showing 36 of ~574560 from 574555 documents

The average over a sphere

1980

Abstract The N points ri and the N segments ΔΩi of the unit sphere used in the numerical approximation of the average over the sphere are optimized to approximate the average of the set of spherical harmonics {;Yl,m;l = 0, 1, 2, …, L}; up to L = 18. The symmetry of f( r ) can be taken into acount by using only a distinct subquantity of the N point {; r i , ΔΩ i }; . Sets for N = 48n (n = 1, 2, …, 6) are tabulated. The advantage of the method is shown by the calculation of a powder Mossbauer spectrum including electric and magnetic hyperfine interactions.

PhysicsUnit sphereNumerical approximationSpectrum (functional analysis)Mössbauer spectroscopySpherical harmonicsPoint (geometry)General MedicineAtomic physicsHyperfine structureSymmetry (physics)Nuclear Instruments and Methods

On “Action Language” in Psychoanalysis

1980

The main tenets of action language are summarized in an attempt to discern the direction in which psychoanalysis might go if action language becomes the "new metapsychology." The principal roots of action language are traced to the different linguistic/language and personality-and-culture models of anthropology and to the neobehaviorist currents of academic psychology. The authors' findings support the hypothesis that action language is a form os psychoanalytic behaviorism having idealism, logical positivism, and radical empiricism as its philosophical underpinnings. Its adoption would confound the entire motivational aspect of psychoanalysis. Specifically, the authors suggest that action l…

Cognitive sciencePsychoanalysis05 social sciencesLogical positivismMetapsychologyAction languageGeneral MedicineLanguage-game050108 psychoanalysisPsychiatry and Mental healthClinical PsychologyArts and Humanities (miscellaneous)IdealismBehaviorismDevelopmental and Educational Psychology0501 psychology and cognitive sciencesRadical empiricismPsychoanalytic theoryPsychology050104 developmental & child psychologyThe Psychoanalytic Quarterly

Methodical Studies in the Separation of Chlorophyll-Protein Complexes by Polyacrylamide Gel Electrophoresis

1980

Summary Chlorophyll-protein complexes from thylakoids of Sinapis alba plants were separated, using Tris-HCl and Tris-borate buffer in the sodium dodecyl sulphate acrylamide gel electrophoresis. In the electrophoretogram with Tris-borate buffer, 6 bands could be characterized in the gel pattern. In addition to the three major green zones (P-700-chlorophyll a-protein, light-harvesting chlorophyll a/b-protein, free pigment zone), which were also observed in experiments with the Tris-HC1 buffer, three further bands (LHCP 1 , LHCP 2 , CPa) were electrophoretically separated. An elongation of the electrophoretical period resulted especially in a decrease of the proportion of the light-harvesting …

Chlorophyll bChlorophyll aChromatographyElectrophoretogramAnalytical chemistryGeneral MedicineAbsorbanceElectrophoresischemistry.chemical_compoundPigmentchemistryChlorophyllvisual_artvisual_art.visual_art_mediumPolyacrylamide gel electrophoresisZeitschrift für Pflanzenphysiologie

Intermittent Horner's syndrome on alternate sides: a hint for locating spinal lesions.

1980

A patient with a cervical intramedullary ependymoma is described who exhibited a Horner's syndrome on alternate sides. Pharmacological study demonstrated damage to the pre-ganglionic sympathetic neurons. Disregarding cases with the Shy-Drager syndrome, three comparable case reports have been found in the literature where the fluctuating expression of Horner's syndrome, alternating from one side to the other, was attributable to a lesion of the cervical spinal cord. In contrast to the present patient, the pharmacological responses of these patients indicated a lesion of the central sympathetic pathway.

EpendymomaAdultAtropineMalemedicine.medical_specialtySympathetic nervous systemPathologyNeurologyHorner SyndromeSympathetic Nervous SystemEpinephrineAutonomic Fibers PreganglionicSpinal Cord NeoplasmHorner syndromeReflex PupillaryLesionCocaineMedicineHumansSpinal Cord Neoplasmsbusiness.industrymedicine.diseaseSpinal cordmedicine.anatomical_structureNeurologyEpendymomaCiliospinal reflexNeurology (clinical)medicine.symptombusinessJournal of neurology

Comparative study on biological effects of the guinea pig complement-peptide C3a and C3a-related synthetic oligopeptides

1980

Dose-response experiments with guinea pig C3a and a synthetic hexapeptide (amino acid residues 72–77), representing the COOH-terminal sequence of human C3a, were performed in two recently described bioassay systems for C3a, i.e. cytotoxicity against tumor cells measured as LDH and 51Cr-release and non cytolytic serotonin release from guinea pig platelets. Compared to the classical anaphylatoxic assay (guinea pig ileum contraction), nearly identical reactivities were observed in all three test systems with C3a and, although quantitatively different, with hexapeptide.

