Showing papers by "University of Nice Sophia Antipolis published in 1975"
277 citations
TL;DR: A neurotoxin from the venom of the scorpion affects the closing of the Na+ channel and the opening of the K+ channel in giant axons of crayfish and lobster nerves and is probably a useful tool for biochemical investigation of Na+ and K+ channels.
128 citations
TL;DR: The present reply successively deals with points that are clearly refutable, those which are debatable and those which constitute valid criticism.
Abstract: A. N. Habermann recently published some "Critical comments on the programming language Pascal". His reproaches are principally that numerous constructs are ill-defined, that there is "confusion" amongst ranges, types and structures, and that the goto statement should have been abolished. The present reply successively deals with points that are clearly refutable, those which are debatable and those which constitute valid criticism. Its principal aim is to encourage the reader to form his own opinion.
49 citations
TL;DR: In this article, the power spectrum of a turbulence-degraded image of a point source as a function of exposure time is derived based on the near-field Rytov-Kolmogorov approximations and the Taylor hypothesis.
Abstract: Mathematical expressions are obtained for the power spectrum of a turbulence-degraded image of a point source as a function of exposure time. Calculations are based on the near-field Rytov–Kolmogorov approximations and the Taylor hypothesis. Comparisons with available data are satisfactory.
39 citations
TL;DR: It is concluded that electrogenic Cl transport may be the dominant mechanism for water and salt transport in flounder intestine, and that adaptation to a saline environment involves regulation of pumping rather than of Na or Cl entry across the mucosal membrane.
Abstract: 1. Everted intestinal sacs prepared from Platichthys flesus adapted to sea water (SW) have higher rates of salt and water transport than did sacs prepared from fresh water adapted (FW) fish. 2. Intestines mounted in Ussing chambers gave stable open-circuit voltages and short-circuit currents after pre-incubation for 20--30 min of --1.91 +/- 0.14 (14) mV and --45.0 +/- 5.1 (14) muA/cm2, SW fish, and --1.24 +/- 0.14 (11) mV and --18.2 +/- 3.6 (11) muA/cm2, FW fish. 3. Isotope flux measurements indicated a net Na transport of 21.5 +/- 4.1 (11) neq/cm2-min in SW fish intestines, but no significant Na transport in FW fish (7.6 +/- 7.6 (9) new/cm2-min). Both preparations showed an active Cl transport, 26.6 +/- 6.1 (12) neq/cm2-min for SW and 18.5 +/- 9.7 (17) neq/cm2-min for FW fish. 4. No significant difference in the uptake of Na or Cl across the mucosa was observed between FW and SW fish. The uptake of both ions showed some saturation at high concentrations. 5. Interactions between Na and Cl uptake were small, although Cl uptake was significantly higher in Na-free solutions. 6. It is concluded that electrogenic Cl transport may be the dominant mechanism for water and salt transport in flounder intestine, and that adaptation to a saline environment involves regulation of pumping rather than Na or Cl entry across the mucosal membrane.
35 citations
TL;DR: An additive degree of freedom is defined, which turns out to be an exact measure of the complexity of computation of a family 7 of linear forms in r variables over a field.
Abstract: The notion of the linear algorithm to compute a family 7 of linear forms in r variables over a field is defined. Ways to save addltmns are investigated by analyzing the combinatorial aspects of linear dependences between subrows of a given matrix F. Further, an additive degree of freedom is defined, which turns out to be an exact measure of the complexity of computation of 7.
30 citations
TL;DR: A good development was obtained with both Orchis laxiflora and Ophrys sphegodes Mill, if sucrose, organic nitrogen and vitamins were added to a basic mineral medium containing ammonium nitrate.
Abstract: Summary
In order to assess the role of endophytic fungi in the germination and growth of wild European orchids, Orchis laxiflora Lamk. and Ophrys sphegodes Mill, were tested on asymbiotic strictly defined media. In spite of minor differences between the two species, a good development was obtained with both, if sucrose, organic nitrogen and vitamins were added to a basic mineral medium containing ammonium nitrate. Casein hydrolysate as an organic nitrogen source could be replaced successfully by a reconstitution of its amino acids or by glutamine. Among the vitamins tested thiamine proved to be necessary to Orchis laxiflora.
