showing 36 of ~574560 from 574555 documents
Los cuentos de Onetti: la pregunta sobre el deseo
1995
On the Rifting Dynamics of Plate Divergence and Magma Accumulation at Oceanic Ridge Axes
1995
Rifting dynamics at spreading axes is governed by two processes: the large-scale plate divergence and the local magma accumulation in the crust-mantle transition layer. Both evolve simultaneously. A model is developed particularly for the situation in Iceland where a well studied rifting episode occurred in the Krafla volcanic system 1975–1984. Both the divergence and the buoyant rise of magma create tensile deviatoric stress in the axial region, but while divergence generates an altogether extensional stress field, uprising of buoyant melt produces tension only near the axis but compression of the sides. The buoyant rise is driven by the differential pressure gradient in rock and melt. The…
Is mathematics syntax of language?, II
1995
Around 1930 R. Carnap, H. Hahn and M. Schlick,1 largely under the influence of L. Wittgenstein, developed a conception of the nature of mathematics2 which can be characterized as being a combination of nominalism and conventionalism and which had been foreshadowed in Schlick’s doctrine about implicit definitions.3 Its main objective, according to Hahn and Schlick,4 was to conciliate strict empiricism5 with the a priori certainty of mathematics. According to this conception (which, in the sequel, I shall call the syntactical viewpoint) mathematics can completely be reduced to (or replaced by) syntax of language.6 I.e. the validity of mathematical propositions consists solely in their being c…
Differential display reverse transcription PCR reveals IL-1 induced gene expression patterns in human articular chondrocytes
1995
IL-1 exerts diverse effects on the metabolism of articular chondrocytes, including inhibition of proteoglycan synthesis and stimulation of matrix metallopro teinase synthesis. Therefore it is believed that IL-1 might play an important role in cartilage degradation in osteo- and rheumatoid arthritis. To improve our understanding of IL-1 induced effects on overall gene expression patterns of human articular chondrocytes, wc used a novel mRNA fingerprinting technique: Differential Display Reverse Transcription-PCR (DDRT-PCR) (Liang and Pardee 1992). The reported high sensitivity of this powerful technique promised to enable work with human articular cartilage, a tissue from which only small am…
Affine Hüllensysteme und affine Liniensysteme
1995
Im folgenden werden wir auf den Zusammenhang affiner Hullensysteme und affiner Liniensysteme eingehen.
Production of strange b-baryons decaying into xi-/+-l-/+ pairs at LEP
1995
An excess of events containing, in a jet, a same-sign Xi(-/+) - l(-/+) pair as compared to those with an opposite-sign Xi(-/+) - l(-/+) pair has been observed in an analysis of 1.7 million hadronic Z(o) decays collected by the DELPHI detector at LEP between 1991 and 1993 inclusive. The probability for this signal to come from non B-baryon decays is less than 5 x 10(-4). The measured production fraction corresponds to: P(b --> B - baryon) x BR(B - baryon --> Xi(-) l(-) X) = (5.9 +/- 2.1 +/- 1.0) x 10(-4), per lepton species, averaged for electrons and muons and assuming the two channels have an equal contribution. Semileptonic decays of Lambda(b) baryons can account for less than 10% of thes…
Essai de Modélisation du Comportement du Public de Théâtre : une Approche Conceptuelle et méthodologique
1995
Mercaderes moriscos en la Valldigna (Valencia): negocios, patrimonios y relaciones familiares
1995
Técnicas especiales en el diagnóstico de tumores óseos
1995
Se hace una exposición del valor actual desde el punto de vista diagnóstico y pronóstico de las técnicas especiales aplicables a los tumores óseos por el patólogo. En histoquimia se resalta el valor práctico de las técnicas de PAS y fosfatasa alcalina para el diagnóstico del sarcoma de Ewing y del osteosarcoma respectivamente. Se comenta el valor de la aplicación de la microscopía electrónica en el diagnóstico de los tumores de células redondas pequeñas (sarcoma de Ewing, tumor neuroectodérmico periférico, linfoma primitivo óseo y metástasis de neuroblastoma y de rabdomiosarcoma embrionario) y de los sarcomas fusocelulares (fibrosarcoma, leiomiosarcoma embrionario) y de los sarcoma fusocelu…
Game Theory and Mutual Beliefs
1995
Conventional facts are based on mutual beliefs which work as reasons for actions. The question remaining is: How can other peoples’ beliefs in something, which leads them to act accordingly, be a reason for someone else acting in a similar way? What is the compelling force of conventional facts noticed by Durkheim?