Blood PlateletsCytotoxicity ImmunologicAnaphylatoxinsSerotoninContraction (grammar)ImmunologyDose-Response Relationship Immunologicchemical and pharmacologic phenomenaPeptideBiologyGuinea pigMiceAnimalsBioassayPlateletCytotoxicityMolecular Biologychemistry.chemical_classificationOligopeptideL-Lactate DehydrogenaseComplement C3Peptide Chain Termination TranslationalCytolysisBiochemistrychemistryBiological AssayOligopeptidesMolecular Immunology

1H-NMR relaxation in polyethylene melts as studied by the deuteron dilution technique

1980

chemistry.chemical_compoundMaterials scienceDilution techniqueDeuteriumchemistryPolymer chemistryGeneral EngineeringProton NMRPhysical chemistryRelaxation (physics)General Materials SciencePolyethyleneJournal of Polymer Science: Polymer Letters Edition

Ist der Kreuznacher Sandstein des Rotliegenden äolisch oder fluviatil entstanden?

1980

Der Kreuznacher Sandstein tritt am Top des Rotliegendprofils in der Umgebung von Bad Kreuznach (nordostliche Nahemulde) auf. Wegen seiner bis uber 3 m machtigen Schragschichtungseinheiten wurde, er bisher als typisch aolischer Dunensandstein gedeutet und an die Wende Rotliegendes / Zechstein gestellt.

GeochemistryGeneral Earth and Planetary SciencesGeologyGeologische Rundschau

Stufenweise darstellung eines cycloheptamers aus p-kresol, 4-tert-butylphenol und formaldehyd. Vergleich mit einem phenolischen, heptanuklearen kette…

1980

A phenolic cycloheptamer (11) and an analogous chain oligomer (10) with nearly the same structure were gained by stepwise syntheses. The cycloheptamer has a higher melting point and a better solubility in chloroform. In contrast to the chain oligomer his infrared spectrum indicates a stronger association of the hydroxyl groups which is not influenced by the solvent. The mass spectra announce a preferred statistical cleavage along the chain of compound 10 and a great stability of the ring of 11 which preferentially loses his substituents. The 1H NMR spectra confirm the constitutions of the chain (10) and ring compound (11). The cycloheptamer is distinguished by a ring inversion or a pseudoro…

chemistry.chemical_compoundChloroformchemistryRing flipPolymer chemistryMass spectrumProton NMRPseudorotationMethyleneRing (chemistry)OligomerDie Makromolekulare Chemie

Le Potlatch scolaire

1980

International audience; Légitimée par les discours des politiciens, par les expertises des économistes et des sociologues et par les intérêts corporatifs des éducateurs, l'entreprise scolaire continue à se développer malgré la montée des désillusions et des griefs à son égard. Censée être l'agent principal de l'égalité des chances et de la mobilité sociale, elle ne joue en réalité ce rôle que très imparfaitement, et ses justifications technologiques sont démenties par la tendance à la déqualification du travail.Pour tenter de comprendre ce mouvement contradictoire avec les effets qu'il engendre, une hypothèse, inspirée du cas français est privilégiée : l'éducation est bien l'un des principa…

[SHS.EDU]Humanities and Social Sciences/Education[SHS.EDU] Humanities and Social Sciences/EducationDonEducation

Ribonuclease H levels in herpes simplex virus-infected cells.

