Publications
| Title | Abstract | Year(sorted ascending) Filter | PMID Filter |
|---|
| alpha-hemolytic streptococcal bacteremia: a review of 203 episodes during 1980-1991. | this is a review of 203 episodes of alpha-hemolytic streptococcal bacteremia during a 12-year period (1980-91) in a large community teaching hospital in the usa. there were 87 male and 116 female patients, with ages ranging from newborn infants to a 96-year-old; 118 patients (58.1%) were 60 years or older. 31 patients had endocarditis, 93 had bacteremia, and 79 had polymicrobial bacteremia. streptococcus sanguis, s. mitis, s. salivarius and s. intermedius accounted for 80% of the strains. some s ... | 1993 | 8248738 |
| production and characterization of monoclonal antibodies against bacterial lectin of eikenella corrodens. | a lectin-like substance (ecls) was purified from the eikenella corrodens 1073 cell and monoclonal antibodies were produced against it to confirm the role of ecls in adhesive properties of e. corrodens such as hemagglutination and coaggregation with oral bacteria. four hybridoma clones were selected. two of the antibodies were of the igg1 isotype and the others were of the igg2b isotype. these monoclonal antibodies inhibited both the hemagglutination of e. corrodens and the coaggregation with act ... | 1993 | 8254457 |
| phenotypic characterization of oral streptococci by classical methods. | the phenotypic characteristics of 215 strains of oral streptococci were compared on the basis of the results of sorbitol, raffinose and trehalose fermentation, ammonium from arginine production, aesculin hydrolysis, h2o2 production, susceptibility to 2 u bacitracin, and growth in 4% nacl solution. eleven different species were identified. among the most noteworthy findings were the low number of h2o2-producing strains of streptococcus sobrinus, the effective discrimination between streptococcus ... | 1993 | 8264436 |
| coaggregation of oral lactobacilli with streptococci from the oral cavity. | the ability of oral lactobacilli to coaggregate with streptococci and actinomycetes was investigated. of the 7 species of lactobacilli studied, only two were capable of coaggregation and the coaggregation was restricted to streptococci. lactobacillus salivarius strains (2/4) coaggregated with streptococcus salivarius, streptococcus gordonii, streptococcus crista and tufted streptococcus sanguis ii strains. lactobacillus fermentum (2/3) coaggregated with s. gordonii and s. sanguis. the coaggregat ... | 1993 | 8265207 |
| antimicrobial activity of cytotoxic drugs may influence isolation of bacteria and fungi from blood cultures. | the potential antimicrobial activity of cyclophosphamide, vincristine, and adriamycin against gram positive and negative bacteria and candida albicans was examined. the time taken for different microbial inocula to turn a simulated blood culture positive in the presence of different concentrations of these drugs was measured. doxorubicin retarded the growth of staphylococcus aureus, staphylococcus epidermidis, and streptococcus sanguis in a concentration dependent manner. cyclophosphamide and vi ... | 1993 | 8282838 |
| role of serum antibodies to streptococci in patients with iga nephropathy. | serum antibodies to whole cells of streptococci and serum immune complexes were investigated in patients with iga nephropathy accompanied by tonsillitis and in healthy adult controls by enzyme-linked immunosorbent assay (elisa). serum iga levels to streptococcus salivarius, s. sanguis i and s. pneumoniae were higher in patients with iga nephropathy than in healthy controls. the levels of igg to s. pyogenes t12, s. gordonii and s. sanguis ii in patients with iga nephropathy were also higher than ... | 1993 | 8285043 |
| chelate root filling cements: biological properties. | the purpose of this study was to test in vivo and in vitro the toxicity and the antibacterial activity of an experimental chelate cement (hn cement) using zinc oxide-eugenol cement as a reference. after subcutaneous injection of the spatulated hn cement paste in rats, it induced markedly less tissue injuries than did the zinc oxide-eugenol cement. in toxicity tests using cultures of human fibroblasts, the hn cement was found to be less toxic than the reference cement. bacteriologically, blood ag ... | 1993 | 8289021 |
| grouping of oral streptococcal species using fourier-transform infrared spectroscopy in comparison with classical microbiological identification. | the grouping and identification made by fourier-transform infrared spectroscopy (ft-ir) of 40 oral streptococcal strains was compared with their known taxonomic positions. grouping was obtained by cluster analysis on the spectral distances between the first derivative spectra of the strains. spectra were divided into five spectral 'windows' and cluster analysis was either on either a combination of all five windows or on a selected window. the oral streptococci were divided into two main cluster ... | 1993 | 8297255 |
| isomalto-oligosaccharide-containing lipoteichoic acid of streptococcus sanguis. basic structure. | the lipoteichoic acid of streptococcus sanguis dsm 20567 and of dsm 20068 was isolated by phenol/water extraction and hydrophobic-interaction chromatography. the preparations from both strains have an identical structure: a 1,3-linked poly(glycerophosphate) chain phosphodiester-linked to glc-(alpha 1-2)glc(alpha 1-3)acyl2gro as the lipid anchor. the chain is substituted with d-alanine ester and glycosyl residues which comprise mono-, di-, tri- and tetra-alpha-d-glucopyranosyl residues with (1-6) ... | 1993 | 8319683 |
| isomalto-oligosaccharide-containing lipoteichoic acid of streptococcus sanguis. microheterogeneity and distribution of chain substituents. | the lipoteichoic acid of streptococcus sanguis dsm 20567 contains a poly(glycerophosphate) chain, with 49% of the glycerophosphate residues being substituted with d-alanine ester, 35% with alpha-d-glucopyranosyl and alpha-isomalto-oligosaccharide residues. analysis of molecular species by affinity chromatography on concanavalin a showed all chains to be substituted and alanine ester and glycosyl residues to be present on the same rather than on separate chains. molecular species varied in the le ... | 1993 | 8319684 |
| [treatment with vancomycin of experimental endocarditis caused by streptococcus sanguis ii resistant to penicillin]. | streptococcus viridans continues to be the most frequent causal agent of infective endocarditis. treatment has become more complicated due to the increase in resistance to penicillin and cephalosporins. in order to study the possible efficacy of vancomycin, this antibiotic was investigated in rabbits as a monotherapy and in association with gentamicin. the effects were compared with a control group and a group given classical penicillin-gentamicin treatment. | 1993 | 8324022 |
| in vitro antimicrobial activity of calcium hydroxide cements on streptococcus sanguis nctc 7864. | several studies have questioned the antimicrobial role of calcium hydroxide cements. this study assessed the antimicrobial activity of four commercially available calcium hydroxide cements on streptococcus sanguis nctc 7864 using inoculated mueller-hinton growth medium. growth curves from optical density analysis, ph measurements, and viability counts were compared over a 24 h period. significant differences occurred (p < 0.05) between ph measurements but not the growth curves or the viability c ... | 1993 | 8330932 |
