showing 36 of ~574560 from 574555 documents

Finlance : the Finnish journal of language learning and language teaching 1981, Vol. I

1981

OBJECTIVES AND SYLLABUS DESIGN Kohonen, Viljo: On instructional design in LSP, pp. 1-37 Kurki-Suonio, Liisa: Syllabus design in LSP — a case study, pp. 39-51 Berggren, Ola: Kielikoulutus teollisuusyrityksessä, pp. 53-72 TEACHING — THEORY AND PRACTICE Price, Janet: A case for courage, pp.73- 80 Tommola, Jorma: Psycholinguistic approaches to reading, pp. 81-99 Korpimies, Liisa: Discourse analysis and the teaching of LSP, pp.101-128 Greenall, Gerry: Some pre-text reading improvement — exercises for overseas students in the UK, pp. 129-136 TESTING Takala, Sauli: Normimittaaminen ja kriteerimittaaminen: eroja ja yhtäläisyyksiä, pp. 137-159 Konttinen, Raimo: Kielikokeista, 161-167 Lindblad, Tors…

kieli ja kieletkielitiedekieltenopetusopetuskielen oppiminen

Michele Amari, Diari e appunti autobiografici inediti

1981

Il volume pubblica i diari inediti dello storico siciliano autore della Guerra del Vespro

Settore M-STO/02 - Storia ModernaSicilia Ottocento storia politica storiografia

Dynamics at the Temperature Crossover in Dilute Polymer Solutions Investigated by Neutron Spin-Echo Spectroscopy

1980

Applying ultrahigh-resolution neutron spin-echo spectroscopy the existence of a $q$-dependent temperature crossover in the dynamics of dilute polymer solutions was proved. It is associated with the transition from $\ensuremath{\theta}$ to good solvent conditions. At small momentum transfers $q$ a nearly stepwise increase of the reduced quasielastic linewidth versus the reduced temperature was observed. With increasing $q$, both the sharpness of the transition and the step height decrease.

Momentumchemistry.chemical_classificationLaser linewidthMaterials scienceReduced propertieschemistryCondensed matter physicsCrossoverGeneral Physics and AstronomyNeutronPolymerSpectroscopyNeutron spin echoPhysical Review Letters

Evidence for essential primary amino groups in a bacterial coupling factor F1ATPase.

1980

Abstract We have found that the binding of pyridoxal-5′-phosphate to 6 primary amino groups leads to the inactivation of the enzyme. A preferential reaction of pyridoxal-5′-phosphate with the α-subunits of this enzyme can be demonstrated. The reactivity of the amino groups is influenced by various effectors. In the presence of ATP the inhibition of the ATPase activity is noncompetitive.

chemistry.chemical_classificationAdenosine TriphosphatasesPrimary (chemistry)Binding SitesChemistryStereochemistryEffectorCell MembraneBiophysicsCell BiologyBiochemistryMicrococcusCoupling (electronics)Structure-Activity RelationshipEnzymeBiochemistrySolubilityPyridoxal PhosphateAtpase activityReactivity (chemistry)Amino AcidsMolecular BiologyBiochemical and biophysical research communications

The teaching production in french institutions of higher education

1980

International audience

[SHS.EDU]Humanities and Social Sciences/Educationhigher education[SHS.EDU] Humanities and Social Sciences/Education[ SHS.EDU ] Humanities and Social Sciences/EducationFranceComputingMilieux_MISCELLANEOUSteaching production

Effects of an Earth-strength magnetic field on electrical activity of pineal cells

1980

Although magnetic fields can influence biological systems, including those of man and other vertebrates1–5, no central nervous structure has been identified that might be involved in their detection. From a theoretical point of view, the pineal organ might be such a structure for the following reasons: (1) It is involved in the regulation of circadian rhythms6 and is thus essential for migratory restlessness (‘Zugunruhe’)7. Orientation at that time can be altered by an artificial magnetic field (MF) with a direction differing by 90° from that of the Earth. Circadian rhythms can be inhibited from phase shifting by compensation of the Earth's MF and can be influenced by an artificial MF8. (2)…