1980

Two forms of ribonuclease H (RNase H) have been identified both in uninfected and Herpes Simplex virus (HSV-)infected BHK cells. Identical RNase H species were detected in control- as well as in infected cells. RNase H I and II have not been found to be associated both with host cell DNA polymerase alpha and beta and HSV-induced DNA polymerase. Infection of BHK cells with HSV type 1 does not lead to a pronounced alteration of RNase H II activity but to an increase (3-fold) of the extractable RNase H I activity. RNase H I activity increases to a maximum between 8-10 hours p.i.; the bulk of HSV-DNA synthesis occurs between 6-8 hours p.i. From these experiments we draw the preliminary conclusi…

Simplexvirusfood.ingredientDNA polymerasevirusesPolynucleotidesmedicine.disease_causeKidneyIsozymeCell LineSubstrate SpecificityfoodRibonucleasesVirologyCricetinaeBaby hamster kidney cellmedicineAnimalsSimplexvirusRNase HbiologyGeneral MedicineVirologyMolecular biologyIsoenzymesMolecular WeightHerpes simplex virusCell culturePolynucleotideEthylmaleimideDNA Viralbiology.proteinArchives of virology

Infections of susceptible and resistant mouse strains with herpes simplex virus type 1 and 2.

1980

The spread of HSV of type 1 and 2 was investigated after intraperitoneal, intraplantar and intracerebral infections of resistant (C57/bl) and susceptible (NMRI) mice. The virus spreads after i.p. infection to the spleen and the liver to the same extent in both strains of mice. However, virus is eliminated earlier in resistant mice. Intracerebral infections revealed a peculiar type of resistance of C57/bl mice especially for type 2 of HSV. HSV multiplies in the thymus at the early stage of infection and can be detected in this organ in sick mice of NMRI strain. HSV-1 and 2 can be detected in the spinal cord of C57/bl mice without sickness or death of these animals.

medicine.medical_specialtyanimal structuresvirusesSpleenHSL and HSVThymus GlandBiologymedicine.disease_causeVirusMiceMedical microbiologyImmunityVirologymedicineAnimalsSimplexvirusCyclophosphamidefungiBrainHerpes SimplexGeneral MedicineSpinal cordVirologyImmunity InnateMice Inbred C57BLHerpes simplex virusmedicine.anatomical_structureLiverSpinal CordInfectious disease (medical specialty)SpleenArchives of virology

Endliche Gruppen, die eine Involution z besitzen, so daβ F∗(C(z)) das direkte Produkt einer extraspeziellen 2-Gruppe von kleiner Weite mit einer elem…

1980

Algebra and Number TheoryStereochemistryMathematicsJournal of Algebra

Lipid metabolism during exercise

1980

Seven physically fit (well-trained, maximal oxygen uptake 69.6 +/- 4.4 ml x kg-1 min-1) and eight less fit (moderately trained, maximal oxygen uptake 56.1 +/- 5.7 ml x kg-1 x min-1) healthy male subjects were exercised for 4 h by bicycle ergometry against a pedalling resistance calculated to cause oxygen consumption corresponding to approximately 30% of each individual's maximal oxygen uptake value. Respiratory exchange ratio was estimated at 1 h and blood glucose and lactate concentrations and muscle glycogen content at 2 h intervals. Muscle glycogen content decreased markedly during the first 2 h of exercise in the well-trained group but was similar after 4 h exercise in both groups. No m…

Blood GlucoseMalemedicine.medical_specialtyPhysiologyPhysical ExertionPhysical fitnesschemistry.chemical_elementBiologyOxygenchemistry.chemical_compoundPhysiology (medical)Internal medicinemedicineHumansOrthopedics and Sports MedicineRespiratory exchange ratioGlycogenbusiness.industryMusclesRespirationPublic Health Environmental and Occupational HealthVO2 maxLipid metabolismGeneral MedicineOxygenRespiratory quotientEndocrinologyBiochemistrychemistryLactatesBicycle ergometerEnergy MetabolismbusinessGlycogenEuropean Journal of Applied Physiology and Occupational Physiology

Regulation of chitin synthase activity inSaccharomyces cerevisiae: Effect of the inhibition of cell division and of synthesis of RNA and protein

1980

The effect of pronase and trypsin on the activation or deactivation (degradation?) of chitin synthase ofSaccharomyces cerevisiae occurs faster in membranous preparations than in toluene-treated cells. When the temperature is raised, the former preparation is deactivated earlier than the latter one. The activity found in growing cells is not modified after inhibition of protein synthesis by cycloheximide or amino acid starvation or by the inhibition of RNA synthesis. It was possible to activate the chitin synthase ofS. cerevisiae cdc 25 grown at 23°C by means of pronase, whereas trypsin had no effect. After the cells were grown at 37°C, chitin synthase could not be activated either with tryp…

chemistry.chemical_classificationCell divisionRNAGeneral MedicinePronaseChitin synthaseCycloheximideBiologyTrypsinApplied Microbiology and BiotechnologyMicrobiologyAmino acidchemistry.chemical_compoundchemistryBiochemistrymedicinebiology.proteinProtein biosynthesismedicine.drugCurrent Microbiology

