cabeça e Pescoço/radioterapia
Seres Humanos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171222
[St] Status:MEDLINE
[do] DOI:10.1186/s12879-017-2879-6


  4 / 24634 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29458674
[Au] Autor:Nair S; Poonacha N; Desai S; Hiremath D; Tuppad D; Mohan T; Chikkamadaiah R; Durgaiah M; Kumar S; Channabasappa S; Vipra A; Sharma U
[Ad] Endereço:GangaGen Biotechnologies Pvt Ltd., Bangalore, India.
[Ti] Título:Restoration of sensitivity of a diverse set of drug-resistant Staphylococcus clinical strains by bactericidal protein P128.
[So] Source:J Med Microbiol;67(3):296-307, 2018 Mar.
[Is] ISSN:1473-5644
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:PURPOSE: P128, a phage-derived lysin, exerts antibacterial activity on staphylococci by cleaving the pentaglycine-bridge of peptidoglycan. We sought to determine whether the presence of P128 could re-sensitize drug-resistant bacteria to antibiotics by virtue of its cell wall degrading property. METHODOLOGY: P128 was tested in combination with standard-of-care (SoC) drugs by chequerboard assays on planktonic cells and biofilms of strains individually resistant to these drugs. The bactericidal effect of P128 and drug combinations on planktonic cells and biofilms was measured by c.f.u. reduction assays. A mouse model of MRSA bacteraemia was used to test the efficacy of P128 and oxacillin in combination. RESULTS: A combination of sub-MIC P128 (0.025-0.20 µg ml ) and 0.5 µg ml of oxacillin resulted in inhibition of bacterial growth in four MRSA strains. Similar results were seen with all the other drugs tested, wherein sub-MIC of P128 re-sensitized S. aureus and CoNS strains to SoC drugs. The chequerboard assays on strains of S. aureus and CoNS showed that combinations of P128 and antibiotics consistently inhibited bacterial growth on biofilms. Data from scanning electron microscopy and c.f.u. reduction assays on drug-resistant S. aureus and CoNS demonstrated that sub-MICs of P128 and SoC antibiotics could kill biofilm-embedded bacteria. In vivo, a combination of sub-therapeutic doses of P128 and oxacillin could help protect animals from fatal bacteraemia. CONCLUSION: The ability of P128 to re-sensitize bacteria to SoC drugs suggests that combinations of P128 and SoC antibiotics can potentially be developed to treat infections caused by drug-resistant strains of staphylococci.
[Mh] Termos MeSH primário: Antibacterianos/farmacologia
Farmacorresistência Bacteriana/efeitos dos fármacos
Proteínas Recombinantes de Fusão/farmacologia
Staphylococcus aureus/efeitos dos fármacos
[Mh] Termos MeSH secundário: Animais
Biofilmes/efeitos dos fármacos
Biofilmes/crescimento & desenvolvimento
Modelos Animais de Doenças
Seres Humanos
Staphylococcus aureus Resistente à Meticilina/efeitos dos fármacos
Camundongos
Testes de Sensibilidade Microbiana
Oxacilina/farmacologia
Proteínas Recombinantes de Fusão/metabolismo
Infecções Estafilocócicas/microbiologia
Staphylococcus aureus/crescimento & desenvolvimento
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Anti-Bacterial Agents); 0 (P128 antistaphylococcal chimeric protein); 0 (Recombinant Fusion Proteins); UH95VD7V76 (Oxacillin)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180308
[Lr] Data última revisão:
180308
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180221
[St] Status:MEDLINE
[do] DOI:10.1099/jmm.0.000697