| a critical appraisal of positive cooperativity in oral streptococcal adhesion: scatchard analyses of adhesion data versus analyses of the spatial arrangement of adhering bacteria. | positive cooperativity is a mechanism proposed to account for the adhesion of bacteria to surfaces. in this paper, two methods that both claim to assess experimentally cooperative phenomena, viz. scatchard analysis of adhesion data (using adhesion to vials) and analysis of the spatial arrangement of adhering cells (using a flow chamber), were compared and critically evaluated. three oral strains were used and the substrata involved were glass (hydrophilic) and silicone-coated glass (hydrophobic) ... | 1993 | 8336110 |
| mechanisms of platelet aggregation by streptococcus sanguis, a causative organism in infective endocarditis. | the ability of certain strains of streptococcus sanguis to aggregate human platelets in vitro may be related to their virulence in the pathogenesis of infective endocarditis. we have studied the mechanisms of aggregation of human platelets by s. sanguis strain nctc 7863. platelet aggregation follows incubation of s. sanguis cells with platelet-rich plasma from normal, healthy adults, after a lag of 7-19 min. platelet aggregation was accompanied by 5-hydroxytryptamine release and thromboxane b2 p ... | 1993 | 8338784 |
| differential expression of salivary mucin bacterial aggregating activity with caries status. | 1. the low and high mol. wt mucin forms were isolated from saliva of caries-resistant (cr) and caries-susceptible (cs) individuals, and assessed for their bacterial aggregating potential towards s. mutans and s. sanguis, the common cariogenic microorganisms encountered in the oral cavity. 2. the high mol. wt mucin from both groups of subjects exhibited similar protein and carbohydrate content, but the level of covalently bound fatty acids was significantly lower in the cr group. the mucin from c ... | 1993 | 8344449 |
| characterization of allelic replacement in streptococcus parasanguis: transformation and homologous recombination in a 'nontransformable' streptococcus. | we have obtained transformants of streptococcus parasanguis fw213 containing allelic replacements in several chromosomal loci. transformation occurred following electroporation with nonreplicating plasmids carrying two antibiotic-resistance-encoding genes, one of which is inserted into dna homologous to the chromosomal target. in contrast with other streptococci, s. parasanguis fw213 is not transformed by linear dna. mutations in nonreplicating plasmid dna preferentially replaced their homologue ... | 1993 | 8344531 |
| transmission of mutans streptococci to infants following short term application of an iodine-naf solution to mothers' dentition. | in a randomized clinical trial, six applications of an i2-naf or a placebo solution were administered to the mothers' dentition at the time of tooth emergence of her infant, to evaluate its effect on transmission of mutans streptococci (ms) to the infant. ms and other bacterial levels were periodically monitored in 48 mother-infant pairs until the child's third birthday. there were significant reductions in maternal salivary ms (p = 0.04), lactobacilli (p = 0.04), total streptococci (p = 0.002), ... | 1993 | 8348786 |
| in vitro study of the penetration of three bacterial strains into root dentine. | the purpose of this study was to assess in vitro migration of the following three bacterial species into dentinal tubules: streptococcus sanguis, actinomyces naeslundii and prevotella intermedia. twenty-seven bovine incisors were randomly divided into three groups. only the root dentin was used for the experiment. within each group, the nine incisors were sectioned into 36 dentin blocks that were incubated with one of the tested bacterial suspensions. twelve samples were taken after 10, 20, and ... | 1993 | 8351128 |
| [a case of infective endocarditis in which a new vegetation appeared on a different site during chemotherapy]. | 42-year-old man, who had been febrile for about a month, was admitted to our hospital. laboratory testing showed leukocytosis and high titer of crp. streptococcus sanguis ii was detected in his blood culture. according to the echocardiogram, he had a vegetation on the anterior mitral leaflet, so he was diagnosed as having infective endocarditis. antibiotic susceptibility test using the disc method showed (3+) response to penicillin g. after intravenous administration of 20 million units of penic ... | 1993 | 8351441 |
| a simple method for monitoring mutans streptococci in margins of restorations. | plaque material collected from margins of restorations using a sharp toothpick was streaked across one and the same plastic strip from a commercially available test kit and inoculated in a liquid medium containing bacitracin. the reproducibility of the method was good. the method is simple, inexpensive and suitable for the chairside demonstration of the colonization of mutans streptococci in localized areas of the mouth, such as margins of restorations. | 1993 | 8354746 |
| bacteria reactive to plaque-toxin-neutralizing monoclonal antibodies are related to the severity of gingivitis at the sampled site. | certain monoclonal antibodies (mabs) neutralize the inhibition of hl60 cell growth by bacterial plaque extracts. the aim of this study was to enumerate and identify the bacteria reactive to these mabs at sites where periodontal disease was measured by gingival index, pocket depth and attachment loss. the bacterial colonies were grown on blood agar and the colonies counted directly and after immunoblotting. sites that bled on probing (n = 15) had a mean of 3.35% mab-positive colonies (sem = 0.52% ... | 1993 | 8355987 |
| unexpectedly high levels of some presumably protective secretory immunoglobulin a antibodies to dental plaque bacteria in salivas of both caries-resistant and caries-susceptible subjects. | the role of salivary antibodies in protection against cariogenic bacteria is actually a matter of debate. correlation between caries experience and naturally occurring antibodies was extensively investigated. comparison of salivary antibodies from 21 caries-resistant and 22 caries-susceptible subjects was carried out by using a new quantitative method. secretory immunoglobulin a (s-iga) antibodies to streptococcus sobrinus and streptococcus sanguis cells were detected in all salivas and at simil ... | 1993 | 8359882 |
| [a case of brain abscess due to streptococcus sanguis in association with multiple pulmonary arteriovenous fistulas]. | a case is reported here of brain abscess due to streptococcus sanguis in association with multiple pulmonary arteriovenous fistulas. a 19-year-old male who had been diagnosed in 1988 as pulmonary arteriovenous fistulas was admitted to our hospital for repeated epistaxis, headache, and vomiting. a brain abscess which was diagnosed using various roentogenologic examinations, worsened despite conservative therapy. additional surgical drainage was performed; s. sanguis was isolated from the drainage ... | 1993 | 8360524 |