Influence of processing conditions on some properties of anionically synthesized polycaprolactam in presence of lithium chloride

1980

Nylon 6–LiCl systems of various concentrations were prepared by anionic polymerization of caprolactam in the presence of salt. A depression of both crystallization rate and melting temperature was evidenced through x-ray, density, and DSC analyses. Such a preliminary characterization allowed for choosing the proper conditions in order to obtain amorphous fibers from a spinning operation which was performed at a temperature lower than the pure polymer melting point. These results are of technological relevance, especially in view of obtaining, as in similar cases, large amorphous orientations through a spinning–drawing process and high-modulus fibers after subsequent crystallization. Also, t…

chemistry.chemical_classificationMaterials sciencePolymers and PlasticsCaprolactamGeneral ChemistryPolymerSurfaces Coatings and Filmslaw.inventionAmorphous solidchemistry.chemical_compoundCrystallinityAnionic addition polymerizationchemistryChemical engineeringlawPolymer chemistryMaterials ChemistryMelting pointLithium chlorideCrystallizationJournal of Applied Polymer Science

ESR Spectra o f Normal Human Serum after Treatment with Complement Activating Agents*

1980

Abstract We describe the appearance of a free-radical signal in the ESR spectrum of normal human serum incubated with several complement activating agents. The intensity of this signal is dependent of dose of activating agents, time and temperature. Signals elicited by different complement activators differ in morphology and kinetics. Inhibition by treatment with EDTA and the presence of the signal in activated C 6-deficient rabbit serum suggest that the con-vertase forming steps of complement activation (C2 to 5) could be the source of free-radical containing molecules.

Elapid VenomsMaleFree RadicalsChemistryKineticsElectron Spin Resonance SpectroscopyZymosanBlood ProteinsComplement System ProteinsGeneral Biochemistry Genetics and Molecular BiologyComplement systemComplement (complexity)Esr spectraBiochemistryHumansFemaleComplement ActivationAfter treatmentZeitschrift für Naturforschung C

Coupled rotational and translational modes in the mixed molecular crystal KBr1?x (CN) x

1980

TheE g andT 2g acoustic phonon modes of the molecular crystals KBr0.96(CN)0.04 and KBr0.86(CN)0.14 have been investigated by inelastic neutron scattering at 6, 90 and 300 K. Clear resonances due to mode-mode coupling to molecular excitations were observed. In complementary ultrasonic experiments the elastic constants were found to pass through minima as a function of temperature. The results were quantitavely explained by a model which assumes simple forms of the molecular excitation spectrum. An alternative interpretation, though being only qualitative, postulates a freezing of the CN molecules into a glass-like phase.

CrystalMaxima and minimaCouplingMaterials sciencePhononPhase (matter)MoleculeAtomic physicsCondensed Matter PhysicsInelastic neutron scatteringExcitationElectronic Optical and Magnetic MaterialsZeitschrift f�r Physik B Condensed Matter

Age-dependent differences in the effect of phenprocoumon on the vitamin K1-epoxide cycle in rats

1980

Abstract The anticoagulant activity and the pharmacokinetics of phenprocoumon as well as the effect of phenprocoumon on the vitamin K1-epoxide cycle in younger (12 weeks) and older (36 weeks) male inbred Lewis rats has been examined in a study of the mechanism responsible for the increase in the responsiveness to oral anticoagulant drugs (OAD's) with increasing age. After a single i.v.-dose of phenprocoumon (0†355 mg kg−1 the anticoagulant effect obtained was greater in older than in younger rats. There were no differences between younger and older rats in the rate of elimination, volume of distribution and in the free fraction and free concentration values of phenprocoumon in plasma and li…

