• 제목/요약/키워드: biofilm control

검색결과 173건 처리시간 0.024초

Periodontal health status, oral microbiome, white-spot lesions and oral health related to quality of life-clear aligners versus fixed appliances: A systematic review, meta-analysis and meta-regression

  • Ana Sandra Llera-Romero;Milagros Adobes-Martin;Jose Enrique Iranzo-Cortes;Jose Maria Montiel-Company;Daniele Garcovich
    • 대한치과교정학회지
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    • 제53권6호
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    • pp.374-392
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    • 2023
  • Objective: Assess and evaluate the different indicators of oral health-related quality of life (OHRQoL) among patients treated with clear aligners (CAs) versus those treated with conventional fixed orthodontics (FAs). Methods: An electronic search was performed on the database is Web of Science, Scopus, and Embase databases. Randomized and non-randomized control trials, cross-sectional, prospective cohort and retrospective trials were included. Quality was assessed with risk of bias tool and risk of bias in non-randomised studies. Meta-analyses were performed with random effects models, estimating the standardized and non-standardized mean differences, odds ratio and risk ratio as the measure of effect. The effect on time was determined using a meta-regression model. Results: Thirty one articles were included in the qualitative synthesis and 17 in the meta-analysis. CAs had a significantly lower negative impact on QoL, with an "important" effect size, while the influence of time was not significant. Periodontal indicators plaque index (PI), gingival index (GI), probing depth (PD), and bleeding on probing show significantly better values in patients treated with CAs, with moderate to large effect sizes. PI and GI have a significant tendency to improve over time. In microbiological indicators, CAs present a lower biofilm mass without differences in the percentage of patients with high counts of Streptococcus mutans and Lactobacilli bacteria. The risk of white spot lesion onset is ten times lower in carriers of CAs. Conclusions: Patients wearing CAs show better periodontal indicators, less risk of white spot development, less biofilm mass and a better QoL than patients with FAs.

항생제 노출에 따른 Klebsiella pneumoniae의 내성 특성 (Characteristics of Klebsiella pneumoniae exposed to serial antibiotic treatments)

  • 정래승;조아라;김정진;안주희
    • 미생물학회지
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    • 제52권4호
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    • pp.428-436
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    • 2016
  • 항균제에 대한 내성 증가는 국내뿐만 아니라 세계적으로도 인류 건강에 큰논란이 되고 있다. 박테리아에 의한 감염을 치료하기 위해 같은 혹은 다른 계열의 항생제에 순차적으로 노출된다. 따라서, 본 연구는 ciprofloxacin과 meropenem의 순차적 처리에 따른 폐렴간균(Klebsiella pneumoniae)의 생육, 항생제 민감성, 돌연변이 빈도, ${\beta}$-lactamase activity, 생물막 형성 및 내성 관련 유전자 발현을 평가하기 위해 설계되었다. 처리군은 대조군(control; CON), 1/2 MIC ciprofloxacin (1/2CIP), 2 MIC ciprofloxacin (2CIP), 1/2 MIC ciprofloxacin+1/2 MIC meropenem+2 MIC ciprofloxacin (1/2CIP-1/2MEM-2CIP), 1/2 MIC ciprofloxacin+1/2 MIC meropenem+2 MIC meropenem(1/2CIP-1/2MEM-2MEM), 1/2 MIC ciprofloxacin+2 MIC ciprofloxacin+2 MIC meropenem (1/2CIP-2CIP-2MEM)을 포함한다. 24시간의 배양 동안 2CIP처리군에서 K. pneumoniae의 생육이 관찰되지 않았다. 모든 처리군에서 planktonic cell의 수는 7에서 10 log CFU/ml의 유의적인 차이를 보였으나 biofilm cell의 수는 7 log CFU/ml로 비슷하였다. 돌연변이 빈도는 1/2CIP-1/2MEM-2CIP에서 가장 낮은 14%을 보였다. 대조군과 비교하여 1/2CIP-2CIP-2MEM 처리 K. pneumoniae는 piperacillin, cefotaxime, nalidixic에 대한 민감도가 감소되었다. 1/2CIP-1/2MEM-2CIPrk 가장 높은 ${\beta}$-lactamase activity(22 nmol/min/ml)을 보인 반면 1/2CIP-2CIP-2MEM은 가장 낮은 ${\beta}$-lactamase activity (6 nmol/min/ml)을 보였다. Multidrug efflux pump 관련 유전자(acrA, acrB, and ramA)의 발현은 1/2CIP-1/2MER-2MER and 1/2CIP2CIP-2MER 처리된 K. pneumoniae에서 2배 이상 증가하였다. 따라서 순차적 항생제의 처리는 K. pneumoniae의 항생제 내성 양상을 변화시킬 수 있다.