| cytotoxic and antibacterial effects of orthodontic appliances. | the cytotoxic and antibacterial effects of orthodontic appliances were assessed. metallic devices used in orthodontics, such as molar bands, brackets, and archwires were tested by the agar overlay cytotoxicity test with mouse fibroblast cells. the same devices were tested for antibacterial effect with streptococcus mutans and s. sanguis. the multicomponent devices, which are bonded with silver- and copper-based brazing alloys, were more cytotoxic than the single-component devices, probably becau ... | 1993 | 8362202 |
| identity of viridans streptococci isolated from cases of infective endocarditis. | the oral streptococci have undergone considerable taxonomic revision in recent years but there is still little information concerning associations between the newly defined species and disease. this study examined the identities of 47 strains of oral streptococci collected from 42 confirmed cases of infective endocarditis. by means of recently described physiological schemes, the most common species identified were streptococcus sanguis sensu stricto (31.9%), s. oralis (29.8%) and s. gordonii (1 ... | 1993 | 8366515 |
| effect of thrombocytopenia on the early course of streptococcal endocarditis. | although platelets are a major factor in the pathogenesis of endocarditis, it is unclear if these cells promote or limit disease progression. to address this issue, the effects of thrombocytopenia on the early course of endovascular infection were examined. aortic valve endocarditis was produced in rabbits by using streptococcus sanguis m99. thrombocytopenia was induced by intravenous administration of antiplatelet serum. compared with controls (infected rabbits given nonimmune serum), thrombocy ... | 1993 | 8376837 |
| the effects of triclosan and zinc citrate, alone and in combination, on a community of oral bacteria grown in vitro. | a mixed-culture chemostat system has been used as a more stringent laboratory system for evaluation of the antimicrobial effects of triclosan and zinc citrate. the inhibitors were added alone, and in combination, as a pulse (a high initial inhibitor concentration which decreased with time) or as a dose (concentration of inhibitor increased with time) to give maximum concentrations of 34.5 mumol/l triclosan and 39.8 mumol/l zinc citrate. when dosed, triclosan inhibited a. viscosus and all five gr ... | 1993 | 8380287 |
| nucleotide sequence analysis of the termini and chromosomal locus involved in site-specific integration of the streptococcal conjugative transposon tn5252. | the 47-kb, broad-host-range, streptococcal conjugative transposon tn5252 is capable of site-specific integration into the pneumococcal chromosome. we present the nucleotide sequence of the terminal regions of the transposon and its target site in the pneumococcal genome. no inverted repeats were found at the termini of the transposon. a 72-bp region of the target was present on either side following the insertion of tn5252 and appeared to serve as a signal for its integration and excision. the d ... | 1993 | 8386725 |
| the wall associated lipoteichoic acid of streptococcus sanguis. | a competitive elisa is described for the measurement of lipoteichoic acid. the assay was used to determine the wall associated lipoteichoic acid of streptococcus sanguis which was found to represent only 2-4% of the phenol extractable content. extracellular lipoteichoic acid was detected even after exhaustive cell washing. this material was not the result of de novo synthesis because membrane de-polarization had no effect on the amount detected. since extracellular lipoteichoic acid interfered w ... | 1993 | 8386915 |
| agglutination of streptococcus mutans serotype c cells but inhibition of porphyromonas gingivalis autoaggregation by human lactoferrin. | the ability of various forms of human lactoferrin (lf) to agglutinate oral streptococcus mutans, strep. sobrinus, strep. rattus, strep. sanguis, porphyromonas gingivalis and actinobacillus actinomycetemcomitans cells was studied spectrophotometrically. fe3+ saturated lf was unable to agglutinate these bacteria, whereas iron-free lf (apo lf) effectively agglutinated strep. mutans cells but not the other bacteria. the efficiency and rate of agglutination of strep. mutans were somewhat lower with a ... | 1993 | 8387771 |
| longitudinal study of relations between human salivary antimicrobial proteins and measures of dental plaque accumulation and composition. | many studies have attempted to relate levels of antimicrobial proteins in saliva to oral health; results have been inconsistent, and one reason might be inconsistency of measures of plaque and saliva within subjects. this study investigated associations between plaque and salivary variables in longitudinal data. whole saliva, and 8-h plaque pooled from buccal first permanent molars, was obtained from 32 dental students on tuesdays from 3:00-6:00 p.m. over 4 weeks. salivary flow rate was determin ... | 1993 | 8392324 |
| the comparative activity of azithromycin, macrolides and amoxycillin against streptococci in experimental infections. | since serious sequelae may follow streptococcal infections, eradication is viewed as necessary for successful therapy. studies were therefore conducted to compare the effectiveness of azithromycin with other macrolide antibiotics and amoxycillin to eliminate these organisms in experimental localized infections. in a streptococcus pneumoniae lung infection induced by transtracheal challenge, the pathogen was not recovered after therapy with azithromycin (ed50 7.9 mg/kg), while clarithromycin was ... | 1993 | 8396094 |
| involvement of alpha 2-adrenoreceptors and g proteins in the modulation of platelet secretion in response to streptococcus sanguis. | in the presence of plasma, human platelets secrete the contents of their dense granules and then aggregate in response to certain strains of streptococcus sanguis. after 2 to 5 min of incubation with streptococci, platelets from fast-responding donors will begin to aggregate. slow responders aggregate after a longer delay. platelets may secrete after a short (fast responder) or long (slow responder) delay because of differences in the basal levels or responses to potentiating catecholamines. to ... | 1993 | 8397001 |
| purification and characterization of chimeric human iga1 and iga2 expressed in cos and chinese hamster ovary cells. | ag-specific chimeric human iga molecules, of the two human subclasses, iga1 and iga2, have been expressed in two mammalian cell systems. analysis of the secreted iga molecules, purified in milligram quantities from stable chinese hamster ovary transfectants by ag affinity chromatography, has allowed a direct comparison of the biologic properties of the two subclasses. hplc gel filtration analysis revealed that in both subclasses, the iga molecules associate predominantly into dimers. the monomer ... | 1993 | 8409433 |
| distribution and isolation frequency of eight streptococcal species in saliva from predentate and dentate children and adults. | the isolation frequency and distribution of eight recently defined streptococcal species have been investigated in the saliva of adults and that of both predentate and dentate children. the effects of frequency of sugar intake and tooth presence on the distribution of streptococcal species were also analyzed. saliva samples were collected from 121 subjects divided into three study groups: (a) 56 predentate children (predentate group), (b) 37 dentate children (dentate group), and (c) 28 adults (a ... | 1993 | 8418104 |
