| polymicrobial keratitis: acanthamoeba and infectious crystalline keratopathy. | to report the early presentation, cause, and successful medical management of combined acanthamoeba keratitis (ak) and infectious crystalline keratopathy (ick). | 2009 | 19327742 |
| antimicrobial action of a filling paste used in pulp therapy in primary teeth under different storage conditions. | compare the antimicrobial effectiveness of common antimicrobial paste immediately after pulp therapy and in different storage conditions. | 2008 | 19358376 |
| in vitro adherence of oral streptococci to zirconia core and veneering glass-ceramics. | plaque formation on dental ceramics may cause gingival inflammation and secondary caries. this in vitro study compared the susceptibility of various dental ceramics to adhere oral streptococci, and verified the influence of substratum surface roughness and surface hydrophobicity. three zirconia ceramic materials and three veneering glass-ceramics were investigated. fifteen test specimens were prepared for each material, polished, and surface roughness and hydrophobicity were determined. after in ... | 2009 | 19388092 |
| clostridium perfringens liver abscess after pancreatic resection. | liver abscess is a rare complication after pancreatectomy. clostridium perfingens is a rare cause of intrahepatic infections. | 2009 | 19388837 |
| [endocarditis and splenic abscesses]. | | 2003 | 12666319 |
| in vitro antimicrobial activity of caesalpinia ferrea martius fruits against oral pathogens. | in the amazon region of brazil, the fruits of caesalpinia ferrea martius (brazilian ironwood) are widely used as an antimicrobial and healing medicine in many situations including oral infections. this study aimed to evaluate the antimicrobial activity of caesalpinia ferrea martius fruit extract against oral pathogens. | 2009 | 19397986 |
| the antibacterial properties of solid supported liposomes on streptococcus oralis biofilms. | a novel system for the delivery of drugs to bacterial biofilms has been developed. the system is based on the use of anionic and cationic liposomes as drug carriers adsorbed on the surface of zinc citrate particles. the adsorption process results in the formation of solid supported vesicles (ssvs) which aids the stabilisation of the liposomes. anionic liposomes have been prepared by incorporation of phosphatidylinositol (pi) into dipalmitoylphosphatidylcholine (dppc) liposomes and cationic lipos ... | 2003 | 12711168 |
| polymicrobial keratitis after a collagen cross-linking procedure with postoperative use of a contact lens: a case report. | : to report a case of polymicrobial keratitis caused by streptococcus salivarius, streptococcus oralis, and coagulase-negative staphylococcus sp. in a patient who underwent collagen cross-linking for keratoconus. | 2009 | 19411973 |
| the microbiota on different oral surfaces in healthy children. | knowledge of the early oral colonization patterns could provide a better understanding of oral biofilm development and disease initiation that in turn could be the basis for early preventive programmes. | 2009 | 19416446 |
| population structure of streptococcus oralis. | streptococcus oralis is a member of the normal human oral microbiota, capable of opportunistic pathogenicity; like related oral streptococci, it exhibits appreciable phenotypic and genetic variation. a multilocus sequence typing (mlst) scheme for s. oralis was developed and the resultant data analysed to examine the population structure of the species. analysis of 113 isolates, confirmed as belonging to the s. oralis/mitis group by 16s rrna gene sequencing, characterized the population as highly ... | 2009 | 19423627 |
| bacterial contamination of filtered intraoral bone chips. | intraoral bony defects can be filled with bony particles that are collected in a titanium filter. the aim of this study was to determine quantitatively and qualitatively the degree of this contamination. over a period of 3 months, bony particles were collected from 50 patients undergoing oral surgery. the bony particles were scraped off the filter, resuspended, and incubated aerobically and anaerobically on human blood agar media. colony forming units (cfu) were determined as well as the most co ... | 2006 | 17052892 |
| [early prosthetic joint infection due to streptococcus oralis]. | | 2009 | 19477047 |
| identification of a bioactive compound isolated from brazilian propolis type 6. | a prenylated benzophenone, hyperibone a, was isolated from the hexane fraction of brazilian propolis type 6. its structure was determined by spectral analysis including 2d nmr. this compound exhibited cytotoxic activity against hela tumor cells (ic(50)=0.1756microm), strong antimicrobial activity (mic range-0.73-6.6microg/ml; mbc range-2.92-106microg/ml) against streptococcus mutans, streptococcus sobrinus, streptococcus oralis, staphylococcus aureus, and actinomyces naeslundii, and the results ... | 2009 | 19497755 |
| oral biofilm models for mechanical plaque removal. | in vitro plaque removal studies require biofilm models that resemble in vivo dental plaque. here, we compare contact and non-contact removal of single and dual-species biofilms as well as of biofilms grown from human whole saliva in vitro using different biofilm models. bacteria were adhered to a salivary pellicle for 2 h or grown after adhesion for 16 h, after which, their removal was evaluated. in a contact mode, no differences were observed between the manual, rotating, or sonic brushing; and ... | 2010 | 19565279 |
| transient acid-impairment of growth ability of oral streptococcus, actinomyces, and lactobacillus: a possible ecological determinant in dental plaque. | dental plaque ph decreases to about 4 through bacterial fermentation of carbohydrates and this low ph is maintained for from several minutes to about an hour. repeated acidification causes demineralization of the tooth surface, resulting in caries formation. the acidification also influences plaque bacteria. severe acidification kills bacteria efficiently, while physiological acidification, the condition occurring in plaque, kills bacteria partially and may impair growth ability. we, therefore, ... | 2009 | 19572895 |
| molecular characterization of macrolide resistance determinants [erm(b) and mef(a)] in streptococcus pneumoniae and viridans group streptococci (vgs) isolated from adult patients with cystic fibrosis (cf). | although long-term use of azithromycin has shown a significant clinical improvement for patients with cystic fibrosis (cf), its long-term effect on the susceptibility of commensal flora within cf airways has not yet been examined. we therefore suggest that long-term use of azithromycin increases macrolide resistance in commensal streptococci. | 2009 | 19584106 |