Graph Connectivity, Monadic NP and built-in relations of moderate degree
1995
It has been conjectured [FSV93] that an existential secondoder formula, in which the second-order quantification is restricted to unary relations (i.e. a Monadic NP formula), cannot express Graph Connectivity even in the presence of arbitrary built-in relations.
Compression of binary images based on covering
1995
The paper describes a new technique to compress binary images based on an image covering algorithm. The idea is that binary images can be always covered by rectangles, univocally described by a vertex and two adjacent edges (L-shape). Some optimisations are necessary to consider degenerate configurations. The method has been tested on several images representing drawings and typed texts. The comparison with existing image file compression techniques shows a good performance of our approach. Further optimisations are under development.
Pour le tourisme culturel. La Déclaration de Majorque: Présentation
1995
L'AQUILA REALE (AQUILA CHRYSAETOS). INDAGINE IN SICILIA.
1995
Évaluer les effets des stages pour publics "en difficulté" : réflexions à partir d'une étude de cas
1995
Synthesis of new cylindrical macrotricyclic molecules based on tetraazamacrocycle
1995
International audience
Una cultura de la fragmentación: pastiche, relato y cuerpo en el cine y la televisión
1995
El título de este libro presupone que la fragmentación es un signo de nuestros tiempos y, en particular, de sus formas culturales. Entre las diversas metáforas que se han utilizado para nombrar el gusto por el detalle, el despedazamiento y el fragmentarismo, una de ellas ha cosechado un éxito notable: "montaje". ¿Por qué, sin embargo, este libro, no acoge en su seno el término montaje? Aunque breve, la explicación es necesaria. Recordemos, entonces, el contexto de comienzos de siglo que vio nacer el concepto de montaje. Por una parte, unas formas artísticas que reaccionaban contra el organicismo y la imagen de unidad que ofrecían las obras clásicas; por otra, la irrupción violenta de la téc…
Un droit à géométrie variable
1995
International audience; Les dernières statistiques le confirment : ce n'est pas dans les entreprises où la formation est la plus développée que les efforts accomplis sont le mieux rémunérés. Reste que mieux vaut toujours être jeune, qualifié, de sexe masculin et employé dans une grande entreprise de haute technologie pour pouvoir bénéficier d'actions de formation.
Estudio clínico-experimental de la profilaxis en las endoftalmitis postquirúrgicas
1995
Purification and Characterization of Glutamine Synthetase Isoenzymes from Leaves and Roots of Brassica napus (L.)
1995
Summary The glutamine synthetase enzymes from leaves (GS2) and roots (GSR) of Brassica napus L. have been purified to homogeneity by the application of a three-stage isolation procedure comprising anion-exchange chromatography, adsorption by hydroxylapatite and gel filtration on Sephacryl 5-300 HR. The isoforms of the enzyme show a differential distribution in leaf and root tissues. Elution profiles of hydroxylapatite chromatography showed a distinct behaviour for GS proteins found in leaves and roots. Denaturing SDS-PAGE and Western blot experiments revealed molecular masses of approximately 43.5 and 40.5 kD for GS2 and GSR subunits, respectively. Moreover, kinetic properties determined us…
Causalidad en salud laboral: el caso ardystil
1995
ResumenEl establecimiento de relaciones causa-efecto ha sido y sigue siendo objeto de debate en epidemiología. La naturaleza observacional de la investigación epidemiológica dificulta el reconocimiento de estas relaciones. En este contexto, se han propuesto diferentes modelos para explicar las relaciones causales en los procesos de salud y enfermedad, desde el modelo determinista puro defendido por los postulados de Koch, que requiere la aceptación de relaciones unicausales, pasando por otras explicaciones que asumen la naturaleza multicausal de los problemas de salud en la población. En Salud Laboral se debe disponer también de modelos explicativos y criterios consensuados para valorar las…
A measurement of the \(\tau\) leptonic branching fractions
1995
Abstract: A sample of 25000 Z(0) --> tau(-)tau(+) events collected by the DELPHI experiment at LEP in 1991 and 1992 is used to measure the leptonic branching fractions of the tau lepton. The results are B(tau --> e nu) = (17.51+/-0.39)% and B(tau --> mu nu) = (17.02+/-0.31)%. The ratio of the muon and electron couplings to the weak charged current is measured to be g(mu)/g(e) = 1.000+/-0.013, satisfying e-mu universality. The average leptonic branching fraction corrected to the value for a massless lepton, assuming e-mu universality, is found to be B(tau --> l nu) = (17.50+/-0.25)%.
