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  • low temperature crystal structure  (5)
  • Triticum aestivum  (4)
  • Springer  (9)
  • Public Library of Science
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  • Springer  (9)
  • Public Library of Science
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  • 1
    Electronic Resource
    Electronic Resource
    Dosage effects of chromosomes of homoeologous groups 1 and 6 upon bread-making quality in hexaploid wheat (1990)
    Springer
    Theoretical and applied genetics 80 (1990), S. 281-287 
    Details
    ISSN: 1432-2242
    Keywords: Triticum aestivum ; Glutenin ; Gliadin ; Aneuploid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The endosperm storage proteins, glutenin and gliadin, are major determinants of bread-making quality in hexaploid wheat. Genes encoding them are located on chromosomes of homoeologous groups 1 and 6. Aneuploid lines of these groups in spring wheat cultivar ‘Chinese Spring’ have been used to investigate the effect of varying the dosage of chromosomes and chromosome arms upon bread-making quality, where quality has been assessed using the SDS-sedimentation test. Differences between the group 1 chromosomes for quality were greater than those between the group 6 chromosomes. The chromosomes were ranked within homoeologous groups for their effect on quality as follows (〉=better quality): 1D〉1B〉1A and 6A〉6B=6D. The relationship of chromosome dosage with quality was principally linear for four of the chromosomes, but not for 6B and 6D. Increases in the dosage of 1B, 6A and, especially, 1D, were associated with significant improvements in quality, whereas increases in the dosage of 1A were associated with reductions in quality. The effects of 1A and 1D were such that the best genotype for quality was nullisomic 1A-tetrasomic 1D. For group 1, effects of the long arm appeared in general to be more important than effects of the short arm. For group 6, effects were found associated with the long arms as well as with the short arms, a surprising result in view of the absence of genes encoding storage proteins on the long arms. Significant interactions were found between chromosomes and genetic backgrounds, and between individual chromosomes. Analysis of trials grown over two years demonstrated that, although additive environmental differences over years and genotype x years interaction were present, they were relatively small in magnitude compared with purely genetic differences.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224399
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  • 2
    Electronic Resource
    Electronic Resource
    The high-molecular-weight glutenin subunit composition of Soviet wheat varieties (1990)
    Springer
    Euphytica 51 (1990), S. 41-52 
    Details
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; bread wheat ; bread-making quality ; endosperm storage protein ; genetics ; wheat breeding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary One hundred and twenty-eight wheat varieties bred in the Soviet Union were screened for the composition of high-molecular-weight (HMW) subunits of glutenin. In general, variability was low compared to that seen in varieties from other countries. However, varieties from different regions showed distinctive patterns, in some cases clearly due to the use of particular parents in certain breeding programmes, but in others possibly due to the adaptive value of particular alleles to the environmental conditions under which the varieties were bred. For example, among spring varieties, the Glu-D1 allele encoding subunits 2+12 was more common in varieties from areas with limited rainfall than was the allele encoding subunits 5+10. The pattern of HMW glutenin subunits amongst varieties with superior bread-making quality showed few differences from that amongst bread-making varieties of lower quality.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00022891
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  • 3
    Electronic Resource
    Electronic Resource
    Neutral solvent/crown ether interactions 3. Reorientation of the hydrogen bonds in the low temperature (−150°C) structure of 18-crown-6·2(CH3NO2) (1987)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 5 (1987), S. 631-638 
    Details
    ISSN: 1573-1111
    Keywords: 18-crown-6, nitromethane ; solvent complex ; low temperature crystal structure ; C-H acidic hydrogen bonding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The title complex was crystallized from a saturated solution of 18-crown-6 in nitromethane at 5°C and cooled to −150°C prior to X-ray diffraction data collection. At −150° C 18-crown-6·2(CH3NO2) is monoclinic,P21/n witha=9.290(2),b=7.864(6),c=13.627(8) Å, β=1000.84(4)° andD calc=1.31 g cm−3 for Z=2. Leastsquares refinement using 1521 independent observed reflections [F o≥5σ(F o)] led to a final conventionalR value of 0.041. The complex at −150°C is isostructural with its room temperature structure with the exception of the orientation of the methyl hydrogen atoms and their crown ether oxygen interactions. The methyl group hydrogen atoms were fully refined isotropically. The crown ether resides around a center of inversion and hasD 3d symmetry. There is one methyl hydrogen...crown interaction at 2.35(3) Å, one apparently bifurcated hydrogen bond utilizing a second methyl hydrogen atom (2.55(3), 2.65(3) Å) and the third hydrogen atom is actually directed away from the crown ring (closest H...O contact=2.67(3) Å).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00663004
