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  • Chemistry  (15)
  • Polycationic/polyanionic binding sites  (1)
  • 1980-1984  (16)
  • 1
    Electronic Resource
    Electronic Resource
    Binding of cationized and native ferritin to cellular structures of the electric organ of Torpedo marmorata (1983)
    Springer
    Cell & tissue research 230 (1983), S. 171-184 
    Details
    ISSN: 1432-0878
    Keywords: Electric organ (Torpedo marmorata) ; Polycationic/polyanionic binding sites ; Cationized ferritin ; Basal lamina ; Collagen fibrils ; Cholinergic synaptic transmission
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The distribution of polycationic and polyanionic binding sites in the electric organ of Torpedo marmorata was investigated by incubation of tissue with native (NF) and cationized (CF) ferritin. 1) Collagen fibrils from the electric organ carry rosettes of polyanionic sites on their surface with a periodicity of 60 nm, corresponding to the pattern of crossbanding in collagen fibrils. The CF-binding sites are about 30 nm in size and project 20 nm beyond the surface of the fibril. 2) As revealed by incubation of tissue homogenates, CF heavily stains the intraperiod line of the axonal myelin and also tubular structures in the axonal cytoplasm. 3) Neither the extracellular aspects of the prenor the postsynaptic membrane became labeled with either NF or CF. After incubation of tissue homogenates, labeling of the electron-dense material of the cytoplasmic aspect of the postsynaptic membrane was observed with NF and, in particular, with CF. The ventral basal lamina of the electroplaque cell revealed uniform labeling with NF. In contrast, CF-binding sites were distributed in the lamina densa of the basal lamina as a lattice of discrete binding sites, approximately 45 nm in diameter. The presence of polyanionic sites in the basal lamina, which also proceeds through the synaptic cleft, suggests the existence of a diffusion barrier for the released neurotransmitter acetylcholine. It is proposed that this facilitates hydrolysis of acetylcholine in the synaptic cleft and recirculation of the products of hydrolysis to the axon terminal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00216037
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  • 2
    Electronic Resource
    Electronic Resource
    Lehrbuch der Physikalischen Chemie. Von G. Wedler, Verlag Chemie, Weinheim  -  Deerfield Beach, Florida  -  Basel 1982. XXII, 914 S., 342 Abb., 79 Tab., geb. DM 98, - (1983)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 17 (1983), S. 65-65 
    Details
    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ciuz.19830170206
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  • 3
    Electronic Resource
    Electronic Resource
    Identifizierung von Nebenprodukten der Polybutylenterephthalatsynthese (1982)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 33 (1982), S. 38-42 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: In connection with investigations on the reaction kinetics in the synthesis of polybutylene terephthalate the composition of the destillates and volatile degradation products formed have been studied. The multicomponent mixtures were separated by gaschromatography and the structure was characterized by mass spectroscopy. Based on the compounds identified the possible side reactions occuring in the synthesis of polybutylene terephthalate are discussed.
    Notes: Im Zusammenhang mit reaktionsanalytischen Arbeiten zur Synthese von Polybutylenterephthalat wurde die Zusammensetzung von Polykondensationsdestillaten sowie von flüchtigen Abbauprodukten untersucht. Zur Charakterisierung der Mehrkomponentengemische wurde die Gaschromatographie zur Trennung und die Massenspektrometrie zur Strukturaufklärung eingesetzt. Anhand der identifizierten Verbindungen werden mögliche Nebenreaktionen der Polybutylenterephthalatsynthese diskutiert.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1982.010330108
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  • 4
    Electronic Resource
    Electronic Resource
    Chemiker-Kalender. 3. Neubearbeitete aufl. Hg. von C. SYNOWIETZ und K. SCHÄFER. Berlin/Heidelberg/New York/Tokyo: Springer Verlag 1984. 656 S. Kunststoffeinb. DM 44.- (1984)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 35 (1984), S. 618-618 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1984.010350916
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  • 5
    Electronic Resource
    Electronic Resource
    Photodegradation and photostabilization of coatings. ACS symposium series 151. Hg. von S. P. PAPPAS und F. H. WINSLOW. Washington: American Chemical Society 1981. 308 S., Lwd., $ 35.00 (1982)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 33 (1982), S. 162-162 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1982.010330218
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  • 6
    Electronic Resource
    Electronic Resource
    Kinetik und Mechanismus der durch Metallderivate katalysierten thermischen Spaltung von PolyethylenterephthalatVgl. auch H. Zimmermann: Dissertation B, Akademie der Wissenschaften der DDR, Berlin 1978 (1980)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 31 (1980), S. 686-693 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The kinetics of thermal degradation of polyethylene terephthalate containing antimony and zinc derivatives as polycondensation catalysts was investigated in an open and a closed stirred system by the increase of carboxyl groups. Based on kinetic data the allowed residence times in the processing stages of PETP melts are derived. Further, the activation entropies are calculated and the mechanism of thermal splitting of ester bonds catalyzed by metal derivatives is discussed. The suggested reaction mechanism is supported by kinetic data obtained in model experiments with ethylene glycol, diethylene glycol and butane diol-1,4-dibenzoate as well as by thermal degradation of polybutyleneterephthalate.
