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  1. Article ; Online: The discussion goes on: What is the role of Euryarchaeota in humans?

    Horz, H-P / Conrads, G

    Archaea (Vancouver, B.C.)

    2010  Volume 2010, Page(s) 967271

    Abstract: The human body (primarily the intestinal tract, the oral cavity, and the skin) harbours approximately 1,000 different bacterial species. However, the number of archaeal species known to colonize man seems to be confined to a handful of organisms within ... ...

    Abstract The human body (primarily the intestinal tract, the oral cavity, and the skin) harbours approximately 1,000 different bacterial species. However, the number of archaeal species known to colonize man seems to be confined to a handful of organisms within the class Euryarchaeota (including Methanobrevibacter smithii, M. oralis, and Methanosphaera stadtmanae). In contrast to this conspicuously low diversity of Archaea in humans their unique physiology in conjunction with the growing number of reports regarding their occurrence at sites of infection has made this issue an emerging field of study. While previous review articles in recent years have addressed the putative role of particularly methanogenic archaea for human health and disease, this paper compiles novel experimental data that have been reported since then. The aim of this paper is to inspire the scientific community of "Archaea experts" for those unique archaeal organisms that have successfully participated in the human-microbe coevolution.
    MeSH term(s) Archaea/classification ; Archaea/isolation & purification ; Archaea/pathogenicity ; Archaea/physiology ; Biodiversity ; Gastrointestinal Tract/microbiology ; Humans ; Metagenome ; Mouth/microbiology
    Language English
    Publishing date 2010-12-30
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 2133011-6
    ISSN 1472-3654 ; 1472-3646
    ISSN (online) 1472-3654
    ISSN 1472-3646
    DOI 10.1155/2010/967271
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  2. Article: Relationship between methanogenic archaea and subgingival microbial complexes in human periodontitis

    Horz, H.P / G. Conrads / K. Henne / M.E. Vianna / N. Robertz

    Anaerobe. 2015 Oct., v. 35

    2015  

    Abstract: We compared the amounts of methanogenic archaea with ten of the most important periodontal pathogens in 125 clinical samples. Correlation analysis suggests that the support of the periodontitis-associated bacterial consortium by methanogenic archaea may ... ...

    Abstract We compared the amounts of methanogenic archaea with ten of the most important periodontal pathogens in 125 clinical samples. Correlation analysis suggests that the support of the periodontitis-associated bacterial consortium by methanogenic archaea may be driven through direct or indirect interactions with Prevotella intermedia.
    Keywords Archaea ; correlation ; humans ; methanogens ; pathogens ; periodontitis ; Prevotella intermedia
    Language English
    Dates of publication 2015-10
    Size p. 10-12.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 1237621-8
    ISSN 1075-9964
    ISSN 1075-9964
    DOI 10.1016/j.anaerobe.2015.02.008
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 4318: Show issues Location:
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  3. Article ; Online: The Discussion Goes on

    H.-P. Horz / G. Conrads

    Archaea , Vol

    What Is the Role of Euryarchaeota in Humans?

    2010  Volume 2010

    Keywords Microbiology ; QR1-502 ; Science ; Q ; DOAJ:Microbiology ; DOAJ:Biology ; DOAJ:Biology and Life Sciences
    Language English
    Publishing date 2010-01-01T00:00:00Z
    Publisher Hindawi Publishing Corporation
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Relationship between methanogenic archaea and subgingival microbial complexes in human periodontitis.

    Horz, H P / Robertz, N / Vianna, M E / Henne, K / Conrads, G

    Anaerobe

    2015  Volume 35, Issue Pt A, Page(s) 10–12

    Abstract: We compared the amounts of methanogenic archaea with ten of the most important periodontal pathogens in 125 clinical samples. Correlation analysis suggests that the support of the periodontitis-associated bacterial consortium by methanogenic archaea may ... ...