Influence of the parameters molecular structure and granularity on the compactibility of a powder
1995
Drug Dev. Ind. Pharm. ISI Document Delivery No.: RP128 Times Cited: 3 Cited Reference Count: 14 Andres, c ndiaye, a thomas, c tromelin, a chaillot, b pourcelot, y; International audience; The aim of this study was to determine whether it is possible to obtain better characterization of materials in order to find out if these one are suitable in Quality Assurance for direct tableting. We tried to show that a methodological approach combining chemical, physical and technological aspects could control the direct compression process. We chose orthoboric acid as a study model for the direct compression. From a chemical point of view, our findings show only one crystalline molecular structure (RX…
Cirugía funcionalizadora en la distrofia muscular progresiva (Enfermedad de Duchenne)
1995
Presentamos una serie de 55 pacientes afectados de Distrofia Muscular Progresiva (Enfermedad de Duchenne) de los cuales 22 fueron operados de los miembros inferiores con tecnoplastias de Aquiles principalmente, biopedestados en el término de 24 hs. y equipados ortodésicamente en la primera semana y que por término medio prolongaron su independencia de marcha por 20 meses. El criterio utilizado, mejoró notablemente la calidad de vida de estos niños postergando la aparición de complicaciones secundarias cardiorespiratorias y escolióticas. Ante la realidad de una carencia actual de medidas terapéuticas efectivas todo criterio funcionalizador en el tiempo, justifica a nuestro entender la acción…
Circolazione di élites nel Mediterraneo occidentale: le attività economiche degli Abravanel in Italia meridionale (1492-1543)
1995
When Deduction leads to Belief
1995
T h e paper questions the common assumption that rational individuals believe all propositions which they know to be logical consequences of their other beliefs: although we must acknowledge the truth of a proposition which is a deductive consequence ofour beliefs, we may not genuinely believe it. This conclusion is defended by arguing that some familiar counter- examples to the claim that knowledge isjustified true belief fail because they involve propositions which are not really believed. Beliefs guide conduct or issue in assertion by answering questions which arise in the course of deliberation and conversation, but the troublesome cases present proposi- tions which do not present the a…
Lipid peroxidation in tobacco leaves treated with the elicitor cryptogein : evaluation by high-temperature thermoluminescence emission and chlophyll …
1995
International audience
Zur Acetylierung von Spironolacton, Canrenon und 2-Methylencanrenon
1995
Bei der Umsetzung der Titelverbindungen mit Acetanhydrid und Acetylchlorid werden das 3,5-Dien-3-yl-acetat 2, die isomeren 2,4,6- und 3,5,7-Trien-3-yl-acetate 3 und 4 sowie das 2,4,6,8(14)-Tetraen-3-yl-acetat 7 erhalten. Hydrolyse von 7 liefert das 2α-Methl-8,14-didehydro-canrenon (9). 7 und 9 wurden auf ihre Bindungsfahigkeit gegenuber Hormon-Rezeptoren sowie den Serumproteinen SHBG und CBG gepruft: Die Substanzen erwiesen sich als inaktiv. Acetylation of Spironolactone, Canrenone, and 2-Methylene Canrenone Reaction of the title compounds with acetic anhydride and acetyl chloride yields the 3,5-dien-3-yl acetate 2 the isomeric 2,4,6- and 3,5,7-trien-3-yl acetates 3 and 4 as well as the 2,4…
Fractura luxación posterior de cadera asociada a fractura parcelar de la cabeza femoral: a propósito de un caso
1995
