Showing papers by "University of Paris published in 1973"
TL;DR: In this paper, it was shown that the Dirichlet boundary value problem converges uniformly to the exact solution u if u ϵ W1,p (Ω), with p > n, and that ∥u−u h ∥ L ∞(Ω) = O(h) if uϵ W2,p(ϵ), with 2p > n.
489 citations
469 citations
TL;DR: In this article, the formal kinetics of systems involving kinetics control by the initial charge transfer step and/or secondary chemical reactions are derived for the following reaction schemes: first order deactivation, consecutive dimerization, e.g. disproportionation.
405 citations
TL;DR: In this paper, a convolution potential sweep voltammetry (CPSV) method is proposed for processing the data obtained by linear sweep voltageammetry, which consists in calculating directly from the experimental data the convolution integral of the current time function with the function t − 1/2.
403 citations
TL;DR: In this paper, the authors consider the problem of existence of solutions for stochastic Navier-Stokes equations, where the random elements are the initial value of the solution and forcing terms which may be white noise in time.
403 citations
TL;DR: Daunorubicin induces complete remissions in about 50% of patients with acute promyelocytic leukemia and long-term survivals are more frequent than in the other acute granulocytic leukemias.
308 citations
TL;DR: In this paper, the anomalous Hall effect in a two band semiconductor is treated by an elementary theory based on the use of an effective Hamiltonian in the conduction band.
Abstract: The anomalous Hall effect in a two band semiconductor is treated by an elementary theory based on the use of an effective Hamiltonian in the conduction band. Simple equations of motion for the position and momentum provide an obvious interpretation of the results. The theory is worked out for arbitrary frequency and d.c. magnetic field, and for a spin magnetization which is either stationary or resonant. The physical nature of the various terms that contribute to the anomalous current is discussed in detail, and it is compared to the various existing models (most of which prove to be incomplete).
224 citations
TL;DR: Fast moving proteins are mainly assigned to the renewal of various membrane components (synaptic vesicles, presynaptic and axolemmal plasma membranes, mitochondria, endoplasmic reticulum) whereas the slowly migrating proteins purvey mainly the replacement of the axoplasmi components and mitochondrial organelles.
215 citations
215 citations
TL;DR: Observation of this purified fraction of Torpedo electric tissue by both freeze-etching and negative staining reveals a lattice organization of particles which most probably correspond to the cholinergic receptor protein.
193 citations
01 Jan 1973
TL;DR: Ooids occur in many different environments in the Persian Gulf; blackened relict ooids are common at depths of 100 m in the center of the basin while others have been transported to desert environments up to 40 km from the shore as discussed by the authors.
Abstract: Ooids occur in many different environments in the Persian Gulf; blackened relict ooids are common at depths of 100 m in the center of the basin while others have been transported to desert environments up to 40 km from the shore. Most Holocene ooids occur in coastal areas in the S parts of the Persian Gulf in which they appear to be forming in a variety of settings. The most spectacular accumulations constitute tidal deltas associated with coastal barrier system in E Abu Dhabi. Other agitated environments include tidal bars situated in wide channels between islands (Yas and Bahrain) and the adjacent Arabian shoreline, and on open tidal flats and beaches in exposed embayments (Sabkha Matti). Although most ooids are forming in these agitated environments, significant quantities are forming within lagoons (Khor Odaid and Jebel Dhanna), and on the SE lee coast of Qatar Peninsula (Umm Said).
01 Jan 1973
TL;DR: The Persian Gulf is a marginal sea with an average depth of 35 m and a maximum depth of 100 m near its narrow entrance as mentioned in this paper, and its elongate bathymetric axis separates two major geological provinces, the stable Arabian Foreland and the unstable Iranian Fold Belt.
Abstract: The Persian Gulf is a marginal sea with an average depth of 35 m, and a maximum depth of 100 m near its narrow entrance. Its elongate bathymetric axis separates two major geological provinces — the stable Arabian Foreland and the unstable Iranian Fold Belt — which are reflected in the constrasting coastal and bathymetric morphologies of Arabia and Iran. The Persian Gulf has a gently inclined sea floor lacking “shelf edges” comparable with those of modern Caribbean carbonate provinces.
01 Jan 1973
TL;DR: Sediment composition, surface patterns, and vertical sequences vary laterally along the Trucial Coast depending on three major factors: orientation of the shoreline with respect to the onshore “shamal” winds; proximity to Qatar Peninsula, an up-wind barrier; and presence of the Great Pearl Bank coastal barrier as mentioned in this paper.
Abstract: Sediment composition, surface patterns, and vertical sequences vary laterally along the Trucial Coast depending on three major factors:
orientation of the shoreline with respect to the onshore “shamal” winds;
proximity to Qatar Peninsula, an up-wind barrier;
presence of the Great Pearl Bank coastal barrier.
