Publications
| Title | Abstract | Year(sorted descending) Filter | PMID Filter |
|---|
| colonization of the subgingival area by bacteroides gingivalis. | the initial event in colonization of the subgingival area by b. gingivalis is its attachment to host cells and gram-positive bacteria in pre-formed plaque. the level of b. gingivalis is partly governed by products of other plaque bacteria, especially by sanguicin. once b. gingivalis resides in its nidus and starts to proliferate, expulsion of pre-existing residents may occur, especially of attached gram-positive bacteria, through the inhibitory action of the b. gingivalis product, hematin. the b ... | 1984 | 6583244 |
| inhibition of lactose-reversible adherence between actinomyces viscosus and oral streptococci by salivary components. | 1984 | 6584210 | |
| factors involved in artificial caries induction by oral streptococci in extracted human teeth. | this study assesses the abilities of s. mutans gs5 and bht and s. sanguis g9b to produce subsurface lesions on smooth surfaces of extracted human teeth and examines factors which might be responsible for any differences encountered. teeth were incubated in brain heart infusion broth containing 2% sucrose and a pure culture of the organism to be tested, the media being changed each day for eight days. surface and media ph's were measured. the mineral content of both the surface enamel and the sub ... | 1984 | 6584469 |
| an investigation of the effects of maltose and sucrose in the diet on the microbiology of dental plaque in man. | in a double-blind cross-over study, 24 dental students consumed 150 g of sucrose or maltose a day in various foods. after 15 days, plaque samples were collected from the distal surface of upper right first premolars; post-diet samples were collected four months later. the median total anaerobic count of plaque exposed to sucrose was significantly lower compared with maltose samples (p less than 0.05). glucan-producing organisms per 100 anaerobes in the sucrose samples compared with the maltose ( ... | 1984 | 6586127 |
| [bacteria as an etiological agent of human dental caries]. | 1984 | 6589328 | |
| [a periodontologic study of bacteria in the periodontal pocket--in vitro adherence of bacteria to the metal materials of periodontal probes]. | 1984 | 6590694 | |
| [coaggregation reactions between oral bacteria]. | 1984 | 6591474 | |
| effect of chlorhexidine and iodine on the composition of the human dental plaque flora. | 1984 | 6592041 | |
| effects of chlorhexidine, iodine, and 5,7-dichloro-8-hydroxyquinoline on the bacterial composition of rat plaque in vivo. | 1984 | 6592046 | |
| [effect of professional plaque removal on the recolonization of tooth surfaces by glucan-forming streptococci]. | 1984 | 6592087 | |
| immunologic profile of juvenile periodontitis. i. lymphocyte blastogenesis and the autologous mixed lymphocyte response. | studies of blastogenesis of lymphocytes in culture from juvenile periodontitis (jp) patients have been inconclusive. experiments demonstrating differences in lymphocyte blastogenesis to preparations of putative periodontopathogens in jp and phytohaemagglutinin (pha) were performed. variables in the blastogenesis assay system recently reported were controlled which included using a range of cell and activator concentrations, incubation times of 3, 5 and 7 days, conical-bottomed microtest wells an ... | 1984 | 6592318 |
| human neutrophil migration under agarose to bacteria associated with the development of gingivitis. | in clinically healthy gingiva and increasingly with the development of inflammation, neutrophils are found in the gingival tissues and sulcus. this study evaluated the relative ability of bacteria associated with gingival health and developing inflammation to stimulate this increase in neutrophil accumulation. dialyzed bacterial sonic extracts (be) in buffer and pooled human serum (phs) from pure cultures of streptococcus sanguis. actinomyces viscosus, a naeslundii, bacteroides intermedius, fuso ... | 1984 | 6592328 |
| expression of a streptokinase gene from streptococcus equisimilis in streptococcus sanguis. | using recombinant dna techniques, we introduced a previously cloned streptokinase gene from streptococcus equisimilis into the challis strain of s. sanguis (group h). the gene was expressed in the new host under the control of its own promoter and the gene product had biological properties identical to authentic streptokinase. however, the molecular weight of cloned streptokinase (42 k) as expressed by s. sanguis was substantially lower than that of authentic streptokinase (47 k). since the clon ... | 1984 | 6593564 |
| growth and acid tolerance of human dental plaque bacteria. | pure cultures of representative strains of cariogenic and non-cariogenic plaque bacteria were assessed for their ability to initiate and maintain growth in broths, adjusted to initial ph levels of 7.0, 5.5 or 5.0, and to produce lactic acid from sucrose or glucose in resting-cell suspensions at ph 6.5, 5.0, 4.5 and 4.0. streptococcus mutans, lactobacillus casei and streptococcus faecalis showed greater acid tolerance than strains of streptococcus sanguis, streptococcus salivarius, streptococcus ... | 1984 | 6594096 |
| a simple method for extracting human lymphocyte stimulants from human dental plaque bacteria of the genus actinomyces. | the effect of acid concentration on the hot-acid extraction of antigens from actinomyces viscosus that stimulate human peripheral blood lymphocytes in vitro was tested. the optimum ph for release of these antigens in a soluble low molecular-weight form was ph 2.3. preliminary purification on sepharose 4b demonstrated that most of the lympho-stimulatory material (about 90 per cent) had a mol. wt of about 100,000. this partially-purified antigenic material was mainly protein. the ph 2.3 hot-acid e ... | 1984 | 6594104 |
| the localization of blood-borne bacteria in instrumented unfilled and overinstrumented canals. | 1984 | 6594418 | |
