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  • Polymer and Materials Science  (2)
  • Orchidaceae  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Studies in the embryology of the diandrous orchidCypripedium cordigerum (Cypripedieae, Orchidaceae) (1988)
    Springer
    Plant systematics and evolution 160 (1988), S. 159-168 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Orchidaceae ; Cypripedieae ; Cypripedium cordigerum ; Embryology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The anther wall layers ofCypripedium cordigerum are six to eight. The glandular tapetum is 2- or 3-layered and its cells are uninucleate. Simultaneous cytokinesis results in decussate, isobilateral and tetrahedral pollen tetrads. Ripe pollen grains are 2-celled. The mature ovules are anatropous, bitegmic and tenuinucellate. Both the integuments are dermal in origin and 2-layered. The inner integument alone forms the micropyle. The female gametophyte is 6-nucleate and bisporic. The reduction of nuclei is due to the “strike” phenomenon. Double fertilization occurs. The primary endosperm nucleus divides to form two free endosperm nuclei. The mature embryo is undifferentiated. The cells ca, m and n contribute to the embryo. The suspensor is single-celled. The seed coat is formed entirely by the outer layer of the outer integument. There are three sterile and three fertile valves in the ovary. In the prefertilization stages these valves consist of parenchymatous cells with starch and raphides. After fertilization, the sterile valves develop sclerotic cells whereas the fertile valves remain parenchymatous. The pericarp structure and embryological features support the retention of tribeCypripedieae within theOrchidaceae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00936043
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Copolymerization reactivity ratios of N,N-dimethyl acrylamide and isopropyl methacrylate determined by 1H-NMR spectroscopy (1991)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 192 (1991), S. 51-55 
    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: N,N-Dimethylacrylamid (DMA) und Isopropylmethacrylat (IPM) wurden in Dimethylformamid mit Azoisobutyronitril als Initiator copolymerisiert. Die Copolymerzusammensetzung wurde 1H-NMR-spektroskopisch ermittelt. Die Copolymerisationsparameter (rDMA = 0,58, rIPM = 2,76) wurden nach Kelen-Tüdős berechnet.
    Notes: Copolymers of N,N-dimethyl acrylamide (DMA) and isopropylmethacrylate (IPM) were prepared in dimethyl formamide using azoisobutyronitrile as initiator. The composition of copolymers was determined by 1H-NMR analysis. Reactivity ratios (rDMA = 0.58, rIPM = 2.76) were calculated from these values by using the Kelen-Tüdős differential linear equation.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1991.051920104
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of poly(isopropyl methacrylate-co-acrylamide) (1991)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 189 (1991), S. 97-103 
    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: Isopropylmethacrylat und Acrylamid wurden mit AIBN in DMF bei 60°C copolymerisiert. Die Copolymerzusammensetzungen wurden elementaranalytisch bestimmt und die Copolymerisationsparameter nach Fineman-Ross und Kelen-Tüdős berechnet. Die Copolymeren wurden IR-und NMR-spektroskopisch sowie durch thermische und dielektrische Untersuchungen charakterisiert. Die Glastemperaturen wurden mittels DSC bestimmt.
    Notes: Free radical copolymerization of isopropyl methacrylate (IPMA) and acrylamide (AA) was carried out in the presence of 2,2′-azoisobutyronitrile in dimethyl formamide at 60°C. The copolymer compositions were established by elemental analysis. The copolymerization reactivity ratios were determined by both Fineman-Ross (F-R) and Kelen-Tüdős (K-T) methods. The copolymers were characterized by IR, 1H-NMR, thermal and dielectric studies. Glass transition temperature values (Tg) have been determined by DSC.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1991.051890109
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    Paper (German National Licenses)
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