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  • 1
    Electronic Resource
    Electronic Resource
    Statistical evidence for remnants of the primordial code in the acceptor stem of prokaryotic transfer RNA (1992)
    Springer
    Journal of molecular evolution 34 (1992), S. 471-477 
    Details
    ISSN: 1432-1432
    Keywords: Transfer RNA ; Acceptor helix stem ; Primordial code ; Statistics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The specificity of interaction of amino acids with triplets in the acceptor helix stem of tRNA was investigated by means of a statistical analysis of 1400 tRNA sequences. The imprint of a prototypic genetic code at position 3–5 of the acceptor helix was detected, but only for those major amino acids, glycine, alanine, aspartic acid, and valine, that are formed by spark discharges of simple gases in the laboratory. Although remnants of the code at position 3–5 are typical for tRNAs of archaebacteria, eubacteria, and chloroplasts, eukaryotes do not seem to contain this code, and mitochondria take up an intermediary position. A duplication mechanism for the transposition of the original 3–5 code toward its present position in the anticodon stern of tRNA is proposed. From this viewpoint, the mode of evolution of mRNA and functional ribosomes becomes more understandable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00160461
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  • 2
    Electronic Resource
    Electronic Resource
    Plasma and surface modeling of the deposition of hydrogenated carbon films from low-pressure methane plasmas (1993)
    Springer
    Applied physics 56 (1993), S. 527-546 
    Details
    ISSN: 1432-0630
    Keywords: 52.25.Dg ; 79.20.Nc ; 82.65.Yh
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The elementary mechanisms are described which determine the plasma and surface processes during the plasma-enhanced chemical vapour deposition of hydrogenated carbon films from methane. Corresponding model calculations are reviewed and critically discussed in comparison to experimental results. A realistic modeling requires the simultaneous and self-consistent treatment of plasma and surface effects. Several experimental data sets on plasma parameters and the growth and the composition of the films have been reproduced successfully. However, a broader experimental data base is needed for more critical tests of the models. The reliability of the modeling, in particular of the surface effects, is still limited due to the poor availability of elementary data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00331402
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  • 3
    Electronic Resource
    Electronic Resource
    Die Gerbung der Gelatine durch Formaldehyd (1921)
    Springer
    Colloid & polymer science 29 (1921), S. 45-55 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Zusammenfassung Die Gerbung der Gelatine ist ein zweiphasiger Vorgang. Die eigentliche Gerbung des gerbfähigen Anteiles ist physikalischer Natur und an diesem nimmt nur der gerinnbare Anteil der Gelatine teil. Der nicht gerinnbare Anteil der Gelatine tritt mit dem Formaldehyd in chemische Wechselwirkung unter Bildung von Methylenaminosäuren. Die der Gerbung fähige Menge der Gelatine entspricht dem Gerinnungswert der unbehandelten Gelatine Wird der gerinnbare Anteil durch Hydrolyse infolge Wasserstoffionenwirkung vermindert, so wird auch der gerbfähige Anteil dadurch vermindert. Die gerbenden Bestandteile der Formaldehydlösung sind die unlöslichen kolloiden Polymeren des Formaldehydes, die in der Hauptsache erst während der Einwirkung auf die Gelatine entstehen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01425137
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis of affinity chromatography and electrophoresis matrices for the purification of bile acid transport proteins (1991)
    Springer
    Chromatographia 32 (1991), S. 265-268 
    Details
    ISSN: 1612-1112
    Keywords: Affinity chromatography ; Affinity electrophoresis ; Bile acid transport proteins ; Bile acid derivatives
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary For the purification of the bile acid transport proteins from rat hepatocytes high affinity taurocholic acid derivatives were synthesized. One type was designed for coupling to a Sepharose matrix and the other for copolymerization with acrylamide. The resulting matrices were found to be suitable for affinity chromatography and affinity electrophoresis. In both syntheses, 3α, 12α-dihydroxy-7β-amino (tauro) cholic acid derivatives were used as the starting material, since substitution in this position had previously been shown not to alter transport affinity constant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02276251
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  • 5
    Electronic Resource
    Electronic Resource
    Structural and functional differentiation of the embryonic chick pineal organ in vivo and in vitro (1990)
    Springer
    Cell & tissue research 260 (1990), S. 337-348 
    Details
    ISSN: 1432-0878
    Keywords: Pineal organ ; Organ culture ; Pinealocytes ; Differentiation ; Melatonin ; Radioimmunoassay ; Chick embryo