| partial chemical characterization and biological activities of sulphated glycoproteins isolated from in-vivo pilocarpine-stimulated secretions of rat minor salivary glands. | following the incorporation of [35s]-sulphate into rats, 35s-labelled sulphated glycoproteins were isolated from the minor salivary gland secretions of pilocarpine-stimulated, immobilized animals. the secretory products were initially resolved on sepharose 4b into two major radioactive fractions, one of which appeared at the void volume and represented only 7 per cent by weight of the applied fraction. the bulk of the products were of lower molecular weight and were further resolved by deae-seph ... | 1984 | 6596032 |
| [effect of sugar substitutes on the growth and acid production of 2 types of acidogenic bacteria of the oral cavity]. | 1984 | 6597166 | |
| [structural and ecological aspects of subgingival microflora]. | 1984 | 6597611 | |
| in-vivo dental plaque-forming ability and relative cariogenicity of the bacteria streptococcus mitis and streptococcus sanguis i and ii in mono-infected gnotobiotic rats. | sixteen strains of streptococcus mitis, streptococcus sanguis i and strep. sanguis ii were tested for cariogenic potential and in-vivo plaque-forming ability in a gnotobiotic wag/rij rat test system. all strains produced far less fissure plaque in vivo than strains of streptococcus milleri or streptococcus mutans. there was less extracellular matrix around cells of strep. mitis or strep. sanguis than around strep. mutans, in the fissures. dense sheets of cells were observed only with strep. muta ... | 1984 | 6598361 |
| antibacterial effects of fluoride. | 1984 | 6599295 | |
| effect of volume of blood cultured on detection of streptococcus viridans bacteraemia. | fifty eight patients undergoing dental extraction each had 45 ml blood collected. this was divided into 30 ml and 15 ml blood samples for culture. the 30 ml sample was inoculated into 120 ml nutrient broth with 0.05% liquoid and the 15 ml sample into 60 ml of identical broth so that the final dilution of blood in broth was always 1/5. bacteraemia due to viridans streptococci was found in 27 and 15 patients by culturing the 30 ml and 15 ml blood samples respectively. only one further case of stre ... | 1984 | 6373833 |
| streptococcus mutans and streptococcus sanguis in plaque from orthodontic bands and brackets. | 1984 | 6587970 | |
| microbiological assessment of dental plaque on bovine enamel implants worn intra-orally in children. | nine caries-active children, each from six to nine years old, wore small removable enamel implants intra-orally for four weeks as part of an effort to develop removable model systems for studying dental plaque in fissures. the implants, consisting of two enamel cubes arranged to simulate a fissural space, were cemented in box preparations in stainless steel crowns on pulpotomized primary molars. upon removal, the fissural spaces were opened to facilitate plaque harvesting. the plaque samples wer ... | 1984 | 6588083 |
| inhibition of bacterial aggregation by serum- and blood-derived proteins. | human and animal sera contain potent inhibitors of saliva-mediated aggregation of oral streptococci. the inhibitors consist of a high-molecular-weight heat-labile factor and a lower-molecular-weight heat-activated factor. the latter appears to be serum albumin. analyses of purified blood-derived proteins indicated that several high-molecular-weight proteins (fibrinogen, fibronectin, and ferritin) were able to inhibit aggregation at low concentrations. these data suggest that high-molecular-weigh ... | 1984 | 6690411 |
| regulation of glucose metabolism in oral streptococci through independent pathways of glucose 6-phosphate and glucose 1-phosphate formation. | in vivo rates of glucose uptake and acid production by oral streptococci grown in glucose- or nitrogen-limited continuous culture and batch culture were compared with the glucose phosphorylation activities of harvested, decryptified cells. the strains examined contained significant phosphoenolpyruvate-phosphotransferase system (pts) activity, measured by a glucose 6-phosphate (g6p) dehydrogenase-linked assay procedure, but this activity was insufficient to account for the in vivo glucose uptake ... | 1984 | 6693352 |
| role of granulocytes in the prevention and therapy of experimental streptococcus sanguis endocarditis in rabbits. | the contributions of granulocytes to the prevention and therapy of streptococcus sanguis endocarditis with procaine benzylpenicillin (pbp) was investigated in rabbits. depletion of granulocytes by treatment with mechlorethamine appeared to have no significant effect on either the prophylactic or therapeutic activities of pbp. administration of 3,000 iu of pbp before inoculation with s. sanguis retarded the course of the endocarditis for only 24 h whether granulocytes were normal or depressed in ... | 1984 | 6712203 |
| broad host range of streptococcal macrolide resistance plasmids. | four macrolide-lincosamide-streptogramin b resistance plasmids transferred into 13 recipients belonging to streptococcus, staphylococcus, and listeria genera. the plasmids were stably maintained in all new hosts except streptococcus sanguis, streptococcus pneumoniae, staphylococcus aureus, and listeria innocua and were identical to those found in the corresponding donor strains. | 1984 | 6712204 |
| infection caused by vancomycin-resistant streptococcus sanguis ii. | a patient with bacteremia caused by vancomycin-resistant streptococcus sanguis ii is presented. this rare occurrence suggests that vancomycin may not be a completely reliable antibiotic in the treatment of infections due to viridans species of the genus streptococcus. gram-positive isolates from blood and otherwise sterile body fluids should be tested for susceptibility to vancomycin. | 1984 | 6732222 |
| growth of oral streptococcus species and actinomyces viscosus in human saliva. | microorganisms in dental plaque live in constant association with saliva. the role of saliva in the adherence of bacteria to the teeth and the antibacterial properties of saliva have been well investigated; less interest has been shown in the possible role of saliva as a substrate for oral microorganisms. in this study it was shown that saliva can serve as a growth medium for oral streptococcus spp. and actinomyces viscosus. the cell production of these organisms on saliva was carbohydrate limit ... | 1984 | 6742834 |
| [distribution of streptococcus, s. mutans and s. sanguis in the human oral cavity]. | 1983 | 6589057 | |