Biocontrol Traits and Antagonistic Potential of Bacillus amyloliquefaciens Strain NJZJSB3 Against Sclerotinia sclerotiorum, a Causal Agent of Canola Stem Rot

  • Wu, Yuncheng;Yuan, Jun;Raza, Waseem;Shen, Qirong;Huang, Qiwei
    • Journal of Microbiology and Biotechnology
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    • 제24권10호
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    • pp.1327-1336
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    • 2014
  • Bacillus amyloliquefaciens strain NJZJSB3 has shown antagonism of several phytopathogens in vitro, especially Sclerotinia sclerotiorum. Both the broth culture and cell suspension of strain NJZJSB3 could completely protect the detached leaves of canola (Brassica napus) from S. sclerotiorum infection. In pot experiments, the application of strain NJZJSB3 cell suspension ($10^8CFU/ml$) decreased the disease incidence by 83.3%, a result similar to commercially available fungicide (Dimetachlone). In order to investigate the potential biocontrol mechanisms of strain NJZJSB3, the nonvolatile antifungal compounds it produces were identified as iturin homologs using HPLC-ESI-MS. Antifungal volatile organic compounds were identified by gas chromatography-mass spectrometry. The detected volatiles toluene, phenol, and benzothiazole showed antifungal effects against S. sclerotiorum in chemical control experiments. Strain NJZJSB3 also produced biofilm, siderophores and cell-wall-degrading enzymes (protease and ${\beta}$-1,3-glucanase). These results suggest that strain NJZJSB3 can be a tremendous potential agent for the biological control of sclerotinia stem rot.

Reduction of biofouling using vanillin as a quorum sensing inhibitory agent in membrane bioreactors for wastewater treatment

  • Nam, AnNa;Kweon, JiHyang;Ryu, JunHee;Lade, Harshad;Lee, ChungHak
    • Membrane and Water Treatment
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    • 제6권3호
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    • pp.189-203
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    • 2015
  • Membrane biofouling impedes wide application of membrane bioreactor (MBR) for wastewater treatment. Recently, quorum sensing (QS) mechanisms are accounted for one of major mechanisms in biofouling of MBRs. In this study, vanillin was applied to investigate reduction of biofouling in MBRs. MBR sludge was analyzed to contain QS signal molecules by cross-feeding biosensor assay and HPLC. In addition, the inhibitory activity of vanillin against bacterial quorum sensing was verified using an indicator strain CV026. The vanillin doses greater than 125 mg/L to 100 mL of MBR sludge showed 25% reduction of biofilm formed on the membrane surfaces. Two MBRs, i.e., a typical MBR as a control and an MBR with vanillin, were operated. The TMP increases of the control MBR were more rapid compared to those of the MBR with the vanillin dose of 250 mg/L. The treatment efficiencies of the two MBRs on organic removal and MLSS were maintained relatively constant. Extracellular polymeric substance concentrations measured at the end of the MBR operation were 173 mg/g biocake for the control MBR and 119 mg/g biocake for the MBR with vanillin. Vanillin shows great potential as an anti-biofouling agent for MBRs without any interference on microbial activity for wastewater treatment.

