Conclusion générale

1980

The use of the de deckere-ten hoor preparation for study of nicotinic and potassium-evoked dopamine ?-hydroxylase release from the rabbit heart

1980

1. Dopamine β-hydroxylase (DBH) and noradrenaline were determined both in the venous effluent (perfusate) and in the transmyocardial fluid (TMF) collected from the apex of the rabbit isolated heart which was prepared according to De Deckere and Ten Hoor (1977) and perfused with Tyrode's solution at 20 ml/min. 2. Perfusion for 2 min with the nicotinic drug, p-aminophenethyl-trimethylammonium (PAPETA), both in the absence of presence of atropine evoked noradrenaline overflow into the perfusate and TMF that was maximal in the 0–2 min sample and declined from maximum with a t1/2 of 0.6 min. DBH was released into TMF with the maximum from 2–4 min and a t1/2 of decline of 5.6 min. 3. High K-low N…

Filtrado a presión de pastas cerámicas

1980

Über polygermane

1980

Abstract The crystal structure of octaphenylcyclotetragermane, (Ph 2 Ge) 4 , has been determined and refined to an R value of 0.046. The symmetry of the molecule approximater D 2d . the Ge 4 ring is nearly planar and square (angle of pucker 3.9°, GeGe 246.5(5) pm). The 8 phenyl groups (GeC 196.2(10) pm) are arranged in two distinct sets (“parallel” touching and perpendicular to the Ge 4 ring) which exchange their positions in solution. The packing of the (Ph 2 Ge) 4 molecules in the crystal resembles a cubic body centred sphere packing. The homocyclic series (Ph 2 Ge) n with n  4, 5, 6 shows 13 C NMR signals in CDCl 3 solution monotonic dependent on the endocyclic GeGeGe angles.

THE EFFECTS OF MUSCARINIC AGONISTS AND ANTAGONISTS ON ACETYLCHOLINE RELEASE FROM PERIPHERAL CHOLINERGIC NERVES IN THE ABSENCE AND PRESENCE OF A CHOLI…

1980

Effects of physical training on metabolism of connective tissues in young mice.

1980

The effects of physical training on the metabolism of collagen, calcium and glycosaminoglycans in various connective tissues were studied in male NMRI mice. The mice to be trained and their controls were about 3 weeks old (expt. I) and 8 weeks old (expt. II) at the commencement of training. The training was performed on a 5 degree inclined treadmill 5 days a week for 4 weeks in expt. I and for 3 weeks in expt. II. The daily exercise time was progressively increased from 20 min in the first week up to 80 min in the third week. The incorporation of 3H-proline to collagen hydroxyproline was increased by training in long bones, skeletal muscle and Achilles tendon, whereas the incorporation of 3…

La asistencia sanitaria en Valencia : (1400-1512)

1980

Struktur-Wirkungs-Beziehungen bei Histaminanaloga, 22. Mitt. Absolute Konfiguration und histaminartige Wirkung der enantiomeren α, Nα-Dimethylhistami…

1980

Es werden die Synthesen der enantiomeren α, Nα-Dimethylhistamine (+)—3 und (−)—3, die Ableitung der absoluten Konfiguration sowie die histaminartige Wirksamkeit der Enantiomere am Ileum (H1) und Atrium (H2) des Meerschweinchens beschrieben. Structure-Activity Relationship of Histamine Analogues. XXII: Absolute Configuration and Histamine-like Activity of the Enantiomeric α, Nα-Dimethylhistamines The synthesis of the enantiomeric α, Nα-Dimethylhistamines (+)—3 and (−)—3, the determination of the absolute configuration and the histamine-like activity of the enantiomers on the guinea-pig ileum (H1) and atrium (H2) are reported.

Modèles de régression avec variables muettes explicatives

1980

Dans cette note nous considérons des modèles de régression dans lesquels on trouve, parmi les variables explicatives, des variables qualitatives.Le recours à des variables qualitatives explicatives est très fréquent dans les études économiques, comme en sociologie et dans d'autres disciplines,d'où l'importance d'une analyse systématique, sous l'angle méthodologique etopérationnel, du problème de l'estimation d'une régression en présence devariables qualitatives explicatives.Dans le premier paragraphe, nous étudions le modèle de régression classique avec une seule variable muette à plusieurs attributs. On y verra quel'estimation du modèle peut se faire à l'aide d'une transformation très simp…