| specific binding ability of the cells of streptococcus sanguis atcc 10557 to beta-d-galactopyranoside-bovine serum albumin conjugate. | 1983 | 6374077 | |
| nonspecific induction of immunoglobulin m antibodies to periodontal disease-associated microorganisms after polyclonal human b-lymphocyte activation by fusobacterium nucleatum. | the production of antibodies to oral bacteria was determined in lymphocyte cultures stimulated with sonicated fusobacterium nucleatum, a potent inducer of polyclonal b-cell activation. after 9 days the cultures were examined by a microenzyme-linked immunosorbent assay for immunoglobulin m (igm) antibodies to f. nucleatum, bacteroides gingivalis, actinomyces viscosus, and streptococcus sanguis. antibodies to these four bacteria were detected in cultures stimulated with polyclonal b-cell activatio ... | 1983 | 6604024 |
| the binding of human salivary alpha-amylase by oral strains of streptococcal bacteria. | the ability of various oral streptococci to bind salivary alpha-amylase to their cell surfaces was investigated. samples of cells were mixed with whole cleared saliva and the alpha-amylase remaining after removal of the cells was assayed by radial diffusion in starch-containing agarose. seventy-five per cent of streptococcus sanguis strains bound the enzyme but strains of streptococcus mutans and streptococcus mitior did not. sds-polyacrylamide gel electrophoretic analysis of strep. sanguis cell ... | 1983 | 6605739 |
| copper-inhibition of the growth of oral streptococci and actinomyces. | copper ions were found to inhibit the rate of growth in broth culture of streptococcus mitis, streptococcus mutans, streptococcus salivarious, streptococcus sanguis, actinomyces viscosus and actinomyces naeslundii. in all cases, 10(-3) m copper inhibited the rate of growth, whereas 10(-4) m and lower concentrations had little or no effect. at the concentrations used in mouthwashes one mode of action of copper ions is to reduce the rate of growth of oral bacteria in vitro. | 1983 | 6615987 |
| phosphoenolpyruvate-dependent phosphorylation of alpha-methylglucoside in streptococcus sanguis atcc 10556. | spontaneous mutants defective in some undefined membrane components of the phosphoenolpyruvate:glucose phosphotransferase system were isolated by plating cells of streptococcus sanguis atcc 10556 onto an agar containing lactose and 10 mm 2-deoxyglucose. toluenized cells of these mutants were defective in their ability to catalyse the phosphoenolpyruvate-dependent phosphorylation of 2-deoxyglucose but were still able to phosphorylate alpha-methylglucoside. the phosphorylation of alpha-methylgluco ... | 1983 | 6616345 |
| cell-free released components of streptococcus sanguis inhibit human platelet aggregation. | to study the role of surface components in the selective binding and aggregation of platelet-rich plasma (prp) by strains of viridans streptococci, we treated the binding, aggregation strain streptococcus sanguis i 2017-78 by sonication or trypsinization. morphologically identifiable electron-dense fibrils were released from the cell wall, apparently from an inner electron-dense layer, under conditions that left cells intact. these controlled conditions were determined to cause submaximal loss i ... | 1983 | 6618669 |
| local anesthetics block transient expression of inducible functions for transformation in streptococcus sanguis. | procaine and tetracaine reversibly inhibit transformation by preventing the transient expression of competence-specific, inducible functions, which are usually triggered in response to cellular stimulation with competence protein. affinity studies with 14c-labeled procaine showed that the anesthetic bound to cell surface macromolecules specifically in the initiation phases of competence-specific events and blocked transfer of information imparted by cellular membrane receptor(s) upon interaction ... | 1983 | 6619099 |
| a neuraminidase from streptococcus sanguis that can release o-acetylated sialic acids. | the naturally occurring sialic acids can have different types of n- and o-substitutions, resulting in more than 20 known isomers and compounds. most methods for the detailed study of these various sialic acids require that the molecules be first released from their alpha-glycosidic linkage. when mild acid hydrolysis is used for this purpose, significant destruction of o-substituent groups occur. on the other hand, the presence of o-substituent groups renders the sialic acid molecule partially or ... | 1983 | 6630194 |
| bacteriology of dental abscesses of endodontic origin. | aspirates have been cultured from 10 dental abscesses of endodontic origin, all of which had penetrated beyond the bony alveolus to produce fluctuant swelling. sampling was by syringe aspiration. strict anaerobic techniques, including the use of an anaerobic chamber, were used for serial dilution and plating. randomly selected colonies (100) from each culture were purified, characterized, and identified. seventy percent of the bacterial isolates were either strict anaerobes or microaerophilic. o ... | 1983 | 6630460 |
| distribution and incidence of viridans streptococcal species in routine clinical specimens. | five hundred consecutive isolates of viridans streptococci were identified to the species level in an effort to determine their distribution and incidence in routine clinical specimens. viridans streptococci accounted for significant percentages of streptococcal isolates from urine, wounds, body fluids, and blood. the most commonly isolated strains belonged to the streptococcus milleri, streptococcus mitis, streptococcus sanguis i, and streptococcus sanguis ii species. patient charts were review ... | 1983 | 6637890 |
| association of neuraminidase-sensitive receptors and putative hydrophobic interactions with high-affinity binding sites for streptococcus sanguis c5 in salivary pellicles. | the relationship of neuraminidase-sensitive receptors and putative hydrophobic interactions to high- and low-affinity binding sites in experimental salivary pellicles for streptococcus sanguis c5 was investigated. nascn, an inhibitor of hydrophobic interactions, reduced the number of cells which adsorbed to pellicles to a greater extent than nacl or kcl when both low and high streptococcal concentrations were used in assays. however, nascn was not more effective than nacl or kcl in desorbing 3h- ... | 1983 | 6642656 |
