Showing papers by "University of Nice Sophia Antipolis published in 1991"
TL;DR: It is concluded that fatty acids or fatty acid metabolites activate the aP2 gene and subsequently modulate its expression and the role of fatty acids in the regulation of adipose-related genes is investigated.
243 citations
TL;DR: The authors examined the effects of morphological overlap between prime and target in the masked priming paradigm and found that the prior presentation of a higher frequency morphologically related word facilitates target processing only to prefixed and not to suffixed targets and independent of whether the prime was a stem or another prefixed form.
216 citations
TL;DR: In this paper, the authors used plagioclase from dykes from the Taoudenni area (Mali) and two lava flows from Morocco to determine an age of around 200 Ma for this body.
168 citations
TL;DR: Progress achieved in the preparation and selection of new, better‐defined and faster‐excreted fluorocarbons, and better surfactants, improved emulsions, knowledge of structure/property relationships along with an improved understanding of the physiologic response to their administration have led to a second generation of highly concentrated, fluid and stable injectable oxygen carriers suitable for a broad range of clinical applications.
Abstract: The approval of Fluosol, a fluorocarbon emulsion for oxygenating the myocardium during the transluminal coronary angioplasty procedure, is a landmark in the field of injectable oxygen carriers, the so-called blood substitutes. This review discusses the advances made since this first emulsion was initially developed about 12 years ago. Attention is focused on the progress achieved in the preparation and selection of new, better-defined and faster-excreted fluorocarbons, and better surfactants, improved emulsions, knowledge of structure/property relationships along with an improved understanding of the physiologic response to their administration. These advances have led to the development of a second generation of highly concentrated, fluid and stable injectable oxygen carriers suitable for a broad range of clinical applications. Prospects for further progress and future generations of emulsions are also outlined.
152 citations
TL;DR: A comparative study of the performance of three alignment methods (the double-level method, a new time-delay estimation method based on normalized integrals, and matched filtering) is presented and an application of theThree alignment methods as a function of the SNR is proposed.
Abstract: A comparative study of the performance of three alignment methods (the double-level method, a new time-delay estimation method based on normalized integrals, and matched filtering) is presented. A real signal and additive random noise for several signal-to-noise ratios (SNRs) are selected to make an ensemble of computer-simulated beats. The relation between the standard deviation of temporal misalignment versus SNR is discussed. A second study with real ECG signals is also presented. Several morphologies of QRS and P waves are tested. The results are in agreement with the computer simulation study. Nevertheless, the power spectrum of the noise process can affect the results. Matched filter estimation has been tested in the presence of power line interferences (50 Hz), with poor results. An application of the three alignment methods as a function of the SNR is proposed. The new time-delay estimation method has been observed to be robust, even in the presence of nonwhite noise. >
146 citations
TL;DR: In this paper, the 40Ar39Ar method was used for the analysis of single biotite grains from the North Tregor Batholite (Armorican Massif, France).
125 citations
TL;DR: In this article, the problem of finding a smooth strictly convex function whose gradient maps one domain onto the other with Jacobian determinant proportional to the given function was solved under the technical condition n = 2.
Abstract: Given two bounded strictly convex domains of ℝn and a positive function on their product, all data being smooth, find a smooth strictly convex function whose gradient maps one domain onto the other with Jacobian determinant proportional to the given function. We solve this problem under the (technical) condition n = 2.
125 citations
TL;DR: Right truncal posterior right vagotomy and anterior lesser curve seromyotomy by videocoelioscopy is an efficient and elegant method of treating chronic duodenal ulcer, but it needs thorough experimental practice.
