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  • Chemistry  (5)
  • Nodulation  (3)
  • Capillary electrophoresis
  • 1985-1989  (4)
  • 1980-1984  (4)
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Effect of gibberellins and the growth retardant CCC on the nodulation of soya (1984)
    Springer
    Plant and soil 77 (1984), S. 53-60 
    Details
    ISSN: 1573-5036
    Keywords: β-chloroethyltrimethylammonium chloride ; Gibberellins ; Nodulation ; Rhizobium japonicum ; Soya
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The effect of exogenous applications of gibberellins (GAs) or the growth retardant β-chloroethyltrimethylammonium chloride (CCC) on root nodule formation and activity (C2H2-reduction) in soya was studied. Daily foliar application of GA3 (2.89×10−6 M) delayed the formation of nodule initials and reduced the numbers mass nodule−1 and specific activity of nodules by 43%, 31% and 47% respectively, without affecting plant growth. Similar effects on nodulation were produced by foliar application of GA4 (3.01×10−5 M) or GA7 (3.03×10−5 M), or by the addition of GA3 (2.89×10−6 M) to the rooting medium. GA effectiveness in reducing nodule numbers was decreased by delaying its application until after the initial infection process had occurred, but the nodules formed were smaller and less active than those of the untreated control plants. The GA effect on nodulation and nodule activity was not associated with alterations in root exudate or due to a direct inhibitory effect of the hormone on the nitrogenase system. When the endogenous root content of GA-like substances was reduced (86% decrease) by foliar application of CCC (6.30×10−5 M), nodule numbers were increased by 56%, but nodule size and total nodule activity were similar to those of control plants. The GA and CCC treatments had no effect on rhizobial growth in liquid culture nor on root colonisation by rhizobia. The results suggest that the endogenous content of root GA may have a regulatory role in both the infection process and in subsequent nodule morphogenesis, thus controlling both the number and effectiveness of the root nodules formed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02182811
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  • 2
    Electronic Resource
    Electronic Resource
    The isolation of effective and ineffective mutants of cowpea rhizobium (1981)
    Springer
    Plant and soil 60 (1981), S. 349-356 
    Details
    ISSN: 1573-5036
    Keywords: Competition ; Cowpea ; Ineffective ; Mutagenesis ; Mutants ; Nodulation ; Rhizobium ; Symbiotic and asymbiotic nitrogen-fixation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A strain of cowpea Rhizobium was mutagenised and two ineffective mutants, M1 and M2, and an effective mutant, M3, were isolated. M1 produced more, but smaller nodules than the wild-type; these nodules lacked leghaemoglobin. M2 and the parental strain had similar nodulation characteristics, both forming large pink nodules. Plants inoculated with M3, nodulated earlier, produced more nodules (58%), had increased dry weights (26%) and the excised roots expressed greater acetylene (C2H2) reducing activity (39%) than plants inoculated with the wild-type. When competing with an indigenous population of effective rhizobia for nodule sites, M3 produced a higher proportion of the nodules (70–80%) than the parental strain (40–53%). M3 and the parental strain exhibited comparable rates of asymbiotic C2H2 reduction when grown on a defined medium, whereas M1 and M2 were inactive. The symbiotic properties of the mutants were unchanged after their reisolation following plant passage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02149631
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of osmotically induced leaf moisture stress on nodulation and nitrogenase activity ofGlycine max (1984)
    Springer
    Plant and soil 80 (1984), S. 267-283 
    Details
    ISSN: 1573-5036
    Keywords: Abscisic acid ; Gibberellin ; Polyethylene glycol ; Rhizobium ; Roots ; Nitrogenase ; Nodulation ; Soya ; Water stress
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The effect of 2-day cycles of osmotically induced leaf moisture stress followed by partial recovery on the nodulation and nitrogenase activity of 2 soya cultivars was studied. Fourteen days after plant inoculation (mid-growth stage) the total leaf electrochemical water potential (ψwleaf) of control plants ranged from −0.8 to −1.9 bars, whereas the concentrations of osmoticum (polyethylene glycol 4000) induced ψwleaf values ranging from −1.4 (recovery value) to −3.1 bars (low stress), −1.8 to −4.4 bars (mild stress), and −2.2 to −6.2 bars (medium stress). The low stress treatment reduced nodule numbers and their specific activity in both cultivars, without affecting nodule size or the time required for nodule initiation. Nodule initiation was delayed in both cultivars by the mild and medium stress treatments, the former treatment reducing the number and size of the nodules and such nodules exhibited very low specific activity. The medium stress treatment prevented the further development of nodule initials, which remained inactive throughout the experiment. Such results imply an effect of water stress on the infection process and on nodule morphogenesis. The reduction in nodule numbers observed in water stressed plants was not associated with a reduced number of rhizobia in the rhizoplane nor due to an effect on root growth or root hair formation. At a stage prior to the formation of macroscopic nodule