| oral bacterial adhesion forces to biomaterial surfaces constituting the bracket-adhesive-enamel junction in orthodontic treatment. | bacterial adhesion to biomaterial surfaces constituting the bracket-adhesive-enamel junction represents a growing problem in orthodontics, because bacteria can adversely affect treatment by causing demineralization of the enamel surface around the brackets. it is important to know the forces with which bacteria adhere to the surfaces of these junction materials, as the strength of these forces will determine how easy it will be to remove the bacteria. we compared the adhesion forces of five init ... | 2009 | 19627354 |
| identification of the binding domain of streptococcus oralis glyceraldehyde-3-phosphate dehydrogenase for porphyromonas gingivalis major fimbriae. | porphyromonas gingivalis forms communities with antecedent oral biofilm constituent streptococci. p. gingivalis major fimbriae bind to glyceraldehyde-3-phosphate dehydrogenase (gapdh) present on the streptococcal surface, and this interaction plays an important role in p. gingivalis colonization. this study identified the binding domain of streptococcus oralis gapdh for p. gingivalis fimbriae. s. oralis recombinant gapdh (rgapdh) was digested with lysyl endopeptidase. cleaved fragments of rgapdh ... | 2009 | 19737900 |
| mutualistic biofilm communities develop with porphyromonas gingivalis and initial, early, and late colonizers of enamel. | porphyromonas gingivalis is present in dental plaque as early as 4 h after tooth cleaning, but it is also associated with periodontal disease, a late-developing event in the microbial successions that characterize daily plaque development. we report here that p. gingivalis atcc 33277 is remarkable in its ability to interact with a variety of initial, early, middle, and late colonizers growing solely on saliva. integration of p. gingivalis into multispecies communities was investigated by using t ... | 2009 | 19749049 |
| impact of hydrodynamics on oral biofilm strength. | mechanical removal of oral biofilms is ubiquitously accepted as the best way to prevent caries and periodontal diseases. removal effectiveness strongly depends on biofilm strength. to investigate the influence of hydrodynamics on oral biofilm strength, we grew single- and multi-species biofilms of streptococcus oralis j22, actinomyces naeslundii tv14-j1, and full dental plaque at shear rates ranging from 0.1 to 50 1/sec and measured their compressive strength. subsequently, biofilm architecture ... | 2009 | 19783800 |
| cytoplasmic antineutrophil cytoplasmic antibody positive pauci-immune glomerulonephritis associated with infectious endocarditis. | renal deterioration often occurs in cases of infectious endocarditis (ie), but, ie- associated nephritis with rapidly progressive glomerulonephritis (rpgn) is rare. patients with severe infection (e.g., ie) sometimes show positivity for cytoplasmic antineutrophil cytoplasmic antibodies (c-anca). therefore, diagnosis and treatment are very difficult in cases of rpgn with ie and positivity for c-anca. such cases are rare, only 12 have been reported in the english literature. herein, we describe th ... | 2006 | 17176917 |
| [unknown fever in a patient with implanted intracardiac lead]. | | 2007 | 17354585 |
| central role of the early colonizer veillonella sp. in establishing multispecies biofilm communities with initial, middle, and late colonizers of enamel. | human dental biofilm communities comprise several species, which can interact cooperatively or competitively. bacterial interactions influence biofilm formation, metabolic changes, and physiological function of the community. lactic acid, a common metabolite of oral bacteria, was measured in the flow cell effluent of one-, two- and three-species communities growing on saliva as the sole nutritional source. we investigated single-species and multispecies colonization by using known initial, early ... | 2010 | 20154130 |
| rpoa is a useful gene for identification and classification of streptococcus pneumoniae from the closely related viridans group streptococci. | streptococcus pneumoniae, the leading etiological agent of pneumonia, shares a high degree of dna sequence homology with the viridans group of streptococci. the clinical and pathological manifestations may present with different features, and discrimination between s. pneumoniae and its close viridans cocci relatives, such as streptococcus mitis and streptococcus oralis, is still quite difficult. the 445-bp sequences of the n-terminal region of rpoa from nine s. pneumoniae, seven s. mitis, ten s ... | 2010 | 20158524 |
| [dissertations 25 years after date 21. enhancing resistance to bacteria with chlorhexidine varnish and probiotics]. | the aim of the research described in 'chemotherapy against streptococcus mutans' was to increase colonization resistance against mutans streptococci by inoculating actinomyces naeslundii on the dentition. actinomyces naeslundii established better after chlorhexidine application than after dental cleansing only but did not exceed the 1% level of the total actinomyces population. this was insufficient to increase the colonization resistance against mutans streptococci. a 33% chlorhexidine varnish ... | 2010 | 20225702 |
| exopolysaccharides produced by streptococcus mutans glucosyltransferases modulate the establishment of microcolonies within multispecies biofilms. | streptococcus mutans is a key contributor to the formation of the extracellular polysaccharide (eps) matrix in dental biofilms. the exopolysaccharides, which are mostly glucans synthesized by streptococcal glucosyltransferases (gtfs), provide binding sites that promote accumulation of microorganisms on the tooth surface and further establishment of pathogenic biofilms. this study explored (i) the role of s. mutans gtfs in the development of the eps matrix and microcolonies in biofilms, (ii) the ... | 2010 | 20233920 |
| bacteria trigger oxygen radical release and sperm lipid peroxidation in in vitro model of semen inflammation. | to assess the in vitro effect of five bacterial strains isolated from semen samples (escherichia coli, staphylococcus haemolyticus, streptococcus oralis, bacteroides ureolyticus, and ureaplasma urealyticum) on reactive oxygen intermediate (roi) release and lipid sperm membrane peroxidation in the coincubated suspensions of white blood cells (wbc) with spermatozoa. | 2007 | 17383646 |
