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  • Citric acid  (1)
  • betaines  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Metal-hydroxycarboxylate interactions: syntheses and structures of K2[VO2(C6H6O7)]2·4H2O and (NH4)2[VO2(C6H6O7)]2·2H2O (1995)
    Springer
    Journal of chemical crystallography 25 (1995), S. 807-811 
    Details
    ISSN: 1572-8854
    Keywords: Citric acid ; citrate complex ; oxovanadium(V) complex ; vanadate ; molecular structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Potassium and ammonium dimeric (citrato)dioxovanadium(V) hydrate K2[VO2(H2cit)]2·4H2O1 and (NH4)2[VO2(H2cit)]2·2H2O2 (H4cit=citric acid) have been prepared and characterized by X-ray structure analyses. Vanadate1 crystallizes in the monoclinic space groupP21/n (No. 14) with unit cell parameters:a=9.304(2),b=11.756(2),c=11.911(2)Å, β=111.72(3)°, andD c=1.911 g/cm3,Z=2; Vanadate2 also crystallizes in the monoclinic space groupP21/n with unit cell parameters:a=9.719(2),b=11.111(3),c=11.294(2)Å, β=109.03(2)°, andD c=1.781 g/cm3,Z=2. Each dimer contains a centro-symmetric planar four-member V2O2 ring with two exocyclic citrate entities coordinated by the oxygen atoms of the hydroxy-and α-carboxylate ligands, while the other two β-carboxylate groups remain uncomplexed. Principal dimensions of the V−O bonds are 1.986(4)av (hydroxy) and 1.980(3)Å(α-carboxyl) for vanadate1, 1.988(2)av (hydroxy) and 1.974(3)Å(α-carboxyl) for vanadate2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01671075
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Enhanced leaf chlorophyll levels in plants treated with seaweed extract (1996)
    Springer
    Journal of applied phycology 8 (1996), S. 535-543 
    Details
    ISSN: 1573-5176
    Keywords: Ascophyllum nodosum ; betaines ; commercial seaweed extract ; leaf chlorophyll ; soil application
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Application to the soil of an aqueous alkaline extract ofAscophyllum nodosum resulted in higher concentrations of chlorophyll in the leaves of treated plants in comparison to control plants treated with an equivalent volume of water. Positive results were obtained with all species tested (tomato, dwarf French bean, wheat, barley, maize). When the seaweed extract was applied as a foliar spray, similar effects on leaf chlorophyll contents were obtained, except in the case of dwarf French bean plants, for which no significant difference was recorded between test and control plants. When the betaines present in the seaweed extract were applied as a mixture in the same concentrations as those in the diluted seaweed extract (γ-aminobutyric acid betaine 0.96 mg L−1, δ-aminovaleric acid betaine 0.43 mg L−1, glycinebetaine 0.34 mg L−1), very similar leaf chlorophyll levels were recorded for the seaweed extract and betaine treated plants. This suggests strongly that the enhanced leaf chlorophyll content of plants treated with seaweed extract is dependent on the betaines present.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02186333
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    Paper (German National Licenses)
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