Malemedicine.medical_specialtyMultidisciplinaryGuinea PigsAction PotentialsBrainBiologyPineal GlandMagnetic fieldMagneticsZugunruheElectrophysiologyEndocrinologyInternal medicinemedicineBiophysicsAnimalsPineal organCircadian rhythmNature

Search for Superheavy Elements in theU238+U238Reaction

1980

A search was made for spontaneously fissioning superheavy elements in damped collisions of two uranium nuclei. Different techniques were applied covering the elements 108 to 118 and approx. =126, and a half-life range from 1 ms to more than 1 yr. No evidence for superheavy elements was found at upper cross-section limits of 10/sup -32/, 10/sup -33/, and 10/sup -35/ cm/sup 2/ for half-lives from 1 to 100 ms, 100 ms to 1 d, and 1 d to 1 yr, respectively.

Nuclear physicsPhysicsNuclear reactionchemistryFissionQ valueGeneral Physics and Astronomychemistry.chemical_elementSuperheavy ElementsUraniumSpontaneous fissionPhysical Review Letters

false

1980

Molecular weights of Trogamid T® were determined by ultracentrifugation, light-scattering, osmometry and viscometry, molecular weight distributions by gel permeation chromatography (GPC) and five different fractionation methods. The separation efficiency of GPC with N,N-dimethylformamide as solvent was tested with three different types of gels, crosslinked polystyrene, porous glass and crosslinked poly(vinyl acetate), the last one yielding the best results. Solution fractionations show better results than precipitation methods. All fractionations gave far too small apparent non-uniformities. After correction according to the non-uniformities of the fractions the results corresponded to thos…

SolventGel permeation chromatographychemistry.chemical_compoundChromatographychemistryMolecular massOsmometerPolymer chemistryVinyl acetatePolystyreneFractionationPorous glassDie Makromolekulare Chemie

Influence of aging on the mechanical behavior of leg extensor muscles.

1980

Age dependence of the mechanical behavior of leg extensor muscle was investigated using vertical jumps with and without a stretch-shortening cycle on the force-platform. A total 226 subjects (113 females and 113 males) ranging in age from 4--73 years were examined. The results indicated in general that performance in males was better than that in females. This difference was reduced when body weight was taken into consideration. The peak performance of the various parameters, such as average force, height of rise of center of gravity, net impulse, and also the average power output, was reached in both sexes between the ages of 20 and 30 years. For example, the average vertical force in squa…

AdultMaleAgingAdolescentPhysiologyConcentricBiologyBody weightStretch shortening cycleSex FactorsPhysiology (medical)medicineHumansOrthopedics and Sports MedicinePower outputChildAgedOrthodonticsMusclesPublic Health Environmental and Occupational HealthGeneral MedicineAnatomyMiddle AgedElasticityVertical forceChild PreschoolReflexSquatting positionFemalemedicine.symptomMathematicsMuscle contractionMuscle ContractionEuropean journal of applied physiology and occupational physiology

HIGH SPIN STATES OF 232Th, 234U AND 236U+

1980

PhysicsSpin statesCondensed matter physicsGeneral EngineeringLe Journal de Physique Colloques

Numerische Lösung gewöhnlicher Differentialgleichungen mit Splinefunktionen

1980

In dieser Arbeit wird ein allgemeines Verfahren zur Erzeugung von Splineapproximationen fur die Losungen von Anfangswertproblemen bei gewohnlichen Differentialgleichungen vorgestellt. Einige der bekannten Spline-approximationsmethoden sind als Spezialfalle enthalten. Eine gangige Vorgehensweise besteht darin, das Intervall, uber dem das Anfangswertproblem gegeben ist, in aquidistante Teilintervalle zu zerlegen und dann sukzessive die Splineapproximation zu definieren. Hierbei wird gefordert, das die Spline-approximation in den Knoten gewisse Bedingungen erfullt. Bei dem hier betrachteten allgemeinen Verfahren werden in den einzelnen Teilintervallen noch zusatzliche Zwischenknoten eingefuhrt…