| saliva-binding protein (ssab) from streptococcus sanguis 12 is a lipoprotein. | two lipoprotein consensus sequences (leu-x-x-cys) are found in the presumptive signal peptide region (positions 12 to 15 and 17 to 20) of saliva-binding protein (ssab) from streptococcus sanguis 12. three analogs of ssab containing cys-->gly mutations were constructed by site-directed mutagenesis of psa2, the recombinant plasmid expressing ssab. [3h]palmitate was incorporated into ssab only when the native cys-20 residue was present. these data show that ssab is a lipoprotein and that cys-20 is ... | 1993 | 8419308 |
| home antibiotic therapy for streptococcal endocarditis: a call for a controlled trial. | 1993 | 8420289 | |
| the streptococcus sanguis platelet aggregation-associated protein. identification and characterization of the minimal platelet-interactive domain. | streptococcus sanguis expresses a cell wall-bound protein that induces the activation and aggregation of platelets. this platelet aggregation-associated protein (paap) contains a collagen-like, platelet-interactive domain within a 23-kda protein fragment. to isolate the minimal platelet-interactive domain, p23 paap was digested with collagenase, and the digest chromatographed to isolate fractions with activity inhibitory to s. sanguis-induced platelet aggregation. the active fraction was then di ... | 1993 | 8420939 |
| the dental status and attitudes of patients at risk from infective endocarditis. | infective endocarditis represents one of the few potentially fatal infections that may be caused in the patient by a dentist. efforts to reduce the incidence of this disease usually take the form of appropriate antibiotic cover prior to dental treatment, together with the establishment and maintenance of good oral health. this paper is a report of a survey on the dental health and awareness of 81 'at-risk' patients attending a cardiology outpatient clinic. it was found that whilst the patients w ... | 1993 | 8422317 |
| acute valvular obstruction from streptococcal endocarditis. | 1993 | 8427158 | |
| interfering alpha-streptococci as a protection against recurrent streptococcal tonsillitis in children. | recurrent streptococcal tonsillitis/pharyngitis is a great problem, especially in certain epidemiological situations. patients treated with antibiotics often have a disturbed normal throat flora and may lack, e.g., alpha-streptococci known in vitro to have an interfering activity against group a streptococci. thirty-one patients with recurrent streptococcal tonsillitis were given antibiotics for 10 days. at the end of this treatment they were sprayed in their mouths with four selected alpha-stre ... | 1993 | 8436458 |
| biosynthesis and characterization of phosphatidylglycerophosphoglycerol, a possible intermediate in lipoteichoic acid biosynthesis in streptococcus sanguis. | a membrane enzyme preparation from streptococcus sanguis was shown to convert sn-[14c]glycerol 3-phosphate and cdp-diacylglycerol (or deoxycdp-diacylglycerol) into a series of progressively higher-molecular-weight [14c]oligophosphoglycerophospholipids in vitro. the first oligophosphoglycerophospholipid to accumulate (termed lipid-1) was purified to homogeneity; chemical analysis, gas-liquid chromatography and chemical degradation studies indicated the most likely structure to be phosphatidylglyc ... | 1993 | 8443240 |
| mixed continuous cultures of streptococcus mutans with streptococcus sanguis or with streptococcus oralis as a model to study the ecological effects of the lactoperoxidase system. | mixed continuous cultures of streptococcus species were obtained, using complex carbohydrate (mucin) as a source of nutrients, to study the ecological effects of oxygen and the lactoperoxidase system. s. mutans nctc 10449 was unable to grow as a pure culture on mucin, but attained a significant population size in the presence of s. oralis and s. sanguis strains. the cell densities of the anaerobic mixed cultures decreased when oxygen was supplied, and s. mutans was more suppressed by oxygen than ... | 1993 | 8448770 |
| ph changes in human dental plaque from lactose and milk before and after adaptation. | ph changes in human dental plaque in vivo from lactose and milk have been studied in four separate mouthrinse experiments. (1) ph was measured in plaque samples of 12 subjects before and after 6 weeks of frequent daily mouthrinsing with 10% lactose. the ph decreases were significantly more pronounced after the adaptation period than before (p < 0.001), 4 of the 12 subjects showing about the same low plaque ph from lactose as from glucose. (2) similar to the previous experiment, frequent daily mo ... | 1993 | 8448773 |
| synergistic activity of ceftriaxone combined with netilmicin administered once daily for treatment of experimental streptococcal endocarditis. | we have conducted experiments to determine if one daily injection of netilmicin (net) would be synergistic with the broad-spectrum cephalosporin ceftriaxone (cro) in the treatment of experimentally induced endocarditis. rats with catheter-induced aortic vegetations were infected intravenously with 3 x 10(7) cfu of a beta-lactam-sensitive strain of streptococcus sanguis or a beta-lactam-resistant strain of streptococcus mitis. treatment with the antibiotics alone (cro, 10 mg/kg of body weight eve ... | 1993 | 8452350 |
| infective endocarditis after transesophageal echocardiography. | 1993 | 8462170 | |
| coaggregation: specific adherence among human oral plaque bacteria. | nearly all human oral bacteria exhibit coaggregation, cell-to-cell recognition of genetically distinct cell types. clumps or coaggregates composed of the two kinds of cells are formed immediately upon mixing two partner cell types. members of all 18 genera tested exhibit lactose-reversible coaggregation. many of these interactions appear to be mediated by a lectin on one cell type that interacts with a complementary carbohydrate receptor on the other cell type. a lactose-sensitive adhesin has be ... | 1993 | 8462782 |
| determination by heteronuclear nmr spectroscopy of the complete structure of the cell wall polysaccharide of streptococcus sanguis strain k103. | although complete structures of complex polysaccharides have traditionally been determined by chemical degradative methods, a number of recent developments in instrumentation have greatly facilitated this task. we illustrate the application of several of these methods in a determination of the complete covalent structure of the polysaccharide from streptococcus sanguis k103, which is composed of an octasaccharide repeating subunit linked by phosphodiester bonds. carbohydrate analysis by hpae-pad ... | 1993 | 8470820 |
| infectious crystalline keratopathy. the role of bacterial exopolysaccharide. | infectious crystalline keratopathy is a unique pauci-inflammatory infection of the cornea most commonly due to viridans type streptococci. we investigated the hypothesis that production of exopolysaccharide by streptococci, a property that can be induced by growth conditions, may contribute to the pathogenesis of infectious crystalline keratopathy by suppressing the ocular immune response. | 1993 | 8470987 |
