Publications
| Title | Abstract | Year Filter | PMID(sorted ascending) Filter |
|---|
| analysis of the immunoglobulin a protease gene of streptococcus sanguis. | the amino acid sequence t-p-p-t-p-s-p-s is tandemly duplicated in the heavy chain of human immunoglobulin a1 (iga1), the major antibody in secretions. the bacterial pathogen streptococcus sanguis, a precursor to dental caries and a cause of bacterial endocarditis, yields iga protease that cleaves only the pro-thr peptide bond in the left duplication, while the type 2 iga proteases of the genital pathogen neisseria gonorrhoeae and the respiratory pathogen haemophilus influenzae cleave only the p- ... | 1991 | 1987065 |
| detection of immunoglobulin a1 protease-induced fab alpha fragments on dental plaque bacteria. | the mechanisms by which immunoglobulin a1 (iga1) protease activity may enable bacteria to evade the effect of specific secretory iga (s-iga) antibodies are not clear. a possibility which has received indirect experimental support is that bacteria, as a consequence of the protease activity, become coated with incompetent fab alpha fragments instead of with intact antibody molecules. using a combination of nonreducing sodium dodecyl sulfate-polyacrylamide gel electrophoresis and immunoblotting, we ... | 1991 | 1987074 |
| antibiotic-resistant oral streptococci in dental patients susceptible to infective endocarditis. | the aim of this study was to determine the incidence of amoxycillin and erythromycin resistance in oral streptococci in patients at risk from infective endocarditis. samples of gingival crevicular flora were taken from 65 patients at the site of dental treatment, prior to the prophylactic administration of amoxycillin (54 patients) or erythromycin (11 patients). samples were also taken from 65 dental patients who were not considered to be at risk from infective endocarditis. no isolate had a min ... | 1991 | 1990136 |
| association between the 65-kilodalton heat shock protein, streptococcus sanguis, and the corresponding antibodies in behçet's syndrome. | the etiology of behcet's syndrome (bs) is unknown, but a number of streptococcal species have been implicated. a hypothesis was postulated that a shared antigen, such as a stress protein, might account for some of these findings. indeed, a rabbit antiserum against a 65-kda heat shock protein of mycobacterium tuberculosis revealed a corresponding 65-kda band with all six streptococcus sanguis strains examined and s. pyogenes but not with s. salivarius. by applying a panel of nine monoclonal antib ... | 1991 | 2004821 |
| effects of chlorhexidine on proteolytic and glycosidic enzyme activities of dental plaque bacteria. | chlorhexidine was tested for its ability to inhibit a wide range of glycosidic and proteolytic enzyme activities produced by treponema denticola, porphyromonas gingivalis, bacteroides intermedius, actinobacillus actinomycemcomitans, capnocytophaga sputigena, capnocytophaga gingivalis, capnocytophaga orchracea, capnocytophaga sp., actinomyces viscosus, streptococcus mitior, streptococcus mutans, streptococcus sobrinus, streptococcus mitis, streptococcus anginosus, streptococcus oralis and strepto ... | 1991 | 2005230 |
| aggregation of group a streptococci by human saliva and effect of saliva on streptococcal adherence to host cells. | the aggregation of group a streptococci by whole, stimulated human saliva (whs) and the effect of saliva on streptococcal adherence to host cells was investigated. whs samples from 11 individuals were found to aggregate both m+ and m- group a streptococci to various degrees. the aggregating activity was sensitive to heat, edta, egta [ethylene glycol-bis(beta-aminoethyl ether)-n,n,n',n'-tetraacetic acid], sodium dodecyl sulfate, and lipoteichoic acid. none of the simple sugars tested, mercaptoeth ... | 1991 | 2019436 |
| surface hydrophobicity of small oral spirochetes. | the purpose of the present study was to determine the surface hydrophobicity of small oral spirochetes and to receive an impression of the molecular organization of the cell surfaces. nine spirochete strains with one endoflagellum from each cell-end (1:2:1 spirochetes) and eight with two endoflagella from each cell-end (2:4:2 spirochetes) from subgingival plaque were examined. two hydrophobicity assay systems were used: 1) two-phase partitioning and 2) salting-out aggregation by ammonium sulfate ... | 1991 | 2024570 |
| [personal identification from antibodies to oral streptococci using elisa]. | serum antibodies to oral streptococci were titrated by elisa for the purpose of personal identification. the bacteria concerned comprised 9 strains of streptococcus mutans, which are known to cause dental caries, and one strain of streptococcus sanguis commonly found in the oral cavity and harmless to the teeth. the quantities of igm antibodies to these streptococci were more or less dependent on the total levels of serum igm. however, no relation was found between the igg antibodies and the tot ... | 1991 | 2046172 |
| evaluation of a hygiene monitor for detection of contamination in dental surgeries. | routines for disinfecting working surfaces in dental surgeries are difficult to monitor without time-consuming and labour-intensive microbiological techniques, yet effective monitoring is a vital part of cross-infection control. easy to use, on-site methods would be valuable in this context. this study evaluates a portable monitor, the biotrace hygiene monitor, which uses bioluminescence to measure adenosine triphosphate (atp) on surfaces. under laboratory conditions, the ability of the monitor ... | 1991 | 2049220 |
| [infectious spondylitis of the axis. apropos of a case]. | 1991 | 2057734 | |
| mutacin activity of strains isolated from children with varying levels of mutants streptococci and caries. | a total of 157 isolates of mutants streptococci from plaque and saliva of 94 children were studied for their serotypes, mutacin production, frequency and spectrum of activity. of these isolates 71% were identified as serotype c and 22% as serotype e. serotypes f, d and g, and one untypable strain made up about 7% of the isolates. more than one serotype was found in 13% of the children. mutacin was produced by 83% of the isolates against one or more of the 14 indicator strains representing mutant ... | 1991 | 2064546 |
| synergistic degradation of mucin by streptococcus oralis and streptococcus sanguis in mixed chemostat cultures. | oral streptococci can grow in mucin by utilizing the oligosaccharide chains as a source of carbohydrate. the degradation of the oligosaccharides by these species is accomplished by exoglycosidase activities. in this experiment, it was investigated whether strains from different species could cooperate in the release of sugars from the mucin oligosaccharide. to this end, streptococcus sanguis ny 584 and streptococcus oralis strain ny 586 were grown continuously in a chemically-defined medium, wit ... | 1991 | 2066484 |
| [a case of kawasaki's disease combined with septicemia--isolation of streptococcus sanguis (mcls-1) and streptococcus pyogenes from blood at the acute stage]. | the patient was diagnosed as having kawasaki's disease. streptococci were isolated from cultures of all blood samples collected during the acute stage (the third, fifth and seventh day of the disease). the streptococci were subsequently identified as streptococcus sanguis (mcls-1) and streptococcus pyogenes. this finding may suggest induction of kawasaki's disease by s. sanguis mcls-1, and in this case, the complication of septicemia by s. pyogenes. | 1991 | 2066585 |