| oral streptococcal strains isolated from odontogenic infections and their susceptibility to antibiotics. | the aim of this study was to identify at species level and to investigate the antibiotic susceptibility of oral streptococcal strains isolated from 100 pus samples collected from romanian patients with different odontogenic infections. the isolates were identified at species level using the rapid id 32 strep system and their susceptibility was testing by the etest, against: penicillin g, ampicillin, erythromycin, clindamycin and tetracycline. for the investigation of erythromycin resistance phen ... | 2006 | 17438917 |
| biofilm formation and virulence expression by streptococcus mutans are altered when grown in dual-species model. | microbial cell-cell interactions in the oral flora are believed to play an integral role in the development of dental plaque and ultimately, its pathogenicity. the effects of other species of oral bacteria on biofilm formation and virulence gene expression by streptococcus mutans, the primary etiologic agent of dental caries, were evaluated using a dual-species biofilm model and realtime-pcr analysis. | 2010 | 20398271 |
| energy transfer, volumetric expansion, and removal of oral biofilms by non-contact brushing. | non-contact removal of oral biofilms offers advantages beyond the reach of bristles, but it is unknown how energy transfer for removal from brush-to-biofilm occurs. in the present study we evaluated non-contact, oral biofilm removal by oscillating-rotating and sonic toothbrushes, and their acoustic output up to 6 mm distance. whereas some brushes removed biofilm when used at a distance of up to 6 mm, others lost efficacy at a distance of 2-4 mm from the biofilm. loss of efficacy was accompanied ... | 2010 | 20487007 |
| mechanical non-surgical treatment of peri-implantitis: a single-blinded randomized longitudinal clinical study. ii. microbiological results. | peri-implantitis is common in patients with dental implants. we performed a single-blinded longitudinal randomized study to assess the effects of mechanical debridement on the peri-implant microbiota in peri-implantitis lesions. | 2010 | 20507380 |
| structure and molecular characterization of streptococcus pneumoniae capsular polysaccharide 10f by carbohydrate engineering in streptococcus oralis. | although closely related at the molecular level, the capsular polysaccharide (cps) of serotype 10f streptococcus pneumoniae and coaggregation receptor polysaccharide (rps) of streptococcus oralis c104 have distinct ecological roles. cps prevents phagocytosis of pathogenic s. pneumoniae, whereas rps of commensal s. oralis functions as a receptor for lectin-like adhesins on other members of the dental plaque biofilm community. results from high resolution nmr identified the recognition region of s ... | 2010 | 20507989 |
| bacterial meningitis following upper gastrointestinal endoscopy in patients with cirrhosis - bear it in mind. | | 2007 | 17440865 |
| identification of the cpsa gene as a specific marker for the discrimination of streptococcus pneumoniae from viridans group streptococci. | streptococcus pneumoniae, the aetiological agent of pneumonia and non-gonococcal urethritis, shares a high degree of dna sequence identity with the viridans group of streptococci, particularly streptococcus mitis and streptococcus oralis. although their clinical and pathological manifestations are different, discrimination between s. pneumoniae and its close viridans cocci relatives is still quite difficult. suppression subtractive hybridization was performed to identify the genomic differences ... | 2010 | 20616191 |
| real-time pcr assays for the detection and quantification of streptococcus pneumoniae. | streptococcus pneumoniae is the main etiologic agent of pneumonia worldwide. because the members of the viridans group streptococci share a high degree of dna sequence homologies, phenotypic and genotypic discriminations of s. pneumoniae from the viridans group are difficult. a quantitative real-time pcr assay targeting the capsular polysaccharide biosynthesis gene (cpsa) was developed as a species-specific detection tool for s. pneumoniae. the specificity was evaluated using genomic dnas extrac ... | 2010 | 20633048 |
| aortic endograft infection: open surgical management with endograft preservation. | we report successful management of aortic endograft infection without graft explantation or extra-anatomic bypass. | 2007 | 17478113 |
| the rgg gene is a specific marker for streptococcus oralis. | although the pathogenesis of streptococcus oralis may be different from that of other viridans group streptococci, s. oralis shares a high degree of dna sequence similarity with these streptococci. as a result, discrimination of s. oralis from its close relatives has long been considered difficult. this study was conducted to find specific genes that allow for the in vitro identification of s. oralis, but not other oral commensals. four hundred ninety s. oralis clones obtained by suppressive sub ... | 2010 | 20739692 |
| involvement of minor components associated with the fima fimbriae of porphyromonas gingivalis in adhesive functions. | the fima fimbriae of porphyromonas gingivalis, the causative agent of periodontitis, have been implicated in various aspects of pathogenicity, such as colonization, adhesion and aggregation. in this study, the four open reading frames (orf1, orf2, orf3 and orf4) downstream of the fimbrilin gene (fima) in strain atcc 33277 were examined. orf2, orf3 and orf4 were demonstrated to encode minor components of the fimbriae and were therefore renamed fimc, fimd and fime, respectively. immunoblotting ana ... | 2007 | 17526848 |
| investigation of supragingival plaque microbiota in different caries status of chinese preschool children by denaturing gradient gel electrophoresis. | this study aimed to detect differences in the richness of total supragingival plaque microbiota as well as the species composition of oral streptococci involved in the different stages of dental caries. forty-five plaque samples were collected from caries-moderate (cm, 4 ≤ dmfs ≤ 6), caries-susceptible (cs, dmfs ≥ 10), and age-matched caries-free children separately. total dna was isolated directly from each sample, and polymerase chain reaction-denaturing gradient gel electrophoresis (pcr-dgge) ... | 2010 | 20927511 |
