Fibrocartílago meniscal como biomaterial de sustitución en los Defectos Osteocondrales. Estudio experimental en el conejo con injertos homólogos

1990

Los autores presentan un estudio experimental en el cual han empleado homoinjertos de fibrocartílago meniscal, para reparar defectos osteocondrales localizados en zona de carga, del cóndilo medial de la rodilla del conejo. Han sido estudiados 33 animales, realizando un estudio histológico, con periodos de evolución comprendidos entre una semana y 22 meses. Los homoinjertos meniscales parecen ser capaces de restaurar una superficie articular funcional. Conservan su estructura y celularidad a lo largo de toda la experiencia consiguiendo un perfecto anclaje al lecho óseo, adaptándose a la carga y sin producir cambios en el cartílago articular vecino. No se han producido rechazos. The authors r…

Los Ultrasonidos en la Cadera Neonatal

1990

Los autores describen la técnica de Estudio mediante Ecografía de la cadera neonatal, las imágenes normales, los métodos de mediciones y las características de los distintos grados de displasia The authors describe the technique of the study by ultrasound examination of neonatal hip, normal images, methods of measurement and characteristics of differents degrees of dysplasia

Rearranged abietane diterpenoids from the root of teucrium polium subsp. vincentinum

1990

Abstract From the root of Teucrium polium subsp. vincentinum (Labiatae) four new rearranged abietane derivatives, teuvincenones A, B, C, and D (1-4, respectively), have been isolated. Two of these compounds, teuvincenones C (3) and D (4), possess a novel hydrocarbon skeleton which contains a cyclopropane ring constituted by the C-3, C-4, and C-18 carbons of the 17(15→16)-abeo-abietane framework. The structures of these diterpenoids were established mainly by spectroscopic means and, in the case of teuvincenones A (1) and C (3), also confirmed by X-ray diffraction analyses.

Phenotypic Flexibility in the Social Organization of Clethrionomys

1990

I review the flexibility of social organization and spacing behavior in Clethrionomys. This review is based on a 6-year comparative study and several experimental studies on cyclic populations of the bank vole, C. glareolus, in Central Finland. The social organization of Clethrionomys populations shows great flexibility during both the breeding and nonbreeding season, and is dependent on habitat patchiness, food availability, Predation, kinship, philopatry, and familiarity between individuals. The first three factors are most important in destabilizing a population, whereas the last three stabilize a population without exhausting its resources. Female territoriality can weaken in a producti…

Estudio comparativo de la dinámica eólica y la movilidad de las arenas entre las estaciones de Valencia-Viveros y la Devesa de l'Albufera

1990

Se estudia la dinámica eólica de los datos registrados en las estaciones meteorológicas de Valencia-Viveros y el Saler (Devesa de l'Albufera) durante el año 1987. Las frecuencias correlacionadas entre ambas estaciones han resultado ser un 37.5 %, siendo las intensidades de arrastre de las arenas para el período de máxima erosionabilidad diferentes según el método de cálculo empleado. Palabras Clave: Viento, dinámica eólica, intensidad de arrastre de arenas, Valencia, Devesa de l'Albufera.

L'impact des politiques sociales sur la réduction des inégalités

1990

International audience

The molecular architecture of the thylakoid membrane from various classes of eukaryotic algae

1990

There is convincing consensus that the photosynthetic apparatus is of prokaryotic origin. The wide variety of algal plastids is mostly assumed to be the result of different endocytological events. Chloroplasts surrounded by two membranes as in rhodophytes and chlorophytes were considered as the association of a prokaryotic symbiont and a eukaryotic host, whereas algae having a chloroplast surrounded with more than two membranes can be delineated from an endocytological event of two eukaryotes (see S. Gibbs in this volume). Since chlorophyll b was neither combined with chlorophyll c nor with phycobiliproteins it was proposed that all present day chloroplasts can be integrated in three lines.…