Computational MathematicsNumerical AnalysisComputational Theory and MathematicsPhilosophyHumanitiesComputer communication networksSoftwareComputer Science ApplicationsTheoretical Computer ScienceComputing

Multi-step metabolic activation of benzene. Effect of superoxide dismutase on covalent binding to microsomal macromolecules, and identification of gl…

1980

Abstract Incubation of [ 14 C]benzene or [ 14 C]phenol with liver microsomes from untreated rats, in the presence of a NADPH-generating system, gave rise to irreversible binding of metabolites to microsomal macromolecules. For both substrates this binding was inhibited by more than 50% by addition of superoxide dismutase to the incubation mixtures. The decrease in binding was compensated for by accumulation of [ 14 C]hydroquinone, indicating superoxide-mediated oxidation of hydroquinone as one step in the activation of benzene to metabolites binding to microsomal macromolecules. Since our previous work had shown that binding occurred mainly with protein rather than ribonucleic acid and was …

MaleMacromolecular SubstancesMetaboliteIn Vitro TechniquesToxicologyMass SpectrometryAdductchemistry.chemical_compoundPhenolsAnimalsPhenolBenzeneBiotransformationChromatography High Pressure LiquidCatecholChromatographyHydroquinoneSuperoxide DismutaseChemistryBenzeneGeneral MedicineGlutathioneGlutathioneBenzoquinoneRatsMicrosomes LiverChemico-Biological Interactions

De l'inefficacité du système français d'enseignement supérieur

1980

Rapport commandité par le CNRS; International audience

Efficacité de l'enseignement[SHS.EDU]Humanities and Social Sciences/Education[SHS.EDU] Humanities and Social Sciences/EducationFranceSystème éducatifEnseignement supérieur

Quelques problèmes posés par les mesures de performance dans les universités

1980

International audience

UniversitéÉtablissement d'enseignement[SHS.EDU]Humanities and Social Sciences/Education[SHS.EDU] Humanities and Social Sciences/EducationÉvaluation des performancesFranceComputingMilieux_MISCELLANEOUSEnseignement supérieur

The Influence of Insulin on Local Amyloidosis of the Islets of Langerhans and Insulinoma

1980

Summary Amyloid-containing islets of Langerhans from the pancreas of 75 diabetics and one case of an amyloid-containing insulinoma were investigated. By light and electron microscopy, amyloid deposits were observed between the B cells and adjacent capillaries. The cytoplasm of B cells and extracellular amyloid display immunohistological binding of anti-insulin antibody. Correspondingly, ferritin-labeled anti-insulin antibody was found by electron microscopy on and between the amyloid fibrils. Insulin or proinsulin (or a protein closely related to insulin) thus appears to be a.component of the protein which constitutes the amyloid. The molecular weight and mode of deposition of this form of …

AdultMalemedicine.medical_specialtyAmyloidmedicine.medical_treatmentPathology and Forensic MedicineIslets of LangerhansInsulin-Secreting CellsInternal medicinemental disordersExtracellularmedicineHumansHypoglycemic AgentsInsulinInsulinomaAgedProinsulinAged 80 and overbiologyChemistryInsulinAmyloidosisAmyloidosisCell BiologyMiddle Agedmedicine.diseaseImmunohistochemistryPancreatic NeoplasmsMicroscopy Electronmedicine.anatomical_structureEndocrinologyDiabetes Mellitus Type 2biology.proteinFemaleInsulinomaAntibodyPancreasPathology - Research and Practice

Herpes-Simplex-virus-specific, H-2Dk-restricted T lymphocytes bear receptors for H-2Dd alloantigen.

