showing 36 of ~574560 from 574555 documents
Anàlisi epistemològica de la percepció : cap a un realisme epistèmic
1987
Die selektive invers-voltammetrische Bestimmung des Antimons in salzsauren Lösungen nach Lösungswechsel in einer einfachen Durchflußzelle
1987
The selective invers-voltammetric determination of antimony in a simple flow-through cell in hydrochloric acid solutions is described. After double medium exchange for post-electrolysis and inverse-voltammetric determination, the determination of antimony is possible in the presence of a large excess of copper, bismuth and other elements. The limit of determination is 0.2–0.3 ppb Sb, the reproducibility 1.5% (10 ppb Sb).
Factors affecting adventitious bud induction in Pinus elliottii (Engelm.) embryos cultured in vitro
1987
Embryos of slash pine (Pinus elliottii Engelm.) were induced to form adventitious buds when placed in culture on nutrient media supplemented with cytokinin. Buds were induced on media containing Risser & White major salts. The high content in nitrogen of Murashige & Skoog formulation seems to be deleterious for this in vitro system, since morphogenic responses were only promoted when nitrogen concentration was drastically reduced in the macronutrient formulation. Factors such as concentration of cytokinin (6-benzyladenine) and time and method of exposure (liquid or solid induction medium) strongly influenced bud formation and development. The greatest number of buds and shoots were obtained…
Age-dependent shift-to-the-right in the localization of colorectal adenomas.
1987
The age-dependent prevalence and topographical distribution of colorectal adenomas was investigated in 1006 unselected autopsies (554 males and 452 females) in Mainz, FRG. In 200 out of 1006 autopsies (19.8%) a total of 498 adenomas of the large intestine were detected. The percentage of patients with adenomas increased continuously with age. Only 6% of all adenomas were localized in the caecum and 8% in the rectum, whereas all the other adenomas were distributed rather evenly throughout the ascending colon (23%), the transverse colon (25%), the descending colon (15%) and the sigmoid colon (23%). Analyzing the topographical distribution of adenomas for definite age groups (40-59, 60-69, 70-…
Effects of an earth-strength magnetic field on pineal melatonin synthesis in pigeons
1987
Valore aggiunto (Imposta sul) (IVA)
1987
Voce dell'enciclopedia relativa all'imposta sul valore aggiunto
Textile : production et mode. 112e Congrès national des sociétés savantes
1987
ISBN : 2-7355-0153-1; International audience
Phase I/II Trial of High-Dose Cytosine Arabinoside and Mitoxantrone in Adult Refractory Acute Myeloid Leukemia
1987
In spite of a high initial response rate of 60% –80% the vast majority of adult patients with acute myeloid leukemia (AML) still cannot be cured of the disease and ultimately die from recurrent and refractory leukemia. The development of new therapeutic approaches and of more effective drugs therefore seems warranted.
Biogéographie des ammonites jurassiques et reconstitution palinspastique de la Téthys
1987
Resume— La distribution geographique des ammonites jurassiques est regie par deux causes fondamentales : l’ecologie et l’histoire evolutive (evenements vicariants). L’analyse conjointe de ces deux facteurs permet de reconnaitre : d’une part des taxons dont la distribution est essentiellement controlee par des contraintes ecologiques (Phylloce-ratinae et Lytoceratinae, lies a des environnements oceaniques profonds; Clydoniceratidae et Proplanulitinae lies a des plates-formes assez superficielles); d’autre part des taxons dont l’histoire evolutive est associee a des evenements vicariants (Ammonitina liasiques euro-boreales et Cardioceratidae-Kosmoceratidae boreaux du Jurassique moyen).Les exe…
Two guaianolides from Centaurea collina
1987
Abstract Two guaianolides isolated from the aerial parts of Centaurea collina were identified as 3β-hydroxy-8α-epoxymethylacriloiloxy-4(15),10(14),11(13 and its 11β,13-dihydro derivative by spectroscopic methods.
Intervention de José Vidal-Beneyto sur « Medias, Pouvoirs et Démocratie »
1987
Взаимодействие пионеров и октябрят в коллективе пионерской дружины
1987
Advisor: Шпона, Аусма
El enclavado intramedular en las pseudoartrosis infectadas
1987
Los autores rev isan los casos de pscudoarirosis infectadas del miembro inferior. en los que se ha usado corno método de tratamiento el enclavijado intrarnedular. A partir del estudio de los nueve casos tratados en la Unidad de Sépticos durante el período 1\)72·1 \)83 se juzgan las ventajas e inconvenientes de este método y se discuten sus indicaciones.
