Showing papers by "University of Rouen published in 1986"
TL;DR: Three- and two-flux models for solving the scattering transfer equation in terms of Lorenz-Mie parameters are derived from the general formulas and the connection with classical literature is pointed out.
Abstract: In a previous paper, four-flux models for solving the scattering transfer equation in terms of Lorenz-Mie parameters were designed for Lorenz-Mie scatter centers embedded in a slab. Formulas for the various transmittances and reflectances were established. The special cases of transparent and nonscattering particles require special treatments which are described in the present work and lead to simpler formulas. The special case of completely opaque atmospheres is also considered. Three- and two-flux models are derived from the general formulas. The connection with classical literature is pointed out.
98 citations
TL;DR: In this article, the salinity dependence of xanthan conformation is analyzed on the basis of Yamakawa's theory for a wormlike chain model with a total persistence length comprising a structural part, which is found to assume different values depending on the nature of the secondary structure (ordered or not), and an electrostatic part which is dependent on the ionic strength.
95 citations
TL;DR: Results indicate that NPY located in the hypothalamo-hypophyseal system of the frog may act as a melanotropin-release inhibiting factor.
84 citations
TL;DR: Le polyacide β-maleique semble etre le polymere fonctionnel le plus attirant pour elaborer des polymeres ''prodrug'' as discussed by the authors.
Abstract: Le polyacide β-maleique semble etre le polymere fonctionnel le plus attirant pour elaborer des polymeres «prodrug»
71 citations
TL;DR: This article showed that xanthan molecules at room temperature may assume at least three different conformations in 0.1 m NaCl aqueous solutions in which the local structure is ordered.
63 citations
TL;DR: In this article, Copolymerisation anionique des derives (R) et (S) en presence of triethylamine and de porphyrine d'aluminium.
Abstract: Copolymerisation anionique des derives (R) et (S) en presence de triethylamine et de porphyrine d'aluminium
54 citations
TL;DR: The results indicate that frog cardiocytes synthetize a peptide which is immunologically and biochemically related to mammalian ANF.
53 citations
TL;DR: It is shown that the set of conjugacy factors is a recognizable subset of the free partially commutative monoid and that the connected solutions are cyclic.
49 citations
TL;DR: Measurement of glutamate decarboxylase (GAD) activity in the intermediate lobe of the frog pituitary and brain showed that neurointermediate lobe extracts represented 12% of the GAD activity detected in the whole brain, suggesting that GABA A and GABa b receptors were present on frog melanotrophs.
45 citations
TL;DR: The present findings indicate that, in amphibians, MCH-like peptide is located in specific hypothalamic neurons, and suggests that MCH may be released by neurohypophyseal nerve endings as a typical neurohormone.
39 citations
01 Jan 1986
TL;DR: The most suitable solution remains the use of bioresorbable plastic systems due to their combining various potential advantages: — better bone remodeling because of better matching of mechanical properties with respect to bone, — no need for reoperation to remove the appliance after bone-healing, and — possibility for incorporating antibiotics through sustained delivery of the entrapped drug.
Abstract: Metals have been used extensively for internal fixation of bone fractures. However, shortcomings of metallic plating or nailing are now well identified and the interest for internal fixation devices made of more flexible materials is growing fast. In this respect, plastic-based systems appear attractive, particularly carbon fiber reinforced composites. However, the most suitable solution remains the use of bioresorbable plastic systems due to their combining various potential advantages: — better bone remodeling because of better matching of mechanical properties with respect to bone, — no need for reoperation to remove the appliance after bone-healing, and — possibility for incorporating antibiotics in view of preventing infection through sustained delivery of the entrapped drug.
TL;DR: It is demonstrated that TRH reverses the inhibitory effect of dopamine (for concentrations ranging from 3.16 X 10(-8) to 10(-6) M) on alpha-MSH secretion and that the effects of TRH and dopamine are additive.