| targeting and delivery of bactericide to adsorbed oral bacteria by use of proteoliposomes. | proteoliposomes having surface-bound succinylated concanavalin a (s-cona) have been prepared from a range of phospholipid mixtures by sonication (suv) and reverse phase evaporation (rev) covering a range of size (weight-average diameter (dw)) from approx. 35 to 310 nm and weight-average number of protein molecules per liposomes (pw) from approx. 50 to 3000. the targeting of the proteoliposomes to adsorbed biofilms of the bacteria streptococcus sanguis and streptococcus mutans has been assessed f ... | 1993 | 8476919 |
| role of superantigens in human disease. | superantigens include bacterial products (mainly of streptococci and staphylococci) that stimulate t cells to proliferate nonspecifically through interaction with class ii major histocompatibility complex products on antigen-presenting cells and then with variable regions on the beta chain of the t cell receptor complex. they include pyrogenic toxins (streptococcal scarlet fever toxins of serotypes a, b, and c, toxic shock syndrome toxin 1, and staphylococcal enterotoxin serotypes a, b, cn, d, e ... | 1993 | 8486972 |
| defence case known as 'heart'. | 1993 | 8494514 | |
| formation of alpha-(1-->6), alpha-(1-->3), and alpha-(1-->2) glycosidic linkages by dextransucrase from streptococcus sanguis in acceptor-dependent reactions. | dextransucrase from streptococcus sanguis 10558 was found to synthesize alpha-(1-->6), alpha-(1-->3), and alpha-(1-->2) linkages during an acceptor-dependent glucosyl transfer reaction. normally, new glucosyl residues are added at c-6 of monosaccharide acceptors. however, sugars blocked at c-6 also can serve as good acceptors. the disaccharide and trisaccharide products formed when methyl 6-bromo-6-deoxy-alpha-d-glucopyranoside was used as acceptor were isolated and characterized. both were foun ... | 1993 | 8495440 |
| xylitol and the bactericidal effect of chlorhexidine and fluoride on streptococcus mutans and streptococcus sanguis. | the present study was made to investigate the effect of xylitol on the bactericidal and bacteriostatic action of chlorohexidine diacetate (chx) and sodium fluoride (f) in atcc strains of streptococcus mutans and s. sanguis. standardized bacterial cell suspensions were used in tests for bactericidal effect and for inhibition of growth and sucrose fermentation. the results showed no interference of xylitol with the antibacterial effect of chx and f combinations. xylitol did not show any additive e ... | 1993 | 8498160 |
| oral streptococcal colonization of infants. | the objective of this study was to determine the prevalence and proportions of different streptococcal species among the streptococcal flora during infancy. a total of 60 oral samples were collected by oral swabbing of the buccal mucosa and alveolar ridges of 18 infants before tooth eruption and from buccal and lingual surfaces of teeth after tooth eruption. a total of 549 isolates on mitis salivarius agar were speciated, principally by recently revised biochemical criteria of kilian et al. stre ... | 1993 | 8510978 |
| dental plaque development on defined streptococcal surfaces. | coaggregations between bacterial species have been widely studied in vitro but not in the mouth. a new in vivo assay was used to measure the rate and composition of indigenous plaque formation onto bovine enamel chips covered with a continuous layer of bacteria. chips were covered with streptococcus oralis atcc 10557, which coaggregated with many oral species, or streptococcus gordonii s7, which did not coaggregate with these oral species, and placed in the mouth for 4 and 24 h. there were no di ... | 1993 | 8510979 |
| an analysis of the subgingival microflora in randomly selected subjects. | the aim of this study was to describe the presence of some microbial species in the subgingival microflora of a randomly selected subject sample. a further objective was to analyze the association between some microbiological characteristics and the periodontal conditions of the subjects. a total of 171 individuals aged 30-65 years were included. a pooled subgingival plaque sample was obtained from the mesial aspect of the 6 ramfjord teeth by the use of the paper-point method. the samples were p ... | 1993 | 8510980 |
| the antimicrobial activity of prevention mouthrinse. | prevention mouthrinse was designed to serve as a vital supplement to normal oral hygiene procedures. to determine the antimicrobial potency of this mouthrinse, minimal inhibitory concentrations (mics), bactericidal kinetics, and short-term exposure studies were conducted. a spectrum of oral microorganisms was employed in this investigation: streptococcus sanguis, streptococcus anginosus, streptococcus mutans, actinomyces viscosus, actinobacillus actinomycetemcomitans, fusobacterium nucleatum, ei ... | 1993 | 7880467 |
| antiseptic mouthrinse-induced microbial cell surface alterations. | this study determined the effect of an essential oil-containing mouthrinse, listerine antiseptic, on microbial cell surface morphology using scanning electron microscopy. twenty-four hour cultures of c. albicans, a. viscosus, s. sanguis, f. nucleatum, and a. actinomycetemcomitans were harvested and washed in buffer. triplicate samples were overlaid on poly-l-lysine coated coverslips, immersed in either listerine or buffer for 30 seconds, fixed in glutaraldehyde followed by post-fixing in 1% osmi ... | 1993 | 7880474 |
| involvement of porphyromonas gingivalis fimbriae in adherence to streptococcus gordonii. | adherence of porphyromonas gingivalis to early plaque bacteria, such as streptococcus gordonii, is considered an important colonization mechanism. the molecules that mediate this interspecies binding have not been determined. fimbriae were prepared from p. gingivalis 33277 by mild agitation, ammonium sulfate precipitation and deae-sepharose chromatography. in a nitrocellulose blot adherence assay, purified fimbriae inhibited s. gordonii g9b-p. gingivalis 33277 binding by up to 54%. in addition, ... | 1993 | 7903442 |
| antibacterial properties of eight dental cements. | the antibacterial action of a light-cured glass polyalkenoate vitrebond and an adhesive resin luting agent panavia ex was investigated and compared with six previously tested dental cements. the bacterial cultures used were six strains of streptococcus mutans, six of streptococcus sanguis and six cultures of carious debris from carious lesions. a modification of the agar diffusion method was used to test the antibacterial action of freshly mixed cements. in addition the cements were allowed to s ... | 1993 | 8144245 |
| species identification of oral viridans streptococci by restriction fragment polymorphism analysis of rrna genes. | oral streptococci formerly classified as streptococcus sanguis have been divided into six genetic groups. methods to identify those species by genotype are needed. this study compared restriction fragment polymorphisms of rrna genes (ribotypes) for seven s. gordonii, three s. sanguis, four s. oralis, three s. mitis, one s. crista, and seven s. parasanguis strains classified in previous dna hybridization studies, as well as one clinical isolate. dna was digested with hindiii, pvuii, hindiii and p ... | 1993 | 7691875 |
