showing 36 of ~574560 from 574555 documents
Limnología comparada de las lagunas de dos sistemas cársticos de Cuenca : "Bacterias fotosintéticas de la laguna de La Cruz y la laguna Arcas-2 =;""C…
1997
Role of Ischemia/Reperfusion Injury in Organ Transplantation
1997
Reperfusion of oxygenated blood into previously ischemic tissue is essential to prevent the progression of cellular injury due to the decreased nutritional blood flow, i.e., the decreased delivery of oxygen and metabolic substrates, as well as the removal of harmful metabolic byproducts. However, it has become obvious that reperfusion also initiates a complex series of pathologic events that contribute to, rather than prevent, further tissue damage. Moreover, a growing body of evidence indicates that ischemia/reperfusion injury is initiated by events that occur at the level of the microcirculation. In the first part of this overview, we will delineate the major components of the microcircul…
Mobile information systems - executives' view
1997
The concepts of travelling executive and executives' mobile information system are first defined in this paper. The main findings are in the form of collected data and opinions concluded from our personal discussions with 49 executives in the United Kingdom, France, Italy and Finland concerning the nature of the work of executives and the usage of information technology (IT) to support their work today. The near future expectations of the executives are also analysed, especially concerning the mobile use of IT services in order to construct executives' holistic view of mobile computing. The use of IT services was found to be very widespread. Big differences were found: some of the executive…
Substituent effects on the gas-phase basicities of4-x-acetophanes and 4-x-2,6-dimethylacetophenones: a comparison with solution basicities
1997
Abstract The behaviour towards gas-phase protonation of a series of 2,6-dimethyl-4-X-acetophenones DM1 exhibits strong similarities with that of the corresponding 4-X-acetophenones 1 . A comparison with previous basicity data in solution and AM1 semiempirical calculations suggest that the X-dependent rotation of the probe group out of the plane of the aromatic ring caused by the two ortho methyls is of minor importance in influencing the substituent effect on the gas-phase basicity of DM1 ; on the contrary, it could heavily affect the solvatability and thus be responsible for the observed behaviour of DM1 in strongly acidic media.
Dynamics of a Supercooled Lennard-Jones System: Qualitative and Quantitative Tests of Mode-Coupling Theory
1997
Using a molecular dynamics computer simulation we investigate the dynamics of a supercooled binary Lennard-Jones mixture. At low temperatures this dynamics can be described very well by the ideal version of mode-coupling theory. In particular we find that at low temperatures the diffusion constants show a power-law behavior, that the intermediate scattering functions obey the time temperature superposition principle, and that the various relaxation times show a power-law behavior. By solving the wave-vector dependent mode-coupling equations we demonstrate that the prediction of the theory for the wave-vector dependence of the nonergodicity parameters and the r-dependence of the critical amp…
Correlation between the effects of retinoic acid and dexamethasone on liver tyrosine aminotransferase
1997
A single dose of 50 microg of trans-retinoic acid administered to rats significantly raised the level of hepatic tyrosine after a few hours. This effect was compared with that of dexamethasone and a possible correlation between these effectors was also investigated. An equal increase in enzyme activity level caused by retinoic acid was observed in adrenalectomized rats, leading to the suggestion that the effect of retinoic acid on liver tyrosine aminotransferase is independent of glucocorticoids. However, the study of the binding activity of the liver nuclear glucocorticoid receptors vs dexamethasone showed that this activity is favoured by retinoic acid, whereas no variation was evidenced …
Early stage human colorectal cancer: prognostic value of nm23-H1 protein overexpression
1997
Nm23 gene codifies for a nucleoside diphosphate kinase allowing the intracellular transduction of the signals. In colorectal cancer nm23 protein expression seems related to the progression of the disease. By immunohistochemistry we have studied the intracytoplasmatic nm23 H1 protein expression in 20 patients affected by colorectal cancer at initial stage. In 12 cases it resulted elevated and in four the disease recurred. The overexpression was not correlated with other prognostic factors. Nm23 H1-positive patients affected by colorectal cancer at initial stage could be considered at risk for disease recurrence and included in a more frequent follow-up protocol.