TL;DR: A new method of laser-saturated fluorescence shot-to-shot concentration measurement is proposed, based on use of the wing effect of a nonuniform laser irradiance, which is independent of both the collisional transfer rate and variation in laser power.
Abstract: A new method of laser-saturated fluorescence shot-to-shot concentration measurement is proposed. The method is based on use of the wing effect of a nonuniform laser irradiance. The measurement is independent of both the collisional transfer rate and variation in laser power. If the laser power is known it is also a method of measurement of the collisional transfer rate at any pressure.
TL;DR: It is demonstrated that an ANF-like substance is contained in nerve terminals of the frog pars nervosa, and the hypothesis that ANF may exert a physiological role in the control of release of neurohypophyseal peptides is supported.
TL;DR: The combined techniques of high-power decoupling, cross-polarization and magic-angle rotation have been applied to lead-207 NMR of solid organolead compounds for the first time as mentioned in this paper.
TL;DR: The results suggest that in amphibians, several peptides other than ACTH may be involved in the control of corticosteroidogenesis.
TL;DR: From the results, the hypothesis is put forward that the mean size of the soot particles depends mainly on their residence time.
Abstract: The mean size and number density of soot particles formed in a CH4-O2 premixed flat flame are measured by diffusion broadening spectroscopy for two equivalence ratios and three cold gas velocities. The influences of the time transit and the Cunningham coefficient C(Kn) are pointed out. By comparing dynamic with static light scattering, it is shown that C(Kn) has to be used. From the results, the hypothesis is put forward that the mean size of the soot particles depends mainly on their residence time.
TL;DR: It is concluded that, in the frog, glycosylation of POMC has no influence on the biosynthesis, processing and release of intermediate lobe hormones and that intracellular processing of this prohormone gives rise to smaller glycopeptides including Glycosylated gamma-MSH.
TL;DR: In particular, this article showed that for all the sequences (A1,...,Ap) and (B1,,...,Bq) in a set, there exists a finitely additive measure θ on A such thatm≦θ≦m(A_i ) \leqq } \sum\limits_{i = 1} √ q {M(B_i)} is satisfied.
Abstract: LetX be a set,A an algebra of subsets ofX, m andM two mappings fromA to\(\bar {\mathbb{R}_(+)}\). Then there exists a finitely additive measure θ onA such thatm≦θ≦M if and only if for all the sequences (A1, ...,Ap) and (B1, ...,Bq) inA such that\(\sum\limits_{i = 1}^p {1_{A_i } \leqq } \sum\limits_{i = 1}^q {1_{Bi} }\) the inequality\(\sum\limits_{i = 1}^p {m(A_i ) \leqq } \sum\limits_{i = 1}^q {M(B_i )}\) is satisfied. This simple condition permits us to deduce and generalize many previous results relating to the “marginal problem”.
TL;DR: The projections of GRF neurons in extra-infundibular regions suggest that GRF can also act as a neuromodulator or neurotransmitter in the hypothalamus.
Abstract: The distribution of growth hormone-releasing factor (GRF)-like immunoreactivity in the human hypothalamus was studied by light-microscopic immunocytochemistry. With antibodies that we developed against synthetic human pancreatic GRF (hpGRF), we localized GRF immunoreactivity in neuronal cell bodies that were observed only in the infundibular (arcuate) nucleus. Immunostained nerve fibers were found in large numbers in the neurovascular zone of the median eminence, in the proximal portion of the pituitary stalk and in periventricular areas. These localizations are in agreement with those of studies recently performed in other species and strongly suggest that GRF can be released into the capillaries of the pituitary portal plexus to reach the anterior pituitary gland. The projections of GRF neurons in extra-infundibular regions suggest that GRF can also act as a neuromodulator or neurotransmitter in the hypothalamus.
TL;DR: A common origin of the blood supply to a dural arteriovenous malformation and to the spinal cord from the same segmental artery is very rare, and demonstrating the location of the normal spinal blood supply system is mandatory to avoid postoperative complications.
