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  • 1
    Electronic Resource
    Electronic Resource
    Transfer of a dominant gene for resistance to eyespot disease from a wild grass to hexaploid wheat (1983)
    [s.l.] : Nature Publishing Group
    Nature 303 (1983), S. 698-700 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The breeding scheme is represented in Fig. 1. A hybrid was obtained between the donor and the bridge species, which was male sterile, probably due to the lack of homology between the genome complements of its progenitors. The meiosis of this hybrid was irregular and the egg cells generated ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/303698a0
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  • 2
    Electronic Resource
    Electronic Resource
    Diacylglycerol and phorbol ester stimulate secretion without raising cytoplasmic free calcium in human platelets (1983)
    [s.l.] : Nature Publishing Group
    Nature 305 (1983), S. 317-319 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The methods for incorporating quin2 into intact cells and using its fluorescence to monitor [Ca2*! have been detailed elsewhere, together with evidence that the trapped indicator is largely confined to the cytoplasm and measures cytoplasmic free calcium17'18. Shape-change and aggregation were ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/305317a0
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  • 3
    Electronic Resource
    Electronic Resource
    Exon duplication and divergence in the human preproglucagon gene (1983)
    [s.l.] : Nature Publishing Group
    Nature 304 (1983), S. 368-371 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A 992-base pair (bp) fragment from the Syrian hamster preproglucagon cDNA2, which included the 540-bp coding region, and 28 bp of the 5'-untranslated region and 424 bp of the 3'-untranslated region, was hybridized to EcoRl digests of human and hamster DNA using conditions which stabilize ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/304368a0
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  • 4
    Electronic Resource
    Electronic Resource
    Notizen. Sterisch gesteuerte Reaktionswege von substituierten 2-Norbornyl-Kationen (1983)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 116 (1983), S. 815-818 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Steric Control in the Reaction of Substituted 2-Norbornyl CationsThe reaction of camphenilone (1b) with trifluoromethanesulfonic anhydride (Tf2O) yields 7,7-dimethyl-1,exo-2-bis(trifluoromethylsulfonyloxy)norbornane (4b) (60%). 6,6-Dimethyl-2-norbornanone (1c) affords under the same conditions 6,6-dimethyl-2-norbornen-2-yl triflate (5c) (70%). The reaction pathways of the intermediate 2-(trifluoromethylsulfonyloxy)-2-norbornyl cations are mostly controlled by steric factors, the inductive effect playing no significant role.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19831160237
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  • 5
    Electronic Resource
    Electronic Resource
    Relation between structure and thermal transitions in comb-like polymers, 1. Poly(N-n-alkylmaleimide)sDedicated to Prof. Dr. D. C. Pepper, on the occasion of his 65th birthday (1983)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 184 (1983), S. 2643-2659 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A series of nine poly(N-n-alkylmaleimide)s (PMIs) with the n-alkyl side chain ranging in length from ethyl to octadecyl and including only the even members of the series was studied by differential scanning calorimetry (DSC) from 100 K to above the glass transition temperature. The nine members of the PMI series generally were found to exhibit a glass transition temperature (Tg), a sub-glass transition temperature (sub-Tg = Tγ), and, but only the four higher homologs a melting point (Tm) with the respective melting enthalpy (ΔHf). The glass transition of the amorphous members is directly related to the number of methylene groups (including terminal methyl) of the n-alkyl side chain of the repeating unit. The values of Tg estimated according to a semi-empirical equation are in good agreement with the experimental data. The melting points of the members of the series presenting crystallinity in the n-alkyl side chain were analyzed. A good fit of a Garner plot by a least-mean-squares procedure is obtained with T0m = 408,0K, a = -6,26 and b = -2,03. The contribution to the heat of melting per methylene unit clearly demonstrates that the hexagonal paraffin crystal structure is present in the crystalline members, in agreement with X-ray data. The data when analyzed by Jordan′s procedure show that only part of the n-alkyl side chain is forming a crystal lattice.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1983.021841222
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  • 6
    Electronic Resource
    Electronic Resource
    Poly(vinyl alcohol) modification with n-alkyl chloroformates (1983)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 112 (1983), S. 205-215 
    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: Die Umsetzung von n-Alkyl-chlorformiat mit Polyvinylalkohol, katalysiert durch Pyridin, wurde untersucht. Die Struktur der modifizierten Polymeren wurde durch IR-, 1H- und 13C-NMR-Spektroskopie und chemische Analysen bestimmt. Es entstehen Vinylalkohol-Vinyl-n-alkylcarbonat-Copolymere. Die Anwesenheit von cyclischen Carbonaten wurde nicht beobachtet. Es wurde eine lineare Abhängigkeit der Reaktionsgeschwindigkeit von den Konzentrationen an Polymerem, n-Alkyl-chloroformiat und Pyridin gefunden. Die Aktivierungsenergie ergab sich zu 15.4 kcal/mol. Das im Copolymeren absorbierte Wasser läßt den Schluß zu, daß der hydrophile Charakter des Copolymeren allmählich abnimmt, wenn der Gehalt an Seitenkettensubstanz steigt. Im Wasser unlösliche Vinyl-alkohol-Vinyl-n-alkylcarbonat-Copolymere wurden in alkalischem Medium hydrolysiert; nach einem bestimmten Hydrolysegrad gewinnen die Polymeren die Wasserlöslichkeit zurück.