Lactobacillus plantarum APsulloc 331261 발효 용해물의 피부 미생물 조절 효과 (Lactobacillus plantarum APsulloc 331261 Fermented Products as Potential Skin Microbial Modulation Cosmetic Ingredients)

  • 김한별;명길선;이현기;최은정;박태훈;안수선
    • 대한화장품학회지
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    • 제46권1호
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    • pp.23-29
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    • 2020
  • 피부에는 여러 종의 미생물들이 군집을 이루며 서식하고 있고, 서로 상호작용을 하며 균형을 유지하고 있다. 하지만, 여드름, 건선 및 아토피 피부염과 같은 질병 상태에서는 피부 미생물의 균형이 깨져 건강한 피부와는 다른 미생물 군집 구성을 보인다. 피부 미생물 군집 구성의 조절은 이러한 피부 질환에 대한 잠재적인 치료 방법이 될 수 있다. Quorum sensing (QS)은 세포간 전달인자로, QS을 조절하면 유해균의 바이오필름 형성이나 효소 분비등을 억제할 수 있고, 이 역시 피부 미생물 군집 구성에 영향을 준다. 이번 연구에서는 아모레퍼시픽의 특허 성분인 유산균 발효 용해물(Lactobacillus plantarum APsulloc 331261, KCCM 11179P 이용)의 QS억제능력 및 피부 유익균과 피부 유해균의 생장에 미치는 영향을 확인하였다. 유산균 발효 용해물 10 ㎍/mL 처리시, QS에 의해 제어되는 Chromobacterium violaceum의 자주색 안료 생산을 대조군 대비 27.4% 감소시켰다. 또 피부 유익균인 Staphylococcus epidermidis의 생장을 대조군 대비 12% 증가 시켰고, 피부 유해균인 Pseudomonas aeruginosa의 생장을 38.5% 감소, 바이오필름 형성을 17.7% 감소시켰다. S. epidermidis를 같은 속(genus)에 포함되어 있는 대표적인 피부 유해균 Staphylococcus aureus와 함께 공배양 하였을 때 S. epidermidis의 생장은 대조군 대비 134% 증가시켰고, S. aureus의 생장은 13% 억제시켰다. 이러한 결과들을 종합하였을 때 L. plantarum APsulloc 331261을 이용한 발효 용해물은 피부 미생물의 균형을 조절해 줄 수 있는 화장품 원료로 유용하게 사용 될 수 있다고 사료된다.

Nanoscale Fabrication of Biomolecular Layer and Its Application to Biodevices

  • Park, Jeong-Woo;Nam, Yun-Suk;Masamichi Fujihira
    • Biotechnology and Bioprocess Engineering:BBE
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    • 제9권2호
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    • pp.76-85
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    • 2004
  • Biodevices composed of biomolecular layer have been developed in various fields such as medical diagnosis, pharmaceutical screening, electronic device, photonic device, environmental pollution detection device, and etc. The biomolecules such as protein, DNA and pigment, and cells have been used to construct the biodevices such as biomolecular diode, biostorage device, bioelectroluminescence device, protein chip, DNA chip, and cell chip. Substantial interest has focused upon thin film fabrication or the formation of biomaterials mono- or multi-layers on the solid surfaces to construct the biodevices. Based on the development of nanotechnology, nanoscale fabrication technology for biofilm has been emerged and applied to biodevices due to the various advantages such as high density immobilization and orientation control of immoblized biomolecules. This review described the nanoscale fabrication of biomolecular film and its application to bioelectronic devices and biochips.

