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  • Chemistry  (4)
  • 66.3L  (1)
  • Mobile elements  (1)
  • 1985-1989  (4)
  • 1970-1974  (2)
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Keywords
Publisher
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Year
  • 1
    Electronic Resource
    Electronic Resource
    On the generation and annealing of dangling bond defects in hydrogenated amorphous silicon (1988)
    Springer
    Applied physics 45 (1988), S. 41-51 
    Details
    ISSN: 1432-0630
    Keywords: 66.3L ; 68.60 ; 72.80N
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We show that, through the diffusive re-arrangement of Si-H bonds, the a-Si∶H lattice is able to establish thermal equilibrium between the densities of band tail trapped charge carriers and dangling bond defects. When this equilibrium is disturbed by changes in temperature, carrier injection or illumination, dangling bond defects have to be generated or annealed out via H-diffusion processes. Based on the concept of charge-induced bond breaking, we develop a mathematical formalism for the diffusive re-arrangement of Si-H bonds and show that our formalism can account for a variety of observations that have been made in the context of defect-generation and annealing experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00618762
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  • 2
    Electronic Resource
    Electronic Resource
    Insertion mutation inactivates the expression of the recessive oncogene lethal(2)giant larvae of Drosophila melanogaster (1986)
    Springer
    Molecular genetics and genomics 204 (1986), S. 58-63 
    Details
    ISSN: 1617-4623
    Keywords: Drosophila recessive oncogene ; Mutations ; Molecular cloning ; Mobile elements ; Transcription
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The Drosophila recessive oncogene lethal(2)giant larvae is located at the extreme left end of the second chromosome close to telomeric repetitive sequences. Of the 20 l(2)gl mutant alleles isolated from wild flies in widespread populations of the Soviet Union and California, all but two appear to represent large deletions which have removed the telomeric repetitive sequences and l(2)gl single copy sequences (Mechler et al. 1985). We have analyzed the structure of the two exceptions: the l(2)glGB52 mutation results from the insertion of a single transposable element of the B104 or roo family, whereas the more complex rearrangements of the l(2)glDV275 mutation consists of an 8 kb interstitial deletion whose breakpoints have become associated with a large transposed DNA fragment. Characterization of this fragment shows that it consists of B104 sequences flanked on one side by sequences originating from the chromosomal region 24D. Furthermore, we show that in both mutants normal transcription of the l(2)gl gene is abolished.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00330187
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  • 3
    Electronic Resource
    Electronic Resource
    Bekturov, E. A.; Bakauova, Z. Kh.: Synthetic Water-Soluble Polymers in Solution 241 S., 87 Abb., 30. Tab., Format 15 × 23 cm. Basel/Heidelberg/New York: Huethig & Wepf 1986 (1987)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 329 (1987), S. 1038-1038 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19873290613
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  • 4
    Electronic Resource
    Electronic Resource
    Zur Erfassung von scheinbaren Wärmeleitzahlen quer zur Strömungsrichtung in gasdurchströmten Schüttungen (1972)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 44 (1972), S. 1309-1312 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Es werden Meßergebnisse der scheinbaren radialen Wärmeleitzahlen mitgeteilt. Ausgehend von differenziellen Wärmebilanzen werden mathematische Zusammenhänge entwickelt, aus denen in Zusammenhang mit den experimentellen Ergebnissen hervorgeht, daß die scheinbare Wärmeleitzahl in radialer Richtung einer gasdurchströmten Schüttung in erster Näherung eine Funktion der Massenstromdichten sowie der spezifischen Wärme des Gases darstellt. Die Wärmeleitzahlen wurden aus an einer Versuchsanlage mit 80 mm lichter Weite und ca. 1800 mm Länge gemessenen Temperatur-Quer- und Längs-Profilen errechnet. Die Versuche wurden für Wärmestrom-richtung von innen nach außen und umgekehrt durchgeführt und die Ergebnisse an einem Rohr mit kleinem Durchmesser überprüft.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330442306
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  • 5
    Electronic Resource
    Electronic Resource
    Zur Kinetik der photoinduziertenRadikalpolymerisation mit Elektronendonator/Elektronenakzeptor-InitiatorsystemenLichtinitiierte Polymer- und Polymerisationsreaktionen 33. Mitt.; 32. Mitt.: Kronfeld, K. P.; Timpe, H.-J.: J. Photochem.; zur Publikation eingereicht.Herrn Prof. Dr. W. Pritzkow zum 60. Geburtstag gewidmet (1988)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 330 (1988), S. 704-716 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Kinetics of Photoinduced Radical Polymerization with Electron Donor/Electron Acceptor Initiator SystemsBy means of benzyltriphenylphosphonium tetrafluoroborate (P⊕) and anthracene (An) as photoinitiator system and methylmethacrylate (MMA) as monomer the influences of several reaction parameters on the polymerization quantum yield Φp, were studied. The following principal reactions proceed: electron transfer between excited An (1An) and P⊕ salt (kq = 2,5 · 109 M-1 s-1), quenching of 1An by MMA (kqMMA = 1,3 · 107 M-1 s-1), reaction between a 1An…P⊕ salt complex and MMA. The last reaction is assumed, since from the disappearance of An and the formation of An cation radical, respectively, rate constants kqMMA 〉 108 M-1 s-1 have been calculated. Furthermore, it is assumed, that only the quenching of 1An by MMA (Φp = 3,8) and the addition of free radicals, produced by the photoinduced electron transfer, lead to polymer formation. Kinetic equations were developed, which can explain the effect of P⊕-salt concentration, light intensity and MMA concentration on Φp data. The quotient obtained for kp/kt0,5 is in the range of 0,053 to 0,087 M-0,5 s-0,5, depending on the used experimental parameters. Polymerization degrees Pn of 260-590 were found, which also depend on the experimental parameters.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19883300505
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  • 6
    Electronic Resource
    Electronic Resource
    Schwingungsspektren und Struktur von Dioxotrifluoromolybdaten und -wolframaten (1972)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 389 (1972), S. 177-187 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The infrared and Raman spectra of AIMeO2F3 (Me = Mo; AI = K, NH4, Rb, Cs, Tl; Me = W, AI = Rb, Cs) have been recorded and assigned. The postulated structure model of MeO2F3- has been confirmed by a single crystal X-ray study of CsMoO2F3. Octahedrally coordinated metal atoms are linked by cis-bridging fluorine atoms into infinite chains. The cis oxygen atoms are coplanar with the bridging fluorine atoms.
    Notes: Die Infrarot- und RAMAN-Spektren der Salze AIMoO2F3 (AI = K, NH4, Rb, Cs, Tl) und der erstmalig dargestellten AIWO2F3 (AI = Rb, Cs) wurden registriert und zugeordnet. Das daraus abgeleitete Strukturmodell für das Ion MeO2F3- wurde durch eine röntgenographische Strukturuntersuchung an CsMoO2F3 bestätigt. In MeO2F3- ist das Me-Atom verzerrt oktaedrisch koordiniert (MeO2F2F2/2). Die Oktaeder sind durch cis-stehende Fluoratome zu unendlichen Ketten verknüpft, die cis-dioxo-Gruppe steht koplanar zu den Brückenatomen.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19723890209
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