showing 36 of ~574560 from 574555 documents
Age 4–5 Years
1993
Oral intake of cadmium, cobalt, copper, iron, lead, nickel, manganese and zinc in the university student's diet.
1993
A duplicate diet meal study was carried out with a group of university students living in a hostel, in order to estimate the intake of Zn, Cd, Co, Cu, Fe, Mn, Ni and Pb. Zn, Cu, Fe, Mn and Ni were determined by flame atomic absorption spectrophotometry and Cd, Co and Pb by graphite furnace atomic absorption spectrophotometry after a nitric acid wet digestion procedure. The estimated intake values from the contents of breakfast, lunch, dinner and drinks were compared with the values of the Provisional Tolerable Daily Intake (PTDI) in the case of Cd and Pb, Recommended Dietary Allowances (RDA) of Co, Fe and Zn and Estimated Safe and Adequate Dietetic Daily Intake (ESADDI) of Cu and Mn. Neithe…
Differentiation driven by granulocyte-macrophage colony-stimulating factor endows microglia with interferon-γ-independent antigen presentation functi…
1993
The antigen presentation function of microglial cells was analyzed after differentiation in neonatal mouse brain cell cultures supplemented either with macrophage (M) or granulocyte/macrophage (GM) colony-stimulating factor (CSF). The cells separated from concomitant astrocytes in both culture systems turned out to exhibit cytological characteristics of macrophages and bore MAC-1 and F4/80 markers in a similar way. When comparatively tested for accessory cell function, only microglia developed with GM-CSF were able to efficiently induce antigen-directed proliferation of a series of helper T cell lines representing both the TH1 and TH2 subtype. Antigenic T cell activation by this microglia p…
Production de gamma-decalactone par bioconversion
1993
Flow injection-spectrophotometric determination of cresol compounds in water by reaction withp-aminophenol
1993
A spectrophotometric method has been developed for the simultaneous determination ofo-cresol andm-cresol in water by reaction withp-aminophenol (PAP). Three different methodologies have been assayed; (i) batch analysis, after reaction in an alkaline medium in the presence of dissolved molecular oxygen as oxidizing agent, (ii) a stopped-flow procedure, carried out in the presence of KIO4 and (iii) a flow injection method based on the same approach. The batch procedure requires 22 min for the full development of colour witho-cresol and 12 min form-cresol. In the stopped-flow mode, using KIO4 and a reaction time of 12 min, better sensitivity can be obtained for both compounds and limits of det…
Coronary Artery Shape and Flow Changes Induced by Myocardial Bridging.
1993
Changes in coronary shape and blood flow induced by myocardial bridging were analyzed in a 56-year-old patient with symptoms of unstable angina after the exclusion of other heart disease. Coronary angiography demonstrated a 1.8-cm long myocardial bridge in the middle part of the left anterior descending coronary artery. In systole, an eccentric compression of the artery occurred, resulting in a stenosis that occupied 86% of the diameter and 96% of the area. Intraluminal ultrasound was performed with a 20-MHz transducer in a 4.8-Fr catheter sheath (Boston Scientific Corp.) connected to an ultrasound console (Diasonics Inc.). A side saddle catheter was introduced into the left anterior descen…
On a linear diophantine problem of Frobenius
1993
Abstract In this paper, linear diophantine problem of Frobenius is discussed. A theorem concerning the largest integer g m (a1,a2) and the smallest integer G m (a1,a2) with m different representations with a1,a2 as basis is proved.