| [an alternative approach in the surgical treatment of infectious endocarditis. the fresh antibiotic-sterilized aortic valve homograft]. | following the pioneering work of ross and barratt-boyes, there is currently a strong evidence based on long-term follow-up data that valve homografts are the best valve substitutes in the aortic position. currently there exists a renewed interest in the use of fresh and cryopreserved homografts as we know that homografts show a prolonged durability together with the lack of thromboembolic complications. here we present the case histories of 3 patients undergoing aortic valve replacement by fresh ... | 1991 | 2068371 |
| comparison of the plaque microflora from natural and appliance-borne enamel surfaces. | human enamel sections and slabs, mounted on a mandibular removable appliance, were worn by 5 adult subjects for a 1-week period. plaque was allowed to accumulate on the in situ test sites and on the adjacent natural dentition. at the end of the experimental period, the plaque microflora associated with (1) the enamel sections, (2) the enamel slabs, and (3) the acrylic base of the appliance test site was compared with that obtained from lingual and interproximal areas of the lower molar teeth. in ... | 1991 | 2070382 |
| utilization of nitrogenous compounds by oral bacteria. | in terms of the crucial acid-base balance in dental plaque, the bacterial catabolism of nitrogenous compounds, such as peptides and amino acids, is of importance because the end-products can raise plaque ph. of particular significance is the fermentation of arginine by bacteria such as streptococcus sanguis, a numerically important plaque organism. aspects of the uptake of this amino acid were studied and it was also shown the organism can obtain arginine from small peptides, since it possesses ... | 1990 | 2073196 |
| infective endocarditis due to streptococcus sanguis i occurring on a normal mitral valve. | we report a 64 year old lady in whom infective endocarditis of the mitral valve occurred with no previous underlying heart disease. streptococcus sanguis i was isolated on blood culture and 2-d echo cardiography showed a vegetation on the anterior mitral leaflet. the viridans group of streptococci are classically associated with subacute endocarditis occurring on structurally abnormal valves, but involvement of a normal valve by these organisms is rare. | 1990 | 2079476 |
| the utilization of casein and amino acids by streptococcus sanguis p4a7 in continuous culture. | streptococcus sanguis p4a7 was grown in glucose limited conditions in continuous culture at ph 7.0 in a chemically defined medium containing either free amino acids or casein as the organic nitrogen source. apart from aspartate and threonine, which were poorly utilized at the higher dilution rates, all amino acids in the free-amino-acid medium were utilized to various extents. at the higher dilution rates, aspartate actually increased in concentration, probably due to deamidation of asparagine. ... | 1990 | 2079632 |
| effect of a triclosan/copolymer/fluoride dentifrice on the oral microflora. | eighty-one human subjects completed a double-blind study which examined the effects of a 0.3% triclosan/2% gantrez copolymer/0.243% sodium fluoride dentifrice on the microflora of supragingival dental plaque. subjects were divided into an experimental group which performed normal oral hygiene with the triclosan/copolymer/fluoride dentifrice and a control group which also performed normal oral hygiene with the same dentifrice minus the triclosan/copolymer. at baseline, 10 weeks, and 28 weeks, sup ... | 1990 | 2083042 |
| an in vitro method to study the adherence of bacteria to saliva-treated tooth enamel sections. | an in vitro bacterial adherence assay which employed human tooth enamel sections precoated with saliva and an epifluorescent staining technique with acridine orange was developed. the assay was used to study the adherence properties of fresh and type strains of the following oral bacterial species: bacteroides gingivalis, bacteroides intermedius, capnocytophaga species, haemophilus aphrophilus, actinobacillus actinomycetemcomitans, peptostreptococcus species, veillonella species, actinomyces isr ... | 1990 | 2087341 |
| sorbitol-fermenting predominant cultivable flora of human dental plaque in relation to sorbitol adaptation and salivary secretion rate. | the sorbitol-fermenting predominant flora of human dental plaque was studied in 12 people with low and 11 with normal salivary secretion rates before and after a period of frequent mouth rinses with sorbitol solution. a total of 277 sorbitol-fermenting isolates are described by their morphological and physiological characteristics. the flora was almost exclusively composed of gram-positive bacteria belonging to the genera streptococcus, lactobacillus and actinomyces in people with low secretion ... | 1990 | 2087343 |
| some aspects of protease production by a strain of streptococcus sanguis. | our previous studies indicated that arginine (arg) plays a key nutritional role in streptococcus sanguis p4a7 and that this organism can grow on whole casein as the sole nitrogen source. its protease activities were therefore studied after glucose-limited continuous culture in a chemically-defined medium with either free amino acids or casein as the nitrogen source. both culture supernatant and cell-associated endopeptidase (ep) and exopeptidase (amino-ap and carboxy-cp) activities were determin ... | 1990 | 2087351 |
| isolation and characterization of coaggregation-defective mutants of veillonella atypica. | spontaneously occurring coaggregation-defective mutants of veillonella atypica pk1910 were isolated and used to study the interactions of veillonella with streptococcus sanguis, strep. gordonii and strep. sm. three classes of mutants were isolated. the first class failed to participate in lactose-inhibitable coaggregations with streptococcal cells. the second class of mutants failed to coaggregate by the lactose-non-inhibitable interactions. the third group, isolated from the first group, failed ... | 1990 | 2088215 |
| identification of the rhamnose-sensitive adhesin of capnocytophaga ochracea atcc 33596. | the coaggregation of the gram-negative microorganism capnocytophaga ochracea atcc 33596 with several gram-positive bacteria, including streptococci, actinomyces and rothia, is mediated by rhamnose-sensitive adhesin(s). in the present study, mabs against the c. ochracea adhesin(s) were prepared. these antibodies inhibited all the rhamnose-sensitive interactions, indicating that they recognize epitopes at or near the rhamnose binding site of the adhesin. the monoclonals served as probes in immunob ... | 1990 | 2088216 |
| penetration of dentine by three oral bacteria in vitro and their associated cytotoxicity. | three common oral bacteria, namely streptococcus sanguis, actinomyces viscosus and corynebacterium spp. were studied with regard to their ability to penetrate etched and unetched dentine and for their effect on underlying cell cultures. the test organisms were grown in cylinders above dentine slices 100 and 500 microns thick for 72 hours. the slices were in contact with tissue culture medium covering a layer of fibroblasts. penetration of 100 microns slices was most rapid with s. sanguis, follow ... | 1990 | 2098336 |
