Gabrielle Paquette

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Five polycyclic aromatic hydrocarbon (PAH) degrading bacterial strains, Pseudomonas putida 34, Pseudomonas fluorescens 62, Pseudomonas aeruginosa 57, Sphingomonas sp. strain 107, and the unidentified strain PL1, were isolated from two contaminated soils and characterized for specific features regarding PAH degradation. Degradation efficiency was determined(More)
The capacity of polycyclic aromatic hydrocarbon (PAH)-utilizing bacteria to produce biosurfactants was investigated. Twenty-three bacteria isolated from a soil contaminated with petroleum wastes were able to form clearing zones on mineral salt agar plates sprayed with solutions of PAHs. Naphthalene and phenanthrene were utilized as sole substrates.(More)
The microbial flora of the water produced by two water filtration plants and their drinking water distribution system were evaluated: the Pont-Viau (PV) and the Repentigny (RE) water filtration plants. Untreated water entering the plants contained 3.6 (PV) and 16.8 most probable number of infectious units (mpniu)/L (RE) enteric viruses and total coliform(More)
Cytolytic colonies were found in 57% of tap water samples, and up to 6% of samples were found to contain bacteria having three or more virulence factors. The factors evaluated were cytotoxicity, hemolysis, cell adherence, and cell invasiveness. Overall, 17% of the samples contained cytolytic colonies that were adherent and hemolytic. Among the media tested,(More)
The microbial and viral flora in the ventilating ducts of an apartment building was evaluated. Several types of sampler (slit sampler, Andersen sampler, large volume air sampler) were used to evaluate the hourly, weekly and seasonal variation of this flora. The mean bacterial concentration was 17.2 e.f.u./m3 with a maximum level at 07.30 h (41.3 c.f.u./m3)(More)
Four temperature bacteriophages (designated as PF1, PF2, PF3 and PF4) were isolated from lysogenic strains of Clostridium perfringens type A. On the basis of plaque morphology, pH stability, DNase and RNase resistance, buoyant density, one-step growth parameters and electron microscope phage dimensions, it seems that these phages are different and(More)
The prevalence of cellular atypias has been determined in relation to smoking history, age and type of work of male foundry workers in different departments of a foundry. Participation of the workers was 95%. Out of 677 workers, 528 had results within normal limits, 36 showed mild atypical metaplasia while 4 persons got moderate atypias; 48 individuals(More)
A gas liquid chromatography method for the separation of 10 volatile fatty acids (C1-C7 and isomers) has been improved by using oven temperature programmed conditions. In our conditions, the proprietary stationary phase SP 1220 introduced by Supelco Inc., gave sharp separation of volatile fatty acids in less than 8 min. This method was suitable for analyses(More)
Clostridium perfringens was incubated in the presence of euflavine (EU); the resistant mutants which were thus isolated had highly reduced capacity to release alpha-toxin. This fact was confirmed by lecithinase determinations and by immunoelectrophoresis. Injected into guinea pigs and into 6- to 7-day-old chicks, these mutants were completely avirulent. A(More)