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The development of sensory structures in the pineal organ of the chick was examined by means of scanning electron microscopy from embryonic day 10 through day 12 post-hatching. At embryonic day 10, the wall of the tubules within the pineal primordium is composed of cells with unspecialized luminal surface. Differentiation of sensory structures starts at embryonic day 12 when pinealocytes and supporting cells can be distinguished. Pinealocytes are recognized by virtue of an inner segment only rarely endowed with a cilium, whereas supporting cells exhibit numerous short microvilli. Further differentiation of the sensory apparatus is achieved by development of an oval-shaped, biconcave swelling at the tip of the cilium, 1×2 μm in size, and a collar of long microvilli at the base of the inner segment. Membrane specializations of sensory cilia, however, were not detected. Since during embryonic life new tubules and follicles are continuously formed, all stages of differentiation of sensory structures are found in the chick pineal organ during the second half of the incubation period and the first two weeks after hatching. In 200-μm-thick Vibratome sections of chick-embryo pineal organs cultured in medium BM 86 Wissler for periods up to 13 days the cytodifferentiation parallels the development in vivo. Using an organ-culture system the 24-h release of melatonin into the culture medium was measured by means of radioimmunoassay after solid-phase extraction. At embryonic day 10, the 24-h secretion of melatonin was at the lower range of detection of the RIA (5 pg). The rapid increase in 24-h secretion in melatonin until hatching (∼50 μg) is approximated by an exponential curve.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318636
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  • 6
    Electronic Resource
    Electronic Resource
    Zur Untersuchung der Gerbstoffe, bezw. des Leders (1920)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 59 (1920), S. 97-99 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01365097
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  • 7
    Electronic Resource
    Electronic Resource
    Die Adsorption des Formaldehydes durch Tierkohle (1921)
    Springer
    Colloid & polymer science 28 (1921), S. 127-132 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Zusammenfassung 1. Formaldehyd wird durch Tierkohle sowohl in saurer als auch in neutraler Lösung in bedeutendem Maße adsorbierl. 2. Die Adsorption sowohl in neutralisierter als auch saurer Lösung folgt den Adsorptionsgesetzen, d. h. die Adsorption ist abhängig von der Konzentration. 3. Die Adsorption des Formaldehydes durch die Tierkohle in saurer Lösung ist ferner in weitgehenstem Maße von dem Volum abhängig. Aus großem Volum wird erheblich mehr, als aus kleinem Volum bei gleicher Konzentration adsorbiert. 4. In neutraler Lösung wird die Adsorption des Formaldehydes unabhängig von dem Volum und ist lediglich abhängig von der dargebotenen absoluten Menge des Formaldehydes bezw. der Konzentration. 5. Die Adsorption in neutraler Lösung ist unabhängig von der Zeit und tritt das Gleichgewicht nach kurzer Einwirkungsdauer ein. Die Adsorption aus saurer Lösung ist abhängig von der Zeit und tritt selbst nach 8 tägiger Einwirkung kein Gleichgewicht ein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01427881
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  • 8
    Electronic Resource
    Electronic Resource
    Die Gerinnungserscheinungen in Gelatine-Chlornatriumlösungen (1921)
    Springer
    Colloid & polymer science 28 (1921), S. 281-290 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Zusammenfassung 1. Es wurde der Gerinnungswert verdünnter, mit Chlornatrium gesättigter Gelatinelösungen durch Säuren ermittelt. 2. Der Gerinnungswert steigt mit dem Dissoziationsgrad der Säure und ist demnach bei anorganischen Säuren größer, wie bei organischen. 3. Das Maximum der Gerinnung der daran beteiligten Trockensubstanz der Gelatinelösung durch irgendeine Säure liegt bei einer ganz bestimmten Konzentration. 4. Neben der Gerinnung finden Adsorptionserscheinungen zwischen dem geronnenen Teil und der Säure in Verbindung mit den nicht der Gerinnung fähigen Anteilen statt. 5. Die Erscheinungen wurden nach der Mizellar-Hypothese von Nägeli's erklärt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01464428
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  • 9
    Electronic Resource
    Electronic Resource
    Hermetische Mikroelektronik-Verkapselungen in der Luft- und Raumfahrt zur Vermeidung von Korrosion (1993)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 44 (1993), S. 124-129 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Corrosion-resistant, hermetic microelectronic packages for aerospace applicationsCorrosion-resistant, high reliable aerospace electronics need expensive ceramic substrates, noble metal conductors and very clean stainless steel or ceramic packages. The requirements, material technologies, problems and more economical packages are described.
    Notes: Zur Vermeidung von Korrosionsschäden an Sicherheitselektroniken der Luft- und Raumfahrt sowie der Wehrtechnik werden vorzugsweise Keramik-Substrate und Edelmetall-Leiter sowie völlig feuchte- und salzfreie, hermetisch verschlossene Metall oder Keramikgehäuse verwendet. Die Anforderungen, Materialien, Technologien und Probleme der hermetischen Mikroelektronik-Verpackung wird im folgenden Aufsatz näher beschrieben werden.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19930440404
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  • 10
    Electronic Resource
    Electronic Resource
    Die Vorgänge bei der Gerbung I (1920)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 33 (1920), S. 221-223 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19200337602
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