    Abstract We compared the amounts of methanogenic archaea with ten of the most important periodontal pathogens in 125 clinical samples. Correlation analysis suggests that the support of the periodontitis-associated bacterial consortium by methanogenic archaea may be driven through direct or indirect interactions with Prevotella intermedia.
    MeSH term(s) Adult ; Aged ; Aged, 80 and over ; Archaea/classification ; Archaea/genetics ; Archaea/isolation & purification ; Archaea/metabolism ; Bacterial Infections/microbiology ; Biodiversity ; Female ; Humans ; Male ; Methane/metabolism ; Middle Aged ; Periodontitis/microbiology ; Prevotella intermedia/isolation & purification ; Prevotella intermedia/physiology
    Chemical Substances Methane (OP0UW79H66)
    Language English
    Publishing date 2015-10
    Publishing country England
    Document type Journal Article
    ZDB-ID 1237621-8
    ISSN 1095-8274 ; 1075-9964
    ISSN (online) 1095-8274
    ISSN 1075-9964
    DOI 10.1016/j.anaerobe.2015.02.008
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  5. Article: Distribution and persistence of probiotic Streptococcus salivarius K12 in the human oral cavity as determined by real-time quantitative polymerase chain reaction.

    Horz, H-P / Meinelt, A / Houben, B / Conrads, G

    Oral microbiology and immunology

    2007  Volume 22, Issue 2, Page(s) 126–130

    Abstract: The bacteriocin producer Streptococcus salivarius K12 is used as a probiotic targeting the oral cavity, so our study aimed to assess whether its dispersal and persistence could be monitored using real-time quantitative polymerase chain reaction. To this ... ...

    Abstract The bacteriocin producer Streptococcus salivarius K12 is used as a probiotic targeting the oral cavity, so our study aimed to assess whether its dispersal and persistence could be monitored using real-time quantitative polymerase chain reaction. To this end, we designed polymerase chain reaction primers and a hybridization probe specifically targeting salA, which encodes for the prepropeptide of salivaricin A. Using a single individual as our subject, we administered four lozenges of K12 Throat Guard per day over 3 days, then measured salA gene levels for 16 different oral sites at six different intervals over 35 days. Four samples each from gingival sulci and from teeth all remained negative. In contrast, in saliva and at all mucosal membranes K12 was detected, but with varying amounts and time profiles. Relatively high salA gene copy numbers, calibrated on the basis of colony-forming units, were seen on the tongue (maximum 4.6 x 10(4)/swab at day 4), in stimulated saliva (2.4 x 10(4)/ml, day 4) and on buccal membranes (1.3 x 10(4)/swab, day 8). K12 was present on both sides of the pharynx but asymmetrically in both quantity and duration. In conclusion, we have developed a real-time quantitative-polymerase chain reaction for counting S. salivarius K12 at various sites in the oral cavity. In the individual studied, K12 could be detected at the mucosal membranes for as long as 3 weeks, but with steadily decreasing numbers after day 8. Thus, K12 may have the potential to control oral bacterial infections only when the uptake is repeated frequently.
    MeSH term(s) Adult ; Bacterial Proteins/genetics ; Colony Count, Microbial ; DNA Primers ; DNA, Bacterial/analysis ; Halitosis/microbiology ; Humans ; Male ; Mouth Mucosa/microbiology ; Nucleic Acid Hybridization ; Pharyngitis/microbiology ; Pharynx/microbiology ; Polymerase Chain Reaction/methods ; Probiotics ; Saliva/microbiology ; Streptococcus/genetics ; Streptococcus/isolation & purification ; Time Factors
    Chemical Substances Bacterial Proteins ; DNA Primers ; DNA, Bacterial ; salivaricin A (150952-06-0)
    Language English
    Publishing date 2007-04
    Publishing country Denmark
    Document type Journal Article
    ZDB-ID 632970-6
    ISSN 1399-302X ; 0902-0055
    ISSN (online) 1399-302X
    ISSN 0902-0055
    DOI 10.1111/j.1399-302X.2007.00334.x
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 2199: Show issues Location:
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  6. Article ; Online: Comparative analysis of endodontic pathogens using checkerboard hybridization in relation to culture.

