نتایج جستجو برای: porphyromonas

تعداد نتایج: 3941  

Journal: :Journal of environmental biology 2012
Jae-Suk Choi Yu-Mi Ha Chi-Un Joo Kwang Keun Cho Sung-Jo Kim In Soon Choi

Fifty-seven species of common seaweed from the Coast of Korea were screened for antimicrobial (i.e. inhibition of Prevotella intermedia and Porphyromonas gingivalis growth) activity. As a source of bioactive compounds, seaweeds can produce many secondary metabolites with a variety of activities. Using the agar diffusion method, only 17 species (29.8%) showed inhibitory activity. Of these, metha...

2015
Keum Jin Baek Suk Ji Yong Chul Kim Youngnim Choi

Porphyromonas gingivalis is one of the well-characterized periodontal pathogens involved in periodontitis. The invasive and proteolytic activities of P. gingivalis clinical isolates have been shown to be associated with heterogenic virulence, as determined in a mouse abscess model. The aims of the present study were to identify a P. gingivalis strain with a low virulence among clinical isolates...

Journal: :Drug discoveries & therapeutics 2011
M Okajima M Kanzaki Y Ishibashi Y Wada F Hino Y Kitahara K Shimokawa F Ishii

As typical periodontopathic bacteria, Porphyromonas gingivalis (P. gingivalis) and Aggregatibacter actinomycetemcomitans (A. actinomycetemcomitans) were exposed to electrolyzed ion-reduced water (ERI) and ERI containing 1% sodium carboxymethylcellulose (CMC-Na) (ERI-1% CMC-Na), and the time course of their bactericidal action was evaluated. More than 99% of each bacteria species were killed aft...

Journal: :The Journal of antimicrobial chemotherapy 1997
A M Lo Bue B Rossetti G Calì G Nicoletti F Condorelli

The first pathogenic mechanism of Porphyromonas gingivalis, which is mainly responsible for adult periodontal diseases, is the attachment of fimbriae appendages to oral epithelial cells. The ability of a subinhibitory concentration of azithromycin to inhibit the expression of fimbriae in various strains of P. gingivalis isolated was investigated. A one-eighth subinhibitory concentration of azit...

Journal: :Infection and immunity 2011
Christina O Igboin Melvin L Moeschberger Ann L Griffen Eugene J Leys

Porphyromonas gingivalis has been implicated in the etiology of adult periodontitis. In this study, we examined the viability of Drosophila melanogaster as a new model for examining P. gingivalis-host interactions. P. gingivalis (W83) infection of Drosophila resulted in a systemic infection that killed in a dose-dependent manner. Differences in the virulence of several clinically prevalent P. g...

2009
Nikola Angelov Raydolfo M Aprecio James Kettering Tord Lundgren Matt Riggs Jan Egelberg

BACKGROUND The aim of this study was to compare the recovery of three putative periodontal pathogens from periodontal lesions in samples using paper points inserted to different depths of the lesions. METHODS Twenty 6-8 mm deep periodontal lesions with bleeding on probing were studied. Microbial samples were obtained using paper points inserted to three different depths of the lesions: orific...

Journal: :The Bulletin of Tokyo Dental College 2002
Yukio Yamano Kohei Sawaki Kazuyuki Ishihara Kazuhiko Miyamoto Katsumi Ohno Mitsuru Kawaguchi

This study examined the effects of storage conditions such as time course, temperature, fluorescent light, and darkness on the components and antibacterial activity of formalin guaiacol (FG) used in endodontic treatment. We measured the quantities of formaldehyde and guaiacol in FG and antibacterial activities against Staphylococcus aureus, Porphyromonas gingivalis, and Porphyromonas endodontal...

Journal: :Journal of oral science 2005
Michiko Kiyama-Kishikawa Koichi Hiratsuka Yoshimitsu Abiko

Hemin is an important nutrient for Porphyromonas gingivalis growth and pathogenicity. We examined the gene expression profile of P. gingivalis, including genes involved in its pathogenicity, at various growth stages under hemin-standard and limited conditions by using a custom-made microarray. The transcription of many genes decreased after late-log and mid-log phases under hemin-standard and l...

Journal: :Infection and immunity 1992
A Amano T Ishimoto H Tamagawa S Shizukuishi

Porphyromonas gingivalis in which the synthesis of superoxide dismutase (SOD) was induced by nitrate or by aeration was rendered resistant to killing by polymorphonuclear leukocytes. SOD purified from either anaerobically maintained or aerated cells also inhibited bacterial killing when added exogenously, and no difference between the effects of the two SODs was observed. These results suggest ...

Journal: :Journal of bacteriology 1994
P Ciborowski M Nishikata R D Allen M S Lantz

Porphyromonas gingivalis, and organism implicated in the etiology and pathogenesis of human periodontal diseases, produces a variety of potent proteolytic enzymes, and it has been suggested that these enzymes play a direct role in the destruction of periodontal tissues. We now report that two cell-associated cysteine proteinases of P. gingivalis W12, with molecular masses of approximately 150 k...

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