Irreversible Multilayer Adsorption
1993
Random sequential adsorption (RSA) models have been studied due to their relevance to deposition processes on surfaces. The depositing particles are represented by hard-core extended objects; they are not allowed to overlap. Numerical Monte Carlo studies and analytical considerations are reported for 1D and 2D models of multilayer adsorption processes. Deposition without screening is investigated, in certain models the density may actually increase away from the substrate. Analytical studies of the late stage coverage behavior show the crossover from exponential time dependence for the lattice case to the power law behavior in the continuum deposition. 2D lattice and continuum simulations r…
Succession et remplacements de communautés à brachiopodes en régime de sédimentation discontinue (Jurassique Moyen, Bourgogne, France)
1993
Abstract Sequence stratigraphy throws a new and seminal light on the fossil record and helps in determining the respective role played by external control (community replacement) and internal control (paleoecological succession) in the temporal “train” of marine benthic paleocommunities. Five brachiopod-dominated communities (C1–C5) are recognized and their temporal “train” described, during the uppermost Bathonian-lower Callovian interval in Burgundy. The first series (C1–C3) exhibits a trend interpreted as a paleoecological succession and the next two (C3–C4, C4–C5) as community replacements. Within the scope of sequence stratigraphy, the paleoecological succession comes at the end of a t…
Assession Computer Use Impact within an Interactive Network of Variables : Assessing the Impact of Different Compunter Use in Mathematics Teaching an…
1993
International audience
Albuferas mediterráneas
1993
Historicism: Some Thoughts on "Life-World"
1993
Hace más de tres décadas, Walter Biemel leyó un documento en el Tercer Coloquio de Filosofía en Royaumont sobre "Las fases decisivas en el desarrollo de la filosofía de Husserl '' que parecía ser definitivo. A pesar de la gran utilidad de sus reflexiones y de los numerosos estudios que dedicó después al mismo problema, no es fácil de determinar cuáles son las diferentes etapas de la obra de Husserl. Esta dificultad se incrementa por la falta de una sincronía estricta entre las obras que el propio Husserl publicó y las que se quedaron sin publicar después de su muerte y han sido laboriosamente recuperadas por sus discípulos. En realidad, en los manuscritos pertenecientes a los momentos tempr…
La inserció de la minoria hebrea en la formació social valenciana
1993
Lingüística perceptiva y conversación: secuencias
1993
Se presenta la organización de las secuencias conversacionales a partir del modelo teórico de la lingüística cognitiva-perceptiva. Junto a a las secuencias de apertura y cierre conversacional (Secuencias marco), los cuatro niveles identificados por la teoría perceptiva (rección, concordancia, orden y énfasis) permiten identificar cuatro tipos fundamentales de secuencia conversacional (secuencias de historia, de concordancia, lineales y de inserción).
Age 15–17 Years
1993
Transmission of electrons through ferromagnetic material and applications to detection of electron spin polarization
1993
The salient features of the total low energy inelastic electron scattering cross section in transition metals are described by a constant term σ 0 plus a term σ d that is proportional to the number of unoccupied d-orbitals. This simple model predicts that low energy electrons transmitted through a ferromagnetic ultrathin film acquire a transport spin polarization a(x). Using the ratio σ 0 /σ d as the only adjustable parameter, the model predicts the enhancement of the spin polarization of the low energy cascade electrons as well as a(x) in reasonable agreement with the existing observations on Fe, Co and Ni. A detector for electron spin polarization P based on the spin dependent transmissio…
Search for Z0 decays to two leptons and a charged particle-antiparticle pair
1993
Based on a sample equivalent to 365 000 hadronic Z0 decays, the search in DELPHI data for pairs of leptons accompanied by a pair of charged particles is described. A total of 11 events were found in the electron channel, 9 in the muon channel and 7 in the tau channel. Results on lepton pairs with a radiated photon are also presented. The data from all channels are compatible with the expectations from standard processes. However, one event was found in the tau channel with an unusually high mass of the charged particle pair.
Didáctica de las ciencias experimentales y sociales
1993
Consideraciones que pueden resultar de utilidad sobre el 'sencillo ejercicio', tanto en el propio planteamiento, como en la resolución detallada. Se ha tratado de poner en evidencia lo rico y sencillo que resulta el análisis de este ejercicio, una vez familiarizados con el formalismo, en contraste con la complejidad, confusión y artificialidad, que siempre generan las simplificaciones apriorísticas; todo ello, mediante el estudio aparentemente simple de un movimiento; aspecto no trivial, el del estudio en movimiento, que está en el origen de la propia Física, desde los griegos. Para concluir, se expone la respuesta a estas consideraciones de J. Félix Fuertes, ya que el sencillo ejercicio no…
Los servicios avanzados como factor del desarrollo de la economía de la provincia de Castellón: localización y posibilidades de futuro
1993
Este artículo analiza el papel de los servicios avanzados en la economía local y sus implicaciones en el desarrollo económico futuro. El crecimiento del número de servicios a las empresas en la Comunidad Valenciana, el crecimiento de su mercado entre las pequeñas y medianas empresas y el interés demostrado por la Administración son algunos de los puntos que nos llevan a valorar la importancia de este tipo de actividades como factores de crecimiento económico, principalmente en regiones como Castellón con una industria muy competitiva y enormes posibilidades turísticas.
