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  • Chemistry  (3)
  • Barley genetics  (1)
  • 2005-2009
  • 1990-1994  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Quantitative phenotypical expression of three mutant genes in barley and the basis for defining an ideotype for Mediterranean environments (1990)
    Springer
    Theoretical and applied genetics 80 (1990), S. 762-768 
    Details
    ISSN: 1432-2242
    Keywords: Barley genetics ; Quantitative gene expression ; Ideotype ; Mutants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Three mutants induced in the two-rowed barley variety Beka and their three binary recombinants have been used in an attempt to define an ideotype suitable for Mediterranean agroclimatic conditions. Physiological methods (classical plant growth analysis) together with the study of genotype x environment interaction for grain yield were used to characterize the genotypes. That characterization brought out the huge phenotypical variation produced by only three mutant genes, suggesting that single Mendelian genes may alone explain the quantitative variation, including grain yield, without the necessity of using the polygenic concept. The genotype best adapted to the environments studied is later in heading and has shorter straw and denser spikes than Beka; it also has higher inverse of leaf area rate and grain: leaf area ratio, a lower rate of leaf senescence, and a shorter grain filling period than the original variety.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224189
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  • 2
    Electronic Resource
    Electronic Resource
    Surface-enhanced Raman spectroscopy of 1,5-dimethylcytosine on silver and copper sols (1990)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 21 (1990), S. 679-682 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Raman spectra of 1.5-dimethylcytosine (DMC) as the solid and in aqueous solution are reported. A tentative assignment of Raman bands is made. Surface-enhanced Raman spectra obtained on silver and on copper colloids show appreciable differences from the normal unenhanced Raman spectra. The geometry of DMC-metal interactions is discussed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250211008
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  • 3
    Electronic Resource
    Electronic Resource
    SERS of cytosine and its methylated derivatives on metal colloids (1992)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 23 (1992), S. 61-66 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: SERS spectra of cytosine, 1-methylcytosine, 5-methylcytosine and 1,5-dimethylcytosine on silver and on copper colloids are reported. A study of the influence of pH on the normal Raman spectra of these compounds was made in order to understand better the behaviour of these molecules on metal surfaces. The results obtained indicate remarkable changes in the type of adsorbate - metal interactions depending on the metal used as the SERS support. These interactions are also influenced by the presence of methyl groups in the cytosine molecule.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250230108
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  • 4
    Electronic Resource
    Electronic Resource
    Interactions of cytidine derivatives with metals as revealed by surface-enhanced Raman spectroscopy (1991)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 22 (1991), S. 819-824 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Surface-enhanced Raman spectra of cytidine and cytidine 5′-monophosphate adsorbed on copper and silver colloids were investigated. As an aid to the interpretation with regard to the metal-adsorbate binding sites, the normal Raman spectra of the complexes of these substances with the metal ions were also obtained. The adsorption of the cytosine moiety in these substances occurs preferentially through the carbonyl bond, the pyrimidine ring adopting a non-planar orientation on the surface. However, in the complexes involving the metal ions the N-3 position is found to be the site through which the base interacts with these metals. The ribofuranose ring does not seem to participate significantly in the interaction of these substances with copper and silver in either the colloidal or ionic states.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250221215
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