Showing papers by "Paul Sabatier University published in 1979"
TL;DR: The inverse relationship between the accumulation of hydroxyproline-rich glycoproteins and the ability of the pathogen to develop in the host has been checked by the quantification, in infected tissues, of glucosamine, a characteristic component of chitin-containing fungi.
Abstract: Enrichment of the cell wall in hydroxyproline-rich glycoprotein is involved in the defense of muskmelon ( Cucumis melo ) seedlings to Colletotrichum lagenarium , the causative agent of anthracnose. The extent to which this accumulation proceeds may be experimentally modified by treating plants with ethylene or growing them in the presence of free l- trans -hydroxyproline. It appears that the increase in the wall hydroxyproline-rich glycoprotein mediated through ethylene is paralleled by an increasing resistance of the host to the pathogen. Inversely, inhibiting the synthesis of this glycoprotein in diseased plants is strictly correlated to an accelerated and more intense colonization of the host by the pathogen. In both cases, the inverse relationship between the accumulation of hydroxyproline-rich glycoproteins and the ability of the pathogen to develop in the host has been checked by the quantification, in infected tissues, of glucosamine, a characteristic component of chitin-containing fungi.
195 citations
TL;DR: Fuzzy concepts are shown to be very useful and easy to work with in this decision-aid problem where it seems interesting to use fuzzy sets.
192 citations
TL;DR: A logical calculus is developed with propositions taking their truth values in the set of fuzzy sets of [0, 1], an extension of already known multivalent logics, and the associated set theory is shown to be that of fuzzy Sets of type 2 on a given universe.
Abstract: A logical calculus is developed with propositions taking their truth values in the set of fuzzy sets of [0, 1]. This fuzzy-valued logic is an extension of already known multivalent logics, and the associated set theory is shown to be that of fuzzy sets of type 2 on a given universe. Various interpretative functions are given for the usual connectives of propositional calculus, using extended “max” and “min” operators. Examples of inference are provided and a compositional rule for fuzzy-valued fuzzy relations is suggested. Computations of truth values for composite propositions are shown to be very easy. It is hoped that such a logic will be helpful in the modelization of approximate reasoning, in natural language.
159 citations
TL;DR: In this article, a new crystallochemical principle was proposed which allows a coherent description of the A-low temperature form, the H and the X forms, resulting from a partial oxygen disorder can be assumed either by a static or dynamic model.
159 citations
TL;DR: The hydroxyproline-rich glycoproteins secreted into the wall as a result of the disease are similar to those of healthy plants, and the extent of glycosylation of the wall serine decreases as the plant ages.
Abstract: Infection of muskmelon Cucumis melo seedlings by the fungus Colletotrichum lagenarium causes a 10-fold increase in the amount of cell wall hydroxyproline-rich glycoprotein Evidence for this increase was provided by studying two specific markers of this glycoprotein, namely hydroxyproline and glycosylated serine The lability of the O-glycosidic linkage of wall-bound glycosylated serine in the presence of hydrazine, was used to determine the amount of serine which is glycosylatedA large increase in the hydroxyproline content of infected plants is shown, but the ratios of glycosylated serine to hydroxyproline are similar in healthy and infected plants As far as these markers are concerned, the hydroxyproline-rich glycoproteins secreted into the wall as a result of the disease are similar to those of healthy plants In addition, the extent of glycosylation of the wall serine, in both healthy and infected plants, decreases as the plant agesSerine- and hydroxyproline-rich (glyco)peptides were also isolated after trypsinolysis of the wall These (glyco)peptides include the galactosyl-containing pentapeptide, serine-hydroxyproline(4) This pentapeptide is characteristic of cell wall protein
94 citations
TL;DR: An ultrastructural study of the intestinal absorptive epithelium in perch (Perca fluviatilis) has shown that the perch intestine can be divided into three segments: the proximal segment, the middle segment and the distal segment.
Abstract: An ultrastructural study of the intestinal absorptive epithelium in perch (Perca fluviatilis) has shown that the perch intestine can be divided into three segments: the proximal segment, the middle segment and the distal segment. The enterocytes of the proximal segment are found to be concerned with lipid absorption. The adsorbed fat gives rise to the presence of two forms of inclusions: lipid particles and lipid droplets. Enterocytes of the middle segment exhibit the typical ultrastructural features of pinocytosis; these consist of extensive invaginations of the luminal surface membrane and acculation of vacuoles in the apical cytoplasm. Exogenous proteins are ingested by absorptive cells from the intestinal lumen by a process similar to that described in neonatal mammals. In the distal segment the absorptive cells have few, short microvilli. Besides the absorptive epithelial cells, goblet cells, endocrine cells, pear-shaped cells, and plasma cells are occasionally found.
73 citations
TL;DR: All three carbamates caused a significant decrease in the activity of AchE in most maternal and fetal tissue samples examined 1 hr after treatment, and the decrease was generally more prominent in fetuses than in dams.
64 citations
63 citations
TL;DR: Observations do not support the proposal that the cAMP-CRP complex could stimulate transcription via some "melting" property unless its interactions be dramatically changed when it binds specifically to promoter DNA.
