Mohamed Ettayebi

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Although polyomavirus JC (JCV) is the proven pathogen of progressive multifocal leukoencephalopathy, the fatal demyelinating disease, this virus is ubiquitous as a usually harmless symbiote among human beings. JCV propagates in the adult kidney and excretes its progeny in urine, from which JCV DNA can readily be recovered. The main mode of transmission of(More)
During olive oil production, large quantities of olive mill wastewater (OMW) are produced. This wastewater material, containing a high level of phenolic compounds, poses a serious environmental problem in almost all Mediterranean countries. Candida tropicalis YMEC14 was used as an extremophile strain to design an aerobic biotreatment process to detoxify OMW(More)
Two chloramphenicol resistance mutations were isolated in an Escherichia coli rRNA operon (rrnH) located on a multicopy plasmid. Both mutations also confer resistance to 14-atom lactone ring macrolide antibiotics, but they do not confer resistance to 16-atom lactone ring macrolide antibiotics or other inhibitors of the large ribosomal subunit. Classic(More)
Recombinant DNA and classic genetic procedures were used to map a spectinomycin resistance mutation to a 121 base pair region of a 16S RNA gene and a macrolide-lincosamide-streptogramin type B resistance mutation to a 32 base pair region of a 23S RNA gene. DNA sequence analysis of these regions revealed that spectinomycin resistance results from a C/G to(More)
The emulsifying agents used to disperse essential oils in culture media can interfere in the estimation of essential oils antimicrobial activity; we showed in this study that 0.2% Agar suspension was sufficient to obtain a stable dispersion of oregano and clove essential oils in liquid media comparable to the dispersions obtained with tween 80 (0.25%) or(More)
During the history of civilizations, advanced wood decay results from exposure to various agents for long periods of time. Bio-deterioration, under the influence of living organisms like fungi, can cause massive damage to historical monuments. In this work, we found that fungi participating in wood degradation share a single strategy for degrading wood(More)
Fifty-two clinical isolates of herpes simplex virus type 1 (HSV-1) from Saudi Arabian patients were analysed by restriction endonuclease digestion of the virus DNA using the enzymes HindIII and BamHI, followed by hybridization with 32P labelled DNA of laboratory strain F. Of the isolates, 17 were resolved into four distinct cleavage patterns with HindIII(More)
Calcium alginate-immobilized Candida tropicalis and Saccharomyces cerevisiae are compared for glucose fermentation. Immobilized C. tropicalis cells showed a slight morphological alteration during ethanol production at 40 degrees C, but their fermentation capacity was reduced by 25%. Under immobilization conditions, the two species demonstrated two different(More)
Samples of traditional Kaddid (a salted dried meat) were analysed for their microbiological and physico-chemical characteristics. Microbiological determinations included the Standard Plate Count (SPC), total and faecal coliforms, enterococci, staphylococci, Salmonella, Clostridium, and Pseudomonas, whereas physico-chemical properties were characterized by(More)