showing 36 of ~574560 from 574555 documents
المعونة الخارجية من أجل التربية في بلدان إفريقيا الواقعة وراء الصحراء، أهي مفيدة؟
1988
International audience
Multiplicity of Opioidergic Pathways Related to Cardiovascular Innervation: Differential Contribution of All Three Opioid Precursors
1988
The endogenous opioid family consists of the three precursors proenkephalin (proenkephalin A), prodynorphin (proenkephalin B), and proopiomelanocortin (POMC), from which various opioid and nonopioid peptides can be processed, apparently in a tissue-specific manner (cf. Civelli et al. 1984; Goldstein 1984; Herz 1984; Udenfriend and Kilpatrick 1984; Civelli et al. 1985; Khachaturian et al. 1985; Kosterlitz 1985). Their distribution in areas of the CNS which are involved in cardiovascular regulation is well documented. The biochemistry and functions of endocrine (pituitary and adrenal) opioids have also been well characterized (cf. Millan and Herz 1985). The conception that endocrine and CNS o…
El fracaso en la resolución de problemas de Física : una investigación orientada por nuevos supuestos
1988
Resumen basado en el de la publicación Resumen en inglés Se muestra un intento de cuestionar la forma habitual de enseñar la resolución de problemas y elaborar estrategias más efectivas teóricamente basadas en las propuestas. Se incluyen algunos resultados de las aplicaciones de nuevas orientaciones. ESP
\textquestiondown Es útil a la educación la ayuda exterior en el Africa subsahariana ?
1988
International audience
Ultrastructural pathology of dermal axons and Schwann cells in lysosomal diseases
1988
Skin tissue specimens, obtained from 60 patients afflicted with a diverse range of lysosomal disorders revealed two groups of lesions within dermal axons, largely unmyelinated ones, particularly within axonal terminals: (1) non-specific mitochondria and dense bodies often enlarging the axonal terminal; and (2) disease-specific lysosomal residual bodies, the latter less frequent depending on the incidence and type of lysosomal disorders, i.e., largely only seen in GM2-gangliosidosis due to hexosaminidase A deficiency and mucolipidosis IV, while the spectrum of lysosomal residual bodies in Schwann cells appeared more variegated, especially due to the occurrence of vacuolar lysosomal residual …
Wavelengths Measurements of Continuous Wave Lasers with a Wavemeter - Applications to High-Resolution Raman-Spectra Calibration
1988
0150-536X
Neue Techniken in der endoskopischen Mikrochirurgie
1988
In dem Videofilm werden die tierexperimentellen Ergebnisse zweier neuer endosko-pisch-mikrochirurgischer Techniken gezeigt: Die Transanale Endoskopische Rektopexie beim Rektumprolaps: Quere Incision in der Rektumhinterwand; Abpraparieren des Rektums vom Kreuzbein; transmurale Einzelnahte vom Darmlumen aus durch die pasacralen Ligamente zum Darmlumen zuruck; Verschlus der Incision mit querer Naht. Die Endoskopische Dissektion der Speiserohre: Spezielles Operationsendoskop; freipraparieren des Oesophagus vom cervicalen Zugang; Hochziehen eines Katheters neben der Speiserohre; Einnahen in den aboralen Stumpf der durchtrennten Speiserohre; Herausziehen nach abdominal.
Description deSkrjabinelazia pyrenaican. sp. (Nematoda : Seuratidae) et proposition d’une nouvelle diagnose pour le genreSkrjabinelazia
1988
Description de Skrjabinelazia pyrenaica n. sp. (Nematoda : Seuratidae), parasite intestinal du lezard iberique Podarcis hispanica (Steindachner, 1870) et du lezard des murailles Podarcis muralis (Laurenti, 1768) (Reptilia : Lacertidae), captures dans les Pyrenees Centrales iberiques. La nouvelle espece est caracterisee, chez le mâle, par le nombre de papilles cloacales et la longueur des spicules et du gubernaculum et chez la femelle par la presence d’une ornementation cuticulaire particuliere, ainsi que par les dimensions des œufs. En accord avec les caracteristiques morphologiques et anatomiques observees chez S. pyrenaica n. sp. et apres la revision generique de Skrjabinelazia , une nouv…
Chapter 21 Immunohistochemical evidence for a co-transmitter role of opioid peptides in primary sensory neurons
1988
Publisher Summary The purpose of this chapter is to answer several open questions regarding opioid peptides by using a highly sensitive light microscopic (LM) immunohistochemical approach. The chapter mentions the immunohistochemical evidence for a co-transmitter role of opioid peptides in primary sensory neurons. It introduces the concept that there is a functionally important tandem constellation of transmitters in a specific nociceptive population of primary sensory afferents consisting of (1) an inhibitory transmitter family, the opioid peptides, and (2) an excitatory transmitter family, the tachykinins. Small-diameter primary sensory neurons not only transmit nociceptive messages to ce…
Dificultades en la enseñanza/aprendizaje de la física cuántica
1988
Abstract We have elaborated a questionnaire about some selected basic concepts on Modern Physics, We have then analysed the students comprehension level on Quantum Physics before they follow this matter in the 3er year of Physics studies. Once this course has been completed. the evolution of the previous misconceptions is studied. We conclude that a teaching which considers previous misconceptions results in a sensitive improvement. However, we also detect the persistence of a few misconceptions acquired during the non-university teaching.