Electrochemical Syntheses Involving Carbon Dioxide

1990

The recent developments of electrosynthetic processes involving carbon dioxide are reviewed. Both processes involving carbon dioxide alone and electrocarboxylations are taken under consideration. The first of these two fields, mainly projected towards the production of basic chemicals such as methanol or carbon monoxide, is at present at a stage of fundamental research. Some interesting developments have recently appeared in the literature, concerning the use of electrode materials, or of transition metal complexes with particular catalytic activity. Electrocarboxylations are at a stage of more applicative development: some processes have reached the stage of pilot plant, and other have int…

Spinal cord monitoring during intraspinal extramedullary tumor operations (Peroneal nerve evoked responses)

1990

Longterm scalp recording of early SEP components triggered by peroneal or tibial nerve stimulation detects functional disturbances of spinal cord transmission due to mechanical trauma. We confirm previous observations that preoperative SEP patterns reflect neurological deficits and clearly show functional disturbances even on the side where they are not manifest. Peroneal nerve SEP have a well-known P40-peak corresponding to activities of neurons at the postcentral cortical layers. The P40-peak was identified in only 55% of our recordings. We therefore, tried to use the P50-peak that could be identified in 100% of the recordings under the difficult recording circumstances in the operating r…

Le système palatial franc: genèse et fonctionnement dans le nord-ouest du regnum

1990

Barbier Josiane. Le système palatial franc : genèse et fonctionnement dans le nord-ouest du regnum.. In: Bibliothèque de l'école des chartes. 1990, tome 148, livraison 2. pp. 245-299.

Las vicisitudes de la historiografía en las nacionalidades de la URSS

1990

EL ARTICULO TRATA DE LOS DIFERENTES ENFOQUES DADOS POR LA HISTORIOGRAFIA SOVIETICA AL PROBLEMA DE LAS NACIONALIDADES TOMANDO COMO EJEMPLO EL CASO DE LOS KAZAJOS INTEGRANTES DE LA R.S.S. DEL KAZAJSTAN, A TRAVES DEL ANALISIS DE LOS TEXTOS DE TRES VESIONES DE LA "HISTORIA DE LA R.S.S. KAZAKA" CITADOS EN LA CAPITAL ALMA-ATA EN 1943: EXALTACION DEL NACIONALISMO FRENTE AL IMPERIALISMO RUSO: 1943, EXALTACION DEL PROGRESISMO DEL PUEBLO KAZAJO CONTRA EL COLONIALISMO FEUDAL; Y 1957: ATAQUE CONTRA EL NACIONALISMO KAZAJO TENDENTE A ALIENAR KAZASTAN DE RUSIA Y DEL PUEBLO RUSO.

Neuropatías del Nervio Cubital a Nivel del codo: factores pronósticos

1990

En el presente trabajo se estudian los factores pronósticos invocados como influyentes en el resultado quirúrgico de las neuropatías del nervio cubital a nivel del codo. Desde 1970 los autores han intervenido 37 lesiones cubitales, que han clasificado según APFELBERG y LARSON. El grupo más frecuente de esta serie ha sido la Parálisis Cubital Tardía (14 casos), siguiéndole en importancia numérica el Síndrome Idiopático del Túnel Cubital (9 casos). La liberación con epineurotomía y transposición subcutánea, ha sido la técnica quirúrgica más veces utilizada (17 veces). En la valoración objetiva de resultados, han utilizado la usada por ADELAAR y colaboradores. Tras el análisis y discusión de l…

Production of pionic atoms with the ( pi -, pi +) reaction

1990

We have evaluated the cross section for the π-+A→π++(Aπ-) reaction in heavy nuclei producing deeply bound π- atom states still unobserved. The cross sections found, although in the measurable range, are only a small fraction of the background from the inclusive (π-,π+) reaction, which makes this experiment not very suited for the investigation of these elusive pionic states.

