showing 36 of ~574560 from 574555 documents

VERFLÜCHTIGUNG VON SPALTPRODUKTEN AUS FESTEM URAN(IV)-FLUORID UND ANDEREN FLUORIDEN

1973

In der Kernehemie sueht man nach temperaturund strahlenresistenten Targetsystemen, aus denen naeh Kernreaktionen kurzlebige Nuklide kontinu: ierlich abgetrennt werden kSnne n. Dies ist insbesondere im Hinblick auf die yon der Gesellschaft fiir Sehwerionenforsehung in Darmstadt geplanten Experimente interessan~, bei denen die Synthese neuer, iibersehwerer Elemente versucht wird. Als Modell fiir Verdampfungsstudien aus festen Targets wurde die tr~gerfreie Verfliichtigung yon Spaltprodukten aus festem Uran(IV)-fluorid gew~hlt [1--3]. Im fliiehtigen Anteil konnten folgende Elemente identifiziert werden: Se, Kr, Zr, Iqb, Me, Te, Ru, Sn, Sb, Te, J und Xe. In einem Rohr mit Temperaturgradienten l~…

StereochemistryChemistryPhysical and Theoretical Chemistryract

Determination of gunshot residues by neutron activation analysis

1973

Systematic investigations of gunshot residues, deposited around the bullet hole, have been carried out. The traces were produced by firing on filter papers from distances of 5 to 200 cm using one rifle and three pistols as arms. Antimony, lead and barium were quantitatively determined after irradiating the samples in the nuclear reactor TRIGA Mainz by measurement of gamma-lines of122mSb,122Sb,207mPo and139Ba. The determinations were made purely instrumentally and-where the half lives were long enough-also after chemical separation of the nuclides. The amount of the elements were determined in dependence of the firing distance and of the area around the bullet hole.

ChemistryHealth Toxicology and MutagenesisRadiochemistryPublic Health Environmental and Occupational HealthAnalytical chemistrychemistry.chemical_elementBariumNuclear reactorPollutionAnalytical Chemistrylaw.inventionTRIGAChemical separationNuclear Energy and EngineeringAntimonylawRadiology Nuclear Medicine and imagingNuclideNeutron activation analysisSpectroscopyJournal of Radioanalytical Chemistry

Microcinematographic Studies of Mycoplasma hominis Cells

1973

Cells of two strains of Mycoplasma hominis growing in liquid medium on a glass surface were observed continuously, and cinematographic pictures were taken. Most of the observed structures showed reversible changes of their shape, suggesting the presence of contractile material in membrane or cytoplasma. The frequency and speed of such variations were measured. The deformations seem to be related to multiplication. The mechanisms of these phenomena are unknown.

PhotomicrographyCytoplasmCell divisionMotion PicturesLiquid mediumMycoplasma hominismedicine.disease_causeMicrobiologyCell membraneMycoplasmaCell MovementmedicineMicroscopy Phase-ContrastMolecular BiologybiologyMotion Pictures as TopicCell MembraneCell movementMycoplasmabiology.organism_classificationCulture MediaMorphology and UltrastructureCell biologymedicine.anatomical_structureCytoplasmCell DivisionJournal of Bacteriology

Further experiences on unsteady seepage flow

1973

The present paper describes the results of a study on the unsteady flow in a horizontal homogeneous filter, which is accomplished when the level of the reservoir that recharges the filter is instantly drawn up. This study was carried out at the University of Palermo Institute of Hydraulics as a part of a research program concerning artificial recharge of ground water and the geotechnical problems involving the stability of porous media subject to the variations of surrounding pressures. A numerical procedure, aiming at solving the equation of Boussinesq by a finite difference method, was adopted and an electronic computer was used. A Hele-Shaw filter model was used to carry out several expe…

Mathematical modelComputer scienceHydraulicsMechanical EngineeringFinite difference methodMechanicsGroundwater rechargeCondensed Matter PhysicsStability (probability)law.inventionFilter (large eddy simulation)Mechanics of MaterialslawFluid dynamicsPorous mediumMeccanica

A new neuraminic acid derivative and three types of glycopeptides isolated from the Cuvierian tubules of the sea cucumber Holothuria forskali