| demonstration of antigen-specific immune response against streptococcus sanguis. | the genetic control of streptococcus sanguis antigen response was studied. mice sensitized with inactivated s. sanguis organisms antigen-injected at the base of the tail developed footpad swelling. those with an i-ak,q,r region of h-2 showed a strong footpad response, whereas those with an i-ab,d,s region showed a weak response to s. sanguis cell wall antigen. footpad response was mediated by cd4+,8- t cells by using in vitro monoclonal antibody treatment. similar evidence of genetic control was ... | 1993 | 7694648 |
| dental infections as a risk factor for acute myocardial infarction. | the so-called classic risk factors of coronary heart disease (chd) do not explain all its clinical and epidemiological features. recent evidence suggests that certain infections, among them dental infections, are involved in the pathogenesis of chd. case-control studies have revealed an association between dental infections and acute myocardial infarction and chronic coronary heart disease. a large epidemiological survey revealed an association between missing teeth and chd and a recent 14-year ... | 1993 | 8131788 |
| short-term microbiological and clinical effects of subgingival irrigation with an antimicrobial mouthrinse. | fifty chronic adult periodontitis patients completed a 6-week controlled, double-blind, split mouth clinical study to determine the effects of subgingival irrigation with an antimicrobial mouthrinse on periodontal microflora, supragingival plaque, and gingivitis when used as an adjunct to normal oral hygiene. qualifying subjects had at least four sites, two on each side of the mouth, with probing depths between 4 and 6 mm, which bled on gentle probing. following baseline examinations, subjects r ... | 1994 | 8133413 |
| a quantitative study of calcium binding by isolated streptococcal cell walls and lipoteichoic acid: comparison with whole cells. | calcium-binding by surface components of oral bacteria may have important effects on remineralization/demineralization phenomena and plaque cohesion. additionally, some species export large quantities of lipoteichoic acid, possibly as a protective measure. measurement of calcium-binding can facilitate prediction of how this will effectively buffer plaque fluid calcium concentration and affect these processes. using equilibrium dialysis, we measured calcium-binding capacities and affinities at ph ... | 1994 | 7983261 |
| the targeting of phospholipid liposomes to bacteria. | phospholipid liposomes have been prepared from phospholipid mixtures including dipalmitoylphosphatidylcholine/phosphatidylinositol (dppc/pi) and dppc/dipalmitoylphosphatidylglycerol (dppc/dppg) mixtures and targeted to adsorbed biofilms of the skin-associated bacteria staphylococcus epidermidis and proteus vulgaris and the oral bacterium streptococcus sanguis. the effects of time, liposome concentration and density of bacteria in the biofilm have been studied in detail for staphylococcus epiderm ... | 1994 | 7986811 |
| a study of the subgingival microflora of hiv-seropositive and cd4 cell depleted children with hemophilia. | the cultivable subgingival bacterial flora from three hiv-seropositive and cd4 cell depleted children with hemophilia were examined in this study. the numbers of cd4 cells of the subjected children ranged from 4.9 to 16.3 per mm3 blood. streptococcus species, including, beta-hemolytic streptococcus identified as streptococcus mutans and streptococcus sanguis, were predominant in the subgingival plaque samples. actinomyces species were also frequently found. gram-negative rods other than capnocyt ... | 1994 | 7987969 |
| streptococcus sanguis osteomyelitis of the l2-3 lumbar vertebrae in seronegative rheumatoid arthritis. | 1994 | 8162652 | |
| novel automated microbial screening of platelet concentrates. | the recovery of bacteria and the speed of detection of microbial growth in platelet concentrates (pc) were studied, comparing a novel automated blood culture system (bact/alert) with two traditional methods. full-scale experiments were performed with a total of 33 units of pc (average content 320 x 10(9) platelets per unit) obtained from pooled buffy coats. six strains known as possible pc contaminants were tested: s. epidermidis, s. aureus, p. aeruginosa, b. cereus, e. aerogenes, and s. sanguis ... | 1994 | 8167004 |
| molecular characterization of a plasmid-borne (pgt633) erythromycin resistance determinant (ermgt) from lactobacillus reuteri 100-63. | lactobacillus reuteri 100-63 contains a 9.8 kb plasmid (pgt633) encoding resistance to the macrolide-lincosamide-streptogramin (mls) type b antibiotics. the restriction endonucleases acci, bamhi, bcli, ecori, ecorv, hhai, hindii, hpai, kpni, sali, and sspi were employed to establish a physical map of pgt633. next, genetic transfer experiments were conducted to establish the host range of pgt633. the results revealed that pgt633 replicated autonomously and encoded constitutive resistance to eryth ... | 1994 | 8171126 |
| inhibition of hydroxyapatite crystal growth by lipoteichoic acid. | lipoteichoic acids were purified from freshly isolated strains of streptococcus sanguis and lactobacillus casei, and from a laboratory strain of strep. rattus bht. their effects on the seeded growth of hydroxyapatite in 1 mm cacl2, 7.5 mm kh2po4, 50 mm hepes (ph 7.2) were determined. at lipoteichoic acid concentrations of 25 microm organic phosphate (po) and higher, the growth of hydroxyapatite appeared to be inhibited, at 100 microm po inhibition was complete for several hours. in contrast, low ... | 1994 | 8185499 |
| streptococcus sanguis bacteremia during ciprofloxacin therapy of a diabetic foot ulcer. | 1994 | 8192181 | |
| infective endocarditis in newborn infants with structurally normal hearts. | twelve infants with structurally normal hearts were demonstrated to have intracardiac vegetations on echocardiography and diagnosed as having infective endocarditis. all were found in the right side of the heart, most frequently at the junction of the superior vena cava and the right atrium and in no case involved the tricuspid or pulmonary valves. most were diagnosed in the course of investigation of repeatedly positive blood cultures, despite appropriate antibiotic therapy. coagulase-negative ... | 1994 | 8193471 |
| role of amoxicillin serum levels for successful prophylaxis of experimental endocarditis due to tolerant streptococci. | the importance of amoxicillin serum profiles for successful prophylaxis of experimental endocarditis in rats was assessed. animals with catheter-induced vegetations were challenged intravenously with large inocula of streptococcus sanguis and received one of the following amoxicillin dosages: single or multiple bolus injection of 40 mg/kg; 40 mg/kg administered as a continuous infusion over 12 h; or either 9 or 18 mg/kg administered over 12 or 24 h, respectively. the regimen producing a single t ... | 1994 | 8195626 |
| flow-cytometric identification and detection of porphyromonas gingivalis by a lps specific monoclonal antibody. | the purpose of this study was to identify porphyromonas gingivalis (p. gingivalis) by flow cytometry (fcm) using a monoclonal antibody (mab) omr-bg1e directed to p. gingivalis-specific lipopolysaccharide (lps). the p. gingivalis strains atcc 33277, 381, eso75, w50, and a7a1 were selected for the study. fusobacterium nucleatum (f. nucleatum), prevotella intermedia (p. intermedia), campylobacter rectus (c. rectus), streptococcus sanguis (s. sanguis) and actinobacillus actinomycetemcomitans (a. act ... | 1994 | 8195974 |