| effect of biofilm on the repair bond strengths of composites. | composite restorations degrade during wear, but it is unknown how wear affects the composite surface and influences composite-to-composite bonding in minimally invasive repair. here, it is hypothesized that in vitro exposure of composites to oral biofilm yields clinically relevant degradation of composite surfaces, and its influence on composite-to-composite bonding is determined. biofilms on composite surfaces in vitro increased their roughness and decreased filler particle exposure, except for ... | 2010 | 20940354 |
| fluoroquinolone resistance in atypical pneumococci and oral streptococci: evidence of horizontal gene transfer of fluoroquinolone resistance determinants from streptococcus pneumoniae. | atypical strains, presumed to be pneumococcus, with ciprofloxacin mics of > or =4.0 microg/ml and unique sequence variations within the quinolone resistance-determining regions (qrdrs) of the gyrase and topoisomerase genes in comparison with the streptococcus pneumoniae r6 strain, were examined. these strains were reidentified using phenotypic methods, including detection of optochin susceptibility, bile solubility, and agglutination by serotype-specific antisera, and genotypic methods, includin ... | 2007 | 17548487 |
| endocarditis-associated oral streptococci promote rapid differentiation of monocytes into mature dendritic cells. | endocarditis is frequently attributable to oral streptococci, but mechanisms of pathogenesis are not well understood, although monocytes appear to be important. high titers of interleukin-12 (il-12) are produced by peripheral blood mononuclear cells (pbmc) after engaging streptococcus mutans, but monocytes in developing endocardial vegetations tend to disappear rather than become macrophages. these data prompted the hypothesis that streptococcus-infected monocytes differentiate into short-lived ... | 2005 | 16041016 |
| [classical and new approaches in laboratory diagnosis of viridans streptococci.] | viridans group streptococci (vgs) are gram-positive microorganisms that can form alpha-hemolytic colonies on sheep blood agar. they reside as normal flora in oral cavity, respiratory, gastrointestinal, urogenital tract and on skin. they can cause bacteremia, endocarditis, meningitis and septicemia following dental procedures. the diagnosis of vgs are difficult since the taxonomic classification and species na-mes may change due in time. viridans group streptococci are classified into 5 groups (s ... | 2010 | 21064001 |
| streptococcus oralis as a risk factor for middle cerebral artery thrombosis. | we reported a case of an 8-year-old boy who was presented to the emergency department with left-sided hemiparesis. computed tomography showed hypodense areas in the territory of the right middle cerebral artery, indicating acute cerebral infarct. diagnostic evaluation was performed to identify the etiology. on the eighteenth day of hospitalization, cerebrospinal fluid cultures yielded streptococcus oralis. we hypothesized that the source of the oral pathogen was an abscess belonging to his upper ... | 2005 | 16159530 |
| proteases of an early colonizer can hinder streptococcus mutans colonization in vitro. | streptococcus mutans is the primary cariogen that produces several virulence factors that are modulated by a competence-stimulating peptide (csp) signaling system. in this study, we sought to determine if proteases produced by early dental plaque colonizers such as streptococcus gordonii interfere with the subsequent colonization of s. mutans bm71 on the existing streptococcal biofilms. we demonstrated that s. mutans bm71 colonized much less efficiently in vitro on streptococcal biofilms than on ... | 2010 | 21088146 |
| experimental infective endocarditis induced by human supragingival dental plaque in rats. | human dental plaque is thought to contribute to disease, not only in the oral cavity but also at other body sites. to investigate the pathogenicity of dental plaque in tissues remote from the mouth, we examined the ability of human supragingival dental plaque to induce infective endocarditis (ie) in rats. in total, 15 out of 27 catheterized rats survived after intravenous injections with human supragingival dental plaque suspensions containing 3 x 10(6) colony-forming units (cfu) of bacterial ce ... | 2005 | 16324140 |
| [purification of mutacin]. | to purify mutacin produced from isolated streptococcus mutans (s. mutans) strains in order to, contribute to molecular biological research of mutacin. | 2010 | 21179700 |
| molecular characterization and phylogenetic analysis of quinolone resistance-determining regions (qrdrs) of gyra, gyrb, parc and pare gene loci in viridans group streptococci isolated from adult patients with cystic fibrosis. | ciprofloxacin is the most frequently used member of the fluoroquinolones during initial eradication therapy of pseudomonas aeruginosa, as well as during acute pulmonary exacerbations. however, its long-term effect on the susceptibility of the commensal flora within the cystic fibrosis (cf) airways has not yet been examined. the aim of this study was therefore to examine the consequence of oral ciprofloxacin usage on the resistance of the commensal viridans group streptococci (vgs), in terms of m ... | 2010 | 21193474 |
| efficacy of natural antimicrobials in toothpaste formulations against oral biofilms in vitro. | to evaluate the antimicrobial efficacies of two toothpaste formulations containing natural antimicrobials (herbal extracts and chitosan) against oral biofilms of different composition and maturational status. | 2010 | 21195122 |
| subacute and acute infective endocarditis. | | 2005 | 16325699 |
| an antimicrobial effect from silver-coated toothbrush heads. | to examine the antimicrobial effect of silver-coated toothbrush heads in vitro. | 2010 | 21207790 |
| invasion of human aortic endothelial cells by oral viridans group streptococci and induction of inflammatory cytokine production. | oral viridans group streptococci are the major commensal bacteria of the supragingival oral biofilm and have been detected in human atheromatous plaque. atherosclerosis involves an ongoing inflammatory response, reportedly involving chronic infection caused by multiple pathogens. the aim of this study was to examine the invasion of human aortic endothelial cells (haecs) by oral viridans group streptococci and the subsequent cytokine production by viable invaded haecs. the invasion of haecs by ba ... | 2010 | 21214874 |
