showing 36 of ~574560 from 574555 documents
El pluralismo médico en la Valencia foral: Un ejemplo de curanderismo
1994
Ciegas esperanzas
1994
Intern conflicts and a production function with combining sub-factors
1994
Considering sub-factors, like different categories of capital or different categories of work, a production function is proposed: each sub-factor of one factor may be combined with each sub-factor of the other factor. Different types of programs exists at different levels. The conditions to obtain identical solution for these programs are studied. Considering that there is one responsible manager by program, conflicts between managers of each program arepossible because these programs give non identical solutions in general. The important fact is that these intern conflicts appear naturally without extra economical considerations
Beatriz Miami
1994
Parameter Sensitivity and the Quality of Model Predictions
1994
Using SIM-PEL, a comprehensive model for the pelagic compartment of lake ecosystems, we analyse synergistic toxicant effects in lake ecosystems. We show, that — even for a rather simple model — model predictions may be strongly dependent on the time horizon of the prediction and on the quality of input parameters. For longer time spans, small errors in parameter estimation may lead to qualitatively wrong prediction of toxicant effects. Monte Carlo simulations allow to take errors in parameter estimation into account, but they need rather good estimates of parameter variance.
U-Pb zircon and Sm-Nd dating of Moldanubian H P /H T granulites from South ohemia, Czech Republic
1994
Conventional multigrain U-Pb systematics of zircon and single-grain evaporation data of zircons in combination with Nd model ages are presented for pyroxene-free, felsic, garnetiferous granulites and orthopyroxene-bearing granulites of felsic, mafic and intermediate composition from the Blansky Les mountains granulite complex, S Bohemia. Zircons from mafic and intermediate granulites yield Concordia intercept ages between 346 ± 5 and 351 ± 6 Ma as well as a single-grain evaporation age of 346 ± 12 Ma. These ages define the time of Variscan high-grade metamorphism in S Bohemia and are supported by an internal Sm-Nd garnet-zircon-plagioclase-whole rock isochron age of 343 ± 21 Ma. Euhedral zi…
Premier exemple de multi-immunodosage simultané de deux haptènes par la méthode CMIA (carbonyl metallo immunoassay)
1994
Resume Nous avons recemment mis au point un nouvel immunodosage non isotopique, appele carbonyl metallo immunoassay (CMIA) qui utilise comme traceur des complexes organometalliques et comme methode de detection l'infrarouge a transformee de Fourier (IR-TF). Cet immunodosage a deja ete decrit pour un medicament antiepileptique, le phenobarbital et une hormone steroide endogene, le cortisol. Nous decrivons ici l'extension de ce dosage CMIA au cas de deux autres medicaments antiepileptiques, la diphenylhydantoine (DPH) et la carbamazepine (CBZ). Pour ces deux medicaments, nous avons tout d'abord synthetise des immunogenes specifiques qui nous ont permis d'obtenir des anticorps polyclonaux anti…
Prediction of Ductile Fractures in Metal-Forming Processes: an Approach Based on the Damage Mechanics
1994
The Authors propose a new approach for the prediction of ductile fractures in bulk metal forming processes: the approach is based on a numerical analysis able to take into account damage occurrence and evolution in constitutive equations. The model supplies the distribution of the void volume fraction in the workpiece during the deformation path: consequently, the comparison to a critical value, determined by means of a simple tension test, allows to predict the growth of defects. The proposed approach has been applied to the drawing process: the numerical results have been compared with a set of experimental tests showing a good predictive capability of the model.
Estatua con palomas
1994
La serie iconográfica franciscana de San Pietro in Montorio
1994
NICCOLO CIRCIGNANI, ENTRE 1587 Y 1595, PINTO LOS LUNETOS DEL CLAUSTRO INTERIOR DE SAN PIETRO IN MONTORIO DE ROMA. EL PROGRAMA ICONOGRAFICO PRESENTA A SAN FRANCISCO DE ASIS COMO "ALTER CHRISTUS", IDEA RECOGIDA EN EL ESPIRITU DE "LAS FLORECILLAS", ADOPTADA POR SAN BUENAVENTURA AL INICIO DE SU "LEYENDA MAYOR" Y DESARROLLADA POR FRAY BARTOLOME DE PISA EN "LAS CONFORMIDADES". ESTAS FUENTES LITERARIAS, JUNTO CON LA VIDA DEL CELAMO, Y OTRAS PROCEDENTES DEL MUNDO DEL GRABADO SIRVIERON DE BASE AL CITADO PROGRAMA (ABC/LAG).
Stimulated Raman-Spectroscopy as the Essential Tool for Studying Collisional Effects - Application to Combustion
1994
3rd International Conference: Laser M2P DEC 08-10, 1993 LYON, FRANCE FEDERAT LASER CTR, RHONE ALPES REG; The main purposes of this paper are to give an overview of coherent Raman techniques with a particular emphasis on Stimulated Raman Spectroscopy (SRS) because this process can be considered as an essential tool for investigating collisional processes.