산성환경에서 S. mutans의 생육에 미치는 HtrA gene의 영향 (Role of HtrA in growth of Streptococcus mutans under acidic environment)

  • 강경희
    • 한국산학기술학회:학술대회논문집
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    • 한국산학기술학회 2009년도 추계학술발표논문집
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    • pp.498-500
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    • 2009
  • 본 연구에서는 한국인 아동의 우식치아로부터 분리한 S. mutans K7으로부터 HtrA gene을 동정하고 HtrA expression이 산성환경하에서 S. mutans의 생육에 미치는 영향을 알아보았다. S. mutans K7의 HtrA mutant strain은 산성환경에서 parental strain과 비교하였을 때, 생육에 있어서 상당한 차이를 나타내었다. 또한 Biofilm formation에 관여하는 GtfB, 와 GtfC의 발현량도 현저히 줄어들었다. 그리고 HtrA mutant strain에 HtrA gene을 삽입하여 HtrA의 발현량을 회복하였을 경우에는 acid stress하에서 control과 같은 nomal growth phenotype을 회복하였다. 이러한 결과들은 S. mutans K7에서 HtrA가 acid stress동안에 중요한 역할을 담당함을 제시하고 있다.

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임상가를 위한 특집 3 - 티타늄 임플란트의 항균코팅 동향 (An Overview of Research Trends in Antibacterial Coatings on Titanium Implants)

  • 김우현;김경남
    • 대한치과의사협회지
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    • 제48권2호
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    • pp.113-118
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    • 2010
  • Titanium and titanium alloys are the most common materials used for dental and biomedical implants, owing to their biocompatibility and favourable mechanical properties. However infection of the region surrounding a dental implant by pathogenic microorganisms is a significant factor in implant failure. Prevention and control of microbial colonization of implant surfaces is considerable interest to the biomedical community. One important strategy is to render the implant surface antibacterial by impeding the formation of biofilm. A number of approaches have been proposed for this purpose. Therefore, we reviewed the researches of antibacterial coatings on titanium implants in this articles.

치과용 유니트체어에 적용 가능한 수관 세척 제어시스템 구현 (Implemetation of Waterpipe Clean Control System for Dental Clinic Unit-chair)

  • 윤현수;박지현;정도운
    • 한국정보통신학회:학술대회논문집
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    • 한국해양정보통신학회 2011년도 춘계학술대회
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    • pp.760-761
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    • 2011
  • 본 연구에서는 치과용 유니트체어의 용수공급 시스템 중 수관 내부에 생성되는 바이오필름을 보다 효율적으로 제거하기위하여 공기와 물을 혼합한 버블을 생성하고 가변적인 압력을 인가하여 살균과 세척을 동시에 수행할 수 있는 시스템을 개발하고자 하였다. 이를 위하여 공기와 물의 혼합 세척을 통한 바이오필터 세척 및 전기분해를 이용한 용수 살균 시스템을 구현하였으며, 물과 공기의 흐름제어 및 가변적인 압력 조절 제어시스템을 구현하였다. 그리고 무선으로 제어가 가능한 솔레노이드밸브로 구성된 벨브조립체를 구성하여 세척모드 및 용수공급모드의 선택적 운용이 가능한 시스템을 구현하였다.

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Quorum Sensing and Quorum-Quenching Enzymes

  • Dong, Yi-Hu;Zhang, Lian-Hui
    • Journal of Microbiology
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    • 제43권spc1호
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    • pp.101-109
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    • 2005
  • To gain maximal benefit in a competitive environment, single-celled bacteria have adopted a community genetic regulatory mechanism, known as quorum sensing (QS). Many bacteria use QS signaling systems to synchronize target gene expression and coordinate biological activities among a local population. N-acylhomoserine lactones (AHLs) are one family of the well-characterized QS signals in Gram-negative bacteria, which regulate a range of important biological functions, including virulence and biofilm formation. Several groups of AHL-degradation enzymes have recently been identified in a range of living organisms, including bacteria and eukaryotes. Expression of these enzymes in AHL-dependent pathogens and transgenic plants efficiently quenches the microbial QS signaling and blocks pathogenic infections. Discovery of these novel quorum quenching enzymes has not only provided a promising means to control bacterial infections, but also presents new challenges to investigate their roles in host organisms and their potential impacts on ecosystems.