Abstract: We performed truncal posterior right vagotomy with lesser curve anterior gastric myotomy by videocoelioscopy on 10 patients (5 men and 5 women, ranging in age from 19 and 54 years, with a mean age of 32 years). All had a long history of chronic duodenal ulcer with a mean duration of symptoms of 3.8 years. The mean length of the operation was 60 minutes (range: 55 to 110 minutes). There was no morbidity, and all patients were discharged after 5 days. The acid secretion tests under basal conditions and under insulin stimulation preoperatively and 1 month postoperatively showed a mean decrease in the basal output of 79.3% and a mean decrease of 83.04% in the maximal output. The fibroscopic control at the second postoperative month showed a complete healing of the ulcer in nine patients and a residual ulcer scar in one. No patients had any abdominal complaints. Right truncal vagotomy and anterior lesser curve seromyotomy by videocoelioscopy is an efficient and elegant method of treating chronic duodenal ulcer, but it needs thorough experimental practice.
120 citations
109 citations
Journal Article•
TL;DR: Laroscopic appendectomy is associated with less cutaneous scarring and a more rapid return of intestinal function and normal activities, and in the authors' experience, these results are better than those obtained with classical surgery.
Abstract: The authors present a retrospective analysis of 465 pediatric laparoscopic appendectomies. The ages of these patients ranged from 3 to 16 years, with a mean age of 10 years. The diagnosis of acute appendicitis was based on one or more of the following: the initial or repeated physical examination, abdominal radiographs, leukocyte blood count, and ultrasonography. On gross examination, 90% of appendices appeared inflamed, while on microscopic examination, 93% showed evidence of acute inflammation. There was a 3.6% incidence of minor intraoperative incidents and a 3.0% postoperative complication rate with 1.3% of patients requiring a subsequent laparotomy or repeat laparoscopic procedure. There were no deaths. The advantages of laparoscopic appendectomy include easy and rapid localization of the appendix, regardless of its location, the ability to explore the entire abdominal cavity through the same laparoscopic portals used for appendix removal, the ability to lavage completely the contaminated peritoneal cavity, a reduction in the incidence of intraperitoneal abscesses, and a probable reduction in postoperative adhesions. In addition, laparoscopic appendectomy is associated with less cutaneous scarring and a more rapid return of intestinal function and normal activities. In our experience, these results are better than those obtained with classical surgery.
101 citations
TL;DR: The destribution of Merkel cells (MCs) in normal human skin and mucosa was studied using the mouse monoclonal antibody Troma‐1, reacting specifically with component 8 of the moll cytokeratin catalogue.
Abstract: The distribution of Merkel cells (MCs) in normal human skin and mucosa was studied using the mouse monoclonal antibody Troma-1, reacting specifically with component 8 of the Moll cytokeratin catalogue. The specificity of this antibody for MCs in human skin was assessed by double indirect immunofluorescence (IIF) and immunoelectron microscopy. Two-hundred and thirty 6-mm punch biopsies were obtained from 44 different sites from six human cadavers within 48 h post-mortem. IIF was performed with Troma-1 on EDTA-split epithelial sheets and the MCs were counted and the mean values per mm2 calculated for each site. Regions with greater than 50 MC/mm2 were the lips, hard palate, palms, finger pads, proximal nail fold, and dorsum of the feet. Three different patterns were observed in the epidermis or mucosa: MCs grouped in clumps, linear and arciform arrangements, and scattered MCs. In the hair follicles grouped MCs were observed in the bulb and scattered MCs were seen in the outer root sheath.
TL;DR: In this paper, the authors show that superluminous Stokes pulses of quasisoliton type and partial self-induced transparency for the pump can be obtained even with a cw-coupled pump wave.
Abstract: Nonstationary stimulated Brillouin backscattering in a large gain optical-fiber ring cavity laser exhibits superluminous Stokes pulses of quasisoliton type and partial self-induced transparency for the pump. Experimental evidences, comforted by numerical simulation of the three-wave coherent model taking the acoustic-wave dynamics into account, show that this class of long transients occurs even with a cw-coupled pump wave.
TL;DR: In this article, a model based on the calculation of forces between two particles in an effective medium was proposed to analyze the static yield stresses on magnetic suspensions as a function of the applied magnetic field.