Abstract: The cyclic adenosine 3',5'-monophosphate receptor protein of Escherichia coli (CRP) binds cooperatively to single- and double-stranded DNA. Binding data could be fitted to the model of McGhee and von Hippel (1) and show that neither strandedness of DNA, nor the effectors cAMP and cGMP or the ionic strength (KCl) do change appreciably the cooperativity parameter omega (omega approximately or equal to 100), and site size of DNA. Instead, distinctly different slopes were observed for the linear decrease of log K omega (a measure of the overall affinity) as a function of log (K+). From these double-log plots (2), the number of cations released and the non-electrostatic contributions to the binding free energy could be determined. Binding of CRP to single-stranded DNA is slightly favored under physiological ionic conditions (0.15-0.20 M), but such a preferential binding is almost abolished in the presence of cAMP which increases the strength of the interaction of the protein with both forms of DNA. CGMP does not change the binding properties and interactions of CRP with DNA. These observations do not support the proposal that the cAMP-CRP complex could stimulate transcription via some "melting" property unless its interactions be dramatically changed when it binds specifically to promoter DNA.
49 citations
TL;DR: Among six cyclophosphazenes tested for antitumour activity against mouse P388, L1210 and B16 tumours respectively, activity was shown by the hexaziridino trimer compound, N3P3Az6, which has the advantage of high water solubility and activity both by the i.p.v. route.
48 citations
TL;DR: The authors report finding the target of JH action during caste determination, which seems that inPheidole pallidula the eggs are caste biased; this depends on the JH rate in the queen during oogenesis.
Abstract: Ce travail a pour objet l'identification de la cible de l'hormone juvenile lors du determinisme de la caste.
TL;DR: In this article, the influence of the bridges on the basicity of the metal-metal bond in Fe 2 (μ-A)(μ)-A′)(CO) 4 L 2 complexes has been checked.
16 Jul 1979
TL;DR: The aim of the present paper is to show that in some cases the semantic and functional equivalences coincide.
Abstract: Both (operational or denotational) semantics and type theories for λ-calculus induce in a natural way equivalence relations between terms. The aim of the present paper is to show that in some cases the semantic and functional equivalences coincide.
TL;DR: The role des deformations tectoniques ulterieures dans la reconstitution paleogeographique and l'influence du bâti structural antecretace sur la repartition des depots sont discutes as discussed by the authors.
TL;DR: It has been observed that estradiol stimulates nucleoside incorporation; the effect on cell division was not significant and in contrast estrone depressed significantly both cell division and nucleosides incorporation.
TL;DR: In this paper, the Moller-Plesset definition of the zeroth order Hamiltonian and the Epstein-Nesbet perturbation were used to calculate the intermolecular energy between two identical subsystems from a preliminary SCF calculation of the supersystem.
Abstract: The intermolecular energy between two identical subsystems may be calculated from symmetrydelocalized MO's resulting for instance from a preliminary SCF calculation of the supersystem. Then each second-order energy correction mixes intramolecular correlation,R
−6 intermolecular dispersion energy, andR
−3 components. TheR
−3 components disappear through subtle cancellations. The shifted Epstein-Nesbet energy denominators introduce an artificial second-order intermolecularR
−1 component, which would be cancelled by off-diagonal third-order terms, as well as a bad asymptotic limit at infinite distances. TheR
−1 artifact will also occur in strong symmetrical chemical bonds calculated in the Epstein-Nesbet perturbation scheme from delocalized MO's. These defects will occur in all variational approximate CI techniques which neglect off-diagonal elements between delocalized doubly excited determinants. These artifacts are avoided when using the Moller-Plesset definition of the zeroth order Hamiltonian or when starting from (SCF)localized MO's (even in the Epstein-Nesbet perturbation). The discussion is exemplified on an accurateab initio calculation of the Ar2 molecule.
TL;DR: For a ground-level continuous release of a trace substance like 222Rn, for which the vertical profile of concentrations is exponential, a quantity, "equivalent mixing height" h, is defined in this article in the following way.
Abstract: For a ground-level continuous release of a trace substance like 222Rn, for which the vertical profile of concentrations is exponential, a quantity, ‘equivalent mixing height’ h, is defined in this paper in the following way. If the substance were to be redistributed uniformly through a layer such that the concentration were to be equal to that at the surface, then the top of the layer would be h.
TL;DR: In this paper, twenty spirophosphoranes bearing a P-H bond have been obtained by the reaction of α-hydroxyacids or alkyl tartrates on tricoordinated phosphorus compounds.
Abstract: About twenty spirophosphoranes bearing a P–H bond have been obtained by the reaction of α-hydroxyacids or alkyl tartrates on tricoordinated phosphorus compounds. The stereochemistry is described. Intra- or extracyclic carbonyl groups, especially in the case of two identical ligands, increase the Lewis acid character of the phosphorus atom. Une vingtaine de spirophosphoranes a liaison P–H ont ete prepares en faisant reagir des α hydroxyacides ou des tartrates d'alcoyle sur des substrats a phosphore tricoordine convenables. L'etude stereochimique systematique de ces composes est decrite. La presence des groupements carbonyle a pour influence de renforcer le caractere d'acide de Lewis de l'atome de phosphore, notamment dans le cas des composes contenant deux ligands identiques, que le carbonyle soit intra ou extracyclique.