| role of monocytes in polyclonal immunoglobulin production stimulated by sonicates of periodontally associated bacteria. | these studies were initiated to investigate monocyte regulation of polyclonal antibody responses of human peripheral blood lymphocytes stimulated by sonicates of periodontally associated bacteria. with pokeweed mitogen (pwm) as a positive reference, the role of monocytes in the peripheral blood lymphocyte response to streptococcus sanguis and wolinella hvs was examined by manipulating the number of monocytes and lymphocytes in culture. in comparison to pwm, optimal responses to the bacterial son ... | 1983 | 6642667 |
| spontaneous bacterial peritonitis caused by a viridans streptococcus or neisseria perflava. | eight patients had nine episodes of presumed spontaneous bacterial peritonitis (sbp) caused by commensal bacteria that usually inhabit the oropharynx, including neisseria perflava and the viridans streptococci streptococcus milleri, streptococcus mitis, and streptococcus sanguis. nonpurulent ascites (ascitic fluid wbc count, less than 1,000/cu mm) was present in four episodes, possibly caused by either bacterial colonization or early peritonitis; purulent ascites was present in five episodes. no ... | 1983 | 6645030 |
| plaque formation on the hydrophobic composite resin. | 1983 | 6586351 | |
| [studies on materials for root caries restoration--adherence of plaque bacteria on the materials' surface]. | 1983 | 6586887 | |
| exohemagglutinin isolated from the cultured medium of streptococcus sanguis atcc 10557. | 1983 | 6587050 | |
| concentration-dependent multiple binding sites on saliva-treated hydroxyapatite for streptococcus sanguis. | the influence of bacterial cell concentration on estimates of the number of binding sites and the affinity for the adsorption of a strain of streptococcus sanguis to saliva-treated hydroxyapatite was determined, and the possible presence of multiple binding sites for this organism was tested. the range of concentrations of available bacteria varied from 4.7 x 10(6) to 5,960 x 10(6) cells per ml. the numbers of adsorbed bacteria increased over the entire range tested, but a suggestion of a break ... | 1983 | 6822416 |
| influence of growth conditions on adherence of streptococcus mutans ingbritt to saliva-coated hydroxyapatite. | streptococcus mutans ingbritt grown under standardized conditions adhered less effectively to saliva-coated hydroxyapatite beads than did streptococcus sanguis g9b, and there was competition for binding. the results with ingbritt were influenced by the generation time, the ph of growth, and the carbohydrate source as shown by studies on organisms grown in continuous culture. | 1983 | 6822425 |
| effect of penicillin on the adherence of streptococcus sanguis in vitro and in the rabbit model of endocarditis. | the effect of penicillin treatment of streptococcus sanguis in vitro, on subsequent bacterial density in the bloodstream and on cardiac valves in the rabbit model of endocarditis was studied. as experimental tools for this study, isogenic pairs of s. sanguis differing in resistance to streptomycin or rifampin were prepared by genetic transformation. rabbits with traumatized heart valves received an intravenous inoculation of penicillin treated (1 mug/ml) and untreated s. sanguis, each marked by ... | 1983 | 6826729 |
| penicillin therapy of experimental endocarditis induced by tolerant streptococcus sanguis and nontolerant streptococcus mitis. | the response of tolerant streptococcus sanguis and nontolerant streptococcus mitis infections to penicillin therapy was compared in the rabbit model of endocarditis. the minimal inhibitory and bactericidal concentrations of penicillin were 0.1 and 0.1 mug/ml, respectively, for s. mitis and 0.05 and 6.2 mug/ml, respectively, for s. sanguis. time-kill studies done in vitro with penicillin concentrations of 2 and 20 mug/ml demonstrated minimal killing of the tolerant strain, with a 3 log difference ... | 1983 | 6830210 |
| production, purification, and properties of a bacteriocin from staphylococcus aureus isolated from saliva. | staphylococci from samples of human saliva were isolated on staphylococcal-selective agar plates. these strains were tested for the inhibition of the growth of staphylococcus aureus fda209p. the frequency of inhibitory strains among all of the staphylococcal isolates was 5.2%. strain iys2, which formed the biggest inhibitory zone against the growth of the indicator strain, was used as the producer of bacteriocin. iys2 was identified to be s. aureus, based on its biological properties. the bacter ... | 1983 | 6832811 |
| hydrophobicity and adherence of oral streptococci after repeated subculture in vitro. | fresh isolates of streptococcus mutans, streptococcus sanguis, and streptococcus salivarius from human dental plaque were all highly hydrophobic. after repeated subculture in vitro on blood agar, strains of s. mutans serotype c showed decreased hydrophobicity, whereas serotype d/g strains did not. parallel to the decreased hydrophobicity in the serotype c strains, an impaired ability to adhere to hydroxyapatite was observed. a similar but less pronounced decrease in hydrophobicity in one s. sang ... | 1983 | 6832836 |
| hydrogen peroxide excretion by oral streptococci and effect of lactoperoxidase-thiocyanate-hydrogen peroxide. | approved type strains of streptococcus sanguis, s. mitis, s. mutans, and s. salivarius were grown under aerobic and anaerobic conditions. the rate of hydrogen peroxide excretion, oxygen uptake, and acid production from glucose by washed-cell suspensions of these strains were studied, and the levels of enzymes in cell-free extracts which reduced oxygen, hydrogen peroxide, or hypothiocyanite (oscn-) in the presence of nadh or nadph were assayed. the effects of lactoperoxidase-thiocyanate-hydrogen ... | 1983 | 6832837 |
