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  • Lycopersicon esculentum  (4)
  • crystal structure  (4)
  • Springer  (8)
  • American Chemical Society
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  • Springer  (8)
  • American Chemical Society
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  • 1
    Digitale Medien
    Digitale Medien
    Synthesis, characterization, and crystal structure of 1,3,7,9-tetramethylpyrido-[2,3-d∶6,5-d′]-dipyrimidine-2,4,6,8-tetrone (1994)
    Springer
    Journal of chemical crystallography 24 (1994), S. 465-468 
    Details
    ISSN: 1572-8854
    Schlagwort(e): Pyrimidine ; uracil ; crystal structure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract A new and easy method for the preparation of 1,3,7,9-tetramethylpyrido-[2,3-d∶6,5-d′]-dipyrimidine-2,4,6,8-tetrone is described. The structure of this compound has been solved by means of X-ray diffraction methods. The chemical characterization by spectral (mass, ultraviolet, infrared, and proton nuclear magnetic resonance) and thermal (thermogravimetry and differential scanning calorimetry) method is also reported. The compound is monoclinic, space groupP21/c,a=12.720(5),b=13.688(7),c=8.079(2) Å, β=107.06(4)°,Z=4. The structure consists of discrete tricyclic molecules, stacking playing an important role in crystal packing.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01666096
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  • 2
    Digitale Medien
    Digitale Medien
    The crystal and molecular structure of mercury(II) bis(isopropyl)dithiophosphate, Hg[S2P(OPri)2]2, revisited: new comments about its supramolecular self-organization (1999)
    Springer
    Journal of chemical crystallography 29 (1999), S. 831-836 
    Details
    ISSN: 1572-8854
    Schlagwort(e): Hg coordination ; crystal structure ; organomercury derivatives
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract The crystal structure of the title compound, Hg[S2P(OPri)2]2, has been determined by single-crystal X-ray diffraction. The compound crystallizes in the centrosymmetric P21/c space group with a = 11.800(1), b = 8.925(2), c = 22.167(2) Å, β = 94.988(7)°, and Z = 4. The same compound has been previously reported but the structure is described there in the space group C2/c. In both cases, one phosphorodithioate moiety acts as a chelating group and the other as a bridging group between neighboring mercury atoms (related to one another by the twofold screw axis), giving rise to an infinite polymer along the direction of the b axis. It turns out that in spite of the difference in space group symmetry, the structures are remarkable similar in that they are formed from infinite polymers of similar geometry. The coordination around the Hg ion shows, however, significant differences, mainly for the bridging Hg—S(4) bond length, which is 0.16 Å smaller than that previously reported.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1009508122842
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  • 3
    Digitale Medien
    Digitale Medien
    The crystal and molecular structure of 2-S-methylthiouracil (1999)
    Springer
    Journal of chemical crystallography 29 (1999), S. 725-727 
    Details
    ISSN: 1572-8854
    Schlagwort(e): 2-thiouracil derivatives ; crystal structure ; S-methyl-thiouracil ; hydrogen bonding ; structural methylation and metallation effects
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract 2-S-Methylthiouracil crystallizes in the triclinic space group P $${\bar 1}$$ with unit cell dimensions a = 5.508(4), b = 7.175(3), c = 8.522(2) Å, α = 80.83(2), β = 80.43(3), γ = 76.86(3)°, and Z = 2. The molecule exists in the crystal in the lactam form and is essentially planar. The molecular packing consists of molecules linked in centrosymmetric hydrogen-bonded pairs. The effects of methylation and subsequent metallation on the 2-thiouracil structure are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1009588223827
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  • 4
    Digitale Medien
    Digitale Medien
    X-ray crystal structure of tetraaquabis (xanthosinato)nickel(II) hexahydrate (1999)
    Springer
    Journal of chemical crystallography 29 (1999), S. 1009-1013 
    Details
    ISSN: 1572-8854
    Schlagwort(e): crystal structure ; nickel complex ; xanthosine
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract The complex [Ni(XsH−1)2(H2O)4]·6H2O (XsH−1: xanthosinate) was isolated from the reaction of nickel carbonate with xanthosine in aqueous solution. The octahedral coordination is supported by the reflectance measurements. Single-crystal X-ray diffraction studies show that the crystals belong to the triclinic P1 space group, with a = 7.152(1), b = 8.830(1),c = 13.783(1) Å, α = 82.024(1)°, β = 86.155(1)°, γ = 70.900(1)°, and D = 1.643 mg/m3, forZ = 1. Nickel is six coordinate with four water molecules, and two N7 atoms from xanthosinato ligands. A complicated hydrogen-bonding network is present, all possible donors taking part in it.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1009568616134
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  • 5
    Digitale Medien
    Digitale Medien
    Molecular characterization of glyoxalase-I from a higher plant; upregulation by stress (1995)
    Springer
    Plant molecular biology 29 (1995), S. 1223-1233 
    Details
    ISSN: 1573-5028
    Schlagwort(e): expression pattern ; glyoxalase-I ; Lycopersicon esculentum ; phloem ; sequence ; salt-stress