VitaminMetabolitePharmaceutical SciencePharmacologyReductasePhenprocoumonchemistry.chemical_compoundPharmacokineticsEthers CyclicmedicineAnimalsPharmacologyVolume of distributionchemistry.chemical_classificationDose-Response Relationship DrugChemistryAge Factors4-HydroxycoumarinsVitamin K 1RatsKineticsEnzymeLiverFree fractionPhenprocoumonEpoxy Compoundsmedicine.drugJournal of Pharmacy and Pharmacology

The decay of 0.57 s114Cs

1980

Fusion reactions between58Ni projectiles and58Ni target nuclei were used to produce114Cs activity, which was studied by on-line mass separation and decay spectroscopy. The obtained half-life of 0.57±0.02 s and the probability ratio of 44±3 between betadelayed proton and beta-delayed alpha emission represent data with improved precision. The absolute branching ratios for both particle decay modes were determined to be (7 ±2)×10−2 and (1.6±0.6)×10−3, respectively. These branching ratios and the shapes of particle spectra are discussed with reference to the statistical model calculations. Groundstate alpha decay of114Cs was observed with an alpha energy of 3,226±30 keV and a branching ratio of…

Nuclear physicsPhysicsNuclear and High Energy PhysicsParticle decayCluster decayDecay schemeProton decayBranching fractionNuclear fusionHigh Energy Physics::ExperimentAlpha decayAtomic physicsDecay correctZeitschrift für Physik A Atoms and Nuclei

T cell factor (interleukin 2) allows in vivo induction of T helper cells against heterologous erythrocytes in athymic (nu/nu) mice.

1980

Mice carrying the nude mutation (nu/nu) lack a functioning thymus and do not contain detectable levels of immunocompetent T cells. We now report that nu/nu mice do have lymphocytes which can be activated in vivo by heterologous erythrocytes and a Lyt-1 T cell-derived factor (interleukin 2) to generate T helper cells. Thus, a lymphokine is described which is able to restore in vivo T helper cell immunocompetence of nu/nu mice. The data may suggest that nu/nu mice contain a low number of T lymphocytes influenced by the cystic remnant of the nu/nu thymus anlage. Alternatively, the data imply that interleukin 2 circumvents the requirement of a thymus during ontogeny of T lymphocytes.

Interleukin 2ErythrocytesT cellT-LymphocytesImmunologyHeterologousMice NudeBiologymedicine.disease_causeMiceIn vivomedicineImmunology and AllergyAnimalsAntilymphocyte SerumMutationMice Inbred C3HSheepLymphokineT helper cellComplement System ProteinsMolecular biologyMice Inbred C57BLmedicine.anatomical_structureImmunologyImmunocompetencemedicine.drugEuropean journal of immunology

Some New Copolymers by Ionic Polymerization

1980

In the first part the cationic polymerization of a homologous series of cyclic ether–acetals with ring sizes of 11, 14, and 17 atoms is described. During the polymerization of triethylene glycol formal (TGF) an equilibrium is reached and besides high polymers cyclic oligomers are formed. The oligomers and the polymers are built up of a regular sequence of one oxymethylene unit and three oxyethylene units –[–(OCH2) (OC2H4)3–]–x. They are therefore be labelled a “sequenced copolymer.” The equilibrium concentrations of the cyclic oligomers with a polymerization degree from 2 to 15 follow the Jacobson–Stockmayer equation. The 14- and 17-membered monomers POC and HOC forms cyclic oligomers and h…

Anionic addition polymerizationChain-growth polymerizationPolymers and PlasticsPolymerizationChemistryPolymer chemistryMaterials ChemistryCationic polymerizationCopolymerLiving polymerizationIonic polymerizationRing-opening polymerizationPolymer Journal

Two-photon exchange in muon-nuclear scattering

1980

We obtain a low-momentum-transfer theorem for positive- and negative-muon--nuclear scattering, in terms of the charge and the electric and magnetic polarizabilities. The result opens the way to use muons as a tool to probe the electromagnetic structure of composite objects. Predictions of this two-photon effect for the asymmetry in the angular distribution of negative and positive muons scattered by /sup 4/He are given.