  5 / 24634 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29458673
[Au] Autor:Morse DJ; Wilson MJ; Wei X; Lewis MAO; Bradshaw DJ; Murdoch C; Williams DW
[Ad] Endereço:1​Oral and Biomedical Sciences, School of Dentistry, Cardiff University, Cardiff, UK.
[Ti] Título:Denture-associated biofilm infection in three-dimensional oral mucosal tissue models.
[So] Source:J Med Microbiol;67(3):364-375, 2018 Mar.
[Is] ISSN:1473-5644
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:PURPOSE: In vitro analyses of virulence, pathogenicity and associated host cell responses are important components in the study of biofilm infections. The Candida-related infection, denture-associated oral candidosis, affects up to 60 % of denture wearers and manifests as inflammation of palatal tissues contacting the denture-fitting surface. Commercially available three-dimensional tissue models can be used to study infection, but their use is limited for many academic research institutions, primarily because of the substantial purchase costs. The aim of this study was to develop and evaluate the use of in vitro tissue models to assess infections by biofilms on acrylic surfaces through tissue damage and Candida albicans virulence gene expression. METHODOLOGY: In vitro models were compared against commercially available tissue equivalents (keratinocyte-only, SkinEthic; full-thickness, MatTek Corporation). An in vitro keratinocyte-only tissue was produced using a cancer-derived cell line, TR146, and a full-thickness model incorporating primary fibroblasts and immortalised normal oral keratinocytes was also generated. The in vitro full-thickness tissues incorporated keratinocytes and fibroblasts, and have potential for future further development and analysis. RESULTS: Following polymicrobial infection with biofilms on acrylic surfaces, both in-house developed models were shown to provide equivalent results to the SkinEthic and MatTek models in terms of tissue damage: a significant (P<0.05) increase in LDH activity for mixed species biofilms compared to uninfected control, and no significant difference (P>0.05) in the expression of most C. albicans virulence genes when comparing tissue models of the same type. CONCLUSION: Our results confirm the feasibility and suitability of using these alternative in vitro tissue models for such analyses.
[Mh] Termos MeSH primário: Biofilmes/crescimento & desenvolvimento
Candidíase Bucal/microbiologia
Dentaduras/microbiologia
Interações Hospedeiro-Patógeno
Mucosa Bucal/microbiologia
[Mh] Termos MeSH secundário: Candida albicans/genética
Candida albicans/patogenicidade
Candida albicans/fisiologia
Linhagem Celular
Coinfecção/microbiologia
Fibroblastos/microbiologia
Seres Humanos
Queratinócitos/microbiologia
Polimetil Metacrilato
Estomatite sob Prótese
Virulência
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
9011-14-7 (Polymethyl Methacrylate)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180308
[Lr] Data última revisão:
180308
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180221
[St] Status:MEDLINE
[do] DOI:10.1099/jmm.0.000677


  6 / 24634 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29458668
[Au] Autor:Al-Ahmad A; Muzafferiy F; Anderson AC; Wölber JP; Ratka-Krüger P; Fretwurst T; Nelson K; Vach K; Hellwig E
[Ad] Endereço:1​Department of Operative Dentistry and Periodontology, Faculty of Medicine, Medical Center - University of Freiburg, Germany.
[Ti] Título:Shift of microbial composition of peri-implantitis-associated oral biofilm as revealed by 16S rRNA gene cloning.
[So] Source:J Med Microbiol;67(3):332-340, 2018 Mar.
[Is] ISSN:1473-5644
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:PURPOSE: Micro-organisms are important triggers of peri-implant inflammation and analysing their diversity is necessary for peri-implantitis treatment. This study aimed to analyse and compare the microbiota associated with individuals with peri-implantitis, as well as clinically healthy implant sites. METHODOLOGY: Subgingival biofilm samples were taken from 10 individuals with peri-implantitis and from at least 1 clinically healthy implant. DNA was extracted and bacterial 16S rRNA genes were amplified using universal primers. After cloning the PCR-products, amplified inserts of positive clones were digested using restriction endonucleases, and the chosen clones were sequenced. The 16S rDNA-sequences were compared to those from the public sequence databases GenBank, EMBL and DDBJ to determine the corresponding taxa. RESULTS: Differing distributions of taxa belonging to the phyla Firmicutes, Bacteroidetes, Fusobacteria, Actinobacteria, Proteobacteria, Synergistetes, Spirochaetae and TM 7 were detected in both the healthy implant (HI) and the peri-implantitis (PI) groups. A significantly higher relative abundance of phylum Bacteroidetes, as well as of the species Fusobacterium nucleatum, were found in the PI group (P<0.05). The putative periodontal red complex (Porphyromonas gingivalis, Tannerella forsythia) was also detected at significantly higher levels in the PI group (P<0.05), whereas the yellow group, as well as the species Veillonella dispar, tended to be associated with the HI group. CONCLUSION: A shift in the healthy subgingival microbiota was shown in peri-implantitis-associated biofilm. Anaerobic Gram-negative periopathogens, including P. gingivalis and T. forsythia, seem to play an important role in peri-implantitis development and should be considered in treatment and prevention strategies.
[Mh] Termos MeSH primário: Bactérias/isolamento & purificação
Biofilmes
Microbiota/genética
Peri-Implantite/microbiologia
RNA Ribossômico 16S/genética
[Mh] Termos MeSH secundário: Idoso
Idoso de 80 Anos ou mais
Bactérias/classificação
Bactérias/genética
Carga Bacteriana
Fenômenos Fisiológicos Bacterianos
Bacteroides/genética
Bacteroides/isolamento & purificação
Feminino
Fusobacterium nucleatum/genética
Fusobacterium nucleatum/isolamento & purificação
Genes de RNAr
Gengiva/microbiologia
Seres Humanos
Masculino
Meia-Idade
Porphyromonas gingivalis/genética
Porphyromonas gingivalis/isolamento & purificação
Prevotella intermedia/genética
Prevotella intermedia/isolamento & purificação
Análise de Sequência de DNA
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (RNA, Ribosomal, 16S)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180308
[Lr] Data última revisão:
180308
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180221
[St] Status:MEDLINE
[do] DOI:10.1099/jmm.0.000682