1980

Cytotoxic T lymphocytes generated in the course of an HSV-infection of CBA (H-2k) mice not only lyse syngeneic, virus-infected target cells but also cross-react with noninfected taraget cells expressing the Dd alloantigen. On the effector cell level, this alloreactivity is mediated by virus-specific CTL's that are restricted to H-2Dk determinants. On the prekiller cell level, the anti-HSV-reactive T cells exhibiting cross-reactivity for Dd alloantigen could be positively selected on H-2d spleen-cell monolayers. After differentiation into cytolytic effector cells, target cells expressing Dd alloantigens and syngeneic HSV-infected target were lysed with equal efficiency. The results imply tha…

Cytotoxicity ImmunologicT-LymphocytesImmunologyReceptors Antigen T-Cellchemical and pharmacologic phenomenaMice Inbred StrainsBiologymedicine.disease_causeVirusEpitopesMiceGeneticsmedicineCytotoxic T cellAnimalsSimplexvirusReceptorEffectorH-2 Antigenshemic and immune systemsbiology.organism_classificationMolecular biologyCytolysisCTL*RickettsiaHerpes simplex virusImmunologyImmunogenetics

ON THE ONE-DIMENSIONAL SCHRÖDINGER EQUATION WITH A QUASI-PERIODIC POTENTIAL

1980

Solution of Schrödinger equation for a step potentialPhysicssymbols.namesakeHistory and Philosophy of ScienceBreatherGeneral NeurosciencesymbolsQuasi periodicNonlinear Schrödinger equationGeneral Biochemistry Genetics and Molecular BiologySchrödinger fieldMathematical physicsSchrödinger equationAnnals of the New York Academy of Sciences

Myxoid lipoadenorna of the parathyroid gland

1980

A myxoid lipoadenoma of the parathyroid gland causing primary hyperparathyroidism is reported. The very rare and histologically unusual tumor consists of an epithelial component which is combined with a stromal component in a characteristic way. Slender, irregularly branched trabeculae which mainly consist of chief cells as well as a few oxyphil cells are found as epithelial component. The predominantly myxomatous and only focally lipomatous stromal component is interpreted as an integrated tumor component of the lipoadenoma which is derived from the parathyroid adipose tissue.

AdenomaMaleHyperparathyroidismmedicine.medical_specialtyPathologyStromal cellAdenomaParathyroid neoplasmHyperparathyroidismAdipose tissueCell BiologyMiddle AgedBiologymedicine.diseasePathology and Forensic MedicineParathyroid Neoplasmsmedicine.anatomical_structureLipoadenomaEndocrinologyInternal medicinemedicineHumansParathyroid glandPrimary hyperparathyroidismPathology - Research and Practice

�ber Frattiniduale in endlichen Gruppen

1980

General MathematicsHumanitiesMathematicsArchiv der Mathematik

Morphology of melt-crystallized linear polyethylene fractions and its dependence on molecular weight and crystallization temperature

1980

Replicas and thin-section electron microscopic studies were made of fractions of linear polyethylene covering the molecular weight range 2.78 × 104 to 6.0 × 106 for a variety of crystallizing conditions. Lamellar crystallites were found under all circumstances; and the supermolecular structure, or crystalline morphology, is in agreement with that previously reported from an analysis of the small-angle light-scattering patterns of the same samples under similar crystallization conditions. Details of the crystalline microstructure are also described, which range from truncated hollow pyramids which degenerate as the molecular weight or the undercooling are increased. From these results, it is…

Morphology (linguistics)Materials scienceGeneral EngineeringPolyethyleneMicrostructurelaw.inventionLinear low-density polyethylenechemistry.chemical_compoundCrystallographychemistrylawLamellar structureCrystalliteCrystallizationSupercoolingJournal of Polymer Science: Polymer Physics Edition

Lokal endlich-aufl�sbare Produkte von zwei hyperzentralen Gruppen

1980

General MathematicsHumanitiesMathematicsArchiv der Mathematik

Grades of atypia in tubular and villous adenomas of the human colon. An electron microscopic study.