1973

The Cuvierian tubules of Holothuria forskali Della Chiaje, a sea cucumber found in the Adriatic Sea, were investigated with regard to their carbohydrate moieties. From a Pronase digest of these tubules three types of carbohydrate units were isolated and characterized. 1. A high-molecular-weight glycopeptide fraction was shown to contain sulphated polyfucose, galactosamine, a uronic acid and a previously unknown neuraminic acid derivative. The sulphate was shown by i.r. analysis to be present as an O-ester. The carbohydrate unit was linked O-glycosidically to threonine and serine residues in the polypeptide chain. The hitherto unknown neuraminic acid derivative (Hf-neuraminic acid) was resis…

ElectrophoresisChromatography PaperCarbohydratesUronic acidHydroxylysineBiochemistrychemistry.chemical_compoundSpecies SpecificityNeuraminic acidAnimalsAmino Acid SequenceGlycosidesAmino AcidsThreonineMolecular BiologyFucosechemistry.chemical_classificationHolothuria forskalibiologyGlycopeptidesGlycosideHexosaminesGlycosidic bondCell BiologyHydrogen-Ion ConcentrationSulfuric Acidsbiology.organism_classificationGlycopeptideAmino acidMolecular WeightUronic AcidsBiochemistrychemistryPronaseChromatography GelNeuraminic AcidsChromatography Thin LayerPeptidesEchinodermataBiochemical Journal

Der Zerfall des94Sr

1973

The nuclide94Sr was isolated by chemical separation methods after thermal neutron induced fission of235U. Its decay properties were investigated employing semi-conductor spectrometers and coincidence techniques. A half-life of 74.1±0.3 sec was found. Besides the 1428.3 keV γ-ray we found 4 new γ-rays which could be placed in a decay scheme comprising three excited states of94Y. The 1+ states in theuu-nuclides90,92,94Y and88,90,92Rb are compared.

Nuclear physicsChemical separationPhysicsNuclear and High Energy PhysicsDecay schemeSpectrometerFissionExcited stateNuclear fusionAtomic physicsNeutron temperatureCoincidenceZeitschrift für Physik A Hadrons and nuclei

On the interpretation of optical illusions.

1973

If excited by stimuli adjacent in space and time, the optical system frequently perceives illusions in the form of apparent movements. These effects may be attributed to the dynamic properties of the retinal nerve nets. On the basis of a specific psychophysical experiment the mechanism underlying the generation of optical illusions is interpreted by the methods of systems theory and its use in systems analysis is discussed. It is shown that for the perception of apparent movements the transit times of the signals in the dendrites are particularly important.

PhysicsBionicsInterpretation (logic)genetic structuresbusiness.industryOptical illusionmedia_common.quotation_subjectComplex systemIllusionTransit timeGeneral MedicineIllusionsPerceptionVisual PerceptionHumansComputer visionArtificial intelligencebusinessEvoked PotentialsVision Ocularmedia_commonCognitive psychologyKybernetik

Abbau von polystyrol in cyclohexanlösung bei kleiner schergeschwindigkeit

1973

Materials sciencePolymer chemistryDie Makromolekulare Chemie

Comperative studies with Culex pipiens egg rafts. Immunogenetic, electrophoretic and enzymatic analysis of unfertilized, compatible and incompatible …

1973

By applying immunologic, electrophoretic and enzymatic methods, extracts of different raft types of Culex pipiens were analysed. Rafts of the crosses Pa x Pa and Ha x Ha contained four common antigens, while unfertilized rafts of Pa and Ha (no antisera were prepared against them) and rafts of the crosses Og x Og, Og x Pa, and Pa x Og shared three common antigens with the remaining raft extracts. Disk-electrophoresis of raft extracts in acrylamide gel resulted in different electropherograms. Ten protein bands were common to all these raft types. The unfertilized rafts of Pa and Ha yielded three more protein bands, the crosses Pa x Ha and Ha x Pa one more, the crosses Og x Og and Pa x Og thre…

chemistry.chemical_classificationContext (language use)General MedicineRaftBiologyOuchterlony double immunodiffusionIsozymeMolecular biologyAminopeptidaseEnzymechemistryBiochemistryGeneticsAlkaline phosphataselipids (amino acids peptides and proteins)Agronomy and Crop SciencePolyacrylamide gel electrophoresisBiotechnologyTAG. Theoretical and applied genetics. Theoretische und angewandte Genetik

