Search results for "Facteur"
showing 10 items of 73 documents
Differential effect of hypophysectomy and growth hormone treatment on hepatic glucuronosyltransferases in male rats: Evidence for an action at a pret…
1997
International audience; The influence of growth hormone (GH) on 4-nitrophenol, bilirubin, testosterone, androsterone and estrone glucuronidation activities was studied in fully activated male rat hepatic microsomes. Sham-operated and hypophysectomized animals were injected with two different dosages of GH, mimicking either the male or female GH secretion pattern. Half the animals received thyroxine and cortisol in concentrations chosen to compensate for the lack of thyroid hormones and glucocorticoids in hypophysectomized rats. GH induced a decrease in several glucuronidation activities: bilirubin glucuronidation in both sham-operated and cortisol/ thyroxine-treated hypophysectomized rats i…
Les followers ont-ils vraiment de l'importance dans le modèle de Stackelberg?
2011
In this paper, we consider a T-stage linear model of Stackelberg oligopoly. First, we show geometrically and analytically that under the two conditions of linear market demand and identical constant marginal costs, the T-stage Stackelberg model reduces to a model where T oligopolies exploit residual demand sequentially. At any stage, leaders behave as if followers did not matter. Second, we study social welfare and convergence toward competitive equilibrium. Especially, we consider the velocity of convergence as the number of firms increases. The convergence is faster when reallocating firms from the most to the less populated cohort until equalizing the size of all cohorts.
HAPEX-Sahel
1997
The variation in evaporative fraction and actual evaporation is examined for three sample days in the HAPEX-Sahel Intensive Observation Period (IOP), including data from all the vegetation types and sites. The trends in evaporative fraction over the IOP are also presented for eight sites. The high rate of evaporation from bare soil in the days following rainfall produces a variability in evaporation which makes differences between sites difficult to interpret on a day-to-day basis, but over the whole IOP it is shown that the millet uses a smaller proportion of the available energy for evaporation than the tiger bush or fallow savannah. The combined effect of differences in the total energy …
Specific DNA probes to detect Escherichia coli strains producing cytotoxic necrotising factor type 1 or type 2
1994
Cytotoxic necrotising factors type 1 (CNF1) and type 2 (CNF2) are produced by many Escherichia coli strains isolated from man and animals with intestinal or extra-intestinal colibacillosis. In most laboratories, CNF-producing strains are detected by a cell cytotoxicity assay and confirmed with a neutralisation assay or a mouse footpad assay. In this study, we sought to determine whether DNA probes could detect clinical isolates of E. coli producing CNF2 or CNF1, or both, without the need for cell cultures or animal assays. Two internal fragments of the gene encoding CNF2 were used as DNA probes: a 875-bp XhoI-PstI DNA fragment and an adjacent 335-bp PstI-ClaI fragment. A positive response w…
Sérologie discordante du VIH/sida et vie des couples en République du Congo : profil sociodémographique, comportements, facteurs de survie et prise e…
2020
For more than two decades, the health of populations has been at the heart of developmental issues. Population health issues fall within the "health, population and development" paradigm. It is in this spirit that experts demonstrated at the 1994 Cairo Conference on Population and Development that HIV/AIDS affects both population growth and sustainable development. Likewise, HIV infection is a source of discrimination, social inequalities, and the weakening of couples and families to the point where some individuals are even ostracized because of their HIV-positive status. In these conditions, how do people of different serological status live their married lives and their procreation despi…
Asymptotic analysis of the form-factors of the quantum spin chains
2020
Since a long-time, the quantum integrable systems have remained an area where modern mathematical methods have given an access to interesting results in the study of physical systems. The exact computations, both numerical and asymptotic, of the correlation function is one of the most important subject of the theory of the quantum integrable models. In this context an approach based on the calculation of form factors has been proved to be a more effective one. In this thesis, we develop a new method based on the algebraic Bethe ansatz is proposed for the computation of the form-factors in thermodynamic limit. It is applied to and described in the context of isotropic XXX Heisenberg chain, w…
Megakaryocytic cell line-specific hyperploidy by cytotoxic necrotizing factor bacterial toxins
1996
Cytotoxic necrotizing factor (CNF) toxins, isolated from certain Escherichia coli strains known to cause intestinal and extra intestinal infections, induce reorganization of the actin cytoskeleton and generate hyperploidy in adherent cell lines. We have examined the effect of CNF toxin on one of the few cell types that naturally increase nuclear DNA content, megakaryocytes. Our studies show that only hematopoietic cells capable of differentiating along the megakaryocyte lineage responded to the CNF2 toxin by becoming polyploid and by reorganizing actin. The K562, HEL, and CHRF-288–11 cell lines can be induced with phorbol ester to differentiate along the megakaryocyte lineage, and these cel…
Offre d'équipements socio-culturels et sportifs et comportements des élèves : conséquences pour une politique sociale
1984
Résumé de la recherche financée par le Commissariat Général au Plan.Décision n°30 du 3.11.1981. IREDU-C.N.R.S., Dijon, 124 pages. Mai 1984.; De plus en plus, les pratiques sportives et culturelles passent par l'utilisation d'équipements spécifiques. Laisser la fourniture entièrement au seul secteur privé entrainerait une consommation socialement très inégalitaire, car les individus devraient alors acquitter intégralement un prix très élevé. Actuellement, la réduction des inégalités s'appuie sur la création d'établissements fortement subventionnés par la collectivité, avec pour conséquence un faible prix à acquitter par les individus. Or, dans la réalité, on observe que cette politique n'abo…
Offre d'équipements socio-culturels et sportifs et comportements des élèves
1984
Analyse de l'offre de loisirs et des pratiques d'élèves de 4ème ; action expérimentale avec incitation à la pratique d'une activité sportive ou culturelle ; analyse des réactions immédiatement après l'action et 3 mois après. Propositions pour mener une politique sociale afin d'obtenir une meilleure participation d'une population ciblée.
Offre d'équipements socio-culturels et sportifs et comportement des élèves
1984
International audience