Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Insect antifeedants: a behavioural and electrophysiological investigation of natural and synthetically derived clerodane diterpenoids (1988)
    Springer
    Entomologia experimentalis et applicata 46 (1988), S. 267-274 
    Details
    ISSN: 1570-7458
    Keywords: Antifeedants ; clerodanes ; ajugarin ; Spodoptera larvae ; Heliothis larvae ; behaviour — electrophysiology correlation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Une gamme de diterpénoïdes clérodanes, certains naturels, d'autres dérivés par synthèse de produits naturels ou enfin totalement synthétiques, ont été essayés pour leurs effets phagodissuadants contre des espèces de Spodoptera et Heliothis, par examens comportementaux, par observations directes et électrophysiologie des récepteurs du goût. L'examen de la structure moléculaire en relation avec les résultats de ces observations produit une information valable sur les caractéristiques des molécules impliquées dans l'action phagodissuadante. Les fractions époxy et diacétate de l'anneau décalin contribuent toutes deux à l'efficacité de la molécule, et leur configuration influe sur l'ampleur de l'action. Le côté furofuran de la chaîne à C9 est une part essentielle de la molécule et sa composition est liée à son activité. Les réponses comportementales se combinent bien à l'activité d'un neurone dissuadant unique dans la sensille styloconique médiane de S. exempta. Chez S. littoralis et S. frugiperda, le code neural d'évaluation de la valeur alimentaire est plus complexe. Chez ces espèces, la corrélation du comportement et de l'électrophysiologie produit de l'information sur l'importance relative de la contribution des différents neurones au code sensoriel. Les relations entre structure et activité révélées au cours de cette étude ont été examinées en relation avec les mécanismes de réception envisageables dans les neurones impliqués. S. exempta, oligophage, est plus sensible aux effets antidissuadants de ces composés qu'aucune des espèces polyphages.
    Notes: Abstract Natural and synthetic clerodane diterpenoids were assayed behaviourally and electrophysiologically as antifeedants against larvae of Spodoptera exempta (Walker), S. littoralis (Boisduval), S. frugiperda (J. E. Smith), Heliothis armigera (Hübner) and H. virescens (F.). The constitution of the decalin ring and the furofuran side chain were found to have an important antifeedant effect. A correlation of behavioural and electrophysiological responses of the species of Spodoptera revealed aspects of their neural codes and provided some insight into the receptor mechanisms that may operate in individual neurones. The oligophagous S. exempta was more susceptible than the polyphagous species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00364198
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Cellular and secreted tumor plasminogen activator: The effects of NaCl (1986)
    Springer
    Cellular and molecular life sciences 42 (1986), S. 433-435 
    Details
    ISSN: 1420-9071
    Keywords: Plasminogen activator ; NaCl ; metastasis ; MAT 13762 cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Plasminogen activator, secreted by metastatic tumor cells, was strongly inhibited in buffer or tissue culture medium containing physiological concentrations of NaCl. Intact cells, however, expressed strong activity under similar conditions. Thus, if plasminogen activator is involved in invasion and metastasis, the cellular activity, acting as an ectoenzyme, may be more important than secreted enzyme under physiological conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02118645
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Thermal degradation of polymers. Part III. Vacuum pyrolysis of poly(m-aminostyrene); the products volatile at pyrolysis temperature which are liquid or gaseous at room temperaturePaper presented at Thermal Analysis Group of Society of Analytical Chemistry Burlington House, London, on November 13th, 1968. (1969)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 13 (1969), S. 2033-2043 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The products obtained on degradation of poly(m-aminostyrene) in vacuo are described. The effect of molecular weight and pyrolysis temperature are discussed and the behavior of poly(m-aminostyrene) compared with that of polystyrene. Quantitative analytical methods using ultra-violet spectroscopy and gas liquid chromatography are described for m-aminostyrene and m-toluidine. The possible mechanisms of degradation to yield the products are discussed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1969.070131001
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    A positron annihilation lifetime study of isothermal structural relaxation in bisphenol-A polycarbonate (1988)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 26 (1988), S. 1541-1552 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Positron annihilation lifetime spectroscopy has been used to study the isothermal relaxation response of compression molded bisphenol-A polycarbonate at temperatures of 263, 273, and 303 K. The temperature dependence of both the lifetime and intensity of the ortho-Positronium (o-Ps) pickoff component is discussed in terms of ductile-to-brittle transition behavior and free volume theory. An additive exponential model and the Williams-Watt model were used to analyze the relaxation as a function of temperature and provided results consistent with the anticipated molecular mobility of polycarbonate at sub-Tg temperatures.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1988.080260605
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Structure of the deoxytetranucleotide d-pApTpApT and a sequence-dependent model for poly(dA-dT)Supplementary material on observed and calculated structure factors for d-pApTpApT is available from the authors. (1982)
    New York : Wiley-Blackwell