| association of selected bacteria with the lesions of root surface caries. | plaque from the root surfaces of 165 subjects (mean age 65.5 years, 22-26 teeth/subject) was analysed for specific bacteria. five subject groups were defined: a (dmfs 16.4), b (dmfs 55.9), c1 (dmfs 55.6), c2 (dmfs 57.0) and c3 (dmfs 48.1). groups c1 and c2 had unrestored root surface lesions; group a, b and c3 were free of unrestored root caries and differed in their coronal caries experience. streptococcus mutans was isolated more frequently from the root lesions in groups c1 and c2 than from i ... | 1990 | 2098715 |
| successful prophylaxis of experimental streptococcal endocarditis with single-dose amoxicillin administered after bacterial challenge. | rats with catheter-induced aortic vegetations were challenged intravenously with various inoculum sizes of tolerant streptococcus sanguis or streptococcus faecalis. single-dose amoxicillin (40 mg/kg) was given intravenously either 30 min before or 30-240 min after bacterial challenge. prophylaxis of endocarditis against both strains was successful when the inocula used for challenge were in the range of the minimum inoculum producing bacterial endocarditis in 90% of control animals (id90) but wa ... | 1990 | 2105361 |
| inhibition of iga1 proteinases from neisseria gonorrhoeae and hemophilus influenzae by peptide prolyl boronic acids. | the alpha-aminoboronic acid analog of proline has been synthesized and incorporated into a number of peptides as the cooh-terminal residue. these peptide prolyl boronic acids are potent inhibitors of both the type 1 and type 2 iga proteinases from neisseria gonorrhoeae and hemophilus influenzae, but not of the functionally similar iga proteinase from streptococcus sanguis. the best inhibitors synthesized thus far have ki values in the nanomolar range (4.0 to 60 nm). these results indicate that t ... | 1990 | 2105953 |
| tolerance and efficacy of parenterally administered penicillin-streptomycin and orally administered amoxicillin or penicillin v for prophylaxis of experimentally induced streptococcal endocarditis. | a regimen of a single intramuscular dose of penicillin g-streptomycin was compared with regimens of three oral doses of amoxicillin and two oral doses of penicillin v to prevent streptococcus sanguis endocarditis in rabbits with experimentally induced valvular heart lesions. challenge doses of 10(4), 10(6), and 10(8) cfu of a strain of s. sanguis highly tolerant to penicillin and amoxicillin were used. the combination of penicillin and streptomycin was the only regimen tested that provided full ... | 1990 | 2109579 |
| molecular characterization of promoters of the lactococcus lactis subsp. cremoris temperate bacteriophage bk5-t and identification of a phage gene implicated in the regulation of promoter activity. | dna fragments from the temperate lactococcal bacteriophage bk5-t were cloned into the promoter-detecting plasmid pmu1328. five dna fragments conferring promoter activity were selected by transformation of streptococcus sanguis and were functional in escherichia coli, s. sanguis, and lactococcus lactis subspp. lactis and cremoris. the nucleotide sequences of these fragments were determined, and primer extension analysis was used to locate the site of initiation of transcription from each promoter ... | 1990 | 2111118 |
| effect of ph on acid production from sorbitol in washed cell suspensions of oral bacteria. | the acid production from sorbitol and glucose was studied under anaerobic conditions in resting cell suspensions of bacteria from the predominant sorbitol-fermenting human dental plaque flora, belonging to the genera streptococcus, lactobacillus and actinomyces. the acid production activity of the bacterial cells was followed by titration with alkali, at environmental ph 7.0, 6.0 and 5.0 after addition of carbohydrate solution. the metabolic end products formed in the suspensions were analyzed t ... | 1990 | 2111221 |
| [studies on delayed skin reactivity to streptococci in behçet's disease]. | delayed type hypersensitivity of patients with behçet's disease was investigated by intradermal skin test and prick test, using various inactivated microorganisms as antigens. in the intradermal skin test, 13 patients showed significantly increased skin reactivity to e. faecalis, compared with 5 normal controls. no significant differences were observed between these two groups in terms of reaction to s. pyogenes. prick test was performed in 11 patients and 6 controls, using s. pyogenes, s. sangu ... | 1990 | 2114734 |
| chemiluminescence of neutrophils from patients with behçet's disease and its correlation with an increased proportion of uncommon serotypes of streptococcus sanguis in the oral flora. | zymosan-induced chemiluminescence was investigated in whole blood and in neutrophils: in both, the peak count was frequently elevated in behçet's disease, and was significantly higher than in healthy controls; similarly the peak time was shorter. there were more uncommon serotypes of streptococcus sanguis in the oral flora of patients with behçet's disease. common serotypes were present in the flora of healthy controls, but not in patients with the disease. the percentage of strep. sanguis in th ... | 1990 | 2117912 |
| [fever during labor. a prospective study of 6,305 deliveries]. | 1990 | 2120318 | |
| studies of the subgingival microflora in patients with acquired immunodeficiency syndrome. | two unique forms of periodontal disease, hiv-gingivitis and hiv-periodontitis, have been described in patients with acquired immunodeficiency syndrome (aids). in order to determine the bacterial species associated with periodontitis in aids patients, the predominant cultivable microflora was examined in 21 subgingival plaque samples from 11 aids patients with periodontitis. the presence of putative periodontal pathogens including actinobacillus actinomycetemcomitans, bacteroides intermedius, por ... | 1990 | 2123926 |
| further in vivo studies on the plaque-inhibiting effect of chlorhexidine and its binding mechanisms. | the aim of the present study was to investigate the relative importance of chemical groups in the oral cavity which bind chlorhexidine of clinical significance. this was performed by clinical experiments where a test panel of 11 individuals rinsed with chlorhexidine at ph 7, ph 5.5, and ph 3. rinsing with 0.02 m edta was performed prior to the chlorhexidine rinse, because this procedure has been shown to enhance the antibacterial effect of chlorhexidine in vitro. however, pre-rinses with edta di ... | 1990 | 2127318 |
| the effects of dyadic combinations of endodontic medicaments on microbial growth inhibition. | in recent years dyadic combinations of endodontic medicaments have been used increasingly in clinical pediatric dentistry with little regard to the possibility of pharmacological antagonism of the components. in this investigation, a microbial growth inhibition assay was used to determine changes in antimicrobial activity in dyadic mixtures of endodontic medicaments. the combinations assayed were ledermix (corticosteroid-antibiotic) and calyxl (calcium hydroxide), ledermix and kri (iodoform), kr ... | 1990 | 2128893 |