    Vianna, M E / Horz, H-P / Conrads, G / Feres, M / Gomes, B P F A

    Oral microbiology and immunology

    2008  Volume 23, Issue 4, Page(s) 282–290

    Abstract: Background/aim: The purpose of this study was to detect bacterial species and to quantify the total number of bacteria from samples of infected root canals before (S1) and after chemo-mechanical preparation using 2% chlorhexidine (CHX) gel as auxiliary ... ...

    Abstract Background/aim: The purpose of this study was to detect bacterial species and to quantify the total number of bacteria from samples of infected root canals before (S1) and after chemo-mechanical preparation using 2% chlorhexidine (CHX) gel as auxiliary chemical substance (S2) and after 7 days of intracanal dressing (S3) to compare microbial changes.
    Method: Twenty-four teeth were selected for this study. Chemo-mechanical preparation was performed using 2% CHX gel, then three different intracanal medicaments [M1: Ca(OH)(2) paste; M2: 2% CHX gel; and M3: Ca(OH)(2) paste plus 2% CHX gel] were used for 7 days. Checkerboard DNA-DNA hybridization was performed to detect 40 bacterial species. Aerobic and anaerobic culture techniques were used to determine the bacterial community by counting the colony-forming units (CFU).
    Results: The species most frequently identified by checkerboard in S1 were: Fusobacterium nucleatum ssp. polymorphum, Treponema socranskii ssp. socranskii, Parvimonas micra and Enterococcus faecalis. In S2 and S3 a total of eight different species were identified; and only one of them was gram-positive (E. faecalis). Microorganisms were not identified after use of M2 for 7 days. The quantification obtained on agar plates ranged from 4 x 10(5) to 2.6 x 10(6) CFU/ml in S1, mean CFU was reduced by 99.96% in S2, and there was no statistical difference between the CFU in S2 and S3.
    Conclusion: The antibacterial effect of the mechanical preparation supplemented by the use of an antibacterial auxiliary substance greatly reduced the microorganisms in the main root canal.
    MeSH term(s) Adolescent ; Adult ; Anti-Infective Agents, Local/administration & dosage ; Anti-Infective Agents, Local/therapeutic use ; Bacteria/classification ; Bacteria/genetics ; Calcium Hydroxide/administration & dosage ; Calcium Hydroxide/therapeutic use ; Campylobacter/classification ; Capnocytophaga/classification ; Chlorhexidine/administration & dosage ; Chlorhexidine/therapeutic use ; Colony Count, Microbial ; DNA, Bacterial/analysis ; Dental Pulp Cavity/microbiology ; Dental Pulp Necrosis/microbiology ; Dental Pulp Necrosis/therapy ; Drug Combinations ; Enterococcus faecalis/classification ; Eubacterium/classification ; Fusobacterium nucleatum/classification ; Humans ; Middle Aged ; Nucleic Acid Hybridization ; Periapical Periodontitis/microbiology ; Periapical Periodontitis/therapy ; Root Canal Irrigants/administration & dosage ; Root Canal Irrigants/therapeutic use ; Root Canal Preparation/methods ; Streptococcus/classification ; Treponema/classification
    Chemical Substances Anti-Infective Agents, Local ; DNA, Bacterial ; Drug Combinations ; Root Canal Irrigants ; Calcium Hydroxide (PF5DZW74VN) ; Chlorhexidine (R4KO0DY52L)
    Language English
    Publishing date 2008-08
    Publishing country Denmark
    Document type Comparative Study ; Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 632970-6
    ISSN 1399-302X ; 0902-0055
    ISSN (online) 1399-302X
    ISSN 0902-0055
    DOI 10.1111/j.1399-302X.2007.00425.x
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  7. Article: Detection of methanotroph diversity on roots of submerged rice plants by molecular retrieval of pmoA, mmoX, mxaF, and 16S rRNA and ribosomal DNA, including pmoA-based terminal restriction fragment length polymorphism profiling