La espiritualidad valenciana : el Iluminismo en los siglos XVI y XVII
1988
Acid-Base Properties and their Influence on the Photoreactivity of Oxides
1988
It is described the existence on the surface of a solid of acidic and basic centres. The correlation with electron donor-acceptor properties is described. The influence of such centres in influencing the reactivity in a photocatalytic process is discussed. The case of ethanoic acid photodecarboxylation over a series of insulator and semiconductor oxides and their mixtures is briefly reported outlining how the acid-base properties affect the photoreactivity.
Soliton Statistical Mechanics: Statistical Mechanics of the Quantum and Classical Integrable Models
1988
It is shown how the Bethe Ansatz (BA) analysis for the quantum statistical mechanics of the Nonlinear Schrodinger Model generalises to the other quantum integrable models and to the classical statistical mechanics of the classical integrable models. The bose-fermi equivalence of these models plays a fundamental role even at classical level. Two methods for calculating the quantum or classical free energies are developed: one generalises the BA method the other uses functional integral methods. The familiar classical action-angle variables of the integrable models developed for the real line R are used throughout, but the crucial importance of periodic boundary conditions is recognized and t…
Nuclear Physics Constraints to Bring the Astrophysical R-Process to the “Waiting Point”
1988
Rapid neutron-capture (r-process) nucleosynthesis of heavy elements generally involves the participation of large numbers of stable to highly unstable nuclear species. Most of these properties are experimentally unknown and have to be predicted from nuclear models. So far, the uncertainties of such predictions have not allowed putting substantial constraints on astrophysical scenarios. For the classical r-process it is shown that the s-decay properties of only a few key-nuclei, i.e. the recently measured “waiting-point” nuclei 130Cd82 and 80Zn50 together with new shell-model predictions for their N ≈ 82 and 50 neighbours, may be sufficient to explain the observed r-abundances in the A ≈ 130…
Kalendarze górnośląskie jako źródło badań nad regionalną kulturą ludową
1988
Регуляция роста растений
1988
В сборнике обобщены результаты научно-исследовательской работы по изучению влияния химических и физических факторов на рост, развитие, сексуализацию и продуктивность растений. Изучалось влияние таких эндогенных регуляторов, как фитогормоны ( использованы в питательных средах для культур тканей растений) и фенольные соединения, из химических соединений хлорхолинхлорид , а из физических - предпосевная термическая обработка семян.
Financement des investissements et calculs de rentabilité
1988
L'objet de cet exposé est de fournir quelques éléments sur la prise en compte du financement des investissements lors des calculs de rentabilité. La première partie (section 1) sera consacrée à la comparaison des calculs de rentabilité globale et des calculs de rentabilité des capitaux propres dansle cas où l'on suppose qu'il n'y a pas de rationnement du capital
Lesiones ligamentosas de la articulación subastragalina
1988
Los autores han revisado 263 pacientes afectos de Síndrome del Seno del Tarso postraumático. Estos fueron tratados mediante infiltración en el «sinus tarsi» con anestesia local y corticoides depot más inmovilización con bota de yeso, respondiendo favorablemente un 84'03%; al resto se les practicó un legrado del seno del tarso, y sólo fue precisa la artrodesis subastragalina en seis casos. Consideramos que los casos en que hay lesión del componente interno profundo del ligamento astragalo calcáneo, son los que pueden llegar a precisar artrodesis de la subastragalina.