Abstract: Static yield stresses are measured on magnetic suspensions as a function of the applied magnetic field. Two differents systems are used: One is an aqueous suspension of polystyrene spheres containing iron oxide inclusions and the second one is of ordinary polystyrene spheres dispersed in a ferrofluid. The experimental results are analyzed with the help of a model based on the calculation of forces between two particles in an effective medium. This model is discussed and tested against experimental measurements of forces on centimetric iron spheres placed in a magnetic field.
TL;DR: In this paper, the authors investigated various routes to bismuth(III) alkoxides and β-diketonate derivatives and showed that the thermal stability of the volatile precursors 1 and 2 is in favour of the alkoxide, while the high solubility of 2 is attractive for sol-gel purposes.
TL;DR: The timing and Ca2+ sensitivity suggest a role in the primary signal transduction events of fertilization, particularly phosphorylation on tyrosine in the sea urchin egg.
TL;DR: In this article, a tetrameric molecular species of Al[(μ-OiPr)2Al(OiP)2]3, consistent with earlier proposals and spectroscopic data, has been shown by X-ray diffraction, in the form of a crystalline solid of melting point 127°C.
TL;DR: A total of 185 development projects, extending over 106 km have been built along the 656 km of rocky shores of the Provence-Alpes-Cote d'Azur region.
TL;DR: The process of activation by fatty acids, rather than the expression of the aP2 gene, is unique to adipose cells, and activation of both genes appears not to be mediated by the CCAAT enhancer binding protein, a nuclear factor reported as transactivator of theAP2 promoter activity.
TL;DR: In this paper, the age of the alkaline massif of Harrat Hadan has been estimated at 27-28 Ma on feeder dykes and one lava flow of the massif, based on the assumed age partly deduced from the conventional K/Ar data of other alkaline volcanic massifs from Saudi Arabia.
TL;DR: In this article, the authors studied the transition that results from the loss of reflection symmetry (parity) and showed that observations made in several recent experiments appear to be signatures of this bifurcation.
Abstract: In a variety of one-dimensional nonequilibrium systems, there exist uniform states that may undergo bifurcations to spatially periodic states. The long-wavelength dynamics of these spatial patterns, such as an array of convective rolls or a driven interface between two thermodynamic phases, can often be derived on the basis of the symmetries of the physical system. Secondary bifurcations of these patterns may be associated with the subsequent loss of remaining symmetries. Here, we study the transition that results from the loss of reflection symmetry (parity) and show that observations made in several recent experiments appear to be signatures of this bifurcation. Most of the common features seen in the disparate experiments follow from the simplest Ginzburg-Landau equations covariant under the remaining symmetries. It is shown that nucleated localized regions of broken parity travel in a direction determined by the sense of the asymmetry, and the passage of a localized inclusion of broken parity leads to a change in the wavelength of the underlying modulated state, and leaves the system closer to an invariant wavelength. Such behavior is in close correspondence with the properties of ``solitary modes'' seen in experiment. When a system supports extended regions of broken parity, a boundary between those of opposite parity can be considered as a source or sink of asymmetric cells and a ``spatiotemporal grain boundary.'' The creation or destruction of cells at the interface is reminiscent of ``phase slip centers'' in one-dimensional superconductors. The simplest dynamics consistent with the symmetries are identical to those of the time-dependent Ginzburg-Landau equation for a superconductor in an applied electric field. The experimental observation of approximate length subtraction of colliding regions of broken parity follows from this analogy.
TL;DR: The main result is the Theorem 4.4 which transforms a deduction problem in a multi-valued logic to an equivalent problem about ideal membership in a polynomial ring.
TL;DR: In this paper, an Nd:MgO:LiNbO/sub 3/singlemode waveguide laser with an integrated intracavity electro-optic phase modulator is reported.