| in vitro survival of bacteroides intermedius in five transport media, alone or in the presence of streptococcus sanguis. | the survival rate of bacteroides intermedius was first tested in monoculture, and streptococcus sanguis was then added in 5 different transport media; 2 nonnutritious media, the viability-preserving medium of the university of göteborg no. iv (vmg iv), reduced transport fluid (rtf), and 3 nutritious media, thioglycolate medium (tg), peptone yeast extract medium (py) and py medium with 1% glucose (pyg). all manipulations were carried out in an anaerobic chamber. after a given transport time (6 or ... | 1990 | 2129136 |
| disinfection by endodontic irrigants and dressings of experimentally infected dentinal tubules. | the effect of endodontic irrigants and dressings was tested on bacteria in bovine dentin specimens experimentally infected with enterococcus faecalis, streptococcus sanguis, escherichia coli, or pseudomonas aeruginosa. standardized, cylindrical dentin test pieces were prepared and cleaned by ultrasonic treatment with edta and sodium hypochlorite. the specimens were infected with the test organism for periods up to 14 days, and the degree of infection into the tubules was monitored using brown & ... | 1990 | 2133305 |
| [molecular cloning and expression of a dextranase gene from arthrobacter in streptococcus sanguis]. | the gene coding for a dextranase activity of arthrobacter cb-8, named dex gene, was isolated and cloned into escherichia coli and into streptococcus sanguis. the gene library was screened by transparent halo formation around the colonies grown on agar medium containing blue dextran. dna fragment consisting of about 3,200 base pairs was prepared for further cloning procedures. dextranase activity was detected in the periplasmic space of e. coli clones, using puc19, pva 838 and their derivatives. ... | 1990 | 2135413 |
| [initial-plaque forming ability of glucosyltransferases from streptococcus mutans serotype c strain]. | in order to clarify functional roles of extracellular glucosyltransferases (gtases) from s. mutans serotype c in initial stage of plaque formation, gtase-i and gtase-s were purified from culture fluids of strain ps 14. and an ability of these gtases to enhance cellular attachment of oral streptococci was investigated using 3h labeled resting cells of s. sanguis challis and s. milleri is 57. the results were as follows: 1) from culture fluids of strain ps 14 grown in a m 4 medium supplemented wit ... | 1990 | 2135610 |
| phenotypic characterization of streptococcus sanguis virulence factors associated with bacterial endocarditis. | certain strains of streptococcus sanguis adhere (adh+) selectively to human platelets and, in plasma, induce them to aggregate (agg+) into in vitro thrombi. in this study, we examined 18 recent endocarditis and dental plaque isolates of microorganisms that were biotyped as s. sanguis for coexpression of platelet interactivity phenotypes with another possible virulence factor in bacterial endocarditis, dextran synthesis. detectable production of extracellular glucosyltransferase ranged from 0.2 t ... | 1990 | 2137112 |
| effects of dosage, peak and trough concentrations in serum, protein binding, and bactericidal rate on efficacy of teicoplanin in a rabbit model of endocarditis. | the effect of dosage and the relative importance of peak and trough concentrations in serum for efficacy of teicoplanin were examined in a rabbit model of aortic valve endocarditis. concentrations of teicoplanin in serum exceeded the mic by several hundredfold, yet teicoplanin was less rapidly bactericidal than penicillin both in vitro and for endocarditis caused by a strain of streptococcus sanguis. because teicoplanin was 90% protein bound in rabbit serum, low free-drug concentrations probably ... | 1990 | 2140496 |
| selective modulation of bacterial attachment to oral epithelial cells by enzyme activities associated with poor oral hygiene. | the present investigation explored the hypothesis that elevated levels of certain enzymes in the gingival crevicular environment of individuals with poor oral hygiene and/or gingival inflammation may modify the surfaces of epithelial cells and thereby modulate the types of bacteria which attach and colonize. buccal epithelial cells treated with neuraminidase and certain proteases were used as a model for study. bacteria studied included streptococcus sanguis and streptococcus mitis which have be ... | 1990 | 2141877 |
| the influence of sucralose on bacterial metabolism. | sucralose (1',4',6' trideoxy-trichloro-galactosucrose) is a nontoxic, intensely sweet sucrose derivative that has been shown to be non-cariogenic in experimental animals. the purpose of this study was to determine whether certain oral bacteria could utilize sucralose. sucralose, as a sole carbon source, was unable to support growth of ten strains of oral bacteria and dental plaque. when sucrolose was incorporated into a liquid medium containing glucose or sucrose, all organisms tested displayed ... | 1990 | 2143512 |
| affinity purification of dextransucrase from streptococcus sanguis atcc 10558. | 1990 | 2146014 | |
| [the effect of zinc chloride mouthwashes on caries-inducing plaque streptococci. 1. in vitro research on the antimicrobial efficacy of zinc chloride on reference strains of streptococcus mutans (bht), streptococcus sanguis (hkop) and streptococcus salivarius (nctn 8618)]. | the antimicrobial efficiency of zinc chloride solution in concentration from 0.1% to 2.0% and 0.2% chlorhexidine solution has been examined on the strains of reference in a comparative study. three test methods were applied: the agar diffusion test, the dilution test and the suspension test. as was to be expected the antibacterial effect of the zinc chloride solution was dependent on concentration. between 0.1% and 2.0% the zinc chloride solution showed a bacteriostatic effect on the strains of ... | 1990 | 2146832 |
| influence of hydrophobicity on oligopeptide utilization by oral streptococci. | the growth responses of streptococcus mutans va-29r, streptococcus sanguis atcc 10556, and streptococcus mitior nih to hydrophilic and hydrophobic peptides obtained following isopropanol fractionation of trypticase were compared. although the two fractions contained peptides of similar molecular size, differences were observed with respect to amino acid compositions. s. mutans va-29r showed a pronounced difference in growth response to hydrophilic vs. hydrophobic peptides. while growth of this m ... | 1990 | 2147441 |
| [the effect of zinc chloride mouthwashes on caries-inducing plaque streptococci. 3. the antibacterial effect of zinc chloride on the species str. mutans, str. sanguis and str. salivarius in dental plaque]. | the quantitative behaviour of streptococcus mutans, streptococcus sanguis and streptococcus salivarius has been examined in initial findings and after application of 0.4% zinc chloride solution. after a 7 day rinsing the number of colony developing units of the species streptococcus mutans and streptococcus sanguis in the plaque decreased to about 30% of the determined initial values. the proportions of the species streptococcus mutans and streptococcus sanguis in the total streptococcus flora o ... | 1990 | 2149904 |