Divalent metal ion buffers with low pH-sensitivity

1973

Es werden Puffersysteme fur divalente Metallionen beschrieben, die im Bereich von etwa pH 6–10 gegenuber den herkommlichen Metallpuffern eine bemerkenswert niedrige pH-Abhangigkeit der Metallionenkonzentration und der Pufferkapazitat zeigen. Die Puffersysteme bestehen aus einem starken Komplexbildner (vorzugsweise einer Polyaminocarbonsaure) und zwei verschiedenen, divalenten Metallionen, die bezuglich der Bindung durch den Komplexbildner in Konkurrenz stehen. Dasjenige Metallion, dessen Konzentration gepuffert werden soll, wird als Primarion bezeichnet. Das zweite Ion, das Sekundarion genannt wird, soll vom Komplexbildner mindestens um den Faktor 10–100 schwacher gebunden werden. Die Gesam…

PharmacologyCellular and Molecular NeuroscienceChemistryDivalent metal ionsMolecular MedicineCell BiologyMolecular BiologyNuclear chemistryExperientia

Die zweifache unterdrückung der polymerisation einiger bis(methacrylsäureester) mittels radikalischer additionsreaktionen

1973

Aus Hydrochinon, Resorcin, Dihydroxydiphenylen und Dihydroxynaphthalinen wurden mit Methacrylsaurechlorid Bis(methacrylsaureester) hergestellt. Setzte man diese in siedendem Benzol mit groser Verdunnung gelosten Ester dem Angriff von Radikalen aus α.α′-Azoisobuttersauredinitril (Primarradikale) aus, dessen Uberschus in Beziehung zum Ester mindestens zwanzigfach molar war, so erhielt man mittels saulenchromatographischer Trennung Verbindungen, bei denen je olefinische Doppelbindung zwei Primarradikale addiert waren (unterdruckte Polymerisation). Die Struktur dieser Produkte wurde mittels Elementaranalyse, Molekulargewichtsbestimmung, IR- und 1H-NMR-Spektren bewiesen. Demnach kann die Polymer…

chemistry.chemical_classificationchemistry.chemical_compoundMolar concentrationColumn chromatographychemistryHydroquinoneMethacrylic acidDouble bondPolymerizationRadicalPolymer chemistryResorcinolDie Makromolekulare Chemie

On the variational approach to Jastrow correlations in nuclei

1973

The variational equation determining the Jastrow correlation function is investigated with particular emphasis on the healing problem for both nuclear matter and finite nuclei. The consequences of several healing conditions are discussed. Furthermore, influences from the choice of the single particle basis and from long range correlations are studied and are found to be small in the short range region.

PhysicsNuclear and High Energy PhysicsRange (mathematics)Correlation function (statistical mechanics)Basis (linear algebra)Variational equationQuantum electrodynamicsNuclear TheoryNuclear fusionStatistical physicsNuclear matterInteraction rangeZeitschrift für Physik A Hadrons and nuclei

Mutagenit�tspr�fung bestrahlter Lebensmittel mit dem ?dominant lethal test?

1973

An insgesamt 716 Ratten und 750 Mausen wurde eine mogliche mutagene Wirkung einer bestrahlten Nahrung gepruft. Fertilitat, Tragezeitdauer, Wurfgrose, Aufzuchtleistung und Geschlechtsverhaltnis zeigten in 5 aufeinanderfolgenden Rattengenerationen keine Storungen in der Reproduktionsfahigkeit an. Es konnte kein Anstieg der Misbildungsrate bei den Rattenfeten beobachtet werden. Auch die Fruchtbarkeit der mannlichen und der weiblichen Tiere der Mausegeneration war ungestort. Durch den “dominant lethal test” an Ratten und Mausen konnte keine embryotoxische oder mutagene Wirkung der bestrahlten Nahrung festgestellt werden, die sich in mit den verwendeten statistischen Methoden erfasbaren Untersch…

ToxicologyDominant lethalGeneticsBiologyMolecular biologyGenetics (clinical)Humangenetik

Zooloģijas muzeja raksti, Nr. 10 Vertebrata

1973

ЗоологияМлекопитающиеПтицыLatvijas faunaMammaliaZooloģijaZīdītājiЭкология животныхPutniZoologyAvesDzīvnieku ekoloģija:NATURAL SCIENCES::Biology::Organism biology::Animal physiology [Research Subject Categories]