initials, the roots of plants under medium stress (ψwleaf=−5.5 bar)s) had a higher content of abscisic acid (ABA) (4-fold increase) and a lower content of gibberellin (GA)-like substances (21.4% reduction) as compared to control plants (ψwleaf=−1.0 bar). Although the medium stress treatment slightly increased the stomatal resistance of leaves, photosynthetic and transpiration rates were unaffected. Similar alterations of the hormononal balance occurred in the nodulated roots of plants subjected to naturally induced leaf moisture stress. Since the foliar application of ABA (1.92×10−5 M) to unstressed plants inhibited nodulation (45% reduction in nodule numbers), the increased endogenous content of thishormone in the roots of plants under leaf moisture stress may provide some physiological insight into the inhibitory effect of water stress on the nodulation process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02161183
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  • 4
    Electronic Resource
    Electronic Resource
    Capillary GC analysis of diesel fuels using simultaneous parallel triple detection (1986)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 9 (1986), S. 39-43 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography, GC ; Fused silica capillary columns ; Parallel triple detection ; Diesel fuels ; Polyaromatic hydrocarbons ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Diesel fuels from different parts of the UK have been analyzed for polycyclic aromatic hydrocarbons (PAH), nitrogen-containing PAH, and sulfur-containing PAH using capillary column GC with simultaneous parallel triple detection. The concentrations of polyaromatic compounds (PAC) were high and showed considerable variability amongst the fuels. The PAH are mainly naphthalene, fluorene, and phenanthrene and their alkylated homologs; the PANH are mainly carbazole and its methyl derivatives; the PASH are mainly dibenzothiophene and its methyl derivatives.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240090107
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  • 5
    Electronic Resource
    Electronic Resource
    Compressibility effects in the optimization of serially connected gas chromatographic capillary columns by the window diagram technique (1983)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 6 (1983), S. 569-570 
    Details
    ISSN: 0935-6304
    Keywords: Serially coupled capillary columns ; Window diagram ; Optimization ; Compressibility ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240061009
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  • 6
    Electronic Resource
    Electronic Resource
    Accurate molecular weight distribution of polymers using thermal field-flow fractionation with deconvolution to remove system dispersion (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 37 (1989), S. 2059-2076 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Thermal field-flow fractionation (ThFFF) is an elution process that separates polymeric materials by molecular weight. Elution profiles thus provide approximations to the molecular weight distributions of polymers. The accuracy of such approximate distributions is expected to be improved by accounting for the effect on the elution profile of band-broadening processes in the FFF system. Fortunately this intrinsic band broadening, referred to as system dispersion, is theoretically well-defined in ThFFF. In this article we present an algorithm that corrects ThFFF elution profiles by removing system dispersion. The program is applied to ThFFF fractograms of standard polymers having both narrow and broad molecular weight distributions. The increased accuracy obtained by accounting for system dispersion is demonstrated. For the narrow standard, deconvolution shows that the polydispersity (weight/number-average mol. wt.) is only 1.004. For the broad standard, NBS 706, the molecular weight distribution and parameters obtained agree well with previously published results. Application to a simulated fractogram resulting from mixing five narrow standards helps define the conditions under which accurate molecular weight information can be recovered.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1989.070370725
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  • 7
    Electronic Resource
    Electronic Resource
    The status of reference data, reference materials and reference procedures in surface analysis (1988)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 13 (1988), S. 46-50 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A brief synopsis is given of recent developments and current needs for reference data, reference materials and reference procedures in surface analysis. This assessment is based largely on three presentations and related discussion at the Second Topical Conference on Quantitative Surface Analysis held at Monterey, California on 30-31 October, 1987. While a reasonable start has been made in recent years in providing needed data, materials, and procedures, many important needs remain.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740130110
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  • 8
    Electronic Resource
    Electronic Resource
    High speed separation of ultra-high-molecular-weight polymers by thermal/hyperlayer field-flow fractionation (1988)
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 9 (1988), S. 817-823 
    Details
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1988.030091207
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