| hospital practices influence the pattern of infective endocarditis. | to identify factors contributing to infective endocarditis at a major teaching hospital. | 1994 | 8202007 |
| in vivo activities and penetration of the two components of the streptogramin rp 59500 in cardiac vegetations of experimental endocarditis. | we evaluated the in vivo activity and the diffusion of radiolabelled rp 57669 (rpi) and rp 54476 (rpii), the two components of the injectable streptogramin rp 59500, alone or in combination, in aortic vegetations from experimental endocarditis in rabbits. rpi and rpii demonstrated in vitro bacteriostatic and bactericidal synergy against a clinical strain of staphylococcus aureus resistant to methicillin and susceptible to erythromycin. in experimental staphylococcal endocarditis, rp 59500 was as ... | 1994 | 8203835 |
| [a case of hypertrophic obstructive cardiomyopathy (hocm) complicated by infective endocarditis (ie) and mitral regurgitation (mr)]. | the case of a 56-year-old man who underwent mitral valve replacement due to hocm complicated by ie and mr is reported. preoperative 2d echocardiographic assessment of the mitral valve revealed systole anterior motion (sam) and vegetation, and color flow doppler echocardiographic examination revealed severe mitral regurgitation. the left ventricular out-flow tract gradient decreased from 140 mmhg preoperatively to 60 mmhg postoperatively. mitral valve replacement should be considered in patients ... | 1994 | 8207888 |
| cell surface protein receptors in oral streptococci. | streptococci have a vast repertoire of adherence properties which include binding to human tissue components, epithelial cells and to other bacterial cells. these interactions are determined by the expression of cell-surface receptors some of which are species-specific. in the oral streptococci, two families of surface protein receptors with highly conserved amino acid sequences have been identified. the antigen i/ii family of polypeptides are wall-associated high molecular mass proteins (158-16 ... | 1994 | 7926661 |
| [löffler endocarditis fibroplastica with simultaneous infectious endocarditis]. | the clinical and immunological 8-year follow-up of a 45-year old female with hypereosinophilic syndrome and cardiac involvement of löffler's fibroplastic endocarditis which was complicated by infective endocarditis during immunosuppressive treatment is presented. all 3 stages of the disease were documented by clinical and histologic data: stage 1 by biopsy proven eosinophilic myocarditis and arteritis, stage 2 with berlin blue positive parietal thrombosis, and the fibrotic features of stage 3 bo ... | 1994 | 7927122 |
| nucleotide sequence of the streptococcus gordonii pk488 coaggregation adhesin gene, scaa, and atp-binding cassette. | human oral viridans group streptococci that coaggregate with actinomyces naeslundii pk606 express surface proteins related to scaa, the coaggregation-mediating adhesin of streptococcus gordonii pk488 (r. n. andersen, n. ganeshkumar, and p. e. kolenbrander, infect. immun. 61:981-987, 1993). the nucleotide sequence of the 6,125-bp ecori insert of pra1, containing scaa, the gene encoding scaa, was determined. six open reading frames (orfs) were identified. the orientation of four orfs, two upstream ... | 1994 | 7927711 |
| treatment with imipenem of experimental endocarditis caused by penicillin-resistant streptococcus sanguis. | the efficacy of imipenem alone or in combination with gentamicin for the treatment of experimental endocarditis in rabbits caused by a penicillin resistant strain of streptococcus sanguis was compared to that of gentamicin and penicillin g. in vitro, both beta-lactams were bactericidal in action and the combination of gentamicin and imipenem was synergistic after 4 h whereas penicillin g and gentamicin showed synergy after 8 h. antibiotic treatment was started two days after initiating infection ... | 1994 | 7928813 |
| detection of streptococcus pneumoniae dna in blood cultures by pcr. | we have developed a pcr assay, with primers derived from the autolysin (lyt) gene, for the detection of streptococcus pneumoniae dna in blood cultures. the predicted fragment of 247 bp was detected in all strains of pneumococci, embracing 12 different serotypes that were tested. although dna extracted from four viridans streptococci spp. streptococcus oralis, streptococcus mitis, streptococcus sanguis, and streptococcus parasanguis) gave amplification products, these were quite different from th ... | 1994 | 7929764 |
| evidence for an ecto-atpase on the cell wall of streptococcus sanguis. | certain strains of viridans streptococci bind platelets, which release atp from dense granules and then aggregate. by hydrolyzing the released atp to the platelet agonist, adp, cell wall-associated atpase activity of streptococcus sanguis may amplify the aggregation of platelets. to identify and characterize this ecto-atpase activity, whole cells were incubated with [14c]-atp. the cell-free nucleotides were separated by thin-layer chromatography and quantified by liquid scintillation counting. w ... | 1994 | 7936725 |
| stimulation of monocyte tissue factor expression in an in vitro model of bacterial endocarditis. | the coagulation system plays a major role in the formation of the infected endocardial vegetation in bacterial endocarditis. since monocytes can express tissue factor (tf) on their surfaces, they are thought to be responsible for the extrinsic activation of the coagulation cascade during this disease. the present study used an in vitro model in which fibrin plates, isolated adherent monocytes, and streptococcus sanguis were used as an analog for endocardial vegetations. adherence to fibrin by it ... | 1994 | 7960151 |
| action of sodium fluoride on phagocytosis by systemic polymorphonuclear leucocytes. | alterations in phagocytosis appear to be important in the onset and development of periodontitis. we investigated new substances that may be of use in the treatment of periodontitis. in a preliminary study, we tested the effect of sodium fluoride on phagocytosis by circulating polymorphonuclear leucocytes (pmns) in 10 replicate assays using blood from six healthy subjects. sodium fluoride was tested at concentrations of 1.0 micron to 4.0 microns against streptococcus oralis, streptococcus mutans ... | 1994 | 7962905 |
| postantibiotic effects and postantibiotic sub-mic effects of benzylpenicillin on viridans streptococci isolated from patients with infective endocarditis. | we investigated the postantibiotic effects (paes) and the postantibiotic sub-mic effects of benzylpenicillin on three strains of viridans streptococci isolated from infective endocarditis patients. the paes of benzylpenicillin on penicillin tolerant streptococcus sanguis tw-70 (0.4-3.9 h), penicillin tolerant s. sanguis tw-80 (0.3-6.3 h) and nontolerant streptococcus oralis tw-186 (0.5-3.1 h) were dependent on exposure time. the paes were not concentration dependent for s. sanguis tw-70 and s. s ... | 1994 | 7706164 |