25 citations
20 citations
TL;DR: In this article, the mean value of mean range azimuthal correlations in multi-peripheral (Q-factorized) cluster production, and test for the size of the mean transverse momentum of the clusters.
19 citations
TL;DR: In this paper, phase properties of generalized coherent states obtained from usual Fock coherent states by adapting classical methods of statistical mechanics, in particular, the well-known procedure of thermodynamical limit, were studied.
19 citations
TL;DR: A synthetic steroid compound, dexamethasone, injected into intact animals suppresses cortisol in blood but enhances this transport of water and sodium by goldfish intestine, thus sharing with cortisol a specific mineralocorticoid action of glucocortioids on fish intestine.
TL;DR: The T (tumor) antigen from transformed mouse cells has been purified 400-fold and prominent polypeptides of molecular weights 85–90,000 and 70–75,000 resolved.
TL;DR: In this article, the authors have made some measurements on flysch beds belonging to the "gres d'Annot complex" and found that there are correlations between the orientation of anisotropy axes and of transport directions.
TL;DR: In this article, a linear extrathermodynamic relationship between structural parameters and retention data was established for a series of esters, ketones, aldehydes, alcohols and ethers.
08 Sep 1975
TL;DR: The results show that the acyl-CoA: monoglyceride and diglyceride acyltransferases are localized in the villus tips where the cells with a differentiated brush-border are concentrated.
TL;DR: In this article, the authors compute the overlap function and transverse momentum correlations in various versions of the multi-paripheral model and examine in particular how close to saturation is the bound for the pomeron slope recently derived by Krzywicki.
TL;DR: The conformation of the ribose‐phosphate unit for the four principal configurations of the sugar ring has been studied using the extended Hückel theory and the Lennard–Jones empirical potential to minimize the energy of this residue with regard to the structure of RNA.
Abstract: The conformational analysis by the Extended Huckel Theory of the deoxyribose-phosphate unit in the principal configurations of the sugar is discussed. The work is divided into three parts in order to determine the role of the different elements constituting such a unit. (1) The simultaneous study, for the four principal configurations of the sugar, of the possible ranges of the rotational parameters ψ and ϕ′ with P3 and P5 without their oxygen atoms. (2) The study of the influence of the oxygen atoms, situated on P3 and P5, on the rotations ψ and ϕ′ for the C3′endo and C2′endo sugar configurations. (3) The study of the influence of a nucleobase on the rotation ψ, and whether the oxygen atoms of the phosphate groups should be taken into account or not.
The results show the equivalences C3′endo ≃ C2′exo and C2′endo ≃ C3′exo; that the allowed angular ranges of our rotational parameters depend, in some degree on the chosen sugar configuration; and that the rotations ψ and ϕ′ appear as “quasi” independent. In addition, an energetic classification which, according to the Extended Huckel Theory, seems to show that the C2′endo sugar configuration is the most favored for our unit was established; it was shown that the introduction of the oxygen atoms has no influence on the rotation ψ, but on the contrary leads to a restriction of the possible range for the ϕ′ parameter; and it was determined that the influence of the adenine base fixed in its position of minimal energy (i.e., anti-conformation) on the rotation ψ, as a function of the presence or absence of the oxygen atoms, is relatively limited.
08 Sep 1975
TL;DR: On s'attaehera surtout & d6gager la miss en oeuvre d'un algorithms apr~s avoir pr@cis~ le probl@me inverse et the r6gularit6 des fonctionnelles.
Abstract: On s'int6resse & des probl~mes d'optimisation oGle eontrSle est un domeine de R n (" optimal design " cf DERVIEUX PALMERIO [ S ]et MURAT SIMON [ 15 ]] et cO Im fonctionnelle fair intervenir les valeurs propres d'un probl~me aux limites au lieu de la solution d'un probl~me bien pus@ (par exemple elliptique]. L'origins de ce genre de questions remonte & RAYLEIGH (1899] [ I~ ~ an passant par HADAMABD [ ~0 ] , GARABEDIAN [ 8 ] , KAC [ 12 ] On s'attaehera surtout & d6gager la miss en oeuvre d'un algorithms apr~s avoir pr@cis~ le probl@me inverse et la r6gularit6 des fonctionnelles.