| glucosyltransferase production by streptococcus sanguis challis and comparison with other oral streptococci. | glucosyltransferase (gtf) activity in batch cultures of streptococcus sanguis strain challis in defined medium was maximum at peak growth and declined rapidly on further incubation into stationary phase. activity was present in spent culture medium and was associated with 2 polypeptides of approximate mrs 170 kda (90% of activity) and 155 kda (about 10% of activity). other s. sanguis strains produced similar antigenically-related polypeptides but with varying activities, and antibodies to the s. ... | 1990 | 2150879 |
| complete structure of the polysaccharide from streptococcus sanguis j22. | the cell wall polysaccharides of certain oral streptococci such as streptococcus sanguis strains 34 and j22, although immunologically distinct, act as receptors for the fimbrial lectins of actinomyces viscosus t14v. we report the complete covalent structure of the polysaccharide from s. sanguis j22 which is composed of a heptasaccharide subunit linked by phosphodiester bonds. the repeating subunit, which contains alpha-galnac, alpha-rhamnose, beta-rhamnose, beta-glucose, and beta-galactose all i ... | 1990 | 2157479 |
| the role of fibronectin binding in the rat model of experimental endocarditis caused by streptococcus sanguis. | inactivation of fibronectin (fn) binding by insertional mutagenesis of streptococcus sanguis with tn916 reduces virulence of this bacterium in the rat model of infective endocarditis (ie). transconjugants were screened for fn adherence using an elisa adherence test. one transconjugant had a decreased adherence to immobilized fn. southern hybridization demonstrated that the insertion occurred only once in this mutant. the parent strain and mutant strain jl113 were used as challenge strains in a r ... | 1990 | 2164050 |
| inhibition of the cooperative adhesion of streptococcus sanguis to hydroxylapatite. | the adhesion of streptococcus sanguis to hydroxylapatite is a process involving several adhesins and receptors. binding isotherms and scatchard plots of the adhesion suggest that cooperative interactions occur at low cell densities. it was found that sulfolane, a hydrophobic-bond diluent, was capable of inhibiting the cooperative adhesion of s. sanguis to saliva-coated hydroxylapatite beads. sodium thiocyanate, a chaotropic agent, inhibited not only cooperative adhesion, but also the adhesion th ... | 1990 | 2177022 |
| proteolytic activity of oral streptococci. | streptococcus mutans and streptococcus sobrinus were the least proteolytic of 8 species of oral streptococci while streptococcus oralis and streptococcus sanguis were the most proteolytic. degradation of fitc-bsa was significantly correlated with the hydrolysis of synthetic endopeptidase substrates. as s. oralis strains proliferate in dental plaque in the absence of dietary food their success, in vivo, might be due partially to their greater proteolytic activity compared to other oral streptococ ... | 1990 | 2182385 |
| molecular aspects of immunoglobulin a1 degradation by oral streptococci. | using a panel of 143 strains classified according to a novel taxonomic system for oral viridans-type streptococci, we reexamined the ability of oral streptococci to attack human immunoglobulin a1 (iga1) molecules with iga1 protease or glycosidases. iga1 protease production was an exclusive property of all strains belonging to streptococcus sanguis and streptococcus oralis (previously s. mitior) and of some strains of streptococcus mitis biovar 1. these are all dominant initiators of dental plaqu ... | 1990 | 2182537 |
| coaggregation of streptococcus sanguis and other streptococci with candida albicans. | thirteen strains of viridans group streptococci and two strains of other streptococci were tested for coaggregation with candida albicans. streptococcus sanguis strains generally exhibited low levels of adherence to 28 degrees c-grown exponential-phase yeast cells, but starvation of yeast cells for glucose at 37 degrees c (or at 28 degrees c) increased their coaggregating activity with these streptococci by at least tenfold. this was a property common to four c. albicans strains tested, two of w ... | 1990 | 2182544 |
| the microbiology of periapical granulomas. | of the 16 periapical granulomas studied, 14 (88%) yielded a positive growth when homogenized and cultured. the concentration of colony-forming units per milliliter of the suspension ranged from 10(1.3) to 10(4.0) (mean 10(2.2)). a total of 47 isolates comprising 26 (55%) facultative anaerobes and 21 (45%) strict anaerobes were obtained. the organisms most commonly cultured were veillonella species (15%), streptococcus milleri (11%), streptococcus sanguis (11%), actinomyces naeslundii (11%), prop ... | 1990 | 2183126 |
| streptococcal-host interactions. structural and functional analysis of a streptococcus sanguis receptor for a human salivary glycoprotein. | colonization of oral tissues by streptococcus sanguis may be influenced by a mucin-like salivary glycoprotein (sag) through a calcium-dependent interaction with a specific bacterial receptor. we report the nucleotide and deduced amino acid sequence of the s. sanguis receptor (ssp-5) and show that this protein may bind sialic acid residues of sag. the ssp-5 protein contains three unique structural domains, two of which consist of repetitive amino acid sequences. the n-terminal domain is comprised ... | 1990 | 2185241 |
| susceptibility of oral bacteria to phenoxyethanol and phenoxyethanol/chlorhexidine combinations. | a total of 57 bacterial strains (26 different species) which may be isolated from subgingival plaque were tested for their in vitro susceptibility to phenoxycthanol, a commonly-used antiseptic and preservative. ninety-five percent of the strains, including those associated with chronic inflammatory periodontal disease, were susceptible to concentrations of phenoxyethanol used topically (2% w/v). phenoxyethanol at a concentration of 1% (w/v) was also found that to have a rapid bactericidal effect ... | 1990 | 2202809 |
| high-level chromosomal gentamicin resistance in streptococcus agalactiae (group b). | this is the first report of high-level gentamicin resistance in a group b streptococcus. strain b128 of serotype ii was isolated from an infected leg wound in 1987. b128 was resistant to high levels of gentamicin as well as of all other available aminoglycosides and was also resistant to tetracyclines. no bactericidal synergism was found between ampicillin or vancomycin and any of these aminoglycosides. gentamicin, kanamycin, streptomycin, and tetracycline resistance determinants transferred by ... | 1990 | 2203311 |
| intra- and inter-specific transformation of streptococcus pneumoniae to penicillin resistance. | transformation studies were carried out with a penicillin susceptible (mic 0.006 mg/l) laboratory strain of streptococcus pneumoniae as recipient. donor dna was prepared from two clinical isolates of s. pneumoniae, four isolates of s. mitior and five isolates of s. sanguis. dna from both isolates of s. pneumoniae generated penicillin-resistant transformants (mics 0.03-2.0 mg/l). in addition, one isolate each of s. mitior and s. sanguis transformed the recipient to increased penicillin resistance ... | 1990 | 2211443 |
| incidence of bacteriocinogeny among fresh isolates of streptococcus mutans. | among 139 streptococcus mutans fresh isolates tested, using the deferred-antagonism test and streptococcus sanguis ny 101 as the indicator strain, we observed that the frequency of detection of inhibition zones was reduced by 19% (from 53 to 34%) when arginine (1%) was used in the overlay agar. among pigmented strains, the frequency of mutacin-like production was 70%. the frequency with which inhibition zones were detected varied from 7 to 91%, depending on the indicator strain used. these resul ... | 1990 | 2224647 |