Arheoloģija un etnogrāfija, 10

1973

:HUMANITIES and RELIGION::History and philosophy subjects::Ethnology [Research Subject Categories]:HUMANITIES and RELIGION::History and philosophy subjects::Archaeology subjects::Archaeology [Research Subject Categories]

Ideaux à gauche dans les quotients simples de l'algèbre enveloppante de sl(2)

1973

International audience

[MATH.MATH-RT]Mathematics [math]/Representation Theory [math.RT]General Mathematics010102 general mathematics0103 physical sciences010307 mathematical physics0101 mathematics[MATH.MATH-RT] Mathematics [math]/Representation Theory [math.RT]01 natural sciencesComputingMilieux_MISCELLANEOUSMathematics[ MATH.MATH-RT ] Mathematics [math]/Representation Theory [math.RT]

Movimiento secular de las importaciones trigueras del siglo XV mediante las "Ayudas de la ciudad de Valencia"

1973

:HISTORIA::Historia moderna [UNESCO]HumanidadesUNESCO::HISTORIA::Historia modernaHistoria

Epistolario II, Mayans y Burriel [Resenya]

1973

Reseña

:CIENCIAS JURÍDICAS Y DERECHO [UNESCO]UNESCO::CIENCIAS JURÍDICAS Y DERECHO

Cheminements aléatoires et modèles systématiques d'intervention : bourse des valeurs de Paris

1973

International audience

[SHS.EDU]Humanities and Social Sciences/Education[SHS.EDU] Humanities and Social Sciences/EducationFranceComputingMilieux_MISCELLANEOUSBourseBourse de Paris

La frontera lingüística en las provincias de Alicante y Murcia

1973

GeografíaUNESCO::HISTORIAGeociencias. Medio ambienteGrupo B:HISTORIA [UNESCO]

Polymorphism of C'3 in German, Bulgarian, Iranian and Angola population

1973

Using agarose gel electrophoresis, C'3 was typed in 4 populations. The gene frequencies of the common allele C'3S in these 4 populations were Germans (0.8071), Bulgarians (0.8149), Iranians (0.7920) and Angola (0.9532). The results are discussed.

AdultMalePopulationBeta-GlobulinsIranBiologyGermanGene FrequencyPolymorphism (computer science)GeneticsHumansBulgarianAlleleBulgariaeducationGeneAllelesGenetics (clinical)Geneticseducation.field_of_studyPolymorphism GeneticGermany WestBlood Protein Electrophoresislanguage.human_languageHuman geneticsPhenotypeAngolaAgarose gel electrophoresislanguageFemaleHuman Genetics

THE SNOWMOBILE IN LAPLAND—ITS ECONOMIC AND SOCIAL EFFECTS

1973

GeographyEconomic geographySocial effects

The Geologic History of the Marginal Basins Along the North Shore of the Gulf of Guinea

1973

The North shore of the Gulf of Guinea forms the coastline of Liberia, the Ivory Coast, Ghana, Togo, Dahomey, Nigeria, and the Cameroons (Fig. 1). The westernmost point of the coastal region to be discussed here is Cape Palmas (long 8° W) on the border between Liberia and the Ivory Coast. The easternmost limit is formed by the Cameroons Bight at long 9° 30′ E. The marginal basins are limited to the north by the upper Guinea arch which stretches for more than 2000 km in a west-east direction from Liberia to the Cameroons. In this arch region the metamorphic basement is exposed over wide areas. Some of the details of this basement are discussed by Hurley and Rand, and by Grant in this book. Fo…

ShorePrecambriangeographygeography.geographical_feature_categoryBasement (geology)OceanographyContinental marginShieldCapeMetamorphic rockGeologic historyArchaeologyGeology

Mapas de pendiente: métodos y aplicación

1973

GeografíaUNESCO::HISTORIAUNESCO::HISTORIA::Historia por épocas::Historia antiguaHumanidadesGeociencias. Medio ambienteGrupo BArtículoGrupo C:HISTORIA [UNESCO]:HISTORIA::Historia por épocas::Historia antigua [UNESCO]Historia

El concepto de ente de razón en Kant

1973

UNESCO::HISTORIA::Historia por épocas::Historia antiguaHumanidadesArtículoGrupo C:HISTORIA::Historia por épocas::Historia antigua [UNESCO]Historia

Diätetik und besondere Ernährungsformen

1973

Das griechische Wort „Diaita“ bedeutet Lebensweise. In der hippokratischen Medizin verstand man darunter die Lehre von der „gesunden Lebensweise“. Auf die Ernahrungslehre bezogen stellt sich also die Frage nach der „richtigen Ernahrung“ des gesunden und kranken Menschen.