De l'efficacité et de l'équité dans les choix en matière de carte universitaire

1980

Studies on vinblastine-induced autophagocytosis in mouse liver

1980

The origin of the membranes of autophagic vacuoles (AV) and acquisition of acid phosphatase into AV's were studied in vinblastine-induced autophagocytosis (VBL, 50 mg/kg, i.p.) in mouse hepatocytes. Using unbuffered OsO4, very intense staining was observed in the outer cisternae of the Golgi apparatus and also frequently in the cavity between the double membranes obviously destined to form AV's as well as in the cavity between the double membranes of newly formed AV's. There may occur a transformation process in the membranes limiting an AV analogous to that observed at the Golgi cisternae. The transformation of the outer AV membrane occurs independently of fusion with lysosomes. Inosine di…

A propósito de una forma cerámica del bronce Valenciano

1980

Feudalidad, burguesía y campesinado en la huerta de Valencia [Prólogo]: la estructura agraria de la particular contribución de Valencia ante la crisi…

1980

La propiedad de la tierra en el tránsito entre el antiguo régimen y la era liberal en Valencia y en el conjunto de la península.

El yacimiento de superficie de El Prat (Llíria, Valencia)

1980

Umsetzung von amino-aziminen mit basen

1980

Abstract Amino-azimines of type (1) react at room temperature with bases (ammonia, aliphatic amines, hydrazine and methyl-hydrazine, aqueous/ethanolic sodium hydroxide) by cleavage of the to the and the NNN moieties (azide).

Semiempirical calculations of shell model states in 212Rn

1980

Anodic oxide films on tungsten—II. The morphology and dissolution of the films

1980

Abstract Scanning electron microscopy was used to investigate the morphology of anodic oxide films on tungsten, obtained in various conditions of anodization. Studies were made of the growth of porous films, whose thickness increases with time and depends upon the current density. Temperature and electrolyte composition influence the film morphology. Gravimetric measurements of film dissolution at 70°C show that after a transient time, the rate of metal dissolution and that of film formation coincide. The porous films thicken because tungsten dissolves as WO 2 2+ and precipitates as WO 3 .H 2 O.

El empréstito de 1896 y la política financiera en al guerra de Cuba

1980

Análisis de los problemas financieros surgidos a propósito de los conflictos coloniales de fines del siglo XIX en España.

Mössbauer effect study of the electronic ground state of iron(II) in [57FexM1−x(bipy)3](ClO4)2 (M = Mn, Ni, Zn) and [57FexM1−x(phen)3](ClO4)2 (M = Ni…

1980

Earlier work in our laboratory on the effect of metal dilution on the 5T2(Oh ⇌ 1A1(Oh) equilibrium in polycrystalline spin crossover systems of iron(II) has shown that the relative stability of the high spin state, 5T2(Oh), at a given temperature, increases markedly with decreasing iron concentration. These results have initiated the present work. Using 57Fe Mossbauer spectroscopy, we have investigated the electronic ground state of iron(II) in the highly diluted solid solutions [FexM1−xL3] with L = bipy, M = Mn, Ni, Zn, x ≲ 0.005 and L = phen, M = Ni, Zn, x ≲ 0.005. Although the critical field potential (Vc) of the pure iron complexes, which are known to be low spin, is reported to be not …

Fuerzas productivas y producción agraria en el País Valenciano: crecimiento y crisis en el campo de Elche (1750-1850)

1980

El crecimiento y la crisis económica y social en el campo de Elche, entre 1730 y 1850, sirve como caso de estudio para plantear el problema del conflicto resultante entre la transformación agraria y la estructura de las relaciones sociales de producción heredada del Antiguo Régimen

El llano de inundación del Xúquer (País Valenciano): Geometría y repercusiones morfológicas y paisajísticas

1980

Política estatal en relación con el transporte de la naranja valenciana durante el gobierno 'largo' de Maura(1907-1909)

1980

Catàleg-regesta del fons local de la secció de pergamins de l'Arxiu municipal de Sueca.

1980

Catàleg dels pergamins documentals de l’arxiu municipal de Sueca integrat per documents de caràcter públic i privat i d’una amplia cronologia entre el segle XIII i el XVII.

Un nuevo caso de iter privatus en una inscripción rupestre de Algimia de Almonacid (El Alto Palancia, Castellón)

1980

Localizada en diciembre de 1979 la inscripción se encuentra emplazada en las proximidades del Pico Espadán (1.083 m.), a unos 2'5 kilómetros al SO. rodeada en sus inmediaciones por elevaciones que rodean los 800 m. Está grabada a unos 3'30 m. del suelo en una peña rodeada en sus inmediaciones por elevaciones que rodean los 800 m.

