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  • gibberellin  (3)
  • EXAFS  (2)
  • abscisic acid  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Scientia Horticulturae 27 (1985), S. 63-73 
    ISSN: 0304-4238
    Keywords: Prunus persica ; abscisic acid ; benzylamino purine ; dormancy ; gibberellin ; rest
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1572-879X
    Keywords: EXAFS ; molybdenum sulfide ; catalyst dispersion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The dispersion of molybdenum sulfide catalysts was characterized based on the lateral dimensions of MoS2 crystallites estimated by EXAFS. A new index ofN(Mo)/N(S), instead ofN(Mo), was used to estimate the average MoS2 size to minimize the contribution of the coexisting oxide or oxisulfide phase in the catalysts. EXAFS showed some advantages over other techniques, such as TEM or XPS.
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  • 3
    ISSN: 1572-879X
    Keywords: Nitrogen monoxide decomposition ; zeolite ; copper ion-exchanged ZSM-5 ; XANES ; EXAFS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract XANES and EXAFS analysis of Cu ion-exchanged ZSM-5 zeolite, a highly active catalyst for NO decomposition, is performed. The copper species in the zeolite are Cu(II) ions in the zeolite cages. The contribution of Cu-Cu local structure is suggested for high loading samples. The Cu atoms in the zeolite are more ionic than CuO. The analysis of the catalyst deactivated by SOx treatment suggests the presence of Cu atoms surrounded by SO4 ions which blocks the adsorption of NO molecules.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1573-5087
    Keywords: abscisic acid ; Allium wakegi Araki ; bulb dormancy ; fluridone ; photoperiod
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Allium wakegi plants exposed to long days (LD, 14 h-photoperiod) developed bulbs, which were dormant from the 30th to the 125th day of LD, but those grown under natural short days (SD) did not develop bulbs. The contents of abscisic acid (ABA) in both whole bulbs and buds of the bulbs increased in LD, reaching a maximum at the 60th day of LD and decreasing thereafter, but those in basal leaf sheaths (this part corresponds to a bulb after bulb development) and buds did not increase in SD. The ABA content was related to the depth of bulb dormancy. Application of 500 μM ABA to bulbs for 24 h significantly delayed sprouting, but that of 5 or 50 μM ABA had little or no effect. Application of 25 or 125 μM fluridone to the soil just before exposure to LD bleached new expanding leaves and reduced bulb size, but had no effect on the development of bulb scales that characterize bulb formation. The bulbs formed under such conditions sprouted earlier than those of control plants. The levels of endogenous ABA in bulbs, buds of the bulbs, leaf blades, and roots were reduced by fluridone application. These results indicate that ABA plays an important role in bulb dormancy of Allium wakegi.
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  • 5
    ISSN: 1573-5087
    Keywords: flowering ; gibberellin ; Raphanus sativus L. ; stem elongation ; uniconazole ; vernalization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The effects of gibberellin (GA) on cold-induced stem elongation and flowering of Japanese radish (Raphanus sativus L.) were investigated using application of GA3 and a GA-biosynthesis inhibitor, uniconazole (UCZ). UCZ very strongly inhibited stem elongation and delayed flowering, and the inhibition and delay were completely reversed by GA3 application. These results suggest that GA is necessary not only in the stem elongation but also in the flowering. When cold treatment (CT) was conducted on the plants whose GA level was lowered by UCZ, GA3 applied after CT completely reversed the delay of flowering. Thus low GA level probably did not retard cold induction. Microscopic observation of apical meristem showed that UCZ delayed flowering by delaying the shift from vegetative to dome-shaped meristem. This result suggested that low GA level delayed floral evocation. Consequently it was suggested that low GA level retarded physiological process involved in long day induction or in floral evocation, resulting in delay of floral evocation.
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  • 6
    ISSN: 1573-5087
    Keywords: bioassay ; gibberellin ; 3β-hydroxylated gibberellin ; Oryza sativa L. ; prohexadione ; uniconazole
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A very sensitive and specific bioassay using prohexadione calcium [BX-112, which blocks 2β- and 3β-hydroxylation of gibberellins (GAs)] with uniconazole (which blocks oxidation of ent-kaurene, ent-kaurenol and ent-kaurenal) in a microdrop assay was developed for several rice (Oryza sativa L.) varieties, including cv. Waito-C, which is already specific to 3β-hydroxylated GAs. The sensitivity and specificity of cvs. Waito-C, Tan-ginbozu and Koshihikari to 3β-hydroxylated GAs was greatly enhanced by treatment of the seeds with a combination of 40 mM prohexadione calcium and 80 μM uniconazole. The minimum detectable doses of 3β-hydroxylated GAs (GA1, GA3, GA4 and GA7) in the three cultivars treated with both chemicals were 1 to 10 fmol (i.e. ca. 350 fg to 3.5 pg) per plant. This is equal to 30-fold more sensitive than Waito-C treated with uniconazole alone, and 30 to 1000-fold more sensitive than Waito-C with no growth retardant soak. Minimum detectable doses of 3-nonhydroxylated GAs (GA9, GA19 GA20) and GAs with very low biological activity (GA8 and GA17) were equal to or more than 1000 fmol per plant. This is about equal to the activity in Waito-C treated with uniconazole alone. Application of this assay to an extract from Raphanus sativus was compared with the data by gas chromatography/mass spectrometry (GC/MS), confirming the conclusions reached using authentic test GAs, namely that use of uniconazole plus BX-112 appreciably enhanced the detection sensitivity to fractions shown by GC/MS to contain GA1 and GA4, both 3β-hydroxylated GAs.
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