Para una fenomenología de la angustia en J. P. Sartre

1973

UNESCO::HISTORIA::Historia por épocas::Historia antiguaHumanidadesArtículoGrupo C:HISTORIA::Historia por épocas::Historia antigua [UNESCO]Historia

Le financement des études supérieures par l'emprunt

1973

Aide aux étudiantsComparaison internationalePolitique d'aideInvestissement humain[SHS.EDU] Humanities and Social Sciences/EducationEmpruntPrêt étudiantFinancement éducation familleAnalyse économiqueFrance[SHS.ECO] Humanities and Social Sciences/Economics and FinanceComputingMilieux_MISCELLANEOUSEnseignement supérieur

The Mechanism of Cleavage

1973

StereochemistryChemistryCleavage (embryo)Mechanism (sociology)

Verdauung und Resorption

1973

Unter Verdauung versteht man die hydrolytische Aufspaltung von polymeren Nahrungsbestandteilen zu monomeren durch Enzyme im Magen-Darm-Trakt.

Zusammenfassung der Diskussion zum Thema: „Basisbedarf und Störungen im Wasser-Elektrolyt- und Säure-Basen-Haushalt bei Säuglingen und Kleinkindern“

1973

El rector Blasco y la reforma universitaria de 1787 en Valencia

1973

UNESCO::HISTORIA::Historia por épocas::Historia antiguaHumanidadesArtículoGrupo C:HISTORIA::Historia por épocas::Historia antigua [UNESCO]Historia

Clinical Experiences with Clamp Electrodes in Fetal Scalp for Simultaneous pO2 and ECG — Registration

1973

The development of a scalp electrode for continuous measurement of fetal mean tissue-PO2 and simultaneous registration of ECG respectively fetal heart rate has been described previously (1). The electrode mechanics and electronic equipment must be adapted to the various demands of the birth process and the labor room environment. The technical results are not yet refined, when unfavorable conditions prevail, artifacts may be anticipated. A brief review of the proceedings in electrode clamp measurements should be presented.

Continuous measurementFetusFetal heart ratemedicine.anatomical_structureClampComputer scienceScalpElectrodemedicineElectronic equipmentBiomedical engineering

Spezielle Gesichtspunkte der Korrektur bei Operierten und Traumatisierten Patienten

1973

Es ist heute allgemein bekannt, das die Zuordnung charakteristischer Storungen des Wasser-Elektrolyt-Haushaltes zu den einzelnen klinischen Krankheitszustanden nur in qualitativer Hinsicht erfolgen kann. Selbst unter dieser realistisch anmutenden Einschrankung wird man am Krankenbett immer wieder neue Anregungen zum Nachdenken erhalten.

La escuela pictórica alcoyana: 1769-1969

1973

UNESCO::HISTORIA::Historia por épocas::Historia antiguaHumanidadesArtículoGrupo C:HISTORIA::Historia por épocas::Historia antigua [UNESCO]Historia

Verfl�chtigung von Spaltprodukten aus festem Uran(IV)-fluorid und anderen Fluoriden

1973

In der Kernehemie sueht man nach temperaturund strahlenresistenten Targetsystemen, aus denen naeh Kernreaktionen kurzlebige Nuklide kontinu: ierlich abgetrennt werden kSnne n. Dies ist insbesondere im Hinblick auf die yon der Gesellschaft fiir Sehwerionenforsehung in Darmstadt geplanten Experimente interessan~, bei denen die Synthese neuer, iibersehwerer Elemente versucht wird. Als Modell fiir Verdampfungsstudien aus festen Targets wurde die tr~gerfreie Verfliichtigung yon Spaltprodukten aus festem Uran(IV)-fluorid gew~hlt [1--3]. Im fliiehtigen Anteil konnten folgende Elemente identifiziert werden: Se, Kr, Zr, Iqb, Me, Te, Ru, Sn, Sb, Te, J und Xe. In einem Rohr mit Temperaturgradienten l~…

PhysicsClinical BiochemistryGeneral Materials ScienceGeneral MedicineBiochemistryMedicinal chemistryAnalytical ChemistryFresenius' Zeitschrift f�r Analytische Chemie