¿Crítica militante? problemas de la poesía al filo del milenio
1994
Las retóricas de Pedro Juan Núñez : (ediciones y manuscritos)
1994
Fractal investigation of the buit-up area in metropolitan areas, of transportation networks and of the urban growth
1994
International audience
Collagens in the injured porcine intervertebral disc
1994
Spinal pain often is thought to be due to degeneration and mechanical failure of the intervertebral disc. Since the mechanical strength of the tissue depends on collagen fibers, the present study was designed to investigate the reactions in collagen metabolism after an experimentally induced disc injury. Five domestic pigs underwent an incision in the anterior part of the annulus fibrosus of disc L4-L5 through a retroperitoneal approach. The animals were killed 3 months postoperatively, and the injured discs and intact discs (controls) from different animals were removed for chemical analysis. Slices were cut from seven different parts across the disc. The concentration of total collagen (h…
Comparative study of techniques for large-scale feature selection* *This work was suported by a SERC grant GR/E 97549. The first author was also supp…
1994
The combinatorial search problem arising in feature selection in high dimensional spaces is considered. Recently developed techniques based on the classical sequential methods and the (l, r) search called Floating search algorithms are compared against the Genetic approach to feature subset search. Both approaches have been designed with the view to give a good compromise between efficiency and effectiveness for large problems. The purpose of this paper is to investigate the applicability of these techniques to high dimensional problems of feature selection. The aim is to establish whether the properties inferred for these techniques from medium scale experiments involving up to a few tens …
The Role of Macrocyclic Receptors in Organization of Metal Centers
1994
The coordination properties of saturated aza or oxa-aza macrocyclic receptors are strictly dependent on their molecular topology. In order to rationalize the relationship between structural features and binding characteristics of such molecules we have studied the coordination behavior of different macrocyclic or macropolycyclic oxa-aza ligands towards metal cations. Depending on molecular topology, a variety of inorganic chemical species can be lodged inside the receptor’s cavity, such as simple metal ions, complexed inorganic anions, partially hydrated metal cations or binuclear assemblies.
Effect of ethylenediamine on the anodic stripping voltammetric determination of heavy metals in the presence of humic acid
1994
Ligand competition coupled with differential pulse anodic stripping voltammetry has been investigated for the determination of copper, lead and cadmium. Ethylenediamine displaces humic acid in its metal complexes forming kinetically labile compounds. It also eliminates interferences associated with the oxidation of copper. This enhances the sensitivity of the determination of the metals over a wide range of humic acid concentration (up to 30 mg/l). The procedure has been applied to the determination of heavy metals in a real water sample.
Psihohigiēnas nozīme cilvēka personības attīstībā
1994
La poesía española en 1992
1994
Pamón López Velarde: Poesía
1994
Aspects fractals de la morphologie urbaine
1994
National audience
Cathepsin D activity levels in colorectal cancer: Correlation with cathepsin B and L and other biological and clinical parameters
1994
Cathepsin D, B and L activity levels were determined in colorectal cancer and correlated with a number of biological and clinical parameters. Our studies have evidenced significant higher activity levels of these lysosomal enzymes in tumor cytosol compared to paired normal mucosa as well as an evident increase of tumor specific cathepsin D activity in Dukes' stage A tumors compared to later stages (B, C and D). Furthermore, significant higher cathepsin B and L activity levels were observed in Dukes' stage A compared to Dukes' stage D tumors while significant higher cathepsin B activity levels were observed in tumors ≤5 cm than in those >5 cm as well as in moderately differentiated tumors…
[35] Determination of oxidized glutathione in blood: High-performance liquid chromatography
1994
Publisher Summary The measurement of glutathione status is important in determining oxidative stress in tissues and biological fluids. The ratio of reduced to oxidized glutathione (GSH/GSSG) is a good indicator of the oxidative stress that may occur under physiological and pathological conditions. Changes in GSSG levels have been considered as intracellular signals able to modulate enzyme activity. Thus, it is important to have accurate methods to determine GSSG in biological fluids and in cells. In many cases, it is possible to use tissues, such as liver, muscle, or brain to determine GSH/GSSG. However, especially in human studies, samples from these tissues are not readily available; the …
Do Changes in Tumor Blood Flow Necessarily Lead to Changes in Tissue Oxygenation and in Bioenergetic Status?