Origin and Evolution of High-Grade Gneiss Terrains

1990

In the previous chapters we have given an impression of the way in which the analysis of high-grade rocks can be approached in the field. Here we conclude with some current larger-scale ideas on the origin and evolution of such rock assemblages.

Behandlungsstrategie und Ergebnisse bei infizierten Knieendoprothesen

1990

Infekte stellen immer noch die am meisten gefurchtete Komplikation bei der Endoprothetik dar. Wegen ihrer fast subkutanen Lage sind Knieendoprothesen hier besonders anfallig [1, 3, 5, 7].

Comparative effects of equivalent intakes of 18:3 (n-3) and of marine (n-3) fatty acids on rat cardiac phospholipid contents and fatty acid compositi…

1990

Abstract Three groups of male Sprague-Dawley rats were fed for 4 weeks purified diets containing 15% by weight of oil mixtures varying in the nature and content of (n-3) polyunsaturated fatty acids (PUFA) but supplying similar levels of 18:2 (n-6) (10% of the total dietary fatty acids) and of saturated fatty acids (19% of the total fatty acids). The First diet (“Low 18:3”) contained small amounts of 18:3 (0.5% of the total fatty acids), the second (“18:3”) contained linolenic acid (10% of the total fatty acids) as the only source of (n-3) PUFA and the third one (“LC (n-3)”) contained the same amount of long chain (n-3) PUFA (mainly 20:5 and 22:6). Heart phospholipid classes were separated b…

Il ciclo roblesiano dei Vinti invitti

1990

Archives judiciaires et histoire contemporaine

1990

Diagnostik von Pleuraergüssen bei intensivpflichtigen Patienten: Sonographie und Radiologie im Vergleich

1990

Die Sonographie hat als unbelastende und leicht durchzufuhrende Untersuchungsmethode ihren festen Platz auch auf der Intensivstation. Hier konnen u. a. Pleuraergusse beim liegenden Patienten mit hoher Sensitivitat nachgewiesen werden [1–5] und zusatzlich, wie wir zeigen konnten, sicher volumetriert werden [2].

Eine neue Methode zur Messung der Skelettmuskeldurchblutung bei der arteriellen Verschlußkrankheit

1990

Mit dem neu fur die Myokard-Szintigraphie eingefuhrten Radio-pharmakon „Cardiolite“ sind jetzt auch nichtinvasive Messungen der Durchblutung der Skelettmuskulatur mit geringer Strahlenbelastung moglich. In einer vom BGA zugelassenen Pilot-Studie uber-pruften wir die klinische Brauchbarkeit dieser theoretisch bestechenden Methode.

Zvaigžņotā Debess: 1990, Pavasaris (127) - 1990/91 Ziema (130)

1990

De piscibus et aquatilibus libelli III novi (Zürich 1556) Ein bisher unbeachtetes zoologisches Werk von Conrad Gesner

1990

Conrad Gesner was one of the main representatives of Renaissance-Humanism. Although having great respect for the knowledge handed down by classical antiquity, he combined his studies of the ancient authors with empirical knowledge obtained by immediate observation of nature. His most famous work was the great „Historia animalium”, a comprehense encyclopedia of zoology. Preparing this main zoological work Gesner wrote a small book about fishes „De piscibus et aquatilibus libri III novi” (1556), through which it is possible to gain a deep insight into Gesner's preparatory work and method.

A Variational Formulation of the BEM for Elastic-Plastic Analysis

1990

The quasi-static elastic perfectly plastic analysis problem is approached by the boundary element method (BEM). To this purpose, a time semidiscretization is first achieved by finite intervals (Fl) in order to transform, through a variationally consistent procedure, the evolutive problem into a discrete sequence of inelastic holonomic-type “weighted” problems for each of which a mixed boundary/domain min-max principle is established. This principle is then discretized by means of boundary elements (BE) and cell elements (CE), the latter having the only purpose of suitably interpolating the FI weighted yielding laws within the domain. The algebraic governing equations obtained show symmetry …

Il monocameralismo

1990

the work deals with the study of the parliamentary systems that have adopted the single-chamber model, observing the reasons and the nature of the choice, also from a historical point of view, and the comparison with the two-chamber choice.

