ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

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
Filter
  • Chemistry  (5)
  • Chemical Engineering  (1)
  • Aftershocks
  • Frog (Rana n. nigromaculata)
  • 1985-1989  (5)
  • 1989  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Chemical dehydrofluorination and electrical conductivity of poly(vinylidene fluoride) films (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 168 (1989), S. 205-216 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wurde die Dehydrofluorierung von Polyvinylidenfluorid (PVDF)-Pulvern und -Filmen durch verschiedene basische Lösungen untersucht. Speziell die Reaktivität von 1,8-Diazabicyclo[5.4.0]-7-undecen (DBU) in Ethanol, KOH in 2-Propanol und wäßriger NaOH-Lösung mit Tetrabutylammoniumbromid wurde mit Hilfe von Veränderungen der Absorptionsbanden von PVDF-Filmen im Infrarot-(IR) und Ultraviolett-sichtbaren Bereich (UV-VI) untersucht. Neben den durch DBU oder KOH bewirkten Eliminierungsreaktionen treten sicherlich auch Substitutionsreaktionen auf. Die elektrische Leitfähigkeit von dehydrofluorierten PVDF-Filmen nimmt durch Dotierung mit Iod merklich zu, und die Aktivierungsenergien der Leitung liegen zwischen 0,4 und 0,5 eV. Verstrecken eines dehydrofluorierten und mit Iod dotierten PVDF-Films führt zu einer Anisotropie der Leitfähigkeit.
    Notes: The dehydrofluorination of poly(vinylidene fluoride) (PVDF) powder and films was studied using several kinds of base solution. Especially the reactivity of 1,8-diazabicyclo[5.4.0]-7-undecene (DBU) in ethanol, KOH in 2-propanol and aqueous NaOH solution with tetrabutylammonium bromide was investigated by the change in infrared (IR) and ultraviolet-visible (UV-VI) absorptions of PVDF films. The elimination reactions by DBU or KOH were considered to be accompanied by substitution reaction. The electrical conductivity of dehydrofluorinated PVDF films increased markedly by doping with iodine, and the activation energies of conduction were found to be between 0.4 and 0.5 eV. When a drawn PVDF film was dehydrofluorinated and doped with iodine, anisotropy in conductivity was observed.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1989.051680117
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Persistent free radicals in the graft polymerization of methyl methacrylate to crosslinked polystyrene beads (1989)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 27 (1989), S. 295-299 
    Details
    ISSN: 0887-6258
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1989.140270903
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Stability of immobilized maltotetraose-forming amylase from Pseudomonas stutzeri (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 33 (1989), S. 845-855 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The stability of immobilized maltotetraose (G4)-forming amylase (1,4-α-D-glucan maltoteraohydrolase, EC 3.2.1.60) from Pseudomonas stutzeri was investigated in both batch and continous processes. The inactivation process of the immobilized enzyme seemed to obey first-order kinetics, and the immobilized enzyme became more stable when coexisting with 20-30 wt % substrate and calcium ions. From intensive studies on the operational stability in the continuous process, the apparent half-life of G4 productivity in a constant-flow system was mainly affected by the reaction temperature, substrate concentration, and initial immobilized enzyme activity. A new factor, immobilized enzyme stability factor fs, was proposed to evaluate the half-life of the immobilized enzyme system.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260330708
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Relationship between electron sensitivity and chemical structures of polymers as electron beam resists. VI: Electron sensitivity of various acetalized poly(vinyl alcohol)s (1989)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 29 (1989), S. 353-358 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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: Acetalized poly(vinyl alcohol)s which were synthesized from poly(vinyl alcohol) (PVA) and aldehyde or ketone were evaluated as electron beam (EB) resists, in order to investigate the relationship between EB sensitivity and chemical structures of the polymers. It was found that the acetalized PVAs were easily crosslinked by EB exposure. The main mechanism of crosslinking may be radical reaction at acetal group. The sensitivity of the acetalized PVA depended on the structure of the acetal group. Acetalized PVAs synthesized from benzaldehyde, in which the electron attracting group was substituted on the benzene ring and from linear aliphatic aldehyde having a long alkyl chain, had high sensitivity. A high sensitivity of 7.2 × 10-7 C/cm2 was attained when the acetalized PVA synthesized from p-chloro-benzaldehyde was used. Acetalized PVAs synthesized from PVA and aldehyde having a cyclic structure had an excellent dry etching durability and were suitable as negative EB resists.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760290602
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Characterization of human residual catalase of an acatalasemic patient by isoelectric focusing and sodium dodecyl sulfate-polyacrylamide gel electrophoresis followed by electrophoretic blotting and immunodetection (1989)
    Weinheim : Wiley-Blackwell
    Electrophoresis 10 (1989), S. 194-198 
    Details
    ISSN: 0173-0835
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Isoelectric points and subunit sizes of catalases in human blood and human cultured skin fibroblasts from acatalasemic and normal subjects were analyzed by isoelectric focusing in agarose gel and by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, respectively, followed by electroblotting to polyvinylidene difluoride membranes for immunodetection. The results indicated that the isoelectric point of residual catalase in the C fraction prepared from acatalasemic erythrocytes was identical with that of catalase prepared from normal erythrocytes. The residual catalase in homogenates of acatalasemic cultured skin fibroblasts also reacted with anticatalase rabbit serum and had an isoelectric point identical with that of normal catalase. Sub-unit sizes of normal and acatalasemic catalases in the C fractions of erythrocytes were also found to be identical on sodium dodecyl sulfate-polyacrylamide gel electrophoresis, followed by electroblotting and immunoenzymatic amplification. The results indicated no substantial difference in molecular size and charge of catalase proteins between normal and acatalasemic erythrocytes and fibroblasts.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.1150100308
    Location Call Number Expected 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...