El modelo de Ausubel en la didáctica de la física: una aproximación experimental al proceso E/A de contenidos que presentan constructos poco elaborad…
1993
This paper shows the results of a research on physics education about «Magnetism» in secondary school. We investigate a constructivist approach to instructional design based upon Ausubel's model in the treatment of subjects on which pupils have poor conceptual representations and alternative frameworks. The first results with respect to inmediate and lasting learning, are shown.
El sistema tributario del Reino de Valencia durante el siglo XVI
1993
Peracarid Crustacea Inhabiting Aegagropylae of the Red Alga Rytiphloea Tinctoria (Clemente) C. Ag. in the Stagnone Sound, Western Sicily, Italy
1993
The peracarid Crustacea belonging to Cumacea, Tanaidacca, Isopoda and Amphipoda, inhabiting aegagropylae of Rytiphloea tinctoria were studied throughout a year in the Stagnone Sound (western Sicily, Italy). The dominant groups, tanaids (61.7%) and amphipods (32.8%), were represented by 6 and 28 species, and showed complementary trends during the 12 months, reaching their maximum of abundance in spring and autumn, respectively. Tanaids were mainly represented by Apseudes intermedius Hansen, 1895 and Parapseudes latifrons (Grube, 1864), and amphipods by Elasmopus pocillimanus (Bate, 1862), Leptocheirus guttatus (Grube, 1864), Lysianassa longicornis Lucas, 1849 and Maera inaequipes (A. Costa, …
The Chemistry of Unsaturated Nitrogen–Heterocyclic Compounds Containing Carbonyl Groups
1993
Publisher Summary Most hydroxy-substituted azaheteroaromatic compounds exist predominately in the NH/carbonyl tautomeric form, and these compounds have been widely discussed. This chapter provides an overview of azaheteroaromatic compounds and I-azetin-4-ones—these are those azaheterocycles that contain in the ring at least one carbonyl group and one or two nitrogen atoms in the form of C=N or N=N bonds. Many of these compounds are unstable but their importance as reactive intermediates is established, and many of them could be used as synthons in the preparation of pharmacologically active compounds. The chapter describes the free existence of I-azetin-4-one and the nucleophilic substituti…
Regularity and strong sufficient optimality conditions in differentiable optimization problems
1993
This paper studies the metric regularity of multivalued functions on Banach spaces, tangential approximations of the feasible set and strong sufficient optimality conditions of a parametrized optimization problem minimize The results are applied to the tangent approximations and the local stability properties of solutions of this perturbed optimization problem.
Notes d'un paleògraf a propòsit del matritensis 9750 de la Biblioteca Nacional (Curial e Güelfa)
1993
The thesis of Jaume Riera i Sans (1991), pretending that the text of the novel Curial e Giielfa contained in this ms. of Madrid's national Library was a modern forgery, kindled a lively controversy. After a thorough study of the handwriting, with special reference to the capital letters, Prof. Gimeno's reaches the conclusion that without the slighest possible doubt this ms. was written during the xvth century.
Diluted Heisenberg Ferromagnets with Competing Ferro- and Antiferromagnetic Interactions: Evidence for a New Universality Class?
1993
The site-diluted classical face-centered cubic (fee) Heisenberg model with exchange between nearest and (J nn > 0) next nearest (J nnn =-J nn /2) neighbors is studied by Monte Carlo simulations using the heatbath algorithm in conjunction with histogram reweighting techniques. Finite size scaling analysis suggests that the diluted system crosses over to a new type of critical behavior, different from that of the pure system, in contrast to the prediction of the Harris criterion. But this model possibly can explain related experimental findings in Eu x Sr 1-x S.
