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  • 1
    Electronic Resource
    Electronic Resource
    Synthese von 1,2,3,3,6,6-Hexamethyl-1-cyclohexen - Eine Umlagerungskaskade von C12H23+-Kationen (1983)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 116 (1983), S. 3624-3630 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of 1,2,3,3,6,6-Hexamethyl-l-cyclohexene - A Cascade of C12H+ Carbenium Ion Rearrangements6-Chloro-2,6,7,7-tetramethyl-2-octene (4), prepared via prenyl chloride addition to 2,3,3-trimethyl-1-butene, at room temperature undergoes a zinc chloride/hydrogen chloride-catalysed cyclocondensation to yield 1,2,3,3,6,6-hexamethyl-1-cyclohexene (1). The reaction mechanism is elucidated by isolation of intermediate five-membered carbocycles and by force field calculations.
    Notes: 6-Chlor-2,6,7,7-tetramethyl-2-octen (4), das Prenylchlorid-Additionsprodukt an 2,3,3-Trimethyl-1-buten, geht bei Raumtemperatur in Gegenwart von Zinkchlorid und Chlorwasserstoff eine Cyclokondensation unter Bildung von 1,2,3,3,6,6-Hexamethyl-1-cyclohexen (1) ein. Der Reaktionsmechanismus wird durch die Isolierung intermediär auftretender fünfgliedriger Ringe und durch Kraftfeldrechnungen aufgeklärt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19831161111
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  • 2
    Electronic Resource
    Electronic Resource
    Bemerkung zu der publikation von H. H. G. Jellinek in dieser zeitschrift, vol. 5, 264 (1950) (1951)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 6 (1951), S. 509-509 
    Details
    ISSN: 0022-3832
    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/pol.1951.120060411
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  • 3
    Electronic Resource
    Electronic Resource
    Protein staining by Coomassie Brilliant Blue G-250: Unique color rendering in iron-toned prints (1986)
    Weinheim : Wiley-Blackwell
    Electrophoresis 7 (1986), S. 482-483 
    Details
    ISSN: 0173-0835
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Black-and-white photographs of protein staining by Coomassie Brilliant Blue G-250 may be iron-toned by a modified procedure to obtain good reproduction of the original hue and range of intensities. A suitable paper and a film for transparencies are specified for printing from a given negative.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.1150071012
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  • 4
    Electronic Resource
    Electronic Resource
    Das UV-Absorptionsspektrum technischer Celluloseacetate (1951)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 7 (1951), S. 62-69 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The ultraviolet absorption spectra of fractionated cellulose acetate of varying degrees of polymerisation were measured. In the region between 3000 and 3700 Ä the absorption coefficients were found nearly linear to the wave-length of the light absorbed.The change of the absorption coefficient with increasing wave-length is nearly the same for different degrees of polymerisation.
    Notes: Es wurde das UV-Absorptionsspektrum gereinigter Celluloseacetatfraktionen verschiedenen Polymerisationsgrades bestimmt. Im Bereich von 3000 bis etwa 3700 ÄE nimmt der Absorptionskoeffizient ungefähr linear mit der Wellenlänge des eingestrahlten Lichtes ab.Die Änderung des Absorptionskoeffizienten ist bei Fraktionen verschiedenen Polymerisationsgrades für gleiche Änderungen der Wellenlänge etwa gleich groß.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1951.020070104
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  • 5
    Electronic Resource
    Electronic Resource
    Über die polymerisationsgradverteilung bei der polykondensation. Ein versuch zur deutung der tungschen gleichung (1961)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 54 (1961), S. 83-100 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: In 1956 L. H. Tung has given a quite empirical and formal mathematical relationaship, by which - appropriate plotting of data provided - it is possible to represent the distribution of DP values, as obtained by a completed polymerization (polycondensation or polyaddition), by means of a straight line. In the course of the present publication it is shown that the authors - starting from a quite different problem - have found a relationship that proves (after an insignificant simplification and by suitable interchange of symbols) to be identical with Tung's equation. According to some special ideas about the chemism, the method of deducing this equation enables the authors to interpret Tung's equations in terms of kinetics. The basic equations obtained are \documentclass{article}\pagestyle{empty}\begin{document}$$ dN/dt = - 2kNt \ \ \ {\rm and} \ dN/dP = - 2AN \left({P - 1} \right)$$\end{document} These show that the reaction rate is merely proporional to the number N of monomers and to the time t. The chain lengths of the macromolecules are suggested to be only an appropriate measure for the time elapsed from the beginning of their formation. Interpreting Tung's equation kinetically it is possible to get information about the distribution of DP values that is to be expected at a given