1980

Of a total of 544 tubular, villous and tubulo-villous adenomas of the human colon which were investigated by light microscopy, six tubular and six villous adenomas were examined under the electron microscope. It was shown that the two types of adenoma differ in their tissue architecture, but not in their cytological appearance. Different grades of epithelial atypia occur in both types of adenoma. These are designated as grades I to III, correspond to mild, moderate and severe atypia respectively. Whereas adenoma cells with atypia grade I clearly show a cytological relationship with crypt epithelia of the normal colonic mucosa under the electron microscope, adenoma cells with atypia grade II…

Adenomamedicine.medical_specialtyPathologyendocrine system diseasesAdenomaCellular differentiationCryptBiologyGastroenterologyMalignant transformationlaw.inventionlawInternal medicinemedicineAtypiaHumansElectron microscopicCell Differentiationmedicine.diseasedigestive system diseasesstomatognathic diseasesMicroscopy ElectronColonic NeoplasmsElectron microscopeHuman colonGlycogenVirchows Archiv. B, Cell pathology including molecular pathology

Blocking sets and partial spreads in finite projective spaces

1980

A t-blocking set in the finite projective space PG(d, q) with d≥t+1 is a set $$\mathfrak{B}$$ of points such that any (d−t)-dimensional subspace is incident with a point of $$\mathfrak{B}$$ and no t-dimensional subspace is contained in $$\mathfrak{B}$$ . It is shown that | $$\mathfrak{B}$$ |≥q t +...+1+q t−1√q and the examples of minimal cardinality are characterized. Using this result it is possible to prove upper and lower bounds for the cardinality of partial t-spreads in PG(d, q). Finally, examples of blocking sets and maximal partial spreads are given.

CombinatoricsDiscrete mathematicsCardinalityDifferential geometryHyperbolic geometryProjective spaceGeometry and TopologyAlgebraic geometryUpper and lower boundsSubspace topologyMathematicsProjective geometryGeometriae Dedicata

The fragmentation of 5- and 3-substituted thiophene-2-carboxamides under electron impact

1980

The 70 eV electron impact mass spectra of twelve 5- and 3-substituted thiophene-2-carboxamides are discussed with the aid of exact mass measurements and labelling experiments. All mass spectra exhibit pronounced molecular ions. Some isomeric 5- and 3-substituted title compounds can be differentiated by mass spectrometry. The fragmentation is influenced by a strong ‘ortho-effect’ which activates the NH3 elimination. In the other cases the most important fragmentation is NH2˙ loss, followed by CO elimination.

Collision-induced dissociationAnalytical chemistryPhotochemistryMass spectrometryBiochemistryIonMasschemistry.chemical_compoundchemistryFragmentation (mass spectrometry)Mass spectrumThiopheneMolecular MedicineInstrumentationSpectroscopyElectron ionizationOrganic Mass Spectrometry

�ber Vertauschbarkeit, normale Einbettung und Dominanz bei Fittingklassen endlicher aufl�sbarer Gruppen

1980

General MathematicsHumanitiesMathematicsArchiv der Mathematik

Le déclin des taux de rendement de l'enseignement supérieur : échos d'une controverse nord-américaine

1980

Taux de rendement[SHS.EDU]Humanities and Social Sciences/Education[SHS.EDU] Humanities and Social Sciences/EducationÉvolutionRendement de l'enseignementEnseignement supérieur

Periodic and Nil Polynomials in Rings

1980

Let R be an associative ring and f(x1,…, xd) a polynomial in noncommuting variables. We say that f is periodic or nil in R if for all r1,…, rd ∈ R we have that f(r1,…, rd) is periodic, respectively nilpotent (recall that a ∈ R is periodic if for some integer ).

CombinatoricsNilpotentRing (mathematics)PolynomialIntegerGeneral Mathematics010102 general mathematics0101 mathematics01 natural sciencesAssociative propertyMathematicsCanadian Mathematical Bulletin

Über die Verbreitung von Flavonoiden bei pleurokarpen Laubmoosen II. Apigenin and Apigenin-7-rhamnoglucosid bei Pleurozium schreberi (Willd.) Mitt.