| successful single-dose amoxicillin prophylaxis against experimental streptococcal endocarditis: evidence for two mechanisms of protection. | amoxicillin prophylaxis against experimental endocarditis due to one nontolerant and two tolerant strains of streptococci was studied in rats. single-dose amoxicillin protected against the two tolerant strains in animals challenged with the 90% infective dose (id90), but protection diminished with increasing inoculum sizes. protection against the nontolerant strain was successful with inocula that were 100- and 1,000-fold larger than the id90. close correlation existed between the speed of bacte ... | 1983 | 6833800 |
| therapeutic significance of penicillin tolerance in experimental streptococcal endocarditis. | tolerance to penicillin exists among the viridans group of streptococci, but its therapeutic significance is unknown. we studied the effect of penicillin alone and in combination with streptomycin, in vivo and in vitro, on three strains of dextran-producing streptococcus sanguis serotype ii which possess widely various degrees of penicillin tolerance. in rabbits with experimental endocarditis, treatment with procaine penicillin (250 mg/kg intramuscularly twice daily for 5 days) decreased the num ... | 1983 | 6838188 |
| iga1 half molecules in human multiple myeloma and the in vitro production of similar fragments from intact iga1 molecules. | this paper describes an iga related protein vla which occurred in the serum and urine of a patient with multiple myeloma. the protein was isolated from urine; it had a molecular mass of 70,000 daltons. it was shown to be a two chain iga half molecule, consisting of a deleted alpha heavy chain, with a molecular mass of 42,000 daltons, which was disulphide linked to a normal kappa type light chain. fabc fragments were produced from an unrelated myeloma iga. these had the same biochemical propertie ... | 1983 | 6839548 |
| purification and properties of pyruvate kinase from streptococcus sanguis and activator specificity of pyruvate kinase from oral streptococci. | it was found that pyruvate kinases with two different regulatory characteristics were distributed among oral streptococci. the pyruvate kinases of streptococcus mutans, streptococcus salivarius, and streptococcus bovis were activated by glucose 6-phosphate, whereas the enzymes of both streptococcus sanguis and streptococcus mitis were activated by fructose 1,6-bisphosphate. pyruvate kinase (ec 2.7.1.40) from s. sanguis nctc 10904 was purified, giving a single band on sodium dodecyl sulfate-polya ... | 1983 | 6840832 |
| cysteine toxicity for oral streptococci and effect of branched-chain amino acids. | cysteine was bactericidal to strains of streptococcus mutans and s. salivarius in concentrations that were nontoxic to s. sanguis, s. milleri, or s. mitior when these microorganisms were incubated in a saliva protein-based synthetic medium. cysteine toxicity for s. mutans also occurred after incubation in synthetic base medium supplemented with amino acids as the nitrogen source for growth. the bactericidal effect of cysteine for s. mutans or s. salivarius in the saliva protein medium was influe ... | 1983 | 6840837 |
| in vitro antiplaque activity of octenidine dihydrochloride (win 41464-2) against preformed plaques of selected oral plaque-forming microorganisms. | the antibacterial activity of octenidine dihydrochloride (win 41464-2) against intact preformed in vitro plaques of four indigenous oral plaque-forming microorganisms, streptococcus mutans, streptococcus sanguis, actinomyces viscosus, and actinomyces naeslundii, was studied. both absolute (plaque bactericidal index) and relative (chlorhexidine coefficient) indices of antiplaque efficacy were established. octenidine dihydrochloride compared favorably with chlorhexidine digluconate with respect to ... | 1983 | 6847170 |
| common antigens of streptococcal and nonstreptococcal oral bacteria: characterization of wall-associated protein and comparison with extracellular protein antigen. | a soluble wall-associated common protein (wap) has been isolated from cell wall-extracted antigens of exponentially growing cells of streptococcus sanguis omz9, two serotypes (a and e), of streptococcus mutans and actinomyces viscosus omz104. the wap antigens from the different strains were obtained by chromatography on an anti-rabbit immunoglobulin column of sodium dodecyl sulfate-dissociated immunoprecipitates. the affinity-isolated wap antigens from the different oral bacteria were identical, ... | 1983 | 6852918 |
| modulation of bacterial aggregation by pmn and platelet extracts. | human parotid saliva contains agglutinins which bind to the surface of streptococci and induce the formation of bacterial aggregates. bacterial aggregation can be blocked by proteins released from viable pmns and platelets or by sonic extracts prepared from these cells. pmn and platelet inhibitors display characteristic differences in molecular weight, protease, and temperature sensitivity. the mechanism of action of the inhibitors appears to involve a direct interaction with the salivary agglut ... | 1983 | 6862591 |
| interaction of human plasma fibronectin with cariogenic and non-cariogenic oral streptococci. | the interaction of purified human plasma fibronectin (fn) with bacteria was studied with a variety of oral streptococci. each of the strains of streptococcus mutans, streptococcus salivarius, streptococcus sanguis, and streptococcus mitis tested was aggregated by fn to various degrees, depending on the concentration of fn added to the test mixtures. binding assays performed with radiolabeled fn and various strains of streptococci demonstrated various capabilities to bind fn, and the amount of fn ... | 1983 | 6862625 |
| purification and characterization of neutrophil chemotactic factors of streptococcus sanguis. | two neutrophil chemotactic factors were isolated from the culture filtrates of streptococcus sanguis atcc 10556 and were chemically characterized as n-terminal blocked peptides of low molecular weight. one of the factors consisted of proline, valine, methionine, isoleucine and leucine and the other of methionine, isoleucine, leucine and phenylalanine. in both factors, methionine was detected as the sole n-terminal amino acid, but the amino group was blocked. the removal of n-terminal methionine ... | 1983 | 6871247 |