Le sanctuaire des Bolards

1990

National audience

The Interaction of State Transitions and Chlororespiration in the Xanthophycean Alga Pleurochloris Meiringensis

1990

Wavelength dependent State I-State II-transitions have been shown to exist in chlorophytes and red algae. Little is known about the regulation of energy distribution between the photosystems of chlorophyll c-containing plants. Previously it was shown that in the xanthophycean alga Pleurochloris meiringensis two states of energy distribution could be established [l]: In state “D” light is preferentially transferred to PS II, whereas in state “L” PS I is favoured. These state regulations strictly depend on the intensity and not on the wavelength of prei1lumination. In this paper we give new evidence that chlororespiration is involved in the mechanism of state “L”-state “D”-transitions.

Una reflexión en torno a la historia de la criminalidad

1990

Search For Light Neutral Higgs Particles Produced In Z0-decays

1990

A search for the neutral Higgs boson in Z0-decays has been performed using the DELPHI detector at the Large Electron Positron collider (LEP) at CERN. We looked for the decay of Z0 into a neutral Higgs particle and a pair of fermions. No events fulfilled the criteria for H0-production. Our results, which are based on an integrated luminosity of 530 nb-1, exclude a minimal Standard Model Higgs boson with a mass in the range 210 MeV/c2 to 14 GeV/c2 at 95% confidence level.

Capillary experiments of flow induced crystallization of HDPE

1990

Flow-induced crystallization experiments are made in a capillary apparatus modified with a downstream reservoir under pressure. Capillary length, diameter, and entrance angle are changed, as well as flow rate. The results show that the crystallization temperature is influenced both by the elongational flow at the capillary entrance and by the shear flow along the capillary. The independent effect of the pressure equals that obtained under static conditions. The effect of shear is correlated in terms of shearing work.

The System of Cattle Redistribution among the Boraana Obbuu and its Implications for Development Planning

1990

Una proposta de indagacio historica a partir de fonts etnologiques i orals

1990

Energy reserves of the capercaillie Tetrao urogallus in finlan

1990

Abstract 1. 1. The size of energy reserves, distribution of fat stores and the fatty acid composition of subcutaneous and pericardial adipose tissue of capercaillie (Tetrao urogallus) were studied in 12 adult birds shot in Sept.–Oct. and in 8 birds shot in March. Furthermore 4 captive birds were killed in Sept. 2. 2. A capercaillie male can maintain or even increase its body weight during winter, but as shown in the present work it is not a result of increased fat content. 3. 3. In general, capercaillie seems to contain more stored energy in the form of fat than other tetraonids so far studied, except Svalbard ptarmigan. 4. 4. In males total fat content in percentage of body weight varied o…

Coding Sequences with Constraints

1990

In this paper we consider the following problem: given all bi-infinite sequences of symbols satisfying certain constraints, search for a set X of words such that i): any concatenation of elements of X satisfies these constraints and ii): any sequence verifying the constraints can be “parsed” in elements of X.

[Physiopathological significance of renal blood flow reduction in patients with essential arterial hypertension].

1990

a group of 120 patients suffering from E.A.H. divided into three age Plasma renal flow was reduced on average in all three groups. It is t this fact could support the hypothesis that the change in renal per y a pathogenic role in E.A.H. ss F1/hlp F2/que F3/ext F4/can F5/nxt F6/ins F7/up F8/dwn F9/fin

Stereoisomeric flavor compounds, part XL : stereodifferentiation of some chiral volatiles on a permethylated beta-cyclodextrin phase

1990

International audience

On the Methods for Optimal Shape Design

1990

A short survey of the numerical methods for solving optimal shape design problems is given.