TL;DR: In this article, the depolarised light scattering spectra of liquid pyridine were used to confirm the attribution of rotational diffusion constants proposed by Kintzinger and Lehn.
TL;DR: In this article, the electrical conductivity of NaDNA solutions under salt-free conditions at temperatures well below the melting point of DNA, using radio-frequency dielectric and noise measurements.
Abstract: We have studied the electrical conductivity of NaDNA solutions under “saltfree” conditions at temperatures well below the melting point of DNA, using radio-frequency dielectric and noise measurements A conductivity discontinuity is observed at a temperature well below that at which the usual denaturation processes and trans conformation may commence The radio-frequency permittivity also exhibits a discontinuity at the same temperature For the premelting phase, the conductivity versus temperature curves consist of two linear regions with a change in slope occurring at 23°C This effect is related to the behavior of the ionic sheath covering the DNA macromolecule The activation energy of the alternative current conductivity as well as that the equivalent noise conductivity results as 311 kcal/mole below and 408 kcal/mole
TL;DR: In this paper, the relationship between the retention data of ethers and those of other chemical populations was examined by a simple linear relationship, and the relationship retention parameters can be fairly accurately determined.
01 Jan 1975
TL;DR: In this paper, the behaviour of DNA as a polyelectrolyte has been considered in the simplest case, i.e., DNA dissolved in an aqueous 11 electrolyte and compensated by monovalent metallic counter-ions.
Abstract: The behaviour of DNA as a polyelectrolyte has been considered in the simplest case, ie DNA dissolved in an aqueous 11 electrolyte and compensated by monovalent metallic counter-ions
TL;DR: The activated form of the U-47 mutant of E. coli alkaline phosphatase is a dimer with 4g atoms of zinc per mole and its specific activity is only two-tenths that of the wild type enzyme.
TL;DR: Two UV emission bands have been found under UV excitation in hydrothermal synthetic calcite crystals at 347 and 385 nm as discussed by the authors, which can be explained in terms of transfer through the Auger effect toward a well-known center absorbing near 350 nm, which can now be described as a killer of luminescence in calcite at room temperature.
TL;DR: In this article, auteurs montrent comment on peut envisager le calcul des caracteristiques d'une ligne a meandre microbande (in milieu inhomogene) en utilisant une extension de la theorie des lignes de Kirchhoff.
Abstract: Les auteurs montrent comment on peut envisager le calcul des caracteristiques d’une ligne a meandre microbande (en milieu inhomogene) en utilisant une extension de la theorie des lignes de Kirchhoff. Dans une premiere partie, ils apportent des informations theoriques et numeriques sur les vitesses de propagation dans un systeme comportant plusieurs microbandes couplees. Les resultats sont donnes jusqu’a 5 bandes. L’ecart des vitesses croit sensiblement avec la constante dielectrique du substrat. Dans une deuxieme partie, ils donnent un exemple de calcul des caracteristiques d’un circuit a deux meandres (et donc trois lignes couplees) en tenant compte de ces ecarts de vitesse. Il apparait que l’allure de la courbe de temps de propagation de groupe se deforme considerablement si la ligne a meandre est mal adaptee.
TL;DR: In this article, a link between optimal levels of the three principal marketing mix instruments (price, promotion and product quality) and the development expenditures devoted to the quality improvement of a firm's existing product is forged.
Abstract: The purpose of this paper is to forge a link between optimal levels of the three principal marketing mix instruments—price, promotion and product quality—and the development expenditures devoted to the quality improvement of a firm's existing product. Using the latest operational marketing mix model which prescribes quantitatively what the optimal quality of a brand should be, a simple function relating this optimal quality to desirable development outlays is suggested and some of its implications are explored.
10 Sep 1975
TL;DR: Two particular aspects of this system, its usability and its portability are emphasized, and a comparison with some good competitive systems are given, and conclusions for future work are drawn.
Abstract: This paper presents a system for automating the production of compilers for programming languages. It emphasizes two particular aspects of this system, its usability and its portability. It also gives a comparison with some good competitive systems, and draws conclusions for future work. The system produces compilers written in the programming language Pascal, from a self-contained description of the language to be compiled. This description uses a notation similar to Backus-Naur form for the syntax, and semantic attributes and actions written in Pascal for the semantics. The system is written entirely in Pascal, and is in current use on several computers.