    Notes: Die Kinetik des thermischen Abbaus von Polyethylenterephthalat, das Antimon-bzw. Zinkderivate als Polykondensationskatalysator enthält, wurde in einem geschlossenen und in einem offenen, durchmischten System anhand der Carboxylgruppenzunahme untersucht. Aus den kinetischen Kenndaten werden Ableitungen für zulässige Verweilzeiten bei der Verarbeitung von PETP-Schmelzen getroffen, zum anderen wird auf Grundlage der aus diesen Kennwerten berechneten Aktivierungsentropien der Mechanismus der durch Metallderivate katalysierten thermischen Esterspaltung diskutiert. Der postulierte Reaktionsmechanismus wird durch die kinetischen Daten der Modellversuche mit Ethylenglykol-, Diethylenglykol-und Butandiol-1,4-dibenzoat sowie des thermischen Abbaus von Polybutylenterephthalat gestützt.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1980.010311105
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  • 7
    Electronic Resource
    Electronic Resource
    Developments in polymer degradation. Vol. 4. Hg. von N. GRASSIE. London: Applied Science Publishers Ltd. 1982. 300 S., Lwd., £35.00 (1983)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 34 (1983), S. 666-666 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1983.010341017
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  • 8
    Electronic Resource
    Electronic Resource
    High cytotoxicity and membrane permeability of Et3Pb+ in mammalian and plant cells (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Cell Biochemistry and Function 2 (1984), S. 213-216 
    Details
    ISSN: 0263-6484
    Keywords: Lead ; triethyllead ; neuroblastoma cells ; soybean cells ; tubulin ; microtubules ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Cells of mammalian origin as well as those of higher plants appear to be very sensitive to triethyllead ion (Et3Pb+). Neuroblastoma cells kept in the presence of 1 μM Et3Pb+ lost their viability within 6 h. Growth of suspension culture cells of soybean (G. max(L.)Merr.) was inhibited by 1 μM Et3Pb+, and finally the cells died. Morphologically, Et3Pb+ caused the complete breakdown of microtubular structures in neuroblastoma cells; thus microtubules appeared to be the main target for the toxin. While in a previous study the effect of Et3Pb+ on microtubules has been well documented at concentrations of 50-200 μM1, the present study demonstrates that the formation of microtubules from pig brain tubulin is disturbed at concentrations of Et3Pb+ as low as 0.5 to 1 μM. We conclude from these data that Et3Pb+ freely permeates the plasma membranes of mammalian as well as plant cells.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cbf.290020406
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  • 9
    Electronic Resource
    Electronic Resource
    Elektrochemische Synthesen. VIII. Darstellung von π-CyclopentadienylmetallverbindungenAls Abkürzung für C5H5 wird Cp verwendet. (1981)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 481 (1981), S. 107-116 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Electrochemical Syntheses. VIII. Preparation of π-Cyclopentadienyl Metal CompoundsThe electrochemical synthesis of π-cyclopentadienyl metal compounds M(π-Cp)2 (M = Fe, Co, Ni) and of cyclopentadienyl carbonyl derivatives (π-Cp)nM(CO)m(M = Fe, Co, Ni, Ti, V) has been investigated. Most of the complexes can be prepared directly from the corresponding metal anodes, monomeric cyclopentadiene (and CO) in moderate or good yields.
    Notes: Die elektrochemische Synthese von π-Cyclopentadienylmetallverbindungen M(π-Cp)2 (M = Fe, Co, Ni) und von Cyclopentadienylcarbonyl-Derivaten des Typs (π-Cp)n-M(CO)m (M = Fe, Co, Ni, Ti, V) wurde näher untersucht. Die Mehrzahl der Komplexe läßt sich direkt aus den entsprechenden Metallanoden, monomerem Cyclopentadien (und CO) in mäßigen bis guten Ausbeuten darstellen.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19814811012
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  • 10
    Electronic Resource
    Electronic Resource
    Nachpolykondensation von Polyethylenterephthalat in fester PhaseHerrn Professor Dr. Dr. h. c. Erich Correns zur Vollendung des 85. Lebensjahres gewidmet (1981)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 32 (1981), S. 250-256 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Solid state polycondensation of poly(ethylene terephthalate) was performed in flowing nitrogen, varying reaction temperature and flow rate of purge gas. The effect of concentration of end groups on the rate of reactions is be described by a kinetic model. Maximum of the rate of overall reaction is achieved at a ratio of end-groups OH/COOH = 2. The advantages of solid state polycondensation and melt polycondensation in producing high molecular weight poly(ethylene terephthalate) are compared.
    Notes: Die Festphasennachpolykondensation von Polyethylenterephthalat im Stickstoffstrom wurde unter Variation der Reaktionstemperatur und der Strömungsgeschwindigkeit des Trägergases durchgeführt. Der Einfluß der Endgruppenkonzentrationen auf die Reaktionsgeschwindigkeit konnte durch ein kinetisches Modell beschrieben werden. Ein Maximum der Geschwindigkeit der Brutto-Reaktion wird bei einem Endgruppenverhältnis OH/COOH = 2 erreicht. Vor- und Nachteile der Festphasennachpolykondensation und der Schmelzepolykondensation bei der Herstellung von hochmolekularem Polyethylenterephthalat werden miteinander verglichen.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1981.010320504
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