| [infective endocarditis in icelandic children.] | the aim of this study was to investigate the predisposing conditions and etiology of infective endocarditis (ie) in icelandic children during the last ten years from 1984 to 1993. records from all cases of ie in iceland during this period were sampled. vegetations were confirmed in all patients by echocardiography and in cases of culture negative ie the diagnosis was made on clinical grounds and on the response to antibiotic treatment. during this period eight children were diagnosed with ie. fi ... | 1994 | 21593535 |
| characteristics of accumulation of oral gram-positive bacteria on mucin-conditioned glass surfaces in a model system. | strains of streptococcus, actinomyces and lactobacillus were grown on glass surfaces in semi-defined medium (ph 7.0) with mucin, at a dilution rate of d = 0.1 h-1, in a modified chemostat. the accumulation of cells followed four phases. in phase 1 (0-1 h), cells did not divide on the surfaces and adhesion accounted for rapid accumulation. phase 2 (1-4 h) comprised adhesion and cell division, and accumulation slowed, cell number doubling times (cdt) streptococcus, 2.7 h to 8.6 h, actinomyces, 2.3 ... | 1994 | 7478748 |
| growth-inhibitory effect of pyrophosphate on oral bacteria. | the purpose of this investigation was to determine whether pyrophosphate, the anticalculus component of tartar-control dentifrices, exerts antimicrobial activity against oral bacteria commonly found in supragingival plaque. minimal inhibitory concentrations of pyrophosphate were determined for streptococcus sanguis, streptococcus mutans (serotype c), actinomyces viscosus and actinomyces naeslundii. all of the bacteria tested were susceptible to pyrophosphate with identical minimal inhibitory con ... | 1994 | 7478751 |
| in vitro modulation of oral bacterial adhesion to saliva-coated hydroxyapatite beads by milk casein derivatives. | bovine caseinate, derivatives of its glycosylated moiety [caseinoglycomacropeptide (cgp)], and caseinophosphopeptides were evaluated as inhibitors of adhesion of oral bacteria to saliva-coated hydroxyapatite beads (s-ha). all milk casein-derived components behaved as potent inhibitors of streptococcus sanguis omz 9 and streptococcus sobrinus omz 176 adhesion to s-ha, whereas neither bovine serum albumin nor polyethyleneglycol were able to interfere with the adhesion of these strains. by contrast ... | 1994 | 7478758 |
| biochemical change exhibited by oral streptococci resulting from laboratory subculturing. | the intent of this study was to assess the effects of continued laboratory subculturing on selected biochemical properties of oral streptococci freshly isolated from dental plaque. six fresh isolates (3 streptococcus mutans and 3 non-mutans) and 2 laboratory strains were subcultured daily for a total of 225 transfers, and cells were harvested every 75 transfers from duplicate batch cultures grown with glucose at a constant ph. eleven biochemical properties were assayed with cells, membranes and ... | 1994 | 7478760 |
| use of restriction fragment polymorphism analysis of rrna genes to assign species to unknown clinical isolates of oral viridans streptococci. | this study evaluated restriction fragment length polymorphisms of rrna genes (ribotyping) for genotypic identification of 53 oral isolates classified as "streptococcus sanguis" by colony morphology. isolates were from 8-h buccal plaque on lower first permanent molars of 20 subjects. dna was digested with aatii and hybridized with digoxygenin-labeled cdna of escherichia coli 16s and 23s rrna. strains were ribotyped again with alwni or pvuii on the basis of the presence or absence of a 2,290-bp aa ... | 1994 | 7512095 |
| fine antigen specificity of human gamma delta t cell lines (v gamma 9+) established by repetitive stimulation with a serotype (kth-1) of a gram-positive bacterium, streptococcus sanguis. | we have established human gamma delta t cell lines specific for streptococcus sanguis (s. sanguis) kth-1 present in normal oral cavity flora. the cd4-cd8-cd3+v gamma 9+v delta 1-cd45ro+ cd25+ t cell lines showed a proliferative response to the streptococcal antigen (ag) in the presence of autologous antigen-presenting cells without apparent evidence of hla restriction. the proliferative response of the gamma delta t cell lines was completely blocked by anti-tcr gamma delta monoclonal antibody (m ... | 1994 | 7517873 |
| the use of lectins in monitoring degradation of oligosaccharide chains in mucin by oral streptococci. | the ability of utilize mucin oligosaccharides as sources of carbohydrate and energy is believed to be an important mechanism in the ecology of oral streptococci. in this study we have used digoxigenin-labelled lectins of various specificities to monitor changes in the nonreducing end groups of oligosaccharide chains following their degradation by streptococcus oralis ny 586 and streptococcus sanguis ny 584. the reaction of degraded mucin with peanut lectin, that recognizes the core disaccharide ... | 1994 | 7520835 |
| identification of a vibrio cholerae toxr-activated gene (tagd) that is physically linked to the toxin-coregulated pilus (tcp) gene cluster. | the toxin-coregulated pilus (tcp)-encoding gene cluster (tcp) specifies a type-iv pilus that is a major colonization determinant of vibrio cholerae. we have identified a gene 200 bp upstream from the tcp cluster that requires toxr for expression. we have designated this gene tagd (toxr-activated gene) and have shown that tagd is encoded on a 600-nt transcript. the deduced tagd product is a 164-amino-acid polypeptide (20 kda). interestingly, tagd shares a high degree of similarity to a protein of ... | 1994 | 7523254 |
| effects of subinhibitory concentrations of chemical agents on hydrophobicity and in vitro adherence of streptococcus mutans and streptococcus sanguis. | the aim of this investigation was to determine whether sublethal concentrations of chlorhexidine (cx), hexetidine (hx), cetylpyridinium chloride (cc), sodium dodecyl sulfate (sds), sanguinarine (sg), sodium fluoride (naf), and ammonium fluoride (nh4f) could affect hydrophobicity and adhesion of streptococcus sanguis and streptococcus mutans to saliva-coated hydroxyapatite (s-ha). determination of the minimum inhibitory concentrations (mics) showed that both species were susceptible to all agents ... | 1994 | 8001055 |
| the bacteriology of obstructive pneumonitis. a prospective study using ultrasound-guided transthoracic needle aspiration. | obstructive pneumonitis, the opacity that develops distal to an obstructing endobronchial lesion or external compression, is actually a combination of atelectasis, bronchiectasis with mucus plugging, and true parenchymal inflammation. in the majority of cases, it is usually not possible to determine whether infection is present or not from the radiographic findings alone. the aim of this study was to evaluate the bacteriology of obstructive pneumonitis and the influence of this result on the tre ... | 1994 | 8004324 |
| in vitro attachment of streptococcus sanguis to the dentin of the root canal. | the adhesion of a strain of streptococcus sanguis (nctc 7863) to the root canal dentin of bovine incisors was evaluated. samples (104) were prepared and smear layer was created on the root canal surface with a tungsten carbide bur. the samples were divided into four groups, one of them serving as a control sample and the other three each receiving a different treatment: 6% citric acid for 2 min (group 3), 6% citric acid for 2 min + 6.25% sodium hypochlorite for 1 min (group 2), 6% citric acid fo ... | 1994 | 8006568 |