TL;DR: In this paper, the role played by proton transfer reactions in the formal kinetics of electrohydrodimerization processes is discussed, and the effects of the protonations of the various basic species generated at the electrode or through solution electron transfers are considered successively.
TL;DR: In this paper, the theory of convolution potential sweep voltammetry is extended to the case of two consecutive equal Nernstian waves and a procedure for determining the standard potential separation for closely spaced and fused waves is derived and discussed.
TL;DR: In this article, the interference of solution electron transfer, as well as electrode electron transfer in radical-substrate electrochemical coupling mechanisms is studied as a particular case of the e.c. vs. disproportionation problem.
TL;DR: Ubiquinone has been suggested to be closely associated with the primary electron acceptor of bacterial photosynthesis, and the effect of substituents upon semiquinones physicochemical properties is discussed.
TL;DR: In this article, the potential separation between successive electron transfers in a series of di- and polynitro-compounds is measured using convolution potential sweep voltammetry as a function of temperature in acetonitrile and dimethylformamide.
TL;DR: Glycoproteins manufactured from labeled sugars in preganglionic nerve cell bodies are transported rapidly along the axons to nerve endings; one fraction accumulates mainly as components of synaptic vesicles and presynaptic plasma membranes; another one participates in the renewal of axolemmal glycoprotein.
TL;DR: The kinetics of colony-forming units of the bone marrow in mice were studied using a method involving the suicide of cells in vivo by 3H-TdR or hydroxyurea and it was shown that quiescent stem cells pass into the proliferative compartment.
TL;DR: In this paper, the adsorption of sulphur on the (111), (100) and (110) faces of platinum has been studied by LEED and Auger spectroscopy.
TL;DR: In this article, a high-resolution electron impact spectrometer using electrostatic monochromators and the cross-beam technique is described, and its constraction and use in measuring cross sections are discussed.
Abstract: A high resolution electron impact spectrometer using electrostatic monochromators and the cross-beam technique is described. Considerations related to its constraction and use in measuring cross sections are discussed. This instrament was used to obtain absolute values for differential and integral excitation cross sections of the n = 2 manifold states of helium at 29.2 eV, 39.2 eV and 48.2 eV. The results are presented and compared with currently available theoretical calculations. (auth)
TL;DR: In this article, a study of seismic wave propagation in the mantle beneath the New Hebrides island arc shows that the remarkable gap in seismic activity between deep and intermediate depth earthquakes at the northern part of the arc corresponds to a gap in the lithospheric slab descending beneath the arc: the deep earthquakes mark a detached piece of lithosphere.
Abstract: Study of seismic wave propagation in the mantle beneath the New Hebrides island arc shows that the remarkable gap in seismic activity between deep and intermediate depth earthquakes at the northern part of the arc corresponds to a gap in the lithospheric slab descending beneath the arc: the deep earthquakes mark a detached piece of lithosphere. Although observations for New Zealand deep earthquakes are ambiguous, other evidence suggests the detachment of lithosphere beneath New Zealand.
TL;DR: In this article, electron micrographs of the various molecular forms of acetylcholinesterase (as previously characterized) are presented, and a possible model of the subunit structure for the "native" forms: A, C and D are proposed to consist of identical tails associated with respectively one, two, and three tetramers.
Abstract: Electron micrographs of the various molecular forms of acetylcholinesterase (as previously characterized) are presented. The “globular” forms G and G' appear as tetramers, and dimers, respectively, whereas the “native” forms, A, C, and D show a structure “en grappe” where a cluster of globules (respectively 4, 6 to 8, and at least 10) is associated with a semi-rigid “tail”. The globules seem identical in all forms and probably represent the sub-units of the enzyme (Mw 60000—80000). The structures are 50 nm long in their greatest dimension; the tail is 2—3 nm thick and its visible part is longest in A and shortest in D; presumably part of it is masked by the head. These results explain our previous physico-chemical observations which had led us to propose that the native forms were asymmetric in structure. We discuss a possible model of the sub-unit structure for the “native” forms: A, C and D are proposed to consist of identical tails associated with respectively one, two, and three tetramers. This hypothesis provides a rationale for the occurrence of three well-defined “native” acetylcholinesterases, as well as for the derived “globular” forms, the dimer and the tetramer. We further propose that the interactions inside the structures are not equivalent for the two kinds of subunits: for example, one of them might be linked directly to the tail, the other only through the tetramer interactions.
TL;DR: In this paper, a new instability was observed in a smectic-A liquid crystal (CBOOA), submitted to a negative pressure across the layers, and the penetration length of de Gennes λ=(22±3) A.