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  • 4
    Electronic Resource
    Electronic Resource
    f-Element/crown ether complexes, 11. Preparation and structural characterization of [UO2(OH2)5] [ClO4]2·3(15-crown-5)·CH3CN and [UO2(OH2)5] [ClO4]2·2(18-crown-6)·2 CH3CN·H2O (1987)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 5 (1987), S. 645-658 
    Details
    ISSN: 1573-1111
    Keywords: 15-crown-5 ; 18-crown-6 ; hydrogen bonding ; uranyl perchlorate ; low temperature crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The reaction of UO2(ClO4)·nH2O with 15-crown-5 and 18-crown-6 in acetonitrile yielded the title complexes. [UO2(OH2)5] [ClO4]2·3(15-crown-5)·CH3CN crystallizes in the triclinic space groupPT with (at−150°C)a=8.288(6),b=12.874(7),c=24.678(7) Å, α=82.62(4), β=76.06(5), γ=81.06(5)°, andD calc=1.67 g cm−3 forZ=2 formula units. Least-squares refinement using 6248 independent observed reflections [F o≥5σ(F o)] led toR=0.111. [UO2(OH2)5] [ClO4]2·2(18-crown-6)·2CH3CN·H2O is orthorhombicP212121 with (at−150 °C)a=12.280(2),b=17.311(7),c=22.056(3) Å,D calc=1.68 g cm−3,Z=4, andR=0.032 (3777 observed reflections). In each complex the crown ether molecules are hydrogen bonded to the water molecules of the pentagonal bipyramidal [UO2(OH2)5]2+ ions, each crown ether having exclusive use of two hydrogen atoms from one water molecule and one hydrogen from another water molecule. In the 15-crown-5 complex the remaining hydrogen bonding interaction is between one of the water molecules and one of the perchlorate anions. The solvent molecule has a close contact between the methyl group and a perchlorate anion suggesting a weak interaction. There are a total of three U-OH...OClO3 hydrogen bonds to the two perchlorate anions in [UO2(OH2)5] [ClO4]2·(18-crown-6)·2CH3CN ·H2O. The remaining coordinated water hydrogen bond is to the uncoordinated 2H2O molecule, which in turn is hydrogen bonded to a perchlorate oxygen atom and an acetonitrile nitrogen atom. One solvent methyl group interacts with an anion, the other with one of the 18-crown-6 molecules. Unlike the 15-crown-5 structure, the hydrogen bonding in this complex results in a polymeric network with formula units joined by hydrogen bonds from one of the solvent molecules and the uncoordinated water molecule.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00663006
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  • 5
    Electronic Resource
    Electronic Resource
    Neutral solvent/crown ether interactions, 4. Crystallization and low temperature (−150°C) structural characterization of 18-crown-6 · 2(CH3CN) (1988)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 6 (1988), S. 65-71 
    Details
    ISSN: 1573-1111
    Keywords: 18-Crown-6 ; C−H acidic hydrogen bonds ; acetonitrile ; low temperature crystal structure ; solvent complex
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The crystal structure of 18-crown-6 · 2(CH3CN) has been determined via data collection at −150°C. The structure consists of two crown molecules each hydrogen bonded to two acetonitrile moieties in the asymmetric unit, each residing around a center of inversion. The crown ethers display their fullD 3d symmetry; methyl ... O contacts range from 3.189(8) to 3.598(8) Å. There are no close contacts indicative of any interaction between the crown/2(CH3CN) units.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00659370
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  • 6
    Electronic Resource
    Electronic Resource
    Neutral molecule/crown ether interactions 5. Comparison of the C−H acidic interactions of nitromethane and acetonitrile with 18-crown-6 and dibenzo-18-crown-6. Crystal structures of dibenzo-18-crown-6·2 CH3NO2 and dibenzo-18-crown-6·2 CH3CN (1988)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 6 (1988), S. 629-645 
    Details
    ISSN: 1573-1111
    Keywords: Dibenzo-18-crown-6 ; acetonitrile ; nitromethane ; solvent complex ; low temperature crystal structure ; C−H acidic hydrogen interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Complete structural characterization of dibenzo-18-crown-6·2 CH3NO2 and dibenzo-18-crown-6·2 CH3CN have been carried out, including location and refinement of the methyl hydrogen atoms. Dibenzo-18-crown-6·2 CH3NO2 is monoclinic,P21/c, with (at −150°C)a=9.573(2),b=14.636(2),c=33.471(7) Å, β=93.77(2)°, andD calc=1.37 g cm−3 forZ=8. Interactions between the solvent methyl groups and the crown ethers and other solvent nitro groups associate the 1 : 2 complexes into polymeric chains alongb. The acetonitrile adduct exists as discreet 1 : 2 complexes in the solid state with C−H...O interactions exlusively to the ether. This complex is triclinic,P 1, with (at −150°C)a=9.458(6),b=9.570(5),c=14.404(5) Å, α=73.18(4), β=79.85(5), γ=66.82(6)°, andD calc=1.28 g cm−3 forZ=2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00656345
