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  • 1
    Electronic Resource
    Electronic Resource
    Sex expression, sex change and fruiting habit in anAcer rufinerve population (1995)
    Springer
    Ecological research 10 (1995), S. 65-74 
    Details
    ISSN: 1440-1703
    Keywords: male-bias ; reproductive cost ; resource allocation ; sex differential mortality ; successional stage
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Three hundred and thirty-eight plants ofAcer rufinerve Sieb. et Zucc. were monitored in a secondary deciduous forest for 5 years in terms of their sex expression and fruiting habit. Two types of flowers, functionally male and female, were recognized. The adult population consisted of constant males, inconstants and constant females. Constant males, plants that bore exclusively male flowers throughout the study period, accounted for 87% of the adult population. Thirty-four inconstant plants (11%) changed their sex in various ways. Constant females which accounted for only 2% of the population, were significantly smaller plants than the other two morphs, and suffered greater mortality. Fruit set was consistent and generally high for plants bearing female flowers. Thirteen juvenile plants out of 17 began reproduction during the 5 years, and all became male. For inconstant plants, fluctuation in sex expression tended to be more frequent and/or greater in magnitude for smaller plants. However, there was no evidence of the directional sex transition predicted by the size advantage hypothesis. Plant health and the successional stage of the stand should be taken into account as well as resource allocation problems to explain the proximate mechanisms of sex expression.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02347656
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  • 2
    Electronic Resource
    Electronic Resource
    FXIIIA polymorphism in a Japanese population: Occurrence of FXIIIA*4 allele (1986)
    Weinheim : Wiley-Blackwell
    Electrophoresis 7 (1986), S. 289-290 
    Details
    ISSN: 0173-0835
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: The FXIIIA polymorphism was studied in a Japanese population using agarose gel isoelectric focusing and agarose gel electrophoresis, combined with immunoblotting onto nitrocellulose membranes. The correspondence of patterns between the two methods was confirmed by two-dimensional electrophoresis. A rare phenotype, FXIIIA 4-1, was detected in one individual besides the three common phenotypes FXIIIA 1, 2-1, and 2. This rare phenotype was identified with the originally reported FXIIIA 4-1 in Melanesians. Our results indicate the possibility that the FXIIIA*4 allele may be distributed widely in world populations.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.1150070609
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  • 3
    Electronic Resource
    Electronic Resource
    Hydrogenated Hydroxy-Terminated Polyisoprene as a Fuel Binder for composite solid propellants (1996)
    Weinheim : Wiley-Blackwell
    Propellants, Explosives, Pyrotechnics 21 (1996), S. 43-50 
    Details
    ISSN: 0721-3115
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The synthesis and application of hydrogenated hydroxy-terminated polyisoprene (HHTPI) to a fuel binder of composite solid propellants were attempted. An HHTPI prepolymer was synthesized through the hydrogenation for the hydroxy-terminated polyisoprene (HTPI) in the presence of nickel and zirconium catalysts over kieselguhr in 2.0 MPa hydrogen and at 443 K - 453 K for 24h. A prepolymer of a number-averaged molecular weight 2500-3800, provided a viscosity level required for the use of a fuel binder from which solid propellant can be possibly made by means of direct casting method. Thermal stability and aging characteristics of HHTPI elastomer against environmental attacks are superior to those of HTPB. Some plasticizers and bonding agents can bring about the acceptable mechanical properties to the propellant grains mainly composed of HHTPI, ammonium perchlorate and aluminium powder. The linear burning rates of HHTPI-based propellants are at the same level with that of HTPB-based propellants. However, the composition that gives the maximum performance with HHTPI-based propellants, shifts to 1-2 wt% fuel-rich side from the most adequate fuel content 12 wt% in HTPB/AP/Al. The HHPTI propellants indicated the similar burning rate as HTPB-based propellants in the linear burning rates in spite of the comparatively poor ignitability. Nevertheless, the static tests of 100 mm dia. sounding rocket motors are successfully performed by an ignition operation at the pressurized condition. The ballistic performances are not inferior to those of the HTPB-based propellants.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prep.19960210110
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