| binding of viridans group streptococci to human platelets: a quantitative analysis. | the binding of viridans group streptococci with human platelets was analyzed by two-color flow cytometry. binding was detected within 15 s of mixing bacteria and platelets. at ratios of bacteria to platelets of 1:1, 10:1, 100:1, and 1,000:1, the percentages of bound streptococci (mean +/- standard deviation) were 93.2% +/- 5.4%, 80.0% +/- 8.6%, 39.8% +/- 11.1%, and 12.5% +/- 2.0%, respectively. binding of labeled bacteria was reversed by adding a 500-fold excess of unlabeled streptococci. these ... | 1990 | 2228249 |
| the effect of sucrose application and implantation of mutans streptococci on the microbial composition of three-week experimental plaque--an in situ study. | this study describes the predominant cultivable microflora of three-week-old plaque samples obtained from human enamel sites, on the basis of microbial identification of over 9000 fresh isolates. lower removable appliances, on which were mounted enamel sections and slabs, were worn by five young adult subjects under three experimental protocols. these were (1) 'normal' plaque conditions, (2) extra-oral sucrose applications nine times daily, and (3) inoculation of each subject's own mutans strept ... | 1990 | 2229607 |
| streptococcal endocarditis temporally related to transesophageal echocardiography. | a case of streptococcal sanguis endocarditis temporally related to a transesophageal echocardiogram is reported; and the literature on the incidence of bacteremia occurring during transesophageal echocardiography is reviewed. on the basis of this case and review of the literature, a reevaluation of the current guidelines for endocarditis prophylaxis during this procedure is recommended. | 1990 | 2245038 |
| arginine catabolism by strains of oral streptococci. | arginine catabolism via the arginine deiminase pathway was found in streptococcus sanguis 903. citrulline and ornithine were released from resting cells incubated with arginine, arginine-containing peptides, or saliva. maximum arginine catabolism by resting cells of s. sanguis 903 was found in the ph range 7-8 and at 45-48 degrees c. arginine deiminase activity was found in the cytoplasm and in the cell-wall extract of this strain, while ornithine carbamoyltransferase activity was found in the c ... | 1990 | 2248769 |
| lingual cellulitis causing upper airway obstruction. | a case is reported in which upper airway obstruction occurred in an immunosuppressed patient due to the presence of lingual cellulitis. | 1990 | 2248938 |
| purification and characterization of an outer membrane protein adhesin from haemophilus parainfluenzae hp-28. | outer membranes were isolated from haemophilus parainfluenzae hp-28 by a mild extraction method followed by sephadex g-150 gel filtration chromatography. the first peak (pool 1) recovered contained an activity which inhibited adherence of hp-28 cells to saliva-coated spheroidal hydroxyapatite. sodium dodecyl sulfate-polyacrylamide gel electrophoresis (sds-page) of pool 1 revealed a dominant protein band of 34 kda. the sds-page-purified 34-kda protein was excised from the gel and used for antibod ... | 1990 | 2254013 |
| platelet-interactive products of streptococcus sanguis protoplasts. | to isolate a more native, platelet-interactive macromolecule (class ii antigen) of streptococcus sanguis, cultured protoplasts were used as a source. protoplasts were optimally prepared from fresh washed cells by digestion with 80 u of mutanolysin per ml for 75 min at 37 degrees c while osmotically stabilized in 26% (wt/vol) raffinose. osmotically stabilized forms were surrounded by a 9-nm bilaminar membrane, as shown by transmission electron microscopy. protoplasts were cultured in chemically d ... | 1990 | 2254032 |
| predominance of resistant oral streptococci in saliva and the effect of a single course of josamycin or erythromycin. | we have investigated the influence of the macrolides erythromycin and josamycin on the selection of resistant oral streptococci by sampling saliva of volunteers before and after oral administration of 1.5 g of either agent followed by a further 0.5 g of the same drug after 6 h, as in routine prophylaxis for oral or dental procedures. the small proportion of resistant organisms present before antibiotic administration increased substantially 48 h after the macrolides were given. after antibiotic ... | 1990 | 2254223 |
| ability to bind salivary alpha-amylase discriminates certain viridans group streptococcal species. | a collection of 144 viridans group streptococcal strains recently characterized as part of a taxonomic study was examined for the ability to bind salivary alpha-amylase. this property was found in most strains of streptococcus gordonii and streptococcus mitis and in occasional strains of streptococcus anginosus and streptococcus salivarius. in contrast, all strains of streptococcus sanguis, streptococcus oralis, streptococcus vestibularis, and streptococcus mutans lacked alpha-amylase-binding ca ... | 1990 | 2254435 |
| comparison of the initial streptococcal microflora on dental enamel in caries-active and in caries-inactive individuals. | this study compared the initial (4 h) microflora on enamel in 7 caries-active and in 7 caries-inactive adolescents. in both groups the microflora was dominated by streptococci which comprised 61 and 78% (median values) of the total viable counts in caries-active and caries-inactive individuals, respectively (p less than 0.01). identification of a total of 700 streptococcal isolates according to a recently revised classification showed that the predominant streptococci belonged to the species str ... | 1990 | 2276164 |
| platelet aggregation by oral streptococci. | one proposed mechanism in the pathogenesis of infective endocarditis is the direct aggregation of platelets by the bacteria causing the disease. some, but not all, strains of streptococcus sanguis have been reported to aggregate platelets but the taxonomy of this and related taxa has changed recently. the ability to aggregate platelets by 24 genetically grouped laboratory stock strains was studied along with 8 recent isolates from cases of endocarditis. strains belonging to s. sanguis could aggr ... | 1990 | 2283042 |
| method and parameters for genetic transformation of streptococcus sanguis challis. | a simple procedure for genetic transformation of streptococcus sanguis challis was developed and standardized. during the exponential phase of growth, cells became competent while growing as diplococci in broth containing 10% foetal calf serum. high levels of competence were maintained by the cultures for 60 min. competent cells could be stored frozen without loss of competence for at least three years. using total chromosomal dna as donor, the dose-response curve for transformation of a point m ... | 1990 | 2284501 |
| antistaphylococcal activity of pentamidine. | pentamidine isethionate was bacteriostatic against staphylococcus aureus, staphylococcus epidermidis, streptococcus pyogenes, streptococcus sanguis, micrococcus sp., and candida albicans. s. aureus was inhibited by concentrations of 16 to 64 micrograms/ml and killed by 64 to greater than or equal to 128 micrograms/ml. staphylococcal killing was consistently greater in the presence of cations and was unaffected by methicillin resistance. | 1990 | 2285292 |