Opettajien näkemyksiä itseohjatun oppimisen mahdollisuuksista ala-asteella
1997
Ajatukseni ovat maailmani rajat
1997
Käden sarjallinen motorinen oppiminen laululeikin avulla (3-4-v.)
1997
Rosi Braidotti, Degli insetti e delle Donne. Irigaray e Deleuze sul divenire donna
1997
El comercio exterior medieval en un emporio
1997
'Jos ei jotenki naksahda ni ei' : hoitajien ja diabeetikoiden näkemyksiä insuliinidiabeetikon oppaasta
1997
Liikuntaohjelman vaikutus sensomotoriseen oppimiseen
1997
Tavoitesuuntautuneisuus, itsearvostus ja suoritusahdistuneisuus hiihtourheilijoilla
1997
Ģeogrāfijas un Zemes zinātņu sekcija "Cilvēks. Vide. Resursi": tēžu krājums
1997
Cotilo recubierto con hidroxiapatita de la artroplastia Omnifit: resultados a medio plazo
1997
Las cúpulas acetabulares roscadas han mostrado malos resultados en períodos medios de evolución. Aunque la sujeción inmediata es excelente, con el paso del tiempo se ha comprobado la ausencia de fijación, mostrando un alto porcentaje de movilizaciones. Una alternativa para evitar esos fracasos es el recubrimiento de estos cotilos con hidroxiapatita. Hemos revisado clínica y radiográficamente 36 casos de artroplastias Omnifit con cotilo roscado y recubierto de hidroxiapatita, con un tiempo medio de seguimiento de 58 meses. Diez pacientes presentaban dolor en región inguinal. Sólo el 63,9% de los cotilos se encontraban radiográficamente integrados, habiendo sufrido una clara movilización seis…
Auteur, style et démiurgie dans dans la première période allemande de Lang
1997
On peut déduire de l'analyse du style cinématographique de Lang une conception idéologique dans un sens très large, qui joue dans les limites du chaos et du déterminisme. On reconnaît certes un coup de main pour contrôler le chaos, mais il n'est pas indifférent de remarquer que celui-ci se produit après coup. Il est facile d'en dégager une attraction étrange pour le chaos, aussitôt suivie de son évacuation radicale et ceci d'une manière qu'on pourrait qualifier de paranoïaque car elle aspire à ne pas laisser de trace. Enfin, cette idée parfois vague, parfois complète, s'empare de la mise en scène en s'appuyant soit sur la composition de l'image, soit sur l'organisation de l'espace, soit sur…
Andrew P. Debicki. Historia de la poesía española del siglo XX: desde la Modernidad hasta el presente
1997
El emporio comercial mediterráneo diseñado por David Abulafia para el reino catalán de Mallorca
1997
Los croquis y mapas del Reino de Valencia de López y Cavanilles: dos geógrafos y dos métodos opuestos
1997
El análisis de los mapas generales del reino de Valencia -ejecutados por Tomás López en 1762 y 1788 y por Cavanilles en 1795- muestra os resultados de dos métodos cartográficos opuestos basados respectivamente en encuestas por escrito y croquis de gabinete y en encuestas vivas y croquis sobre el terreno. Para ello, en primer lugar se caracteriza el método de Tomás Lopez a través de los rasgos fundamentales del interrogatorio y del mapa de 1788. Posteriormente se considera el método de Cavanilles basado en las panorámicas y croquis de campo y en encuestas vivas y su utilización en el mapa de 1795. Finalmente, se comparan seis espacios diversos de ambos autores.