Reliabilität und Validität der Hamilton-Depressionsskala und ihrer Subskalen
1993
Die Mittelwerte und Varianzen der Globalsummenscores fur die 17-Item-Version und 21-Item-Version der HAMD (Tab. 19) liegen im Bereich der in anderen Studien angegebenen Normwerte fur depressive stationare Patienten (Baumann, 1975; Maier et al. 1984; Hedlund, 1979).
TheSCH9 protein kinase mRNA contains a long 5′ leader with a small open reading frame
1993
The SCH9 yeast gene, that was previously identified as a suppressor of cdc25 and ras1- ras2-ts temperature-sensitive mutants, encodes a putative protein kinase that positively regulates the progression of yeast cells through the G1 phase of the cell cycle. We have determined the structure of the SCH9 transcription unit, using primer extension and S1 mapping techniques. The corresponding mRNA included an unusually long 5' region of more than 600 nucleotides preceding the major open reading frame (ORF). While the latter corresponded to a protein of 824 amino acids, an upstream open reading frame (uORF) within the 5' leader could potentially encode a 54 amino acid peptide. To investigate the r…
Análisis estratégico del sector bancario español y estudio de las estrategias de crecimiento externo. Especial referencia a las cooperativas de crédi…
1993
Poder y sociedad durante el virreinato del duque de Calabria (1536-1550)
1993
Apparent content curves: new analytical applications
1993
Analytical possibilities of apparent content curves for ternary systems are studied. The mathematical method proposed is applied to UV-Vis spectrophotometric and fluorimetric techniques. Samples containing fluoresceine/eosine/acridine and methyl red/methyl orange/cresol red are resolved by fluorimetry and UV-spectroscopy, respectively. Results obtained are in agreement with the theoretical contents in both cases.
Effect of Torasemide — A New Cl--Transport Inhibitor on Glial Swelling by Lactacidosis and Glutamate
1993
Cytotoxic brain edema, i.e. swelling of glial- and nerve cells is a common result of cerebral ischemia, brain trauma, metabolic disorders, and develops secondarily in vasogenic edema. During ischemia and severe head injury, brain tissue homeostasis is severely changed, and many parameters are simultaneously affected. To dissect and isolate the causal mechanisms leading to swelling of nerve- and glial cells, our laboratory has established an in vitro model [4, 5]. Thereby pathomechanisms can be studied in isolation without interference of epiphenomena taking place in damaged brain tissue under circumstances of cerebral ischemia or trauma. In previous studies the role of acidosis in cell swel…
Endoventricular patch plasty improves results of LV aneurysmectomy.
1993
From May 1985 to December 1991 52 patients were operated upon for postischemic left ventricular aneurysm (LV-A). Between May 1985 and July 1989 25 patients (group I) with a mean age of 59 (46-72) years underwent conventional aneurysmectomy with direct closure of the left ventricle (LV) and a mean of 1.9 (0-3) additional bypass grafts (54% triple-vessel disease). The hospital mortality was 8% (2/25) and the late mortality during a median follow-up time of 34 months was 28% (7/25) with a 4-year survival of 66%. Improvement in the quality of life (NYHA from 2.6 to 2.1, P = 0.078) and global left ventricular ejection fraction (EF) (from 35 to 38%) proved to be unsatisfactory in conjunction with…
Formation initiale et orientation des jeunes filles
1993
International audience; Les filles s'orientent vers des filières scolaires plus restreintes que les garçons, et accèdent encore peu aux formations scientifiques. Ces itinéraires scolaires " sexués " ne sont pas dus à des différences d'aptitudes innées pour les matières scientifiques. La moindre réussite des filles en mathématiques semble surtout liée à des attitudes, qui se construisent au sein de la famille et de l'environnement social, et qui sont confortées par le caractère peu féminisé des professions scientifiques. Surtout, les filles anticipent, dans leurs choix d'orientation professionnelle, un besoin de " temps libre ", qui reflète la division des tâches au sein des couples, même si…