| cellular coaggregation of oral streptococcus milleri with actinomyces. | oral isolates of streptococcus milleri were examined for their ability to coaggregate with actinomyces. of the 68 s. milleri strains tested, including 3 reference strains, 40 strains coaggregated with actinomyces naeslundii wvu45 (actinomyces coaggregation group b) and 36 strains coaggregated with actinomyces viscosus t14v (actinomyces coaggregation group a). all s. milleri strains of serotypes b (4 strains), e (2 strains), and f (24 strains) coaggregated with both of the actinomyces. the coaggr ... | 1990 | 2294047 |
| colonization resistance of defined bacterial plaques to streptococcus mutans implantation on teeth in a model mouth. | we investigated the ability of streptococcus mutans c67-1 to colonize simple bacterial plaques and the effects of age and stability of the pre-formed plaque on colonization resistance. mixed-plaques of actinomyces viscosus wvu627, 'streptococcus mitior' lpa-1, and veillonella dispar omz193 were grown on tooth segments, mounted back to back for simulation of approximal sites in a model mouth for 66 h. s. mutans c67-1 was either included in the original inoculum or super-inoculated onto the develo ... | 1990 | 2307751 |
| the echocardiographic recognition of an atrial myxoma vegetation. | 1990 | 2309613 | |
| isolation of acid producing sorbitol-adapted bacteria from dental plaque using selective agar media. | acidogenic bacteria metabolizing sorbitol were isolated and identified from dental plaque of twenty nine volunteers, claiming to be users (sixteen) and non-users (thirteen) of sorbitol-containing chewing gum and candy. sixty bacterial strains were isolated, using improved selective agar media. the taxonomy of twenty strains, all gram-positive cocci, was determined employing a customized bbl minitekr system and other biochemical reactions. the majority of these strains represented streptococcus s ... | 1990 | 2314301 |
| [infectious endocarditis following orthotopic heart transplantation]. | infection remains a major problem in the early phase after heart transplantation. immunosuppressive therapy is the most important predisposing factor. it may also reactivate preexisting latent endogenous infections. unspecific symptoms and a chronic clinical course, as described in this report, may suggest infective endocarditis of the cardiac allograft. from this case, we do not suggest a general antibiotic prophylaxis for heart transplant recipients; however, special precaution should be consi ... | 1990 | 2316278 |
| enterococcal resistance to vancomycin and related cyclic glycopeptide antibiotics. | enterococci belonging to various species resistant to vancomycin and related cyclic glycopeptide antibiotics have been isolated from hospitalized patients in france, the uk and the usa. all such strains examined display inducible synthesis of a membrane protein associated with resistance. the mechanism by which the membrane protein acts has not been definitively established, but it may block the access of the antibiotic to its peptidoglycan target. that the protein could be a bypass enzyme has n ... | 1990 | 2318215 |
| differential response to benzylpenicillin in vivo of tolerant and non-tolerant variants of streptococcus sanguis ii. | a variant that was highly tolerant to benzylpenicillin was obtained from a non-tolerant clinical isolate of streptococcus sanguis ii by repeated exposure to penicillin. the rabbit model of endocarditis was used to investigate the efficacy of a high dose regimen of benzylpenicillin (250 mg/kg; peak serum concentration c. 25 mg/l) in the prophylaxis and treatment of endocarditis during challenge or infection with the non-tolerant parent strain or its tolerant variant. the two strains exhibited a s ... | 1990 | 2318747 |
| amylase-binding as a discriminator among oral streptococci. | the ability of 51 strains, belonging to streptococcus sanguis, 's. mitior', s. oralis and related groups, to bind salivary amylase was studied. most strains were grouped according to their dna-relatedness and then compared using 14 phenotypic tests. s. mitis, 's. mitior' and three relatively new groups of strains ('cr', 'mgh' and 'tufted mitior') bound salivary amylase, while strains of s. sanguis and s. oralis did not. the ability of strains to bind amylase or not was remarkably consistent with ... | 1990 | 2323538 |
| vancomycin resistance is encoded on a pheromone response plasmid in enterococcus faecium 228. | in enterococcus faecium 228, vancomycin resistance is encoded on a 55-kilobase conjugative plasmid, phkk100. this plasmid was transferred with high frequency into susceptible strains of enterococcus faecalis and conferred responses to pheromones produced by e. faecalis and streptococcus sanguis. phkk100 is the first plasmid described that mediates both vancomycin resistance and pheromone response. | 1990 | 2327781 |
| cohesion between oral streptococci and neisseria pharyngis on saliva-coated glass, in the presence and absence of sucrose. | ten strains of oral streptococci, comprising nine species, were screened for their in vitro cohesive interactions with a freshly isolated strain of neisseria pharyngis. strains of mutans streptococci, streptococcus salivarius, streptococcus sanguis i, streptococcus milleri and streptococcus mitis were able to cohere with n. pharyngis cells attached to a salivary pellicle adsorbed to glass. the cohesion was either due to coaggregation between the different genera or modification of the salivary p ... | 1990 | 2329945 |
| adherence of mutans streptococci to other oral bacteria. | adherence of mutans streptococci to strains of actinomyces viscosus, streptococcus sanguis, and streptococcus mitis immobilized on a nitrocellulose membrane was measured. strains of streptococcus mutans, s. sobrinus, and s. rattus bound in a lactose-independent manner to a variety of the actinomyces and streptococci. most of these reactions could proceed in the presence of whole saliva although adherence of s. rattus bht to the streptococci was inhibited by salivary molecules. in contrast, adher ... | 1990 | 2341174 |
| involvement of human mucous saliva and salivary mucins in the aggregation of the oral bacteria streptococcus sanguis, streptococcus oralis, and streptococcus rattus. | the contribution of human parotid (par) and submandibular/sublingual (sm/sl) saliva and of the human whole salivary mucin fraction (hwsm) to saliva-induced bacterial aggregation was studied for s. sanguis c476, s. oralis i581, and s. rattus hg 59. the mucous sm/sl saliva showed a much higher aggregation potency towards the s. sanguis and s. oralis strain than did the serous par saliva. the sm/sl saliva-induced aggregation was observed after 30 min, at 60 min followed by the par saliva-induced ag ... | 1990 | 2353808 |
| biochemical mechanisms of enhanced inhibition of fluoride on the anaerobic sugar metabolism by streptococcus sanguis. | the effect of fluoride on acid production by streptococcus sanguis atcc 10556 was compared under anaerobic and aerobic conditions. the rate of acid production under constant-ph and ph-free-fall conditions was determined during glucose metabolism by resting cells. anaerobic glycolysis was inhibited more strongly by fluoride than was aerobic glycolysis. intracellular levels of 3-phosphoglyceric, 2-phosphoglyceric, and phosphoenolpyruvic acids were lower under anaerobic conditions than under aerobi ... | 1990 | 2355117 |