    Biopolymers 21 (1982), S. 513-533 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The x-ray structure of the hydrated ammonium salt of the deoxytetranucleotide d-pApTpApT was determined by Patterson and direct methods at a resolution of 1 Å. The crystal structure contains right-handed double-helical segments formed by complementary Watson-Crick-type hydrogen bonding between the adenine and thymine bases of neighboring molecules. The minihelix contains two base pairs. The chains are antiparallel. The A-T and T-A sequences have different phosphodiester conformations. The deoxyribose-pucker and the sugar-base orientation alternate along the chain depending on the nature of the base (3′-endo for purine and 2′-endo for pyrimidine). The extended structure is stabilized by base-base, base-sugar, and hydrogen-bond interactions. The minihelix of two base pairs provides starting coordinates for model-building studies of the dA-dT polymer. A B-DNA-type polymer structure is described, which has sequence-dependent alternations of both the deoxyribose pucker and the phosphate diester bridge conformation. Such sequence-dependent DNA structures, if present locally in regions such as operator sequences, could facilitate sequence-specific interactions. The crystal study also suggests possible geometrical parameters for the replication fork.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360210304
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Thermal degradation of polymers. part IV. Vacuum pyrolysis of poly(m-aminostyrene). The residue and the fraction volatile at pyrolysis temperature involatile at room temperature (1969)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 13 (1969), S. 1555-1567 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The effect of the extent of degradation of poly(m-aminostyrene) on the quantity and composition of the residue and the effect of pyrolysis temperature on the fraction volatile at pyrolysis temperature are discussed. The behavior of poly(m-aminostyrene) is compared to that of polystyrene; a significant difference has been found for the behavior of the residue from poly(m-aminostyrene), which is ascribed to a crosslinking reaction involving the amino substituent. Mechanisms to acount for the observed products of degradation have been suggested and are discussed. Relative thermal stability studies have also been made and compared with results from polystyrene.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1969.070130718
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Thermal degradation of polymers. II further thermogravimetric and differential thermal analysis studies of atactic poly(m-aminostyrene) homopolymers, copolymers, and related polymers (1969)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 13 (1969), S. 401-415 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Thermogravimetric and differential thermal analysis have been employed to study the effect on the thermal degradation pattern in static air of the molecular weight of poly(m-aminostyrene) homopolymers and copolymers with styrene. Related substituted styrene polymers and copolymers with styrene have also been studied in order to assess the effect of introduction of amino, substituted amino, and hydroxy groupings into a polystyrene main chain. The effect of these groupings on the thermal stability of the polymers as compared with polystyrene suggests that the inherent antioxidant characteristics of the subtituent grouping plays the major role in stabilization. A molecular weight effect has been shown to be operative for m-aminostyrene, p-N,N-dimethylaminostyrene, and m-hydroxystyrene polymers. This manifests itself in terms of different thermograms rather than by significantly influencing the procedural decomposition temperatures, although a trend is seen.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1969.070130301
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    High spectral and angular resolution studies of sputtered zirconium atoms (1989)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 14 (1989), S. 607-610 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: We present the first results from a new apparatus for high spectral and angular resolution studies of sputtered neutral species. The sputtering experiments employ laser-induced fluorescence and a compact fiber-optic-based detection system to yield state-specific angular distributions for the sputtered atom flux. The angular resolution is of the order of 3° and a 260 MHz residual Doppler shift is estimated for the observed atomic transitions. The angular distribution for ground-state zirconium atoms shows clear deviations from the cosine dependence expected from linear cascade theory when sputtered by 1.5 keV Ar+ ions incident at 60° from the surface normal. The peaking of the distribution in the forward direction suggests that a significant fraction of the atoms is ejected by a direct mechanism.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740141008
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Electron-stimulated desorption of neutrals from 6063 aluminum - velocity distributions detected by 193 nm non-resonant laser ionizationThis paper has been authored by a contractor of the U.S. Department of Energy, BES-Materials Sciences, under contract No. W-31-109-ENG-38. Accordingly, the U.S. Government retains a non-exclusive, royalty-free license to publish or reproduce the published form of this contribution, or allow others to do so, for U.S. Government purposes. (1989)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 14 (1989), S. 647-655 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Electron-stimulated desorption of neutrals from methanol-dosed 6063 aluminum alloy has been monitored by laser ionization at 193 nm wavelength. Primary electron energies were in the range 1-3 keV. Time-of-flight spectra for the neutral desorbate were characterized by a low value of the peak velocity (250 m s-1) and a non-Boltzmann form of the distribution. Neutral desorption was ascribed to the parent methoxy (CH3O) species, based on mass spectrometry of the laser-ionization fragmentation pattern as a function of intensity. Ionic desorption was dominated by H+, which was observed to have kinetic energy peaked at ∼3 eV. Approximate estimates of neutral and ion yields were made, based on ion-optical modeling of apparatus transmission characteristics.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740141013
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    The heat of dehydration of alumina trihydrate (1978)
    New York, NY [u.a.] : Wiley-Blackwell
    Fire and Materials 2 (1978), S. 37-38 
    Details
    ISSN: 0308-0501
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Architecture, Civil Engineering, Surveying , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fam.810020110
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...