  7 / 24634 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29215338
[Au] Autor:Kart D; Kustimur AS; Sagiroglu M; Kalkanci A
[Ad] Endereço:Department of Pharmaceutical Microbiology, Hacettepe University Faculty of Pharmacy, Ankara, Turkey.
[Ti] Título:Evaluation of Antimicrobial Durability and Anti-Biofilm Effects in Urinary Catheters Against Clinical Isolates and Reference Strains.
[So] Source:Balkan Med J;34(6):546-552, 2017 12 01.
[Is] ISSN:2146-3131
[Cp] País de publicação:Turkey
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: and biofilms are major causes of catheter-associated urinary tract infections. Antimicrobial-coated or impregnated urinary catheters are seen as a possible way to prevent these infections. AIMS: To determine the biofilm-forming ability of 89 isolates from urinary tract infections and to compare several urinary catheters for antimicrobial durability and the inhibitory effects on biofilm formation of different laboratory strains and clinical isolates of . STUDY DESIGN: experimental study. METHODS: The biofilm forming ability of isolates was determined by the crystal violet staining and plate counting methods. For comparison of urinary catheters, biofilms of 45 isolates from the catheter samples of hospitalized patients and five laboratory strains of ATCC25922, ATCC35984, ATCC27853, ATCC29212 and ATCC90028 were formed on the catheters in 24-well tissue culture plates. Scanning electron microscopy analysis was performed to observe biofilms. RESULTS: All 89 isolates were found to be biofilm positive. Nitrofurazone-impregnated catheters significantly reduced the cell counts of isolates and completely inhibited the formation of and biofilms compared with the others. Regarding reduction of biofilm cell counts, a hydrophilic-coated catheter was more effective against , whereas a silver-coated catheter was found to be more effective against . The nitrofurazone-impregnated catheter had the best antimicrobial durability. CONCLUSION: Urine isolates of had considerable ability with respect to biofilm formation. The nitrofurazone-impregnated catheter was the most effective against all tested bacteria; however, the effect of a hydrophilic or silver-coated catheter depends on the species present in it.
[Mh] Termos MeSH primário: Anti-Infecciosos/farmacologia
Biofilmes/efeitos dos fármacos
Infecções Relacionadas a Cateter/microbiologia
Cateteres de Demora/microbiologia
Enterococcus faecalis/efeitos dos fármacos
Nitrofurazona/farmacologia
Infecções Urinárias/microbiologia
[Mh] Termos MeSH secundário: Infecções Relacionadas a Cateter/prevenção & controle
Materiais Revestidos Biocompatíveis
Enterococcus faecalis/isolamento & purificação
Seres Humanos
Técnicas In Vitro
Testes de Sensibilidade Microbiana
Silicones
Prata
Cateterismo Urinário/efeitos adversos
Infecções Urinárias/prevenção & controle
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Anti-Infective Agents); 0 (Coated Materials, Biocompatible); 0 (Silicones); 3M4G523W1G (Silver); X8XI70B5Z6 (Nitrofurazone)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180308
[Lr] Data última revisão:
180308
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171208
[St] Status:MEDLINE
[do] DOI:10.4274/balkanmedj.2016.1853