| effect of 2-hydroxyethyl methacrylate on streptococcus spp. biofilms. | the effect of different concentrations of 2-hydroxyethyl methacrylate (hema) was evaluated on biofilm formation and preformed biofilm of streptococcus mitis, streptococcus mutans and streptococcus oralis, alone or combined to each other. | 2011 | 21219369 |
| antimicrobial and anti-adhesive potential of a biosurfactant rufisan produced by candida lipolytica ucp 0988. | in the last years, researches developed with biosurfactants for application in the medical area have been revealing the promising biological activities of these biomolecules. in this work the antimicrobial and anti-adhesive properties of a biosurfactant rufisan isolated from the yeast candida lipolytica ucp 0988, growth in a medium supplemented with ground nut refinery residue was determined against several microorganisms. the biosurfactant was able to reduce the water surface tension from 70 to ... | 2010 | 21247740 |
| structure, viability and bacterial kinetics of an in vitro biofilm model using six bacteria from the subgingival microbiota. | there are few in vitro models available in the scientific literature for study of the structure, formation and development of the subgingival biofilm. the purpose of this study was to develop and validate an in vitro biofilm model, using representative selected bacteria from the subgingival microbiota. | 2011 | 21261622 |
| an in vitro comparative study determining bactericidal activity of stabilized chlorine dioxide and other oral rinses. | the study was conducted to determine the bactericidal activity of a stabilized chlorine dioxide oral rinse (closys oral rinse) compared to products currently available on the market. | 2011 | 21290979 |
| spontaneous pyogenic spinal epidural abscess. | spontaneous pyogenic spinal epidural abscess (sea) is a rare condition but might be devastating and fatal. traditional treatment is surgical decompression and antibiotics. a retrospective study was designed to assess the eff ect of clinical findings and treatment methods on the outcome. material and | 2011 | 21294095 |
| evaluation antimicrobial and antiadhesive properties of the biosurfactant lunasan produced by candida sphaerica ucp 0995. | different groups of biosurfactants exhibit diverse properties and display a variety of physiological functions in producer microorganisms; these include enhancing the solubility of hydrophobic/water-insoluble compound, heave metal binding, bacterial pathogenesis, cell adhesion and aggregation, quorum sensing and biofilm formation. candida sphaerica was grown in a low cost medium, consisting of distilled water supplemented with 9% refinery residue of soybean oil and 9% corn steep liquor, for 144 ... | 2011 | 21327556 |
| clustering of subgingival microbial species in adolescents with periodontitis. | it has become increasingly recognized that groups of microorganisms interact within the subgingival plaque of adult subjects with periodontitis. it is much less clear, however, whether the consortia of microorganisms associated with periodontitis are different in early and more advanced cases of periodontitis. to investigate this point further, subgingival plaque was collected from six sites in 87 adolescents with periodontitis and 73 controls and the samples were analyzed for the detection of 1 ... | 2011 | 21410554 |
| novel model for multispecies biofilms that uses rigid gas-permeable lenses. | oral biofilms comprise complex multispecies consortia aided by specific inter- and intraspecies interactions occurring among commensals and pathogenic bacterial species. oral biofilms are primary initiating factors of periodontal disease, although complex multifactorial biological influences, including host cell responses, contribute to the individual outcome of the disease. to provide a system to study initial stages of interaction between oral biofilms and the host cells that contribute to the ... | 2011 | 21421785 |
| identification of new acceptor specificities of glycosyltransferase r with the aid of substrate microarrays. | finding opportunities to construct sugar motifs and to transfer them to targets of biological relevance and rapid identification of glycosylation events are important goals for glycobiology and a field of increasing interest. here we have applied an enzyme microarray screening system for the identification of new acceptor specificities of the glycosyltransferase r (gtfr) from streptococcus oralis (e.c. 2.4.1.5), which was able to effect the synthesis of sugar motifs in short times and with low a ... | 2006 | 16416490 |
| multispecies communities: interspecies interactions influence growth on saliva as sole nutritional source. | human oral bacteria live in multispecies communities in the biofilm called dental plaque. this review focuses on the interactions of seven species and the ability of each species individually and together with other species to grow on saliva as the sole source of nutrient. community formation in biofilms in flow cells is monitored using species-specific fluorophore-conjugated immunoglobulin g, and images are captured by confocal microscopy. early colonizing veillonellae emerge from this review o ... | 2011 | 21485308 |
| influences of trans-trans farnesol, a membrane-targeting sesquiterpenoid, on streptococcus mutans physiology and survival within mixed-species oral biofilms. | trans-trans farnesol (tt-farnesol) is a bioactive sesquiterpene alcohol commonly found in propolis (a beehive product) and citrus fruits, which disrupts the ability of streptococcus mutans (s. mutans) to form virulent biofilms. in this study, we investigated whether tt-farnesol affects cell-membrane function, acid production and/or acid tolerance by planktonic cells and biofilms of s. mutans ua159. furthermore, the influence of the agent on s. mutans gene expression and ability to form biofilms ... | 2011 | 21485314 |
| phylogenetic analyses and detection of viridans streptococci based on sequences and denaturing gradient gel electrophoresis of the rod shape-determining protein gene. | population analysis of viridans streptococci is important because these species are associated with dental caries, bacteremia, and subacute endocarditis, in addition to being important members of the human oral commensal microbiota. | 2009 | 21523207 |