1980

Summary 12 species of pleurocarpous mosses have been investigated as to their content of flavonoids. Flavonoid tests on 11 species have given negative results. Only one species, Pleurozium schreberi , contains three flavonoids. They were purified by means of paper chromatography. Two of them are by chromatography, acid hydrolysis and absorption spectrum identical with apigenin and apigenin-7-rhamnoglucoside. The third flavonoid is as yet unidentified. Qualitative hydrolysis yields apigenin. The chemotaxonomic importance of the results is briefly discussed.

chemistry.chemical_classificationChromatographybiologyfungiFlavonoidfood and beveragesGeneral Medicinebiology.organism_classificationcarbohydrates (lipids)Paper chromatographyHydrolysischemistry.chemical_compoundchemistryApigeninheterocyclic compoundsAcid hydrolysisPleurozium schreberiZeitschrift für Pflanzenphysiologie

Kinetic studies on the elimination of different substituted phenols by goldfish (Carassius auratus)

1980

chemistry.chemical_compoundChemistryHealth Toxicology and MutagenesisEnvironmental chemistryCarassius auratusEcotoxicologyGeneral MedicinePhenolsToxicologyPollutionBulletin of Environmental Contamination and Toxicology

Endliche nichtkommutative Gruppen mit PartitionII und fixpunktfreiemII-Automorphismus

1980

General MathematicsHumanitiesMathematicsArchiv der Mathematik

Liver diseases and hepatitis B virus antigens and antibodies in chronic HBsAg carriers in childhood

1980

Liver biopsies were obtained from 109 children who had been chronic carriers of HBsAg for more than 6 months. The specimens were examined for the presen Ice of intracellular HBsAg, HBcAg and HBeAg by direct immunofluorescence. Sera were tested for HBeAg, virus B specific DNA polymerase, anti-HBs, anti-HBe and anti-HBc. On the basis of accepted histological criteria we found chronic active hepatitis (CAH) in 56 and chronic persistent hepatitis (CPH) in 19 children. 15 cases had minimal changes (minimal hepatitis, MH) and 19 normal liver tissue (healthy HBsAg carriers, HC). Children with CAH and CPH had HBeAg, DNA polymerase and anti-HBc in their serum. HBcAg and HBeAg were found in 5-50% of …

HepatitisHepatitis B virusHBsAgbiologybusiness.industryvirusesLiver cellvirus diseasesmedicine.diseasemedicine.disease_causeVirologydigestive system diseasesVirusHBcAgHBeAgPediatrics Perinatology and Child HealthImmunologybiology.proteinMedicineAntibodybusinessPediatric Research

Acid proteolytic capacity in mouse cardiac and skeletal muscles after prolonged submaximal exercise

1980

Acid proteolytic capacity in mouse cardiac muscle and in predominantly white (distal head of m. vastus lateralis) or predominantly red (proximal red heads of m. vastus lateralis, m. v. medialis, and m. v. intermedius) skeletal muscle was estimated 5 days after 3 h, 6 h or 9 h prolonged running at a speed of 13.5 m/min. The activities of acid protease and beta-glucuronidase together with the rate of acid autolysis considerably increased in both skeletal muscle types, especially in red muscle, but did not increase in cardiac muscle. Acid proteolytic capacity and beta-glucuronidase activity increased in relation to the duration of running. Protein content and oxidative capacity (the activities…

Malemedicine.medical_specialtyAutolysis (biology)Time FactorsPhysiologyPhysical ExertionClinical BiochemistryIschemiaProtein metabolismMuscle ProteinsCitrate (si)-SynthaseCathepsin DMalate dehydrogenaseMicechemistry.chemical_compoundMalate DehydrogenasePhysiology (medical)Internal medicinemedicineAnimalsCitrate synthaseExertionGlucuronidasebiologyMusclesMyocardiumCardiac muscleSkeletal muscleAnatomymedicine.diseaseCathepsinsEndocrinologymedicine.anatomical_structurechemistrybiology.proteinPfl�gers Archiv European Journal of Physiology

Fine structure of sensilla during moulting inNeomysis integer (Leach) (Crustacea, Mysidacea)

1980

During the moulting cycle the sensory cells and the newly formed hair shaft remain connected to the old cuticular receptive apparatus of the sensillum by the elongated outer segments of the dendrites, which run through the exuvial space. A surface coat covering the outer dendritic segments protects them against the chemical influences of the exuvial fluid. The findings suggest that the receptors remain functional until ecdysis. This moulting type is considered to be a transitional form between the moulting types so far known.

