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  • Articles: DFG German National Licenses  (16)
  • 1990-1994  (16)
  • Chemistry  (12)
  • Triticum aestivum  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Characterization of variability and relationships among components of partial resistance to leaf rust in CIMMYT bread wheats (1991)
    Springer
    Theoretical and applied genetics 82 (1991), S. 674-680 
    Details
    ISSN: 1432-2242
    Keywords: Puccinia recondita tritici ; Triticum aestivum ; Rust resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A study of spring bread wheat (Triticum aestivum) germ plasm developed at the International Maize and Wheat Improvement Center (CIMMYT) showed highly significant phenotypic variability for each component of partial resistance (namely, uredial appearance period, latency period, uredial number and uredial size) to Puccinia recondita f. sp. tritici. All of the wheat genotypes displayed longer uredial appearance and latency periods and decreased uredial number and uredial size when compared to the susceptible check cultivar ‘Morocco’. Positive correlations between uredial appearance period and latency period, and uredial number and uredial size, and negative correlations between uredial appearance and latency periods and uredial number and uredial size, inclusive, suggested that the components of partial resistance were either tightly linked or under pleiotropic genetic control. Compared to ‘Morocco’, all entries had slow disease progress in the field and variation occurred in the germ plasm for the area under the leaf rust progress curve. Disease progress was negatively correlated with uredial appearance and latency periods, whereas a positive correlation was observed with uredial number and uredial size. Certain genotypes displayed high levels of partial resistance resulting in low disease incidence in the field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00227310
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Associations and genetics of three components of slow rusting in leaf rust of wheat (1993)
    Springer
    Euphytica 68 (1993), S. 99-109 
    Details
    ISSN: 1573-5060
    Keywords: wheat ; Puccinia recondita f.sp. tritici ; Triticum aestivum ; slow rusting resistance ; leaf rust ; brown rust ; genetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Forty F6 lines, the two parental lines, and a susceptible check cultivar of wheat (Triticum aestivum L.) were inoculated in the young flag leaf stage with leaf rust (Puccinia recondita f.sp. tritici) and evaluated for latent period, receptivity, and uredinium size in a greenhouse experiment. Genotypic (rg) and phenotypic (rp) correlations between latent period and uredinium size were −0.81 and −0.62, respectively. A negative correlation (rg=−0.50, rp=−0.41) was found between latent period and receptivity and a positive correlation (rg=0.28, rp=0.26) between uredinium size and receptivity was found. Area under the disease progress curve (AUDPC) and final rust severity (FRS) obtained from a subsequent field study with common entries were negatively correlated with latent period and positively correlated with uredinium size. Correlations of receptivity with both AUDPC and FRS were not significant. The distributions of F6 family mean uredinia size and latent period were continuous between slow rusting and fast rusting parents: however, the distribution for receptivity was discrete. Narrow-sense heritability estimates were 63%, 57%, and 47% for uredinium size, latent period, and receptivity, respectively. Estimates of the minimum number of effective factors were three for latent period and three or four for the uredinium size and receptivity. The components are controlled by closely linked genes or due to pleotropic effects of the same gene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00024159
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  • 3
    Electronic Resource
    Electronic Resource
    Genes for leaf rust resistance in Indian and Pakistani wheats tested with Mexican pathotypes of Puccinia recondita f.sp. tritici (1991)
    Springer
    Euphytica 57 (1991), S. 27-36 
    Details
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; Puccinia recondita tritici ; leaf rust ; rust resistance ; slow rusting
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Genes conferring low seedling reaction to Mexican pathotypes of Puccinia recondita f. sp. tritici in 71 bread wheat (Triticum aestivum L.) cultivars from India and Pakistan were postulated. In total, 9 known and one unknown genes were identified, either singly or in combination: Lr1 (in 20 cultivars), Lr3 (5), Lr10 (21), Lr11 (1), Lr13 (43), Lr17 (5), Lr23 (14), Lr26 (2), Lr27 + Lr31 (2), and the unknown gene in 2 cultivars. Additional temperature-sensitive seedling resistance appeared to occur in 27 cultivars. This resistance in at least 15 cultivars appeared to be due to Lr34. Area under the disease progress curve (AUDPC) for these 27 cultivars indicated variable levels of adult plant resistance. Several other cultivars with high seedling infection types to one or more of the predominant field pathotypes were also partially resistant in the field. High levels of adult plant resistance occurred in some cultivars even in the absence of known seedling resistance genes with major effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00040475
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  • 4
    Electronic Resource
    Electronic Resource
    Genetics of resistance toPuccinia graminis tritici andPuccinia recondite tritici in four South African wheats (1990)
    Springer
    Theoretical and applied genetics 79 (1990), S. 401-410 
    Details
    ISSN: 1432-2242
    Keywords: Puccinia graminis tritici ; Puccinia recondita Tritici ; Triticum aestivum ; Rust resistance ; Gene identification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Genes for resistance toPuccinia graminis tritici andPuccinia recondita tritici identified in four South African wheats were:Sr6,Sr8a,Sr9e, andLr13 in ‘W3762’;Sr5,Sr8a,Sr9b,Sr12,Sr24,Lr13, andLr24 in ‘W3760’;Sr2,Sr24,SrC,Lr13, andLr24 in ‘W3751’; andSr7a,Sr23,Sr36, andLr16 in ‘W3755’. GenesSr2,Sr9e, andSr24 also conferred adult plant resistance to the predominant pathotypes ofP. graminis tritici. GenesSr7a,Sr23, andSrC, when present alone, did not confer acceptable adult plant resistance, even though low seedling reactions were associated with them when tested with the same pathotypes. Genetic recombination betweenLr13 andSr9e was estimated at 12.5%±2.3%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01186086
