Les pratiques zootechniques actuelles en relation avec la qualité des carcasses et de la viande bovine: réalité ou mythe?

Conference given outside the academic context (1993)

Transplants of syngenic cultured, DRG-derived Schwann cells into the lesioned adult rat spinal cord.

Conference (1993, October 17)

Flux argileux du Néogène au Quaternaire dans l'Océan Indien Nord. Mise en évidence et interprétation

Doctoral thesis (1993)

Morphology and time variation of the Jovian Far UV aurora: Hubble Space Telescope observations

in Journal of Geophysical Research (1993), 98

High spatial resolution images of the north polar region of Jupiter have been obtained with the Faint Object Camera (FOC) on board the Hubble Space Telescope (HST). The first set of two images collected ... [more ▼]

High spatial resolution images of the north polar region of Jupiter have been obtained with the Faint Object Camera (FOC) on board the Hubble Space Telescope (HST). The first set of two images collected 87 min apart in February 1992 shows a bright (approximately or equal to 180 kR) emission superimposed on the background in rotation with the planet. Both Ly alpha images show common regions of enhanced emission but differences are also observed, possibly due to temporal variations. The second group of images obtained on June 23 and 26, 1992 isolates a spectral region near 153 nm dominated by the H2 Lyman bands and continuum. Both pictures exhibit a narrow arc structure fitting the L = 30 magnetotail field line footprint in the morning sector and a broader diffuse aurora in the afternoon. They show no indication of an evening twilight enhancement. Although the central meridian longitudes were similar, significant differences are seen in the two exposures, especially in the region of diffuse emission, and interpreted as signatures of temporal variations. The total power radiated in the H2 bands is approximately or equal to 2 x 10[SUP]12[/SUP] W, in agreement with previous UV spectrometer observations. The high local H2 emission rates (approximately 450 kR) imply a particle precipitation carrying an energy flux of about 5 x 10[SUP]-2[/SUP] W/sq m. [less ▲]

Développement et intégration d'outils informatiques pour l'aide à la décision environnementale. Application à la conception architetcturale.

Doctoral thesis (1993)

Cette thèse a montré comment les modèles informatique devaient être intégrés et devaient communiquer de l'information entre eux pour être appliqués efficacement aux problèmes d'environnement. L ... [more ▼]

Cette thèse a montré comment les modèles informatique devaient être intégrés et devaient communiquer de l'information entre eux pour être appliqués efficacement aux problèmes d'environnement. L'application priviliégiée est la conception de bâtiments dans une optique durable. [less ▲]

Development of a combined mechanical and enzymatic method for the isolation of intact preantral follicles from fetal, calf and adult bovine ovaries

in Theriogenology (1993), 40(4), 789-799

The isolation of preantral follicles from the ovaries of bovine fetuses, calves and adult cows was performed using a simple, rapid mechanical and enzyme method. The ovaries were cut into small pieces with ... [more ▼]

The isolation of preantral follicles from the ovaries of bovine fetuses, calves and adult cows was performed using a simple, rapid mechanical and enzyme method. The ovaries were cut into small pieces with a tissue chopper. Then, the suspension was filtered successively through 500 and 100 μm nylon mesh filters. This simple mechanical procedure resulted in large numbers of isolated preantral follicles: 2,142 ± 254; 512 ± 92 and 298 ± 54 from the ovaries of bovine fetuses, calves and cows, respectively. In addition, the ovarian fragments between 100 and 500 μm were suspended in 10 ml of M199 Hepes medium plus 5% FCS and divided into 2 equal parts: one portion was used for collagenase treatment (200 U/ml) for 20 minutes, while the other served as a control. Collagenase treatment resulted in 841 ± 161; 216 ± 51 and 52 ± 17 preantral follicles from fetuses, calves and cows, respectively, compared with 312 ± 86; 52 ± 15 and 10 ± 2 in the control group. The use of collagenase with ovarian fragments selected by filtration as a method for increasing the rate of recovery of preantral follicles is described here. [less ▲]

Plasma Histamine and Bronchial Reactivity in Allergic Asthma

in Allergy (1993), 48(7), 547-9

Histamine is an important mediator of allergic inflammation and bronchial hyperresponsiveness (BHR), a hallmark of asthma. Studies on the relationship between plasma histamine and BHR in allergic ... [more ▼]

Histamine is an important mediator of allergic inflammation and bronchial hyperresponsiveness (BHR), a hallmark of asthma. Studies on the relationship between plasma histamine and BHR in allergic asthmatic patients have yielded controversial results. We therefore measured plasma histamine and bronchial reactivity in 30 nonsmoker volunteers taking no medication. Eleven were normal subjects; 19 were stable, mildly allergic asthmatic patients. Venous blood was taken to measure blood cells and basal plasma histamine by radioimmunoassay. After blood sampling, all subjects underwent a measurement of PC20M (concentration of methacholine causing a 20% fall in FEV1). Mean plasma histamine levels were 0.21 +/- 0.1 ng/ml and 0.44 +/- 0.3 ng/ml in normal and asthmatic subjects, respectively (P < 0.05). We found a significant increase of blood eosinophils and basophils in asthmatic patients, and a positive correlation between plasma histamine and circulating basophils. PC20M was greater than 16 mg in normal volunteers, and mean PC20M was 2.1 +/- 2 mg/ml in asthmatic patients. PC20M did not correlate with plasma histamine levels, but it did so negatively with blood eosinophils. The increased plasma histamine concentration in mildly atopic asthmatic patients might be a consequence of the high basophil releasability of atopics and the higher basophil counts in allergic asthma. Plasma histamine is thus unlikely to be a determinant of BHR in asthma. [less ▲]

Antigen microencapsulation using a spray-drying technique

Poster (1993, October)

An Enhanced Version of Timed LOTOS and its Application to a Case study

in Tenney, R. L.; Amer, P. D.; Uyar, M. U. (Eds.) FORMAL DESCRIPTION TECHNIQUES, VI (1993, October)

We propose here ET-LOTOS, a timed extension of LOTOS. It is an enhancement of Timed LOTOS that we presented at FORTE 92. We show how some simple modifications allow us to improve the expressiveness of our ... [more ▼]

We propose here ET-LOTOS, a timed extension of LOTOS. It is an enhancement of Timed LOTOS that we presented at FORTE 92. We show how some simple modifications allow us to improve the expressiveness of our former formalism. To assess ET-LOTOS, we apply it to the specification of a small case study. Finally, we show how the semantics of ET-LOTOS could be modified to easily define more powerful operators, if one ever had to. [less ▲]

Antigen microencapsulation using a spray-drying technique.

Poster (1993, October)