| [a case report of streptococcus oralis meningitis after dental manipulation]. | a 75-year-old man was admitted to our hospital because of high fever and disturbance of consciousness 4 days after dental treatment including scaling, irrigation, and oral antibiotic for dental caries without gingivitis. a lumber puncture revealed cloudy cerebrospinal fluid (csf): it contained 984 leukocytes/mm3, 680 mg/dl of protein, 5 mg/dl of glucose (blood sugar 233 mg/dl), and streptococcus oralis, one of common microorganisms on the gingival, was isolated from the csf. he was successfully ... | 2006 | 16619842 |
| antimicrobial penetration and efficacy in an in-vitro oral biofilm model. | the penetration and overall efficacy of six mouthrinse actives was evaluated using an in vitro flow cell oral biofilm model. the technique involved pre-loading biofilm cells with a green fluorescent dye that leaked out as the cells were permeabilized by a treatment. the loss of green color, and of biomass, was observed by time-lapse microscopy during 60 min of treatment under continuous flow conditions. the six actives analyzed were ethanol, sodium lauryl sulfate (sls), triclosan (trn), chlorhex ... | 2011 | 21537022 |
| molecular bacterial diversity and bioburden of commercial airliner cabin air. | culture-independent, biomarker-targeted bacterial enumeration and identification strategies were employed to estimate total bacterial burden and diversity within the cabin air of commercial airliners. samples from each of 4 flights on 2 commercial carriers were collected via air-impingement. the total viable microbial population ranged from below detection limits to 4.1 x 10(6) cells/m(3) of air, as assessed by the atp assay. a gradual accumulation of microbes was observed from the time of passe ... | 2007 | 18026220 |
| distribution of oral streptococci highly resistant to amoxicillin in dental plaque specimens from japanese children and adolescents. | oral streptococci are major pathogens of infective endocarditis (ie). prophylactic antibiotics are commonly given to subjects with certain kinds of heart disorders when invasive dental treatments are performed, with amoxicillin (ampc) widely used for this purpose. however, there is scant information regarding ampc-resistant oral streptococci. a total of 344 dental plaque specimens collected from 253 healthy japanese children, adolescents, and young adults (aged 2-22 years) were diluted and strea ... | 2011 | 21799198 |
| lactobacillus fermentum aca-dc 179 displays probiotic potential in vitro and protects against trinitrobenzene sulfonic acid (tnbs)-induced colitis and salmonella infection in murine models. | lactobacillus fermentum aca-dc 179, lactobacillus plantarum aca-dc 287 and streptococcus macedonicus aca-dc 198 were studied for their probiotic potential. firstly, strains were screened for antimicrobial activity towards a broad range of target strains, including lactic acid bacteria, food spoilage and pathogenic bacteria. l. fermentum aca-dc 179 was active against five streptococci, including the two pathogenic strains streptococcus oralis lmg 14532t and streptococcus pneumoniae lmg 14545t. s. ... | 2008 | 18077037 |
| in vitro destruction of streptococcus pneumoniae biofilms with bacterial and phage peptidoglycan hydrolases. | host- and phage-coded cell wall hydrolases have been used to fight streptococcus pneumoniae growing as planktonic cells in vitro as well as in animal models. until now, however, the usefulness of these enzymes in biofilm-grown pneumococci has gone untested. the anti-pneumococcal activity of different cell wall hydrolases produced by s. pneumoniae and a number of its phages was examined in an in vitro biofilm model. the major pneumococcal autolysin lyta, an n-acetylmuramoyl-l-alanine amidase, sho ... | 2011 | 21746941 |
| bacterial interference of penicillin-sensitive and -resistant streptococcus pneumoniae by streptococcus oralis in an adenoid organ culture: implications for the treatment of recurrent upper respiratory tract infections in children and adults. | the role of the viridans group of streptococci (streptococcus oralis) in the prevention of colonization with streptococcus pneumoniae was investigated in an adenoid organ culture system. | 2006 | 16739666 |
| antimicrobial efficacy of denture adhesives on some oral malodor-related microbes. | the objective of the study was to determine the antimicrobial efficacy of three denture adhesives toward streptococcus oralis, mutans, prevotella oralis and fusobacterium nucleatum. adhesives used were corega ultra(®), fixodent pro original(®) and biotene(®) denture grip. for streptococcus oralis and streptococcus mutans, four tubes of trypticase soy broth 10 ml and 1 g denture of adhesive were used. in addition four tubes of trypticase soy broth 10 ml without any denture adhesive was employed a ... | 2011 | 22075753 |
| population diversity and dynamics of streptococcus mitis, streptococcus oralis, and streptococcus infantis in the upper respiratory tracts of adults, determined by a nonculture strategy. | we reinvestigated the clonal diversity and dynamics of streptococcus mitis and two other abundant members of the commensal microbiota of the upper respiratory tract, streptococcus oralis and streptococcus infantis, to obtain information about the origin of frequently emerging clones in this habitat. a culture-independent method was used, based on cloning and sequencing of pcr amplicons of the housekeeping gene gdh, which shows remarkable, yet species-specific, genetic polymorphism. samples were ... | 2008 | 18316382 |
| a predatory mechanism dramatically increases the efficiency of lateral gene transfer in streptococcus pneumoniae and related commensal species. | bacteria that are competent for natural genetic transformation, such as pneumococci and their commensal relatives streptococcus mitis and streptococcus oralis, take up exogenous dna and incorporate it into their genomes by homologous recombination. traditionally, it has been assumed that genetic material leaking from dead bacteria constitutes the sole source of external dna for competent streptococci. here we describe a mechanism for active acquisition of homologous dna that dramatically increas ... | 2008 | 18485065 |
| thermal treatments modulate bacterial adhesion to dental enamel. | numerous studies have demonstrated the effects of laser-induced heat on demineralization of enamel; however, no studies have investigated the link between heat/laser-induced changes in physicochemical properties and bacterial adhesion. in this study, we investigated the effects of thermal treatment on surface properties of enamel such as hydrophobicity and zeta potential. bacterial adhesion to treated surfaces was characterized by confocal laser scanning microscopy, and adhesion force was quanti ... | 2011 | 21960683 |
