showing 36 of ~574560 from 574555 documents
Analysis of evaporative flux data for various climates
1992
International audience
Le site protohistorique d'Acy-Romance (Ardennes). 1 : l'habitat gaulois (1988-1990)
1992
La estereoquímica como asignatura complementaria de interrelación
1992
Brachiopodes et Mollusques Bivalves: Concurrence ou indifférence?
1992
Resume Dans le debat entre les tenants d'une concurrence directe entre les Brachiopodes et les Mollusques Bivalves, et ceux pour lesquels la substitution des Bivalves aux Brachiopodes dans les communautes benthiques a partir du Mesozoique n'est que la consequence de potentialites evolutives differentes, nous proposons une analyse critique et objective des donnees disponibles et de leur interpretation. L'etude quantitative des informations (celles du Treatise) associees a l'analyse des donnees ecologiques nous conduisent a opter en faveur d'une indifference globale des deux groupes dans leurs processus evolutifs respectifs; ces processus ont ete acceleres et/ou gravement perturbes lors des g…
Past and present role of the Indian-fig prickly-pear (Opuntia ficus-indica (L.) Miller, Cactaceae) in the agriculture of sicily
1992
Of prickly-pear cacti occurring in Sicily, the most widespread and economically important is Opuntia ficus-indica (L.) Miller. In Sicily it has, since its introduction, played an important role in the exploitation of marginal areas. The Sicilian experience is described with reference to the historical outlines and the present intensive production of late fruit. Information on historical and actual uses of the plant and its products (flowers, cladodes, fruits) is given.
Structures of the beticolins, the yellow toxins produced by Cercospora beticola
1992
International audience
Commenting on Written Arguments as a Part of Argumentation Skills — comparison between students engaged in traditional vs on‐line study
1992
ABSTRACT The use of computer‐mediated communication (CMC) has increased in the area of education. This article reports a study whose aim was to improve the argumentation and scientific thinking skills of university students through argumentative on‐line studying. The research problems dealt on the one hand with learning outcomes in terms of subject content and on the other hand with argumentation skills. The results were compared between on‐line students and students who studied in a traditional way. The results indicated that the traditional group got better learning outcomes than the on‐line students who, by contrast, succeeded better in the tasks of argumentation skills. The findings sug…
Insulin resistance and endogenous digoxin-like factor in obese hypertensive patients with glucose intolerance
1992
Hypertensive obese subjects with glucose intolerance have hyperinsulinaemia, insulin resistance and intracellular cation imbalance resulting in increased sodium content. The aim of our study was to assess in these patients plasma levels of endogenous digoxin-like factor (EDLF), an inhibitor of the sodium-pump mechanism. We studied 14 hypertensive and 12 normotensive subjects with obesity and glucose intolerance for fasting blood glucose, and plasma insulin, C-peptide and EDLF levels: the two groups were matched for age and BMI and were studied after a 2-week wash-out period from hypotensive drugs. Compared with normotensives, hypertensive subjects had higher plasma insulin levels, a greater…
L'école primaire en Afrique
1992
First Reactions of 2,2′-Bisindolyls with Electrophilic Azo Compounds and Diethyl Mesoxalate
1992
Conformations and some electronic properties of the 2,2′-bisindolyls 6 were calculated for the prediction of probable Diels-Alder reactivity, in analogy to previous work on 2-vinylindoles. First reactions with dienophiles revealed that compounds 6 did not participate in [4 + 2]cycloadditions but rather underwent simple electrophilic substitutions at the enamine function with, above all, some heterodienophiles. Erste Reaktionen von 2,2′-Bisindolylen mit elektrophilen Azoverbindungen und Diethylmesoxalat Zur Vorhersage moglicher Diels-Alder-Reaktionen an 2,2′-Bisindolylen 6 werden Berechnungen zur Konformation und uber elektronische Eigenschaften durchgefuhrt. Die erstmals durchgefuhrten Reak…
Karyotype analyses reveal inter-individual polymorphism and association of nucleolus-organizer-carrying chromosomes in Capros aper (Pisces: Zeiformes)
1992
Three different karyomorphs with 2n=46, 2n=44 and 2n=42 for Capros aper (L., 1758) (Zeiformes) collected from the Gulf of Lion, near Banyuls-sur-Mer, France, in July 1990 were determined. Karyomorphs were characterized by the same arm number [Fundamental number (FN)=50], suggesting that chromosome variations are due to Robertsonian fusions. In somatic metaphase spreads stained with silver nitrate, nucleolus organizer regions (NORs) consistently occupied a terminal position on the short arms of two small submetacentric chromosomes. Ca. 30% of silver-stained metaphases in each specimen showed NOR chromosomes associated in pairs by their nucleolus organizer regions.