  8 / 24634 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28743239
[Au] Autor:Senneby A; Davies JR; Svensäter G; Neilands J
[Ad] Endereço:Department of Oral and Maxillofacial Radiology, Malmö University, Faculty of Odontology, 205 06, Malmö, SE, Sweden.
[Ti] Título:Acid tolerance properties of dental biofilms in vivo.
[So] Source:BMC Microbiol;17(1):165, 2017 Jul 25.
[Is] ISSN:1471-2180
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: The ecological plaque hypothesis explains caries development as the result of the enrichment of acid tolerant bacteria in dental biofilms in response to prolonged periods of low pH. Acid production by an acid tolerant microflora causes demineralisation of tooth enamel and thus, individuals with a greater proportion of acid tolerant bacteria would be expected to be more prone to caries development. Biofilm acid tolerance could therefore be a possible biomarker for caries prediction. However, little is known about the stability of biofilm acid tolerance over time in vivo or the distribution throughout the oral cavity. Therefore the aim of this study was to assess intra-individual differences in biofilm acid-tolerance between different tooth surfaces and inter-individual variation as well as stability of acid tolerance over time. RESULTS: The majority of the adolescents showed low scores for biofilm acid tolerance. In 14 of 20 individuals no differences were seen between the three tooth sites examined. In the remaining six, acid-tolerance at the premolar site differed from one of the other sites. At 51 of 60 tooth sites, acid-tolerance at baseline was unchanged after 1 month. However, acid tolerance values changed over a 1-year period in 50% of the individuals. CONCLUSIONS: Biofilm acid tolerance showed short-term stability and low variation between different sites in the same individual suggesting that the acid tolerance could be a promising biological biomarker candidate for caries prediction. Further evaluation is however needed and prospective clinical trials are called for to evaluate the diagnostic accuracy.
[Mh] Termos MeSH primário: Ácidos/farmacologia
Biofilmes/efeitos dos fármacos
Placa Dentária/microbiologia
[Mh] Termos MeSH secundário: Adolescente
Bactérias/classificação
Bactérias/isolamento & purificação
Fenômenos Fisiológicos Bacterianos/efeitos dos fármacos
Criança
Feminino
Seres Humanos
Masculino
Boca/microbiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Acids)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180308
[Lr] Data última revisão:
180308
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170727
[St] Status:MEDLINE
[do] DOI:10.1186/s12866-017-1074-7


  9 / 24634 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28278777
[Au] Autor:Lu YF; Ma LJ; Ma L; Shan B; Chang JJ
[Ad] Endereço:a School of Ecology and Environmental Science, Yunnan University , Kunming , People's Republic of China.
[Ti] Título:Improvement of start-up and nitrogen removal of the anammox process in reactors inoculated with conventional activated sludge using biofilm carrier materials.
[So] Source:Environ Technol;39(1):59-67, 2018 Jan.
[Is] ISSN:0959-3330
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The start-up of the anaerobic ammonium oxidation (anammox) process in three up-flow column reactors seeded with common mixed activated sludge and added with three materials, sponge (R1), sponge + volcanic rock (R2) and sponge + charcoal (R3), as carriers for biofilm formation were comparatively investigated in this study. The supplement of volcanic rock and charcoal could significantly shorten the start-up time of the anammox process, which primarily occurred in the activity-enhanced phase, with ammonium and nitrite removal efficiencies stabilized above 92.5% and 93.4% after an operation period of 145, 105 and 121 d for R1, R2 and R3, respectively. After the successful anammox start-up, R2 performed significantly better in TN removal (p < .05), achieving an average rate of 91.0% and 191.5 g N m d compared to R1 of 88.4% and 172.1 g N m d , and R3 of 89.9% and 180.1 g N m d in the steady running phase. The ratios of consumed [Formula: see text] and generated [Formula: see text]/consumed [Formula: see text] after anammox start-up were lower than the theoretical values, probably suggesting the simultaneous existences of anammox, denitrification as well as nitrification processes in the reactors. A reddish brown biofilm was wrapped on the carriers and morphological detection of biofilm displayed the presentations of thick and compact floc aggregates and some filamentous bacteria on the sponge, and spherical-, ovoid- and shortrod-shaped microorganisms on the volcanic rock and charcoal. Using porous material as carrier for biofilm development is an effective strategy for practical application of the anammox reactor.
[Mh] Termos MeSH primário: Biofilmes/crescimento & desenvolvimento
Nitrogênio/metabolismo
Eliminação de Resíduos Líquidos/métodos
Poluentes Químicos da Água/análise
[Mh] Termos MeSH secundário: Compostos de Amônio
Reatores Biológicos/microbiologia
Carvão Vegetal
Crescimento Quimioautotrófico
Desnitrificação
Nitrificação
Nitritos
Nitrogênio/análise
Oxirredução
Esgotos/microbiologia
Poluentes Químicos da Água/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Ammonium Compounds); 0 (Nitrites); 0 (Sewage); 0 (Water Pollutants, Chemical); 16291-96-6 (Charcoal); N762921K75 (Nitrogen)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180308
[Lr] Data última revisão:
180308
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170311
[St] Status:MEDLINE
[do] DOI:10.1080/09593330.2017.1294624