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Photo- and thermoinitiated oxidation of high-impact polystyrene.N.C.L. Communication No. 5688. I. Characterization by FT-IR spectroscopy (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 32 (1994), S. 485-493 
    Details
    ISSN: 0887-624X
    Keywords: photooxidation ; thermal-oxidation, high-impact ; polystyrene ; FT-IR spectroscopy ; derivatization reaction ; oxidation profile ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The photo- and thermooxidative degradation of different grades of high-impact polystyrene (HIPS) has been studied by FT-IR spectroscopy. The oxidized films were treated with NH3 and SF4 for the rapid identification and resolution of the various carbonyl species, alcohols, and hydroperoxides. All the sample gave similar oxidation products, but in varying quantities. The heterogenity in the film was also determined by micro-FT-IR spectroscopy. The thermal degradation processes at different temperature were compared. © 1994 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1994.080320310
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  • 6
    Electronic Resource
    Electronic Resource
    Miscibility and interaction studies on some aqueous polymer blend solutions by ultrasonic and rheological techniques (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 51 (1994), S. 1559-1565 
    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: The aqueous solutions of poly(ethylene oxide)-polyacrylic acid, poly(vinyl pyrrolidone)-poly(vinyl alcohol), and poly(ethylene oxide)-poly(vinyl alcohol) blends have been studied by ultrasonic, rheological, and viscometric techniques. Extensive investigation over a wide range of concentrations, temperatures, compositions, pH, and shear rates indicate the degree of miscibility, extent of interaction between the polymers, and stoichiometry of the polymer complexes formed by the strong interaction between the polymers in solutions. These investigations indicate the miscibility of poly(ethylene oxide)-polyacrylic acid and poly(ethylene oxide)-poly(vinyl pyrrolidone) blends and the immiscibility of poly(ethylene oxide)-poly(vinyl alcohol) blends in conformity with other reported investigations. © 1994 John Wiley & Sons, Inc.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1994.070510905
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  • 7
    Electronic Resource
    Electronic Resource
    Studies on impact modification of polystyrene (PS) by ethylene-propylene-diene (EPDM) rubber and its graft copolymers. I. PS/EPDM and PS/EPDM-g-styrene blends (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 40 (1990), S. 685-692 
    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: Ethylene-propylene-diene (EPDM) rubber is an excellent rubber for outdoor use. High impact polystyrene (PS) containing EPDM rubber may show improved weathering resistance. PS is incompatible with EPDM; hence bulk polymerization technique is adopted for the synthesis of graft products which show limited compatibility with PS. Two initiators were chosen at two different working temperatures to produce high grafting efficiency and grafting percentage. In the present system, it is shown that the graft copolymer and polystyrene compositions show higher improved impact strength behavior than that of the products based upon simple dispersion of EPDM in polystyrene.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1990.070400505
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  • 8
    Electronic Resource
    Electronic Resource
    Studies on impact modification of polystyrene (PS) by ethylene-propylene-diene (EPDM) rubber and its graft copolymers. III. PS/EPDM-g-(styrene-co-maleic anhydride) blends and its relative performance (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 40 (1990), S. 701-707 
    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: The graft copolymer of ethylene-propylene-diene (5-ethylidene-2-norbornene) rubber with styrene and maleic anhydride is synthesized, characterized, and blended with polystyrene. The tensile and the impact behaviors of the blends were investigated. The relative performance of EPDM-g-(styrene-co-maleic anhydride) as impact modifier for polystyrene has been evaluated.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1990.070400507
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  • 9
    Electronic Resource
    Electronic Resource
    Drag-reduction efficiency, shear stability, and biodegradation resistance of carboxymethyl cellulose-based and starch-based graft copolymers (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 43 (1991), S. 1091-1101 
    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: Graft copolymers of carboxymethyl cellulose and starch with polyacrylamide have been synthesized by grafting acrylamide onto carboxymethyl cellulose and starch, respectively, using a ceric-ion-initiated solution polymerization technique. These graft copolymers have been tested for their drag-reduction effectiveness, shear stability, and biodegradability. It has been shown that grafting enhances the drag-reduction effectiveness and shear stability and also that these factors are very much dependent on the length and number of grafts in the molecule. None of the graft copolymer solutions shows any microbial degradation up to 10 days.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1991.070430609
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  • 10
    Electronic Resource
    Electronic Resource
    Studies on impact modification of polystyrene (PS) by ethylene-propylene-diene (EPDM) rubber and its graft copolymers. II. PS/EPDM-g-(styrene-co-methylmethacrylate) blends (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 40 (1990), S. 693-699 
    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: The toughness of a polymer blend is one of the major factors deciding its practical application. An impact modified polystyrene (PS) is usually a multiphase system consisting of the thermoplastics and an elastomeric component. The heterogeneous character of such a system and the interfacial adhesion between the components determine its impact strength. The graft copolymer of ethlene-propylene-diene (5-ethylidene-2-norbornene) rubber with styrene and methylmethacrylate is synthesized, characterized, and blended with polystyrene to improve its impact strength. It is observed that there is improvement in impact strength with the subsequent decrease of tensile strength. The improved impact strength has been discussed in terms of morphology, compatibility, and interfacial adhesion of graft copolymers with PS matrix.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1990.070400506
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