    Horz, H.P / Yimga, M.T / Liesack, W

    Applied and environmental microbiology. Sept 2001. v. 67 (9)

    2001  

    Abstract: The diversity of methanotrophic bacteria associated with roots of submerged rice plants was assessed using cultivation-independent techniques. The research focused mainly on the retrieval of pmoA, which encodes the alpha subunit of the particulate ... ...

    Abstract The diversity of methanotrophic bacteria associated with roots of submerged rice plants was assessed using cultivation-independent techniques. The research focused mainly on the retrieval of pmoA, which encodes the alpha subunit of the particulate methane monooxygenase. A novel methanotroph-specific community-profiling method was established using the terminal restriction fragment length polymorphism (T-RFLP) technique. The T-RFLP profiles clearly revealed a more complex root-associated methanotrophic community than did banding patterns obtained by pmoA-based denaturing gradient gel electrophoresis. The comparison of pmoA-based T-RFLP profiles obtained from rice roots and bulk soil of flooded rice microcosms suggested that there was a substantially higher abundance of type I methanotrophs on rice roots than in the bulk soil. These were affiliated to the genera Methylomonas, Methylobacter, Methylococcus, and to a novel type I methanotroph sublineage. By contrast, type II methanotrophs of the Methylocystis-Methylosinus group could be detected with high relative signal intensity in both soil and root compartments. Phylogenetic treeing analyses and a set of substrate-diagnostic amino acid residues provided evidence that a novel pmoA lineage was detected. This branched distinctly from all currently known methanotrophs. To examine whether the retrieval of pmoA provided a complete view of root-associated methanotroph diversity, we also assessed the diversity detectable by recovery of genes coding for subunits of soluble methane monooxygenase (mmoX) and methanol dehydrogenase (mxaF). In addition, both 16S rRNA and 16S ribosomal DNA (rDNA) were retrieved using a PCR primer set specific to type I methanotrophs. The overall methanotroph diversity detected by recovery of mmoX, mxaF, and 16S rRNA and 16S rDNA corresponded well to the diversity detectable by retrieval of pmoA.
    Keywords Oryza sativa ; soil bacteria ; roots ; species diversity ; restriction fragment length polymorphism ; ribosomal RNA ; ribosomal DNA ; genes ; oxygenases ; rice soils ; rhizosphere ; nucleotide sequences ; electrophoresis ; rice ; flooded conditions ; denaturing gradient gel electrophoresis
    Language English
    Dates of publication 2001-09
    Size p. 4177-4185.
    Document type Article
    ZDB-ID 223011-2
    ISSN 1098-5336 ; 0099-2240
    ISSN (online) 1098-5336
    ISSN 0099-2240
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    In stock of ZB MED Bonn / Germany

    Z 2498: Show issues

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  8. Article ; Online: T-RFLP-based mcrA gene analysis of methanogenic archaea in association with oral infections and evidence of a novel Methanobrevibacter phylotype.

    Vianna, M E / Conrads, G / Gomes, B P F A / Horz, H P

    Oral microbiology and immunology

    2009  Volume 24, Issue 5, Page(s) 417–422

    Abstract: Introduction: Increasing evidence suggests a role for methanogenic archaea (methanogens) in human health and disease via syntrophic interactions with bacteria. Here we assessed the prevalence and distribution of methanogens and possible associations ... ...