1994
An increasing number of investigations carried out in recent years provide evidence suggesting that “chronic” decreases in tumor blood flow and/or tissue oxygenation (e.g., during tumor growth) or acute declines in the tissue perfusion (e.g., following therapeutic measures) might be accompanied by significant reductions in the energy status. In several instances, positive correlations between energy status and tumor blood flow or oxygenation have been reported (Lilly et al., 1985; Evelhoch et al., 1986; Tozer et al., 1989; Vaupel et al., 1989a, 1989b; Steen and Graham, 1991), and these investigations have led to the conclusion that blood flow may be the limiting factor in determining the bi…
El concepto de historicidad en Heidegger
1994
Ser y Tiempo debe su carácter emblemático de obra capital del pensamiento contemporáneo precisamente al nudo que forman en ella corrientes de pensamiento que siguen determinando el presente. Y de esto va a tratarse en esté trabajo. Lo que en él pretendo es mostrar por qué, cómo y con qué conceptuación Heidegger se vio llevado a minar el suelo sobre el que reposan los dos grandes intentos de reformulación del contenido normativo de la Ilustración que se han registrado en nuestro siglo, o mejor, mostrar por qué Heidegger puede pretender que ese suelo es un suelo minado. Y esto no puede hacerse, en efecto, sin mostrar el nudo de corrientes de pensamiento que representa Ser y Tiempo. Por lo dem…
Applications and Limitations of Robust Bayesian Bounds and Type II MLE
1994
Three applications of robust Bayesian analysis and three examples of its limitations are given. The applications that are reviewed are the development of an automatic Ockham’s Razor, outlier detection, and analysis of weighted distributions. Limitations of robust Bayesian bounds are highlighted through examples that include analysis of a paranormal experiment and a hierarchical model. This last example shows a disturbing difference between actual hierarchical Bayesian analysis and robust Bayesian bounds, a difference which also arises if, instead, a Type II MLE or empirical Bayes analysis is performed.
Oncogene-Associated Growth Behavior and Oxygenation of Multicellular Spheroids from Rat Embryo Fibroblasts
1994
It is now well documented that naturally occurring and experimentally induced tumors develop by a multistep process involving different stages such as unlimited growth, metastasis, and invasiveness. There is much evidence that malignant transformation involves activation of oncogenes and/or loss of suppressor genes (= anti-oncogenes). The former fundamental class of genes, including the ras and myc families, are associated with cell proliferation and differentiation and may mediate tumor initiation, promotion and progression (for reviews see: Spandidos, 1985; Spandidos and Anderson, 1987, Weinberg, 1989).
Mechanical and electrophysiological effects of cromakalim on the human urinary bladder.
1994
The effects of cromakalim on spontaneous and induced mechanical activity of human detrusor muscle were investigated in vitro. Cromakalim produces a concentration-related decrease of spontaneous as well as carbachol- and K(+)-evoked contractions. This is the first study to utilize the patch clamp technique to elucidate the mechanism of action of cromakalim on human detrusor cells. Cromakalim hyperpolarizes the detrusor cells by increasing the net outward current which is most likely carried by potassium ions. In the human urinary bladder, this effect is mediated by a glibenclamide-sensitive potassium channel, as glibenclamide is able to diminish the relaxant effect of cromakalim and to preve…
Context-dependent effects of tail-ornament damage on mating success in black grouse
1994
Sastatāmā un lietišķā valodniecība: Kontrastīvie pētījumi.3
1994
Krājuma rakstu autori analizē dažādu valodas līmeņu parādības angļu, senangļu, latviešu valodā, aizguvumos no dažādām kontaktvalodām, tulkojumos. Valodu sastatījums veikts kā strukturālā, tā arī funkcionālā un kultūrvēsturiskā aspektā. Atklātas šo valodu īpatnības, arī to kopīgās īpašības. Aplūkota arī valodu vienību mijiedarbība gan valodu kontaktu, gan tulkošanas procesā.
Aproximación comparativa al fenómeno tecnopole : una visión actual
1994
Apuntes para un estudio del contexto socio-político de la génesis del Príncipe
1994
A raiz de la exposición de la visión del panorama socio-cultural histórico de la época de Nicolás Maquiavelo, se demuestra que toda la filosofía política de Maquiavelo nace del ambiente de su época y del poso de amargura que sus experiencias políticas dejaran en su alma.
Humanistas y poetas en la corte napolitana de Alfonso el Magnánimo
1994
L’enseignement du droit dans les départements d’Outre-Mer
1994
International audience; Résumé à venir
On heterocyclic systems containing bismuth(III) 2. Eight-membered heterocycles Cl/Br/I-M(CH2CH2CH2)2X with lewis acidic group 15 atoms M As, Sb, Bi…
1994
Abstract Paths to the ligands (Cl/Br-CH2CH2CH2)2NR/O/S/Se, R Me, Bz, iPr, iBu, to the diGrignard reagents (Cl/BrMg-CH2CH2CH2)2NR/O/S, R Me, Bz, iPr, iBu and to the eight-membered group 15 heterocycles (Cl/Br/I-As/Sb/Bi(CH2CH2CH2)2NR/S, R Me, Bz, iBu are given. 13C-NMR, IR and Raman spectra are discussed; for the compound ClSb(CH2CH2CH2)2NMe the crystal structure analysis is given : the antimony atom is clearly Lewis acidic with ψ-trigonal-bipyramidal coordination and a transannular Sb⋯N interaction of 2.385(2) A. For such a configuration the values of the 13C-NMR chemical shifts of the α-CH2-groups (e.g. Cl-As/Sb/Bi(αCH2CH2CH2)2NMe 34.6, 25.9, 46.6 ppm) display clearly a sequence N > …