| neuraminidase production by a streptococcus sanguis strain associated with subacute bacterial endocarditis. | the properties of an extracellular neuraminidase produced by a streptococcus sanguis strain (isolated from a confirmed case of subacute bacterial endocarditis) during growth in a defined medium was examined in this investigation. this enzyme, isolated from concentrated culture supernatants of s. sanguis biotype ii, was active against human alpha-1 acid glycoprotein, n-acetylneuramin lactose, bovine submaxillary mucin, and fetuin. neuraminidase production paralleled bacterial growth in defined me ... | 1983 | 6874067 |
| structural preferences of beta-galactoside-reactive lectins on actinomyces viscosus t14v and actinomyces naeslundii wvu45. | specificities of lectins on actinomyces viscosus t14v and actinomyces naeslundii wvu45 were compared by measuring the abilities of d-galactose, n-acetyl-d-galactosamine, 14 beta-d-galacto-oligosaccharides, and 2 beta-d-fuco-oligosaccharides to inhibit coaggregation between streptococcus sanguis 34 and each actinomycete. inhibition profiles were similar, but wvu45 was significantly more sensitive to several inhibitors. d-galactose-beta(1 leads to 3)-n-acetyl-d-galactosamine glycosides were most p ... | 1983 | 6874075 |
| specific coaggregation and the cell wall of streptococcus sanguis. | sacculi prepared from streptococcus sanguis 34 by extensive extraction of cells with hot sodium dodecyl sulfate-2-mercaptoethanol retained the ability to coaggregate with actinomyces viscosus t14v. when s. sanguis 34 was disrupted by homogenization with glass beads and fractionated by differential centrifugation, only the cell wall fraction agglutinated a. viscosus t14v. when strain 34 was treated with lysozyme, the coaggregating capability of the cells was essentially unaltered. sacculi prepare ... | 1983 | 6874647 |
| genetic transformation in streptococcus sanguis. kinetics of production in different media and specific interaction of competence factor and competence factor inactivator. | the production and the persistence of competence factor (cf) and competence factor inactivator (cfi) of four different strains of streptococcus sanguis in three media (todd hewitt broth, medium ii and medium iv) have been examined with respect to kinetics. both the medium used and the strains examined offered implications on the activities of cf and cfi. cf was not detectable in the culture filtrates of strains wicky (nctc 9124) and 445. strain blackburn (nctc 10231) showed activity only in todd ... | 1983 | 6880744 |
| comparative hydrophobicities of oral bacteria and their adherence to salivary pellicles. | oral bacteria were found to differ in their surface hydrophobicities as determined by their ability to adsorb to hexadecane. strains of actinomyces viscosus, a. naeslundii, streptococcus sanguis, s. mitis, and bacteroides gingivalis proved highly hydrophobic. strains of b. intermedius, s. salivarius, s. mutans, and b. melaninogenicus were less hydrophobic, whereas strains of actinobacillus actinomycetemcomitans were hydrophilic. an overall correlation was noted between the adsorption of bacteria ... | 1983 | 6885158 |
| significance of penicillin tolerance in vivo: prevention of experimental streptococcus sanguis endocarditis. | to determine whether in-vitro tolerance to penicillin among viridans streptococci influences the efficacy of penicillin in vivo, we studied four strains of dextran-producing. streptococcus sanguis serotype ii. all four strains were inhibited in vitro by 0.1 mg/l penicillin or less; one was not-tolerant, one intermediate, and two were tolerant to the lethal action of penicillin. the combination of penicillin and streptomycin killed all strains completely within 24 h in vitro. sera from rabbits in ... | 1983 | 6885680 |
| resistance in oral streptococci after repeated two-dose amoxycillin prophylaxis. | twelve normal volunteers received two doses of 3 g amoxycillin at weekly intervals on up to five occasions. amoxycillin-resistant oral streptococci were not isolated from any subject beforehand, but they had appeared in all eleven subjects (who could be included in the analysis) by the end of the investigation, and in one subject after one administration of double dose amoxycillin. resistant streptococci were undetectable in all volunteers 13 weeks after their last dose of amoxycillin. all resis ... | 1983 | 6555190 |
| the antibacterial effects of calcium hydroxide apexification pastes on streptococcus sanguis. | four calcium hydroxide-based apexification pastes were tested for their antibacterial effects on streptococcus sanguis. their zones of growth inhibition on blood agar plates were measured at 2, 4, 6, and 8 days. only the camphorated parachlorophenol and the metacresylacetate pastes showed zones of inhibition. both of these zones of inhibition decreased with time; however, the zones of inhibition for the parachlorophenol paste decreased at a slower rate. | 1983 | 6572354 |
| purification and characterization of galactosephilic component present on the cell surfaces of streptococcus sanguis atcc 10557. | previous studies have indicated that a galactosephilic component present on the bacterial cell surfaces of streptococcus sanguis atcc 10557 may be responsible for the salivary glycoprotein-mediated binding of the cells. the purpose of this study was to investigate the purification and characterization of galactosephilic cell surface component from s. sanguis atcc 10557. a galactosephilic component involving fibrils on the cell surfaces was isolated by the techniques of freezing and thawing, and ... | 1983 | 6573474 |
| effect of snf2, administered as mouthrinses or topically applied, on streptococcus mutans, streptococcus sanguis and lactobacilli in dental plaque and saliva. | mouthrinsing with snf2 reduced the streptococcus mutans population in plaque and saliva and the proportion of streptococcus sanguis in plaque. the effect was of short duration: 2 weeks after treatment the values of s. mutans in plaque and saliva were even higher than the pretreatment values. topical snf2 applications reduced the s. mutants population in plaque and saliva but did not reduce the proportion of s. sanguis in plaque. the effect was more prolonged : 4 weeks after treatment the s. muta ... | 1983 | 6574579 |
