Violet-pigmented bacteria, which have been described since the end of the 19th century, are occasionally the causative agent of septicemia and sometimes cause fatal infection in human and animals. Bacteria, producing violet colonies due to the production of a nondiffusible pigment violacein, were classified as a redefined genus Chromobacterium. Chromobacterium violaceum is gram-negative, and sa...

Periodontal diseases are the inflammatory diseases triggered specifically by some selected microorganisms, i.e., periodontopathic bacteria, accumulated in and around the gingival crevice. Among periodontopathic bacteria, Porphyromonas gingivalis, a black-pigmented gram-negative anaerobic rod, has been implicated as a major pathogen of chronic periodontitis (Hamada et al., 1991; Lamont & Jenkins...

Methylotrophic bacteria able to grow on one-carbon compounds, such as methanol and monomethylamine, as sole carbon sources have received considerable attention because of their potential commercial applications, including the production of single-cell protein, amino acids, pyrroloquinoline quinone, and poly-3-hydroxybutyrate. The utility of methylotrophs should be increased by the use of recomb...

Using an unbiased stereological technique, the total numbers of pigmented and non-pigmented neurons were estimated in the substantia nigra of seven patients with Parkinson's disease and seven control patients. Compared with the controls, in which the average total number of pigmented neurons was 550,000, the number of neurons was reduced by 66% in the patients. The average total number of non-p...

An interesting case of extreme specificity of enrichment and selective culture procedures has recently been described for methane-utilizing bacteria (Leadbetter and Foster, 1958). Obligate methane-utilizing pseudomonads (Pseudomonas methanica) invariably were obtained from inocula from a great many natural sources. A further degree of specificity within the group was encountered; it was found t...

This case report is concerned with a 30 year old patient diagnosed with pigmented villonodular synovitis (PVNS) in the knee. The patient underwent an orthopedic surgical operation to remove the lesions. PVNS is a rare proliferative disorder, mostly benign and affecting the knee; its aetiology remains unclear. It represents a medical challenge because of non-specific symptoms that delay the diag...

AIMS To determine whether dosing with bacteriocin-producing Streptococcus salivarius following an antimicrobial mouthwash effects a change in oral malodour parameters and in the composition of the oral microbiota of subjects with halitosis. MATERIALS AND RESULTS Twenty-three subjects with halitosis undertook a 3-day regimen of chlorhexidine (CHX) mouth rinsing, followed at intervals by the us...

Basal cell carcinoma (BCC) is the most frequent type of skin cancer in humans. Non-pigmented BCCs are much more prevalent than pigmented BCCs. Sometimes it could be difficult to distinguish a pigmented BCC from a melanoma [1]. Menzies et al. suggested a dermatoscopic method with a sensitivity of 93% and a specificity of 89% for diagnosing pigmented BCCs (See Table) [2,3]. The correct answer to ...

There is a paucity of information about the difference in the presentation of eczema in darkly pigmented skin compared to children with fair or white skin. This article describes the possible challenges of diagnosing eczema in children with darkly pigmented skin. The physiological difference in darkly pigmented skin compared with fair or white skin is explored, and how eczema may be manifested ...

The genus Methylobacterium is composed of pink-pigmented facultative methylotrophic (PPFM) bacteria, which are able to synthesize carotenoids and grow on reduced organic compounds containing one carbon (C1), such as methanol and methylamine. Due to their high phenotypic plasticity, these bacteria are able to colonize different habitats, such as soil, water, and sediment, and different host plan...