منابع مشابه
Phototargeting oral black-pigmented bacteria.
We have found that broadband light (380 to 520 nm) rapidly and selectively kills oral black-pigmented bacteria (BPB) in pure cultures and in dental plaque samples obtained from human subjects with chronic periodontitis. We hypothesize that this killing effect is a result of light excitation of their endogenous porphyrins. Cultures of Prevotella intermedia and P. nigrescens were killed by 4.2 J/...
متن کاملBlack-pigmented Bacteroides spp. in human apical periodontitis.
The incidence of black-pigmented (BP) Bacteroides spp. in 62 human dental root canal infections (35 acute and 27 clinically asymptomatic cases of apical periodontitis) in 57 adults was studied. Altogether 37 strains of BP Bacteroides were found in 31 infections, always in mixed anaerobic infections. Two different BP Bacteroides species were present in six infections. B. intermedius was most fre...
متن کاملBlack-pigmented gram-negative anaerobes in endodontic infections.
Necrotic dental root canal infections are polymicrobial infections dominated by anaerobic bacteria. The number of different species in one canal is usually low, approx. 4-7 species. The species isolated most frequently belong to the genera Prevotella, Porphyromonas, Fusobacterium, Peptostreptococcus, Eubacterium and Streptococcus. The frequency of isolation of black-pigmented Gram-negative anae...
متن کاملThe Black Bug Myth: Selective photodestruction of pigmented pathogens.
BACKGROUND AND OBJECTIVE It is commonly believed that pigmented pathogens are selectively targeted by dental lasers. To test this notion optical diffuse reflection spectroscopy (DRS) was used to obtain absorption spectra for the periodontal pathogens, Porphyromonas gingivalis (Pg) and Prevotella intermedia (Pi). MATERIALS AND METHODS Spectra from 400 to 1,100 nm wavelengths of Pg colonies cul...
متن کاملExophiala Pneumonia Presenting with a Cough Productive of Black Sputum
Exophiala species are black, yeast-like molds that can cause subcutaneous cysts as well as disseminated disease. Isolated pneumonia due to Exophiala species is extremely uncommon. We report a case of isolated Exophiala pneumonia in a patient with bronchiectasis who presented with worsening dyspnea and a cough productive of black sputum. The production of black sputum, known as melanoptysis, is ...
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ژورنال
عنوان ژورنال: Journal of Cytology
سال: 2013
ISSN: 0970-9371
DOI: 10.4103/0970-9371.126667