Spin crossover in solid solution

1980

Abstract The temperature dependent high spin (HS) ⇌ low spin (LS) transition, otherwise called spin crossover, has been well established for many first-row transition metal complexes, particularly for complexes of iron(II) [1]. The phenomenon has been observed mostly in the crystalline state, but also in solution. The spin crossover characteristics have been found to depend on various chemical influences, such as ligand substitution, the nature of the non-coordinating anion and the crystallizing solvent. It has been shown by 57Fe Mossbauer spectroscopy that the spin crossover behaviour in the solid solutions of [FexZn1−x(2-pic)3] Cl2·EtOH (2-pic = 2-picolylamine) is also susceptible to meta…

Polarographische Bestimmung von Chrom(III) nach Extraktion als Chrom(III)-oxinat mit geschmolzenem Oxin

1980

Nach Extraktion von Chrom(III)-Losungen mit geschmolzenem Oxin ist die polarographische Bestimmung nach Nitrierung des gebildeten Chrom(III)-oxinats moglich. Die experimentellen Bedingungen fur die Nitrierung und die polarographische Bestimmung von 1–25 μg Cr/25 ml werden mitgeteilt. Ein kurzer Vergleich mit der spektralphotometrischen Bestimmung als Chrom(III)-oxinat wird gegeben. Das polarographische Verfahren ist um den Faktor 5–10 empfindlicher. Nur Kobalt stort und mus durch eine vorausgehende Extraktion abgetrennt werden.

English as a foreign language in Finland

1980

L'estimation de trends logistiques : une approche nouvelle d'un thème ancien

1980

Estimations comparées de trends logistiques

1980

Référence interne : 80029

Italienische Soziologie unter Einschluss der Spanischen und Südamerikanischen Soziologie

1980

Frankreich und England sind die beiden Lander, in denen schon zu Beginn des 18. Jahrhunderts die Idee der gesellschaftlichen Eigengesetzlichkeit vorhanden und diese Eigengesetzlichkeit Gegenstand wissenschaftlicher Untersuchungen ist. Die Soziologie hat in diesem Sinne hier eine lange Tradition, eine Tradition, die, wie wir sahen, fur Deutschland durch den deutschen Idealismus rezipiert worden war. Die hier erarbeiteten theoretischen Konzepte unterschieden sich im einzelnen sehr deutlich voneinander, hatten aber das gemeinsam, das sie von einer allgemeinen gesellschaftlichen Eigengesetzlichkeit ausgingen und diese zum Gegenstand wissenschaftlicher Untersuchungen machten. Die vorhandenen Ins…

α ⇌ β transition in quartz

1980

La industria de alpargatas en Vall D'Uixó

1980

La Vall D'Uixó: Estructura de un núcleo industrial e inmigratorio (1940-1975)

1980

Die Durchblutung der Magenschleimhaut nach selektiver proximaler Vagotomie — eine experimentelle Studie am Hund

1980

Die Vagotomie, insbesondere die selektive proximale Vagotomie (SPV), gilt heute in der elektiven Ulcuschirurgie als das Verfahren der Wahl. In vielen experimentellen und klinischen Studien wurden die Langzeitveranderungen der Sauresekretion, der gastrointestinalen Hormone, der Magenmotilitat und des duodenogastrischen Refluxes mit ihren gegenseitig sich beeinflussenden Mechanismen untersucht. Die Magendurchblutung, die auch zu den Kontrollmechanismen der Magensaftsekretion gerechnet wird, wurde jedoch nur sehr selten mitbestimmt (2, 3, 4). In dieser Studie wurden daher die Langzeitveranderungen der Magendurchblutung nach SPV untersucht.

Histochemical and biochemical investigations concerning the function of larval oenocytes of Tenebrio molitor L. (Coleoptera, Insecta).

1980

Larval oenocytes of Tenebrio molitor were investigated histochemically. In contrast to the lipid droplets of the fat body, they did not stain with Sudan black. A positive reaction for lipoproteins appeared only after destructive oxidation with sodium hypochlorite. These lipoproteins are the remnants of degenerated membranes, as revealed by ultrastructural analysis. Polyphenols could be identified in the exocuticle of exuvia, and in the newly formed procuticle. Endocuticle, epidermis and oenocytes showed no staining reaction. In oenocytes a great amount of lipase is also present which could be detected with several Tweens as substrates. The significance of these lipases remains unclear, sinc…

Para una lectura contemporánea de lo radical/1

1980