A Survey of the Reliability Methods Approach in Some Codes for Structural Design
1992
Structural codes are documents which are subject to periodic revision and amendment. The main reason of this is due to developments from theoretical and experimental research. The rules and codes for the design of civil engineering structures which are prepared or which are under preparation by different regional and international organizations are under review. Similarities and differences in the approaches to the reliability — oriented concept of calculated safety verifications on the design stages prescribed in the codes (available to author) are presented in this paper.
Matemātika
1992
PICTORIAL-C LANGUAGE FOR THE HERMIA-MACHINE
1992
The design and implementation of algorithms on multi-processors machines is hard. The paper describes the general features of the Pictorial C Language (PICL) that is oriented to image analysis. Its integration in the software environment of the HERMIA machine, and the handling of the related interconnecting network topology is also given.
Contraintes budgétaires, développement des ressources humaines et croissance économique en Afrique sub-saharienne
1992
International audience
Osteogenesis imperfecta: a clinical study of the first ten years of life.
1992
One hundred twenty-seven children with osteogenesis imperfecta (O.I.) were studied during the first 10 years of life. According to Sillence, 40 patients were assigned to type I, 39 to type III, and 48 to type IV O.I. Centiles for height, weight, and the annual number of fractures could be established for the different types of O.I. The development of the skeletal changes could be documented for the different forms of the disease. At birth, the skeletal changes were significantly more severe in type III than in type IV patients. During the first 10 years of life the number of fractures, extent of skeletal deformities, and growth retardation did not differ between types III and IV. Only fract…
Improved measurements of electroweak parameters from Z decays into fermion pairs
1992
The properties of the Z resonance are measured on the basis of 190000 Z decays into fermion pairs collected with the ALEPH detector at LEP. Assuming lepton universality, M(Z) = (91.182 +/- 0.009exp +/- 0.020L;P) GeV, GAMMA(Z) = (2484 +/- 17) MeV, sigma(had)0 = (41.44 +/- 0.36) nb, and GAMMA(had)/GAMMA(ll) = 21.00 +/- 0.20. The corresponding number of light neutrino species is 2.97 +/- 0.07. The forward-backward asymmetry in leptonic decays is used to determine the ratio of vector to axial-vector coupling constants of leptons: g(V)2(M(Z)2)/g(A)2(M(Z)2) = 0.0072 +/- 0.0027. Combining these results with ALEPH results on quark charge and bbBAR asymmetries, and tau-polarization, sin2 theta(W)(M(…
Gly-Pro-4-DIMETHYLAMINOANILIDE - SYNTHESIS AND APPLICATION FOR DIPEPTIDYL AMINOPEPTIDASE IV ACTIVITY DETERMINATION
1992
W pracy przedstawiono syntezę substratu dla diaminopeptydazy IV (DAP IV; EC 3.4.14.5). Substratem tym jest Gly-Pro-4-dimetyloaminoanilid (Gly-Pro-DMAA). W wyniku prowadzonej hydrolizy enzymatycznej, diaminopeptydaza IV uwalnia z Gly-Pro-4- dimetyloaminoanilidu jako substratu 4-dimetyloaminoanilin~(DMAA). Ilość uwolnionej DMAA określa aktywność enzymu. W celu oznaczenia ilości DMAA przeprowadzono ją w barwną pochodną chinonoiminową, którą można oznaczyć metodą spektrofotometryczną. Jako subtrat do tej reakcji wybrano kwas 1-hydroksy-2-naftoesowy, natomiast utleniaczem był heksacyjanożelazian (lll) potasu. W wyniku reakcji otrzymano barwnik niebieski 0 maksimum absorpcji przy długości fali 60…
Sulla tutela dei centri storici sotto il profilo della tutela ambientale e monumentale
1992
Les relations entre juristes européens au XIXe siècle : la correspondance Laboulaye-Warnkoenig, 1839-1866
1992
International audience; Résumé à venir
Eine neue Art der Gattung Sideritis L. (Lamiaceae) aus Spanien
1992
Aus der spanischen Flora wird eine neue Art der Gattung Sideritis L. beschrieben. A description is given of a new species of the genus Sideritis L. for the Spanish Flora.
Dynamic 2- and 3-connectivity on planar graphs
1992
We study the problem of maintaining the 2-edge-, 2-vertex-, and 3-edge-connected components of a dynamic planar graph subject to edge deletions. The 2-edge-connected components can be maintained in a total of O(n log n) time under any sequence of at most O(n) deletions. This gives O(log n) amortized time per deletion. The 2-vertex- and 3-edge-connected components can be maintained in a total of O(n log2n) time. This gives O(log2n) amortized time per deletion. The space required by all our data structures is O(n).
Translocation of the nuclear autoantigen La to the cell surface of herpes simplex virus type 1 infected cells.