temperature. With regard to theoretical considerations one expects the integral number 2 to be used for the exponent b in the modified equation originally given by Tung: \documentclass{article}\pagestyle{empty}\begin{document}$$N = N_{0} e^{ - A \left( {P - 1} \right)^b}$$\end{document} This value is related to the fact that the chain growth takes place in two directions because of the bifunctionality of the monomers. Therefore, the termination of the reaction will also take place in two steps. The correctness of these suggestions is confirmed by the fact that (for all known fractionations of polycondensation products) the exponent b proves to be nearly 2. Using the value b = 2 the whole chain lengths distribution of normal polycondensation products can be easily calculated by means of one single number or weight-average value of the DP as determined with an unfractionated sample.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1961.1205415907
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  • 6
    Electronic Resource
    Electronic Resource
    Über den Parachor, eine Anwendung der Oberflächenspannung zur Konstitutionserforschung chemischer Verbindungen (1929)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 42 (1929), S. 849-852 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19290423402
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  • 7
    Electronic Resource
    Electronic Resource
    Über den Parachor, eine Anwendung der Oberflächenspannung zur Konstitutionserforschung chemischer Verbindungen (1929)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 42 (1929), S. 873-877 
    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.19290423504
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  • 8
    Electronic Resource
    Electronic Resource
    Berichtigung (1930)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 43 (1930), S. 236-236 
    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.19300431105
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  • 9
    Electronic Resource
    Electronic Resource
    Dynamic chromatin: The regulatory domain organization of eukaryotic gene loci (1991)
    New York, N.Y. : Wiley-Blackwell
    Journal of Cellular Biochemistry 47 (1991), S. 99-108 
    Details
    ISSN: 0730-2312
    Keywords: chicken lysozyme gene ; loop organization of chromatin ; locus control region ; locus boundary element ; position independent expression ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: It is hypothesized that nuclear DNA is organized in topologically constrained loop domains defining basic units of higher order chromatin structure. Our studies are performed in order to investigate the functional relevance of this structural subdivision of eukaryotic chromatin for the control of gene expression. We used the chicken lysozyme gene locus as a model to examine the relation between chromatin structure and gene function. Several structural features of the lysozyme locus are known: the extension of the region of general DNAasel sensitivity of the active gene, the location of DNA-sequences with high affinity for the nuclear matrix in vitro, and the position of DNAasel hypersensitive chromatin sites (DHSs). The pattern of DHSs changes depending on the transcriptional status of the gene. Functional studies demonstrated that DHSs mark the position of cis-acting regulatory elements. Additionally, we discovered a novel cis-activity of the border regions of the DNAasel sensitive domain (A-elements). By eliminating the position effect on gene expression usually observed when genes are randomly integrated into the genome after transfection, A-elements possibly serve as punctuation marks for a regulatory chromatin domain. Experiments using transgenic mice confirmed that the complete structurally defined lysozyme gene domain behaves as an independent regulatory unit, expressing the gene in a tissue specific and position independent manner. These expression features were lost in transgenic mice carrying a construct, in which the A-elements as well as an upstream enhancer region were deleted, indicating the lack of a locus activation function on this construct. Experiments are designed in order to uncover possible hierarchical relationships between the different cis-acting regulatory elements for stepwise gene activation during cell differentiation. We are aiming at the definition of the basic structural and functional requirements for position independent and high level gene expression. The result of these experiments will have important consequences for random gene transfer with predictable and reproducible expression of transgenes.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcb.240470203
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  • 10
    Electronic Resource
    Electronic Resource
    Kunstseide und Stapelfaser, von A. Zart. Technische Fortschrittsberichte Bd. 51. Herausg. Dr. B. Rassow. Verlag Dietrich Steinkopff-Darmstadt 1950. 177 S., 35 Abb., Geb. DM 19.50, brosch. DM 17.50 (1951)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 63 (1951), S. 131-131 
    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.19510630518
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