showing 36 of ~574560 from 574555 documents
L'importation du bœuf à la période romaine : premières données
1983
consultable sur : http://www.persee.fr/web/revues/home/prescript/article/pica_0752-5656_1983_num_4_1_1389; National audience; Étude des restes de bovins issus du sanctuaire gaulois, d'un puits romain de l'oppidum (deux squelettes de bovins) et d'une fosse (chevilles osseuses de grandes dimensions).
Aproximació a la "Descripción del Reino de Valencia por corregimientos" de Josep Joaquim Castelló (1783)
1983
Multianalysenmethode zur routinemäßigen Bestimmung der Aflatoxine B1, B2, G1 und G2 sowie von Citrinin, Ochratoxin A, Patulin, Penicillinsäure und St…
1983
Eine einfache Methode zur routinemasigen Bestimmung der Aflatoxine B1, B2, G1 und G2 sowie von Citrinin, Ochratoxin A, Patulin, Penicillinsaure und Sterigmatocystin in verschimmeltem Reis, Weisbrot und anderen pflanzlichen Nahrungsmitteln wird beschrieben. Die Mycotoxine werden zunachst mit Acetonitril/4% KCl und Cyclohexan extrahiert und dann mit Dichlormethan ausgeschuttelt. Die Aflatoxine lassen sich nach einer 2-dimensionalen Dunnschicht-Chromatographie in Chloroform/Aceton=9/1 und Dichlormethan/Acetonitril=8/2 fluorometrisch quantitativ bestimmen. Die ubrigen Mycotoxine werden in Toluol/Ethylacetat/Ameisensaure=6/3/1 und Benzol/Essigsaure=8/2 getrennt; zur einwandfreien Abtrennung von …
Periphyton pigment analyses using paper chromatography
1983
Paper chromatography was used to study the community structure, the proportion of degraded chlorophylls to the total pigment content, and the chlorophyll and carotenoid content of the epilithic periphyton algae from Lake Tahoe, California-Nevada. Analyses were made using both samples directly from the lake and cultured periphytic algae. The extraction was made with boiling 100% methanol; two dimensional chromatography was used to separate the pigments. The relative contribution of different pigment fractions to total light absorption by the complete periphyton extract was estimated by planimetric integration of absorption curves. From the pigment structure, estimates were made of the propor…
El regeneracionismo educativo en Rafael Altamira : estudio aproximativo
1983
Acercamiento a la ideología y obra de Rafael Altamira, uno de los máximos representantes del Regeneracionismo Educativo hispano de finales del siglo XIX, principios del XX. Regeneracionismo Educativo hispano de Altamira. Aproximación histórica, social y cultural a la España de la época. Aproximación bibliográfica y análisis del tema educativo a través de su ideario pedagógico. Propuestas de Altamira para la regeneración de la educación tanto en la Enseñanza Primaria como en la Superior. Bibliografía. Documentos de archivo. Investigación histórica. Análisis descriptivo. La vida y obra de Altamira tienen su origen en el Krausismo positivo, que actúa desde unos principios y volación definidas …
La riuada del Xúquer de 1982 i les vies de comunicació
1983
Dialkyldithiocarbamate als Reagentien zur gas-chromatographischen Bestimmung der Metalle
1983
Es wird ein Uberblick uber das capillargas-chromatographische Verhalten einiger Diethyldithiocarbamato-Chelate im Vergleich zu den fluorierten Diethyl-Verbindungen gegeben. Befriedigende Ergebnisse werden mit den nichtfluorierten Verbindungen nur auf kurzen Saulen erhalten. Die Eichkurven fur Nickel und Cobalt sind im Bereich von 0,5 bis 17,5 ng Metall linear. Die Verwendung von Dipropyl- und Diisobutyldithiocarbamaten bringt keine Vorteile gegenuber den Diethyl-Verbindungen.
Einleitung zum Tagungsthema
1983
Migration of bidentate anionic ligands in binuclear compounds derived from 1,2-bis(imino)propyl-palladium(II) complexes
1983
Abstract The complexes [Pd(AB){C(NR)CMeNR}(PPh3)] (I; AB = 2,4-pentanedionate, N-methylsalicylaldiminate, pyrrole-2-N-methylaldiminate; R = p-C6H4OMe) react with ‘MCl2’ (‘MCl2’ = CoCl2, NiCl2, CuCl2, ZnCl2, [PdCl2(NCMe)2], K[PtCl3(CH2CH2)]) to give either the binuclear adducts [(PPh3)(AB)Pd{C(NR)CMeNR}MCl2] (II) or the zwitterionic isomers [(PPh3)Cl2Pd{C( NR)CMeNR}M (AB)] (III) depending on the nature of the metal M and of the anionic ligand AB. The formation of products III is accounted for in terms of an intramolecular migration of ligands between the two metal centers Pd and M of the initially formed MCl2 adducts II.
