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  • 1985-1989  (5)
  • 1970-1974  (1)
  • 1965-1969  (3)
  • Chemistry  (7)
  • Cytokinesis  (1)
  • Elution  (1)
  • 1
    Electronic Resource
    Electronic Resource
    A simple method for elution of IgA deposits from the skin of patients with dermatitis herpetiformis (1989)
    Springer
    Archives of dermatological research 281 (1989), S. 406-410 
    Details
    ISSN: 1432-069X
    Keywords: Dermatitis herpetiformis ; Immunoglobulins ; Complement components ; Elution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary To better understand the role of autoimmunity in the pathogenesis of dermatitis herpetiformis, linear IgA bullous dermatosis or other skin disorders, the antigenic specificity of the immune reactants bound in vivo in the skin must be identified. In order to do so, one must first be able to elute these immune reactants from the skin. We describe here a simple method of eluting not only specifically bound IgG, but also IgA and other immunoglobulins and complement components from skin biopsy material. The method involves cutaneous washing of the entrapped serum proteins in PBS pH 7 and pH 5 buffers followed by specific immunoglobulin elutions at pH 3 and 2. The IgA deposits which could not be removed by this treatment were eluted by a combination of low pH (0.5 M citrate pH 2) and a chaotropic agent (2 M NaCl). The relative concentration of IgA in eluates when quantitated by fluoroimmunoassay were three-to five-fold higher in dermatitis herpetiformis skin biopsy specimens, than in eluates of bullous pemphigoid or normal skin biopsy specimens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00455326
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  • 2
    Electronic Resource
    Electronic Resource
    Some aspects of cleavage in Pomatoceros triqueter eggs (1972)
    Springer
    Cell & tissue research 123 (1972), S. 486-495 
    Details
    ISSN: 1432-0878
    Keywords: Pomatoceros triqueter ; Cytokinesis ; Surface folding ; New surface membrane ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The first cleavage division of Pomatoceros triqueter eggs is described. Time-lapse microcinematographic and electron microscopic studies revealed that, prior to division, the plasma membrane was folded into pleats. These were not present after division. This fact pointed to an unfolding of the plasma membrane which enabled it to cover the increased surface area resulting from cleavage. It is suggested that the pre-cleavage folds are derived from the membranes of the cortical granules, which continue releasing their contents into the perivitelline region following fertilization and first division. Filamentous material in the form of a band was present subjacent to the plasma membrane in the region of the furrow. The individual filaments of this band measure 5 to 7 nm in cross section, the dimensions being similar to those described for other kinds of dividing cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335544
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  • 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
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  • 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
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  • 5
    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
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  • 6
    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
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  • 7
    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
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  • 8
    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
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  • 9
    Electronic Resource
    Electronic Resource
    Reaktionen von (η2-Ethen)bis(triphenylphosphan)-platin(0) mit dimerem Hexafluorthioaceton Darstellung und Struktur von Platinacyclopentan- und -cyclopropanderivaten (1986)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 542 (1986), S. 46-52 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of (η2-Ethene)bis(triphenylphosphane)platinum(0) with Dimeric Hexafluorothioacetone. Preparation and Structure of Platina Cyclopentane and Cyclopropane DerivativesThe five-membered (CS)2Pt ring 1 was obtained by the reaction of 2, 2, 4, 4-tetrakis(trifluoromethyl)-1,3-dithietane and (η2-ethene)bis(triphenylphosphane)platinum(0) at low temperatures. 1 is converted at its melting point to the three-membered CSPt ring derivative 2, with elimination of one molecule of hexafluorothioacetone. 2 is also formed directly when the reaction is conducted at temperatures above +30°C. 2 was characterized by an X-ray Structural analysis.
    Notes: Der fünfgliedrige (CS)2Pt-Cyclus 1 kann aus 2, 2, 4, 4-Tetrakis(trifluormethyl)-1,3-dithietan und (η2-Ethen)bis(triphenylphosphan)-platin(0) bei tiefer Temperatur erhalten werden. 1 wandelt sich an seinem Schmelzpunkt unter Abspaltung eines Moleküls Hexafluorthioaceton in den um zwei Ringglieder reduzierten CSPt-Ring 2 um, der auch auf direktem Wege durch Umsetzen des Dithietans bei Temperaturen oberhalb von +30° zugänglich ist. 2 konnte erstmals durch eine Kristallstrukturbestimmung charakterisiert werden.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19865421108
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