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  • FT-Raman spectroscopy  (1)
  • Festuca pratensis  (1)
  • Springer  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Variation in forage grasses as hosts of the root-knot nematode Meloidogyne naasi (Franklin) and selection for resistance in ryegrass (1989)
    Springer
    Euphytica 43 (1989), S. 135-141 
    Details
    ISSN: 1573-5060
    Keywords: Lolium perenne ; perennial ryegrass ; L. multiflorum ; Italian ryegrass ; Festuca pratensis ; meadow fescue ; F. arundinacea ; tall fescue ; Festuca × Lolium hybrids ; Phleum pratense ; timothy ; Dactylis glomerata ; cocksfoot ; Meloidogyne naasi ; root-knot nematode ; resistance ; selection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Reactions of 13 grasses to Meloidogyne naasi varied with species; ryegrasses, fescues and their hybrids were generally susceptible and cocksfoot and timothy resistant. Marked variation in host resistance levels occurred between genotypes within cultivars. Selection of single plants, followed by tests on replicate tillers, identified resistant and susceptible genotypes in both Italian and perennial ryegrass cultivars. Resistant plants had few nematode-induced galls and fewer females and eggs than susceptibles. There was more or less continuous variation, with many genotypes intermediate between extremes of resistance and susceptibility. Selected resistant and susceptible genotypes are of use in assessing variation in nematode populations and as controls for breeding and selection programmes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00037906
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  • 2
    Electronic Resource
    Electronic Resource
    Particle Size Dependent Molecular Rearrangements During the Dehydration of Trehalose Dihydrate-In Situ FT-Raman Spectroscopy (1998)
    Springer
    Pharmaceutical research 15 (1998), S. 1207-1214 
    Details
    ISSN: 1573-904X
    Keywords: FT-Raman spectroscopy ; trehalose dihydrate ; dehydration ; crystalline ; amorphous
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Purpose. (1) To characterise the different phases of trehalose using FT-Raman spectroscopy. (2) To monitor the changes in the structure of trehalose dihydrate on isothermal heating at 80°C. Methods. Different phases of trehalose were prepared and FT-Raman spectra obtained. Trehalose dihydrate was sieved to 〈45 μm and 〉425 μm particle size fractions and FT-Raman spectra were obtained at various time intervals during heating at 80°C. Results. During heating at this temperature, the spectra of a 〈45 μm particle size fraction showed a loss of peak resolution with time and after 210 minutes resembled the spectrum of amorphous trehalose prepared by lyophilisation, indicating that the material was rendered amorphous by heating. In contrast, spectra obtained from a 〉425 μm particle size fraction altered with time and became characteristic of the crystalline anhydrate. The approximate kinetics of this transformation to the anhydrate were monitored by analysis of peak intensity ratios with time. A two stage rearrangement was indicated; some functional groups appeared to manoeuvre into the spatial arrangement found in the anhydrate initially before the rest of the ring structure relaxed into this conformation. This may be due to some parts of the molecule being immediately affected by the loss of the water molecules on dehydration prior to the subsequent reorientation of the entire molecule into the anhydrate crystal lattice. Conclusions. The 〈45 μm particle size fraction becomes disordered on dehydration induced by heating at 80°C whilst the 〉425 μm particle size fraction crystallises to the anhydrate under the same conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1011935723444
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