Elastic scatteringPhysicsNuclear reactionPhotonMuonPhysics::Instrumentation and DetectorsScatteringmedia_common.quotation_subjectCompton scatteringAsymmetryNuclear physicsScattering amplitudeHigh Energy Physics::ExperimentAtomic physicsmedia_commonPhysical Review D

Deoxyribonucleases in Herpes simplex Virus Type 1 and 2 Infected Primary Rabbit Kidney Cells

1980

Abstract In primary rabbit kidney cells infected with herpes simplex virus four different neutral deoxyribonuclease activities can be detected by means of the deoxyribonuclease assay in DNA-containing polyacrylamide gels following their separation by discelectrophoresis. The method is suitable to follow independently the change in each activity of the different enzymes using only about 5 × 105 cells for each assay during the time-course of infection. Under these conditions one enzyme activity is constant, two disappear while the activity of a fourth one present only in infected cells, increases.

chemistry.chemical_classificationDeoxyribonucleasesbiologyChemistryDeoxyribonucleaseCell Transformation ViralKidneymedicine.disease_causeVirologyGeneral Biochemistry Genetics and Molecular BiologyEnzyme assayKineticsHerpes simplex virusEnzymemedicinebiology.proteinRabbit kidneyAnimalsSimplexvirusRabbitsDeoxyribonucleasesCells CulturedZeitschrift für Naturforschung C

Automatic continuity of generalized local linear operators

1980

In this note, we present a general automatic continuity theory for linear mappings between certain topological vector spaces. The theory applies, in particular, to local operators between spaces of functions and distributions, to algebraic homomorphisms between certain topological algebras, and to linear mappings intertwining generalized scalar operators.

Discrete mathematicsPure mathematicsGeneral MathematicsLocally convex topological vector spaceTopological tensor productDiscontinuous linear mapSpectral theoremOperator theoryTopological spaceTopological vector spaceContinuous linear operatorMathematicsManuscripta Mathematica

Production of ionic and atomic beams of alkaline elements

1980

Abstract An on-line mass spectrometer has been developed and used to perform atomic and nuclear spectroscopy on long series of alkali isotopes including nuclei far from stability. The apparatus was on-line either to the ISOLDE mass separator or directly to the PS, proton beam. In the case of atomic spectroscopy, a thermal atomic beam is needed. As ISOLDE delivers 60 keV ions, a high efficiency “ion-to-atom coverter” has been developed. In all cases, an “ionizer” is required to produce 10 keV ions for the ion source of the mass spectrometer. These two special devices are described, their efficiency and the consequent delay times discussed. The different targets which have been developed for …

IsotopeProton010308 nuclear & particles physicsChemistry[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex]General EngineeringAtomic spectroscopy[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]Alkali metalMass spectrometry7. Clean energy01 natural sciencesIon sourceIon0103 physical sciencesPhysics::Atomic PhysicsAtomic physicsNuclear Experiment010306 general physicsBeam (structure)

Force-, power-, and elasticity-velocity relationships in walking, running, and jumping

1980

Ground reaction forces and mechanical power were investigated when the subjects walked normally, while they were racing or running at four speeds, and when they performed the running long jump take-off. In addition, the apparent spring constants of the support leg in eccentric and concentric phases were investigated at the four running speeds, during the running long jump take-off, and in the triple jump. Six club level track and field athletes, four national level long jumpers, and six national level triple jumpers took part in the study. Cinematographic technique and a mathematical model of hopping (Alexander and Vernon 1975) were employed in the analysis. Force and power values were foun…

PhysiologyConcentricmedicine.disease_causeBone and BonesRunningTendonsJumpingPhysiology (medical)medicineHumansEccentricOrthopedics and Sports MedicineGround reaction forceElasticity (economics)Track and field athleticsMechanical energyPhysicsMusclesTrack and FieldMathematical analysisPublic Health Environmental and Occupational HealthBiomechanicsGeneral MedicineMechanicsElasticityBiomechanical PhenomenaMotor SkillsLocomotionMuscle ContractionEuropean Journal of Applied Physiology and Occupational Physiology

Kinetics of coloration of anodic electrochromic films of WO3·H2O

1980

Polycrystalline layers of WO3·H2O are obtained by anodization of tungsten in 1 N H2SO4 at 70° C. The cathodic reduction of these layers in acid solutions causes the formation of blue WO3−x·H2O (0<x⩽:0.12) oxides. The kinetics of coloration are investigated by galvanostatic and potentiostatic techniques. The experimental results are compared with the theoretical data obtained by solving the diffusion equation for a constant flow of oxygen vacancies and for a time-dependent surface vacancy concentration. Except in the initial stage of coloration, the process controlling rate can be ascribed to the diffusion of oxygen vacancies from the oxide-electrolyte interface into the bulk of the layers. …