    Notes: This work deals with the modification reaction of poly(vinyl alcohol) with n-alkyl chloroformates using pyridine as catalyst. The structure of the modified polymers was determined by means of IR, 1H and 13C-NMR spectroscopy as well as by chemical analysis. Vinyl alcohol-vinyl n-alkyl carbonate copolymers were obtained. The presence of cyclic carbonates has not been observed. It has been found a linear dependence of reaction rate on polymer, n-alkyl chloroformates, and pyridine concentrations, respectively. The activation energy found was of 15.4 kcal/mol. The water absorbed in the copolymers made it reasonable to conclude that the hydrophilic character of the copolymers decreased progressively when either the carbonate groups content or the side chain length increased. Water insoluble alcohol-vinyl n-alkyl carbonate copolymers were hydrolyzed in an alkaline medium. They were found to recover their solubility in water after a certain hydrolysis extent was reached.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1983.051120115
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  • 7
    Electronic Resource
    Electronic Resource
    Water-insoluble dextran polymers by grafting of hydrophobic groups. I. Reaction with butyric anhydride and heterogeneous hydrolysis of the partially modified dextran (1983)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 118 (1983), S. 53-63 
    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: Die Umsetzung von Dextran mit Buttersäureanhydrid, katalysiert durch Pyridin, wurde untersucht. Die Struktur der modifizierten Polymeren wurde durch IR-, 1H-NMR-Spektroskopie und chemische Analysen bestimmt. Es wurde eine lineare Abhängigkeit der Reaktionsgeschwindigkeit vom Produkt der Konzentrationen von Pyridin und Buttersäureanhydrid gefunden. Die Aktivierungsenergie betrug 7, 0 kcal/mol. Ein teilmodifiziertes Dextran (D. S. 1,34) wurde unter verschiedenen Bedingungen in bezug auf pH und Temperatur hydrolysiert. Die experimentellen Werte wurden als eine Reaktion pseudo-erster Ordnung bezüglich der Konzentration des Butyrats behandelt, wobei Aktivierungsenergien von 12,5 und 12,0 kcal/mol für die sauer und basisch katalysierten Verseifungsreaktionen erhalten wurden.
    Notes: A study has been made on the modification reaction of dextran with butyric anhydride using pyridine as catalyst. The structures of the modified polymers were determined by means of IR and 1H-NMR spectroscopy as well as by chemical analysis. It has been found a linear dependence of the reaction rate on the product of butyric anhydride and pyridine concentrations and a more complex dependence on the alcoholic groups concentration. The activation energy was found to be 7.0 kcal/mol. A partially modified dextran (D.S. 1.34) was hydrolyzed at several pH values and temperatures. The experimental data have been treated as a pseudo-first-order reaction with respect to the butyrate concentration. The activation energies obtained from the acid and base catalyzed hydrolysis reactions were 12.5 and 12.0 kcal/mol, respectively.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1983.051180104
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  • 8
    Electronic Resource
    Electronic Resource
    Chemical homogeneity of vinyl alcohol/vinyl ethyl carbonate copolymers (1983)
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 4 (1983), S. 297-301 
    Details
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1983.030040506
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