Poblamiento y toponomástica de La Vall de Gallinera islámica
1987
ESTE ESTUDIO, CENTRADO EN EL ANALISIS DE LOS TEXTOS MEDIEVALES Y MORISCOS QUE SE POSEEN SOBRE LA VALL DE GALLINERA (PROVINCIA DE ALICANTE), TRATA DE DESTACAR EL IMPORTANTE PAPEL QUE JUGARON LAS REPOBLACIONES DE LA ZONA: PARECE QUE LAS FAMILIAS MUSULMANAS ALLI ASENTADAS A PARTIR DEL SIGLO XIII FUERON LAS QUE DIERON NOMBRE A LOS PEQUEÑOS POBLADOS DEL VALLE. HASTA AHORA EL ORIGEN DE DICHOS TOPONIMOS SE HABIA VENIDO ATRIBUYENDO AL PERIODO ANTERIOR A LA CONQUISTA CRISTIANA (A)
Modulation of induced reversion frequency by nucleotide pool imbalance as a tool for mutant characterization.
1987
Addition of thymidine (TdR) or deoxycytidine (CdR) to the culture medium during posttreatment incubation affected the frequency of mutagen-induced reversion in three hypoxanthine-guanine phosphoribosyl transferase-deficient mutants of V79 Chinese hamster cells. With two of the mutants (E20 and I3), reversions induced by N-ethylnitrosourea, ethyl methanesulfonate, and methyl methanesulfonate were enhanced by TdR and were either decreased (E20) or not affected (I3) by CdR. With the third mutant (E21), alkylating agent-induced reversions were enhanced by CdR and decreased by TdR. Finally, 6-amino-2-hydroxypurine induced reversions were enhanced by TdR in mutant I3 and were decreased by TdR or …
Arheoloģija un etnogrāfija, 15
1987
Šķiru cīņa un kultūras attīstības problēmas Latvijas PSR (XIX gs. - XX gs.)
1987
Tematiskais zinātniskais rakstu krājums sniedz jaunu materiālu un skaidrojumus vairākos Latvijas vēstures, šķiru cīņas un kultūras vēstures jautājumos.
Antikonvulsiva, 5. Mitt. Substitutionsreaktionen im System des 2,4-Dichlor-6-(diallylamino)-1,3,5-triazins
1987
Als gemeinsames Charakteristikum einer Reihe von Antikonvulsiva tritt der sechsgliederige Stickstoffheterocyclus auf, wie in dem besonders zur Behandlung von Grand-mal- und partiellen Anfallen herangezogenen Primidon oder dem allgemein bei verschiedenen Epilepsieformen einsetzbaren Phenobarbital. Ein neuer Zugang zu solchen sechsgliederigen Heterocyclen ist in jungster Zeit bei unseren Studien uber Substitutionsreaktionen an Heterocyclen entwickelt worden, aus denen die antivirale Wirkstoffgruppe der Chlor-dihexylamino 1,3,5-triazine hervorgegangen ist. Zu den wirkungsstarksten Vertretern dieses Strukturtyps ist das bei Encephalomyocarditis- Virus als Interferon-Induktor fungierende 2-Chlor…
El placer de lo real. Equívocos y derivas de la comedia cinematográfica
1987
El presente texto analiza la función del gag en la risa cinematográfica.En este sentido, procede a una distinción entre lo cómico y la comedia, estableciendo las relaciones entre narración y explosión cómica.
Ataques franquistas sobre Valencia durante la guerra civil : 1936-1939
1987
Este artículo enmarcado en la provincia de Valencia sobre la Guerra Civil Española, trata de estudiar un capítulo de la guerra no muy conocido en esta ciudad de Valencia, que supuso el ensayo de algunos nuevos métodos: los bombardeos sobre la población civil que después, en la Segunda Guerra Mundial, mataron a miles de personas. Por otro lado, estudia los ataques sobre los barcos mercantes, que comerciaban con la España Republicana. This article enclosed in the Valencia Province about the Spanish Civil War, tries to study one chapter of the war not well known in this city of Valencia, that supposed the rehearsal of some new methods: the bombardment of the civil population, that later on, i…
Efecto de la repetición estimular sobre la facilitación en el tiempo de acceso
1987
Study of Rotational Relaxation Fitting Laws from Calculation of SRS N2 Q-Branch
1987
0301-0104
Hallazgos Numismáticos 1985-1986
1987
Infrared bandshapes of intramolecularly H-bonded systems—III. Vibrational dephasing of vs (OH) in 2,6-dichlorophenol
1987
Abstract The shape of the v s (OH) absorption band of intramolecularly H-bonded 2,6-dichlorophenol was measured in a series of solvents of increasing polarity and quantitatively analyzed. A distinct dependence of band positions, shape parameters, band moments, integrated intensities, correlation functions and correlation times on the polarity of solvent has been found. Vibrational dephasing due to dipole—dipole interactions seems to be an important relaxation pathway determining the bandshape in the studied systems.