    Abstract Introduction: Increasing evidence suggests a role for methanogenic archaea (methanogens) in human health and disease via syntrophic interactions with bacteria. Here we assessed the prevalence and distribution of methanogens and possible associations with bacteria in oral biofilms.
    Methods: Forty-four periodontal and 32 endodontic samples from necrotic teeth with radiographic evidence of apical periodontitis were analysed. Terminal restriction fragment length polymorphism analysis based on the mcrA gene, specific to methanogens, was applied. The prevalence and amounts of methanogens in endodontic samples were compared with those of Porphyromonas gingivalis, Prevotella intermedia, Tannerella forsythia, Treponema spp. and Synergistes spp. based on real-time quantitative polymerase chain reactions.
    Results: Besides dominance of the mcrA gene corresponding to Methanobrevibacter oralis, one mcrA gene type, for which no cultivated member has been reported previously, was identified in five periodontal samples and one endodontic sample. Rates of non-synonymous vs. synonymous nucleotide substitutions suggest that this mcrA gene type codes for a functionally active methyl-coenzyme M reductase. Methanobrevibacter smithii, the prominent methanogen in the human gut system, was not detected. Mean proportions of methanogens were comparable to Synergistes spp. ranging from 0.5 to 1.0% of the total microbial community. Treponema spp. dominated with a mean proportion of 10%, while the mean proportions of the other endodontic pathogens were below 0.1%. A positive association between methanogens and Synergistes spp. was found.
    Conclusion: Our data provide evidence of a novel, as yet uncultured methanogenic phylotype in association with oral infections, and indicate possible interactions between methanogens and Synergistes spp., the nature of which deserves further investigation.
    MeSH term(s) Bacteroides/isolation & purification ; Colony Count, Microbial ; Dental Plaque/microbiology ; Dental Pulp Cavity/microbiology ; Dental Pulp Necrosis/microbiology ; Deoxyribonuclease HpaII/genetics ; Deoxyribonucleases, Type II Site-Specific/genetics ; Gram-Negative Anaerobic Bacteria/isolation & purification ; Humans ; Methanobrevibacter/classification ; Methanobrevibacter/genetics ; Methanobrevibacter/isolation & purification ; Oxidoreductases/analysis ; Oxidoreductases/genetics ; Periapical Periodontitis/microbiology ; Periodontal Pocket/microbiology ; Phylogeny ; Polymorphism, Restriction Fragment Length/genetics ; Porphyromonas gingivalis/isolation & purification ; Prevotella intermedia/isolation & purification ; RNA, Ribosomal, 16S/genetics ; Reverse Transcriptase Polymerase Chain Reaction ; Treponema/isolation & purification
    Chemical Substances RNA, Ribosomal, 16S ; Oxidoreductases (EC 1.-) ; methyl coenzyme M reductase (EC 2.8.4.1) ; Deoxyribonuclease HpaII (EC 3.1.21.-) ; endodeoxyribonuclease AluI (EC 3.1.21.-) ; Deoxyribonucleases, Type II Site-Specific (EC 3.1.21.4)
    Language English
    Publishing date 2009-10
    Publishing country Denmark
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 632970-6
    ISSN 1399-302X ; 0902-0055
    ISSN (online) 1399-302X
    ISSN 0902-0055
    DOI 10.1111/j.1399-302X.2009.00539.x
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    Zs.A 2199: Show issues Location:
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  9. Article ; Online: SH3BP2-encoding exons involved in cherubism are not associated with central giant cell granuloma.

    Teixeira, R C / Horz, H P / Damante, J H / Garlet, G P / Santos, C F / Nogueira, R L M / Cavalcante, R B / Conrads, G

    International journal of oral and maxillofacial surgery

    2011  Volume 40, Issue 8, Page(s) 851–855

    Abstract: Central giant cell granuloma (CGCG) is a benign lesion with unpredictable biological behaviour ranging from a slow-growing asymptomatic swelling to an aggressive lesion associated with pain, bone and root resorption and also tooth displacement. The ... ...

