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  • 1
    Electronic Resource
    Electronic Resource
    Rheological Characterization of Synergistic Mixtures of Carrageenan and Locust Bean Gum for Aqueous Gelcasting of Alumina (2002)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 85 (2002), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Previous works have shown that carrageenan can be successfully used in the aqueous gelforming of powders, because carrageenan forms a firm gel, similar to that formed by agarose, but at a much lower cost. In this work, the synergistic effect of carrageenan with locust bean gum is studied. The rheological behavior of 2 wt% solutions of these polysaccharides and their mixtures are measured under mixing conditions (60°C) and by recording the viscosity and elastic modulus on cooling. The effect of the addition of these solutions to 50 vol% alumina slurries up to a concentration of 0.5 wt% is studied. Although gelling time increases, the resulting gels are stronger than for carrageenan alone. Gelcast alumina bodies with green and sintered densities of 57% and 97.6% of theoretical have been obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2002.tb00476.x
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  • 2
    Electronic Resource
    Electronic Resource
    Aqueous Gel-Forming of Silicon Nitride Using Carrageenans (2001)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 84 (2001), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Much effort has been devoted recently to the development of near-net-shaping processes in water. Agarose has been demonstrated to be a suitable gelling agent for aqueous forming. However, its high cost and the difficulties in controlling the rheological properties have restricted large-scale applications. In this work a novel gelling binder, namely carrageenan, is proposed as a low-cost and high-gel-strength additive for gel-forming ceramic powders. The capability to obtain silicon nitride parts by carrageenan gelation is described. Aqueous silicon nitride slips are prepared at pH 〉11 to a solids content of 70 wt% using tetramethylammonium hydroxide as a dispersant. Dissolution and gelation of carrageenan are studied by continuous measurements of viscosity with temperature for solutions prepared at different pH values. The final injection slips prepared by mixing at 〈60°C the previously heated suspension and the carrageenan solution are rheologically characterized also. After the blend is injected into cooled nonporous molds, gelling occurs in a few seconds and samples can be dried in air for 24–48 h. Green densities of 52% of theoretical are obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2001.tb00608.x
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  • 3
    Electronic Resource
    Electronic Resource
    THE PENICILLIN RECEPTOR IN STREPTOMYCES (1974)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 235 (1974), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1974.tb43269.x
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  • 4
    Electronic Resource
    Electronic Resource
    THE CHEMICAL BASIS FOR THE ACTION OF THE VANCOMYCIN GROUP OF ANTIBIOTICS (1974)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 235 (1974), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1974.tb43276.x
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  • 5
    Electronic Resource
    Electronic Resource
    Fate of Clostridium sporogenes PA 3679 in Fish Sausage Formulations with Adjusted aw using Food Binders (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 54 (1989), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Fish sausage from minced Spanish mackerel was formulated to aw of 097–0.92 using egg white solids alone and in combination with nonfat dry milk, alginate and soy protein isolate, without and with nitrite added at 150 ppm. The batter was inoculated with PA 3679 spores at ca. 105/g, chopped, stuffed in casing, cooked to a core temperature of 85°C, vacuum-packaged and stored at 25°C for 60 days. The test organism did not reproduce in formulations having aw 〈 0.95. Total counts decreased rapidly and spore counts were nil at the end of storage. Spores of PA 3679 germinated at aw as low as 0.924 but the cells failed to grow. Products with aw 〉 0.95 spoiled. Product stability was influenced by aw regardless of binder type and presence of nitrite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1989.tb05938.x
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  • 6
    Electronic Resource
    Electronic Resource
    Inorganic chemical knowledge representation using dynamic data structures (1993)
    s.l. : American Chemical Society
    Journal of chemical information and modeling 33 (1993), S. 378-384 
    Details
    ISSN: 1520-5142
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ci00013a014