| evolution of streptococcus pneumoniae and its close commensal relatives. | streptococcus pneumoniae is a member of the mitis group of streptococci which, according to 16s rrna-sequence based phylogenetic reconstruction, includes 12 species. while other species of this group are considered prototypes of commensal bacteria, s. pneumoniae is among the most frequent microbial killers worldwide. population genetic analysis of 118 strains, supported by demonstration of a distinct cell wall carbohydrate structure and competence pheromone sequence signature, shows that s. pneu ... | 2008 | 18628950 |
| identification of interspecies interactions affecting porphyromonas gingivalis virulence phenotypes. | periodontitis is recognized as a complex polymicrobial disease, however, the impact of the bacterial interactions among the 700-1,000 different species of the oral microbiota remains poorly understood. we conducted an in vitro screen for oral bacteria that mitigate selected virulence phenotypes of the important periodontal pathogen, porphyromonas gingivalis. | 2011 | 22022641 |
| triple-valve treatment for prosthetic valve endocarditis occurring 20 years after implantation of a carpentier-edwards pericardial bioprosthesis in the aortic valve. | a 68-year-old woman had undergone aortic valve replacement and open commissurotomy 20 years previously. at the beginning of 2008, fever, cold, and heart failure symptoms were noted. on blood culture, streptococcus oralis was detected three times. surgery was performed under a diagnoses of prosthetic valve endocarditis in the aortic valve, mitral stenosis and insufficiency, and tricuspid insufficiency. techniques consisted of additional aortic valve replacement, mitral valve replacement, and tric ... | 2008 | 19085053 |
| effect of saliva viscosity on the co-aggregation between oral streptococci and actinomyces naeslundii. | gerodontology 2011; doi: 10.1111/j.1741-2358.2011.00595.x effect of saliva viscosity on the co-aggregation between oral streptococci and actinomyces naeslundii background: the co-aggregation of oral bacteria leads to their clearance from the oral cavity. poor oral hygiene and high saliva viscosity are common amongst the elderly; thus, they frequently suffer from pneumonia caused by the aspiration of oral microorganisms. objectives: to examine the direct effect of saliva viscosity on the co-agg ... | 2011 | 22077758 |
| clonal structure of streptococcus sanguinis strains isolated from endocarditis cases and the oral cavity. | a collection of streptococcus sanguinis strains from patients with endocarditis (n = 21) and from the oral cavity (n = 34) was subjected to a multi-locus sequence typing analysis using seven housekeeping genes, carbamoyl-phosphate synthetase (carb), co/zn/cd efflux system component (czcd), d-alanyl-d-alanine ligase (ddl), dna polymerase iii (dnax), glucose-6-phosphate dehydrogenase (gdh), dna-directed rna polymerase, beta subunit (rpob) and superoxide dismutase (soda). the scheme was expanded by ... | 2011 | 21896156 |
| safety assessment of probiora3, a probiotic mouthwash: subchronic toxicity study in rats. | streptococcus viridans are commensal bacteria that constitute a significant portion of the resident oral microflora. the objective of the present study is to investigate adverse effects, if any, of a blend of 3 natural strains, streptococcus uberis kj2, streptococcus oralis kj3, and streptococcus rattus jh145 (probiotic mouthwash, probiora(3)). the blend is administered to rats orally once daily (5 days per week) at doses of 0, 10(6), or 10(9) colony-forming units of each strain for 14 weeks. no ... | 2009 | 19815843 |
| a rare case of infective endocarditis complicated by trichosporon asahii fungemia treated by surgery. | the patient was a 58-year-old male. he consulted our hospital because of weight loss and fever. computed tomography (ct) revealed renal infarction. nine days after admission, ct showed hemorrhagic cerebral infarction in the right frontal lobe. a blood culture revealed streptococcus oralis, and echocardiography revealed vegetation in the mitral and aortic valves, suggesting infective endocarditis (ie). fever (39 degrees c or higher) was noted 23 days after admission. a blood culture revealed tric ... | 2009 | 19901894 |
| profiling of subgingival plaque biofilm microflora from periodontally healthy subjects and from subjects with periodontitis using quantitative real-time pcr. | qualitative and quantitative changes of the subgingival plaque biofilm microflora in periodontal pockets are thought to be associated with the development and progression of periodontitis. the aims of the present study were to quantify the proportions of nine periodontitis-associated bacterial species and four streptococcus species in subgingival plaque, and to evaluate their relationship with periodontitis quantitatively. | 2010 | 20337892 |
| antibiotic modulation of the plasminogen binding ability of viridans group streptococci. | the ability of viridans group streptococci to bind human plasminogen and its subsequent activation into plasmin may contribute to the pathogenesis of infective endocarditis (ie) by leading to a decreased stability of the streptococcal vegetation and facilitating dehiscence of emboli. at levels greater than or equal to their mics, penicillin, vancomycin, and linezolid are efficacious in the treatment of streptococcal endocarditis. however, at sub-mics, antibiotics can modulate the expression of b ... | 2012 | 22037854 |
| pH landscapes in a novel five-species model of early dental biofilm. | Despite continued preventive efforts, dental caries remains the most common disease of man. Organic acids produced by microorganisms in dental plaque play a crucial role for the development of carious lesions. During early stages of the pathogenetic process, repeated pH drops induce changes in microbial composition and favour the establishment of an increasingly acidogenic and aciduric microflora. The complex structure of dental biofilms, allowing for a multitude of different ecological environm ... | 2011 | 21966490 |
| in vitro antimicrobial activity of root canal sealers and calcium hydroxide paste. | to evaluate the in vitro antimicrobial activity of different root canal sealers and calcium hydroxide (ch) paste. | 2010 | 22114408 |
| endophthalmitis associated with retinal laser treatment in a trabeculectomized eye. | | 2010 | 20379313 |