La asociación de luxación posterior traumática de cadera con fractura de la cabeza femoral, es relativamente poco frecuente. Presentamos un varón de 33 años de edad que sufrió un accidente vial con resultado de luxación posterior asociada a fractura de la cabeza femoral craneal a la fovea centralis (tipo II de la clasificación de Pipkin). El tratamiento realizado fue una reducción abierta sin osteosíntesis, dentro de las seis primeras horas. A los dos años el paciente camina con mínina claudicación y sin dolor. El ultimo estudio radiográfico realizado no muestra signos de necrosis cefálica. Pensamos que en estas lesiones, cuando la reducción cerrada no es posible, la realización de una redu…
Metal substitution in blue copper proteins : chemical and structural properties of cobalt and nickel azurins = Sustitución metálica en proteínas azul…
1995
Causal diagrams for empirical research
1995
n-arguesische affine Räume
1995
Unter Verwendung gewisser Reichhaltigkeitsbedingungen und Schlieβungssatze werden wir in diesem Paragraphen punkttransitive Translationsmengen und maximal transitive Mengen von o-Streckungen konstruieren, um dann im Ruckgriff auf Satz 10 einen algebraischen Darstellungssatz fur bestimmte n-arguesische affine Raume zu erzielen.
Effects of substitutions on cyclopentadienyl rings in complexes with molybdenum-mercury bonds. 95Mo and 199Hg NMR studies
1995
NMR data for 95Mo and 199Hg nuclei have been obtained for new di- and trimetallic complexes Cp′(CO)3MoHgX containing molybdenum-mercury bonds and bulky and/or potentially bifunctional substituted cyclopentadienyl ligands; Cp′=C5HMe2Ph2, C5Me4Bz, C5Bz5, C5H4PPh2 and C5Me4PPh2 (Bz=CH2C6H5; Me =CH3; Ph=C6H5); X=Cp′(CO)3Mo, Cl, Br, 1, SCN. They are discussed within the context of our earlier results reported for analogous complexes with the cyclopentadienyl ligands bearing methyl groups. With the exception of phenyl substituted rings, a rather narrow range of 95Mo chemical shifts is found for the compounds with the same number of different substituents on cyclopentadienyl ligands. An outstandin…
Kaon Photo- and Electroproduction on Nucleons
1995
We extend previous models of kaon photo- and electroproduction in order to include all six isospin channels. It is found that the inclusion of the few available data for the reactions γp → K 0 Σ − in the fit leads to drastically reduced Born coupling constants g Λ and g Σ . The result suggests the need to include hadronic form factors in a gauge invariant fashion. It is also shown that the K 0 form factor can be seen in K 0 Λ electroproduction.
Domain formation in monolayers
1995
For phospholipids at the air/water interface we demonstrate that molecular chirality in some, but not in all, cases influences the domain shapes. In other cases chirality in the head group region can cause a chiral structure considering the tail arrangement. This indicates head group ordering. Minute changes of the molecular structure may change domain morphology from circular to dendritic. This can be related to slight changes of the lattice structure. In case of a dendritic domain the chains are more tilted, the deviation from hexagonal symmetry is more pronounced, and hence the lattice anisotropy is larger. This can be understood also in view of recent simulations considering diffusion-l…
Dopamine agonists in schizophrenia: a review.
1995
Although it is unlikely that the different types of course and severity of schizophrenia are caused by one neurochemical abnormality alone, indirect pharmacological evidence still suggests a relative excess of dopaminergic activity being implicated in the pathogenesis of most of the schizophrenic symptoms, e.g. positive symptomatology. Synthesis and release of dopamine as well as firing rates of dopaminergic neurons are controlled by stimulation of autoreceptors via a negative feedback regulation. Investigations on therapeutic effects of autoreceptor-nonselective dopamine agonists in schizophrenia have yielded inconsistent results. Dopamine autoreceptor agonists like pramipexole, roxindole,…