    Abstract Central giant cell granuloma (CGCG) is a benign lesion with unpredictable biological behaviour ranging from a slow-growing asymptomatic swelling to an aggressive lesion associated with pain, bone and root resorption and also tooth displacement. The aetiology of the disease is unclear with controversies in the literature on whether it is mainly of reactional, inflammatory, infectious, neoplasic or genetic origin. To test the hypothesis that mutations in the SH3BP2 gene, as the principal cause of cherubism, are also responsible for, or at least associated with, giant cell lesions, 30 patients with CGCG were recruited for this study and subjected to analysis of germ line and/or somatic alterations. In the blood samples of nine patients, one codon alteration in exon 4 was found, but this alteration did not lead to changes at the amino acid level. In conclusion, if a primary genetic defect is the cause for CGCG it is either located in SH3BP2 gene exons not yet related to cherubism or in a different gene.
    MeSH term(s) Adaptor Proteins, Signal Transducing/genetics ; Adolescent ; Adult ; Cherubism/genetics ; Child ; Child, Preschool ; Codon/genetics ; Cytosine ; Exons/genetics ; Female ; Germ-Line Mutation/genetics ; Granuloma, Giant Cell/genetics ; Histidine/genetics ; Homozygote ; Humans ; Male ; Mandibular Diseases/genetics ; Maxillary Diseases/genetics ; Phenotype ; Polymerase Chain Reaction ; Sequence Analysis, DNA ; Thymine ; Young Adult
    Chemical Substances Adaptor Proteins, Signal Transducing ; Codon ; SH3BP2 protein, human ; Histidine (4QD397987E) ; Cytosine (8J337D1HZY) ; Thymine (QR26YLT7LT)
    Language English
    Publishing date 2011-08
    Publishing country Denmark
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 353721-3
    ISSN 1399-0020 ; 0901-5027
    ISSN (online) 1399-0020
    ISSN 0901-5027
    DOI 10.1016/j.ijom.2011.04.003
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    Zs.A 931: Show issues Location:
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  10. Article ; Online: Quantitative analysis of three hydrogenotrophic microbial groups, methanogenic archaea, sulfate-reducing bacteria, and acetogenic bacteria, within plaque biofilms associated with human periodontal disease.

    Vianna, M E / Holtgraewe, S / Seyfarth, I / Conrads, G / Horz, H P

    Journal of bacteriology

    2008  Volume 190, Issue 10, Page(s) 3779–3785

    Abstract: Human subgingival plaque biofilms are highly complex microbial ecosystems that may depend on H(2 ...

    Abstract Human subgingival plaque biofilms are highly complex microbial ecosystems that may depend on H(2)-metabolizing processes. Here we investigated the ubiquity and proportions of methanogenic archaea, sulfate reducers, and acetogens in plaque samples from 102 periodontitis patients. In contrast to the case for 65 healthy control subjects, hydrogenotrophic groups were almost consistently detected in periodontal pockets, with the proportions of methanogens and sulfate reducers being significantly elevated in severe cases. In addition, antagonistic interactions among the three microbial groups indicated that they may function as alternative syntrophic partners of secondary fermenting periodontal pathogens.
    MeSH term(s) Acetates/metabolism ; Acetobacter/genetics ; Acetobacter/physiology ; Biofilms/growth & development ; DNA, Bacterial/analysis ; Dental Plaque/microbiology ; Euryarchaeota/genetics ; Euryarchaeota/physiology ; Humans ; Hydrogen/metabolism ; Molecular Sequence Data ; Periodontal Diseases/microbiology ; Periodontal Pocket/microbiology ; Phylogeny ; Sulfates/metabolism ; Sulfur-Reducing Bacteria/genetics ; Sulfur-Reducing Bacteria/physiology
    Chemical Substances Acetates ; DNA, Bacterial ; Sulfates ; Hydrogen (7YNJ3PO35Z)
    Language English
    Publishing date 2008-03-07
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2968-3
    ISSN 1098-5530 ; 0021-9193
    ISSN (online) 1098-5530
    ISSN 0021-9193
    DOI 10.1128/JB.01861-07
    Database MEDical Literature Analysis and Retrieval System OnLINE

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