| inhibition by the antimicrobial agent chlorhexidine of acid production and sugar transport in oral streptococcal bacteria. | oral streptococci transport sugars via the phosphoenolpyruvate-phosphotransferase (pep-pts) system. in a specific assay of this system, low concentrations of chlorhexidine abolished the activity of the glucose and sucrose pts in batch-grown cells of streptococcus mutans ingbritt and b13, strep. sanguis nctc 7865, strep. mitis atcc 903, strep. milleri nctc 10709 and strep. salivarius nctc 8606. intact cells and cells made permeable to the assay reagents with toluene were used. toluenized cells we ... | 1983 | 6574734 |
| control of sugar utilization in the oral bacteria streptococcus salivarius and streptococcus sanguis by the phosphoenolpyruvate: glucose phosphotransferase system. | three different strep. salivarius (g2, g5 and g29) and two strep. sanguis (gs3 and gs12) mutants affected in the phosphoenolpyruvate: glucose phosphotransferase system were selected on agar plates containing lactose and 2-deoxyglucose. all 5 were defective in a membrane-bound component of the transport system and grew less rapidly than the parent strain in 5 mm glucose-containing medium. mutants g2 and g29 grew poorly in the presence of 5 mm mannose. growth on mixed substrates revealed that the ... | 1983 | 6575744 |
| comparative growth responses of oral streptococci on mixed saliva or the separate submandibular and parotid secretions from caries-active and caries-free individuals. | growth of s. mutans on mixed or parotid saliva from cf individuals may be influenced by the availability of growth-supportive proteins or the inhibitory activity present in parotid saliva. a deficiency in growth-supportive proteins may explain the limited growth of s. sanguis on mixed or submandibular saliva from these individuals. | 1983 | 6575997 |
| prophylaxis of experimental endocarditis in rabbits using one or two doses of amoxycillin. | 1983 | 6577902 | |
| the survivability of f43 strain of streptococcus sanguis in root canals filled with gutta-percha and procosol cement. | 1983 | 6579164 | |
| [purification and characterization of the lectin present on the cell surfaces of streptococcus sanguis atcc 10557]. | 1983 | 6579272 | |
| association of food lectins with human oral epithelial cells in vivo. | the association of wheat germ agglutinin (wga) and peanut agglutinin (pna) with oral tissues after eating raw wheat-germ or raw peanuts, respectively, was determined. an indirect enzyme-linked immunoassay (elia) was used to detect wga and pna on epithelial cells. buccal and tongue epithelial cells, and preparations of salivary sediment exhibited elia units of wga and pna significantly above background after eating 2--7 g of wheat-germ or 25 g of raw peanuts, respectively. both lectins were detec ... | 1983 | 6579890 |
| predominant cultivable microflora of plaque on removable dentures in patients with healthy oral mucosa. | plaque from the fitting surface of upper full dentures in eight patients with healthy palatal mucosa was studied. to characterize the predominant cultivable flora, 916 isolates (100-128 from each sample) were subcultured from anaerobic roll-tubes. streptococci constituted 0-81 per cent (median, 41 per cent) of the isolates with varying proportions of streptococcus milleri, streptoccus mutans, streptococcus salivarius, streptococcus mitior and streptococcus sanguis. staphylococcus aureus made up ... | 1983 | 6579900 |
| implantation of transformant strains of the bacterium streptococcus sanguis into adult human mouths. | streptococcus sanguis strains isolated from dental plaque of 12 subjects were screened for their ability to undergo genetic transformation using a streptomycin-resistance marker. all subjects harboured at least one transformable strain. eight of the subjects were implanted with transformant strains originally isolated from their own mouth, whereas four subjects received bacteria from other donors. the strep. sanguis transformants became successfully implanted; their oral levels remained virtuall ... | 1983 | 6579905 |
| stability of streptococcus mutans and its relationship to caries in a child population over 2 years. | 1983 | 6580079 | |
| heterofermentative glucose metabolism by glucose transport-impaired mutants of oral streptococcal bacteria during growth in batch culture. | spontaneous mutants defective in a membrane component of the phosphoenolpyruvate-glucose phosphotransferase system were isolated by plating cells of streptococcus sanguis 10556, streptococcus mutans gs5-2 and nctc 10449 on agar containing lactose and 2-deoxyglucose. toluenized cells of these mutants were defective in their ability to catalyse the phosphoenolpyruvate-dependent phosphorylation of 2-deoxyglucose. the parental strains were mainly homofermentative when grown in batch culture in the p ... | 1983 | 6580849 |
| [bacterial flora in dental intercoronal fissures based on a literature review]. | 1983 | 6581900 | |
| a complex attenuator regulates inducible resistance to macrolides, lincosamides, and streptogramin type b antibiotics in streptococcus sanguis. | macrolide-lincosamide-streptogramin b resistance specified by streptococcus sanguis plasmid pam77 involves an adenine methylase, whose synthesis, demonstrable both phenotypically and by analysis of methionine-labeled proteins made in bacillus subtilis minicells, is inducible by erythromycin, lincomycin, and streptogramin type b antibiotics. localization of the methylase structural gene, including its control region in dna fragments obtained with restriction endonucleases, has been deduced from d ... | 1983 | 6406429 |
| [characterization of the antigen in circulating immune complexes and application to the detection of streptococcal antigens in human infectious endocarditis]. | immune complexes from patients with subacute endocarditis were used to develop a methodology for characterization of the antigen involved in human circulating immune complexes. this model was chosen because it permits isolation of the causative agent of the streptococcal infection thought to contain the antigen present in the immune complex. a comparison was made between two methods for characterization of bacterial antigen bound to antibody. in the first, animals were immunized with purified im ... | 1983 | 6408976 |