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract A cDNA, GLX1, encoding glyoxalase-I was isolated by differential screening of salt-induced genes in tomato. Glyoxalases-I and-II are ubiquitous enzymes whose functions are not clearly understood. They may serve to detoxify methylglyoxal produced from triosephosphates in all cells. The protein encoded by GLX1 shared 49.4% and 58.5% identity with glyoxalase-I isolated from bacteria and human, respectively. Furthermore, yeast cells expressing GLX1 showed a glyoxalase-I specific activity 20-fold higher than non-transformed cells. Both GLX1 mRNA and glyoxalase-I polypeptide levels increased 2- to 3-fold in roots, stems and leaves of plants treated with either NaCl, mannitol, or abscisic acid. Immunohistochemical localization indicated that glyoxalase-I was expressed in all cell types, with preferential accumulation in phloem sieve elements. This expression pattern was not appreciably altered by salt-stress. We suggest that the increased expression of glyoxalase-I may be linked to a higher demand for ATP generation and to enhanced glycolysis in salt-stressed plants.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00020464
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  • 6
    Digitale Medien
    Digitale Medien
    Mercurialis ambigua and Solanum luteum: Two Newly Discovered Natural Hosts of Tomato Yellow Leaf Curl Geminiviruses (2000)
    Springer
    European journal of plant pathology 106 (2000), S. 391-394 
    Details
    ISSN: 1573-8469
    Schlagwort(e): Bemisia tabaci ; Datura stramonium ; epidemiology ; Lycopersicon esculentum ; Solanum nigrum ; TYLCV
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract The yellow leaf curl disease of tomato is caused by a complex of virus species, two of which, tomato yellow leaf curl virus (TYLCV)-Sar and TYLCV-Is, are involved in epidemics of southern Spain. Plants of Mercurialis ambigua and Solanum luteum showing abnormal upward leaf curling and leaf distortion collected in the vicinity of tomato crops were found to be naturally infected with TYLCV-Is and TYLCV-Sar, respectively. These weed species, as well as Datura stramonium and S. nigrum, which had also been found to be naturally infected by TYLCVs in the same region in previous studies, were tested for susceptibility to TYLCV-Sar or TYLCV-Is by Agrobacterium tumefaciens-mediated and by Bemisia tabaci inoculation. Results indicated that both TYLCV-Sar and TYLCV-Is were able to infect D. stramonium and M. ambigua, whereas only TYLCV-Sar infected S. nigrum and S. luteum. Implications for the epidemiology of TYLCV are discussed. This is the first report of M.ambigua and S. luteum as hosts of TYLCV.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1008758622582
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  • 7
    Digitale Medien
    Digitale Medien
    Growth and osmotic adjustment of two tomato cultivars during and after saline stress (1994)
    Springer
    Plant and soil 166 (1994), S. 75-82 
    Details
    ISSN: 1573-5036
    Schlagwort(e): growth ; osmotic adjustment ; saline stress ; solutes ; Lycopersicon esculentum
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract The effect of a short period of saline stress was studied in two phenotypically different cultivars, one of normal fruit-size (L. esculentum cv. New Yorker) and one of cherry fruit-size (L. esculentum var.cerasiforme cv. PE-62). In both cultivars the relative growth rate (RGR) and the leaf area ratio (LAR) decreased following salinisation. The leaf turgor potential (ψp) and the osmotic potential at full turgor (ψos) decreased to the same extent in both cultivars. However, the contributions of organic and inorganic solutes to the osmotic adjustment was different between cultivars. New Yorker achieved the osmotic adjustment by means of the Cl− and Na+ uptake from the substrate, and by synthesis of organic solutes. In the cherry cultivar organic solutes did not contribute to the osmotic adjustment, instead, their contribution decreased after salinisation. After the salt stress was removed, the water stress disappeared, the content of organic solutes decreased in plants of both cultivars and, therefore, their growth was not retarded by the diversion of resources for the synthesis of organic solutes. However, the toxic effects of the Cl− and Na+ did not disappear after removal of the salt stress, and the net assimilation rate (NAR) and the rate of growth (RGR) did not recover.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02185483
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  • 8
    Digitale Medien
    Digitale Medien
    Water Stress Induced Changes in Anatomy of Tomato Leaf Epidermes (2000)
    Springer
    Biologia plantarum 43 (2000), S. 275-277 
    Details
    ISSN: 1573-8264
    Schlagwort(e): epidermal cell length and width ; Lycopersicon esculentum ; stomata density and length ; trichome density
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Anatomical changes of leaf epidermes of tomato plants (Lycopersicon esculentum Mill. cv. INCA 9) submitted to water stress in the preflowering stage were studied. 20 d after germination, plants were subjected to three treatments: 1) 100 % of evapotranspired water was applied every day, 2) from 100 up to 10 % of evapotranspired water was applied every day, and 3) water supply was completely suppressed. Trichome density was similar in apical, middle and basal zones, and adaxial and abaxial leaf surfaces. Stomatal density and length, and epidermal cell length and width had similar values on the same leaf surface, but the values were higher on the abaxial than on the adaxial leaf surface. The water deficit had little effect on number of trichomes, length and width of epidermal cells and length of stomata, and decreased the stomatal density especially on adaxial surface.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1002716629802
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