INFLUENCE OF THE ANODIZATION CONDITIONS ON THE ELECTRONIC PROPERTIES AND CRYSTALLOGRAPHIC STRUCTURES OF THE CORROSION LAYERS ON TUNGSTEN. A PHOTOELEC…
1983
ABSTRACT The influence of morphology, composition and crystallographic structure on the photoelectrochemical behaviour of anodic oxide films on tungsten obtained in various conditions of anodization has been investigated. Different photocurrent spectra and absorption edges were obtained for each type of film. Optical band gaps ranging between 2.55 eV and 3.15 eV were determined for crystalline and amorphous WO 3 films grown in different conditions. The low quantum efficiency of the anodic films must be attributed to the presence of an amorphous (a-W0 3 ) film which controls the transport of the injected photocarriers.
Action of methomyl analogues on maize mitochondria
1983
International audience
Immune Reactions in Liver Diseases
1983
Chronic hepatitis is a heterogeneous syndrome with different underlying etiologies. Viruses (hepatitis B virus, non-A, non-B viruses), drugs and even alcohol are regarded as etiological agents. A further subgroup is autoimmune-type chronic hepatitis in which an immunogenetic predisposition is of major importance. Primary biliary cirrhosis has to be separated from these subgroups of chronic hepatitis.
Repercusiones geomorfológicas de las lluvias torrenciales de octubre de 1982 en la cuenca media del río Júcar
1983
Structure and Dynamics of Liquid Crystalline Polymers from Deuteron NMR
1983
The molecular structures of thermotropic liquid crystalline polymers, which have been synthesized systematically in recent years, are described according to the model of decoupling the molecular motions of the mesogenic groups and the polymer chain by inserting a flexible spacer. The molecular structure is related to the properties of these systems, e.g., phase transition temperatures, mesophases formed, etc. The structure and mobility of a specific side chain, liquid crystalline polyacrylate with phenyl benzoate as a mesogenic group is investigated by deuteron NMR and compared with the behaviour of low molecular weight analogues selectively deuterated at equivalent positions, i.e., at the …
El poder de la imaginación
1983
Sobre la vegetación de la alianza Homalothecio-Polypodion serrati en las montañas valencianas
1983
Se han estudiado las comunidades de la alianza Homalothecio-Polypodion serrati en las montañas de la región valenciana y alrededores, encontrándose que las mismas pueden atribuirse a cuatro asociaciones: Anomodonio-Polypodietum serrati, Saxifragetum cossonianae, Saxifragetum latepetiolatae y Homalothecio-Asplenietum fontani. Se presentan sendas tablas fitosociológicas de cada una de las tres últimas, de las cuales se comentan, asimismo, sus principales notas características. The communities included in the alliance Homalothecio-Polypodio serrati are studied in Valencia region and neighbouring areas. 4 associations can be assigned to them: Anomodonio-Polypodietum serrati, Saxifragetum cosson…
Première hypothèse d'un répertoire d'entrées en sociologie
1983
L'inoculum endomycorhizien : composition et méthodes d'inoculation
1983
National audience
José Vidal Beneyto, profesor y especialista en Comunicación: "Debemos reivindicarnos como actores de la comunicación"
1983
Purification of nucleoside phosphotransferase from mucosa of chicken intestine
1983
The authors describe the purification procedure and some properties of a nucleoside phosphotransferase obtained from chicken intestinal mucosa, the tissue of which in preliminary studies showed the highest specific activity. Sepharose 6B chromatography and electrophoresis on polyacrylamide gel subdivided the enzyme into many forms which represent various levels of an associated multisubunit protein derived by assembly of a component at lower molecular weight. Nucleotide protectors regulate the equilibrium among these different forms, favoring the production and the stabilization of supramolecular complexes of nucleoside phosphotransferase. Similar results were obtained with enzyme purified …
Crónica de la riada del Xúquer (20/21-X-1982)
1983
The Self-Presentation of a Discipline: History of Psychology in the United States between Pedagogy and Scholarship
1983