AnodizingChemistryGeneral Chemical EngineeringDiffusionKineticsAnalytical chemistrychemistry.chemical_elementTungstenElectrochemistryElectrochromismVacancy defectMaterials ChemistryElectrochemistryCrystalliteJournal of Applied Electrochemistry

Radioactively labelled epoxides. Part III. Tritium labelled steroid 16α, 17α-epoxides

1980

Tritium labelled (17-3H) 16α, 17α-epoxy-androst-4-en-3-one and 16α, 17α-epoxy-estra-1,3,5(10)-trien-3-ol have been prepared on a large scale (200-300 mg amounts) with efficient (i.e. activity of product exactly predictable) introduction of label. The preparative method is very inexpensive, since the tritium derives from tritiated water, the steroid starting materials are readily available, and high yields are obtained in all steps.

ChromatographyTritiated waterChemistrymedicine.medical_treatmentOrganic ChemistryRadiochemistryBiochemistryAnalytical ChemistrySteroidPart iiichemistry.chemical_compoundDrug DiscoverymedicineRadiology Nuclear Medicine and imagingTritiumSpectroscopyJournal of Labelled Compounds and Radiopharmaceuticals

Two-particle correlations in 400 GeV proton-nucleus interactions

1980

Two-particle inclusive correlations are studied by means of the two-particle rapidity correlation function. The data for the analysis come from an exposure of emulsion plates to a 400 GeV proton beam at FNAL. Predominant short-range correlations among shower particles are found, but this does not allow to exclude some long-range correlation behaviour, in agreement with the results obtained in lower-energy experiments.

PhysicsNuclear physicsParticle physicsCorrelation function (statistical mechanics)medicine.anatomical_structureProtonPhysics::Instrumentation and DetectorsmedicineParticleRapidityNucleusBeam (structure)Il Nuovo Cimento A

Extraction of objects from structured backgrounds in the cat superior colliculus. Part II

1980

Specific changes occur in the cells of the uppers layers of the cat's superior colliculus when a two dimensional noise (background) is superimposed onto a deterministic signal (spot of light). Some of the measurements can be interpreted as meaning that some cells only react to certain relative movements of object (spot) and background (noise). The movement of the visual background is interpreted as environmental movement occurring due to the animal's own movement. The results of the measurements provide all the necessary presuppositions for a distinction between the animal's own velocity and that of the object (Part I). The experimental results can be interpreted with a model. The essential…

Superior ColliculiGeneral Computer ScienceModels NeurologicalMotion PerceptionNeural ConductionObject (grammar)SignalDistortionAnimalsComputer visionPhysicsMovement (music)business.industrySuperior colliculusNeural InhibitionPattern recognitionDendritesForm PerceptionNoiseCoupling (computer programming)Space PerceptionPattern recognition (psychology)CatsArtificial intelligencebusinessBiotechnologyBiological Cybernetics

Electrophysiological evidence for circadian rhythmicity in a mammalian pineal organ

1980

Long-term electrophysiological recordings from the guinea-pig pineal organ show that three types of intrinsic cells can be distinguished: (i) Cells showing constant firing rates over periods of up to 24 hours. (ii) Cells which are highly active during the day and show a low firing rate during the night. (iii) Cells which exhibit low activity during the day and enhanced activity during the night; these cells can be strongly inhibited by 1 min of light given during the night. Both the light- and darkness-activated cells show activity patterns which closely follow season-dependent differences in day- and night-lengths. In addition, both cell types show an oscillatory pattern in maintained acti…

MaleNeuronsmedicine.medical_specialtyCell typeLightGuinea PigsLow activityDarknessBiologyPineal GlandCircadian RhythmPsychiatry and Mental healthElectrophysiologyPineal glandEndocrinologymedicine.anatomical_structureNeurologyInternal medicineDarknessmedicineAnimalsNeurology (clinical)Circadian rhythmPineal organBiological PsychiatryJournal of Neural Transmission

Marché de l'enseignement supérieur et marché de l'emploi en France

1980

International audience

Marché de l'emploi[SHS.EDU]Humanities and Social Sciences/Education[SHS.EDU] Humanities and Social Sciences/EducationFranceEnseignementMarché de l'éducationComputingMilieux_MISCELLANEOUSEnseignement supérieur

