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  • 1
    Electronic Resource
    Electronic Resource
    Chromosome number and flavonoid synthesis in Briza L. (Gramineae) (1976)
    Springer
    Biochemical genetics 14 (1976), S. 897-904 
    Details
    ISSN: 1573-4927
    Keywords: polyploidy ; flavonoid synthesis ; flavone C-glycosides ; aneuploids ; Gramineae ; Briza
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Following a recent reidentification of the apigenin C-glycosides in diploid Briza media, the luteolin C-glycosides were reexamined and three acylated derivatives of a luteolin C-glycoside were found. In an attempt to identify the chromosome or group of chromosomes responsible for the change in flavonoid synthesis from 4′-hydroxy- in diploid plants to 3′,4′-dihydroxyflavone C-glycosides in autotetraploid plants, leaf flavonoids of artificially produced aneuploids of B. media were examined. Among these plants three different leaf flavonoid profiles were recognized: diploid, tetraploid, and a “modified” tetraploid pattern. All the aneuploids with the normal or “modified” tetraploid pattern were trisomic for one of the small acrocentric chromosomes. Induced polyploids of other Briza species were usually found to have similar flavonoid patterns in the two chromosome races. Flavonoid sulfates were found in three South American species but are absent from all the European species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00485122
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  • 2
    Electronic Resource
    Electronic Resource
    Measuring Turbidity in a Near-Critical, Liquid–Liquid System: A Precise, Automated Experiment (1999)
    Springer
    International journal of thermophysics 20 (1999), S. 877-887 
    Details
    ISSN: 1572-9567
    Keywords: liquid–liquid equilibria ; critical state ; experimental method ; turbidity ; methanol ; cyclohexane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A ground based (1g) experiment is in progress that measures the turbidity of the density-matched, binary fluid mixture methanol–cyclohexane extremely close to its liquid–liquid critical point. By covering the range of reduced temperatures t ≡ (T−T c)/T c from 10−8 to 10−2, the turbidity measurements should allow the Green–Fisher critical exponent η to be determined. This paper reports measurements showing ±0.1 % precision of the transmitted and reference intensities, and ±4μK temperature control near the critical temperature of 320 K. Preliminary turbidity data show a nonzero η consistent with theoretical predictions. No experiment has precisely determined a value of the critical exponent η, yet its value is significant to theorists in critical phenomena. Relatively simple critical phenomena, as in the liquid–liquid system studied here, serve as model systems for more complex behavior near a critical point.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022687219993
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