TL;DR: In this paper, evidence for fast oxygen diffusion in the H and X high temperature phases of La2O3 was presented from neutron diffraction background analysis and neutron quasielastic scattering data.
Abstract: 2014 Evidence for fast oxygen diffusion in the H and X high temperature phases of La2O3 is presented from neutron diffraction background analysis and neutron quasielastic scattering data. In the X phase at 2160 °C the translational self diffusion coefficient is of the order of 3 x 10-5 cm2/s and the mean time between jumps on neighbouring tetrahedral sites is around 1.4 x 10-12 s. These are typical values for good superionic conductors. LE JOURNAL DE PHYSIQUE TOME 40, OCTOBRE 1979, Classification Physics Abstracts 66.30H 61.12
TL;DR: Complexed dialkylgermylenes R2GeNR3 or R2GNCP react with oxiranes or thiirane and lead to dialklermanone and germathione via germaoxetanes or germathiacyclobutane as mentioned in this paper.
Abstract: Complexed dialkylgermylenes R2GeNR3 or R2GePy react with oxiranes or thiirane and lead to dialkylgermanone and germathione via germaoxetanes or germathiacyclobutane. The formation of germadioxolanes or germadithiolane finally observed arises from condensation of dialkylgermanone (or germathione) on oxiranes (or thiirane).
TL;DR: The first 2-silaphosphetane was synthetized by reaction of butyllithium with a β-chlorosilylphosphine, followed by intramolecular cyclisation.
TL;DR: In this article, a sedimentological and structural study of Permian and Triassic basins, Pyrenees (France, Spain), and their underlying Variscan substrate has been made in conjunction with model experiments.
TL;DR: In this article, the existence d'une fonction basique portee en bout de chaǒne par un ligand branche sur un atome de phosphore pentacoordine a permis de mettre en evidence un equilibre entre la forme penta and the forme hexcoordinee.
TL;DR: In this article, a method of numerical integration is presented which makes it possible to predict the form of interference fringes observed when holographic interferometry is used to study boundary layers.
TL;DR: In this article, the six lowest states, dissociating into the (2P)Al(4S)N and (2D)N atomic states, are calculated using a nonempirical pseudopotential for the representation of the atomic cores and an extensive CI.
TL;DR: The decouverte dans les “Marnes d'Auzas” du Maestrichtien superieur des Petites Pyrenees, d'une association de Clavatoracees comprenant Septorella brachycera et S. ultima constitue un premier element de comparaison entre le Cretace superieurs de cette region and celui de Provence; elle pose un probleme en ce qui concerne la subdivision du Rognacien provencal fondee, en
TL;DR: In this paper, the authors show that tomato plants with precursors of aromatic metabolism lead to an important increase in IAA content, which is directly caused by the accumulation of phenolic compounds which occurs in parallel.
TL;DR: The male Brachyptera braueri first introduces his epiproct into the vagina and after a long phase of stimulation, he deposits a spermatophore externally externally.
Abstract: Le mâle de Brachyptera braueri introduit d'abord son epiprocte dans le vagin. Apres une longue phase de stimulation, il depose un spermatophore externe. Chez les Brachyptera, il existe une correlation interspecifique entre la longueur des filaments de l'epiprocte et du flagelle du paraprocte droit des mâles et la longueur du canal du receptacle seminal des femelles. Les œufs de B. braueri eclosent au bout de trois a sept semaines. Ceux de Periodes microcephalus eclosent soit deux a cinq mois apres la ponte, soit un an apres. La chetotaxie des premiers stades larvaires des deux especes est decrite et figuree en detail. Les transformations evolutives du stade I et de l'adulte montrent un curieux paral lelisme, a la fois pour les cerques des Nemouroidea et les pieces buccales des Subulipalpia. Mating, incubation period of the eggs, and first larval stages of Brachyptera braueri and Periodes microcepbalius (Plecoptera). The male Brachyptera braueri first introduces his epiproct into the vagina and after a long phase of stimulation, he deposits a spermatophore externally. In the genus Brachyptera, there is an interspecific correlation between the length of the filaments of the epiproct and the flagellum of the right paraproct of the males and the length of the canal of the seminal receptacle in the females. The eggs of B. braueri hatch at the end of 3 - 7 weeks, whilst those of Periodes micro cephalus hatch either 2 - 5 months after oviposition or one year after. The chaetotaxy of first-instar larvae of both species is described and illustrated in detail. The evolutional transformations of the first larval stage and the adult show an interesting parallelism, together with the cerci of the Nemouroidea and the buccal parts of the Subulipalpia.
TL;DR: In this paper, the dicoordinated compounds have been stabilized by complexing with Lewis acid and isolated, and a thermodynamic equilibrium has been achieved for trico-ordinated phosphorus compounds (i.e., benzodiazaphosphole ⇄cyclotetraphosphazane) with a constant temperature.