Pharmacologyintegumentary systemHair shaftMysidaceaCell BiologyAnatomyBiologybiology.organism_classificationSensory cellCrustaceanCell biologyCellular and Molecular NeuroscienceEcdysisMolecular MedicineMolecular BiologyMoultingSensillumExperientia

A Dichoptic Edge Effect Resulting from Binocular Contour Dominance

1980

If one eye sees a bright field on a dark surround while a homogeneous background is presented to the other eye, then a distinct dark zone appears at the outer borders of the field.If the surround is coloured, then the zone is of corresponding hue. The effect disappears if the edge of the field can be fused with a bar of appropriate contrast. The influence of parameters such as pattern contrast and size were studied quantitatively. A model is proposed relating the effect to receptive-field organisation and the fusion process.

LightField (physics)Bar (music)media_common.quotation_subjectModels NeurologicalColorField Dependence-IndependenceExperimental and Cognitive PsychologyFixation OcularEdge (geometry)Retina050105 experimental psychology03 medical and health sciences0302 clinical medicineOpticsArtificial IntelligenceDark zoneHumansContrast (vision)0501 psychology and cognitive sciencesVision OcularHuemedia_commonNeuronsPhysicsbusiness.industry05 social sciencesSensory SystemsOphthalmologyDominance (ethology)HomogeneousSensory Thresholdsbusiness030217 neurology & neurosurgery

Morphogenesis of mechanoreceptor and epidermal cells of crickets during the last instar, and its relation to molting-hormone level.

1980

(1) The fine structure of the cercal campaniform sensilla and epidermal cells of Gryllus bimaculatus Deg. (Saltatoria, Gryllidae) was examined, and the ecdysteroid level was monitored throughout the last larval instar. (2) The epidermal cells show changes in shape, cytoplasmic inclusions and differentiation of the apical cell membrane, coupled to the phases of buildup and breakdown of the (cercus) cuticle. (3) The imaginal epicuticle of the epidermal cells begins to form later (by about approximately 6h) than that of the campaniform sensilla. (4) The campaniform sensilla were studied with respect to (a) the morphogenesis of the cuticular apparatus, (b) the inclusion of phenol oxidases in th…

MaleEcdysoneanimal structuresHistologyCuticleCampaniform sensillaApolysisMolting cyclePathology and Forensic Medicinechemistry.chemical_compoundAnimalsEcdysteroidintegumentary systembiologyGryllus bimaculatusfungiMetamorphosis BiologicalCell BiologyAnatomybiology.organism_classificationCell biologychemistryEpidermal CellsEcdysisLarvaOrthopteraFemaleMechanoreceptorsEcdysoneCell and tissue research

Novel porous carbon packings in reversed-phase high-performance liquid chromatography

1980

Abstract Porous carbon packings of particle size 5–20 μm were prepared by calcination of purified active carbons and cokes having narrow size ranges. Highly efficient columns packed with 10-μm particles were obtained by means of the high-viscosity slurry technique, and exhibited about 3000 theoretical plates at 100 mm length and optimal eluent flow-rate. The loading of columns, θ0.1, was determined to be 25–50 μg of solute per gram of packing. Eluotropic series of solvents were found to be similar to those on pyrocarbon-modified carbons and silicas. The log k′ values for homologous compounds increased linearly with the hydrocarbonaceous surface area at constant eluent composition. Studies w…

Aqueous solutionChromatographyOrganic ChemistryAnalytical chemistrychemistry.chemical_elementGeneral MedicineBiochemistryAnalytical Chemistrylaw.inventionColumn chromatographychemistrylawPolarizabilityPhase (matter)CalcinationParticle sizeTheoretical plateCarbonJournal of Chromatography A