The spin-dependent structure function g1(x) of the deuteron from polarized deep-inelastic muon scattering
1997
We present a new measurement of the spin-dependent structure function $g_{1}^{\rm d}$ of the deuteron from deep inelastic scattering of 190 GeV polarized muons on polarized deuterons. The results are combined with our previous measurements of $g_{1}^{\rm d}$. A perturbative QCD evolution in next-to-leading order is used to compute $g_{1}^{\rm d}(x)$ at a constant $Q^{2}$. At $Q^{2} = 10$ GeV$^{2}$, we obtain a first moment $\Gamma_{1}^{\rm d} = \int_{0}^{1} g_{1}^{\rm d}{\rm d}x = 0.041 \pm 0.008$, a flavour-singlet axial charge of the nucleon $a_{0} = 0.30 \pm 0.08$, and an axial charge of the strange quark $a_{s} = -0.09 \pm 0.03$. Using our earlier determination of $\Gamma_{1}^{\rm p}$, …
Distributed Systems for Fusion of Visual Information
1997
Reaction of melatonin with lipoperoxyl radicals in phospholipid bilayers.
1997
Melatonin, at 5 to 500 microM was incorporated in unilamellar soybean phosphatidylcholine (PC) liposomes, the peroxidation of which was induced by 2,2'-azobis (2-amidinopropane-hydrochloride) (AAPH), and measured as production of conjugated diene lipid hydroperoxides. Concentration as low as 5 and 10 microM were poorly effective in reducing lipid peroxidation. Melatonin at 30 to 500 microM caused short inhibition periods, increasing with, but not linearly related to concentration, with a concurrent net decrease of the propagation rate. The time course of melatonin oxidation, measured as loss of fluorescence, was studied during the AAPH-stimulated peroxidation of soybean PC liposomes, or whe…
Zaburzenia w mikrokrążeniu u chorych z zespołem antyfosfolipidowym
1997
Syömishäiriöriskit suomalaisilla urheilijoilla ja balettitanssijoilla
1997
Balttilainen vai skandinaavinen suuntaus? : Baltian asema Suomen ulkopolitiikassa vuosina 1925-1934
1997
Lapsen älyllinen kehitys ja musiikin keksiminen
1997
Ajallisuus ja kieli Hölderlinin Brot und Wein -runoelmassa
1997
Yksilöintegraatio musiikinopetuksessa : tapaustutkimus kehitysvammaisen oppilaan opiskelusta peruskoulun ensimmäisen luokan musiikinopetuksessa
1997
Tunnen mieleni, tunnen kehoni, tunnen tilani - tanssin! : eksistentiaalis-fenomenologinen näkökulma tanssiin kasvun tukijana
1997
A (p/E) calculations of strong pionic decays of baryons
1997
Strong pionic decays of baryons are studied in a non-relativistic quark model framework via a convergent (p/E) expansion of the transition operator. Results are compared to the ones obtained within a more conventional (p/m) expansion.
Señoríos y nobleza en la Baja Edad Media (El ejemplo de la Corona de Castilla)
1997
Neuronal circuitry in the medial cerebral cortex of lizards
1997
The medial cortex of lizards is a simple three-layered brain region displaying many characteristics which parallel the hippocampal fascia dentata of mammals. Its principal neurons form a morphologically diverse population, partly as a result of the prominent continuous growth of this nervous centre. By using the classical Golgi impregnation method we describe here the morphology of the principal neurons (8 types) and the short-axon interneurons (18 types) populating the medial cortex of Podarcis hispanica as well as the connections between them.
Differential calculus on 'non-standard' (h-deformed) Minkowski spaces
1997
Extractive-spectrophotometric determination of furosemide with sodium 1,2-naphthoquinone-4-sulphonate in pharmaceutical formulations
1997
ABSTRACT An extractive-spectrophotometric study based on the reaction of furosemide with 1,2-naphthoquinone-4-sulphonate (NQS) is described. Optimal conditions are: NaH2PO4-Na2HPO4 pH 7.5, NQS 7.7×...