Abstract: A common origin of the blood supply to a dural arteriovenous malformation and to the spinal cord from the same segmental artery is very rare. This obviously contraindicates embolization of the fistula. Demonstrating the location of the normal spinal blood supply system is therefore mandatory to avoid postoperative complications. The visualization of the normal blood vessels can be masked by a steal phenomenon, but it must at all costs be obtained. The authors describe one such case.
TL;DR: In this paper, the authors continue the revision of the ammonite faunas of the type Cenomanian, dealing with the Mantelliceratinae, the dominant Lower CENomanian representatives of the Acanthoceratacea.
TL;DR: Dopamine uptake into striatal synaptosomes was identical in ethanol preferring and non preferring rats, leading us to suppose that striatal dopamine is not involved in the voluntary intake of ethanol by rats.
TL;DR: Results indicate that, in the frog, ACh stimulates corticosteroid secretion through a PG-dependent mechanism through a desensitization phenomenon.
TL;DR: The results indicate that PGI2 might be an important mediator of adrenal steroidogenesis in frog and confirm that the corticosteroidogenic actions of ACTH and AII are mediated by different mechanisms.
01 Feb 1986
TL;DR: A student model based on the student's cognitive processes is described that includes, for each student, his/her domain knowledge and the specific heuristics and it uses meta‐knowledge of problem solving.
Abstract: ELECTRE is a project to build an intelligent tutoring system for learning basic electricity. This paper describes a student model based on the student's cognitive processes. This model includes, for each student, his/her domain knowledge and the specific heuristics. Moreover, it uses meta-knowledge of problem solving. This model is simulated by a knowledge-based system that controls the solving processes by meta-rules. A case study is presented.
ELECTRE est un projet de systeme tutoriel intelligent ? apprentissage de ľelectriciteelementaire. Ce papier decrit une modelisation de ľetudiant basee sur ses processus cognitifs. Ce modele comprend, pour chaque etudiant, les connaissances du domaine ainsi que les heuristiques specifiques. De plus, il utilise la metaconnaissance de resolution de probleme. Ce modele est simule par un systeme expert qui controle les processus de resolution par des metaregles. Une etude de cas est presentee.
Mots cles: systeme tutoriel intelligent, modele cognitif, systeme expert, metaconnaissance, science cognitive, enseignement de lcaron; electricite.
TL;DR: Covalent chromatography on thiol-activated Sepharose CL-4B allowed the specific binding of the 2-oxoglutarate dehydrogenase complex activity in the presence of 2-OxoglUTarate, whereas the pyruvate dehydrogen enzyme complex activity was retained inThe presence of pyruVate.
TL;DR: Results show the presence of both met-enkephalin and the heptapeptide met- enkephin-Arg(6)-Phe(7) and the lack of met-Enkephino-Gly(7)-Leu(8) in frog chromaffin cells.
TL;DR: In this article, a nonblocked zero-frequency filtering technique was used to improve the in-line holographic recording of small objects at extended distances from the hologram, and the irradiance distributions in three planes (i.e., in projected images, diffraction patterns, and reconstructed images) were calculated.
Abstract: A nonblocked zero-frequency filtering technique is used to improve the in-line holographic recording of small objects at extended distances from the hologram. Since the filter is coated on the relay lens, the irradiance distributions in three planes (i.e., in projected images, diffraction patterns, and reconstructed images) are calculated. Influences of filter diameter, filter transmittance, and exposure level of holograms are considered in discussing fringe visibility, image forms, and image contrast.
TL;DR: In this article, the influence on image quality of a finite aperture due to low-contrast response is discussed taking into account the average exposure level of holograms, and the reconstructed image plane is computed taking into consideration both finite and infinite hologram apertures.
Abstract: Irradiance distributions in the reconstructed image plane are computed taking into consideration both finite and infinite hologram apertures. The influence on image quality of a finite aperture due to low-contrast response is discussed taking into account the average exposure level of holograms.