Treatment of Ulcerative Colitis with Olsalazine and Sulphasalazine: Efficacy and Side-Effects
1988
The effects of olsalazine were studied mainly in patients with ulcerative colitis who were intolerant to sulphasalazine, and for relapse prevention. A crossover design with sulphasalazine, 3 g/day, and olsalazine, 1.5 g/day, was applied to compare the side-effects of each drug and to evaluate their therapeutic efficacy. A total of 41 patients with mild or moderately severe left-sided colitis or proctitis were assigned to a randomized treatment schedule. Olsalazine and sulphasalazine were similar in their therapeutic efficacy. Twelve patients complained of adverse effects while on sulphasalazine and 4 patients during olsalazine treatment (p less than 0.05). It is concluded that olsalazine is…
Conmutatividad entre límites inductivos y productos tensoriales
1988
Tratamiento profiláctico por anaerobios con oxígeno hiperbárico
1988
The authors report their experience in the use of hyperbaric camera in the management of anaerobic infections after important traumatisms throughout the period of time 1984-1985. A double blind study is carried out. The first group includes those patients under treatment with hyperbaric oxygen, once the anaerobic infection has been detected. The second group is formed by patients who received, during the 24 hours after the accident, profilactic treatment in the hyperbaric camera. The results obtained in the first group were 84'3% good, whilst in the second group there were no cases of anaerobic infection. Therefore, these results Jed authors believe that the use of hyperbaric oxygen must be…
Antonio López Gómez y su generación de geógrafos
1988
Hacia un realismo epistémico en filosofia de la percepción
1988
En el presente articulo me proponga defender una concepción de la percepción que lIamaré 'realismo epislémico' y que, considero, representa -tal vez mejora* do-el concepta de percepción que preanaliticamente mantiene el sentida común. El realismo cpistémico puede ser caracterizado en resumen por las dos afirmacio-oes fundamentales siguientes: 1) Muchas veces podemos percibir directamente un objeto material, y sicmprc, quid con la excepción de las post-imagenes, un objeto pública, I esta es, muchas veces podemos saber de manera ¡nmediata que aquella que percibimos es un objeto física y muchas veces también qué cosa es esc objeto pública. 2) En la percepción aquella que es relevante es su can…
Preparative separation of phospholipids by flash-HPLC
1988
Solution behaviour and relative stability of the complexes [MCl2(RNCHCHNR)] and [MCl2(py-2-CHNR)] (M=Pd, Pt;R=C6H4OMe-p)
1988
Abstract Even though the α-diimino complexes [MCl 2 (RNCHCHNR)] and [MCl 2 (py-2-CHNR)] (M=Pd, Pt;R=C 6 H 4 OMe- p ) are poorly soluble in chlorinated solvents, such as chloroform and 1,2-dichloroethane, or in acetonitrile, the electronic and 1 H NMR spectra indicate that these compounds are generally present as undissociate monomers with σ, σ′- N,N′ chelate N-ligands in dilute solutions. Only for [PdCl 2 (RNCHCHNR)], some dissociation of the α-diimine occurs in acetonitrile. In dimethylsulfoxide, where the solubility is much higher, no dissociation is observed for the pyridine-2-carbaldimine complexes [MCl 2 (py-2-CHNR)], whereas the 1,2-bis(imino) ethane derivatives [MCl 2 (RNCH…
Study of the biosynthesis of 3-Isopropyl-2-metoxypyrazine produced by Pseudomonas taetrolens
1988
International audience
La cuestión del extremal en el regadío de la Real Acequia de Montcada
1988
Dentro del perímetro dominado por el Canal de la real Acequia de Montcada, en los espacios de regadío tradicional situados al norte de la ciudad de Valencia, ha persistido, hasta los años centrales de nuestro siglo, un subespacio regado con características propias y diferenciadas. Este subespacio, denominado Extremal, utilizó tradicionalmente como recurso hídrico las aguas provenientes del manto freático, afloradas de forma natural en los denominados ullals, o mediante excavaciones horizontales denominadas fonts. El Extremal se yuxtaponía, dentro del perímetro regado por la Real Acequia de Montcada, al Jovedat o espacio regado con aguas alóctonas derivadas del río Turia. Ambos espacios, act…
Enucleación aislada del astrágalo
1988
Isolated enucleation of the talus is reported. It is an uncommon injury. The management and complications are analised; emphasizing the indication of an early reduction.