| atypical supraglottitis caused by streptococcus sanguis. | a case of atypical supraglottitis in an 11-year-old boy is presented. the epiglottis was only mildly inflamed. the organism isolated from blood culture was streptococcus sanguis. this organism is a normal commensal of the oral cavity and has not previously been reported as a cause of supraglottitis. | 1990 | 2370475 |
| characterization of streptococcus gordonii (s. sanguis) pk488 adhesin-mediated coaggregation with actinomyces naeslundii pk606. | intergeneric coaggregation of streptococcus gordonii (s. sanguis) pk488 and actinomyces naeslundii pk606 was studied by using coaggregation-defective (cog-) mutants of both strains. a streptococcal protein of 38 kilodaltons was identified with anti-s. gordonii serum absorbed with cog- cells of the streptococcus. absorbed immunoglobulin g specifically blocked coaggregation of the streptococcus-actinomyces pair but did not affect the coaggregation of the streptococcus with other coaggregation part ... | 1990 | 2387635 |
| purification and partial characterization of a 65-kda platelet aggregation-associated protein antigen from the surface of streptococcus sanguis. | cells of streptococcus sanguis express a collagen-like immunodeterminant (class ii antigen) on their cell walls that induces aggregation of platelets in plasma. these platelet aggregation-associated proteins (paaps) are recovered in cell-free preparations obtained from cells of s. sanguis after 5 min of sonic or limited trypsin treatment. pretreatment of platelet-rich plasma with these soluble preparations selectively inhibits platelet aggregation in response to s. sanguis cells. a paap antigen ... | 1990 | 2387841 |
| structure of a streptococcal adhesin carbohydrate receptor. | interactions between complementary protein and carbohydrate structures on different genera of human oral bacteria have been implicated in the formation of dental plaque. the carbohydrate receptor on streptococcus sanguis h1 (one of the primary colonizing species) that is specific for the adhesin on capnocytophaga ochracea atcc 33596 (a secondary colonizer) has been isolated from the streptococcal cell wall, purified, and structurally characterized. the hexasaccharide repeating unit of the polysa ... | 1990 | 2387843 |
| cerebral botryomycosis: case study. | after oral surgery, a 32-year-old man developed a brain abscess. actinomycosis was suspected due to history, clinical findings, response to penicillin therapy, and demonstration of "sulfur granules" in the surgical specimen, but anaerobic cultures were negative for actinomyces. aerobic cultures yielded streptococcus sanguis and pseudomonas cepacia. coccoid organisms demonstrated histologically reacted positively with periodic acid-schiff, gomori's methenamine silver, and brown and brenn stains, ... | 1990 | 2388002 |
| stimulation of the growth of streptococcus sanguis (nctc 7864) by zinc in vitro. | zinc, which is present in many materials used in dentistry, including restorative and endodontic materials and mouthwashes, is reputedly bactericidal. however, the addition of this element at concentrations in the range 10-50 ppm to cultures of streptococcus sanguis (nctc 7864) stimulated the growth of the micro-organism relative to that of controls. a second antibacterial element, namely fluoride, reduced growth. similar results were obtained whether the organism was grown aerobically or anaero ... | 1990 | 2391185 |
| [immunological analysis of streptococcus sanguis antigens]. | the exact cause of behçet's disease is still unknown. recently, advanced bacterial studies revealed that behçet's disease was related to streptococcus (s.) sanguis. however, the antigenicity of s. sanguis has not been fully studied. in this study, we clarified the antigenicity of s. sanguis. we made s. sanguis antigens: mechanical braun extract (mbe) and crude cell wall (ccw) from the whole cells, membrane fraction (mf) and cytoplasmic fraction (cf) from mbe, cell wall fragment (cwf) and lipotei ... | 1990 | 2396588 |
| [a case report of mitral valve regurgitation due to the infective endocarditis associated with the straight back syndrome]. | a 54 year-old man was admitted to our hospital with a compliant of high fever following the dental treatment. he had the straight thoracic spine with absence of physiological kyphosis. blood culture was positive for streptococcus sanguis i. echocardiography revealed the mitral valve regurgitation with some vegetation at the ruptured chordae tendinae of the posterior leaflet. the operation was performed after the sign of the inflammation was disappeared. we performed the mitral valve reconstructi ... | 1990 | 2398884 |
| an investigation into the mechanism of protection by local passive immunization with monoclonal antibodies against streptococcus mutans. | local oral passive immunization with streptococcus mutans-specific monoclonal antibody (mab) (guy's 13) prevented recolonization by indigenous s. mutans in human volunteers who had first been treated with a conventional antibacterial agent (chlorhexidine). the f(ab')2 fragment of the mab was as protective as the intact immunoglobulin g, but the fab fragment of the molecule failed to prevent recolonization of s. mutans. in subjects receiving the mab fab fragment, s. mutans levels in dental plaque ... | 1990 | 2401569 |
| competence-specific autolysis in streptococcus sanguis. | streptococcus sanguis strain wicky activated to competence for genetic transformation is known to undergo a rapid decrease in optical density upon transfer to an alkaline buffer containing reducing agents. we studied the mechanism of this autolysis-like process and made the following observations. the process was specific because preincubation of the competence inducing factor with a specific inactivating protein prevented both cellular lysis and acquisition of competence for genetic transformat ... | 1985 | 2410542 |
| the phylogenetic position of streptococcus and enterococcus. | streptococcus pyogenes, s. equinus, s. bovis, s. salivarius, s. sanguis, s. mutans, s. rattus, s. cricetus, s. lactis, s. raffinolactis and enterococcus faecalis have been characterized by oligonucleotide cataloguing of their 16s ribosomal rna. all the organisms form a loose but coherent group that is phylogenetically equivalent to those of lactobacilli, bacilli, the brochothrix and listeria group, and related taxa that constitute one of several sublines within the 'clostridium' branch of gram-p ... | 1985 | 2410543 |
| immunological study of lactate dehydrogenase from streptococcus mutans and evidence of common antigenic domains with lactate dehydrogenases from lactic bacteria. | rabbit polyclonal antibodies directed against purified streptococcus mutans l-(+)-lactate dehydrogenase reacted with the purified enzyme, giving a marked deviation of its kinetic parameters. the enzyme affinity for pyruvate or nadh decreased in the presence of antibody, the affinity for fructose 1,6-diphosphate (fdp) appeared to be slightly affected, and the cooperativity of the ligand binding was lowered. a partial protective effect was observed when the enzyme was preincubated with fdp prior t ... | 1986 | 2416689 |