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  • 7
    Electronic Resource
    Electronic Resource
    Computer translation of inorganic chemical nomenclature to a dynamic abstract data structure (1994)
    s.l. : American Chemical Society
    Journal of chemical information and modeling 34 (1994), S. 526-533 
    Details
    ISSN: 1520-5142
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ci00019a009
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  • 8
    Electronic Resource
    Electronic Resource
    Effects of boron and calcium nutrition on the establishment of the Rhizobium leguminosarum–pea (Pisum sativum) symbiosis and nodule development under salt stress (2003)
    Oxford, UK : Blackwell Science Ltd
    Plant, cell & environment 26 (2003), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The effects of modifying boron (B) and calcium (Ca2+) concentrations on the establishment and development of rhizobial symbiosis in Pisum sativum plants grown under salt stress were investigated. Salinity almost completely inhibited the nodulation of pea plants by Rhizobium leguminosarum bv. viciae 3841. This effect was prevented by addition of Ca2+ during plant growth. The capacity of root exudates derived from salt-treated plants to induce Rhizobium nod genes was not significantly decreased. However, bacterial adsorption to roots was highly inhibited in plants grown with 75 mM NaCl. Moreover, R. leguminosarum 3841 did not grow in minimal media containing such salt concentration. High Ca2+ levels enhanced both rhizobial growth and adsorption to roots, and increased nodule number in the presence of high salt. Nevertheless, the nodules developed were not functional unless the B concentration was also increased. Because B has a strong effect on infection and cell invasion, these processes were investigated by fluorescence microscopy in pea nodules harbouring a R. leguminosarum strain that expresses green fluorescent protein. Salt-stressed plants had empty nodules and only those treated with high B and high Ca2+ developed infection threads and exhibited enhanced cell and tissue invasion by Rhizobium. Overall, the results indicate that Ca2+ promotes nodulation and B nodule development leading to an increase of salt tolerance of nodulated legumes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3040.2003.00995.x
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  • 9
    Electronic Resource
    Electronic Resource
    Relationship between boron and calcium in the N2-fixing legume–rhizobia symbiosis (2003)
    Oxford, UK : Blackwell Science Ltd
    Plant, cell & environment 26 (2003), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Because boron (B) and calcium (Ca2+) seem to have a strong effect on legume nodulation and nitrogen fixation, rhizobial symbiosis with leguminous plants, grown under varying concentrations of both nutrients, was investigated. The study of early pre-infection events included the capacity of root exudates to induce nod genes, and the degree of adsorption of bacteria to the root surface. Both phenomena were inhibited by B deficiency, and increased by addition of Ca2+, resulting in an increase of the number of nodules. The infection and invasion steps were investigated by fluorescence microscopy in pea nodules harbouring a Rhizobium leguminosarum strain that constitutively expresses green fluorescent protein. High Ca2+ enhanced cell and tissue invasion by Rhizobium, which was highly inhibited after B deficiency. This was combined with an increased B concentration in nodules of plants grown on B-free medium and supplemented with high Ca2+ concentrations, and that can be attributed to an increased B import to the nodules. Histological examination of indeterminate (pea) and determinate (bean) nodules showed an altered nodule anatomy at low B content of the tissue. The moderate increase in nodular B due to additional Ca2+ was not sufficient to prevent the abnormal cell wall structure and the aberrant distribution of pectin polysaccharides in B-deficient treatments. Overall results indicate that the development of the symbiosis depends of the concentration of B and Ca2+, and that both nutrients are essential for nodule structure and function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3040.2003.01107.x
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  • 10
    Electronic Resource
    Electronic Resource
    Isolement de la lanuginosine a partir d'une annonacee malgache, Xylopia lemurica
    Amsterdam : Elsevier
    Phytochemistry 14 (1975), S. 2508-2509 
    Details
    ISSN: 0031-9422
    Keywords: 9-methoxyliriodenine. ; Annonaceae ; Xylopia lemurica ; lanuginosine ; oxoaporphine alkaloids
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0031-9422(75)80378-5
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