Kult Jana Dzierżona w Polsce
1987
Chopelain,1987 CHOPELAIN (P.).-Notice sur les carreaux à estampage et inscriptions du Charolais, Revue périodique La Physiophile n°106, juin 1987, p.…
1987
TESSY: Ein Tennis-Simulations-System
1987
TESSY ist ein TEnnis-Simulations-SYstem, das auf der Grundlage eingegebener Spielstarkedaten optimale spieltaktische Konzepte berechnet und u.a. fur Spielsimulation verwendet.
Ground and first excited electronic state interaction of FAD with some β-carboline derivatives
1987
Abstract The spectrophotometric and thermodynamic properties of molecular complexes of flavine adenine dinucleotide (FAD) with some dihydro β-carboline derivatives have been investigated in aqueous solution. The molecular associations have been examined by means of electronic absorption spectra, since in each a new charge-transfer band has been located, and also the variation of the fluorescence emission of FAD on the solutions has been observed. The formation constants for the molecular complexes were determined from absorption data, using the Foster-Hammick-Wardley method. The quenching fluorescence phenomena observed in FAD is related to the concentration of the dihydro β-carboline deriv…
The Distribution of Carcinogen Metabolizing Enzymes in the Mouse Liver: Comparison of Parenchymal and Non-Parenchymal Cell Populations
1987
The distribution of aminopyrine N-demethylase (APND), ethoxy- resorufin O-deethylase (ERRD), epoxide hydrolase (EH) and glutathione transferase (GST) activities in parenchymal (PC) and non-parenchymal (NPC) cell populations of control and Aroclor 1254-treated C57BL/6N and DBA/2N mice was determined. Furthermore, the metabolism of benzo(a)- pyrene (BP) in PC and NPC of both Aroclor 1254-treated mice strains was examined. Measurable activities of all enzymes investigated were detected in control PC as well as NPC of both mice strains; in all instances the PC possessed greater enzyme activities than did the NPC. The PC and NPC of DBA/ 2N mice had significantly lower ERRD and EH activities than…
Nuestra experiencia con la tecnica de magnuson stack modificada en la luxacion anterior de hombro. Una buena opcion
1987
The authors report 66 recurrent anterior dislocation of the shoulder treated with Magnuson Stack's surgycal technique. According to the authors' records the obtained results are very good and good (86'36%) and relapse (4'54%).
K 0 --> pi 0 gammagamma decays in chiral perturbation theory
1987
The decays K L,S --> pi 0gammagamma are calculated within the framework of chiral perturbation theory. The amplitude for K L --> pi 0gammagamma is found to be finite at the one-loop level yielding a branching ratio of 6.8 × 10 -7. The decay spectra of both decays are very characteristic and provide good tests of the effective chiral symmetry realization of the standard model.
Mode of action of the herbicide siduron on wheat
1987
International audience
Diseño de sistemas Mono, Di y Polinucleares de Cu(II) y ligandos tridentados planos : estructura y propiedades magnéticas
1987
Les coûts des nouvelles technologies de l'information dans l'éducation : que savons-nous ?
1987
International audience
Graph grammar engineering: A software specification method
1987
Graphs as conceptual data models are accepted and used in a wide range of different problem areas. Giving some examples we outline common aspects for modeling complex structures by graphs. We present a formal frame-work based on graph grammars to specify graph classes and the corresponding graph manipulations. We show that such a specification can be written in a systematic, engineering-like manner. This is achieved by an extension of the known programmed, attributed graph grammars. Node-set operators are introduced to facilitate graph queries. Concepts like abstraction, decomposition, refinement, parameterization, and integration have been adopted from software engineering to yield a compr…