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  • 1
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Data on genetic polymorphism, scored at two morphological loci, showed peripheral, isolated roadside colonies of slender oat (Avena barbata) to be significantly less polymorphic than the large central populations in continuous stands. The role of random drift (founder effect) was evident in the genetic structure of such roadside colonies which were, however, not monomorphic. Multilocus associations also suggested large Hill-Robertson effect in generating gametic disequilibria. Such isolates with varying amounts of elapsed time since the founder events could offer useful material for a study of evolutionary processes including the selection-drift balance.
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  • 3
    ISSN: 1612-1112
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The problems of derivative gas chromatography of the alkanolamines have been discussed. It has been demonstrated that the difficulties of direct GC, inherent in the high adsorption affinity and strong retentive interaction of this class of compounds with silaceous supports and stationary liquids, can be overcome by using organic polymer beads, having weakly interacting surface. From a short column containing Tenax-GC under programmed temperature conditions, better than base line resolution of the three ethanolamines can be achieved in less than 8 minutes, as against about an hour by derivative GC and several hours by chemical methods, based on amine functionality. Elution properties, such as retention index and its temperature coefficient, have been determined on Tenax-GC for the ethanolamines. A boric acid precolumn is reported for the first time to completely subtract the alkanolamines. The relative response factors, which are required for precision analysis, have been found to make an interesting comparison for the ethanolamines and their derivatives. Under optimised PTGC conditions, a 4 ft Tenax-GC column has revealed the presence of six impurity peaks with fairly good resolution in a commercial sample of triethanolamine.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1612-1112
    Keywords: TLC studies of some ; 1,8 disubstituted triphenodioxazines ; using non-aqueous solvents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A thin-layer chromatographic method for the separation and identification of hitherto unknown disubstituted triphenodioxazines in submicrogram amounts has been developed using silica gel plates. The solvent systems used are acetone-petroleum ether (60∶40), benzene-petroleum ether (80∶20) and acetone-petroleum ether (50∶50). The compounds are detected by spraying the plates with 0.05 mol dm−3 sulphuric acid.
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  • 5
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Pre-column derivatisation ; Morpholine and degradation products ; Boiler feed water
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Morpholine and its amine-type thermal degradation products present in boiler feed water and steam condensate were derivatised with N-succinimidyl-p-nitrophenylacetate. These pre-column derivatives were determined by high-performance liquid chromatography with UV detection at 280 nm. The analytical column was Supelco-sil-ODS with an isocratic mobile phase. Morpholine and its breakdown products were monitored in the range 0.01–10 μg ml−1 with a relative standard deviation of 0.4–3.0%. Chromatographic analysis of boiler feed water and steam condensate samples collected from a boiler servicing a petroleum refinery is described.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Packed column separations ; C1−C4 alcohols ; Ethers ; Gasoline
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A number of oxygenated compounds such as C1−C4 alcohols, methyl tert-butyl ether (MTBE), and tertamyl methyl ether (TAME) are increasingly being used in gasoline as octane boosters and to reduce vehicular emissions. Monitoring of individual oxygenates in gasoline is important for quality control and regulatory purpose. Although, several analytical methods based on gas chromatography have been reported, a need was still felt to develop a simple and cost effective method of analysis. In this paper, a packed column gas chromatographic method is described for the analysis of C1−C4 alcohols, MTBE and TAME over a wide concentration range (2–20% V/V) in gasoline. The method involves determination of alcohols and ethers separately on two different columns. The alcohols are determined on a 20 ft column packed with poly(ethylene glycol) 400 as a stationary phase while the ethers are analysed on a 20 ft OPN-Poracil C column. The analysis of alcohols on poly(ethylene glycol) 400 column also provides data on aromatic components of gasoline.
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  • 7
    ISSN: 1612-1112
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The seoaration and identification of some substituted dianilino-3,6-dihalo-1,4-benzoquinones in submicrogram quantities on thin-layer of silica gel G using various nonaqueous developing solvent systems is reported. R F values are obtained with a reproducibility of ±0.02 units.
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  • 8
    ISSN: 1432-217X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Sociology , Economics
    Notes: Abstract A condition on preferences called strict Latin Square partial agreement is introduced and is shown to be necessary and sufficient for quasi-transitivity of the social weak preference relation generated by any special majority rule, under the assumption that individual preferences themselves are quasi-transitive.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Euphytica 11 (1962), S. 229-232 
    ISSN: 1573-5060
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract in the pedigree of a group of several intervarietal crosses in barley, individual plant progenies from F4 F5 and F6 generations were studied along with three of their parents for comparing the within-family variances (σ2 w) in them using it as a measure of progress towards homozygosity. For plant height the value of σw 2 in F6 was not significantly higher than the one in parents whereas for spike length there was observed a significant excess of within-family variability in F6 over the parents. This excess was attributed to a differential survival of heterozygous progenies under selection despite some selection pressure against the heterozygosity in marked chromosome segments. The adaptive role of heterozygote advantage in the populations of such predominantly self-fertilized species has been briefly discussed.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Euphytica 26 (1977), S. 441-450 
    ISSN: 1573-5060
    Keywords: Oryza sativa ; rice ; rice collections ; indica-japonica rice ; racial classification ; genetic diversity ; genetic resources
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A total of 1407 japonica and 488 indica accessions representing nine countries were randomly drawn from the International Rice Research Institute catalog of germ plasm resources for an analysis of diversity. The qualitative gene frequencies as well as means and coefficients of variation for quantitative traits for each race and country in general confirmed the widely recognized pattern of indica-japonica differentiation but suggested more overlap than often realized. Use of a diversity index showed indica to be more variable than japonica, but with different countries having similar levels of diversity. A multivariate analysis based on 39 characters showed divergence among countries within each race but with a great amount of overlap in the scatter of individual entries. This study was carried out simply to illustrate some genetic resource analyses and it is therefore discussed in relation to the documentation aspects.
    Type of Medium: Electronic Resource
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