Criticism of scholarship in the history of psychology from historians and philosophers of science is certainly not new. In 1966, for example, Robert M. Young characterized the field as “an avocation with very uneven standards”, limited primarily to biographies of great psychologists, extended reviews of the literature and the uncritical chronicling of the rise of scientific psychology, based on a narrowly preconceived model of scientific development (1). Recent criticism has renewed all of these charges, particularly the last. Walter Weimer, a psychologist interested in the philosophy of science, accuses the writers of historical textbooks of ‘crypto-justificationism’, of describing the ‘ev…
Le matériel du tumulus de Celles (Cantal)
1983
International audience
Interactions between phytochrome and chlorophyll biosynthesis
1983
International audience
Chômage et formation dans quatre pays européens
1983
International audience
Observational Approach and Perspective
1983
Well you did not cover more than half of my planned talk! (laughter). Let me comment on interferometric techniques, in particular speckle imaging which you mentioned. Doing speckle imaging with the largest telescopes now available will not give you better than the theoretical resolving power of the telescope. With a 4m telescope that is about 30 marc sec in the visible. That happens to be the radius of the supergiant Betelguese. So you are not going to achieve much with speckle imaging on these stars. One technique which has not been adequately exploited is that of lunar occultation which can give much better angular resolution than speckle, of the order of 2-3 marc sec. By using suitably c…
Comment: What is Alternative Technology? A Reply to Professor Stanley Carpenter
1983
Modern man is dissatisfied with the technology we have and would replace it with another. Three very different reasons are given for this. I will divide my treatment of them under three headings, listing the reason in each case together with a reply.
The measurement of light transmission through an irradiated fluidised bed
1983
Abstract The transmission of light through an irradiated fluidised bed with vertical flat walls containing catalytic particles has been experimentally studied. The amount of light transmitted through the reactor was measured at different levels by a photocell. The experimental variables studied included: (i) gas flow rate, varying from 2 to more than 10 times that required for minimum fluidisation; (ii) mean particle size, ranging from 0.138 to 0.275 mm; and (iii) internal bed thickness from 2.1 to 4.9 mm. The effect of the reflectance of the particles was also examined. Results show that the amount of light transmitted through a flat fluidised bed is low. The average transmitted light has …
Intrahepatic Chemotherapy in Isolated Liver Metastases
1983
Most malignant liver tumors in Europe are of metastatic origin. The failure of early detection renders most of these tumors nonresectable at the time of diagnosis.
Les elecciones legislatives del 28 d'octubre de 1982 a la Ribera Alta i Baixa del Xúquer
1983
Cytoplasmic particles associated with CMS in Faba bean (Vicia faba L.)
1983
International audience
La ferritina, investigación de su significado en los trastornos del metabolismo del hierro
1983
El problema de la renta feudal y los fueros. Un análisis de las cartas puebla del siglo XIII en el norte de Castellón
1983
Aportaciones al estudio de la Sarga (Alcoy, Alicante)
1983
This paper deals with a study on the older chromatic phase from La Sarga (Alcoy, Alicante), which is underlaid to the Levantine Art. It is specially important with regard to the last discoveries, because it permits to isolate a new artistic outlook, previous to the Levantine Art, at least in the Northern districts of the province Alicante.
Skelett- und Lebermetastasierung bei Harnblasen- und Hodenmalignomen: Szintigraphie als primäre Stagingmethode?
1983
Die Inzidenz von Skelett- oder Lebermetastasen bei Harnblasen- und Hodenmalignomen, also bei Tumoren, fur welche Skelett und Leber nicht als Metastasierungspradilektionsorgane gelten, wird in der Literatur sehr uneinheitlich angegeben. Je nach Patientenselektion, Intensitat der Stadienabklarung, Metastasenabklarung im Rahmen der Primardiagnostik, im Therapieverlauf oder aber Metastasennachweis erst bei der Autopsie, schwanken die Angaben fur das Blasenkarzinom bezuglich der Skelettmetastasie-rung zwischen 0,9% und 64%, bezuglich der Le-bermetastasierung zwischen 3% und 51%. Fur das Hodenkarzinom werden ebenfalls extreme Schwankungsbreiten von 0,3%–18% bzw. 9%–75% angegeben.