  10 / 24634 MEDLINE  
              first record previous record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29182216
[Au] Autor:Viitaniemi L; Abdulmajeed A; Sulaiman T; Söderling E; Närhi T
[Ad] Endereço:Department of Prosthetic Dentistry and Stomatognathic Physiology, University of Turku, FINLAND.
[Ti] Título:Adhesion and Early Colonization of S. Mutans on Lithium Disilicate Reinforced Glass-Ceramics, Monolithic Zirconia and Dual Cure Resin Cement.
[So] Source:Eur J Prosthodont Restor Dent;25(4):228-234, 2017 Dec 01.
[Is] ISSN:0965-7452
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:OBJECTIVE: Monolithic zirconia and glass ceramics are increasingly used in implant crowns. Limited data is available on bacterial adhesion and early biofilm formation on these materials. METHODS: Four different materials were investigated: (1) Lithium disilicate glass-ceramics (LDS), (2) Fully stabilized zirconia (FSZ), (3) Partially stabilized zirconia (PSZ), and (4) Dual curing cement (DCC). The materials' surfaces were characterized with spinning disc confocal microscopy and by water contact angle and surface free energy (SFE) measurements. For the adhesion tests the materials were rolled in suspensions of Streptococcus mutans. Early biofilm formation was studied on the materials and allowing the biofilms to form for 24 h. S. mutans cell counts were determined by plate culturing. ANOVA and post-hoc Tukey's tests (p⟨0.05) were used for statistical evaluation. RESULTS: The LDS surfaces were clearly hydrophilic with the highest SFE value (p⟨0.001). For S. mutans adhesion, the ranking of the materials from lowest to highest was: LDS = FSZ ⟨ DCC ⟨ PSZ (p⟨0.05). No significant differences among the materials were noticed in biofilm formation. CONCLUSIONS: LDS has lower S.mutans adhesion than other materials examined in this study, but the difference was not reflected in early biofilm formation.
[Mh] Termos MeSH primário: Aderência Bacteriana
Biofilmes
Cerâmica
Materiais Dentários
Porcelana Dentária
Cimentos de Resina
Streptococcus mutans/isolamento & purificação
Streptococcus mutans/fisiologia
Zircônio
[Mh] Termos MeSH secundário: Fatores de Tempo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (DCR cement); 0 (Dental Materials); 0 (Resin Cements); 0 (lithia disilicate); 12001-21-7 (Dental Porcelain); 85422-94-2 (Glass ceramics); C6V6S92N3C (Zirconium); S38N85C5G0 (zirconium oxide)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180306
[Lr] Data última revisão:
180306
[Sb] Subgrupo de revista:D
[Da] Data de entrada para processamento:171129
[St] Status:MEDLINE
[do] DOI:10.1922/EJPRD_01711Viitaniemi07



página 1 de 2464 ir para página                         
   


Refinar a pesquisa
  Base de dados : MEDLINE Formulário avançado   

    Pesquisar no campo  
1  
2
3
 
           



Search engine: iAH v2.6 powered by WWWISIS

BIREME/OPAS/OMS - Centro Latino-Americano e do Caribe de Informação em Ciências da Saúde