Pierre Guiraud

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Fungi were isolated from soil samples corresponding to pesticide-contaminated soil (CS) and noncontaminated soil (NCS) in the Annaba vicinity (Algeria) and identified. The number of isolates obtained from CS and NCS were 263 and 288, respectively. The most frequent species (Aspergillus fumigatus, A. niger, A. terreus, Absidia corymbifera, and Rhizopus(More)
The ability of Micromycetes strains to produce extracellular phenoloxidases was examined on solid malt agar medium using ten different reagents. We established a POx index summarizing the global activity given by the ten reagents used. The results indicated a wide variability depending on the taxonomic groups, the genera and the species. Some groups were(More)
Three species of Coprinus: C. sp, C. cinereus and C. micaceus were compared on solid media for some aspects of their physiological behaviour and cultural requirements (temperature, pH, substrate). Constitutive extracellular enzymatic activities were also determined. The Coprinus spp. exhibited different physiological and cultural features. Cultures of the 3(More)
OBJECTIVES The aim of the study was to determine whether a nonoperative approach is able to reduce renal parenchymal loss after renal trauma. METHODS Sixty-four consecutive patients with major blunt renal lacerations were treated from 1988 to 1999. Initial management was conservative. In group 1 (35 patients) delayed hemorrhage, persistent urinoma or(More)
Bacteria have been isolated from 10 different strains of Phanerochaete chrysosporium, a white rot fungus which degrades lignocellulosic materials. The investigations showed that one or more bacterial species were always associated with the fungus. Various attempts to eliminate the bacteria on the fungus were unsuccessful. Three different bacterial species(More)
The expression of the HIV-1 Tat protein in HeLa cells resulted in a 2.5-fold decrease in the activity of the antioxidant enzyme glutathione peroxidase (GPX). This decrease seemed not to be due to a disturbance in selenium (Se) uptake. Indeed, the intracellular level of Se was similar in parental and tat-transfected cells. A Se enrichment of the medium did(More)
The radioactive isotope 65Zn was used to study the incorporation of zinc by cultured human skin fibroblasts. The development of the method for studying cell uptake of 65Zn in a minimal synthetic medium is presented. Kinetics carried out on control cultures up to 240 min indicated that zinc uptake occurred in three phases, the first being the most rapid.(More)
The bounded dynamics of a system of two coupled piecewise affine and chaotic Lorenz maps is studied over the coupling range, from the uncoupled regime where the entropy is maximal, to the synchronized regime where the entropy is minimal. By formulating the problem in terms of symbolic dynamics, bounds on the set of orbit codes (or the set itself, depending(More)