1992
Recently we developed a procedure to translocalize one of the extractable nuclear antigens (ENAs), the La protein, to the cell surface of CV-1 cells. Here we report that herpes simplex virus type 1 infection can also induce a translocation of the autoantigen to the cell surface. On the cell surface we detected La protein assembled with large protrusions. Within these protrusions La protein colocalized with virus particles. These protrusions are known to be released from the cell after virus infections. Such complexes consisting of self and virus could provide helper determinants for an anti-self response, and therefore be important in generation of autoimmunity.
Kultura popularna i pułapki śląskoznawstwa : O. Słomczyńska , Książki z kraju J. Lompy, K. Damrota, J. Ligonia, Opole 1990
1992
Sur la piste des Éduens
1992
Análisis metodológico de la interacción metal-molécula
1992
La enseñanza de los "saberes útiles" en el Río de la Plata (1790-1810)
1992
Jornadas sobre la Presencia Universitaria Española en América (5. 1991. Alcalá de Henares)
La prevención de la delicuencia en la España de la postguerra
1992
El presente artículo intenta ofrecer la visión que sobre la prevención de la conducta delictiva o antisocial mantenían los estudiosos de este campo entre las décadas de 1940 y 1960. Más que de conducta delictiva se habla de conducta antisocial, inadaptada o irregular. Se insta a que la sociedad plantee soluciones a corto y largo plazo que atajen la evolución de incipientes manifestaciones antinormativas hacia conductas más problemáticas en la vida adulta y de mayor repercusión social. Se trata por lo tanto de un período que, contextualizado en el marco socioeconómico de la posguerra, muestra gran interés por la necesidad de cuidar y proteger al niño difícil o problemático como medida preven…
Niveau de formation et performances à l'exportation des régions françaises
1992
International audience
No evidence for efficacy of intrathecal verapamil in the treatment of tonic-clonic status epilepticus
1992
In two patients with refractory generalized tonic-clonic status epilepticus, 15 mg of the calcium antagonist verapamil was given by suboccipital intrathecal administration. During a 2–6-h observation period, seizure frequency did not decrease. However, in one patient, verapamil induced severe hypotension. Subsequent thiopental anesthesia suppressed convulsions immediately. Our results indicate that, in contradistinction to animal studies with different administration techniques, intrathecal administration of verapamil does not produce any anticonvulsant effect in humans.
Evidence against linkage of schizophrenia to chromosome 5q11-q13 markers in systematically ascertained families.
1992
Ten pedigrees systematically ascertained in Germany were tested for linkage to chromosome 5q11-q13. In order to replicate the previous report by Sherrington et al (1988), families with a bipolar family member were omitted from the lod score calculations, all diagnoses were based upon Research Diagnostic Criteria, and four different models of the affection status were calculated, including the model for which Sherrington et al calculated the highest lod scores. None of the families investigated showed a positive lod score. Using multipoint linkage analyses, we were able to exclude the region for which a positive linkage has been reported.
El helor del cuerpo
1992
Ensayo sobre las formas clásicas y modernas de la metamorfosis. En esta figura mitológica se advierte de manera privilegiada la entrada del imaginario científico, biológico y genético en el dominio de las construcciones literarias y cinematográficas.
Synthesis and 1H-NMR configurational study of δ3-thiazolines from 2-aza-1,3-dienes
1992
Abstract A [4+1] heterocyclization process involving 2-aza-1,3-dienes and elemental sulphur leading to the synthesis of Δ3-thiazolines with excellent yields is described. A 1D TOCSY and 1D NOESY study of these systems was made in order to establish the configurations of the diastereoisomeric mixture.
Synergistic Platelet Inhibitory Effect of the Phosphodiesterase Inhibitor Piroximone and Iloprost
1992
Platelet activity is regulated through synthesis and degradation of the intracellular second messengers cAMP or cGMP. The antiplatelet effect of the phosphodiesterase (PDE) III inhibitor Piroximone (PIR) was studied in vitro in platelet rich plasma. ADP induced aggregation was inhibited by PIR with an IC50 of 67 +/- 43 microM. The inhibitory effect was time and dose dependent. The antiaggregatory effects in vivo were studied in anaesthetised rats. Reduction of platelet count following injection of 100 micrograms/kg bw collagen was measured after bolus injection of PIR and vehicle. Piroximone bolus 2 mg/kg bw resulted in a 50% inhibition of platelet aggregation in rats. Cyclic AMP levels in …
La France et son gouvernement au milieu du XVe siècle d'après Bernard de Rosier
1992
Arabeyre Patrick. La France et son gouvernement au milieu du XVe siècle d'après Bernard de Rosier.. In: Bibliothèque de l'école des chartes. 1992, tome 150, livraison 2. pp. 245-285.