| prevalence of viridans streptococci exhibiting lactose-inhibitable coaggregation with oral actinomycetes. | fresh oral isolates from human dental plaque were selected on the basis of their spherical morphology. in a double-blind experiment, their species identity and ability to coaggregate with human oral actinomyces viscosus and actinomyces naeslundii were determined. of the 110 isolates characterized, 30 were identified as either streptococcus mutans, streptococcus anginosus-constellatus, or veillonella parvula; none of these coaggregated with the actinomycetes. the remaining 80 isolates were identi ... | 1983 | 6409806 |
| new actinomyces and streptococcus coaggregation groups among human oral isolates from the same site. | the coaggregation properties of recent human oral streptococcal and actinomyces isolates from the same site were determined and compared with the coaggregation properties of well-characterized stock strains of these two kinds of bacteria. streptococcus sanguis, actinomyces viscosus, actinomyces naeslundii, and phenotypically similar strains of actinomyces were isolated from subgingival samples from periodontally healthy older individuals, from persons participating in an experimental gingivitis ... | 1983 | 6409807 |
| trimethylsilyl-sugar profiles of streptococcus milleri and streptococcus mitis. | seventy strains of 'viridans-group' streptococci were analysed gas chromatographically after preparation of trimethylsilyl ethers of their cellular sugars. the resulting profiles were evaluated as a possible aid to taxonomy. glycerol, glucose, galactose, n-acetyl-glucosamine and n-acetylmuramic acid were found in all strains, in varying amounts. rhamnose was the major neutral sugar in most strains, other than representatives of streptococcus mitis, which invariably had ribose and usually anhydro ... | 1983 | 6409876 |
| numerical taxonomy of streptococcus. | a numerical taxonomic study of strains of streptococcus, together with representatives of allied genera, showed 28 reasonably distinct phenons. the major areas, with their phenons, were: (a) enterococcal species group (s. faecalis, s. faecium, 's. avium' and a proposed new species 's. gallinarum'); (b) paraviridans species group (s. bovis, s. equinus, s. salivarius, 's. casseliflavus', s. mutans, s. raffinolactis and an unidentified oral group i); (c) lactic species group (s. lactis including s. ... | 1983 | 6409982 |
| streptococci isolated from the bloodstream and gingival crevice of man. | one hundred and twenty six strains of streptococci isolated from the bloodstreams of 123 hospital in-patients--55 with endocarditis--and 255 strains isolated from the gingival crevices of 66 volunteers were characterised. species isolated were streptococcus mitior, s. sanguis, undifferentiated viridans streptococci, s. salivarius, s. milleri, s. mutans, s. bovis and s. faecalis. there was no significant difference between the distribution of species in blood and in the gingival crevice. s. mitio ... | 1983 | 6410069 |
| purification and immunochemical characterization of streptococcus sanguis atcc 10557 serotype ii carbohydrate antigen. | cell wall carbohydrate antigen of streptococcus sanguis atcc 10557 (serotype ii/biotype b) was extracted from purified cell walls by treatment with 5% trichloroacetic acid at 4 degrees c for 8 h. the extract was purified by chromatography on deae-sephadex a-25 and sephadex g-100 columns. the purified carbohydrate antigen produced a single precipitin band against anti-type ii serum, which fused with the band produced by the autoclaved extract or the phenol-water extract of the s. sanguis cells. t ... | 1983 | 6417021 |
| inhibition of microbial iga proteases by human secretory iga and serum. | microbial iga proteases cleave human serum iga1 immunoglobulin, but human secretory iga is resistant to hydrolysis. we have found this resistance to be due to an inhibition of protease activity that is mediated by the fab region of secretory iga. the iga proteases of the genus neisseria are more sensitive to inhibition than is the protease of streptococcus sanguis. there is also a serum inhibitor of neisseria proteases that co-chromatographs with igg. monoclonal (myeloma) human igg proteins and ... | 1983 | 6417473 |
| [electrical potential of metal prostheses and metal restorative materials in the oral cavity]. | 1983 | 6387301 | |
| interference of alpha-hemolytic streptococci isolated from tonsillar surface on beta-hemolytic streptococci (streptococcus pyogenes)--a methodological study. | the interference between alpha-streptococcal strains obtained from patients with repeated tonsillitis and a collection of group a streptococcal strains were studied. for this purpose three in vitro methods were designed and compared. the results obtained by a simple plating technique suitable for screening purposes were found to correlate well with those using more laborious techniques. in a limited scale some of the alpha- and beta-streptococcal combinations were tested under in vivo conditions ... | 1983 | 6372328 |
| novel shuttle plasmid vehicles for escherichia-streptococcus transgeneric cloning. | a novel plasmid vector that is able to replicate both in escherichia coli and in streptococcus sanguis is described. this 9.2-kb plasmid, designated pva856, carries cmr, tcr, and emr determinants that are expressed in e. coli. only the emr determinant is expressed in s. sanguis. both the cmr and the tcr of pva856 may be insertionally inactivated. this plasmid affords several different cleavage-ligation strategies for cloning in e. coli followed by subsequent introduction of chimeras into s. sang ... | 1983 | 6319229 |
| application of a competition model to the growth of streptococcus mutans and streptococcus sanguis in binary continuous culture. | streptococcus mutans 6715-15 and streptococcus sanguis 10558 were grown together in continuous culture with glucose as the limiting carbon source. the relationship of growth rate to substrate concentration was determined for pure cultures of each organism in continuous and batch cultures. a model based on competition for a growth-limiting substrate (glucose) was used to predict the proportions of each organism when grown in binary cultures. the results indicate that interactions other than compe ... | 1983 | 6344790 |
| occurrence and nature of bacterial iga proteases. | 1983 | 6347000 |