| mitis group streptococci express variable pilus islet 2 pili. | streptococcus oralis, streptococcus mitis, and streptococcus sanguinis are members of the mitis group of streptococci and agents of oral biofilm, dental plaque and infective endocarditis, disease processes that involve bacteria-bacteria and bacteria-host interactions. their close relative, the human pathogen s. pneumoniae uses pilus-islet 2 (pi-2)-encoded pili to facilitate adhesion to eukaryotic cells. | 2011 | 21966432 |
| Synergistic Interaction between Candida albicans and Commensal Oral Streptococci in a Novel In Vitro Mucosal Model. | Candida albicans is a commensal colonizer of the gastrointestinal tract of humans, where it coexists with highly diverse bacterial communities. It is not clear if this interaction limits or promotes the potential of C. albicans to become an opportunistic pathogen. Here we investigate the interaction between C. albicans and three species of streptococci from the viridans group, which are ubiquitous and abundant oral commensal bacteria. The ability of C. albicans to form biofilms with Streptococcu ... | 2011 | 22104105 |
| in vitro interaction of chronic wound bacteria in biofilms. | to use in vitro biofilm models of wound bacterial isolates and compare the biofilms produced for different combinations of wound bacterial species. | 2011 | 22240883 |
| oral microbial biofilm stimulation of epithelial cell responses. | oral bacterial biofilms trigger chronic inflammatory responses in the host that can result in the tissue destructive events of periodontitis. however, the characteristics of the capacity of specific host cell types to respond to these biofilms remain ill-defined. this report describes the use of a novel model of bacterial biofilms to stimulate oral epithelial cells and profile select cytokines and chemokines that contribute to the local inflammatory environment in the periodontium. monoinfection ... | 2012 | 22266273 |
| uv-c-irradiation sublethal stress does not alter antibiotic susceptibility of the viridans group streptococci to β-lactam, macrolide, and fluoroquinolone antibiotic agents. | previous work has indicated that environmental stresses on bacteria might lead to an upregulation of stress response. led curing lights (315-400 nm) and other uv lights used in tooth whitening cosmetic procedures might act as stresses. we examined the effect of uv-c light, as a high-energy surrogate to the lower-energy uv-a light used in such instruments, to examine its effect on the antibiotic susceptibility of viridans group streptococci. | 2011 | 22887906 |
| influence of orthodontic treatment on oral streptococci. | objective of this study is to evaluate the changes of the oral microbial flora, concentrating on the oral streptococci, after the first 3 and 6 months of orthodontic treatment. | 2011 | 22570923 |
| in vitro antimicrobial activity of mouth washes and herbal products against dental biofilm-forming bacteria. | to evaluate in vitro, the antimicrobial effect of cymbopogon citrates (lemon grass), plectranthusamboinicus (mexican mint) and conyzabonariensis (hairy fleabane) tinctures as well as pure and diluted commercial mouth washes (malvatricin(®), periogard(®) and listerine(®)) on wild isolates of streptococcusmutans and reference strains of s. mutans, streptococcus salivarius, streptococcus oralis and lactobacillus casei by determination of minimum inhibitory dilution (mid). | 2012 | 23293486 |
| [hip prosthetic streptococcus oralis infection]. | | 2010 | 20554139 |
| antibacterial activity of various self-etching adhesive systems against oral streptococci. | the antibacterial properties of self-etching adhesive systems constitute an important issue in operative dentistry, since viable bacteria can still be present after cavity preparation. the current study evaluated the antibacterial activity of five one-step self-etching adhesives (seas) and four self-etching primers (seps) against oral streptococci. clearfil s3 (s3), one-up bond f plus (ou), futurabond nr (fb), gbond (gb), xeno iv (x4), clearfil se bond (se), clearfil protect bond (pb), adper se ... | 2010 | 20672730 |
| genome sequence of the temperate bacteriophage ph10 from streptococcus oralis. | exponential growing cultures of streptococcus oralis strain omz 1038, isolated from human supragingival dental plaque, were found to release a bacteriophage (designated ph10) upon treatment with mitomycin c. the complete genome sequence of phage ph10 was determined. the genome was 31276 bp in size and contained 54 open reading frames. the module encoding structural proteins was highly similar to that of streptococcus pneumoniae prophage phispn_3. the most abundant phage structural protein was en ... | 2010 | 20803062 |
| new species genetic approach to identify strains of mitis group streptococci that are donors of rifampin resistance to streptococcus pneumoniae. | eight rifampin-resistant streptococci of the mitis group were identified at the species level by using a concatenated 16s rrna gene-soda-rpob-hlpa sequence. characterization of their rpob alleles showed single amino acid changes involved in rifampin resistance. comparison of rpob sequences from pneumococcal recombinant isolates, viridans isolates, and type strains revealed a species-specific amino acid signature, which allowed it to be ascertained that recombinant rpobs were originated in geneti ... | 2010 | 21041504 |
| visualization by 256-slice computed tomography of mycotic aortic root aneurysms in infective endocarditis. | infective endocarditis (ie) may lead to mycotic aortic root aneurysm formation. herein is described the preoperative use of ecg-gated contrast-enhanced 256-slice cardiac computed tomography (ct) to optimize surgical planning by visualizing the location and extent of the mycotic aneurysm in two patients with complicated ie. in both cases, ct revealed a large aortic root mycotic aneurysm, accurately determined its location and extent, and also depicted the close relationship of the aneurysm to the ... | 2010 | 21053742 |
| contribution of plasminogen activation towards the pathogenic potential of oral streptococci. | oral streptococci are a heterogeneous group of human commensals, with a potential to cause serious infections. activation of plasminogen has been shown to increase the virulence of typical human pathogenic streptococci such as s. pneumoniae. one important factor for plasminogen activation is the streptococcal α-enolase. here we report that plasminogen activation is also common in oral streptococci species involved in clinical infection and that it depends on the action of human plasminogen activ ... | 2010 | 21072208 |