Abstract: Efficient operation of an Nd:MgO:LiNbO/sub 3/ singlemode waveguide laser with an integrated intracavity electro-optic phase modulator is reported. Pumping the monolithic device at 0.814 mu m and driving the modulator at the cavity roundtrip frequency resulted in the emission of a continuous train of mode-locked pulses at 1.05 mu m with 8 ps pulse width, 6.2 GHz repetition rate, and 250 mW peak power for 45 mW of absorbed pump power and 7 V RMS applied. >
TL;DR: The intermediate stage of sleep characterized by high-amplitude cortical spindles interspersed with slow waves and low-frequency theta rhythm in the dorsal hippocampus does exist in the rat, cat and mouse and seems to correspond to a transient functional isolated forebrain.
14 Apr 1991
TL;DR: The purpose of this work is to propose a new scheme for vectors quantization of wavelet coefficients based on lattice vector quantization, and the application of the D/sub 4/, E/sub 8/ and Barnes-Wall Lambda /sub 16/ lattices is investigated.
Abstract: An image coding scheme has been introduced by the authors (see IEEE ICASSP, p.2297, 1990). This scheme involves two steps. A biorthogonal wavelet transform is applied to the original image, and wavelet coefficients are then vector quantized using the LBG (Linde, Buzo and Gray, 1980) method. The purpose of this work is to propose a new scheme for vector quantization of wavelet coefficients. The proposed method is based on lattice vector quantization. The application of the D/sub 4/, E/sub 8/ and Barnes-Wall Lambda /sub 16/ lattices is investigated. These lattices are used to encode wavelet coefficients whose PDFs are close to Laplacian. A variable-length coding method is applied and the trade-off between distortion and optimal rate is investigated. Experimental results on the Lena image using the Lambda /sub 16/ lattice leads to a peak signal-to-noise ratio (PSNR) of 31.14 dB at 0.08 bpp. This result outperforms, to the authors knowledge, all other methods. Edges which are most of interest for image analysis are particularly sharp without any smoothing artefacts. >
TL;DR: In this article, the authors investigated all time-periodic solutions, not only spatially periodic ones, when a Hopf bifurcation occurs, and showed the existence of spatially quasiperiodic flows.
Abstract: For the problem of hydrodynamical stability in an infinite cylindrical domain, we investigate all time-periodic solutions, not only spatially periodic ones, when a Hopf bifurcation occurs. When reflection symmetry is present, we show the existence of spatially quasiperiodic flows. We also show the existence of heteroclinic solutions connecting two symmetrically traveling waves that stay at each end of the cylinders (“defect” solutions). The technique we use rests on (i) a center manifold argument in a space of time-periodic vector fields, (ii) symmetry and normal form arguments for the reduced ordinary differential equation in two dimensions (without reflection symmetry) or in four dimensions (with reflection symmetry), and (iii) the integrability of the associated normal form. It then remains to prove a persistence result when we add the higher-order terms of the vector field.
TL;DR: The results show that the rabbit myocardium does possess a Na+ /H+ exchanger protein homologous to the known human Na- /H- exchanger.
TL;DR: In this paper, the Santiago deformed belt is divided into three main segments, each one characterised by a particular tectonic style, and the deformation is related to a transpressional mechanism along the left lateral Oriente strike-slip fault.
TL;DR: It is expected that this pseudopeptide analogue will produce highly potent and long-lasting neurotensin-like effects in vivo, and preliminary experiments indicate that this is indeed the case.
TL;DR: In this paper, a new method using either an analytical or a boundary element inverse technique, is developed for measurement of local heat transfer coefficients, which is submitted to a given heat transfer coefficient angular profile on its outer radius and on an uniform temperature on its inner radius.
Abstract: A new method using either an analytical or a boundary element inverse technique, is developed for measurement of local heat transfer coefficients. The direct model calculates the temperature field inside a cylindrical pipe. This is submitted to a given heat transfer coefficient angular profile on its outer radius and on an uniform temperature on its inner radius. Experimental temperature measurements inside the cylinder are processed by two techniques. Their results are very close and coherent with those of other authors. Variation of the cylinder conductivity with temperature, implemented by the boundary element technique, seems to show that the averaging of its value yields a regularization effect.