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  • 7
    Electronic Resource
    Electronic Resource
    f-Element/crown ether complexes: 21. Conformational changes in metal complexed versus hydrogen bonded benzo-15-crown-5 in the structure of [Y(OH2)3(NCMe)-(benzo-15-crown-5)][ClO4]3·benzo-15-crown-5·CH3CN (1989)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 7 (1989), S. 277-287 
    Details
    ISSN: 1573-1111
    Keywords: Benzo-15-crown-5 ; yttrium perchlorate ; low temperature crystal structure ; hydrogen bonding ; complexation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Crystalline [Y(OH2)3(NCMe)(benzo-15-crown-5)][ClO4]3·benzo-15-crown-5-CH3CN can be obtained by slowly cooling a reaction mixture of Y(ClO4)3·n H2O with benzo-15-crown-5 in a solution of acetonitrile and methanol (3 : 1) from 60°C to room temperature. The crystal structure of this complex has been determined at −150 and 20°C. The complex is triclinic,P $$\bar 1$$ . At −150°C the cell parameters area = 11.986(4),b = 12.071(7),c = 16.364(5) Å, α = 93.56(3),β = 98.68(3),γ = 109.68(4)°, vol = 2187 Å3, andD calc = 1.61 g cm−3 forZ = 2 formula units. 3633 independently observed [F o ⩾ 5σ(F o)] reflections were used in the final least-squares refinement leading to an agreement index ofR = 0.048. The Y(III) ion coordination geometry approximates a tricapped trigonal prism with three water molecules and three benzo-15-crown-5 oxygen atoms forming the prism, with the two remaining benzo-15-crown-5 oxygen atoms and the acetonitrile molecule completing the coordination as capping atoms. The three water molecules hydrogen bond a second crown ether molecule and two of the perchlorate anions. The two acetonitrile molecules have contacts with perchlorate oxygen atoms close enough for some weak interaction. One perchlorate is ordered, one is partially disordered as is the coordinated solvent molecule, and the third anion is totally disordered. The two unique crown ether molecules have distinctively different conformations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01076980
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  • 8
    Electronic Resource
    Electronic Resource
    The high-molecular-weight glutenin subunit compositions of Chinese bread wheat varieties and their relationship with bread-making quality (1993)
    Springer
    Euphytica 68 (1993), S. 205-212 
    Details
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; glutenin sub-units ; bread-making quality
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The composition of the high-molecular-weight (HMW) subunits of glutenin encoded by Glu-1 in hexaploid wheat (Triticum aestivum L.) was determined for 99 varieties bred in China. Seventy-nine varieties were homogeneous for HMW glutenin subunit composition. The majority of the remainder were heterogeneous at one Glu-1 locus, with two varieties heterogeneous at two loci. One variety carried a pattern of subunits not encountered in previous studies. The majority of varieties, as in previous studies, carried subunits 7+8 or 7+9 encoded by Glu-B1. In contrast, there was a relatively high occurrence of subunits 2+12 at Glu-D1. It was shown that a high proportion, 69%, of the potential variation in bread-making quality, as assessed by SDS-sedimentation volume, was accounted for by variation in the composition of the HMW subunits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00029874
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  • 9
    Electronic Resource
    Electronic Resource
    Introduction to bread wheat (Triticum aestivum L.) and assessment for bread-making quality of alleles from T. boeoticum Boiss. ssp. thaoudar at Glu-A1 encoding two high-molecular-weight subunits of glutenin (1997)
    Springer
    Euphytica 93 (1997), S. 19-29 
    Details
    ISSN: 1573-5060
    Keywords: dough quality ; electrophoresis ; endosperm storage protein ; genetics ; gluten strength ; near isogenic line ; Triticum aestivum ; wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Two alleles, Glu-A1r encoding high-molecular-weight (HMW) glutenin subunits 39+40 and Glu-A1s encoding HMW glutenin subunits 41+42, were introgressed to bread wheat (Triticum aestivum L.) cv. Sicco from two accessions of T. boeoticum Boiss. ssp. thaoudar (A genome species, 2n=2x=14). Alleles at Glu-A1 in current commercial bread wheats encode zero or one subunit, and alleles at the homoeoloci Glu-B1 and Glu-D1 encode a maximum of two subunits; hence the maximum number of subunits found in commercial wheats is five, whereas the lines incorporating Glu-A1r and Glu-A1s carry six. Using near-isogenic lines, the current results demonstrated that the introduction of Glu-A1r resulted in diminished dough stickiness and improved stability during mixing compared with Glu-A1a encoding subunit 1, and a small improvement in gluten strength as shown by the SDS- sedimentation test. The introduction of Glu-A1a also resulted in a small improvement in gluten strength predicted by the SDS-sedimentation test. Thus the alleles are of potential value in breeding programmes designed to improve bread-making quality.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1002991206350
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