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  • 1990-1994  (6)
  • Polymer and Materials Science  (3)
  • cell size  (2)
  • Fertilization
  • 1
    Electronic Resource
    Electronic Resource
    Colchicine-induced heritable variation in cell size and chloroplast number in the leaf cells of inbred ryegrasses (Lolium perenne, L. multiflorum) (1991)
    Springer
    Euphytica 52 (1991), S. 39-45 
    Details
    ISSN: 1573-5060
    Keywords: Lolium multiflorum ; Italian ryegrass ; Lolium perenne ; perennial ryegrass ; cell size ; chloroplast number ; colchicine-induced changes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A 3 hr period of treatment with a 0.2% aqueous solution of colchicine was given to one week old seedlings of 3 inbred lines of perennial ryegrass (Lolium perenne) and 4 lines of Italian ryegrass (L. multiflorum). The surviving plants developed as mixoploids and were self-pollinated. In the following generation (CT1) the seeds were grown without further treatment, and were screened cytologically at the seedling stage to separate out diploids from tetraploids. Only the diploids were kept, and in this CT1 generation comparisons were then made between controls (2x) and colchicine-treated diploids (C2x) for leaf mesophyll cell size and chloroplast number variation. Heritable differences were found such that the cell plan areas and/or the numbers of chloroplasts per cell were significantly greater in the C2x compared with the 2x treatment in 3 and 5 out of the 7 lines. In each case there was enhancement of chloroplast numbers independently of the variation in cell size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00037855
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  • 2
    Electronic Resource
    Electronic Resource
    Colchicine-induced heritable variation in cell size and chloroplast numbers in leaf mesophyll cells of diploid ryegrass (Lolium perenne L.) (1990)
    Springer
    Euphytica 49 (1990), S. 49-55 
    Details
    ISSN: 1573-5060
    Keywords: Lolium perenne ; ryegrass ; colchicine ; induced heritable variation ; cell size ; chloroplast number
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A 3 hr treatment period with a 0.2% aqueous solution of colchicine was given to one week old seedlings of imbred lines of perennial ryegrass (Lolium perenne L.). The surviving plants developed as mixoploids and were subsequently split down into single tillers and then classified as either diploid or tetraploid. The undoubled diploids of the treated material (C2x) were then self-pollinated and the seeds grown in the following generation (CT1) without any further treatment. In the CT1 generation comparisons were made between the C2x and the control 2x treatments within the same inbred lines, and heritable differences were found for leaf mesophyll cell plan areas and chloroplast numbers. The cell areas were significantly less in the C2x compared with the 2x treatment in four out of the five lines studied, and the chloroplasts numbers were likewise lower in two out of the five lines. In one line there was a significantly higher mean number of chloroplasts per cell in the C2x material compared with that of the 2x.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00024130
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Radiation-induced crosslinking of polyethylene in the presence of acetylene: A gel fraction, UV-visible, and ESR spectroscopy study (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 31 (1993), S. 807-819 
    Details
    ISSN: 0887-6266
    Keywords: polyethylene, polyene formation on irradiation with acetylene present in ; polyene formation in irradiation of polyethylene with acetylene present ; crosslinking in polyethylene irradiated with acetylene present ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Electron-spin resonance (ESR) and altraviolet (UV) visible spectroscopic evidence has been found for the formation of diene, triene and tetraene, following the irradiation of polyethylene in the presence of acetylene. The polyenes are formed by a mechanism which is different from that observed under vacuum or with inert gas saturation. The sum of the G (polyene) values obtained by UV spectroscopy is almost half that of initial radical formation. It is concluded that polyene bridges, predominantly diene, form crosslinks between radical pairs. G (X) values determined from gel fraction data, using Saito-Kang-Dole theory, are found to be greatly in error and misrepresentative of crosslink changes. © 1993 John Wiley & Sons, Inc.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1993.090310709
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  • 4
    Electronic Resource
    Electronic Resource
    An infrared spectroscopic study of changes in unsaturation resulting from irradiation of isotropic and uniaxially oriented polyethylene films in the presence of acetylene (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 32 (1994), S. 469-479 
    Details
    ISSN: 0887-6266
    Keywords: polyethylene ; acetylene ; FTIR ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Interchain bridges of unsaturated double bonds have been proposed to form in amorphous regions, when polyethylene is irradiated in the presence of acetylene. We have corroborated the formation of these bridges by infrared spectroscopic studies. The double bonds are composed mainly of trans-olefin and vinyl end groups, formed as a result of competing radical-radical termination and hydrogen atom abstraction reactions. The hydrogen atom abstraction reaction becomes insignificant in uniaxially oriented high-density polyethylene having a draw ratio of 7.5, because of the alignment and positioning of the initiating radical pairs. During in vacuo irradiation and annealing only in-chain trans-olefins are usually formed. © 1994 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1994.090320308
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  • 5
    Electronic Resource
    Electronic Resource
    A study of the transport properties of acetylene through a highly oriented polyethylene fiber (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 45 (1992), S. 819-826 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The transport properties of acetylene in a high modulus polyethylene fiber have been studied in detail over the temperature range of 25 to 65°C. Diffusion coefficients for the fiber are about four orders of magnitude lower than values cited for isotropic high density polyethylene. In keeping with this, a much higher apparent activation energy of diffusion (ca. 80.64 ± 0.53 kJ mol-1) was found. The solubility of acetylene in the fiber (ca. 0.158 cm3 C2H2 STP/cm3 PE @ 76 cm Hg), is lower, but of the same order of magnitude as that expected for isotropic polyethylene. The apparent heat of solution was determined, within experimental limits, to be zero. It is concluded that the acetylene is neither chemically nor physically absorbed onto the fiber, but freely diffuses, according to Fick's law, through the amorphous regions of the polymer.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1992.070450508
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  • 6
    Electronic Resource
    Electronic Resource
    Characterization of low Mr Zona Pellucida binding proteins from boar spermatozoa and seminal plasma (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Molecular Reproduction and Development 33 (1992), S. 108-115 
    Details
    ISSN: 1040-452X
    Keywords: Zona binding proteins ; Seminal plasma ; Fertilization ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: A group of low Mr (16 kDa - 23 kDa) glycoproteins on ejaculated boar spermatozoa have been shown to have high affinity for homologous zona pellucida glycoproteins (ZPGPs). These ZPGP binding proteins are derived from seminal plasma as shown by their absence from epididymal spermatozoa and their presence in seminal plasma as identified by N-terminal amino acid sequence analysis. They bind to ZPGPs by a polysulphate recognition mechanism similar to that found for proacrosin-ZPGP interactions. The haemagglutination activity of boar seminal plasma is also associated with these low Mr glycoproteins. It is suggested that they play a role in regulating the rate of sperm capacitation and survival in the female reproductive tract. © 1992 Wiley-Liss, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1080330115
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