Canonical Neutral Current Predictions From The Weak Electromagnetic Gauge Group SU(3) X U(1)

1980

A straightforward SU(3) x U(1) model in which there is effectively one new neutral-current parameter (denoted by R) is shown to give the canonical neutrino neutral-current predictions for all values of R. For small R the ''low-energy'' theory is essentially SU(2) x U(1) while for R of the order of one it has a much richer ''low-energy'' gauge-boson mass spectrum. Even in the latter case, the predicted e-d asymmetry agrees with experiment. It is interesting that the atomic-physics parity violation depends sensitively on R.

PhysicsCoupling constantParticle physicsNeutral currentmedia_common.quotation_subjectFísicaElementary particleParity (physics)AsymmetryGauge groupGauge theorymedia_commonMathematical physicsLepton

Morphological investigation of the deep pineal of the rat.

1980

The results presented here reveal that in adult Sprague-Dawley and Wistar rats the pineal gland represents a complex rather than a single organ. Regularly one can distinguish (i) pineal tissue in the intercommissural region as a deep pineal, (ii) a superficial pineal, which represents the major part of the pineal complex, and (iii) nearly always a parenchymal stalk of variable length. The volume of the deep pineal with the adjacent parenchymal stalk exhibits great interindividual variation. It amounts to 127 +/- 39 X 10(5) mum3 (mean +/- standard deviation). The histological appearance of the deep and superficial pineal tissue is fairly similar. The intrinsic cells of the deep and superfici…

Maleendocrine systemPathologymedicine.medical_specialtyCytoplasmHistologyTime FactorsKaryometryStatistics as TopicBiologyPineal GlandPathology and Forensic MedicineKaryometryPineal glandParenchymamedicineAnimalsCell NucleusMean valueCell BiologyAnatomyVariable lengthRatsmedicine.anatomical_structurenervous systemFemalehormones hormone substitutes and hormone antagonistsCell and tissue research

Conversion of the Ca2+-ATPase from Rhodospirillum rubrum into a Mg2+-dependent enzyme by 1,N6-etheno ATP

1980

Nucleoside triphosphate hydrolysis of R.rubrum ATPase complexes can be changed from Ca2+-dependence to Mg2+-dependence by replacing ATP with 1,N6-etheno ATP. Four ATPase complexes which have been prepared by different procedures hydrolyze ATP and 1,N6-etheno ATP at different rates in dependence on the added metal ions. These differences allow an easy distinction of the various enzyme forms.

ATPaseBiophysicsPhotophosphorylationCalcium-Transporting ATPasesRhodospirillum rubrumBiochemistrychemistry.chemical_compoundAdenosine TriphosphateMagnesiumMolecular BiologyEdetic Acidchemistry.chemical_classificationbiologyATP synthaseChemiosmosisCell MembraneRhodospirillum rubrumCell Biologybiology.organism_classificationKineticsEnzymeBiochemistrychemistrybiology.proteinNucleoside triphosphateOligomycinsATP synthase alpha/beta subunitsEthenoadenosine TriphosphateProtein BindingBiochemical and Biophysical Research Communications

Azapropazone binding to human serum albumin

1980

Azapropazone, a new non-steroidal antiinflammatory drug, is strongly bound to human serum albumin. As revealed by Scatchard analysis, one high-affinity binding site with an association constant of about 1.2 x 10(6)M-1 and two low-affinity binding sites with association constants of about 0.05 x 10(6)M-1 were found. While the high-affinity binding site of azapropazone is clearly not identical with the diazepam or digitoxin binding sites of human serum albumin, contradictory evidence was found by optical measurements and displacement studies for the similarity of the azapropazone and the warfarin binding site of human serum albumin. At present, it is suggested that both drugs bind to differen…

ApazoneDigitoxinOptical measurementsEndogenyPlasma protein bindingIn Vitro TechniquesPharmacologyBinding CompetitivemedicineHumansBinding siteSerum AlbuminAzapropazonePharmacologyBinding SitesAntiinflammatory drugTriazinesChemistryCircular DichroismGeneral MedicineHuman serum albuminPhenylbutazoneBiochemistryDialysisProtein Bindingmedicine.drugNaunyn-Schmiedeberg's Archives of Pharmacology