Separation and Biochemical Characterization of Rat Liver Parenchymal Cell Subpopulations
1988
Parenchymal cells within the hepatic lobules of the rat are morphologically and biochemically heterogeneous (Shank et al., 1959; Novikoff, 1959; Loud, 1968; Jungermann and Katz, 1982). It has been previously shown that the concentration of cytochrome P-450 and the activities of most cytochrome P-450-dependent monooxygenases are relatively higher in the centrilobular regions than in the periportal regions of the rat liver (Baron et al., 1978; Gooding et al., 1978; Baron and Kawabata, 1983); further, these studies revealed that pretreatment of the animals with phenobarbital intensified this gradation across the liver lobule, whereas after administration of 3-methylcholanthrene the concentrati…
Varietal and geographic classification of french red wines in terms of pigments and flavonoid compounds
1988
Thirty-four French red wines originating from six different grape varieties and three different production areas were analysed in duplicate for 15 anthocyanins, ten flavonoids and three colour parameters, F-statistics, principal component analysis and stepwise discriminant analysis were used to identify and to explain differences among samples. Clear difference between wines made from different varieties were mainly related to anthocyanin 3-acylglucosides. Malvidin and peonidin 3-acetylglucosides were found in increasing concentrations in wines made respectively from Grenache, Carignan, Cinsault, Merlot, Carbernet Sauvignon and Cabernet Franc grapes; the concentrations of peonidin and malvi…
Evaluation of B-cell secretion and peripheral insulin resistance during pregnancy and after delivery in gestational diabetes mellitus with obesity
1988
Nine pregnant women with gestational diabetes mellitus (GDM) were studied. Six normal pregnant women and six normal nonpregnant women were evaluated as control groups. All the women underwent oral glucose tolerance test and glucose clamp during the third trimester of pregnancy and two months after delivery. During OGTT, glucose, C-peptide and insulin plasma levels were determined. C-peptide and insulin values in the late phase of OGTT were higher during pregnancy than after delivery in both groups. In gestational diabetic women, the M-value in the second steady-state during glucose clamp was lower than in controls, both during pregnancy and after delivery. Nevertheless, in both groups the M…
Osteocondritis disecante de astrágalo : a propósito de un caso de localización bilateral
1988
A case of bilateral osteochondritis dissecans of the Talus is reported. A review of the aetiologic factors, clinical assessment and therapeutic trends is described.
L'Estany Gran de Cullera: evolución geomorfológica
1988
El presente trabajo se inserta dentro del estudio de zonas de marjal y albufera, que jalonan las costas de acumulación valencianas. L'Estany Gran, situado al sur de la desembocadura del Xúquer, a primera vista se podría identificar con una gola relicta de albufera, sin embargo, tras la comprobación de sus profundidades se hace difícil sostener la hipótesis por sí sola. Llevado a cabo el estudio de su génesis y evolución, así como de las transformaciones recientes del propio lago y de los ambientes circundantes, se emite una hipótesis que explicaría su morfología actual, en donde destacarían de forma relevante los aportes de agua subterránea que alimentan en lago.
‘Una nuova versione del Quid suum virtutis’
1988
Mogućnosti i granice montaže modela čeljusti orijentiranih prema šarnirskoj osi
1988
Terminalna šarnirska os može se odrediti na dva načina: egzaktna (točna metoda) i metoda prosječne šarnirske osi. Za točnu lokalizaciju šarnirske osi u ovom je istraživanju upotrijebljen Lauritzen - pribor i SAM obrazni luk s metalnim pločicama i milimetarskim papirom. Ispitivalo se s kojom je točnošću moguće odrediti šarnirsku os i s kojom inkongruencijom šarnirske osi i osi artikulatora treba računati pri primjeni metode prosječne šarnirske osi. Dobivene vrijednosti pri montaži donjih modela prema točno određenoj šarnirskoj osi varirale su ± 0,8 mm od srednje vrijednosti u sagitalnoj i vertikalnoj ravnini. Prosječno odstupanje dobivenih vrijednosti pri montaži modela prema prosječnoj šarn…
Puntualizaciones acerca de la aportación diagnóstica y terapéutica de las técnicas angiográficas en la patología tumoral ostearticular
1988
The author reports three cases of aneurysmal bone cysts with angiographic diagnosis with bibliographic review. This method is used for diagnostic usage or preoperatory embolisation method.